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Seite 1 von 24 Ergebnisse
Induction of deoxyribonucleic Acid synthesis in potato tuber tissue by cutting.
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Incorporation of (32)P-orthophosphate was found in the DNA fraction of aerobically incubated potato discs when examined by methylated albumin kieselguhr column chromatography. The estimation of DNA content of the discs was by a method developed for starchy tissues and showed that the incorporation
Nucleotide pyrophosphatase from potato tubers. Purification and properties.
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Purification of potato tuber nucleotide pyrophosphatase (EC 3.6.1.9) has been modified to furnish a rapid and reproducible procedure yielding a preparation purified 1800-fold and homogeneous in sodium dodecyl sulphate/polyacrylamide gel electrophoresis. The Mr of the enzyme, from gel filtration or
Consumption of raw potato starch alters intestinal function and colonic cell proliferation in the rat.
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Raw potato starch (RPS) may escape complete digestion to enter the colon and produce alterations in colonic function, while cooked potato starch (CPS) is nearly completely digested in the rat small intestine. Effects of RPS and CPS on colonic function [fecal weight, transmit time and thymidine
Hypoxic stress inhibits multiple aspects of the potato tuber wound response.
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Potato (Solanum tuberosum L.) tubers subjected to wounding under hypoxic stress do not synthesize RNA species that are induced in response to wounding in aerobic conditions. Further, wound-response proteins fail to be synthesized when wounded tubers are transferred to hypoxic conditions although
Induction of deoxyribonucleic Acid synthesis in potato tuber slices: role of protein synthesis.
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Timing of protein synthesis which is a prerequisite to DNA synthesis induced in potato tuber tissue (Solanum tuberosum L.) by cut injury has been studied using cycloheximide. The induction of DNA synthesis which was measured by incorporation of (3)H-thymidine was completely inhibited when the
Profiles of pyrimidine biosynthesis, salvage and degradation in disks of potato (Solanum tuberosum L.) tubers.
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In order to obtain general metabolic profiles of pyrimidine ribo- and deoxyribonucleotides in potato (Solanum tuberosum L.) plants, the in situ metabolic fate of various (14)C-labelled precursors in disks from growing potato tubers was investigated. The activities of key enzymes in potato tuber
Response of potato tuber cell division and growth to shade and elevated CO2.
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Plants adjust their sink-organ growth rates, development and distribution of dry matter in response to whole-plant photosynthate status. To advance understanding of these processes, potato (Solanum tuberosum L.) plants were subjected to CO(2) and light flux treatments, and early tuber growth was
Kinetics and localization of wound-induced DNA biosynthesis in potato tuber.
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Tuber wounding induces a cascade of biological responses that are involved in processes required to heal and protect surviving plant tissues. Little is known about the coordination of these processes, including essential wound-induced DNA synthesis, yet they play critical roles in maintaining
Regulation of Bud Rest in Tubers of Potato, Solanum tuberosum L: VII. Effect of Abscisic and Gibberellic Acids on Nucleic Acid Synthesis in Excised Buds.
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The effect of gibberellin A(3) (10(-4)m) and abscisic acid (10(-4)m), applied separately and together, on incorporation of (3)H-thymidine and (3)H-uridine into DNA and RNA of buds from freshly harvested potatoes was investigated. In some treatments apical buds in intact tubers were treated three
Studies of compounds that enhance sphingolipid metabolism in human keratinocytes.
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Several products are known to inhibit the biosynthesis of ceramides and glucosylceramides, but very few stimulate this process. We studied the influence of a hydrolysate of potato proteins (Lipidessence) in vitro on the sphingolipid metabolism of normal human epidermal keratinocytes. By measuring
Heat sensitization of bacterial spores after exposure to ethidium bromide, acriflavine, or daunomycin.
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A 20-min exposure of 10(7) unmodified spores of either Bacillus subtilis NCTC 3610 (harvested from potato-dextrose agar plus manganese) or Bacillus megaterium ATCC 19213 (harvested from nutrient agar plus manganese) per ml to 5 microgram of ethidium bromide per ml did not kill the spores (recovered
Lectin histochemistry in rat thyroid tumours.
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The thyroid tumours and background goiterous and adenomatous lesions induced in rats with diisopropanolnitrosamine (DIPN) plus methylthiouracil (MTU), and regenerative thyroid tissues after wounding were studied by lectin histochemistry. Ten weeks after cessation of the carcinogen treatments,
Histochemical localization of nucleotide pyrophosphatase and cyclic nucleotide phosphodiesterase in seeds and shoots of Triticum.
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The activities of potato nucleotide pyrophosphatase and cyclic nucleotide phosphodiesterase against a common substrate, p-nitrophenyl thymidine 5'-phosphate and its histochemical analogue, AS-BI-naphthyl thymidine 5'-phosphate, were determined with the aid of relatively specific inhibitors, NAD and
The sprout inhibitor 1,4-dimethylnaphthalene induces the expression of the cell cycle inhibitors KRP1 and KRP2 in potatoes.
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The suppression of sprout growth is critical for the long-term storage of potato tubers. 1,4-Dimethylenapthlene (DMN) is a new class of sprout control agent but the metabolic mode of action for this compound has yet to be elucidated. Changes in transcriptional profiles of meristems isolated from
Genotoxicity and subchronic toxicity studies with heated olestra.
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Olestra is a class of sucrose-fatty acid polyesters intended for use as a non-caloric replacement of edible oil. Genotoxicity and subchronic toxicity studies were conducted to determine whether olestra could form genotoxic or toxic breakdown products during simulated commercial use. Heated olestra
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