Results 21 to 30 of about 8,569 (252)
Influence of Neopterin on Ciliary Beat Frequency of Human Nasal Epithelial Cells in vitro
Pteridines, 2008 Acute infectious diseases of the respiratory tract are regularly associated with increased concentrations of neopterin in serum and/or urine. Most likely, the pteridine compound is not only a marker of an activated cellular immune system but may exert ...
Neher Andreas +5 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 ...
Christa Körner +6 more
openaire +3 more sources
Development of an HPLC-MS method for the determination of natural pteridines in tomato samples
, 2016 In plants, reduced pteridines are folate biosynthesis intermediates, and the presence of these analytes in biofortification processes is considered crucial.
E. Martín-Tornero +3 more
semanticscholar +1 more source
Dendritic Molecular Baskets for Selective Binding of Toxic Methotrexate
Angewandte Chemie, Volume 137, Issue 9, February 24, 2025.Dendritic molecular baskets are biocompatible cavitands capable of including toxic methotrexate (MTX) in their aromatic cavity. The binding is chemoselective with the complex forming in competitive cell media. With the unique mode of recognition and modular structure, dendritic baskets are leading candidates for developing effective antidotes against ...
Nitesh Kumar +8 more
wiley +2 more sources
Chemosensors, 2023 Pteridines are a group of compounds synthesised by many living organisms that are involved in the metabolism of many cofactors and vitamins. Their concentration in biological fluids may be altered by various pathologies such as cancer or inflammatory ...
Claudia Giménez-Campillo +7 more
doaj +1 more source
Pteridines, 1991 The electronic absorption. fluorescence excitation, and fluorescence emission spectra of a series of pteridines (lumazine, xanthopterin, isoxanthopterin, biopterin) and riboflavin (vitamin B2) were measured at room temperature (298 K) in a number of ...
Aaron J.-J. +8 more
doaj +1 more source
Pteridines, 1995 Treatment of L-biopterin (I) with N,N-dimethyformamide dimethyl- (or diethyl)acetal and then with acetic anhydride in pyridine gave 1',2'-di-O-acetyl-N'-(N,N-dimethylaminomethylene)-L-biopterin (4), which was converted by the Mitsunobu reaction into 3 ...
Hanaya Tadashi +5 more
doaj +1 more source
Molecular Ecology, Volume 34, Issue 15, August 2025.Abstract Colour signals play pivotal roles in different communication systems, and the evolution of these characters has been associated with behavioural ecology, integumentary production processes and perceptual mechanisms of the species involved. Here, we present the first insight into the molecular and histological basis of skin colour polymorphism ...
Juliane P. C. Monteiro +7 more
wiley +1 more source
Pteridines, 1989 A series of new amino acid-tetrahydropterin-conjugates has been synthesized starting from N 2-isobutyryl-6,7- dimethyl-5,6,7,8-tetrahydropterin (7). The amino acids have been attached in form of their esters (10 - 16) via a succinyl spacer to the N-5 ...
Lockart Ronan John, Pfleiderer Wolfgang
doaj +1 more source
Pteridine levels and head weights are correlated with age and colony task in the honey bee, Apis mellifera [PDF]
PeerJ, 2016 Background. The age of an insect strongly influences many aspects of behavior and reproduction. The interaction of age and behavior is epitomized in the temporal polyethism of honey bees in which young adult bees perform nurse and maintenance duties ...
Frank D. Rinkevich +4 more
doaj +2 more sources