Chemiexcitation: Mammalian Photochemistry in the Dark†

May combine two claims.

The excited carbonyl transfers its energy to nearby DNA without photons, producing the lethal and mutagenic CPD.

“with the excited carbonyl transferring its energy to nearby DNA, without photons, to make the lethal and mutagenic cyclobutane pyrimidine dimer”

• cites [33] sourcePartly supported

  Section 4, “CPDs from chemiexcitation” (page not provided), describes photon-independent energy transfer from an excited carbonyl to DNA as a proposed route to CPDs. It explicitly says the final steps have not been demonstrated directly, so the claim presents the mechanism more definitively than the source does. The Introduction identifies CPDs as lethal and mutagenic. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

In the first step of that reaction, brief UV exposure activates NOS and NOX to generate nitric oxide and superoxide for hours afterward; the induction mechanism is unknown.

“a brief UV exposure activates the enzymes nitric oxide synthase (NOS) and NADPH oxidase (NOX) to generate the radicals nitric oxide (•NO) and superoxide (O2•−) for hours afterward; the mechanism of induction is still not known.”

• cites [32] sourcePartly supported

  The Photochemical Pathway section says NOX and iNOS are UV-inducible within minutes and identifies them as sources of superoxide and nitric oxide; the Proposed Scheme describes prolonged UV induction of both enzymes. The paper does not establish that both radicals are generated for hours after exposure. It says the specific isozymes remain unidentified, but does not explicitly say that the mechanism of enzyme induction is unknown. Page numbers are unavailable in our copy. (LLM, conf=0.82)

  Experimental — accuracy not yet measured
• cites [33] sourcePartly supported

  The Abstract describes UV activation of NOS and NOX and their generation of nitric oxide and superoxide. Section 4 says the enzymes are UV-inducible within minutes, while Section 5 describes prolonged UV induction that helps account for delayed CPD formation. Our copy does not state that the mechanism of enzyme induction is unknown. (LLM, conf=0.85)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Chemiexcitation was once thought energetically impossible in biological systems but is now known to underlie jellyfish and firefly bioluminescence.

“Once thought to be energetically impossible in a biological system, this physical chemistry process is now known to underlie the bioluminescence of jellyfish and fireflies”

• cites [19] sourceNot checked — no full text of the source
• cites [20] sourcePartly supported

  The FIREFLY AND COELENTERAZINE section describes a shared chemical-excitation mechanism for firefly bioluminescence and coelenterazine, which the paper also identifies in jellyfish aequorin. The BACKGROUND section discusses an earlier belief that light emission must be accompanied by heat, but does not say chemiexcitation was once thought energetically impossible in biological systems. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

The Ullrich/Cadenas/Sies group found that heme enzymes cytochrome P450 and cyclooxygenase generate red luminescence attributable to O2 excited by energy transfer from triplet-state enzyme products.

“the Ullrich/Cadenas/Sies group found that the heme enzymes cytochrome P450 and cyclooxygenase generate red luminescence attributable to O2 excited by energy transfer from triplet-state enzyme products”

• cites [25] sourcePartly supported

  The section on iodosobenzene-induced chemiluminescence reports red-region emission from cytochrome P-450 systems and identifies part of it as singlet-oxygen dimol emission. The paper does not report cyclooxygenase producing that light or attribute the oxygen excitation to energy transfer from triplet-state enzyme products; its proposed mechanism instead involves an active oxygen complex reacting with an oxene donor. (LLM, conf=0.88)

  Experimental — accuracy not yet measured
• cites [26] sourceNot checked — no full text of the source

May combine two claims.

In the second step, melanin or its precursor monomer is oxidized to a radical; based on analogous reactions, ambient O2 is proposed to add and form a peroxyl radical that cyclizes into a dioxetane.

“Based on analogous reactions in the literature, it is proposed that ambient O2 adds to create a peroxyl radical, which then cyclizes to create a strained 4-atom ring containing C–O–O–C, termed a dioxetane”

• cites [32] sourcePartly supported

  The Photochemical Pathway section describes dioxetane as a strained four-membered ring peroxide, and the Proposed Scheme section speculates that a peroxynitrite–melanin reaction produces a dioxetane intermediate (page numbers unavailable). Neither passage proposes the specific sequence in which ambient O₂ adds to form a peroxyl radical that then cyclizes. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

May combine two claims.

A dioxetane can instead be cleaved by introducing an electron from a fluoride ion (CIEEL), in which case excitation is to the singlet state.

“The dioxetane can instead be cleaved by introducing an electron from, e.g., a fluoride ion (chemically initiated electron exchange luminescence, CIEEL); in this case, excitation is to the singlet state”

• cites [52] sourceCould not verify

  Section 1 (p. 613) describes EPR measurements of DOPA-melanin, and Section 3.2 discusses its thermally excited triplet states. Neither addresses dioxetane cleavage, electron donation by fluoride, CIEEL, or the claimed singlet-state excitation; searches for those terms found no relevant passage in our copy. (LLM, conf=0.78)

  Experimental — accuracy not yet measured
• cites [53] sourceNot checked — no full text of the source

May combine two claims.

When dioxetane is formed by addition of singlet oxygen, no spin barrier exists and no radical is needed, but an electron-rich bond is required.

“When the dioxetane is formed by addition of singlet oxygen (O=O*), there is no spin barrier to surmount and no radical is needed but an electron-rich bond is (60).”

• cites [60] sourceCould not verify

  The Discussion (page unavailable) proposes dioxetane formation after a melatonin radical reacts with superoxide, not after singlet-oxygen addition. Our copy does not address whether singlet-oxygen addition avoids a spin barrier or radicals, or requires an electron-rich bond (searched: dioxetane, spin barrier, electron-rich bond). The paper’s different proposed pathway does not establish the opposite for the conditional pathway in the claim. (LLM, conf=0.75)

  Experimental — accuracy not yet measured

May combine two claims.

Eumelanin consists of hydroquinone, semiquinone, and quinone subunits with different redox states, producing a range of HOMO-LUMO separations and light absorbance peaks.

“Eumelanin, the melanin of dark hair and skin, consists of a variety of hydroquinone, semiquinone, and quinone subunits having different redox states and thus a range of HOMO-LUMO separations, giving a range of light absorbance peaks (87, 88).”

• cites [87] sourcePartly supported

  Section 2 (page unavailable) describes reduced chromophoric components coexisting with quinonoid units and reports different UV and visible absorption bands in eumelanins. It does not identify hydroquinone and semiquinone subunits or attribute the absorption range to differing HOMO–LUMO separations. (LLM, conf=0.85)

  Experimental — accuracy not yet measured
• cites [88] sourcePartly supported

  The Introduction (page unavailable) describes eumelanin as containing various redox forms of DHI and DHICA, and the Results and discussion mention quinone and semiquinone forms. The Conclusions (page unavailable) link a range of HOMO–LUMO gaps to broadband absorption, but attribute the calculated range specifically to different DHICA oligomer bonding configurations. The paper does not establish that differences in redox state among the three named subunits are what produce that range. (LLM, conf=0.84)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Melanin is an exotic polymer whose structure is uncertain but appears to be a stack of planar aromatic oligomers.

“Melanin is an exotic polymer (82–86). Its structure is not certain, but it appears to be a stack of planar aromatic oligomers.”

• cites [82] sourceNot checked — no full text of the source
• cites [83] sourceNot checked — no full text of the source
• cites [84] sourcePartly supported

  The paper says eumelanin’s structure is not established and describes small oligomers stacked in planar arrangements (Structural Model of Eumelanin, p. 2). It also models stacked planar tetramers (p. 4). The claim extends that structural description to melanin generally, whereas the paper distinguishes eumelanin from other forms and does not establish the same structure for them. (LLM, conf=0.83)

  Experimental — accuracy not yet measured
• cites [85] sourceNot checked — no full text of the source
• cites [86] sourceNot checked — no full text of the source

May combine two claims.

These quenchers fell into three broad activity levels, with the most active dissipating energy by isomerization.

