Results 71 to 80 of about 8,420 (250)
First Synthesis of a Representative, Natural Pterin Glycoside: 2’-O-(α-D-Glucopyranosyl)biopterin [PDF]
, 2009 Glycosylation of N(2)-(N,N-dimethylaminomethylene)-1’-O-(4-methoxybenzyl)-3-[2-(4-nitrophenyl) ethyl]biopterin (14) with the novel donor 4,6-di-O-acetyl-2,3-di-O-(4-methoxybenzyl)-α-D-glucopyranosyl bromide (19) in the presence of silver triflate and ...
Hanaya, Tadashi +2 more
core
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
Insect Conservation and Diversity, Volume 18, Issue 4, Page 593-603, July 2025.The increase in urban lands and the vegetation loss implies changes in the colour of the background which in turn could cause changes in the coloration of individuals. We measured changes in body lightness of damselflies through 19 sites in Central Mexico, with a different degree of urbanisation and a different percentage of native vegetation. We found
Teresa L. Ramos‐Merino +1 more
wiley +1 more source
Tetrahydrobiopterin analogues with NO-dependent pulmonary vasodilator properties [PDF]
, 2011 Reduced NO levels due to the deficiency of tetrahydrobiopterin (BH4) contribute to impaired vasodilation in pulmonary hypertension Due to the chemically unstable nature of BH4 it was hypothesised that oxidatively stable analogues of BR, would be able to ...
Gibson, Colin +4 more
core +1 more source
Journal of Fish Diseases, Volume 48, Issue 7, July 2025.ABSTRACT A 10‐month‐old intact male blue Siamese fighting fish (Betta splendens) was presented to the Purdue University Small Animal Hospital with multiple bilateral masses on the caudal flank. Comprehensive evaluation using impression cytology, histopathology and transmission electron microscopy (TEM) revealed a tumour composed of a mixed‐cell ...
Zi An Yu +2 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
Prediction of Fragmentation Pathway of Natural Products, Antibiotics, and Pesticides by ChemFrag
Journal of Mass Spectrometry, Volume 60, Issue 5, May 2025.ABSTRACT Because the manual interpretation of ESI‐MSn fragmentation spectra is time‐consuming and usually requires expert knowledge, automated annotation is often sought. The fragmentation software ChemFrag enables the annotation of MSn spectra by combining a rule‐based fragmentation and a semiempirical quantum chemical approach.
Jördis‐Ann Schüler +4 more
wiley +1 more source
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
Folate, neopterin and kynurenine pathway in patients with statin therapy
Pteridines, 2016 Statins, widely used antihyperlipidemic drugs, also have immunomodulatory properties independent from their lipid lowering effect. Even with slight modulations in the immune system, pteridine levels can display changes.
Palabiyik Saziye Sezin +9 more
doaj +1 more source