Results 51 to 60 of about 1,610 (169)

Fluorescence-based characterisation of selected edible insect species: Excitation emission matrix (EEM) and parallel factor (PARAFAC) analysis

Current Research in Food Science, 2021
Fluorescence spectroscopy coupled with chemometric tools is a powerful analytical method, largely used for rapid food quality and safety evaluations. However, its potential has not yet been explored in the novel food sector.
G. Rossi, J. Durek, S. Ojha, O.K. Schlüter   +3 more
doaj   +1 more source

The pterin molybdenum cofactors.

Journal of Biological Chemistry, 1992
crassa, demonstrated that the inactive apoprotein of nitrate reductase in extracts of the mutant could be reconstituted by the addition of denatured preparations of purified molybdoenzymes from animal, fungal, or bacterial origin. This crucial finding showed that mol- ybdoenzymes contain a dissociable entity fitting the description of a cofactor and ...
K V, Rajagopalan, J L, Johnson
openaire   +2 more sources

Synthesis of Peptides, Peptide Nucleic Acid Components, and Other Biogenic Compounds From a Three‐Component Prebiotic Mixture

Chemistry – A European Journal, Volume 32, Issue 9, 2 March 2026.
High‐energy proton irradiation of a formamide–diaminomaleonitrile–glycine system in the presence of meteorites produces a broad spectrum of biogenic compounds, including nucleobases, nucleosides, peptides, and nucleobase–peptide conjugates, highlighting a chemically plausible prebiotic network.
Bruno Mattia Bizzarri, Rosangela Santalucia, Eleonora Mancin, Mikhail Kapralov, Eugene Krasavin, Raffaele Saladino, Ernesto Di Mauro   +6 more
wiley   +1 more source

A concise treatment of pterins: some recent synthetic and methodology aspects and their applications in molecular sensors

Pteridines, 2018
A concise account of pterins in chemistry and biology and their applications in molecular sensors including their optical spectroscopic properties are described.
Goswami Shyamaprosad, Das Manas Kumar, Sain Dibyendu, Goswami Bhaswati   +3 more
doaj   +1 more source

Identification of Novel Potential Inhibitors of Pteridine Reductase 1 in Trypanosoma brucei via Computational Structure-Based Approaches and in Vitro Inhibition Assays

Molecules, 2019
Pteridine reductase 1 (PTR1) is a trypanosomatid multifunctional enzyme that provides a mechanism for escape of dihydrofolate reductase (DHFR) inhibition. This is because PTR1 can reduce pterins and folates.
Magambo Phillip Kimuda, Dustin Laming, Heinrich C. Hoppe, Özlem Tastan Bishop   +3 more
doaj   +1 more source

Age‐Dependent Variation in Blood Biopterin Peaks Following Oral Tetrahydrobiopterin Administration in Phenylketonuria

Journal of Inherited Metabolic Disease, Volume 49, Issue 2, March 2026.
ABSTRACT The correct diagnosis of tetrahydrobiopterin (BH4, sapropterin dihydrochloride)‐responsive phenylketonuria (PKU) and treatment with BH4 are important for prognosis and quality of life. We examined whether age affects biopterin bioavailability following oral BH4 administration in PKU and whether this influences BH4 responsiveness.
Kana Kitayama, Tomoko Sakaguchi, Noriko Nakano, Daijiro Kabata, Haruo Shintaku, Takashi Hamazaki   +5 more
wiley   +1 more source

Mycochemical Diversity and Therapeutic Potential of Hymenochaetoid Fungi from Central Asia: Regional and Global Perspectives

New Zealand Journal of Botany, Volume 64, Issue 1, March 2026.
Central Asia harbors a rich yet understudied assemblage of wood‐inhabiting Hymenochaetoid fungi. This review delivers the first comprehensive synthesis of 43 poroid species representing 18 genera documented across montane forests, steppes, and xeric habitats.
Yusufjon Gafforov, Milena Rašeta, Sylvie Rapior, Manzura Yarasheva, Oksana Mykchaylova, Rustamjon Allaberdiev, Şule İnci, Dilfuza Berdieva, Arshad Mehmood Abbasi, Shikhnazar Khodjaev, Dian‐Ming Hu, Weijun Yang, Abudujilili Abuduaini, Maria Letizia Taddei, Mengcen Wang, Islomjon Urinboev, Jiajia Chen   +16 more
wiley   +1 more source

Pigments, Chromatophore Structure, and Gene Expression Underlying Colour Polytypy of a Panamanian Poison Frog

Molecular Ecology, Volume 35, Issue 1, January 2026.
ABSTRACT Colour polytypism represents an example of phenotypic diversification shaped by genetic divergence and ecological pressures. Poison frogs of the genus Oophaga (Dendrobatidae) are highly polytypic in coloration, making them an ideal system for investigating the genetic and physiological basis of colour variation.
Vasiliki Mantzana‐Oikonomaki, Giselle Tamayo‐Castillo, Víctor Vásquez‐Cháves, Abel Mora‐Machado, William J. Zamora Ramirez, Roberto Ibáñez, Heike Pröhl, Ariel Rodríguez   +7 more
wiley   +1 more source

Occurrence of Pterin Pigments in Hymenoptera [PDF]

Nature, 1950
IT has been found that pterins exist in tissues of animals belonging to nearly all groups; their occurrence as pigments, however, is restricted to insects and cold-blooded vertebrates1,2. Among Lepidoptera, they are always present in the wing-scales of the Pieridae and appear to be a biochemical characteristic of that natural family3,4.
openaire   +2 more sources

Levodopa Use and Long‐Term Benefit in Different Dystonia Phenotypes

Acta Neurologica Scandinavica, Volume 2026, Issue 1, 2026.
Background Dopaminergic changes have been reported in various forms of dystonia beyond dopa‐responsive dystonia (DRD). Besides DRD, levodopa (LDopa) is generally not considered effective in dystonia and may worsen it. This study assesses the impact of LDopa on different dystonia phenotypes. Objectives The patient database of Tampere University Hospital
Rebekka M. Ortiz, Jari Honkaniemi, Gessica Sala   +2 more
wiley   +1 more source