“These fell into three broad levels of activity, with the most active dissipating the energy by isomerization.”

• cites [40] sourcePartly supported

  Results §3.2 divides the compounds into three activity groups, with Group I the most active. Discussion §§4.2 and 4.7 propose isomerization as a way Group I dissipates triplet energy, but §4.7 says direct confirmation of the mechanism is still needed. The claim presents that proposed mechanism as established. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Vitamin E is now known to also act as a triplet-state quencher.

“Vitamin E is now known to also act as a triplet-state quencher”

• cites [40] sourceSupported

May combine two claims.

The chemiexcitation events were discovered in melanocyte cell cultures and murine skin using a fluorescent triplet-state reporter, blocking with vitamin E or sorbate, and identifying dCPDs by mass spectrometry and immunohistochemistry.

“The chemiexcitation events were discovered in melanocyte cell cultures and in murine skin, using a fluorescent triplet-state reporter to detect the transient triplet state, blocking these events with the radical scavenger vitamin E or the triplet-specific quencher sorbate, and identifying dCPDs using mass spectrometry and immunohistochemistry.”

• cites [32] sourcePartly supported

  The Delayed Cyclobutane Pyrimidine Dimer Induction section reports dark CPDs in cultured melanocytes and mouse epidermis, while the Photochemical Pathway section describes a luminescent triplet-energy reporter and says vitamin E abolished dark-CPD production. The Cytosine-containing Dark CPD section confirms identification by mass spectrometry. The available passages describe immunofluorescence rather than immunohistochemistry and do not establish that sorbate blocked the events; the Electronically Excited Melanin section says sorbate could not be tested in its cell-free reaction. (LLM, conf=0.78)

  Experimental — accuracy not yet measured
• cites [33] sourcePartly supported

  Section 2, “CPDs in the dark” (page unavailable), describes delayed CPDs in cultured melanocytes and mouse epidermis and identifies CPDs by mass spectrometry. Section 4, “CPDs from chemiexcitation” (page unavailable), describes the DBAS fluorescent triplet-state reporter and prevention of delayed CPDs by vitamin E or ethyl sorbate. Our copy describes an anti-CPD antibody ELISA, but the passages found do not establish the claimed use of immunohistochemistry. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

The pyrrole ring was implicated as a site of dioxetane formation, and the catechol ring of eumelanin has also been proposed as a site for dioxetane formation.

“The pyrrole ring was implicated as the site of a dioxetane (Fig. 4c) (32); the catechol ring of eumelanin has also been proposed as a site for dioxetane formation (43).”

• cites [32] sourceSupported
• cites [43]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

Semiquinones facilitate charge transfer and form charge-transfer complexes that tightly bind drugs that are facile electron donors.

“The semiquinones also facilitate charge transfer and form charge-transfer complexes that tightly bind drugs which are facile electron donors (100–102).”

• cites [100] sourceCould not verify

  The Introduction (page unavailable) discusses semiquinones in melanin’s hydration-dependent reactions, and the Conclusion links them to protonic conductivity. Neither passage addresses charge-transfer complexes or tight binding of electron-donating drugs; searches for those terms found no supporting passage in our copy. (LLM, conf=0.75)

  Experimental — accuracy not yet measured
• cites [101]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites [102] sourceNot checked — no full text of the source

May combine two claims.

Diketones such as acetoacetate and malonaldehyde can host a dioxetane, and their adjacent carbonyls form a π electron system able to conduct one-electron transfers.

“Diketones such as acetoacetate, a normal product of energy metabolism but present in excess in type 1 diabetes, and malonaldehyde, a product of arachidonic acid metabolism or lipid peroxidation, can host a dioxetane. The adjacent carbonyls form a π electron system able to conduct 1-electron transfers (122).”

• cites [122] sourceCould not verify

  The Materials and Methods and Results and Discussion passages describe the preparation and characterization of A2E and iso-A2E, not diketones hosting dioxetanes. Searches for acetoacetate, malonaldehyde, dioxetane, and one-electron transfer found no passage addressing the attributed claim. Page numbers were not available in our copy. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

May combine two claims.

Eumelanin's 5,6-indolequinones have a very low LUMO and readily accept electrons; a dimer has such a low LUMO that its excited state is bonding rather than antibonding.

“Eumelanin’s 5,6-indolequinones have a very low energy LUMO, which therefore readily accepts electrons from other molecules; a dimer of these has such a low LUMO that the excited state is a bonding orbital instead of antibonding (90).”

• cites [90] sourcePartly supported

  The Discussion (page unavailable) proposes charge transfer between reduced and oxidized indolic units and describes an ultrafast reaction in a catechol–quinone heterodimer, offering limited support for electron transfer involving quinones. It does not report a low LUMO for 5,6-indolequinones or say that a dimer’s excited state occupies a bonding rather than antibonding orbital. (LLM, conf=0.78)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

FRET works only for singlets, and Dexter transfer differs from Förster in that the Dexter acceptor's energy should be lower than the donor's rather than equal.

“Förster resonance energy transfer (FRET) is a different process that works only for singlets. Dexter transfer also differs from Förster in that the Dexter acceptor’s energy should be lower than the donor’s, rather than equal (125).”

• cites [125] sourceCould not verify

  The closest passage, in “Measuring and manipulating 'ROS'” (p. 15), mentions a chemiluminescence resonance-energy-transfer nanoprobe but does not discuss Förster or Dexter transfer. Searches for FRET, singlets, Dexter transfer, and donor–acceptor energy requirements found no passage in our copy addressing the claim. (LLM, conf=0.75)

  Experimental — accuracy not yet measured

May combine two claims.

The LUMO of the semiquinone multimer is only slightly higher than the HOMO, so little energy is needed to excite an electron from HOMO to LUMO.

“The LUMO is only slightly higher than the HOMO, so the semiquinone multimer requires little energy for an electron to be excited from HOMO to LUMO (90).”

• cites [90] sourceCould not verify

  The Discussion (page unavailable) discusses how chromophore size and coupling may affect electronic transition energies, and mentions semiquinone as a functional group. It does not address a semiquinone multimer’s HOMO–LUMO gap or say that little energy is needed for that excitation. Searches for HOMO/LUMO and for a semiquinone oligomer’s energy gap found no such passage. (LLM, conf=0.74)

  Experimental — accuracy not yet measured

May combine two claims.

Eumelanin is a strong light absorber from UV to infrared, and its absorbed energy is dissipated vibrationally in the same way in each subunit.

“As a result, eumelanin is a strong light absorber from UV to infrared. The energy is then dissipated vibrationally the same way in each subunit (89).”

• cites [89] sourcePartly supported

  The Introduction says eumelanin absorbs UV, visible and near-infrared light and dissipates the energy as heat. The Conclusions and outlook report a common electronic deactivation mechanism across the chromophores studied, but do not say that energy is dissipated vibrationally in the same way in each subunit; the Results and discussion instead propose charge-transfer excitons and recombination. (LLM, conf=0.88)

  Experimental — accuracy not yet measured

May combine two claims.

A proposed melanin structure contains an inner ring of four N atoms each separated by three C atoms, resembling porphyrin, and there is evidence melanin can transduce energy.

“A proposed structure contains an inner ring of four N atoms each separated by three C atoms, resembling porphyrin, and there is evidence that melanin can transduce energy (83, 105, 106).”

• cites [83] sourceNot checked — no full text of the source
• cites [105] sourceCould not verify

  The Introduction and Section 4 say melanin’s molecular structure is not known and describe its building blocks, but do not describe the proposed four-nitrogen ring or a resemblance to porphyrin. Section 5 discusses photochemical free-radical production, not energy transduction. Searches for the ring arrangement, porphyrin, and energy transduction found no passage addressing either claim. (LLM, conf=0.73)

  Experimental — accuracy not yet measured
• cites [106] sourcePartly supported

  The Results and discussion section (page unavailable) describes a proposed inner ring with four N atoms, each separated by three covalently bonded C atoms, in an arrangement similar to porphyrin. The paper examines optical absorption, but the passages found do not establish the separate claim that melanin can transduce energy. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Neuromelanins are found in the brain's premotor cortex, cerebellum, putamen, substantia nigra, locus coeruleus, dorsal nucleus of the vagus, and raphe nuclei.

