scholarly journals Photocatalytic degradation and toxicity evaluation of diclofenac by nanotubular titanium dioxide–PES membrane in a static and continuous setup

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16340-16348 ◽  
Author(s):  
K. Fischer ◽  
M. Kühnert ◽  
R. Gläser ◽  
A. Schulze
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Surface Waters ◽  
Toxicity Evaluation ◽  
Inflammatory Drug ◽  
Microfiltration Membrane ◽  
Long Term Stability ◽  
Membrane Performance ◽  
Pes Membrane

Diclofenac is a commonly used anti-inflammatory drug, which has been found in surface waters. TiO2 nanotubes with a polymer microfiltration membrane showed high photocatalytic degradation of diclofenac combined with an excellent membrane performance and long term stability.

scholarly journals A single-cell polony method reveals low levels of infected Prochlorococcus in oligotrophic waters despite high cyanophage abundances

2020 ◽  
Vol 15 (1) ◽  
pp. 41-54 ◽  
Author(s):  
Noor Mruwat ◽  
Michael C. G. Carlson ◽  
Svetlana Goldin ◽  
François Ribalet ◽  
Shay Kirzner ◽  
...  
Keyword(s):  
Surface Waters ◽  
North Pacific ◽  
Lytic Cycle ◽  
Long Term Stability ◽  
Flow Cytometric ◽  
Ecosystem Level ◽  
Flow Cytometric Sorting ◽  
Low Levels ◽  
Intracellular Virus

AbstractLong-term stability of picocyanobacteria in the open oceans is maintained by a balance between synchronous division and death on daily timescales. Viruses are considered a major source of microbial mortality, however, current methods to measure infection have significant methodological limitations. Here we describe a method that pairs flow-cytometric sorting with a PCR-based polony technique to simultaneously screen thousands of taxonomically resolved individual cells for intracellular virus DNA, enabling sensitive, high-throughput, and direct quantification of infection by different virus lineages. Under controlled conditions with picocyanobacteria-cyanophage models, the method detected infection throughout the lytic cycle and discriminated between varying infection levels. In North Pacific subtropical surface waters, the method revealed that only a small percentage of Prochlorococcus (0.35–1.6%) were infected, predominantly by T4-like cyanophages, and that infection oscillated 2-fold in phase with the diel cycle. This corresponds to 0.35–4.8% of Prochlorococcus mortality daily. Cyanophages were 2–4-fold more abundant than Prochlorococcus, indicating that most encounters did not result in infection and suggesting infection is mitigated via host resistance, reduced phage infectivity and inefficient adsorption. This method will enable quantification of infection for key microbial taxa across oceanic regimes and will help determine the extent that viruses shape microbial communities and ecosystem level processes.

scholarly journals Palladium–nickel catalysts based on ordered titanium dioxide nanorod arrays with high catalytic peformance for formic acid electro-oxidation

RSC Advances ◽  
2017 ◽  
Vol 7 (19) ◽  
pp. 11719-11723 ◽  
Author(s):  
Shangfeng Jiang ◽  
Baolian Yi ◽  
Qing Zhao ◽  
Hongmei Yu ◽  
Zhigang Shao
Keyword(s):  
Titanium Dioxide ◽  
Formic Acid ◽  
Nickel Catalysts ◽  
Nanorod Arrays ◽  
Anode Catalyst ◽  
Alloying Effect ◽  
Long Term Stability ◽  
Electro Oxidation ◽  
Mass Activity

Here, a novel DFAFC anode catalyst is presented. Due to the 3D catalytic structure and alloying effect, the mass activity and long-term stability of the Pd2Ni3–TiO2 towards FAO are higher than that of Pd–TiO2 and commercial PdC.

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