Results 21 to 30 of about 3,953 (191)
Pteridines, 1999 A series of new 6-substituted 2,4-diaminopteridines (3-23) and pterins (26-43) have been synthesized by nucleophilic displacement reactions at the side chain of 6-bromomethyl-2,4-diaminopteridine (2) and 6- bromomethylpterin (25) using various types of 0-
Traub Hermann, Pfleiderer Wolfgang
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Pteridines, 1998 A simple direct method for the synthesis of lumazine-6,7-diamines (9, 25-27) from uracil-5,6-diamines (10-13) and methyl cyanoformimidate (24) was found.
Abou-Hadeed Khaled, Pfleiderer Wolfgang
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Eye Darkening Under Dehydration Stress in the Neotropical Frog Boana punctata (Schneider, 1799). [PDF]
J Exp Zool A Ecol Integr PhysiolDehydration induces a strong and partially reversible increase in iris pigmentation in the Neotropical frog Boana punctata. The tight relationship between iris darkening and hydration state identifies ocular pigmentation as a simple, non‐invasive physiological biomarker with broad potential for assessing hydric stress in amphibian populations ...
Reques R +5 more
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An Overview of Pterin Analysis in Biological Samples: From Occurrence and Properties to Sample Pretreatment Combined With Hyphenated Separation Techniques. [PDF]
J Sep SciABSTRACT Pterins are a structurally diverse group of biologically active compounds within the pteridine family, with key roles in pigmentation, redox metabolism, light sensing, and cellular signaling across a wide range of organisms. Their quantification in biological samples is analytically demanding due to their high polarity, chemical instability ...
Brejcha J, Bosakova Z.
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Data on urinary pteridines as a discriminator of atherosclerotic risk in patients with diabetes
Data in Brief, 2022 Presented here are the supplemental data of the research article “Urinary pteridines as a discriminator of atherosclerotic risk in patients with diabetes” [1]. These data provide the first information on variables that affect urinary levels of pteridines
Mikio Marumo +2 more
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The biosynthesis of riboflavin and related pteridines [PDF]
, 1961 The evidence in the literature relating to the biosynthesis of riboflavin and of other simpler pteridines is reviewed. Possible intermediates in the transformation of purines into pteridines are discussed and the chemistry of some of these compounds has ...
Neilson, Thomas
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Chemical studies of 8-substituted pteridines [PDF]
, 1964 An account is given of the methods which are at present available for the aynthesis of 8-substituted pteridines and the closely allied 9-substituted isoalloxazine derivatives.
Rowan, Thomas
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Urinary pteridines as a discriminator of atherosclerotic risk in patients with diabetes
Atherosclerosis Plus, 2021 Background and aims: We have recently proposed urinary pteridine level as a useful biomarker of oxidative stress in a general population. However, the significance of urinary pteridines in patients with diabetes is unknown.
Mikio Marumo +2 more
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Animals, 2023 Flesh flies (Diptera: Sarcophagidae) are regarded as significant in medical and veterinary entomology, and their development models can be utilized as considerable markers to ascertain the minimum postmortem interval (PMImin).
Fernand Jocelin Ngando +9 more
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Bicyclic 6-6 Systems: Pteridines [PDF]
, 2022 This article describes the literature on pteridines, covering the period from 2008 to 2020. The physical properties and reactions include photochemistry, substitution at ring nitrogens, nucleophilic substitution at ring carbons, organometallic couplings ...
Mehrnoosh Ostovar +3 more
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