Results 221 to 230 of about 10,390 (256)
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Pteridines as Pigments in Amphibians
Science, 1964Extracts of brightly colored skins from nine amphibian species were analyzed chromatographically. In yellow skin in which xanthophores predominated, relatively large quantities of sepiapterin were found, while in red skin which was laden with erythrophores, three drosopterins were most prevalent.
M, OBIKA, J T, BAGNARA
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Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1975
Summary Over the pH range 1–12, pteridine is reduced at the dropping mercury electrode (DME) and pyrolytic graphite electrode (PGE) by way of three polarographic or voltammetric processes. The first, least negative process, is a reversible 2 e -2H + reduction of pteridine to 5,8-dihydropteridine.
David L. McAllister, Glenn Dryhurst
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Summary Over the pH range 1–12, pteridine is reduced at the dropping mercury electrode (DME) and pyrolytic graphite electrode (PGE) by way of three polarographic or voltammetric processes. The first, least negative process, is a reversible 2 e -2H + reduction of pteridine to 5,8-dihydropteridine.
David L. McAllister, Glenn Dryhurst
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Nature, 1949
THERE is a growing biological interest in derivatives of pteridine (I: R1, R2, R3, R4 = H) as a source of antagonists for folic acid (I: R1 = OH; R2 = NH2 ; R4 = H; R3 = CH2.NH.C6H4.CO.NHCH(COOH): CH2CH2COOH-p), since this vitamin plays an important part in the growth of certain bacteria and normal and malignant tissue.
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THERE is a growing biological interest in derivatives of pteridine (I: R1, R2, R3, R4 = H) as a source of antagonists for folic acid (I: R1 = OH; R2 = NH2 ; R4 = H; R3 = CH2.NH.C6H4.CO.NHCH(COOH): CH2CH2COOH-p), since this vitamin plays an important part in the growth of certain bacteria and normal and malignant tissue.
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The biosynthesis of pteridines. Part V. The synthesis of riboflavin from pteridine precursors
Journal of the Chemical Society C: Organic, 1968The synthesis and reactions of various 8-substituted lumazine derivatives are described. In particular, it is shown that these compounds readily undergo hydration, and that the resulting carbinol-amines can take part in reactions which involve ring-opening in the pyrazine ring.
T, Rowan, H C, Wood
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Pteridines. IX. Some pteridine isomers of triamterene
Journal of Medicinal Chemistry, 1968J, Weinstock, R Y, Dunoff
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The Monosubstituted Pteridines
Nature, 1954THE synthesis of a wide variety of monosubstituted pteridines was begun in this Department in 1949, in order to provide less complex pteridines than occur in Nature. We are using the new material to investigate the connexion between constitution and physico-chemical properties (particularly solubility, ionization constants, stability to hydrolysis ...
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Microbiology of Unconjugated Pteridines
Annual Review of Microbiology, 1970H S, Forrest, C, Van Baalen
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