“They are found in the brain’s premotor cortex, cerebellum, putamen, substantia nigra, locus coeruleus, dorsal nucleus of the vagus, and raphe nuclei (114).”

• cites [114] sourcePartly supported

  The Introduction identifies the substantia nigra and locus coeruleus, and “Synthesis and Accumulation of NMs in Neurons During Aging” reports neuromelanins in the putamen, premotor cortex, and cerebellum. The passages do not establish their presence in the dorsal nucleus of the vagus or raphe nuclei; page numbers are unavailable in our copy. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

May combine two claims.

Eumelanin dissipates energy as heat/phonons, and its electron-to-phonon coupling is so strong that energy from excited electrons is dissipated at least 10^6-fold faster as heat than by emitting light.

“Euelanin’s energy is dissipated as heat, i.e., phonons (quantized vibrations). Its electron→phonon coupling is so strong that energy from excited electrons is dissipated ≥106 fold faster as heat than by emitting light (107).”

• cites [107] sourceCould not verify

  The Results section reports changes in melanin’s electron-transfer activity after exposure to radiation, light, and heat; the Discussion describes photon scattering and energy transfer to electrons. Neither passage addresses energy dissipation as phonons or compares heat dissipation with light emission at a ≥10^6-fold rate (searched: phonons, electron–phonon coupling, excited electrons, and fluorescence). (LLM, conf=0.76)

  Experimental — accuracy not yet measured

May combine two claims.

Glutamate induces •NO in neurons and is released during ischemia-reperfusion such as stroke or sleep apnea, which are accompanied by ONOO-.

“The endogenous excitotoxin glutamate also induces •NO in neurons (216) and is released during ischemia-reperfusion such as in stroke or sleep apnea, which are accompanied by ONOO– (34).”

• cites [216] sourceCould not verify

  The Results section on oxidative stress discusses dopamine-derived oxidation and neuronal MHC-I expression, not glutamate release during ischemia-reperfusion or ONOO− in stroke or sleep apnea. Searches for those terms and for nitric oxide found no passage addressing the point attributed to this source; the glutamate-induced •NO clause carries a different citation. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [34] sourcePartly supported

  The section on stroke and reperfusion injury says cerebral ischemia causes extracellular glutamate to accumulate. The section on peroxynitrite in stroke describes peroxynitrite formation during ischemia and reperfusion. The passages support the stroke example, but do not establish the claim about sleep apnea. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

Cockayne syndrome, with nucleotide excision repair deficiency limited to actively transcribed genes and a mild oxidative damage repair effect, also includes hearing loss with hair cell and spiral ganglion death.

“Cockayne syndrome, with a deficiency in nucleotide excision repair limited to actively transcribed genes (plus a mild effect on repair of oxidative damage (198)), also features hearing loss with death of hair cells and the spiral ganglion (175, 199).”

• cites [175] sourceCould not verify

  The Introduction and Discussion address retinal lipofuscin and enzymatic degradation of A2E, not Cockayne syndrome. Searches for Cockayne syndrome, hearing loss, hair-cell and spiral-ganglion death, and the specified DNA-repair deficiencies found no relevant passage in our copy. (LLM, conf=0.75)

  Experimental — accuracy not yet measured
• cites [199] sourceNot checked — no full text of the source

May combine two claims.

In humans, low eumelanin indicated by light eye color and skin sunlight sensitivity correlates with less inner ear melanin, more temporary hearing loss after loud sounds, and noise-induced deafness.

“A human marker for low eumelanin (light eye color) and sunlight sensitivity of skin correlate with reduced inner ear melanin, greater temporary hearing loss after loud sounds, and noise-induced deafness (188, 184, 189, 190).”

• cites [188] sourcePartly supported

  The Discussion reports hearing loss after depletion of inner-ear melanocyte-like cells in mice, supporting a general connection between these cells and hearing. It does not report human correlations involving eye color, sunlight sensitivity, inner-ear melanin, temporary hearing loss after loud sounds, or noise-induced deafness (pages unavailable in our copy). (LLM, conf=0.77)

  Experimental — accuracy not yet measured
• cites [184] sourceNot checked — no full text of the source
• cites [189]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites [190] sourceNot checked — no full text of the source

May combine two claims.

Xeroderma pigmentosum patients have profound hearing loss without intense sound, with atrophy of the stria vascularis, organ of Corti, and spiral ganglion.

“Surprisingly, xeroderma pigmentosum patients were found to have profound hearing loss in the absence of intense sound, with atrophy of the stria vascularis, organ of Corti, and spiral ganglion (196, 197).”

• cites [196] sourceNot checked — no full text of the source
• cites [197] sourcePartly supported

  The Results report severe bilateral progressive hearing loss in one patient with xeroderma pigmentosum-type neurological degeneration, alongside atrophy of the organ of Corti, stria vascularis, and cochlear neurons. They do not establish that these findings characterize xeroderma pigmentosum patients generally or document that this patient's hearing loss occurred without intense sound exposure. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

May combine two claims.

Certain antibiotics, DNA-crosslinking anticancer drugs, or intense sound trigger •NO, O2•−, and ONOO- plus strial blood flow reduction, melanocyte detachment, loss of endolymphatic potential, elevated melanogenesis, Cox-2, and prostaglandins, killing strial melanocytes and hair cells for days and causing deafness.

“Certain antibiotics, DNA-crosslinking anti-cancer drugs, or intense sound trigger •NO, O2•−, and ONOO– as well as reduction in strial blood flow, detachment of melanocytes from capillaries, loss of the endolymphatic potential, elevated melanogenesis, Cox-2, and prostaglandins – killing strial melanocytes and hair cells for days afterward and resulting in deafness (185, 179–183, 194, 195).”

• cites [185] sourceNot checked — no full text of the source
• cites [179] sourceNot checked — no full text of the source
• cites [180] sourceNot checked — no full text of the source
• cites [181] sourceNot checked — no full text of the source
• cites [182] sourceNot checked — no full text of the source
• cites [183] sourcePartly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured
• cites [194] sourcePartly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  Experimental — accuracy not yet measured
• cites [195] sourceNot checked — no full text of the source

May combine two claims.

Microglia are abundant in the substantia nigra of Parkinson's disease patients and, when activated by local neurodegeneration, produce O2•−, •NO, ONOO-, and pro-inflammatory cytokines that kill more neurons.

“Microglia, the resident innate immune cells of the brain, are abundant in the substantia nigra of PD patients and when activated by local neurodegeneration they generate bursts of O2•−, •NO, ONOO–, and pro-inflammatory cytokines that kill additional neurons (209–213).”

• cites [209] sourceNot checked — no full text of the source
• cites [210] sourcePartly supported

  The ‘Pathological dynamics of activated microglia in pathogenesis of PD’ section reports focal accumulation of activated microglia in the substantia nigra of PD brains. The Conclusion’s Figure 3 describes a cycle in which neuronal degeneration activates microglia, whose superoxide, NO and pro-inflammatory cytokines contribute to further neuronal loss. Our copy does not identify ONOO− (peroxynitrite) among the substances they produce; the damaging cycle is presented as a model, not demonstrated in PD patients. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [211] sourceNot checked — no full text of the source
• cites [212] sourcePartly supported

  The section ‘Evidence that neuroinflammation compromises dopaminergic neuron survival’ (page unavailable) describes activated microglia producing cytokines and reactive oxygen and nitrogen species, and says dying neurons may recruit more microglia whose respiratory bursts could increase oxidative stress. It also describes the midbrain as microglia-rich. But it does not establish that the listed species are all released by microglia in PD patients or that this process definitively kills additional neurons; it presents that outcome as a possible contribution to cell death. (LLM, conf=0.87)

  Experimental — accuracy not yet measured
• cites [213] sourcePartly supported

  The Introduction reports microgliosis in Parkinson’s disease, and the Discussion says the substantia nigra has the brain’s highest microglial density. The Results show that neuromelanin activates microglia to produce superoxide, nitric oxide, and inflammatory factors, promoting neuronal damage. The Discussion mentions peroxynitrite as a cytotoxic agent but does not show that activated microglia produce it; the experiments also do not directly establish the full sequence in patients. (LLM, conf=0.86)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

The prevailing paradigm relates Parkinson's disease to intraneuronal Lewy bodies containing α-synuclein aggregates that escaped normal degradation or autophagy.

