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Página 1 a partir de 25 resultados
Hepatic ornithine decarboxylase induction by potato glycoalkaloids in rats.
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The induction of hepatic ornithine decarboxylase (ODC) activity in rat livers by the potato glycoalkaloids alpha-solanine, alpha-chaconine, and their aglycone solanidine, has been studied. Ip administration of alpha-solanine at 7.5, 15 and 30 mg/kg body weight produced markedly elevated enzyme
Ornithine decarboxylase and arginine decarboxylase activities in meristematic tissues of tomato and potato plants.
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Ornithine decarboxylase and arginine decarboxylase activities were measured in roots and buds of tomato (Lycopersicon esculentum Mill. cv. Pearson ms-35) and potato (Solanum tuberosum cv. Desire) plants. In both tomato and potato, the activity of ornithine decarboxylase was the highest at the root
The purification and properties of the lectin from potato tubers, a hydroxyproline-containing glycoprotein.
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1. Potato lectin has been purified and shown to be a glycoprotein containing about 50% of carbohydrate. Most of the sugar residues (92%) are arabinose; small amounts of galactose, glucose and glucosamine are also present. 2. The most abundant amino acid is hydroxyproline (16% of the residues), 11.5%
Optimisation of conditions for infection of isolated potato protoplasts with potato virus X.
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Conditions for the reproducible infection of potato protoplasts with PVX were determined. Successful virus infection was achieved when potato protoplasts at a concentration of 3 X 10(5) cells/ml were incubated with 20 micrograms/ml PVX and 2 micrograms/ml Poly-L-ornithine (MW 100,000) for 15 minutes
Agrobacteria lacking ornithine lipids induce more rapid tumour formation.
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Ornithine lipids (OLs) are phosphorus-free membrane lipids that are widespread among Gram-negative bacteria. Their basic structure consists of a 3-hydroxy fatty acyl group attached in amide linkage to the α-amino group of ornithine and a second fatty acyl group ester-linked to the 3-hydroxy position
Polyamine metabolism of potato seed-tubers during long-term storage and early sprout development.
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Growth potential of potato (Solanum tuberosum L.) plants is influenced by seed-tuber age. After 24 days of growth, single-eye seedcores from 7-month-old seed-tubers produced 64% more foliar dry matter than those from 19-month-old seed-tubers, reflecting a higher growth rate. This study was initiated
Relation of polyamine biosynthesis to the initiation of sprouting in potato tubers.
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The polyamines putrescine, spermidine, and spermine and their biosynthetic enzymes arginine decarboxylase, ornithine decarboxylase and S-adenosyl-l-methionine decarboxylase are present in all parts of dormant potato (Solanum tuberosum L.) tubers. They are equally distributed among the buds of apical
A lysine accumulation phenotype of ScIpk2Delta mutant yeast is rescued by Solanum tuberosum inositol phosphate multikinase.
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Inositol phosphates and the enzymes that interconvert them are key regulators of diverse cellular processes including the transcriptional machinery of arginine synthesis [York (2006) Biochim. Biophys. Acta 1761, 552-559]. Despite considerable interest and debate surrounding the role of Saccharomyces
Changes in potato phenylpropanoid metabolism during tuber development.
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Phenylpropanoid metabolite and transcript expression during different developmental stages were examined in field grown potatoes. Carbohydrate and shikimic acid metabolism was assessed to determine how tuber primary metabolism influences phenylpropanoid metabolism. Phenylpropanoid concentrations
Fontibacillus solani sp. nov. isolated from potato (Solanum tuberosum L.) root.
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A bacterial strain designated A4STR04(T) was isolated from the inner root tissue of potatoes in Spain. Phylogenetic analysis based on the 16S rRNA gene sequence placed the isolate into the genus Fontibacillus, being most closely related to Fontibacillus panacisegetis KCTC 13564(T) with 99% identity.
A putative Δ1-pyrroline-5-carboxylate synthetase involved in the biosynthesis of proline and arginine in Leptinotarsa decemlineata.
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Delta 1-pyrroline-5-carboxylate synthetase (P5CS) catalyzes the conversion of glutamate (Glu) to Glu semialdehyde (GSA). GSA spontaneously cyclizes to form P5C. P5C is then reduced to proline (Pro) or is converted to ornithine, the intermediate for arginine (Arg) biosynthesis. In the present study,
Inhibitors of tri- and tetra- polyamine oxidation, but not diamine oxidation, impair the initial stages of wound-induced suberization.
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The mechanisms regulating, and modulating potato wound-healing processes are of great importance in reducing tuber infections, reducing shrinkage and maintaining quality and nutritional value for growers and consumers. Wound-induced changes in tuber polyamine metabolism have been linked to the
Novel properties of malarial S-adenosylmethionine decarboxylase as revealed by structural modelling.
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In the malaria parasite, the two main regulatory activities of polyamine biosynthesis, ornithine decarboxylase (ODC) and S-adenosylmethionine decarboxylase (AdoMetDC) occur in a single bifunctional protein. The AdoMetDC domain was modeled using the human and potato X-ray crystal structures as
Serum responsive gene expression mediated by Sp1.
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We compared the Sp1 binding activity of Rat2 fibroblasts in nuclear extracts prepared from quiescent cells and cells stimulated with 20% serum. Increased DNA-binding activity was observed in extracts from serum-stimulated cells when an Sp1 oligonucleotide was used as radiolabeled probe in
[Urea cycle enzymes in rats fed with corn].
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Activities of five urea cycle enzymes, carbamyl phosphate synthetase, ornithine transcarbamylase, argininosuccinate synthetase, argininosuccinase and arginase, were measured in liver of rats fed two types of diet: diet I: raw common corn and, diet II: made of a mixture of corn starch ("maicena"),
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