Results 81 to 90 of about 8,074 (264)

An in vitro System for Studying Pteridine Biosynthesis In Drosophila melanogaster

open access: yesPteridines, 1991
In vitro organ culture is a system especially useful for the study of metabolic pathways and their regulation. This report applies such a system to the study of the biosynthesis of pteridines in Drosophila melanogaster, determining in vitro optimal ...
Escriche B., Silva F. J.
doaj   +1 more source

Differential Inhibition of Constitutive and Inducible Nitric Oxide Synthase in Vascular Endothelial Cells by Analogues of Tetrahydrobiopterin [PDF]

open access: yes, 2017
In the vasculature, a physiologic production of nitric oxide (NO) is maintained by endothelial nitric oxide synthase (eNOS). Induction of inducible nitric oxide synthase (ÍNOS) under inflammatory conditions (e.g. septic shock) resulting in high levels of
Linscheid, Philippe   +4 more
core  

PTERIDINES IN PHOTOSYNTHESIS [PDF]

open access: yesProceedings of the National Academy of Sciences, 1958
H. A. Nathan   +2 more
openaire   +3 more sources

Purification and Characterization of Sepiapterin Deaminase from the Silkworm, Bombyx mori

open access: yesPteridines, 1998
Sepiapterin deaminase has been purified approximately 6,000-told from the larval integument of the lemon mutant of the silkworm by several column chromatographic procedures.
Sawada Hiroshi   +5 more
doaj   +1 more source

Method and Apparatus for Cancer Screening [PDF]

open access: yes, 2015
A method and apparatus for detection of pteridine levels in a biological sample using CE-LIF which is useful for early cancer screening involving fully oxidizing pteridine compounds in a sample such as a urine sample, subjecting to CE-LIF to assess ...
Gibbons, Stephen, Ma, Yinfa
core   +1 more source

Pteridines XCVIII. Synthesis and Properties of 1-Methylpterins

open access: yesPteridines, 1993
A series of 1-methyl-pterin derivatives (6-13) have been synthesized by condensation and methylation reactions. The compounds have been characterized by elemental analyses, pKa deterimations and UV spectra.
Pfleiderer Wolfgang
doaj   +1 more source

Pteridines CII Synthesis and Characterization of Dimeric Lumazines

open access: yesPteridines, 1994
Reduction of 1.3-dimethyllumazine (1) by zinc dust in Ac2O/AcOH leads to the formation of 6-7 connected bis-Iumazinyl derivatives. Depending on the reaction conditions either 7 -(5-acetyl-5,6, 7,8-tetrahydro-1.3-dimethyllumazin- 6-yl)-l, 3 ...
Koul Ashok   +2 more
doaj   +1 more source

Possible role for neopterin: control of purine metabolism [PDF]

open access: yes, 1996
There is a marked increase in the level of neopterin in the plasma and urine of people under stress. Neopterin is an intermediate that is made during biopterin synthesis.
Ebong, Samuel John
core   +1 more source

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