The critical role of light in moderating microbial stress due to mixtures of engineered nanomaterials

2018 ◽  
Vol 5 (1) ◽  
pp. 96-102 ◽  
Author(s):  
Carolyn M. Wilke ◽  
Jean-François Gaillard ◽  
Kimberly A. Gray
Keyword(s):  
Critical Role ◽  
Engineered Nanomaterials ◽  
Metal Nanoparticle ◽  
Toxic Effects ◽  
Solar Irradiation ◽  
Localized Surface Plasmon ◽  
E Coli ◽  
Simulated Solar Irradiation ◽  
Role Of Light

Light influences chemical interactions of engineered nanomaterials and their toxic effects. Under simulated solar irradiation, we observed that binary mixtures of n-Ag, n-Au, or n-Pt with n-TiO2cause synergistic toxic effects inE. colidue to photochemical interactions governed by metal nanoparticle stability and localized surface plasmon resonance.

SATP (YaaH), a succinate–acetate transporter protein in Escherichia coli

2013 ◽  
Vol 454 (3) ◽  
pp. 585-595 ◽  
Author(s):  
Joana Sá-Pessoa ◽  
Sandra Paiva ◽  
David Ribas ◽  
Inês Jesus Silva ◽  
Sandra Cristina Viegas ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Acetic Acid ◽  
Succinic Acid ◽  
Critical Role ◽  
Amino Acid Residues ◽  
E Coli ◽  
Transporter Protein ◽  
Affinity Constants ◽  
In Trans

In the present paper we describe a new carboxylic acid transporter in Escherichia coli encoded by the gene yaaH. In contrast to what had been described for other YaaH family members, the E. coli transporter is highly specific for acetic acid (a monocarboxylate) and for succinic acid (a dicarboxylate), with affinity constants at pH 6.0 of 1.24±0.13 mM for acetic acid and 1.18±0.10 mM for succinic acid. In glucose-grown cells the ΔyaaH mutant is compromised for the uptake of both labelled acetic and succinic acids. YaaH, together with ActP, described previously as an acetate transporter, affect the use of acetic acid as sole carbon and energy source. Both genes have to be deleted simultaneously to abolish acetate transport. The uptake of acetate and succinate was restored when yaaH was expressed in trans in ΔyaaH ΔactP cells. We also demonstrate the critical role of YaaH amino acid residues Leu131 and Ala164 on the enhanced ability to transport lactate. Owing to its functional role in acetate and succinate uptake we propose its assignment as SatP: the Succinate–Acetate Transporter Protein.

Bifunctional Cu2-xSe-decorated hierarchical TiO2 nanotube mesh with solar water evaporation and photodegradation effects for clean water generation

2019 ◽  
Vol 19 (7) ◽  
pp. 2001-2008
Author(s):  
Peng Ren ◽  
Xiuchun Yang
Keyword(s):  
Solar Energy ◽  
Low Cost ◽  
Water Shortage ◽  
Tio2 Nanotube ◽  
Solar Irradiation ◽  
Localized Surface Plasmon ◽  
Water Evaporation ◽  
Solar Water ◽  
Feasible Solutions ◽  
Simulated Solar Irradiation

Abstract The desalination and purification of sea or brackish water by utilizing solar energy are considered to be the most feasible solutions to overcome the problems of water shortage and pollution. In this study, a bifunctional Cu2-xSe-decorated hierarchical TiO2 nanotube mesh (CTNM) was designed and synthesized successfully for both solar water evaporation and photodegradation. Cu2-xSe enhances solar light absorption and solar water evaporation performance as a low-cost absorber because of its localized surface plasmon resonance (LSPR) effect. Meanwhile, the formation of the p-Cu2-xSe/n-TiO2 heterojunction improves the photodegradation performance by increasing separation and transport of photogenerated charge carriers. Hence, CTNM has a relatively high solar water evaporation conversion efficiency of 83.06% and also can photodegrade 95% of methyl orange after 3 h under 2.5 kW m−2 simulated solar irradiation, which demonstrate the extremely high utilization ratio of solar energy of CTNM.

Factors determining the toxicity of engineered nanomaterials to Tetrahymena thermophila in freshwater: the critical role of organic matter

2020 ◽  
Vol 7 (1) ◽  
pp. 304-316 ◽  
Author(s):  
Dingyuan Liang ◽  
Xiangrui Wang ◽  
Shu Liu ◽  
Ying Zhu ◽  
Ying Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Tetrahymena Thermophila ◽  
Critical Role ◽  
Engineered Nanomaterials

Organic matter could highly affect the bioavailability of nanomaterials which depends on the composition and conformation of the organic matter.

