Results 71 to 80 of about 50,424 (297)

Non-toxic total nitrogen determination using a low alkaline persulfate digestion

MethodsX, 2020
Measuring total nitrogen, nitrate, and nitrite is critical for compliance with water safety standards. Previous methods for measuring total nitrogen were hazardous, time consuming, and expensive.
Jacob L. Studt, Ellen R. Campbell, Dianna Westrick, Troy Kinnunen-Skidmore, Aimee H. Marceau, Wilbur H. Campbell   +5 more
doaj  

Production of Nitric Oxide and Nitrosylleghemoglobin Complexes in Soybean Nodules in Response to Flooding

Molecular Plant-Microbe Interactions, 2010
Nitric oxide (NO) has gained interest as a major signaling molecule during plant development and in response to environmental cues. Formation of NO during symbiotic interactions has been reported, but the role and sources of NO in nodules remain unclear.
Cristina Sánchez, Andrew J. Gates, Georgina E. Meakin, Toshiki Uchiumi, Lourdes Girard, David J. Richardson, Eulogio J. Bedmar, María J. Delgado   +7 more
doaj   +1 more source

Pulse radiolysis studies on superoxide reductase from Treponema pallidum [PDF]

FEBS Letters, Elsevier, 2001, 497, pp.171-3, 2015
Superoxide reductases (SORs) are small metalloenzymes, which catalyze reduction of O2*- to H2O2. The reaction of the enzyme from Treponema pallidum with superoxide was studied by pulse radiolysis methods. The first step is an extremely fast bi-molecular reaction of the ferrous center with O2, with a rate constant of 6 x 10 (8) M(-1) s(-1).
arxiv   +1 more source

An investigation into the unusual linkage isomerization and nitrite reduction activity of a novel tris(2-pyridyl) copper complex [PDF]

, 2017
The copper-containing nitrite reductases (CuNIRs) are a class of enzymes that mediate the reduction of nitrite to nitric oxide in biological systems. Metal–ligand complexes that reproduce the salient features of the active site of CuNIRs are therefore of
Roger, Isolda, Senn, Hans M., Sproules, Stephen, Symes, Mark D., Wilson, Claire   +4 more
core   +2 more sources

Antioxidants and Antidiabetic Potential of Polyphenolic Fractions and Crude Extracts of Rhus typhina Fruit, Punica granatum L. Peel, and Terminalia catappa L. Leaves: In Vitro and In Vivo Evaluation

Chemistry &Biodiversity, EarlyView.
This graphical abstract represents the extraction, characterization, and biological evaluation of bioactive compounds derived from specific plant sources. The top section illustrates Rhus coriaria (sumac) fruit, Punica granatum (pomegranate) peel and Terminalia catappa (Indian almond) leaves', which are known for their rich phytochemical composition ...
Mudassir Nazir, Muhammad Abdul Haq, Syed Arsalan Ali, Syed Muhammad Ghufran Saeed, Muhammad Ali Ajmal, Muhammad Nisar, Taseer Ahmed Khan, Alexandros Tsoupras, Shahina Naz   +8 more
wiley   +1 more source

BIOTECHNOLOGY STUDY TO REMOVE NITRATE AND NATRATE BY USING PSEUDOMONAS AERUGINOSA STRAINS ISOLATED FROM WEST WATER IN BAGHDAD CITY [PDF]

مجلة جامعة الانبار للعلوم الصرفة, 2014
This isolated genus has a considerable and important value in biotechnological resources and applications,. These bacteria use much more efficiently the organic substances small molecules units such nitrate, nitrite and used in biosorption for heavy ...
ALI. H HAMMADI, SUFYAN M. SHARTOH, AMAL Y. ALI   +2 more
doaj   +1 more source

Electrochemical titrations and reaction time courses monitored in situ by magnetic circular dichroism spectroscopy [PDF]

, 2011
Magnetic circular dichroism (MCD) spectra, at ultraviolet–visible or near-infrared wavelengths (185–2000 nm), contain the same transitions observed in conventional absorbance spectroscopy, but their bisignate nature and more stringent selection rules ...
Abramson, Allen, Armstrong, Cheesman, Cheesman, Cheesman, Cheesman, Craft, Dooley, Duin, Farrar, Field, Fulop, Gadsby, Gamelin, Gates, George, Hadler, Horio, Hänzelmann, Johnson, Johnson, Johnson, Jones, Julea N. Butt, Justin M. Bradley, Kemp, Kobayashi, Koppenhofer, Larrabee, Male, Marritt, Marritt, Mitić, Mitou, Moir, Myles R. Cheesman, Paes de Sousa, Pauleta, Quintanar, Rasmussen, Richter, Rupnik, Simon, Solomon, Solomon, Solomon, Suharti, Thomson, Thomson, van Gelder, Vickery, Walters   +52 more
core   +1 more source

The existence and significance of a mitochondrial nitrite reductase

Redox Report, 2005
The physiological functions of nitric oxide (NO) are well established. The finding that the endothelium-derived relaxing factor (EDRF) is NO was totally unexpected. It was shown that NO is a reaction product of an enzymatically catalyzed, overall, 5-electron oxidation of guanidinium nitrogen from L-arginine followed by the release of the free radical ...
Andrey V. Kozlov, Hans Nohl, Katrin Staniek   +2 more
openaire   +3 more sources

Two Key Ferredoxins for Nitrogen Fixation Have Different Specificities and Biophysical Properties

Chemistry – A European Journal, EarlyView.
Two ferredoxins, FdC and FdN, are collectively essential for the process of nitrogen fixation by the iron nitrogenase in R. capsulatus. We explore the biophysical factors, through spectroscopic and structural characterizations, which determine ferredoxin functionality and pathway specificity. The structure of FdC (PDB: 9I2A) and model of FdN (AF‐D5ARY6)
Holly Addison, Pascal Pfister, Ana Lago‐Maciel, Tobias J. Erb, Antonio J. Pierik, Johannes G. Rebelein   +5 more
wiley   +1 more source

Structure of superoxide reductase bound to ferrocyanide and active site expansion upon X-ray-induced photo-reduction [PDF]

Structure, 2004, 12, pp.1729-40, 2015
Some sulfate-reducing and microaerophilic bacteria rely on the enzyme superoxide reductase (SOR) to eliminate the toxic superoxide anion radical (O2*-). SOR catalyses the one-electron reduction of O2*- to hydrogen peroxide at a nonheme ferrous iron center. The structures of Desulfoarculus baarsii SOR (mutant E47A) alone and in complex with ferrocyanide
arxiv   +1 more source