Results 211 to 220 of about 8,569 (252)
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The excretory role of pteridines in insects.
Journal of Experimental Biology, 19661. Previous work on the storage excretion theory of pteridines is summarized briefly, and the controversial aspects of this theory are discussed. 2. A general model for all nitrogen-containing substances in an animal body is presented.
R. Harmsen
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Pigment Cell Research, 1989
The distribution of GTP-cyclohydrolase I, pyruvoyl tetrahydropterin (dysopropterin) synthase, and pyruvoyl tetrahydropterin reductase in goldfish erythrophores, melanophores, and erythrophoroma cells in vitro has been revealed by specific biochemical ...
M. Masada, J. Matsumoto, M. Akino
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The distribution of GTP-cyclohydrolase I, pyruvoyl tetrahydropterin (dysopropterin) synthase, and pyruvoyl tetrahydropterin reductase in goldfish erythrophores, melanophores, and erythrophoroma cells in vitro has been revealed by specific biochemical ...
M. Masada, J. Matsumoto, M. Akino
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Pteridine studies. Part XXXVI. The action of acid and alkali on pteridine
Journal of the Chemical Society C: Organic, 1968Investigation of the action of acid and alkali on pteridine shows that 2-amino-3-formylpyrazine (IIa) is liberated so quickly that 2-formamido-3-formylpyrazine (IIb), the most likely intermediate, is not detectable. Improved preparative methods for pteridine and 2-amino-3-formylpyrazine are reported.
Adrien Albert, Hiroshi Yamamoto
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Unconjugated pteridines in human milk
Clinica Chimica Acta, 1982Defective de novo synthesis of tetrahydrobiopterin (BH4) has been reported as being responsible for neonatal hyperphenylalaninemia. The presence of BH4 and its derivatives in human milk is confirmed but the vitamin-like effectiveness of the BH4 supplied by human milk appeared doubtful.
Jean-Louis Dhondt+2 more
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Recent Developments in the Chemistry of Pteridines
, 1964The abundant experimental material available on the chenistry of the pteridines, as well as the reports given at the Third International Symposium on Pteridines have been reviewed and the most important results of the past ten years incorporated into the
W. Pfleiderer
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Helvetica Chimica Acta, 2008
AbstractA variety of pyrimidine precursors 12–25 were converted into a series of new 7‐hydroxylumazines (=7‐hydroxypteridine‐2,4(1H,3H)‐diones) 26–35 which functioned as starting materials for the transformation into the corresponding 7‐chlorolumazines 36–45.
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AbstractA variety of pyrimidine precursors 12–25 were converted into a series of new 7‐hydroxylumazines (=7‐hydroxypteridine‐2,4(1H,3H)‐diones) 26–35 which functioned as starting materials for the transformation into the corresponding 7‐chlorolumazines 36–45.
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Three New Pteridines, Hirudinoidines A -C, from Hirudo nipponica WHITMAN
, 2008Three new pteridines, hirudinoidines A – C (1–3, resp.), with novel structural features were isolated from Hirudo nipponicaWhitman, and their structures were elucidated on the basis of extensive spectroscopic analyses and by comparison of their spectral ...
You-bin Li, Weihua Huang, Yu Xiang
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On the proton affinity of pteridine
Journal of Heterocyclic Chemistry, 1974AbstractAll‐valence‐electron and perturbation calculations suggest that pteridine may preferably be protonated at the pyrazine moiety. Correlation between these results and some experimental data is presented.
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Pteridines. IX. Some pteridine isomers of triamterene
Journal of Medicinal Chemistry, 1968Joseph Weinstock, Roberta Y. Dunoff
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Daily variation and effect of dietary folate on urinary pteridines
Metabolomics, 2016Casey Burton, Honglan Shi, Yinfa Ma
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