Critical Role of Zinc Ion on E. coli Glutamyl-Queuosine-tRNAAsp Synthetase (Glu-Q-RS) Structure and Function

2014 ◽  
Vol 33 (2) ◽  
pp. 143-149 ◽  
Author(s):  
Sutapa Ray ◽  
Victor Banerjee ◽  
Mickael Blaise ◽  
Baisakhi Banerjee ◽  
Kali Pada Das ◽  
...  
Keyword(s):  
Critical Role ◽  
Zinc Ion ◽  
Structure And Function ◽  
E Coli ◽  
And Function

scholarly journals Synergistic effect of heat and solar UV on DNA damage and water disinfection of E. coli and bacteriophage MS2

2012 ◽  
Vol 10 (4) ◽  
pp. 605-618 ◽  
Author(s):  
Dana Jennifer Theitler ◽  
Abid Nasser ◽  
Yoram Gerchman ◽  
Abraham Kribus ◽  
Hadas Mamane
Keyword(s):  
Dna Damage ◽  
Synergistic Effect ◽  
Water Disinfection ◽  
Solar Irradiation ◽  
Solar Simulator ◽  
E Coli ◽  
Bacteriophage Ms2 ◽  
Sensitive Site ◽  
Solar Uv ◽  
Simulated Solar Irradiation

The response of a representative virus and indicator bacteria to heating, solar irradiation, or their combination, was investigated in a controlled solar simulator and under real sun conditions. Heating showed higher inactivation of Escherichia coli compared to the bacteriophage MS2. Heating combined with natural or simulated solar irradiation demonstrated a synergistic effect on the inactivation of E. coli, with up to 3-log difference for 50 °C and natural sun insolation of 2,000 kJ m−2 (compared to the sum of the separate treatments). Similar synergistic effect was also evident when solar-UV induced DNA damage to E. coli was assessed using the endonuclease sensitive site assay (ESS). MS2 was found to be highly resistant to irradiation and heat, with a slightly synergistic effect observed only at 59 °C and natural sun insolation of 5,580 kJ m−2. Heat treatment also hindered light-dependent recovery of E. coli making the treatment much more effective.

New nuclear reaction flow during r-process nucleosynthesis in supernovae: The critical role of light neutron-rich nuclei

2001 ◽  
Vol 688 (1-2) ◽  
pp. 581-583 ◽  
Author(s):  
M. Terasawa ◽  
K. Sumiyoshi ◽  
T. Kajino ◽  
I. Tanihata ◽  
G.J. Mathews ◽  
...  
Keyword(s):  
Nuclear Reaction ◽  
Critical Role ◽  
R Process ◽  
Role Of Light

scholarly journals Resistance and induction of viable but non culturable states (VBNC) during inactivation of E. coli and Klebsiella pneumoniae by addition of H2O2 to natural well water under simulated solar irradiation

2021 ◽  
Vol 188 ◽  
pp. 116499 ◽  
Author(s):  
John J. Alvear-Daza ◽  
Alejandra García-Barco ◽  
Paula Osorio-Vargas ◽  
Héctor M. Gutiérrez-Zapata ◽  
Janeth Sanabria ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Solar Irradiation ◽  
Well Water ◽  
E Coli ◽  
Simulated Solar Irradiation

Investigation of the role of platinum oxide for the degradation of phenol under simulated solar irradiation

2013 ◽  
Vol 136-137 ◽  
pp. 248-259 ◽  
Author(s):  
Harrison S. Kibombo ◽  
Chia-Ming Wu ◽  
Rui Peng ◽  
Jonas Baltrusaitis ◽  
Ranjit T. Koodali
Keyword(s):  
Platinum Oxide ◽  
Solar Irradiation ◽  
Simulated Solar Irradiation

scholarly journals Photocatalytic Bactericidal Performance of LaFeO3 under Solar Light: Kinetics, Spectroscopic and Mechanistic Evaluation

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1135
Author(s):  
Nazmiye Cemre Birben ◽  
Ezgi Lale ◽  
Renato Pelosato ◽  
Ceyda Senem Uyguner Demirel ◽  
Isabella Natali Sora ◽  
...  
Keyword(s):  
Reaction Medium ◽  
Solar Irradiation ◽  
Spectroscopic Techniques ◽  
Ultrapure Water ◽  
Contributing Factors ◽  
Experimental Conditions ◽  
E Coli ◽  
Almost All ◽  
Simulated Solar Irradiation

Lanthanum orthoferrites are a versatile class of catalysts. Here, the photocatalytic bactericidal performance of LaFeO3 (LF) to inactivate pathogenic microorganisms, i.e., Escherichia coli (E. coli), in water under simulated solar irradiation conditions was investigated. Various competing and contributing factors were covered to visualize the reaction medium consisting of E. coli K12 cells, organic sub-fractions formed by cell destruction, and LF surface. LF solar photocatalytic inactivation (SPCI) kinetics revealed the highest inactivation rate in ultrapure water as expected, followed by distilled water (DW), aqueous solution containing anions and cations (WM) and saline solution (SS). Characterization of the released organic matter was achieved by UV-vis and fluorescence spectroscopic techniques as well as organic carbon contents (DOC). Upon SPCI, significant amounts of K+ along with released protein contents were detected expressing cell wall destruction and lysis. Under the specified experimental conditions, in the presence of released intracellular organic and inorganic components via cell lysis, a significant count of E. coli was still present in SS, whereas almost all bacteria were removed in other matrices due to various challenging reasons. Based on the presented data, SPCI of E. coli using LF as a novel photocatalyst was successfully demonstrated as an alternative and promising method for disinfection purposes.

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