Role of oxidative stress in inactivation of Escherichia coli BW25113 by nanoscale zero-valent iron

2016 ◽  
Vol 565 ◽  
pp. 857-862 ◽  
Author(s):  
Krittanut Chaithawiwat ◽  
Alisa Vangnai ◽  
John M. McEvoy ◽  
Birgit Pruess ◽  
Sita Krajangpan ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Escherichia Coli ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

Unveiling the Role of Sulfur in Rapid Defluorination of Florfenicol by Sulfidized Nanoscale Zero-Valent Iron in Water under Ambient Conditions

2021 ◽  
Vol 55 (4) ◽  
pp. 2628-2638
Author(s):  
Zhen Cao ◽  
Hao Li ◽  
Gregory V. Lowry ◽  
Xiaoyang Shi ◽  
Xiangcheng Pan ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Ambient Conditions ◽  
Nanoscale Zero Valent Iron

Toxicity of sulfide-modified nanoscale zero-valent iron to Escherichia coli in aqueous solutions

Chemosphere ◽  
2019 ◽  
Vol 220 ◽  
pp. 523-530 ◽  
Author(s):  
Yujun Cheng ◽  
Haoran Dong ◽  
Yue Lu ◽  
Kunjie Hou ◽  
Yaoyao Wang ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Aqueous Solutions ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron

Role of respiration and glutathione in cadmium-induced oxidative stress in Escherichia coli K-12

2007 ◽  
Vol 189 (3) ◽  
pp. 271-278 ◽  
Author(s):  
Catarina C. Pacheco ◽  
João F. Passos ◽  
A. Rita Castro ◽  
Pedro Moradas-Ferreira ◽  
Paolo De Marco
Keyword(s):  
Oxidative Stress ◽  
Escherichia Coli ◽  
K 12

Transport of sucrose-modified nanoscale zero-valent iron in saturated porous media: role of media size, injection rate and input concentration

2015 ◽  
Vol 72 (9) ◽  
pp. 1463-1471 ◽  
Author(s):  
Hui Li ◽  
Yong-sheng Zhao ◽  
Zhan-tao Han ◽  
Mei Hong
Keyword(s):  
Porous Media ◽  
Packed Column ◽  
Injection Rate ◽  
Zero Valent Iron ◽  
Silica Sand ◽  
Saturated Porous Media ◽  
Input Concentration ◽  
K Value ◽  
Nanoscale Zero Valent Iron

The growing use of nanoscale zero-valent iron (NZVI) in the remediation of contaminated groundwater raises concerns regarding its transport in aquifers. Laboratory-scale sand-packed column experiments were conducted with bare and sucrose-modified NZVI (SM-NZVI) to improve our understanding of the transport of the nanoparticles in saturated porous media, as well as the role of media size, suspension injection rate and concentration on the nanoparticle behavior. As the main indicative parameters, the normalized effluent concentration was measured and the deposition rate coefficient (k) was calculated for different simulated conditions. Overall, compared to the high retention of bare NZVI in the saturated silica column, SM-NZVI suspension could travel through the coarse sand column easily. However, the transport of SM-NZVI particles was not very satisfactory in a smaller size granular matrix especially in fine silica sand. Furthermore, the value of k regularly decreased with the increasing injection rate of suspension but increased with suspension concentration, which could reflect the role of these factors in the SM-NZVI travel process. The calculation of k-value at the tests condition adequately described the experimental results from the point of deposition dynamics, which meant the assumption of first-order deposition kinetics for the transport of NZVI particles was reasonable and feasible.

scholarly journals Sigma S-Dependent Antioxidant Defense Protects Stationary-Phase Escherichia coli against the Bactericidal Antibiotic Gentamicin

2014 ◽  
Vol 58 (10) ◽  
pp. 5964-5975 ◽  
Author(s):  
Jing-Hung Wang ◽  
Rachna Singh ◽  
Michael Benoit ◽  
Mimi Keyhan ◽  
Matthew Sylvester ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Escherichia Coli ◽  
Stationary Phase ◽  
Antioxidant Defense ◽  
Physiological State ◽  
Pentose Phosphate ◽  
Phase Cell ◽  
Content Type

ABSTRACTStationary-phase bacteria are important in disease. The σs-regulated general stress response helps them become resistant to disinfectants, but the role of σsin bacterial antibiotic resistance has not been elucidated. Loss of σsrendered stationary-phaseEscherichia colimore sensitive to the bactericidal antibiotic gentamicin (Gm), and proteomic analysis suggested involvement of a weakened antioxidant defense. Use of the psfiAgenetic reporter, 3′-(p-hydroxyphenyl) fluorescein (HPF) dye, and Amplex Red showed that Gm generated more reactive oxygen species (ROS) in the mutant. HPF measurements can be distorted by cell elongation, but Gm did not affect stationary-phase cell dimensions. Coadministration of the antioxidantN-acetyl cysteine (NAC) decreased drug lethality particularly in the mutant, as did Gm treatment under anaerobic conditions that prevent ROS formation. Greater oxidative stress, due to insufficient quenching of endogenous ROS and/or respiration-linked electron leakage, therefore contributed to the greater sensitivity of the mutant; infection by a uropathogenic strain in mice showed this to be the case alsoin vivo. Disruption of antioxidant defense by eliminating the quencher proteins, SodA/SodB and KatE/SodA, or the pentose phosphate pathway proteins, Zwf/Gnd and TalA, which provide NADPH for ROS decomposition, also generated greater oxidative stress and killing by Gm. Thus, besides its established mode of action, Gm also kills stationary-phase bacteria by generating oxidative stress, and targeting the antioxidant defense ofE. colican enhance its efficacy. Relevant aspects of the current controversy on the role of ROS in killing by bactericidal drugs of exponential-phase bacteria, which represent a different physiological state, are discussed.

Induction of oxidative stress and SOS response in Escherichia coli by vegetable extracts: the role of hydroperoxides and the synergistic effect of simultaneous treatment with cisplatinum

Microbiology ◽  
2008 ◽  
Vol 77 (5) ◽  
pp. 523-529 ◽  
Author(s):  
I. V. Manukhov ◽  
V. Yu. Kotova ◽  
D. G. Mal’dov ◽  
A. V. Il’ichev ◽  
A. P. Bel’kov ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Escherichia Coli ◽  
Synergistic Effect ◽  
Sos Response ◽  
Simultaneous Treatment

Role of sulfide-modified nanoscale zero-valent iron on carbon nanotubes in nonradical activation of peroxydisulfate

2022 ◽  
Vol 422 ◽  
pp. 126949
Author(s):  
Libin Wu ◽  
Qintie Lin ◽  
Hengyi Fu ◽  
Haoyu Luo ◽  
Quanfa Zhong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Zero Valent Iron ◽  
Nanoscale Zero Valent Iron
Sign in / Sign up

Export Citation Format

Share Document