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Showing 1 to 20 of 20 for “"Phosphate esters"”.
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The electrophilicity and chemistry of phosphate esters
A series of phosphate esters containing the E.-nitrophenyl moiety as a leaving group were synthesised and their base catalysed hydrolysis and electron impact-induced fragmentations studied. Heterocyclic ester substituents were present in some of the substrates and in-this sense they were considered …
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A structure-reactivity study of selected phosphate esters
… study of bis(4-nitrophenyl)-8-quinolinyl phosphate (4), 1-naphthyl-bis(4-nitrophenyl) phosphate (5) and 4-nitrophenyl -8-quinolinyl phosphate (5) was undertaken. In compound (4) donor-acceptor nitrogen-phosphorus interactions change the geometry of the molecule from tetrahedral to quasi …
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Numerical models of phosphate esters in the Chattahoochee River
… The model simulated mass transport of tri-butyl phosphate, tri (2-butoxyethyl) phosphate, and tri (2-chloroethyl) phosphate within a reach of the river bounded by Buford Dam and Northern Atlanta. Several potential mechanisms for the removal of the phosphate esters from the water column were …
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Complexation of divalent copper, zinc and calcium ions by phosphate esters in aqueous solution
… One of the most important classes of ligands are phosphate esters. In this thesis I describe the investigation of some phosphate ester-metal ion equilibria. Formation constants for the complexation of p-nitrophenyl phosphate, phenyl phosphate, 1-naphthyl phosphate, α-D-glucose-1'-phosphate, …
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The UV/H2O2 advanced oxidation process in UV disinfection units : removal of selected phosphate esters by hydroxyl radical
In this work, the issue of how to remove phosphate esters from drinking water is examined. From the various treatment processes available, the oxidation of phosphate esters through hydroxyl radical generated by the UV/H202 process applied at a UV disinfection unit was selected for evaluation. The …
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PART I. STEREOELECTRONIC EFFECTS IN PHOSPHATE ESTERS. PART II. PROTON NUCLEAR MAGNETIC RESONANCE STUDY ON THE BINDING OF TRANS-CINNAMALDEHYDE TO ALPHA-CHYMOTRYPSIN.
PART I. STEREOELECTRONIC EFFECTS IN PHOSPHATE ESTERS. PART II. PROTON NUCLEAR MAGNETIC RESONANCE STUDY ON THE BINDING OF TRANS-CINNAMALDEHYDE TO ALPHA-CHYMOTRYPSIN.
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Developmental Toxicity of Organophosphate-Based Flame Retardants
… at least one of the two major classes of organophosphate-based flame retardants (OPFRs) - chlorinated phosphate esters (CPEs) and aryl phosphate esters (APEs). Due to rapid adoption as PentaBDE replacements, organophosphate-based flame retardants (OPFRs) have been detected at concentrations …
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Genetic and Biochemical Characterization of a Phoa-Dependent Pathway for Phosphite Oxidation in Escherichia Coli
… that this enzyme oxidizes phosphite to inorganic phosphate and produces hydrogen gas. Therefore, in addition to the well characterized phosphatase activity, E. coli BAP is also a phosphite-dependent hydrogen-evolving hydrogenase. Examination of alkaline phosphatases from other organisms showed …
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The synthesis and biochemical and pharmacological evaluation of gamma-aminobutyric acid antagonists
… of cage-structured compounds including bicyolic phosphate esters (2,6,7,-Trioxa-l-phosphabicyclo (2,2,2,) octan-l-oxides with suitable 4-substituents) have been shown to be potent a GABA antagonists. These compounds do not act directly on the postsysnaptio GABA receptor site but probably at the …
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Studies on the Metabolism of Plant Cells in Tissue Culture
… to study methods of purifying nucleic acids, phosphate ester and nucleic acid metabolism in cells subjected to nutritional shifts, and problems relating to the control of cell division in plant cells. 2. Cell cultures consisting of single cells, groups of cells and small aggregates were …
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Reactivity studies of phosphoric amides and esters
… (RO) (MeNH)P(O)NHCH₂CH₂Cl and β-chloroethyl phosphates Y(MeO)P(O)OCH₂CH₂Cl, was studied under conditions of electrophilic (Ag+) and basic (NaH) catalysis. 1,3-Substitution by the nitrogen atom of the phosphdramidates, yielding ethylenimine derivatives was found to be the preferred …
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Hydrolysis of alpha-D-glucosamine-l-phosphate
… information on the hydrolysis mechanism of phosphate esters was obtained by studying the kinetics of ∝-D-Glucosamine-1-phosphate.</p><p>∝-D-Glucosamine-1-phosphate was synthesized, an experimental pH-rate profile for the hydrolysis of this phosphate was determined at 100 C.</p><p>It was …
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Multivalent activation in temporary phosphate tethers: A new tether for small molecule synthesis
The use of phosphate esters as temporary tethers, capable of multivalent activation is the broad focus of the dissertation research reported herein. Specifically, the utility of phosphate tethers has been demonstrated through the divalent activation of allylic C2-symmetric monocyclic phosphates. …
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Pathway engineering for the discovery and optimized production of phosphonic acids
… bond, which allow them to mimic phosphate esters and carboxylic acids, making them potential enzyme inhibitors. For the antimalarial phosphonate FR900098, a novel pathway engineering strategy, called enriched library screening, was developed that allows one to home in on top …
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Investigation of the biosynthesis of the phosphonate antibiotics bialaphos and dehydrophos
… activities as a result of their ability to mimic phosphate esters or tetrahedral intermediates formed in enzymatic reactions involved in carboxyl group metabolism. The widespread use in medicine and agriculture of these compounds has resulted in active researches, revealing novel biochemistry …
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Metabolic basis for the preferential utilization of disaccharide, by the cellulose-decomposing bacterium, cellvibrio gilvus (nov. sp.)
… cells grown on cellobiose esterified inorganic phosphate in the presence of glucose or cellobiose showed that these sugars were metabolized to phosphate esters. Relative rates of utilization of both sugars revealed that 130% more cellobiose was used at pH 6.5 and 590% more at pH 7.0. On a molar …
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Phosphorylation of polyglycans, especially glycogen and starch
… both types of polyglucans contain low amounts of phosphate esters whose abundance varies depending on species and organs. Starch is selectively phosphorylated by at least two dikinases (GWD and PWD) at the glucosyl carbons C6 and C3 and dephosphorylated by the phosphatase SEX4 and SEX4-like …