The DOI matches its Crossref record; 38 of the 42 references it cites were found in a registry or an index; 14 of the 67 sources its claims cite were checked for support.
Ionizing radiation: how fungi cope, adapt, and exploit with the help of melanin
Open accessAbstract
Life on Earth has always existed in the flux of ionizing radiation. However, fungi seem to interact with the ionizing radiation differently from other inhabitants of the Earth. Recent data show that melanized fungal species like those from Chernobyl's reactor respond to ionizing radiation with enhanced growth. Fungi colonize space stations and adapt morphologically to extreme conditions. Radiation exposure causes upregulation of many key genes, and an inducible microhomology-mediated recombination pathway could be a potential mechanism of adaptive evolution in eukaryotes. The discovery of melanized organisms in high radiation environments, the space stations, Antarctic mountains, and in the reactor cooling water combined with phenomenon of 'radiotropism' raises the tantalizing possibility that melanins have functions analogous to other energy harvesting pigments such as chlorophylls.
Overview
AI snapshot
Written from the paper’s full text.
TL;DR
This review argues that melanized fungi can not only survive ionizing radiation but in some cases respond to it with directed growth or faster growth, possibly through melanin-mediated energy transduction and radioprotection. It synthesizes environmental, space, and laboratory evidence and proposes mechanisms while noting methodological caveats in some radiotropism studies.
Key findings
- Melanized fungi occupy extreme radiation environments, including Chernobyl reactor surfaces and cooling water, Antarctic/Arctic sites, and spacecraft. In Israel’s “Evolution Canyon,” the south-facing slope receives 200–800% more solar radiation, and *Aspergillus niger* there contains three times more melanin; isolates from that slope grew faster after exposure to up to 4,000 Gy of ⁶⁰Co radiation than north-slope isolates.
- Chernobyl-associated fungi showed “radiotropism”: across 27 fungus–radiation interactions, 18 (66.7%) displayed positive growth toward the radiation source, with significant directed growth to a ¹⁰⁹Cd source for several isolates. Later work reported radiation-promoted spore germination, or “radiostimulation,” and a “radioadaptive response” only for fungi from contaminated regions, though the authors note possible technical limitations.
- Irradiation changed melanin’s electron spin resonance signal, and irradiated melanin showed a fourfold greater capacity to reduce NADH. Melanized *Cryptococcus neoformans*, *Wangiella dermatitidis*, and *Cladosporium sphaerospermum* showed increased metabolic activity or growth after radiation about 500 times background, including threefold greater ¹⁴C-acetate incorporation; melanin’s protective effects were attributed to free-radical quenching and its spherical arrangement.
- Yeast studies linked radiation responses to cell-cycle, DNA-processing, repair, recombination, and stress genes. A microhomology-mediated recombination pathway induced by 50 Gy gamma-rays in *Saccharomyces cerevisiae* was proposed as a possible route to adaptive evolution, but the authors consider it unlikely to explain rapid growth effects in irradiated melanized fungi.
Methods
- Narrative review synthesizing published studies on fungi in high-radiation environments, spacecraft, melanin–radiation interactions, and genetic responses to radiation; no new primary experiments are reported.
- Evidence discussed includes Chernobyl isolates, ⁶⁰Co exposures up to 4,000 Gy, collimated ³²P and ¹⁰⁹Cd beams, ¹²¹Sn and ¹³⁷Cs sources, International Space Station surveys, a 7-month open-space exposure, melanin ESR/HPLC assays, XTT/MTT metabolic assays, CFU/dry-weight/¹⁴C-acetate measurements, and yeast microarray and recombination studies.
- Main analysis is qualitative synthesis and hypothesis generation rather than systematic review or meta-analysis.
Limitations
- Stated by the authors: later radiotropism/radiostimulation studies used radioactive sources roughly 1,000-fold less active than earlier work, possibly too weak to stimulate hyphal growth; low-energy ¹²¹Sn and ¹³⁷Cs beta particles may have been absorbed by the Petri dish, meaning actual doses could have been overestimated.
- Evident from the text: as a review, it lacks a systematic search strategy, formal quality appraisal, or meta-analysis, and many conclusions depend on cited studies with varied organisms, radiation sources, and endpoints.
