Results 61 to 70 of about 6,178 (219)
Differential Inhibition of Constitutive and Inducible Nitric Oxide Synthase in Vascular Endothelial Cells by Analogues of Tetrahydrobiopterin [PDF]
, 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
Molecular Ecology, Volume 35, Issue 1, January 2026.ABSTRACT Colour polytypism represents an example of phenotypic diversification shaped by genetic divergence and ecological pressures. Poison frogs of the genus Oophaga (Dendrobatidae) are highly polytypic in coloration, making them an ideal system for investigating the genetic and physiological basis of colour variation.
Vasiliki Mantzana‐Oikonomaki +7 more
wiley +1 more source
Synthesis of 6-Hydroxymethylpterin α- and β-D-Glucosides [PDF]
, 2010 The key precursor, N(2)-(N,N-dimethylaminomethylene)-6-hydroxymethyl-3-[2-(4-nitrophenyl)ethyl]pterin (11) was efficiently prepared from 2,5,6-triamino-4-hydroxypyrimidine (8) in 5 steps.
Baba, Hiroki +3 more
core +1 more source
Bioinorganic Chemistry and Applications, Volume 2026, Issue 1, 2026.Guanidine‐containing molecules represent a versatile class of nitrogen‐rich compounds whose unique structural and physicochemical features underpin a rich and tunable coordination chemistry. Their capacity to act as strong donor ligands, stabilize a variety of metal centers in different oxidation states, and access multiple coordination modes has ...
Almudena del Campo-Balguerías +4 more
wiley +1 more source
A Modified Microbiological Method for Determination of Folate Levels in Erythrocyte and Plasma
Pteridines, 2007 Pteridines are natural heterocyclic compounds and they are generally divided into two main groups which are denominated as conjugated and unconjugated pteridines.
Sipahi Hande +3 more
doaj +1 more source
Microbial profile of the appendix niche in acute appendicitis: a novel sampling approach
FEBS Open Bio, Volume 15, Issue 12, Page 2001-2020, December 2025.This study utilized a novel sampling method, ERAT (i.e. endoscopic retrograde appendicitis treatment)‐guided lumen aspiration, to obtain samples from the appendix, and shotgun metagenomic sequencing was performed for in situ characterization of the appendix microbiome in patients with acute appendicitis.
Huimin Ma +10 more
wiley +1 more source
First Synthesis of Asperopterin A, an Isoxanthopterin Glycoside from Aspergillus Oryzae [PDF]
, 2013 The key precursor, N-2-(N,N -dimethylaminomethylene)-6-hydroxymethyl-8-methyl-3-[2-(4-nitrophenyl)ethyl]-7-xanthopterin (16) was efficiently prepared from 2,5-diamino-6-methylamino-3H-pyrimidin-4-one (5) and ethyl 3-(tert-butyldimethylsilyloxy)-2 ...
Hanaya, Tadashi, Yamamoto, Hiroshi
core +1 more source
Photo-reduction of Pteridines [PDF]
Nature, 1956 WHEN a solution of 7-hydroxypteridine1 was spotted on a sheet of Whatman No. 1 filter paper, irradiated with ultra-violet light (principally 254 mµ) for 5 min., and developed (by ascending chromatography) in various solvents, two spots appeared. One of these was identical with the starting material (unirradiated material was used as a control on the ...
openaire +2 more sources
Neopterin-induced Suppression of Erythropoietin Production In Vitro
Pteridines, 1995 The production of neopterin increases in several diseases with activation of the ceIlular immune response. As previously shown serum concentrations of neopterin are inversely correlated with blood hemoglobin concentrations in the anemia of hematological ...
Schobersberger W. +5 more
doaj +1 more source
Urinary and Serum Pteridines in Liver Diseases
Pteridines, 1996 The aim of this mini-review is to show the usefulness of pteridines as clinical markers. We assayed urinary neopterin and xanthopterin levels in liver disease. Total pterins were oxidized by active carbon to yield xanthopterin.
Mazda Toshio +2 more
doaj +1 more source