نتایج جستجو برای: ammonia synthesis

تعداد نتایج: 434427  

Journal: :The Journal of experimental biology 2007
P A Wright S L Steele A Huitema N J Bernier

The key strategy for coping with elevated brain ammonia levels in vertebrates is the synthesis of glutamine from ammonia and glutamate, catalyzed by glutamine synthetase (GSase). We hypothesized that all four GSase isoforms (Onmy-GS01-GS04) are expressed in the brain of the ammonia-intolerant rainbow trout Oncorhynchus mykiss and that cerebral GSase is induced during ammonia stress. We measured...

Journal: :The Journal of clinical investigation 1993
C H Dejong N E Deutz P B Soeters

Renal glutamine uptake and subsequent urinary ammonia excretion could be an important alternative pathway of ammonia disposal from the body during liver failure (diminished urea synthesis), but this pathway has received little attention. Therefore, we investigated renal glutamine and ammonia metabolism in midly hyperammonemic, portacaval shunted rats and severely hyperammonemic rats with acute ...

Journal: :Synthetic Communications 2021

A one pot synthesis of β-ketonitriles from readily accessible 3-chloropropenals using economically benign iodine, aqueous ammonia and sodium hydroxide solution, employing mild reaction conditions h...

Journal: :Energy and Environmental Science 2023

A planetary boundary analysis of decentralised electrocatalytic ammonia synthesis powered by solar energy reveals its potential and provides regional performance figures merit. Conditions for economic viability are discussed.

Journal: :Bioorganic & medicinal chemistry letters 2004
Pramod S Pandey T Srinivasa Rao

An efficient synthesis of N3,4-diphenyl-5-(4-fluorophenyl)-2-isopropyl-1H-3-pyrrolecarboxamide, a key intermediate for the synthesis of an effective HMG-CoA reductase inhibitor atorvastatin, is described. The synthesis is based on the 1,3-dipolar cycloaddition reaction of mesoionic munchnone (1,3-oxazolium-5-olate) with N1,3-diphenyl-2-propynamide leading to N-benzyl pyrrole, and N-debenzylatio...

Journal: :Nature Energy 2022

Ammonia is an important industrial chemical and also being discussed as a potential energy carrier. Electrifying ammonia synthesis could help to decarbonize the industry, Haber–Bosch process contributes markedly global carbon emissions. A lithium-mediated pathway among most promising ambient-condition electrochemical methods. However, role of metallic lithium its passivation layer, solid electr...

2015
Justin S. J. Hargreaves Richard A. Catlow

Co3Mo3N is one of the most active catalysts for ammonia synthesis; however, little is known about the atomistic details of N2 adsorption and activation. Here we examine whether N2 can adsorb and activate at nitrogen surface vacancies. We have identified the most favorable sites for surface nitrogen vacancy formation and have calculated vacancy formation free energies (and concentrations) taking...

2010
T. Ghoorchi H. Amanlou S. Zerehdaran

Twenty-four Holstein dairy cows were used to evaluate the single and combined effects of different levels of crude protein (CP) and monensin treatment during early lactation on blood metabolites, milk yield and digestion of dairy cows. The experiment was designed as a completely randomized block with a 3×2 factorial arrangement of treatments. The factors were three concentrations of CP suppleme...

Journal: :Biochemistry 2000
X Huang F M Raushel

The heterodimeric carbamoyl phosphate synthetase (CPS) from Escherichia coli catalyzes the formation of carbamoyl phosphate from bicarbonate, glutamine, and two molecules of ATP. The enzyme catalyzes the hydrolysis of glutamine within the small amidotransferase subunit and then transfers ammonia to the two active sites within the large subunit. These three active sites are connected via an inte...

Journal: :American journal of physiology. Renal physiology 2012
Sara M Molinas Laura Trumper Raúl A Marinelli

Mitochondrial ammonia synthesis in proximal tubules and its urinary excretion are key components of the renal response to maintain acid-base balance during metabolic acidosis. Since aquaporin-8 (AQP8) facilitates transport of ammonia and is localized in inner mitochondrial membrane (IMM) of renal proximal cells, we hypothesized that AQP8-facilitated mitochondrial ammonia transport in these cell...

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