“The prevailing paradigm is that PD is related to intraneuronal Lewy bodies containing α-synuclein aggregates that escaped normal degradation or autophagy (200, 203, 204).”

• cites [200] sourceCould not verify

  The Discussion addresses unrepaired DNA damage and cochlear hair-cell death in Cockayne syndrome mouse models, not Parkinson’s disease. Searches of our untruncated copy for Parkinson’s disease, Lewy bodies, α-synuclein, and autophagy found no passage addressing the cited claim. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [203] sourceNot checked — no full text of the source
• cites [204]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

Neuromelanin released by degenerating neurons is a potent microglial activator that induces neuroinflammation and neurodegeneration.

“A potent activator of microglia is neuromelanin released by degenerating neurons, inducing neuroinflammation and neurodegeneration (114, 212).”

• cites [114] sourceSupported
• cites [212] sourcePartly supported

  The section “Evidence that neuroinflammation compromises dopaminergic neuron survival” describes a cycle in which activated microglia promote inflammation and may contribute to neuronal death. It also says dying neurons may release chemoattractants that draw activated microglia. But the copy does not identify neuromelanin as the released substance or establish it as a potent microglial activator (searched: neuromelanin). (LLM, conf=0.78)

  Experimental — accuracy not yet measured

May combine two claims.

Neuronal presentation of α-synuclein fragments activates T cells that attack neurons, inducing autoimmune neurodegeneration.

“Neuronal presentation of α-synuclein fragments activates T cells which then attack neurons, thereby inducing an autoimmune process of neurodegeneration (215).”

• cites [215] sourcePartly supported

  In ‘Influence of oxidative modifications on the toxicity of ASYN’ (p. 8), the paper says nitrated α-synuclein activates effector T cells that contribute to dopaminergic neuron degeneration. It does not say neurons present α-synuclein fragments to those T cells or that the T cells directly attack neurons; those steps in the claimed mechanism are unsupported. (LLM, conf=0.88)

  Experimental — accuracy not yet measured

Probably not a substantial claim: may not pass S3 (load-bearing).

Parkinson's disease movement disorders result from loss of neurons in the ventrolateral tier of the dopamine-releasing pars compacta of the substantia nigra.

“The movement disorders in Parkinson’s (PD) are due to loss of neurons in a specific region of the midbrain’s substantia nigra: the ventrolateral tier of the dopamine-releasing pars compacta.”

• cites [200] sourceCould not verify

  The Discussion and Results passages address hearing loss and cochlear hair-cell degeneration in Csb- and Csa-deficient mice. Searches for Parkinson’s disease, the ventrolateral tier, the substantia nigra, and movement disorders found no passage in our copy addressing the claimed cause of Parkinson’s movement disorders. (LLM, conf=0.77)

  Experimental — accuracy not yet measured
• cites [201]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites [202] sourceSupported

May combine two claims.

Dopamine autooxidizes to give O2•−, and ONOO- also oxidizes dopamine, providing further self-amplification.

“Further self-amplification would come from the facts that dopamine autooxidizes to give O2•− (219) and ONOO– also oxidizes dopamine (220).”

• cites [219] sourceNot checked — no full text of the source
• cites [220] sourceSupported

May combine two claims.

Parkinson's disease involves peripheral catecholamine neuron loss, including cardiac innervation at ventricles, right atrium, and sinus node causing orthostatic hypotension, and enteric nervous system loss causing early constipation.

“There is also loss of catecholamine neurons in the periphery (202), including cardiac innervation at the ventricles, right atrium, and sinus node (orthostatic hypotension), as well as in the enteric nervous system (constipation, an early disease stage).”

• cites [202] sourcePartly supported

  The paper’s Abstract says Parkinson’s disease affects peripheral autonomic neurons and that autonomic dysfunction may occur early. It does not specify loss of peripheral catecholamine neurons, the named sites of cardiac innervation, or a causal link from enteric neuron loss to early constipation. The indexed passages provide section labels but no page numbers. (LLM, conf=0.83)

  Experimental — accuracy not yet measured

May combine two claims.

In Parkinson's disease there is less neuronal loss in dorsal and medial tiers, pars reticulata, and ventral tegmental area, no astrocyte loss, and no loss of nearby red nucleus neurons.

“There is less neuronal loss in the dorsal and medial tiers, the substantia nigra’s pars reticulata, or the adjacent Ventral Tegmental Area, no loss of astrocytes, and no loss of neurons in the nearby red nucleus (200–202).”

• cites [200] sourceCould not verify

  The Results passages on cochlear hair and supporting cell loss and the Discussion address hearing loss in Csb- and Csa-deficient mice, not Parkinson’s disease. Searches for the substantia nigra, ventral tegmental area, astrocytes, and red nucleus found no passage in our copy addressing the claimed pattern of neuronal loss. (LLM, conf=0.78)

  Experimental — accuracy not yet measured
• cites [201]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites [202] sourcePartly supported

  The Distribution of Pathology section says dorsal and medial neuronal groups are less vulnerable and identifies the ventral tegmental region as a medial group. Table 3 lists the red nucleus as spared in PD. The paper does not establish less neuronal loss in the pars reticulata or explicitly state that astrocytes are not lost; it describes reactive astrocyte changes instead. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

May combine two claims.

Inflammatory cells including mast cells generate •NO and O2•−; •NO triggers vasodilation, while activated neutrophils and macrophages use NADPH oxidase-derived O2•− to kill targets.

“Inflammatory cells, including mast cells, generate both •NO and O2•−; the former triggers vasodilation, while activated neutrophils and macrophages use O2•− from NADPH oxidase to kill their targets (259).”

• cites [259] sourceCould not verify

  The Abstract discusses possible roles of amyloid-beta in innate immunity and inflammation, but not the claimed production or actions of nitric oxide and superoxide. Searches for mast cells, vasodilation, NADPH oxidase, and neutrophil or macrophage target killing found no passage addressing those mechanisms; page numbers are unavailable in our copy. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

May combine two claims.

Red Duroc pigs develop significant hypertrophic scarring whereas Yorkshire White pigs do not.

“In animals, the Red Duroc pig develops significant hypertrophic scarring whereas the Yorkshire White does not (259).”

• cites [259] sourceCould not verify

  The paper’s Abstract discusses Alzheimer’s-related brain changes in great apes, not wound healing or scarring in pigs. Searches for Red Duroc, Yorkshire White, and hypertrophic scarring found no passage addressing the claimed breed difference. (LLM, conf=0.78)

  Experimental — accuracy not yet measured

May combine two claims.

Neuromelanin is sparse or absent in lower animals, which do not develop sporadic Parkinson's disease.

“Neuromelanin is sparse or absent in lower animals (229, 233–235), which do not contract sporadic PD (236).”

• cites [229] sourceCould not verify

  The Abstract and Discussion describe neuromelanin in the human brain, and the Materials and methods describe human tissue samples. Searches for lower animals, species comparisons, and sporadic Parkinson’s disease found no passage establishing that neuromelanin is sparse or absent in lower animals. The sentence cites a different source for the claim that those animals do not develop sporadic PD. (LLM, conf=0.75)

  Experimental — accuracy not yet measured
• cites [233]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites [234] sourceNot checked — no full text of the source
• cites [235] sourceNot checked — no full text of the source
• cites [236] sourcePartly supported

  Section 5 (page unavailable) says rodents have little or no neuromelanin and do not naturally develop neurodegenerative diseases as they age, supporting the claim for rodents. But the same section reports neuromelanin-like pigment in several other animals, including primates, dogs, sheep and goats, so the generalization to lower animals is too broad. (LLM, conf=0.87)

  Experimental — accuracy not yet measured

May combine two claims.