- Evident from the text: the proposal that melanin acts like an energy-harvesting pigment analogous to chlorophyll is explicitly speculative and requires future experimental testing.
Model-written summary. Check it against the paper before relying on it.
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Claims the paper makes
19 No full text of the sources · 11 Supported · 7 Not checked yet · 6 Sources not found · 3 Partly supported · 1 Own interpretation · accuracy not yet measured
Every source the paper cites for this claim was checked and supports it.
In the paper
“Recent data show that melanized fungal species like those from Chernobyl’s reactor respond to ionizing radiation with enhanced growth.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > Abstract
What the sources say
- Supportedcites [25] source
The Results identify C. sphaerospermum as a dominant species inhabiting the damaged Chernobyl reactor and report increased growth of its melanized colonies under radiation. The Abstract also reports radiation-enhanced growth in melanized fungal species. Page numbers are not provided in our copy. (LLM, conf=0.92)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“Aspergillus niger which contain 3 times more melanin than the same species from the north-facing slope (10).”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > FUNGI INHABITING ENVIRONMENTS WITH HIGH RADIATION LEVELS
What the sources say
- Supportedcites [10] source
The Results (Melanin concentration) report that mean conidial melanin in A. niger strains from the sunny slope was about three times that in strains from the shady slope. The Site description identifies these as the south-facing and north-facing slopes, respectively; page numbers are not provided in our copy. (LLM, conf=0.95)
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“It has two slopes - north facing “European” slope and south-facing “African” slope with the latter receiving 200–800% higher solar radiation than the north slope”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > FUNGI INHABITING ENVIRONMENTS WITH HIGH RADIATION LEVELS
What the sources say
- Supportedcites [10] source
The Introduction explicitly says that Evolution Canyon’s south-facing “African” slope receives 200–800% higher solar radiation than its north-facing “European” slope. The Abstract (Background) repeats the same comparison. (LLM, conf=0.95)
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“being populated by many species of melanized fungi such Aspergillus niger which contain 3 times more melanin than the same species from the north-facing slope (10).”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > FUNGI INHABITING ENVIRONMENTS WITH HIGH RADIATION LEVELS
What the sources say
- Supportedcites [10] source
The Discussion (page unavailable) says melanic fungi were prevalent in sunny habitats on the south-facing African slopes. The Introduction identifies Aspergillus niger as the fungus studied on those slopes, and the Results report about threefold higher mean melanin concentration in its south-slope strains than in north-slope strains. (LLM, conf=0.88)
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“Chan et al. studied MHMR in S. cerevisiae irradiated with 50 Gy gamma-rays (35) and showed that a DSB-induced genome-wide MHMR pathway could lead to large-scale genomic rearrangements after a single DSB end invades another genomic location.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > GENETIC EFFECTS OF RADIATION ON FUNGI
What the sources say
- Supportedcites [35] source
The Results and γ-Irradiation Methods report exposing yeast cells to 50 Gy of γ-rays. The Discussion states that DSBs induce a genome-wide MHMR pathway and says it is plausible that this pathway could cause large-scale genomic rearrangements after a single DSB end invades another genomic location. The citing sentence preserves that possibility rather than claiming the rearrangements were observed. (LLM, conf=0.94)
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“Irradiated melanin manifested a 4-fold increase in its capacity to reduce NADH relative to non-irradiated melanin.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > SUGGESTED MECHANISM OF RADIATION ENERGY UTILIZATION BY FUNGI
What the sources say
- Supportedcites [25] source
The Abstract states the claim verbatim. The Results section reports that 40 minutes of irradiation produced a fourfold increase in the velocity of the NADH/ferricyanide coupled reaction compared with non-irradiated melanin. (LLM, conf=0.95)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“radiation enhanced the growth of melanized C. sphaerospermum cells under limited nutrients conditions.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > SUGGESTED MECHANISM OF RADIATION ENERGY UTILIZATION BY FUNGI
What the sources say
- Supportedcites [25] source
The Results section reports that irradiated melanized C. sphaerospermum colonies grew more than controls both with limited sucrose and without sucrose. It concludes that irradiated melanized cells experienced increased growth even under starvation conditions. (LLM, conf=0.94)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Supported
In the paper
“Radiation exposure causes upregulation of many key genes, and an inducible microhomology-mediated recombination pathway could be a potential mechanism of adaptive evolution in eukaryotes.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > Abstract
What the sources say
- Not checked — no full text of the sourcecites [30] source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
In the paper
“many fungi, especially melanized ones are very radioresistant, with LD10 values approaching or exceeding 1 kGy (Table 1).”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > COMPARATIVE RADIOSENSITIVITY OF BACTERIA AND FUNGI
What the sources say
- Not matchedcites Table 1
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
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- Not matched
In the paper
“melanized fungal species are found in the so-called reactor cooling pool water.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > FUNGI INHABITING ENVIRONMENTS WITH HIGH RADIATION LEVELS
What the sources say
- Not matchedcites [13]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Not matched
- Probably not a substantial claim. 5
- It may state two separate claims as one. 17
Every source the paper cites for this claim was checked and supports it.
