Results 241 to 250 of about 12,700 (282)

Trace metals availability controls terminal electron acceptor utilization inEscherichia coli

Ricciardelli A, de Pins B, Brusca J, Correggia M, Di Iorio L, Cascone M, Giardina M, Castaldi S, Isticato R, Iacono R, Moracci M, Nappi N, Pollio A, Vetriani C, Leone S, Cordone A, Giovannelli D.   +16 more
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A Prebiotic Synthesis of Pterins

Chemistry – A European Journal, 2015
AbstractThe genesis of life on Earth is a hypothesis of evolutionary science that can be, at least partially, tested experimentally. The prebiotic synthesis of cofactors or coenzymes is a poorly explored issue, likely because their formation under plausible prebiotic conditions is not clear.
Marta Ruiz-Bermejo, Margarita R. Marín-Yaseli, Cristina Mompeán   +2 more
openaire   +3 more sources

Photo-Oxidation of Unilamellar Vesicles by a Lipophilic Pterin: Deciphering Biomembrane Photodamage.

Langmuir, 2018
Pterins are natural products that can photosensitize the oxidation of DNA, proteins, and phospholipids. Recently, a new series of decyl-chain (i.e., lipophilic) pterins were synthesized and their photophysical properties were investigated.
M. Vignoni, M. N. Urrutia, Helena C. Junqueira, A. Greer, A. Reis, M. Baptista, R. Itri, Andrés H. Thomas   +7 more
semanticscholar   +1 more source

Quenching of the Singlet and Triplet Excited States of Pterin by Amino Acids

Photochemistry and Photobiology, 2018
Unconjugated oxidized pterins accumulate in the skin of patients suffering from vitiligo and, under UVA irradiation, photosensitize the oxidation of amino acids.
C. Castaño, Mariana P. Serrano, Carolina Lorente, C. Borsarelli, Andrés H. Thomas   +4 more
semanticscholar   +1 more source

Inhibition of xanthine oxidase by pterins

Free Radical Research, 1998
The effect of a panel of pterins on xanthine oxidase was investigated by measuring formation of urate from xanthine as well as formazan production from nitroblue tetrazolium. The pterin derivatives, depending on their chemical structure, decreased urate as well as formazan generation: 200 microM neopterin and biopterin suppressed urate formation (90 ...
Irene Wede, Z Z Altindağ, Helmut Wachter, Dietmar Fuchs, Bernhard Widner   +4 more
openaire   +3 more sources

In situ detection of pterins by SERS

The Analyst, 2009
Surface enhanced Raman scattering (SERS) has been used to detect specific pterin molecules at sub-nanomolar concentrations. SERS is fast becoming a widely used technique for the sensitive and specific detection of multiple analytes. The information-rich and concentration-dependent spectra obtained from SERS make the technique ideally placed for high ...
Stevenson, Ross, Stokes, Robert J., MacMillan, Donna, Armstrong, David, Faulds, Karen, Wadsworth, Roger, Kununthur, Suma, Suckling, Colin J., Graham, Duncan   +8 more
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Lipophilic Decyl Chain-Pterin Conjugates with Sensitizer Properties.

Molecular Pharmaceutics, 2017
A new series of decyl chain [-(CH2)9CH3] pterin conjugates have been investigated by photochemical and photophysical methods, and with theoretical solubility calculations. To synthesize the pterins, a nucleophilic substitution (SN2) reaction was used for
M. Vignoni, N. Walalawela, S. Bonesi, A. Greer, Andrés H. Thomas   +4 more
semanticscholar   +1 more source

Pterins in patients with rett syndrome

American Journal of Medical Genetics, 1986
We have found normal concentrations of neopterin, monapterin, isoxanthopterin, biopterin and pterin in the urine of 10 patients with Rett syndrome, and normal values for total biopterin and neopterin in the blood of 4 subjects. Thus, there is no biochemical evidence of a generalized tetrahydrobiopterin deficiency in this syndrome.
A. Niederwieser, C. A. Haenggeli, L. Kierat, John M. Opitz, James F. Reynolds, Eugen Boltshauser, Eugen Boltshauser   +6 more
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Analysis and clinical significance of pterins

Journal of Chromatography B: Biomedical Sciences and Applications, 1988
This review briefly describes the biochemistry of pterins, their involvement in pathological processes and the use of pterin measurement in diagnosis and monitoring of disease. Chromatographic and other methods of pterin analysis are detailed with particular emphasis being placed on the need for correct sample collection and handling.
David W. Howells, Keith Hyland
openaire   +3 more sources

Mechanistic Insights into C-H Oxidations by Ruthenium(III)-Pterin Complexes: Impact of Basicity of the Pterin Ligand and Electron Acceptability of the Metal Center on the Transition States.

Journal of the American Chemical Society, 2016
A ruthenium(II) complex, [Ru(dmdmp)Cl(MeBPA)] (2) (Hdmdmp = N,N-dimethyl-6,7-dimethylpterin, MeBPA = N-methyl-N,N-bis(pyridylmethyl)amine), having a pterin derivative as a proton-accepting ligand, was synthesized and characterized. Complex 2 shows higher
Hiroumi Mitome, Tomoya Ishizuka, Hiroaki Kotani, Y. Shiota, K. Yoshizawa, Takahiko Kojima   +5 more
semanticscholar   +1 more source