An earlier event in Alzheimer's disease is pronounced neuron loss in the locus coeruleus, a site of neuromelanin accumulation and the first site to develop tau neurofibrillary tangles.

“But an earlier event is pronounced neuron loss in the locus coeruleus, a site of neuromelanin accumulation and the first site to develop the intracellular inclusions of tau protein termed neurofibrillary tangles (250, 251).”

• cites [250] sourcePartly supported

  The Introduction (page unavailable) places tau inclusions in the locus coeruleus at early stages of Alzheimer’s disease. It does not report pronounced neuron loss or neuromelanin accumulation there, and it names the transentorhinal cortex—not the locus coeruleus—as the proposed single starting site for Alzheimer’s tau inclusions. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [251] sourceNot checked — no full text of the source

May combine two claims.

In Alzheimer's disease, neuron loss extent does not correlate with neurofibrillary tangle extent; tangles occur in normal brain and there is a long delay between tangles and neuronal death.

“Yet the extent of neuron loss is not correlated with the extent of neurofibrillary tangles; tangles are present in normal brain and there is a long delay between the appearance of tangles and the onset of neuronal death (252, 251, 253).”

• cites [252] sourcePartly supported

  The Discussion reports a long gap between tau pathology and significant neuronal loss in the locus coeruleus, and says tangles are not always a surrogate for neuronal loss. The Results describe cognitively normal individuals at Braak stage I, consistent with tangles occurring without dementia. The paper does not establish the broader, categorical claim that the extent of neuronal loss is uncorrelated with the extent of tangles throughout Alzheimer’s disease. (LLM, conf=0.86)

  Experimental — accuracy not yet measured
• cites [251] sourceNot checked — no full text of the source
• cites [253] sourceNot checked — no full text of the source

May combine two claims.

Locus coeruleus neurons contain norepinephrine-derived neuromelanin, the dorsal motor nucleus of the vagus contains possibly dopaminergic neuromelanin, and raphe nuclei contain serotonin-derived neuromelanin.

“Locus coeruleus neurons contain norepinephrine-derived neuromelanin (227, 228); the dorsal motor nucleus of vagus contains neuromelanin that may be dopaminergic (202); and the raphe nuclei contain neuromelanin derived from their neurotransmitter, serotonin.”

• cites [227] sourceNot checked — no full text of the source
• cites [228] sourceNot checked — no full text of the source
• cites [202] sourceCould not verify

  Citation 202 is attached to the claim about the dorsal motor nucleus of the vagus. The Braak PD Staging Scheme section discusses pathology there, and the Conclusions table lists the region, but neither says it contains neuromelanin or that the pigment may be dopaminergic. Searches for those terms found no supporting passage in our copy. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

May combine two claims.

Parkinson's disease is proposed to start with CNS inflammation low in the brainstem, as in the Braak hypothesis, or with excitotoxic events anywhere, producing microglial •NO and O2•− and causing α-synuclein aggregates and Lewy bodies.

“Summarizing, the proposal is that Parkinson’s disease starts with CNS inflammation low in the brainstem, as in the Braak hypothesis (246), or with excitotoxic events anywhere, producing microglial •NO and O2•− and causing α-synuclein aggregates and Lewy bodies.”

• cites [246] sourcePartly supported

  The Introduction (page unavailable) describes early Parkinson’s pathology in the brainstem and says Braak and collaborators suggest that neurons in the dorsal motor nucleus of the vagus are first to degenerate. That supports the citation’s brainstem-starting comparison, but the paper does not describe CNS inflammation as the initiating event. The citation is attached to the Braak comparison, not the sentence’s later proposed microglial mechanism. (LLM, conf=0.85)

  Experimental — accuracy not yet measured

May combine two claims.

Light hair color and red hair MC1R alleles are risk factors for both melanoma and Parkinson's disease, and Parkinson's disease patients have a 7-fold elevated melanoma risk.

“Light hair color and the red hair alleles of the MC1R gene are risk factors for both melanoma and PD, while PD patients have a 7-fold elevated risk for melanoma (239, 240);”

• cites [239] sourceCould not verify

  The Results (§3.1; page unavailable) concern dopamine and noradrenergic neuron loss in MPTP-treated monkeys. Searches of our copy for MC1R, red hair, melanoma, and a 7-fold melanoma risk found no passage addressing either part of the claim. (LLM, conf=0.76)

  Experimental — accuracy not yet measured
• cites [240] sourcePartly supported

  The Discussion (page unavailable) reports higher Parkinson’s disease risk with lighter hair and the MC1R Arg151Cys variant; the paper also identifies both as melanoma risk factors. It does not report a sevenfold melanoma risk in patients with Parkinson’s disease. Instead, its Discussion cites a standardized melanoma event ratio of 3.3 in one group of patients with Parkinson’s disease. (LLM, conf=0.90)

  Experimental — accuracy not yet measured

May combine two claims.

By this means, TGFβ1 induces Type I collagen, smooth muscle actin, fibronectin 1, and fibrosis.

“By this means, TGFβ1 induces Type I collagen, smooth muscle actin, fibronectin 1, and fibrosis (267).”

• cites [267] sourceCould not verify

  The Wound healing section discusses H2O2 signaling and tissue repair, but does not address TGFβ1 or its induction of Type I collagen, smooth muscle actin, fibronectin 1, or fibrosis. Searches for the claim and for those terms together found no passage in our copy that addresses this mechanism; page numbers were not available. (LLM, conf=0.74)

  Experimental — accuracy not yet measured

May combine two claims.

Dying neurons release autolysosomal organelles containing neuromelanin, and these extracellular granules become sites where activated microglia proliferate.

“Dying neurons release autolysosomal organelles containing neuromelanin and these extracellular granules become the sites where activated microglia proliferate (114, 212).”

• cites [114] sourcePartly supported

  The ‘Synthesis and accumulation of NMs in neurons during aging’ section describes neuromelanin inside autolysosomal organelles. The ‘Role of human NMs in neuroinflammation and neurodegeneration’ section reports extracellular neuromelanin deposits after neuronal degeneration, close to activated microglia. Neither passage says that intact organelles are released or that microglia proliferate at the deposits; page numbers are unavailable in our copy. (LLM, conf=0.84)

  Experimental — accuracy not yet measured
• cites [212] sourcePartly supported

  In “Evidence that neuroinflammation compromises dopaminergic neuron survival” (page unavailable), the review says dying dopaminergic neurons may release chemoattractants that draw activated microglia to remove neuronal debris. It does not identify the released material as neuromelanin-containing autolysosomal organelles or say that microglia proliferate at extracellular granules. (LLM, conf=0.83)

  Experimental — accuracy not yet measured

May combine two claims.

Activated mast cells are more abundant in hypertrophic scars than normal scars, release cytokines, histamine, and serotonin, and are required for myofibroblast proliferation, wound contracture, and hypertrophic scarring.

“Notably, activated mast cells are more abundant in hypertrophic scars than in normal scars; they release cytokines, histamine, and serotonin, and they are required for myofibroblast proliferation, wound contracture, and the hypertrophic scarring (262–264).”

• cites [262] sourcePartly supported

  In Background > HTS formation (page not provided), the review says mast cells release histamine, stimulate fibroblast proliferation, and may contribute to fibrosis and hypertrophic-scar formation. It does not establish that activated mast cells are more abundant in hypertrophic scars than normal scars, that they release serotonin and cytokines, or that they are required for myofibroblast proliferation, wound contracture, and scarring. Its statement that eliminating mast cells may prevent scarring is more tentative than the claim. (LLM, conf=0.89)

  Experimental — accuracy not yet measured
• cites [263]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites [264] sourcePartly supported

  The Abstract and Discussion report increased mast-cell numbers in hypertrophic scars, histamine and cytokine release, and a possible role in excessive wound contraction and scarring. They do not establish that activated mast cells are more abundant than in normal scars, mention serotonin release, or show that mast cells are required for myofibroblast proliferation or hypertrophic scarring. The Discussion explicitly says mast cells are not absolutely required for normal wound contraction. (LLM, conf=0.90)

  Experimental — accuracy not yet measured

May combine two claims.