In the paper
“an inducible microhomology-mediated recombination pathway could be a potential mechanism of adaptive evolution in eukaryotes.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > Abstract
What the sources say
- Supportedcites [35] source
The Discussion explicitly proposes that an inducible MHMR pathway could be a potential mechanism of adaptive evolution in eukaryotes. The claim preserves the paper’s tentative wording. (LLM, conf=0.95)
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
- Supported
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“Bacterium Deinococcus radiodurans is considered the most radioresistant microorganism known with an LD10 for some strains approaching 15 kGy (14).”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > COMPARATIVE RADIOSENSITIVITY OF BACTERIA AND FUNGI
What the sources say
- Partly supportedcites [14] sourceExperimental — accuracy not yet measured
The Background reports D. radiodurans with D10 ≈ 15 kGy and describes it as a model for studying radiation resistance. It does not establish that it is the most radioresistant microorganism known; the Background also gives D. geothermalis a D10 of approximately 15 kGy. (LLM, conf=0.86)
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Partly supported
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“Melanized W. dermatitidis and C. neoformans cells exposed to ionizing radiation approximately 500 times higher than background grew significantly faster as indicated by higher CFUs, more dry weight biomass and 3-fold greater incorporation of 14C-acetate than non-irradiated melanized cells or irradiated albino mutants.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > SUGGESTED MECHANISM OF RADIATION ENERGY UTILIZATION BY FUNGI
What the sources say
- Partly supportedcites [25] sourceExperimental — accuracy not yet measured
Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Partly supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“ionizing irradiation changed the electron spin resonance (ESR) signal of melanin, consistent with changes in electronic structure (25).”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > SUGGESTED MECHANISM OF RADIATION ENERGY UTILIZATION BY FUNGI
What the sources say
- Supportedcites [25] source
The Methodology/Principal Findings passage states the claim directly. The Results section reports a large change in the ESR signal after irradiation, and the Discussion interprets ESR amplitude changes as evidence of altered electronic structure. No page numbers are provided in our copy. (LLM, conf=0.95)
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“They concluded that inducible MHMR pathway could be a potential mechanism of adaptive evolution in eukaryotes.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > GENETIC EFFECTS OF RADIATION ON FUNGI
What the sources say
- Supportedcites [35] source
In the Discussion, the authors explicitly propose that an inducible MHMR pathway could be a potential mechanism of adaptive evolution in eukaryotes. The citing sentence preserves the proposal’s tentative wording. (LLM, conf=0.95)
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
- Supported
Every source the paper cites for this claim was checked and supports it.
In the paper
“The observations that melanized fungal cells manifested increased growth relative to non-melanized cells after exposure to ionizing radiation raised the intriguing possibility that melanin can function in energy capture and utilization (25).”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > SUGGESTED MECHANISM OF RADIATION ENERGY UTILIZATION BY FUNGI
What the sources say
- Supportedcites [25] source
The Results section reports that irradiated melanized colonies grew more than irradiated melanin-deficient cells. The Discussion cautiously suggests that melanin may allow fungi to harness radiation for metabolic energy, matching the citing sentence’s description of a possibility rather than an established mechanism. (LLM, conf=0.94)
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim.
