Results 271 to 280 of about 40,643 (298)
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Direct polarographic determination of pyridoxal in the presence of pyridoxal-5-phosphate
Collection of Czechoslovak Chemical Communications, 1962The determination of pyridoxal in the presence of pyridoxal-5-phosphate may be1 based on the difference between the total wave-height obtained at pH about 9, where both substances give a diffusion-controlled wave and that obtained in acid media, where pyridoxal alone shows a kinetic current2.
O. Manoušek, Petr Zuman
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Activation of DOPA decarboxylase by pyridoxal phosphate
Archives of Biochemistry and Biophysics, 1962Abstract DOPA decarboxylase from rat liver was purified by chromatography on DEAE-Sephadex. The purified enzyme decarboxylates o-tryosine, m-tyrosine, DOPA and 5-hydroxytryptophan at different rates. The pH optimum for all substrates was found to be 7.2. The enzyme has the characteristic absorption spectrum of other pyridoxal enzymes, thus indicating
Jorge Awapara +2 more
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Fluorometric determination of pyridoxal phosphate in enzymes
Analytical Biochemistry, 1969Abstract The pyridoxal phosphate contents of several enzymes have been compared both by fluorometry and by absorption spectrophotometry of the phenylhydrazone, and give results in good agreement. The fluorometric method is as rapid and simple as the spectrophotometric method and in addition is about as sensitive as the best biological assay methods ...
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Pyridoxal Phosphate: a Coenzyme for Histidine Decarboxylase
Nature, 1959ALTHOUGH the role of pyridoxal phosphate as a coenzyme of amino-acid decarboxylases is generally recognized, attempts to demonstrate its participation in the enzymic decarboxylation of histidine have hitherto been unsuccessful ...
S. Ono, P. Hagen
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Inactivation of Rhodanese by Pyridoxal 5′‐Phosphate
European Journal of Biochemistry, 1975Pyridoxal 5′‐phosphate and other aromatic aldehydes inactivate rhodanese. This inactivation reaches higher extents if the enzyme is in the sulfur‐free form. The identification of the reactive residue as an amino group has been made by spectrophotometric determination of the 5′‐phosphorylated pyridoxyl derivative of the enzyme.
Doriano Cavallini +4 more
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Acetylcholinesterase is not inhibited by pyridoxal 5′-phosphate
Biochimica et Biophysica Acta (BBA) - General Subjects, 1986Acetylcholinesterase activity was assayed in the absence and presence of pyridoxal 5'-phosphate. If substrate hydrolysis was measured by the pH-stat method, its rate was not significantly affected by pyridoxal 5'-phosphate. In the spectrophotometric assay, however, this compound led to an apparent decrease in rate.
R. Gentinetta, Urs Brodbeck
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Neuroprotective Effects of Pyridoxal Phosphate and Pyridoxal against Ischemia in Monkeys
Nutritional Neuroscience, 2001Previously, in monkeys undergoing 20 min whole brain ischemia we demonstrated that the activated calpain-induced lysosomal disruption with the resultant leakage of cathepsins B and L, causes neuronal death in the cornu Ammonis (CA) 1 sector on day 5.
Anton B. Tonchev +4 more
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Codecarboxylase Function of 'Pyridoxal Phosphate'
Nature, 1945Six specific amino-acid decarboxylases have now been obtained in a cell-free state from various bacteria1,2,3,4. Of these, the enzymes decarboxylating l(+)-lysine, l(-)-tyrosine, l(+)-arginine and l(+)-ornithine have been resolved into apoenzyme moieties activated by the presence of a common codecarboxylase of which a concentrate has been prepared from
James Baddiley, E. F. Gale
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A comparison of pyridoxal phosphate-cystine and pyridoxal phosphate-homocystine reactions
Archives of Biochemistry and Biophysics, 1970C. De Marco, Augusto Rinaldi
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Plasma pyridoxal phosphate in diabetics
The American Journal of Clinical Nutrition, 1984A Hamfelt, L Soderhjelm
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