Lutein and zeaxanthin act as blue light filters and are now known to quench triplet states and scavenge 1O2*.

“These act as blue light filters yet are now known to also quench triplet states and scavenge 1O2* (299).”

• cites [299] sourceSupported

May combine two claims.

NADH's triplet energy of 2.9 eV is above DNA's, so NADH could create dCPDs if excited.

“NADH’s triplet energy of 2.9 eV lies above that of DNA (297), so it could create dCPDs if excited.”

• cites [297] sourceCould not verify

  The Results (§3.5) discuss molecular-docking energies of flavonoids, while the Discussion (§4) addresses their skin absorption and antioxidant effects; page numbers are unavailable in our copy. Searches for NADH, a 2.9 eV triplet energy, DNA energy transfer, and delayed cyclobutane pyrimidine dimers found no passage addressing the claim. (LLM, conf=0.76)

  Experimental — accuracy not yet measured

May combine two claims.

Microbial spores shift DNA from B-form to an A-like form that cannot make CPDs, using small acid soluble proteins that bind the DNA helix, because protein UV shielding is only a 2-fold effect.

“Microbial spores need to prevent CPDs and other lethal DNA damage for long time periods. UV shielding by protein is only a 2-fold effect. So spores instead shift their DNA conformation from B-form to an A-like form that can’t make CPDs, using small acid soluble proteins that bind the DNA helix (308).”

• cites [308] sourceCould not verify

  The Abstract discusses UV photostability of nucleic-acid bases, not protection of microbial spores. Searches for spores, small acid-soluble proteins, A-like DNA, CPDs, and two-fold protein shielding found no passage addressing the attributed mechanism or measurement. (LLM, conf=0.75)

  Experimental — accuracy not yet measured

May combine two claims.

Photoexciting putative degradation products of dioxetanes on indoles did not induce dCPDs, and their measured triplet energies were not high enough to do so.

“photoexciting putative degradation products of dioxetanes on indoles did not induce dCPDs; nor were the measured triplet energies of these products high enough to do so”

• cites [42] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

Photochemistry excites an electron from a fully occupied molecular orbital to a higher-energy unoccupied orbital, typically from HOMO to LUMO.

“Photochemistry excites an electron from one of a molecule’s fully-occupied molecular orbitals to a higher-energy unoccupied orbital.”

• cites [2]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

• cites [3]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

Chemiexcitation may be pathogenic in noise- and drug-induced deafness, Parkinson's disease, and Alzheimer's; it may protect against macular degeneration early in life but become pathogenic later.

“Chemiexcitation may therefore be a pathogenic event in noise- and drug-induced deafness, Parkinson’s disease, and Alzheimer’s; it may prevent macular degeneration early in life but turn pathogenic later.”

• AssumptionRests on an assumption: Several poorly understood chronic diseases share two features: inflammation produces the relevant radicals throughout tissue, and the cells that die contain melanin or neuromelanin.

Probably not a substantial claim: may not pass S3 (load-bearing).

Electronic excitation is an exception to ordinary biochemistry, in which shared electrons rearrange while remaining in the ground state.

“Electronic excitation is an exception to the reactions of ordinary biochemistry, in which electrons shared between atoms are rearranged while remaining in their ground state”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

A triplet state has a much longer lifetime than a singlet because decay to the singlet ground state requires a spin flip, which is forbidden and infrequent.

“Crucially, the triplet state has a much longer lifetime: A triplet can decay to the singlet ground state only if one electron reverses its spin direction, flipping its spin vector; this is a “forbidden” process that occurs infrequently.”

Probably not a substantial claim: may not pass S3 (load-bearing).

A triplet state has lower energy than the corresponding singlet.

“Triplet states have a lower energy than the corresponding singlet”

• cites [9] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

The [2+2] cycloaddition underlies formation of the lethal, mutagenic, carcinogenic CPD between adjacent thymine or cytosine bases when DNA absorbs a high-energy UV photon.

“This “[2+2] cycloaddition” reaction underlies the lethal, mutagenic, and carcinogenic cyclobutane pyrimidine dimer (CPD) created between adjacent thymine or cytosine bases when a high energy UV photon is absorbed by DNA”

• cites [6] sourceNot checked — no full text of the source
• cites [7] sourceNot checked — no full text of the source
• cites [8] sourceNot checked — no full text of the source

May combine two claims.

Because triplet spins are parallel, the pair has a net magnetic moment, making the molecule and its reactions sensitive to very weak magnetic fields.

“Because the two spins are no longer opposed, the pair now has a net magnetic moment, making the molecule and its chemical reactions sensitive to very weak magnetic fields”

• cites [11] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

Peroxynitrite is one of the few biological molecules capable of creating a dioxetane moiety.

“Peroxynitrite is one of the few biological molecules capable of creating a dioxetane moiety.”

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

Chemiexcited molecules can release more energy than ATP.

“Chemiexcited molecules, as in bioluminescence, can release more energy than ATP.”

Probably not a substantial claim: may not pass S4 (based).

Excited states permit bond rearrangements that are forbidden in ground states.

“Excited states also allow bond rearrangements forbidden in ground states.”

May combine two claims.

In test-tube experiments, mammalian enzymes, flavins, and metabolites participated in chemiluminescence reactions, and in vivo hormonal activity of substituted thyroid hormone analogs paralleled substituents' ability to alter intersystem crossing from triplet to singlet.

“In the test tube, mammalian enzymes, flavins, and metabolites participated in chemiluminescence reactions, and the in vivo hormonal activity of substituted thyroid hormone analogs paralleled the ability of the substituents to alter intersystem crossing from triplet to singlet state”

• cites [9] sourceNot checked — no full text of the source
• cites [24] sourceNot checked — no full text of the source
• cites [12] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

Peroxidase enzymes such as horseradish peroxidase and lipoxygenase can also create dioxetanes.

“Peroxidase enzymes such as horseradish peroxidase and lipoxygenase can also create dioxetanes”

• cites [12] sourceNot checked — no full text of the source
• cites [31] sourceNot checked — no full text of the source
• cites [14] sourceNot checked — no full text of the source

Classified as probably not a substantial claim.

Chemiexcitation is a route to electron excitation in which a chemical reaction creates a product already in an electronically excited state, rather than exciting a ground-state molecule.

“The universe of excited-electron reactions can instead be entered by a path not involving light, termed “chemiexcitation””

• cites [12] sourceNot checked — no full text of the source
• cites [13] sourceNot checked — no full text of the source
• cites [2]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

The dioxetane splits between the two Os and two Cs to yield two carbonyls, one of which receives most of the bond energy, creating a long-lived triplet with energy comparable to a UVB or UVA photon.

“The dioxetane splits between the two Os and two Cs to yield a pair of carbonyls (C=O), one of which receives most of the energy from the split bonds, creating a long-lived triplet state with as much energy as a UVB or UVA photon.”

Classified as probably not a substantial claim. May combine two claims.

Singlet excited states retain opposite spins of the two electrons, while triplet excited states have parallel spins in half-filled orbitals.

“Singlet states retain, even after excitation, the Pauli exclusion principle’s requirement that the two electrons have opposite spins”

• cites [9] sourceNot checked — no full text of the source
• cites [10] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

In vivo roles for these chemiexcited processes in mammals remained elusive.

“Yet, in vivo roles for these processes in mammals remained elusive”

• cites [31] sourceNot checked — no full text of the source
• cites [16] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

A photon can excite an electron to a higher-energy molecular orbital, leaving its partner behind, and the newly occupied orbital has about 10-fold more energy than ATP hydrolysis provides.

“a photon excites the electron to a higher-energy molecular orbital, with the electron’s partner left behind and the newly occupied orbital having an energy 10-fold higher than provided by ATP hydrolysis.”

May combine two claims.