- Supported
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“These observations might explain the radioadaptive response in fungi described by Zhdanova group (18–20), but are an unlikely explanation for the enhanced growth effects of irradiated melanized organisms, which responded within hours.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > GENETIC EFFECTS OF RADIATION ON FUNGI
What the sources say
- Not checked — no full text of the sourcecites [18] source
- Not matchedcites [19]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Not checked — no full text of the sourcecites [20] source
- Partly supportedcites [35] sourceExperimental — accuracy not yet measured
The Discussion (page unavailable) reports an inducible radiation-related recombination process in yeast and proposes that it could contribute to adaptive evolution under genotoxic stress. It does not examine the radioadaptive response reported by the Zhdanova group or the within-hours growth of irradiated melanized organisms; those comparisons are the citing authors’ interpretation. (LLM, conf=0.83)
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Fungi colonize space stations and adapt morphologically to extreme conditions.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > Abstract
What the sources say
- Not matchedcites [24]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Not matched
In the paper
“When melanin ‘ghosts’ isolated from melanized cells were crushed - they lost much of their radioprotective shielding properties indicating that the spherical arrangement of melanin particles in the hollow shell contributed to radioprotection.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > SUGGESTED MECHANISM OF RADIATION ENERGY UTILIZATION BY FUNGI
What the sources say
- Not checked — no full text of the sourcecites [29] source
hedgeddirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Non-melanized C. neoformans and Histoplasma capsulatum are highly resistant to radiation but the presence of melanin further enhanced survival at higher doses.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > SUGGESTED MECHANISM OF RADIATION ENERGY UTILIZATION BY FUNGI
What the sources say
- Not checked — no full text of the sourcecites [29] source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“Melanized fungi inhabit some remarkably extreme environments on the planet including Arctic and Antarctic regions and high altitude terrains, with the latter habitats being characterized by the naturally occurring higher radiation levels than lower altitudes (9).”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > FUNGI INHABITING ENVIRONMENTS WITH HIGH RADIATION LEVELS
What the sources say
- Not checked — no full text of the sourcecites [9] source
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Contrary to their previous results (17) they observed the “radiostimulation” only for the species from contaminated regions but not for isolates from the clean areas. They named this phenomenon “radioadaptive response”.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > RADIOTROPISM OF CHERNOBYL-ASSOCIATED FUNGI
What the sources say
- Not checked — no full text of the sourcecites [18] source
- Not matchedcites [19]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“A remarkable aspect of melanins is their ability to absorb all types of electromagnetic radiation (36) which endows them with the capacity for both energy transduction and shielding.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > MELANINS AND RADIATION IN PERSPECTIVE
What the sources say
- Not checked — no full text of the sourcecites [36] source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“The survey of the environmental contamination on board of the International Space Station (ISS) revealed many fungal species on the surfaces and in the air (Table 2) with Aspergillus sp., Penicillium sp., and Saccharomyces sp. being the most dominant genera among fungi.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > FUNGI INHABITING THE SPACE CRAFT
What the sources say
- Not checked — no full text of the sourcecites [22] source
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“We concluded that melanin protected fungi against ionizing radiation and its radioprotective properties were a function of its chemical composition, free radical quenching and spherical spatial arrangement (29).”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > SUGGESTED MECHANISM OF RADIATION ENERGY UTILIZATION BY FUNGI
What the sources say
- Not checked — no full text of the sourcecites [29] source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“the activity of the radioactive sources used in the later studies (18–20) was approximately 1,000 lower than used in earlier work (17) which might have been insufficient to promote the hyphal growth.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > RADIOTROPISM OF CHERNOBYL-ASSOCIATED FUNGI
What the sources say
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“the beta particles from 137Cs might have been absorbed by the material of the Petri dish with the fungi as the collimated beam was coming from beneath and thus have not contributed to the actual radiation doses which could have been overestimated.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > RADIOTROPISM OF CHERNOBYL-ASSOCIATED FUNGI
What the sources say
hedgedconditional- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: fails — The paper’s conclusions may not depend on it.
