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Página 1 a partir de 19 resultados
Comparison of fluoride effects on germination and growth of Zea mays, Glycine max and Sorghum vulgare.
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BACKGROUND
Fluorosis is a disease caused by over-exposure to fluoride (F). Argentina's rural lands have higher fluorine content than urban lands. Evidence confirms that plants grown in fluoridated areas could have higher F content. We compared F uptake and growth of crops grown in different F
Influence of moisture, heat, and light stress on hydrogen fluoride fumigation injury to soybeans.
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Soybean (Glycine max (L) Merr.) plants were exposed to a single fumigation with hydrogen fluoride at concentrations sufficient to cause visible injury within 2 days. They were subjected to soil moisture or osmotic stress prior to, during, or after fumigation. Moisture stress before or during
Characterization of Anion Effects on the Nitrate-Sensitive ATP-Dependent Proton Pumping Activity of Soybean (Glycine max L.) Seedling Root Microsomes.
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The ATP-dependent proton-pumping activity of soybean (Glycine max L.) root microsomes is predominantly nitrate sensitive and presumably derived from the tonoplast. We used microsomes to characterize anion effects on proton pumping of the tonoplast vesicles using two distinctly different
Characterization of the Electrogenicity of Soybean (Glycine max L.) Roots : ATP Dependence and Effect of ATPase Inhibitors.
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The ATP-dependence of the membrane potential of soybean (Glycine max L. cv Williams '79) roots was determined by correlating the decrease in ATP levels with the decrease in the membrane potential caused by carbonyl cyanide m-chlorophenylhydrazone (CCCP) or cyanide. The effects of the ATPase
Influence of hydrogen fluoride fumigation on the water economy of soybean plants.
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The influence of hydrogen fluoride fumigation on water economy was studied using soybean (Glycine max [L] Merr.). Fumigation caused partial stomatal closure in 1 hour and practically complete closure within 4 hours. The transpiration rate was greatly reduced by fumigation, while the leaf temperature
Soybean (Glycine max) urease: significance of sulfhydryl groups in urea catalysis.
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The soybean urease (urea amidohydrolase; EC 3.5.1.5) was investigated to elucidate the presence of sulfhydryl (-SH) groups and their significance in urea catalysis with the help of various -SH group specific reagents. The native urease incubated with 5,5'-dithiobis (2-nitrobenzoic acid) (DTNB)
Inhibition of acid phosphatase isoforms purified from mature soybean (Glycine max) seeds.
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The four soybean seed acid phosphatase isoforms AP1, AP2, AP3A and AP3B were competitively inhibited by phosphate, vanadate, fluoride and molybdate, using p-nitrophenylphosphate as substrate. The four isoforms were not significantly affected by compounds that can interact with SH residues or by
Auxin Transport in Suspension-Cultured Soybean Root Cells : II. Anion Effects on Carrier-Mediated Uptake.
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To test the hypothesis that the carrier-mediated component of the indoleacetic acid (IAA) influx involves an electrogenic proton/IAA anion symport, the effects on the IAA influx of salts expected to depolarize the membrane potential were examined in suspension-cultured soybean (Glycine max [L.]
Electron-paramagnetic-resonance studies of leghaemoglobins from soya-bean and cowpea root nodules. Identification of nitrosyl-leghaemoglobin in crude leghaemoglobin preparations.
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1. Leghaemoglobins from soya-bean (Glycine max) and cowpea (Vigna unguiculata) root nodules were purified by chromatography on DEAE-cellulose phosphate columns at pH8.0 and pH5.8, to avoid the relatively low pH (5.2) commonly used to purify these proteins. 2. E.p.r. (electron-paramagnetic-resonance)
Ferric Leghemoglobin in Plant-Attached Leguminous Nodules.
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Leghemoglobin (Lb) is essential for nitrogen fixation by intact leguminous nodules. To determine whether ferric Lb (Lb3+) was detectable in nodules under normal or stressed conditions, we monitored the status of Lb in intact nodules attached to sweet clover (Melilotus officinalis) and soybean
Identification, biochemical characterization, and subcellular localization of allantoate amidohydrolases from Arabidopsis and soybean.
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Allantoate amidohydrolases (AAHs) hydrolize the ureide allantoate to ureidoglycolate, CO(2), and two molecules of ammonium. Allantoate degradation is required to recycle purine-ring nitrogen in all plants. Tropical legumes additionally transport fixed nitrogen via allantoin and allantoate into the
Aluminum Induces Rigor within the Actin Network of Soybean Cells.
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Aluminum is toxic to both plants and animals. Root growth and pollen-tube extension are inhibited after aluminum stress in acidic environments. Incubation of cultured neurons with aluminum results in the formation of neurofibrillar tangles reminiscent of the neural pathology observed in Alzheimer's
Calcium/Calmodulin Activation of Soybean Glutamate Decarboxylase.
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Recently, we provided preliminary evidence for calcium (Ca2+)/calmodulin (CaM) stimulation of plant glutamate decarboxylase (GAD; EC 4.1.1.15). In the present study, a detailed characterization of the phenomenon is described. GAD was partially purified from various soybean (Glycine max L. Merr.)
NADH Oxidase Activity of Plasma Membranes of Soybean Hypocotyls Is Activated by Guanine Nucleotides.
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The activity of an auxin-stimulated NADH oxidase of the plasma membrane of hypocotyls of etiolated soybean (Glycine max Merr.) seedlings responded to guanine and other nucleotides, but in a manner that differed from that of enzymes coupled to the classic trimeric and low molecular weight monomeric
Reduction of ferric leghemoglobin in soybean root nodules.
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Reduction of ferric leghemoglobin to ferrous leghemoglobin in soybean nodules (Glycine max [L.] Merr. cv Woodworth) was studied using a spectrophotometer equipped with an in-cell space diffuse reflectance accessory. Nodule slices prepared and scanned under nitrogen gas showed a ferrous leghemoglobin
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