The long triplet lifetime allows the excited molecule to collide with another molecule and initiate unusual reactions or energy transfers, and within a molecule allows longer-distance energy transfer.

“Yet the triplet’s long lifetime provides ample time for the excited molecule to collide with another molecule and initiate unusual chemical reactions or energy transfers; within a molecule it allows energy transfer over longer distance.”

May combine two claims.

In vertebrates, chemical excitation in vivo had been observed only as ultraweak visible or infrared bioluminescence from radical recombinations or lipid peroxidation, detectable by photon-counting instruments, and was considered adventitious.

“Chemical excitation in vertebrates had been observed in vivo only as ultraweak visible or infrared bioluminescence resulting from radical recombinations or lipid peroxidation, detectable using photon-counting instruments”

• cites [21] sourceNot checked — no full text of the source
• cites [22] sourceNot checked — no full text of the source
• cites [23] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

UVB photon energy is about 100 kcal/mol, 4 eV, equivalent to 50,000 K, and excitation drastically alters orbital shapes, enabling reactions impossible by thermal activation of ground-state reactants.

“These high energies – 100 kcal/mol, 4 eV, 50,000 K for a UVB photon – are accompanied by drastically altered orbital shapes”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Singlet states decay rapidly and can produce fluorescence; triplet states produce dim, prolonged phosphorescence.

“Singlet states decay rapidly to the ground state and can generate fluorescence. A triplet state’s difficulty in decaying allows only the dim and prolonged dribble of photons that is phosphorescence.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Singlet oxygen emits in the red and infrared.

“while singlet oxygen emits in the red and infrared”

• cites [54] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

Products of radical-radical reactions typically emit in the green to yellow (500-560 nm, ~2.3 eV).

“products of radical-radical reactions typically emit in the green to yellow (500-560 nm, ~2.3 eV)”

• cites [49] sourceNot checked — no full text of the source
• cites [23] sourceNot checked — no full text of the source

May combine two claims.

In alkoxyl radical dismutation, two -O• radicals encounter, one abstracts H from the other, becoming an alcohol and converting the other to a carbonyl; the stored radical energy allows the carbonyl to be in a triplet state.

“Two –O• radicals, each linked to a carbon chain such as a lipid, encounter each other. One abstracts H from the other, becoming an alcohol and converting the other to a carbonyl. Each radical had stored the substantial energy that is required make a radical by removing or adding an electron; this energy allows the carbonyl to be in a triplet state (C=O*).”

May combine two claims.

In alkylperoxyl radical annihilation (Russell reaction), two -O-O• radicals pair their unpaired electrons and split unequally into a carbonyl, O2, and an alcohol; often the O2 is excited singlet oxygen, but alternatively ground-state O2 and triplet C=O* form.

“Two – O–O• radicals, each attached to a carbon chain, encounter each other and thereby pair the two unpaired electrons. The new molecule eventually splits unequally into a carbonyl, an O2 molecule, and an alcohol. Often the O2 product is an excited 1O2*, as described above, but an alternative outcome is a ground state O2 and triplet state C=O*”

• cites [5] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

A dioxetanone is a dioxetane with an adjoining carbonyl, another strained four-atom ring containing C-O-O-C.

“A dioxetane with an adjoining carbonyl is a dioxetanone, another strained 4-atom ring containing C–O–O–C.”

May combine two claims.

Fluorescence in the infrared or red region is accounted for by singlet oxygen; O2 is one of the few molecules whose ground state is a triplet, so its lowest excited state is a singlet.

“Fluorescence in the infrared or red region is accounted for by the creation of singlet oxygen: O2 is one of the few molecules, natural or synthetic, that is a triplet in its ground state so its lowest excited state is a singlet”

May combine two claims.

Dioxetane-related compounds give carbonyls of the highest energy, which can luminesce in the UVA-blue region (375-455 nm, ~3 eV) or down to yellow, depending on the host molecule and enzyme active site.

“Dioxetane-related compounds give carbonyls of the highest energy; these can luminesce in the UVA-blue region (375-455 nm, ~3 eV) or down to yellow, depending on the host molecule and on the enzyme’s active site if the dioxetane was created enzymatically”

• cites [19] sourceNot checked — no full text of the source

May combine two claims.

These two radical encounter types can be common in cell membranes because lipids are sensitive to oxidation and lipid radicals diffuse in only two dimensions.

“These two types of radical encounter can be common in a cell membrane because their lipids are sensitive to oxidation and the lipid radicals diffuse in only two dimensions.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Radical recombination reactions that lead to excited states are well known, typically producing a singlet state at low quantum yield and weak fluorescence.

“Radical recombination reactions that lead to excited states are well known. The result is typically a singlet state created at low quantum yield and generating weak fluorescence”

• cites [12] sourceNot checked — no full text of the source
• cites [21] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based). May combine two claims.

Semiquinones and catechols are constituents of some melanins, the electron transport chain, and neurotransmitters.

“Semiquinones and catechols are constituents of some melanins, the electron transport chain, and neurotransmitters.”

May combine two claims.

Invertebrate luciferases add ambient O2 to a luciferin to form -O-OH; this hydroperoxide cyclizes at a C bonded to a leaving group, creating a dioxetanone ring containing C-O-O-C.

“Invertebrate luciferases add ambient O2 to a luciferin to form –O–OH. This hydroperoxide then cyclizes at a C bonded to a leaving group, creating a dioxetanone ring containing C–O–O–C.”

Probably not a substantial claim: may not pass S3 (load-bearing).

A potential alternative dioxetane site is the catechol ring.

“A potential alternative dioxetane site is the catechol ring”

• cites [43]Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

May combine two claims.

Ambient heat breaks the strained O-O bond in a dioxetane; the C-C then breaks, yielding two carbonyls, one in an excited triplet state and the other in the ground state.

“Ambient heat will break the strained O–O bond in a dioxetane. The C–C then also breaks, resulting in two carbonyls; one is in an excited triplet state and the other remains in the ground state.”

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

Invertebrate bioluminescence is produced by an enzymatic reaction that injects an electron into a dioxetanone's O-O bond, resulting in a singlet-excited carbonyl that fluoresces.

“Invertebrate bioluminescence is produced by an enzymatic reaction that injects an electron into a dioxetanone’s O–O bond, resulting in a singlet-excited carbonyl that fluoresces.”

May combine two claims.

Melanin is both a beneficial sunscreen and a pro-mutagen.

“Melanin is thereby not only a beneficial sunscreen but also a pro-mutagen.”

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based). May combine two claims.

The triplet state orbitals are a property of the entire molecule while the excited orbital is more localized on the C=O moiety.

“the more precise picture is that the triplet state orbitals are a property of the entire molecule while the excited orbital is more localized on the C=O moiety”

May combine two claims.

Enzymes such as cytochrome P450, cyclooxygenase, and lipoxygenase generate singlet oxygen by donating electrons that reduce lipid hydroperoxides to peroxyl radicals, accounting for much metabolic chemiluminescence.

“Enzymes such as cytochrome P450, cyclooxygenase, and lipoxygenase also generate 1O2*, evidently by donating electrons that reduce lipid hydroperoxides to peroxyl radicals, and they account for much of metabolic chemiluminescence”

• cites [21] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

In amorphous solid form, eumelanin can act as both a proton conductor and an electron semiconductor.

“One result of these loosely coupled electrons is that, in amorphous solid form, eumelanin can act as both a proton conductor and an electron semiconductor (93, 94).”

• cites [93] sourceNot checked — no full text of the source
• cites [94] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

For some excited carbonyl compounds, such as acetone from cleavage of simple dioxetanes, emission can be in the UVA region.

“For some excited carbonyl compounds, such as the acetone that results from cleavage of simple dioxetanes, the emission can be in the UVA region.”

May combine two claims.

The most common triplet energy transfer is to ambient O2 because O2 is a triplet in the ground state, so no overall spin flip is required.

“The most common triplet energy transfer is to ambient O2. This is because O2 is a triplet in the ground state, 3O2, so no overall spin flip is required.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Flavins contain three rings of delocalized electrons and two N atoms that can accept an electron as •H, facilitating one- or two-electron transfers.

