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Oldal 1 tól től 62 eredmények
Effect of temperature on removal of iron cyanides from solution by maize plants.
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OBJECTIVE
Cyanide is commonly found in soils and groundwater complexed with iron as ferro- and ferri-cyanide. It is evident that plants are capable of tolerating, transporting, and assimilating iron cyanides. The objectives of this study were to investigate the influence of temperatures on the
Depolarization of the Electrogenic Transmembrane Electropotential of Zea mays L. by Bipolaris (Helminthosporium) maydis Race T Toxin, Azide, Cyanide, Dodecyl Succinic Acid, or Cold Temperature.
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The transmembrane electrical potential of root cells of Zea mays L. cv. W64A in a modified 1x Higinbotham solution was partially depolarized by semipurified toxin obtained from Bipolaris (Helminthosporium) maydis race T. At a given toxin concentration depolarization of Texas cytoplasm cells was much
The effect of cyanide and carbon monoxide on the electrical potential and resistance of cell membranes.
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The rapid reduction in cell electropotentials induced by metabolic inhibitors is strong evidence for an electrogenic ion pump. According to Ohm's law, such a depolarization might be explained by a reduction in electric current, I, with unidirectional transport of a given ion, or an increase in
Liver damage does not increase the sensitivity of mice to cyanide given acutely.
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The major detoxification pathway for cyanide (CN) in many species is a biotransformation to the less toxic thiocyanate (SCN). Hepatic thiosulfate: cyanide sulfurtransferase (rhodanese) is the principal enzyme demonstrating in vitro catalytic activity. Despite the assumed importance of the hepatic
Differences in Michaelis-Menten kinetics for different cultivars of maize during cyanide removal.
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Knowledge of the kinetic parameters, the half-saturation constant (K(m)) and the maximum metabolic capacity (v(max)), is very useful for the characterization of enzymes and biochemical processes. Little is known about rates of which vegetation metabolizes environmental chemicals. It is known,
cDNA clones encoding Arabidopsis thaliana and Zea mays mitochondrial chaperonin HSP60 and gene expression during seed germination and heat shock.
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Mitochondria contain a nuclear-encoded heat shock protein, HSP60, which functions as a chaperonin in the post-translational assembly of multimeric proteins encoded by both nuclear and mitochondrial genes. We have isolated and sequenced full-length complementary DNAs coding for this mitochondrial
Effects of various known and potential cyanide antagonists and a glutathione depletor on acute toxicity of cyanide in mice.
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To compare the protective potencies of a large number of known and potential cyanide antagonists in one stock of mice, groups (N = 10) of male CF-1 Swiss-Webster mice were given a single maximal or near-maximal intraperitoneal injection of each substance. Ethyl maleate, a glutathione (GSH) depletor
Cyanide removal by Chinese vegetation--quantification of the Michaelis-Menten kinetics.
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BACKGROUND
Little is known about metabolism rates of environmental chemicals by vegetation. A good model compound to study the variation of rates among plant species is cyanide. Vascular plants possess an enzyme system that detoxifies cyanide by converting it to the amino acid asparagine. Knowledge
Oxidative C4-demethylation of 24-methylene cycloartanol by a cyanide-sensitive enzymatic system from higher plant microsomes.
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Microsomes isolated from corn embryos (Zea mays) were shown to catalyse the C-4 monodemethylation of 28-[3H],24-methylene cycloartanol 1, leading to the corresponding 4 alpha-methyl sterol, cycloeucalenol 5. An enzymatic assay has been developed for the 4,4-dimethyl sterol 4-demethylase in higher
Active Glucose Transport and Proton Pumping in Tonoplast Membrane of Zea mays L. Coleoptiles Are Inhibited by Anti-H-ATPase Antibodies.
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A tonoplast enriched fraction was obtained from Zea mays L. coleoptiles by isopycnic centrifugation of microsomal membranes in a sucrose step gradient. At the 18/26% interface chloride-stimulated and nitrate-inhibited proton pumping activity coincided with a Mg(2+)-ATP dependent accumulation of
Cytoplasmic free calcium in Riccia fluitans L. and Zea mays L.: Interaction of Ca(2+) and pH?
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In cells of Zea mays (root hairs, coleoptiles) and Riccia fluitans (rhizoids, thalli) intracellular Ca(2+) and pH have been measured with double-barrelled microelectrodes. Free Ca(2+) activities of 109-187 nM (Riccia rhizoids), 94-160 nM (Riccia thalli), 145-231 nM (Zea root hairs), 84-143 nM (Zea
In Vitro Sugar Transport in Zea mays L. Kernels : I. Characteristics of Sugar Absorption and Metabolism by Developing Maize Endosperm.
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Short-term transport studies were conducted using excised whole Zea mays kernels incubated in buffered solutions containing radiolabeled sugars. Following incubation, endosperms were removed and rates of net (14)C-sugar uptake were determined. Endogenous sugar gradients of the kernel were estimated
Differential rhizosphere establishment and cyanide production by alginate-formulated weed-deleterious rhizobacteria.
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The effects of Pseudomonas putida ATH2-1RI/9 and Acidovorax delafieldii ATH2-2RS/1 on rhizosphere colonization, cyanide production, and growth of velvetleaf and corn was examined. When formulated in alginate beads and inoculated onto velvetleaf and corn plants (10(9) CFU/plant), only P. putida
A possible new mechanism involved in ferro-cyanide metabolism by plants.
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OBJECTIVE
Ferro-cyanide is one of the commonly found species at cyanide-contaminated soils and groundwater. Unlike botanical metabolism of KCN via the β-cyanoalanine pathway, processes involved in the plant-mediated assimilation of ferro-cyanide are still unclear. The objective of this study was to
The Involvement of Respiration in Free Radical Processes during Loss of Desiccation Tolerance in Germinating Zea mays L. (An Electron Paramagnetic Resonance Study).
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When germinating Zea mays L. seeds are rapidly desiccated, free radical-mediated lipid peroxidation and phospholipid de-esterification is accompanied by a desiccation-induced buildup of a stable free radical associated with rapid loss of desiccation tolerance. Comparison of the electron paramagnetic
A legteljesebb gyógynövény-adatbázis, amelyet a tudomány támogat
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Írjon be egy tünetet vagy betegséget, és olvassa el azokat a gyógynövényeket, amelyek segíthetnek, beírhat egy gyógynövényt, és megtekintheti azokat a betegségeket és tüneteket, amelyek ellen használják.
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