Abstract Electronic interactions in donor-π-linker-acceptor systems with barbituric acid as an electron acceptor and possible donor were investigated to screen promising candidates a push–pull character based on experimental quantum chemical studies. The tautomeric properties of 5-benzylidenebarbituric derivatives studied NMR spectra, spectrophotometric determination the pKa values, calculation...

Adipocyte and heart fatty acid binding proteins (A-FABP and H-FABP) are closely related members of the FABP family. Unlike the more distantly related liver FABP, these FABP have been proposed to transfer free fatty acids to model membranes by a collisional mechanism (Wootan, M. G., Bernlohr, D. A., and Storch, J. (1993) Biochemistry 32, 8622-8627; Kim, H. K., and Storch, J. (1992) J. Biol. Chem...

The nature of endogenous acceptor molecules implicated in the membrane-directed synthesis of the polysialic acid (polySia) capsule in Escherichia coli K1 serotypes is not known. The capsule contains at least 200 sialic acid (Sia) residues that are elongated by the addition of new Sia residues to the nonreducing termini of growing nascent chains (Rohr, T. E., and Troy, F. A. (1980) J. Biol. Chem...

Two organic compounds (SC-23=(E)-2-Cyano-3-(2,3-dimethoxyphenyl) acrylic acid and SC-25=(E)-2-Cyano-3-(2,5-dimethoxyphenyl) acrylic acid) involving methoxy groups as the electron donor and cyanoacrylic acid group as the electron acceptor have been investigated for dye sensitized solar cells. They shows a short-circuit current density (Jsc) of 2.08 and 1.81 mA cm-2, an open circuit voltage (Voc)...

Transfer RNA fractions from Saccharomyces lactis and Saccharomyces cerevisiae have been tested for cytokinin activity in the tobacco bioassay. Cysteine tRNA has been identified as a cytokinin-containing tRNA species in S. cerevisiae. Acid hydrolysates of S. lactis tRNA fractions (containing arginine tryptophan, and valine acceptor activities) and S. cerevisiae tRNA fractions (containing alanine...

A fluorosulfoxonium cation and triflic acid were shown to promote ( n + 2) annulations of donor–acceptor cyclopropanes or -butanes with 1,2-dipoles, different activity selectivity but a presumed similar role as (hidden) Brønsted acids.

The previous papers (1-3) and reports from numerous laboratories (4-9) have demonstrated the enzymic synthesis of amino acyl ribonucleic acid derivatives. Studies by Zachau et al. (IO), IIecht et al. (ll), and ourselves (3) have established that each amino acid is linked to a specific polynucleotide chain through an ester linkage with either the 2’or 3’-hydrosyl group of the terminal nucleotide...

Heparin was degraded with nitrous acid to yield carbohydrate-serine compounds with uranic acid located at the terminal, nonreducing position. In addition, a tetrasaccharide with the proposed structure, uronosyl-N-acetylglucosaminyluronosyl-anhydromannose was isolated from heparln by a similar procedure. On digestion with liver @-glucuronidase, between one-third and all of the uranic acid locate...