“A family containing three rings of delocalized electrons includes flavins, which have two N that can accept an electron as •H, also facilitating one- or two-electron transfers.”

May combine two claims.

Pyrazinium rings form by glycation of histone H1 in close proximity to DNA, and pyridinium rings form during lipofuscin generation during macular degeneration.

“Pyrazinium rings also form by glycation of histone H1, in close proximity to DNA (120); pyridinium rings form during lipofuscin generation during macular degeneration (121).”

• cites [120] sourceNot checked — no full text of the source
• cites [121] sourceNot checked — no full text of the source

May combine two claims.

Dexter energy exchange is the only electronic energy transfer mechanism available to triplet states, and it is the pathway by which melanin fragment triplet energy transfers to DNA.

“This process, Dexter energy exchange, is the only electronic energy transfer mechanism available to triplet states; Dexter transfer is thus the pathway by which the melanin fragment’s triplet state energy transfers to DNA.”

May combine two claims.

Peroxynitrite can add to one of two carbonyls, cleave, and decompose to generate the same carbon-centered radical and dioxetane.

“Alternatively, peroxynitrite can add to one of the two carbonyls, cleave, and decompose to generate the same carbon-centered radical and dioxetane.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

FAD and FMN have electron transfer as their function, particularly in mitochondria.

“FAD and FMN (flavin adenine dinucleotide and flavin mononucleotide) have electron transfer as their function (115), particularly in the mitochondria.”

• cites [115] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

The simplest path for excited-state energy is heat: intersystem crossing to a high vibrational level of a singlet state, typically ground state, followed by dissipation as heat.

“The simplest path is heat: occasionally the excited electron’s spin flips and the molecule undergoes intersystem crossing to a high nuclear vibrational level of a singlet state of the same energy; typically this is the ground state (Fig. 3). This vibrational energy soon dissipates as heat, i.e., collision with surrounding molecules.”

May combine two claims.

Eumelanin is one of the strongest absorbers of sound and vibration known, and phonon absorption increases the electrical conductivity of eumelanin and related polymers.

“In the reverse direction, eumelanin is also one of the strongest absorbers of sound and vibration known (108, 109). Phonon absorption then increases the electrical conductivity of eumelanin and related polymers (110, 109).”

• cites [108] sourceNot checked — no full text of the source
• cites [109]Not checked — no full text of the source
• cites [110] sourceNot checked — no full text of the source

May combine two claims.

An excited electron in melanin can transfer its energy to O2 to make singlet oxygen, or be ejected to generate a free electron and superoxide, particularly in pheomelanin.

“The excited electron’s energy can transfer to O2 to make 1O2* (91) or the electron can be ejected completely to generate a free electron and thence O2•−, particularly in pheomelanin, the melanin of individuals with red or blonde hair (92, 91).”

• cites [91] sourceNot checked — no full text of the source
• cites [92] sourceNot checked — no full text of the source

May combine two claims.

Carbonyls and imines are electron rich and host dioxetanes.

“Carbonyls and imines (C=N, including Schiff bases) are electron rich and host dioxetanes.”

May combine two claims.

The indole family includes tryptophan, melatonin, and serotonin, and each can form a dioxetane or shows evidence of doing so.

“The indole family includes tryptophan, dozens of which are used for electron transfer during photosynthesis; the hormone melatonin; and the neurotransmitter serotonin. Each can form a dioxetane or shows evidence of doing so (111, 112).”

• cites [111] sourceNot checked — no full text of the source
• cites [112] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

Neuromelanins are polymers of eumelanin and pheomelanin assembled from oxidized serotonin, dopamine, norepinephrine, or related neurotransmitters, bound to protein and dolichol lipid in autolysosomes within neurons.

“Neuromelanins are polymers of eumelanin and pheomelanin assembled from oxidized serotonin, dopamine, norepinephrine, or related neurotransmitters, bound to protein and dolichol lipid in autolysosomes within neurons (113).”

• cites [113] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Semiquinones are stable oxygen-centered radicals, one of the few functional groups capable of one-electron transfer, and are used in the mitochondrial electron transport chain and to transduce between one- and two-electron transfer reactions.

“Semiquinones, with stable oxygen-centered radicals, provide one of the few functional groups capable of 1-electron transfer and so are used in the mitochondrial electron transport chain and ‘transduce’ between 1-electron and 2-electron transfer reactions.”

Probably not a substantial claim: may not pass S3 (load-bearing).

Unlike melanocyte melanin, neuromelanins are not synthesized by tyrosinase in melanosomes.

“Unlike melanocyte melanin, neuromelanins are not synthesized by tyrosinase in melanosomes.”

May combine two claims.

A sugar that acquires a =N moiety through a Maillard reaction with an amino acid can host a dioxetane, as apparently can the pyrazinium ring produced by condensation between two Maillard products.

“For example, a sugar that acquires a =N moiety through a Maillard reaction with an amino acid can host a dioxetane (118), as apparently can the pyrazinium ring produced by condensation between two Maillard products (119).”

• cites [118] sourceNot checked — no full text of the source
• cites [119] sourceNot checked — no full text of the source

May combine two claims.

If one carbonyl of a diketone isomerizes to an enol, an oxidizing agent can abstract the •H to convert the molecule to a carbon radical centered between the former carbonyls; ambient O2 adds to form a peroxyl radical, which cyclizes to a dioxetane.

“If one of the carbonyls isomerizes to an –OH (enol form), an oxidizing agent can abstract the •H to convert the molecule to a C radical centered between what were the carbonyls. Ambient O2 adds to form a peroxyl radical, which again cyclizes to a dioxetane (123).”

• cites [123] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing).

Acceptors such as DBAS that readily acquire triplet energy and convert it to fluorescent singlets are useful for detecting poorly luminescing triplet states and demonstrating triplet character.

“Acceptors that readily acquire triplet energy and efficiently convert it to fluorescent singlets, such as 9,l0-dibromoanthracene-2-sulfonate (DBAS), are a useful tool for detecting poorly luminescing triplet states and for demonstrating their triplet character (126).”

• cites [126] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based). May combine two claims.

An excited state eventually returns to the ground state, and its energy goes somewhere.

“An excited state eventually returns to the ground state, and its energy goes somewhere.”

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

In a rigid molecule, excited-state energy can be dissipated as a photon; from a triplet state this is phosphorescence underlying ultraweak luminescence.

“In a rigid molecule, the energy can be dissipated as a photon. When starting at a triplet state, this is the prolonged process of phosphorescence that underlies “ultraweak luminescence”.”

Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

For flavins and hemes, susceptibility to chemiexcitation follows naturally from their role in the electron transport chain.

“For flavins and hemes, the susceptibility to chemiexcitation follows naturally from their role in the electron transport chain.”

May combine two claims.

Energy transfer excites O2 to singlet oxygen, which is much more reactive than ordinary O2 because it can react with many singlet compounds.

“The energy transfer excites O2 to singlet oxygen, 1O2*, which is much more reactive than ordinary O2 because it can now react with the plethora of compounds that are singlets (127).”

• cites [127] sourceNot checked — no full text of the source

Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

Benzo[a]pyrene can host a dioxetane via a peroxide radical, and this has been proposed as an inflammation-related activation pathway.

“Benzo[a]pyrene can host a dioxetane via a peroxide radical, and this has been proposed to be an inflammation-related activation pathway (116).”

• cites [116] sourceNot checked — no full text of the source

May combine two claims.

The eumelanin polymer contains stable carbon-centered radicals, scavenges free radicals, and both eumelanin and pheomelanin bind large amounts of Ca, Fe, Cu, and Zn ions.

“The eumelanin polymer also contains stable carbon-centered radicals and scavenges free radicals, and both eu- and pheomelanin bind large amounts of Ca++ and Fe, Cu, and Zn ions (103, 104).”

• cites [103] sourceNot checked — no full text of the source
• cites [104] sourceNot checked — no full text of the source