Results 71 to 80 of about 144,233 (304)
Knowledge and Management of Aquatic Ecosystems, 1998 L'impact chimique et physique de la sédimentation sur la survie d'oeufs de Salmonidés a été étudié dans la partie amont de deux ruisseaux d'un même bassin à production salmonicole contrastée : le Moulinet qui présente une faible population de truites et ...
MASSA F. +3 more
doaj +1 more source
Isoform-Specific NO Synthesis by Arabidopsis thaliana Nitrate Reductase
Plants, 2019 Nitrate reductase (NR) is important for higher land plants, as it catalyzes the rate-limiting step in the nitrate assimilation pathway, the two-electron reduction of nitrate to nitrite.
Marie Agatha Mohn +2 more
doaj +1 more source
Highly sensitive label-free colorimetric sensing of nitrite based on etching of gold nanorods [PDF]
, 2012 A simple colorimetric method with high sensitivity and selectivity was developed for sensing of nitrite as low as 4.0 mu M by naked eyes, which is based on etching of gold nanorods accompanied by shape changes in aspect ratios (length/width) and a ...
Pan, Dawei +9 more
core +1 more source
Tailored Catalytic Microenvironments Enable Efficient Electrochemical Ammonia Production
Advanced Science, EarlyView.This study shows that Co2+ substitution in inverse spinel FeFeCoO4 constructs an integrated catalytic microenvironment for efficient nitrate‐to‐ammonia reduction. Jahn–Teller distortion activates Fe sites for *H generation, while hard–soft acid–base regulated dual‐metal sites optimize proton‐coupled electron transfer and intermediate adsorption ...
Qi Zhang +8 more
wiley +1 more source
Direct δ‐Lactone Synthesis From Free Alcohols via Photoinduced δ‐C(sp3)–H Carbonylation in Flow
Angewandte Chemie, EarlyView.Herein, we have developed a photo‐flow platform for the δ‐C(sp3)─H carbonylative lactonization of free alcohols with carbon monoxide. The transformation integrates alkoxyl radical generation, selective 1,5‐HAT, CO incorporation, and radical–polar crossover to enable direct access to δ‐lactones from simple alcohol precursors.
Prakash Chandra Tiwari +2 more
wiley +2 more sources
Molecular underpinnings of nitrite effect on CymA-dependent respiration in Shewanella oneidensis
Frontiers in Microbiology, 2016 Shewanella exhibit a remarkable versatility of respiration, with a diverse array of electron acceptors (EAs). In environments where these bacteria thrive, multiple EAs are usually present.
Miao Jin +4 more
doaj +1 more source
Advanced Science, EarlyView.Inspired by Nitrite reductase, a metal–organic framework overlayer is introduced to regulate the interfacial hydration microenvironment on Cu electrodes, enriching hydrated K+ species that act as efficient proton donors. This strategy enables nitrate‐to‐ammonia conversion with near‐unity selectivity at industrial‐level current densities in neutral ...
Yuyin Mao +4 more
wiley +1 more source
Angewandte Chemie, EarlyView.A metal‐free fluorinated ketazine‐linked COF is introduced as an efficient electrocatalyst for nitrate reduction to ammonia under neutral conditions. Fluorine substitution enhances π–π stacking and crystallinity, enabling a Faradaic efficiency of 59.9% and an NH3 yield rate of 1639.9 µmol h−1 mgCOF−1 at −0.9 V versus RHE. This establishes an unexplored
Islam E. Khalil +12 more
wiley +2 more sources
Frontiers in Plant Science, 2015 In the genus Azolla rapid abscission of roots from floating fronds occurs within minutes in response to a variety of stresses, including exposure to nitrite.
Michael F Cohen +5 more
doaj +1 more source
, 2022 A spectrophotometric technique is developed to simultaneously quantify nitrate and nitrite in plasma treated water. The measurement is based on examining the inflection points (wavelengths) in the derivative absorbance of the nitrate or nitrite solution.
Chen, Qiang +4 more
core +1 more source