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Cited by 332

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Adsorption of plasmid DNA to mineral surfaces and protection against DNase I

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Romanowski, G, Lorenz, M G, Wackernagel, W·1991·Applied and Environmental Microbiology

Abstract

The adsorption of [3H]thymidine-labeled plasmid DNA (pHC314; 2.4 kb) of different conformations to chemically pure sand was studied in a flowthrough microenvironment. The extent of adsorption was affected by the concentration and valency of cations, indicating a charge-dependent process. Bivalent cations (Mg2+, Ca2+) were 100-fold more effective than monovalent cations (Na+, K+, NH4+). Quantitative adsorption of up to 1 microgram of negatively supercoiled or linearized plasmid DNA to 0.7 g of sand was observed in the presence of 5 mM MgCl2 at pH 7. Under these conditions, more than 85% of DNA adsorbed within 60 s. Maximum adsorption was 4 micrograms of DNA to 0.7 g of sand. Supercoil molecules adsorbed slightly less than linearized or open circular plasmids. An increase of the pH from 5 to 9 decreased adsorption at 0.5 mM MgCl2 about eightfold. It is concluded that adsorption of plasmid DNA to sand depends on the neutralization of negative charges on the DNA molecules and the mineral surfaces by cations. The results are discussed on the grounds of the polyelectrolyte adsorption model. Sand-adsorbed DNA was 100 times more resistant against DNase I than was DNA free in solution. The data support the idea that plasmid DNA can enter the extracellular bacterial gene pool which is located at mineral surfaces in natural bacterial habitats.

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Crossref · 10.1128/aem.57.4.1057-1061.1991

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Metadata

Authors
Romanowski, G., Lorenz, M. G., & Wackernagel, W.
Venue
Applied and Environmental Microbiology
Published
1991-04
Volume
57
Issue
4
Pages
1057-1061
ISSN
  • 0099-2240 (ISSN-L)
  • 1098-5336
OpenAlex
W1587890895
Cited by
332
References
10
FWCI
8.06
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Adsorption of plasmid DNA to mineral surfaces and protection against DNase I. https://app.cochat.ai/papers/10.1128/aem.57.4.1057-1061.1991
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Romanowski, G., Lorenz, M. G., & Wackernagel, W. (1991). Adsorption of plasmid DNA to mineral surfaces and protection against DNase I. Applied and Environmental Microbiology. https://doi.org/10.1128/aem.57.4.1057-1061.1991

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