Results 51 to 60 of about 8,074 (264)

Electronic Structure of Tetrahydropteridine Derivatives

open access: yesPteridines, 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

Coloration in a Praying Mantis: Color Change, Sexual Color Dimorphism, and Possible Camouflage Strategies

open access: yesEcology and Evolution, Volume 15, Issue 1, January 2025.
The present study investigates color change, background choice, sexual color dimorphism, and movement rates in a praying mantis, Stagmomantis limbata. Nymphs changed color over development in response to rearing container color. Adults showed sexual color dimorphisms, which could potentially reflect different camouflage strategies.
Leah Y. Rosenheim   +2 more
wiley   +1 more source

Soluble Fas ligand and neopterin in patients with systemic and cutaneous discoid lupus erythematosus

open access: yesPteridines, 2000
Evidence accumulates suggesting that the pathogenesis in systemic lupus erythematosus (SLE) is associated with modulations in the Fas/FasL system. Serum concentrations of soluble Fas ligand (sFasL) were found to be elevated in patients with SLE.
Wirleitner Barbara   +6 more
doaj   +1 more source

Plant Metabolic Engineering for Enhanced Nutrition and Food Security During Climate Uncertainty

open access: yesFood and Energy Security, Volume 14, Issue 1, January/February 2025.
The integration of plant metabolic engineering techniques for enhancing crop nutrition and stress resilience. Central to the process is metabolic pathway enhancement, achieved through gene‐editing tools like CRISPR/Cas9, which enable targeted reprogramming of biosynthetic pathways.
Cengiz Kaya
wiley   +1 more source

Alternative cancer therapy through modeling pteridines photosensitizer quantum yield singlet oxygen production using swarm-based support vector regression and extreme learning machine

open access: yesCogent Engineering
Photodynamic cancer therapy circumvents the major side effects associated with the conventional cancer treatment methods, such as chemotherapy, surgery and exposure to radiation.
Nahier Aldhafferi
doaj   +1 more source

Role of Weak Molecular Interactions in the Mechanism of Action of a Series of Antihelmintics

open access: yesMolecules, 2000
Different physicochemical properties such as solute-solute and solute-solvent interactions, tautomerism, lipophilicity and solubility in water were determined for a serie of 6,7-diaryl-pteridines in order to relate those properties with their nematocide ...
Marisa Santo   +7 more
doaj   +1 more source

Assessing the Association Between Animal Color and Behavior: A Meta‐Analysis of Experimental Studies

open access: yesEcology and Evolution, Volume 14, Issue 12, December 2024.
In animals, genetic variation in color is hypothesized to have pleiotropic effects on a variety of behaviors due to shared dependence on underlying biochemical pathways. We used a phylogenetic meta‐analytic approach to examine the relationship between individual variation in aggressive behavior and variation in multiple colors.
Sarah N. Ruckman   +5 more
wiley   +1 more source

Theoretical study on the relative energies of cationic pterin tautomers

open access: yesPteridines, 2015
Pterins are heterocyclic molecules of biological importance that contain several basic sites. These molecules can be protonated in aqueous solution resulting in a wide variety of structures that differ in their site of protonation and tautomeric form. In
Nekkanti Sindhura, Martin Christopher B.
doaj   +1 more source

Serum vitamins and trace elements in vitiligo patients: A systematic review and meta‐analysis of observational studies

open access: yesJEADV Clinical Practice, Volume 3, Issue 5, Page 1430-1446, December 2024.
Abstract Vitiligo is one of the most common pigmentary skin disorders, which significantly impacts the quality of life. The aetiology and pathophysiology of vitiligo are still unclear, but one of the proposed mechanisms is oxidative damage interrupting melanogenesis.
Fariba Iraji   +2 more
wiley   +1 more source

Usefulness of serum biopterin as a predictive biomarker for childhood asthma control: A prospective cohort study

open access: yesAllergology International, 2019
Background: Pteridines are metabolites of tetrahydrobiopterin, which serves as co-enzyme of nitric oxide synthase. We sought to investigate the usefulness of pteridines as biomarkers for childhood asthma control.
Saki Kasuga   +10 more
doaj  

Home - About - Disclaimer - Privacy