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Pagina 1 a partire dal 126 risultati
Stability of pyridine-2-aldoxime methiodide. II. Kinetics of deterioration in dilute aqueous solutions.
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How To Excite Nuclear Wavepackets into Electronically Degenerate States in Spin-Vibronic Quantum Dynamics Simulations.
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The excited-state dynamics of two functional Fe-carbene complexes, [Fe(bmip)2]2+ (bmip = 2,6-bis(3-methyl-imidazole-1-ylidene)-pyridine) and [Fe(btbip)2]2+ (btbip = 2,6-bis(3- tert-butyl-imidazole-1-ylidene)pyridine), are studied using the spin-vibronic model. In contrast to the usual projection of
Effects of estradiol, phytoestrogens, and Ginkgo biloba extracts against 1-methyl-4-phenyl-pyridine-induced oxidative stress.
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Oxidative stress has been recently considered as a mediator of nerve cell death in several neurodegenerative diseases. We studied the effect of the parkinsonism-inducing toxine 1-methyl-4-phenyl-pyridine (MPP+) on several parameters of cell distress using native and neuronal PC12 cells. Then, since
Pharmacokinetic and dynamic studies with a new anxiolytic imidazo-pyridine alpidem utilizing pharmaco-EEG and psychometry.
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In a double-blind, placebo-controlled study the pharmacokinetic and pharmacodynamic effects of a new imidazo-pyridine derivative, alpidem (SL80.0342) and the 1,4 benzodiazepine lorazepam were investigated utilizing quantitative EEG and psychometric testing. Ten normal volunteers received randomized
Unimpaired metabolism of pyridine dinucleotides and adenylates in Chinese hamster ovary cells during oxidative stress elicited by cytotoxic doses of copper-putrescine-pyridine.
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Copper-putrescine-pyridine (Cu-PuPy) effectively dismutates superoxide but is also known to produce H2O2 in a redox cycle with glutathione. The treatment of Chinese hamster ovary (CHO) cells with 0.2 mM Cu-PuPy reduced clonogenic survival to 10(-3) in 50 min and caused significant oxidation and
p-Bromophenacyl bromide prevents cumene hydroperoxide-induced mitochondrial permeability transition by inhibiting pyridine nucleotide oxidation.
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Mitochondrial permeability transition is commonly characterized as a Ca2+ -dependent non-specific increase in inner membrane permeability that results in swelling of mitochondria and their de-energization. In the present study, the effect of different inhibitors of phospholipase A2--p-bromophenacyl
Evaluation of four pyridine analogs to characterize 6-OHDA-induced modulation of mGluR5 function in rat brain using microPET studies.
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Micro-positron emission tomography imaging studies were conducted to characterize modulation of metabotropic glutamate subtype-5 receptor (mGluR5) function in a 6-hydroxydopamine (6-OHDA)-induced rat model of Parkinson's disease using four analogical PET ligands: 2-[(11)C]methyl-6-(2-phenylethynyl)
Re-colorization of museum specimens: a modification of Romhanyi's technique based on pyridine/nicotine hemochromogen reactions.
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Romhanyi's technique for preservation and restoration of color in museum specimens is almost unknown outside Hungary. The technique was based on the use of pyridine, nicotine and sodium dithionite (sodium hydrosulphite) for restoring the natural red color of formalin-fixed gross specimens. We
Effects of niacin deficiency on pyridine nucleotide levels and enzyme activities in various organs of young growing quail.
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Three experiments were carried out to determine the effects of feeding a niacin-free diet (NFD) to immature quail. The first two experiments demonstrated that the results were influenced by the age of the birds. Birds placed on test at 4 weeks of age (57 g) had reduced growth rates but did not
Delay of DNA-adduct repair and severe toxicity in xeroderma pigmentosum group A gene (XPA) deficient mice treated with 2-amino-1-methyl-6-phenyl-imidazo [4,5-b] pyridine (PhIP).
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Group-A xeroderma pigmentosum (XPA) gene-deficient mice are defective in nucleotide-excision repair and highly susceptible to ultraviolet-B-, and 9,10-dimethyl-1,2-benz[a]anthracene (DMBA)-induced skin carcinogenesis. In this study, changes of 2-amino-1-methyl-6-phenylimidazo[4,5-b] pyridine
Involvement of precerebellar nuclei in multiple system atrophy.
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In this semiquantitative study based on 26 post-mortem cases, we describe the involvement of precerebellar nuclei in multiple system atrophy (MSA), a progressive degenerative disorder of the human central nervous system characterized by abnormal, argyrophilic and alpha-synuclein immunopositive
In vitro deterioration of rhein anthraquinone in cecal content of rats.
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The influence of the intestinal microbial reduction of rhein anthraquinone on the formation of deterioration products was studied. Therefore [14C]rhein and [14C]rhein anthrone were mixed with sterilized or non-sterilized cecal mass of rats and incubated for 20 hours at 37 degrees C. Extractions with
Pyridine induction of cytochrome P450 1A1, iNOS and metallothionein in Syrian hamsters and protective effects of silymarin.
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An in vivo assessment for the protective effects of silymarin for pyridine toxicity was investigated through cytochrome P450 isoform CYP1A1 and inducible nitric oxide synthase (iNOS) activity prevention. Moreover, the effect of pyridine-induced oxidative stress on metallothionein I-II (MT), a
Exploration of orally available calpain inhibitors. Part 3: Dipeptidyl alpha-ketoamide derivatives containing pyridine moiety.
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Calpain-mediated proteolysis has been implicated as a major process in neuronal cell death including retinal neurological degeneration. The previously reported calpain inhibitor SJA6017 (1) showed oral efficacy in a retinal pharmacological model, but its oral bioavailability was low due to the
Theoretical study on reaction mechanism of ground-state cyano radical with 1,3-butadiene: prospect of pyridine formation.
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The reaction of ground-state cyano radicals, CN(X(2)Σ(+)), with the simplest polyene, 1,3-butadiene (C4H6(X(1)Ag)), is investigated to explore probable routes and feasibility to form pyridine at ultralow temperatures. The isomerization and dissociation channels for each of the seven initial
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