Journal ArticleDOI
Toxic DNA damage by hydrogen peroxide through the Fenton reaction in vivo and in vitro.
TLDR
An in vitro Fenton system was established that generates DNA strand breaks and inactivates bacteriophage and that also reproduces the suppression of DNA damage by high concentrations of peroxide.Abstract:
Exposure of Escherichia coli to low concentrations of hydrogen peroxide results in DNA damage that causes mutagenesis and kills the bacteria, whereas higher concentrations of peroxide reduce the amount of such damage. Earlier studies indicated that the direct DNA oxidant is a derivative of hydrogen peroxide whose formation is dependent on cell metabolism. The generation of this oxidant depends on the availability of both reducing equivalents and an iron species, which together mediate a Fenton reaction in which ferrous iron reduces hydrogen peroxide to a reactive radical. An in vitro Fenton system was established that generates DNA strand breaks and inactivates bacteriophage and that also reproduces the suppression of DNA damage by high concentrations of peroxide. The direct DNA oxidant both in vivo and in this in vitro system exhibits reactivity unlike that of a free hydroxyl radical and may instead be a ferryl radical.read more
Citations
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Magnesium-Based Micromotors: Water-Powered Propulsion, Multifunctionality, and Biomedical and Environmental Applications.
TL;DR: With continuous innovation and attention to key challenges, it is expected that Mg-based motors will have a profound impact on diverse biomedical and environmental applications.
Journal ArticleDOI
Ascorbate peroxidase: A novel antioxidant enzyme in insects
TL;DR: Mathews et al. as mentioned in this paper proposed a method to identify larva larva in the soil of the Arkansas Agricultural Experiment Station (AES) by using an ascorbate free radical reductase.
Journal ArticleDOI
A unified vegetation index for quantifying the terrestrial biosphere.
Gustau Camps-Valls,Manuel Campos-Taberner,Álvaro Moreno-Martínez,Álvaro Moreno-Martínez,Sophia Walther,Gregory Duveiller,Alessandro Cescatti,Miguel D. Mahecha,Miguel D. Mahecha,Jordi Muñoz-Marí,Francisco Javier García-Haro,Luis Guanter,Martin Jung,John A. Gamon,John A. Gamon,Markus Reichstein,Steven W. Running +16 more
TL;DR: The presented nonlinear generalization of the celebrated normalized difference vegetation index (NDVI) consistently improves accuracy in monitoring key parameters, such as leaf area index, gross primary productivity, and sun-induced chlorophyll fluorescence.
Journal ArticleDOI
Atmospheric-pressure cold plasma treatment of contaminated fresh fruit and vegetable slices: inactivation and physiochemical properties evaluation
Ruixue Wang,W. F. Nian,H. Y. Wu,Hongqing Feng,K. Zhang,Jue Zhang,Weidong Zhu,Kurt Becker,Jing Fang +8 more
TL;DR: In this paper, a direct-current, atmospheric-pressure air cold plasma microjet (PMJ) was applied to disinfect Salmonella directly deposited on fresh fruit and vegetable slices.
Journal ArticleDOI
A peroxide-induced zinc uptake system plays an important role in protection against oxidative stress in Bacillus subtilis.
Ahmed Gaballa,John D. Helmann +1 more
TL;DR: The results indicate that peroxide stress leads to the upregulation of a dedicated Zn(II) uptake system that plays an important role in H2O2 and disulphide stress resistance.
References
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Journal ArticleDOI
The biology of oxygen radicals
TL;DR: The reactive superoxide radical, O2-, formerly of concern only to radiation chemists and radiobiologists, is now understood to be a normal product of the biological reduction of molecular oxygen.
Journal ArticleDOI
The catalytic decomposition of hydrogen peroxide by iron salts
Fritz Haber,Joseph Weiss +1 more
TL;DR: Wansbrough-Jones as discussed by the authors gave the manuscript of this paper to Professor Sir William Pope, but the final revision for the press had not been made and in its original from the paper was not suitable for publication in an English journal; but since, Professor Haber had considered carefully how he wished to present the results embodied in it, the form and sequence of the paper remain unmodified.