Results 41 to 50 of about 8,420 (250)
Pigment composition of the bright skin in the poison toad, Melanophryniscus rubriventris (Anura: Bufonidae) from Argentina [PDF]
, 2017 The determination of the basis of skin colour is important to better understand the evolutionary and ecological relevance of colour variation in aposematic species.
Bonansea, Maria Ines +2 more
core
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
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
Prospects for the use of sulfur-containing pteridines in toxic liver damage
Regulatory Mechanisms in BiosystemsThe presented material describes the results of the purposeful search for the novel hepatoprotective agents among synthetic sulfur-containing pteridines. The studied compounds were obtained using previously described synthetic procedures.
N. Lohvinenko +7 more
doaj +1 more source
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
doaj +1 more source
Series of Microporous Redox‐Active Pillared Metal–Organic Frameworks Based On Alloxazine Ligands
ChemistryOpen, Volume 14, Issue 12, December 2025.Two series of robust pillared metal–organic frameworks using a redoactive ligand based on alloxazine and transition metals have been evidenced by XRD. The compounds have high decomposition temperatures, and their sorption properties are measured, revealing relatively low surface areas and a moderate uptake of CO2 and C2H4 at high pressures.
Jaison Casas +5 more
wiley +1 more source
Electronic Structure of Tetrahydropteridine Derivatives
Pteridines, 1999 Recently; the 4-amino analogue of tetrahydrobiopterin was found to be a strong inhibitor of nitric oxide synthase while being bound to the enzyme in a manner similar to the natural cofactor tetrahydrobiopterin.
Reibnegger Gilbert +2 more
doaj +1 more source
Pteridines in the Control of Pigmentation
Journal of Investigative Dermatology, 1997 The influence of UVB irradiation on the metabolic pathway for the production of L-tyrosine from L-phenylalanine in the human epidermis has been examined in 12 healthy volunteers with photo skin types I-VI (Fitzpatrick classification). This metabolic pathway involves the induction of GTP-cyclohydrolase 1 (GTP-CH-1), the rate-limiting enzyme for de novo ...
Schallreuter, Karin U. +4 more
openaire +2 more sources
Applications of QSPR and Machine Learning in Molecular Photonics
Advanced Optical Materials, Volume 13, Issue 33, November 25, 2025.Quantitative structureproperty relationships (QSPR) and machine learning (ML) are transforming photochemistry by enabling pre‐synthetic screening of photoactive molecules. This review outlines advances in data‐driven discovery of optical materials and functional dyes, identifies effective descriptors and models for photophysical processes, and provides
Andrey A. Buglak +2 more
wiley +1 more source
Advanced Science, Volume 12, Issue 42, November 13, 2025.This work demonstrates the distinct roles of the glutamate formiminotransferase (GFT) enzyme in plants. The GFT triggers the conversion of 5‐methyl‐tetrahydrofolate to MeFox in plants, a process distinct from its role as a formiminotransferase in mammals.
Tong Lian +15 more
wiley +1 more source