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Goulven Cosquer, Fabrice Pointillart, Yann Le Gal, Stéphane Golhen, Olivier Cador, Lahcène Ouahab
The tetrathiafulvalene based 2-immino-pyrazine derivative (TTF-CHN-2-pyz) () was synthesized and characterized. Its radical cation salt ( (+)PF(6)(-)) was prepared as single crystals by electrocrystallisation. (+)PF(6)(-) crystallizes in the triclinic P1 space group. Four 1 : 2 bis(hexafluoroacetylacetonate)M(ii) complexes coordinated with were prepared (M = Mn for , M = Co for , M = Cu for and M = Zn for ). Complex crystallizes in the monoclinic C2/c space group, complexes and crystallize in the triclinic space group P1...
May 14, 2009: Dalton Transactions: An International Journal of Inorganic Chemistry
Brian A. Jackson, Lawrence M. Henling, Jacqueline K. Barton
Rhodium(III) complexes containing 9,10-phenanthrenequinone diimine (phi) ligands have been broadly applied for the construction of DNA binding and recognition molecules, and more recently, derivatives containing the 5,6-chrysenequinone diimine (chrysi) ligand have been shown specifically to recognize base mismatches in DNA. Here the structural properties of [Rh(bpy)(2)(chrysi)]Cl(3) and spectroscopic properties of derivatives are examined and compared to those of phi complexes of rhodium. Although similar in many respects, phi and chrysi complexes display distinctly different protonation behavior...
December 27, 1999: Inorganic Chemistry
K A Lee, M S Kim
Inhibitory activity toward beta-glucosidase was detected in extracts of the lichen, Umbilicaria esculenta. The extract showed strong inhibition of disaccharide hydrolytic enzymes of mold and mammalian origin, but weak or no inhibition of polysaccharide hydrolytic enzymes except glucoamylase and laminarinase. The inhibitor in the extract was very stable, retaining more than 95% of its activity when treated with heat, acid, alkali, and some hydrolytic enzymes. Purified inhibitor was identified as 1-deoxynojirimycin (1,5-dideoxy-1,5-immino-D-glucitol) by NMR spectrometry, which was known to be produced by Streptomyces sp...
November 2000: Canadian Journal of Microbiology
J W Griffin, D C Anthony, K E Fahnestock, P N Hoffman, D G Graham
Accumulations of neurofilaments are observed in a variety of neurological disorders, and their pathogenesis is a fundamental problem of neuropathology. 2,5-Hexanedione (HD) neurotoxicity provides an extensively studied model of axonal neurofibrillary changes in which the pathogenetic mechanisms have been conjectural. Chronic exposure to HD results in neurofilament-filled swellings in the distal regions of large axons of exposed humans and experimental animals. In this report we describe the changes produced by a potent analogue of HD, 3,4-dimethyl-2,5-hexanedione ( DMHD ), in slow axonal transport in the rat sciatic motor axons...
June 1984: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
D Cassel, Z Selinger
Treatment of turkey erthrocyte membranes with cholera toxin caused an enhancement of the basal and catecholamine-stimulated adenylate cyclase [ATP pyrophosphate-lyase (cyclizing), EC] activities. Both of these activities required the presence of GTP. The toxin effect on the adenylate cyclase activity concided with an inhibition of the catecholamine-stimulated guanosinetriphosphatase activity. Inhibition of the guanosinetriphosphatase, as well as enhancement of the adenylate cyclase activity, showed the same dependence on cholera toxin concentrations, and the effect of the toxin on both activities was dependent on the presence of NAD...
August 1977: Proceedings of the National Academy of Sciences of the United States of America
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