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The goal of this study was the assessment of the influence on both insulin and growth hormone levels in lambs blood of blood meal and Wroclaw product - dry brown livex (modified by whey). Experiments were carried out on 30 young Polish "wielkopolska" lowland - sheep - wool type, aged 3-4 months. Livex and blood meal constituted 2% of forage. Blood samples for radioimmunologic examinations (GH and insulin level determination) were taken 1 hour before feeding, directly before feeding and 1.0, 1.5, 2.0, 3.0, 5.0, 6.0 and 8.0 hours afterwards. During the experiment higher levels of insulin and GH were observed in animals fed with livex and forage mixture than in animals fed with blood meal and forage mixture. Livex caused a bigger body mass increase (mean increase 27.3%) in comparison with animals fed with control forage. Although neither livex nor blood meal are hormone preparations, changes in insulin and growth hormone levels were observed.
The objective of this study was to investigate the effect of two single nucleotide polymorphisms iIn growth hormone (GH) gene on performance traits in pigs. The animals (n= 320) belonged to four groups of commercial crosses being the progeny of crossbred Polish Landrace × Polish Large White sows and Polish Landrace, Polish Large White, Duroc or Pietrain boars. Genotypes of growth hormone gene (GH) were established with PCR-RFLP technique using MspI and HaeII endonucleases.The GH/MspI and GH/HaeII genotypes were found significantly related to the weight of ham, Wright of ham meat and ham content of carcass. Moreover, nearly significant differences between GH/MIPS genotypes were found for mean fat thickness (from five measurements), fat thickness at lower back (point K2) and over the loin, and for loin eye height. The results presented allow to assume that near the analysed mutation the QTLs for performance traits in pigs are located.
The objective of this study was to examine the degradation of short peptides corre­sponding to modified fragments of human growth hormone-releasing hormone by trypsin. Six analogues of pentapeptide 9-13 of human growth hormone-releasing hor­mone containing homoarginine, ornithine, glutamic acid, glycine, leucine or phenyl­alanine residue in position 11, two analogues of hexapeptide 8-13 of human growth hormone-releasing hormone and two analogues of heptapeptide 7-13 of human growth hormone-releasing hormone containing homoarginine or glycine residue in position 11 were obtained. The peptides were subjected to digestion by trypsin and the course of reaction was monitored using HPLC. It was found that the rate of hy­drolysis of the Lys12-Val13 peptide bond depends on the amino-acid residue preceding Lys12 . The extension of the peptide chain towards the N-terminus by introduction of consecutive amino-acid residues corresponding to the human growth hormone-re­leasing hormone sequence accelerates the hydrolysis process. These results may be of assistance in designing new analogues of human growth hormone-releasing hor­mone, more resistant to the activity of proteolytic enzymes.
In this study, favorable carbon-nitrogen ratio for high yields of gibberellic acid (GA₃) production from Pseudomonas sp. was investigated. First of all, optimum carbon (glucose, maltose, sucrose, fructose, lactose) and nitrogen (KNO₃, NH₄C1, NaNO₃, urea, glycine) sources among the others were chosen. The highest yield of GA₃ productivity was found in growth medium supplemented with fructose (168.5 mg/L). NaNO₃ was found as a suitable nitrogen source (141 mg/L). Then, in order to determine the optimum carbon-nitrogen ratio, different concentrations of carbon (from 50 mM to 150 mM) and nitrogen (from 17 mM to 47 mM) sources were added in culture media. As a result, optimum carbon-nitrogen ratio for GA₃ production from Pseudomonas sp. was found to be 100:17 mM.
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