Results 21 to 30 of about 58,940 (303)

Nucleophilic Arylation of Halopurines Facilitated by Brønsted Acid in Fluoroalcohol

open access: yesMolecules, 2019
Various aryl-substituted purine derivatives were synthesized through the direct arylation of halopurines with aromatic compounds, facilitated by the combination of triflic acid and fluoroalcohol.
Naoko Takenaga   +7 more
doaj   +1 more source

Determination of association constants between 5 '-guanosine monophosphate gel and aromatic compounds by capillary electrophoresis [PDF]

open access: yes, 2013
Hydro gel formed by 5'-guanosine monophosphate (GMP) in the presence of a potassium ion is expected to exhibit interesting selectivity in capillary electrophoretic separations.
Alberty   +32 more
core   +1 more source

Investigation of 8-Aza-7-Deaza Purine Nucleoside Derivatives

open access: yesMolecules, 2019
Glycosylation of 6-amino-4-methoxy-1H-pyrazolo[3,4-d]pyrimidine and its iodo- and bromo- analogues with the protected ribofuranose and 2′-deoxyribofuranose under different conditions resulted in the synthesis of N9- and N8-glycosylated purine ...
Hang Ren, Haoyun An, Jingchao Tao
doaj   +1 more source

ZZE-Configuration of chromophore ß-153 in C-phycocyanin from Mastigocladus laminosus [PDF]

open access: yes, 1987
The photochemistry of C-phycocyanin has been studied after denaturation in the dark. It shows an irreversible reaction which has characteristics of a Ζ,Ζ,Ε- to Z,Z,Z-isomerization of dihydrobilins. Its amplitude depends on the reaction conditions, with
Bode, W.   +7 more
core   +1 more source

Search of protein kinase CK2 inhibitors based on purine-2,6-diones derivatives [PDF]

open access: yesThe Ukrainian Biochemical Journal, 2017
This work is aimed to the search of protein kinase CK2 inhibitors among the purine-2,6-dione derivatives by molecular docking and biochemical tests. It was found that the most active compound 8-[2-[(3-methoxyphenyl)methylidene]hydrazine-1-yl]-3-methyl-7-(
M. V. Protopopov   +6 more
doaj   +1 more source

A repurposing strategy for Hsp90 inhibitors demonstrates their potency against filarial nematodes [PDF]

open access: yes, 2014
Novel drugs are required for the elimination of infections caused by filarial worms, as most commonly used drugs largely target the microfilariae or first stage larvae of these infections.
AL Petersen   +46 more
core   +2 more sources

Effect of adenine on the synthesis of purine derivatives in wheat seedlings

open access: yesActa Societatis Botanicorum Poloniae, 2015
The effect of adenine and other purine derivatives on the "de novo" purine synthesis was investigated in young wheat schoots. Adenine, adenosine and AMP inhibited strongly this biosynthesis, whereas hypoxanthine had no effect.
Hanna Rybacka
doaj   +1 more source

Atomic mutagenesis of stop codon nucleotides reveals the chemical prerequisites for release factor-mediated peptide release. [PDF]

open access: yes, 2018
Termination of protein synthesis is triggered by the recognition of a stop codon at the ribosomal A site and is mediated by class I release factors (RFs).
Clementi, Nina   +11 more
core   +3 more sources

Pyrazolo[4,3-e][1,2,4]triazines: Purine Analogues with Electronic Absorption in the Visible Region

open access: yesMolecules, 2005
Synthesis of several pryrazolo[4,3-e][1,2,4]-triazines is described. Theabsorption spectrum of some 5-substituted derivatives was found to extend to the visibleregion.
Jacek Wierzchowski   +2 more
doaj   +1 more source

The Origin of Life [PDF]

open access: yes, 1974
The origin of life is in a sense a genetic problem, for, as H. J. Muller pointed out many years ago, the essential attribute that identifies living matter is its capacity to replicate itself and its variants (1). Because this uniquely biological property
Horowitz, N. H., Hubbard, Jerry S.
core   +1 more source

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