Results 71 to 80 of about 6,178 (219)

Synthesis of 6β-N(5)-Methyl-5,6,7,8-tetrahydro-L-biopterin [PDF]

, 2017
Summary 6β-N(5)-methyl-5.6J,8-tetrahydro-L-biopterin·2 HC1. a new derivate of biological interest, was synthesized from 6β-5,6,7,8-tetrahydro-L-biopteril·2 HC1 and characterized.
Bosshard, Rene, Heizmann, Claus W., Viscontini, Max   +2 more
core  

First Synthesis of a Natural Isoxanthopterin Glycoside, Asperopterin-A [PDF]

, 2012
The key precursor, N-2-(N,N-dimethylaminomethylene)-6-hydroxymethy1-8-methyl-3[2-(4-nitrophenypethyl]-7-xanthopterin (9) was efficiently prepared from 2,5-diamino-6-methylam1no-3H-pyrimidin-4-one (3) and ethyl 3-(tert-butyldimethylsilyloxy)-2 ...
Ejiri, Kazumasa, Hanaya, Tadashi, Yamamoto, Hiroshi   +2 more
core   +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, Girgin Gozde, Asci Ali, Demirelli Selami, Uslu Abdulkadir, Karakelleoglu Sule, Akcay Fatih, Aksakal Enbiya, Sahin Gonul, Baydar Terken   +9 more
doaj   +1 more source

Frailty status in older adults is related to alterations in indoleamine 2,3-dioxygenase 1 and guanosine triphosphate cyclohydrolase I enzymatic pathways [PDF]

, 2017
Original studyXunta de Galicia; ED431B 2016/013Xunta de Galicia; GPC2014/082Xunta de Galicia; IN607C 2016 ...
Fuchs, Dietmar, Gostner, Johanna, Laffon, Blanca, Lorenzo-López, Laura, Marcos Pérez, Diego, Maseda, Ana, Millán-Calenti, José Carlos, Pásaro, Eduardo, Strasser, Barbara, Sánchez-Flores, María, Valdiglesias, Vanessa   +10 more
core   +2 more sources

Characterization of Underivatized Pterins by Laser Desorption Fourier Transfonn Mass Spectrometry

Pteridines, 1993
Laser desorption FfMS provides a powerful method for examining the structures of underivatized pteridines. (M + Na)+ and (M + K)+ ions are generated by laser desorption and can be used to determine molecular weights. The negative ion spectra provide more
Jacobson K. Bruce, Hettich Robert L.
doaj   +1 more source

Multiple Scaly Patches on the Scalp

JEADV Clinical Practice, Volume 5, Issue 1, Page 292-293, March 2026.
Feng‐Li Xu, Li‐Wen Zhang
wiley   +1 more source

Synthesis, structure and photophysical properties of novel thiazolo[2,3-b]pteridines

Acta Chimica Slovenica
A one-pot synthesis of a series of thiazolo[2,3-b]pteridines, along with an alternative step-by-step procedure, has been developed. The regioselectivity of the heterocyclization was determined using a combination of physicochemical methods, including X ...
Daryna Kyrylova, Oleksii Voskoboinik, Anatolii Tatarets, Liubomyr Havryshchuk, Svitlana Shishkina, Sergiy Okovytyy, Serhii Kovalenko   +6 more
doaj   +1 more source

6-Acetonylisoxanthopterin: A Potent Inhibitor of Sepiapterin Reductase

Pteridines, 1991
The inhibitory effect of 6-/7-substituted (2'-oxo) pteridines and ichthyopterin was examined for sepiapterin reductase. 6-Acetonylisoxanthopterin and 6-acetonyl-2,4-diamino-7-hydroxypteridine showed pronounced competitive inhibitory effects to ...
Nakanishi A., Goto M., Katoh S., Sueoka T.   +3 more
doaj   +1 more source

Tetrahydrobiopterin Deficiency: From Phenotype to Genotype [PDF]

, 2017
As a result of the selective screening worldwide during the last 18 years, approximately 250 patients with tetrahydrobiopterin deficiency were discovered.
Blau, Nenad, Dhondt, Jean-Louis, Heizmann, Claus W., Thöny, Beat   +3 more
core  

An in vitro System for Studying Pteridine Biosynthesis In Drosophila melanogaster

Pteridines, 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