Results 161 to 170 of about 3,589 (204)
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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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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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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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Pteridines. IX. Some pteridine isomers of triamterene
Journal of Medicinal Chemistry, 1968J, Weinstock, R Y, Dunoff
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Microbiology of Unconjugated Pteridines
Annual Review of Microbiology, 1970H S, Forrest, C, Van Baalen
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