نتایج جستجو برای: pyruvates

تعداد نتایج: 6535  

Journal: :Journal of nutritional science and vitaminology 1977
S K Meghal R M O'Neal R E Koeppe

Rats were fed either a thiamine-deficient diet of diets containing pyrithiamine or oxythiamine. When symptoms of thiamine deficiency appeared, the animals were injected intraperitoneally with [2-14C] pyruvate six to twelve minutes prior to sacrifice. Free glutamic and aspartic acids were isolated from liver and brain and degraded. The results indicate that, in thiamine-deficient or oxythiamine-...

Journal: :Journal of magnetic resonance 2008
Peder E Z Larson Adam B Kerr Albert P Chen Michael S Lustig Matthew L Zierhut Simon Hu Charles H Cunningham John M Pauly John Kurhanewicz Daniel B Vigneron

Hyperpolarized 13C offers high signal-to-noise ratios for imaging metabolic activity in vivo, but care must be taken when designing pulse sequences because the magnetization cannot be recovered once it has decayed. It has a short lifetime, on the order of minutes, and gets used up by each RF excitation. In this paper, we present a new dynamic chemical-shift imaging method that uses specialized ...

Journal: :Journal of bacteriology 1973
T A Elzainy M M Hassan A M Allam

A new nonphosphorylative pathway for gluconate degradation was found in extracts of a strain of Aspergillus niger. The findings indicate that gluconate is dehydrated into 2-keto-3-deoxy-gluconate (KDG), which then is cleaved into glyceraldehyde and pyruvate. 6-Phosphogluconate was not degraded under the same conditions. In addition, KDG was formed from glyceraldehyde and pyruvate. Very weak act...

Journal: :Investigative ophthalmology 1970
D F Marcus T Krupin S M Podos B Becker

Intraocular pressure, blood pH, plasma osmolarily, blood lactate, blood pyruvate, blood pressure, and pulse ivere monitored in 12 human subjects following exercise. Intraocular pressure was found to decrease after exercise. This decrease was associated with a rise of blood lactate and plasma osmolarity and a fall in blood pH. The fall in intraocular pressure after exercise was compared to that ...

Journal: :Journal of bacteriology 2003
Cosima Pelludat Daniela Brem Jürgen Heesemann

The Irp9 protein of Yersinia enterocolitica participates in the synthesis of salicylate, the precursor of the siderophore yersiniabactin. In Pseudomonas species, salicylate synthesis is mediated by two enzymes: isochorismate synthase and isochorismate pyruvate-lyase. Both enzymes are required for complementation of a Yersinia irp9 mutant. However, irp9 is not able to complement Escherichia coli...

Journal: :Bioscience reports 1982
T N Palmer B R Odedra

The allosteric inhibition of M1-type pyruvate kinase from rabbit skeletal muscle by phenylalanine is reciprocally dependent on Mg2+ and phosphoenolpyruvate concentrations. At pH 8, phenylalanine acts as a competitive inhibitor with respect to Mg2+ and phosphoenolpyruvate, and vice versa. Phenylalanine introduces sigmoidicity into the dependence of the reaction velocity on [Mg2+]. In vitro kinet...

Journal: :Physical chemistry chemical physics : PCCP 2006
A Kraynov A Suchopar L D'Souza R Richards

Platinum nanoclusters modified with cinchonidine have been employed as 'quasi-homogeneous' catalysts for the hydrogenation of ethyl pyruvate and have demonstrated exceptional activities while the ee's of these systems are currently inferior to the traditional Pt/Al2O3 heterogeneous system. For the bulk systems it has been shown that the orientation of the modifier on the metal surface is a crit...

Journal: :The Biochemical journal 1975
S Ainsworth N Macfarlane

The paper reports a comparative study of the effects of Mn2+, Ni2+ and Co2+ on the reaction of ADP with phosphoenolypyruvate when catalysed by K+-activated rabbit muscle pyruvate kinase. The activation and subsequent inhibition that occurs as the bivalent ion concentration is increased is taken as evidence that the substrates of the enzyme are phosphoenolypyruvate, uncomplexed ADP and free biva...

Journal: :Biochimica et biophysica acta 1991
R G Duggleby

Measuring the initial velocity is difficult in some enzyme assays where a significant fraction of the substrate is consumed. Here a solution to this problem is proposed; the time to produce a fixed amount of reaction product is measured. This time is inversely proportional to the initial velocity, and is related to the maximum velocity and Michaelis constant by a simple equation and linear plot...

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