- Based: passes — The paper gives a reason why it holds.
Probably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“The levels of ionizing radiation that these fungi encounter in the space stations – approximately 4 cGy per year (23) are not fungicidal (4–7, 13) and allow fungi to thrive provided the humidity levels are sufficient.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > FUNGI INHABITING THE SPACE CRAFT
What the sources say
- Not matchedcites [23]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Not checked — no full text of the sourcecites [4] source
- Not checked — no full text of the sourcecites [5] source
- Not matchedcites [6]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Not matchedcites [7]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
- Not matchedcites [13]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Not matched
In the paper
“Altogether 27 responses of interactions between fungal isolates and radiation source were investigated. Of these, 18 (66.7%) showed positive stimulation of growth towards the radiation source (low mean return angle), and eight showed no response.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > RADIOTROPISM OF CHERNOBYL-ASSOCIATED FUNGI
What the sources say
- Not checked — no full text of the sourcecites [17] source
plaindirect- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
In the paper
“the polysaccharide capsule and melanin layer in P. expansum were significantly increased in comparison with control samples, as well the numbers of mitochondria and vacuoles in space-exposed fungi were much higher than in controls.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > FUNGI INHABITING THE SPACE CRAFT
What the sources say
- Not matchedcites [24]
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
plaincorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
- Not matched
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“many of the microorganisms inhabiting the space station – both bacteria and fungi – were found to be pigmented or melanized, which hints at the usefulness of pigments presence in those cells under the extreme conditions.”
§ Ionizing Radiation: how fungi cope, adapt, and exploit with the help of melanin > FUNGI INHABITING THE SPACE CRAFT
hedgedcorrelational- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
It may state two separate claims as one.
Citations
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“…thrive in highly irradiated conditions: a species of radiotrophic fungus ( Cladosporium sphaerospermum ) that performs radiosynthesis (Skunk, Gomez, and Averesch 2020), using melanin to convert gamma radiation into chemical energy for growth (Dadachova et al. 2007; Dadachova and Casadevall 2008).”
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“Their abundance in a region is an indication of ionising radiation incidences and has been affirmed as a potent indicator of the carbon-based radioactive debris originating from the nuclear reactor (Dadachova and Casadevall 2008).”
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“Its ability to absorb the entire electromagnetic spectrum, from gamma rays [29,31] to UV [32–34] to radio waves [35–39], makes it the “blackest” substance known in nature and gives it a fundamental role in cellular bioenergetics, as summarized in the next section.”
Metadata
- Authors
- Dadachova, E., & Casadevall, A.
- Affiliations
- Albert Einstein College of Medicine (US)
- Corresponding author
- Dadachova, Ekaterina
- Casadevall, Arturo
- Venue
- Current Opinion in Microbiology
- Publisher
- Elsevier BV
- Published
- 2008-12
- Volume
- 11
- Issue
- 6
- Pages
- 525-531
- ISSN
- 1369-5274 (ISSN-L)
- PMC
- PMC2677413
- OpenAlex
- W2018461548
- Cited by
- 399
- References
- 42
- Citations by year
- 2026: 21 · 2025: 33 · 2024: 25 · 2023: 24 · 2022: 46 · 2021: 36 · 2020: 39 · 2019: 34 · 2018: 25 · 2017: 24 · 2016: 15 · 2015: 10 · 2014: 19 · 2013: 12 · 2012: 12
- FWCI
- 0.57
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Current Opinion in Microbiology (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health (5r01ai052733-16, 5r37ai033142-24)
- National Institute of Allergy and Infectious Diseases (AI-033774, R01AI033142, R37-AI033142, AI60507, AI033142, R01-AI052733, R56AI060507, R01AI060507, R01AI033774)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Microbial Metabolism and Applications
- Keywords
- ionizing radiation, fungi, melanin, radiation adaptation, microhomology-mediated recombination, adaptive evolution, gene upregulation
- MeSH terms
- Fungi, Melanins, Radiation, Ionizing
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
A language model drew the claims from the paper on 2026-09-28, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).
A second model labelled each claim on 2026-09-28 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).
Cited sources are checked with a language model’s help (gpt-6-sol).
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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