Refinar búsqueda
Resultados 1-10 de 1,644
[Fungus control in cereals determined by need: The computer program Epidan]
1988
Stetter, S.
Behovsbestemt svampebekaempelse i korn: Om computerprogrammet Epidan.
1988
Stetter S.
The distribution of lignin in white birch wood as determined by bromination with TEM-EDXA
1988
Saka, S. (Daicel Chemical Industries Ltd., Himeji (Japan). Research Center) | Goring, D.A.I.
Normal levels of vitamin A in tissues of the Syrian hamster (Mesocricetus auratus) determined colorimetrically Texto completo
1988
Robinson, M. E. | Gibbins, A. M Verrinder | Hardy, M. H.
Vitamin A levels in tissues of 20 normal adult hamsters on a standard diet were measured colorimetrically. No significant difference between male and female animals was found for any of the tissues sampled. The mean vitamin A value for blood plasma in 20 animals was 53·4 μg/dl. Mean values for liver, kidneys, flank skin and cheek pouch were 813, 1·29, 1·84 and 1·31 mg/g wet weight, respectively. The vitamin assay was less suitable for small organs such as trachea.
Mostrar más [+] Menos [-]Genetically determined hypercholesterolemia in a rhesus monkey family due to a deficiency of the LDL receptor. Texto completo
1988
A M Scanu | A Khalil | L Neven | M Tidore | G Dawson | D Pfaffinger | E Jackson | K D Carey | H C McGill | G M Fless
A family of rhesus monkeys comprising a sire, a dam, and four male offspring were fed a cholesterol-free Purina Chow diet for several months. The sire, 431-J, and two of the offspring, B-8204 and B-8806, had persistent plasma cholesterol levels in the range of 100-130 mg/dl, whereas the dam, 766-I, and the two other offspring, B-1000 and B-7643, exhibited a marked hypercholesterolemia in the 250-300 mg/dl range associated with an elevation of plasma LDL and apoB. When fed for 12 weeks a diet containing 12.5% lard and 0.25% cholesterol, sire, dam, B-1000 and B-7643 exhibited a marked hypercholesterolemia (500-800 mg/dl range), whereas B-8204 and B-8806 developed only a modest hypercholesterolemia (200-250 mg/dl). All animals were Lp[a]+. Skin fibroblasts from each animal and from control cells were grown in 10% fetal calf serum, transferred to 10% lipoprotein-deficient serum for 48 hr, and then incubated at 4 degrees C or 37 degrees C with 125I-labeled Lp[a]-free LDL. The fibroblasts from dam and offspring B-1000 and B-7643 bound and internalized 125I-labeled LDL less efficiently than control cells. Mathematical analyses of the 4 degrees C binding data indicated that there were no significant differences in LDL binding affinity between test and control cells suggesting that cells from the animals with a spontaneous hypercholesterolemia had a decreased number of LDL receptors. This conclusion was supported by the results of ligand and immunoblot analyses carried out on cell lysates separated by gradient gel electrophoresis. We conclude that a genetically determined LDL receptor deficiency was responsible, in part, for the spontaneous hypercholesterolemia observed in three out of the six family members and that this deficiency accounted for the hyperresponsiveness to a dietary fat and cholesterol challenge by the dam and the two offspring, B-1000 and B-7643. The hyperresponsiveness noted in the sire that had no evidence for LDL-receptor deficiency illustrates that factors other than the LDL receptor were responsible for the hypercholesterolemia attending the fat challenge.
Mostrar más [+] Menos [-]Dynamics of the impedance of vaginal vestibule mucous membrane in inseminated gilts as determined by the Walsmeta MK IV apparatus
1988
Cerovsky, J. | Vinter, P. (Vyzkumny Ustav pro Chov Prasat, Kostelec nad Orlici (Czechoslovakia))
Dynamika impedance sliznice posevni predsine inseminovanych prasnic stanovena pristrojem Walsmeta MK IV.
1988
Cerovsky J. | Vinter P.
Sequence in which the amino acids of fish meal proteins become limiting for the growing rat, as determined by "The Complete Protein Evaluation Method"
1988
Haque, A. | Njaa, L.R. (Bergen Univ. (Norway). Dept. of Nutrition)
The sequences of limiting amino acids in two fish meals were determined in rat growth experiments by the procedure proposed by Schelling (1975) for the complete evaluation of dietary protein (CPE). In preliminary studies the fish meals had been found not to have methionine as the first limiting amino acid. The results showed that histidine, methionine, tryptophan coh threonine were the most limiting amino acids in both meals. For practical purposes histidine and methionine were first co-limiting in both, tryptophan came next in one followed by threonine; in the other the two latter were co-limiting. The further sequences were not clearly identified by the procedure used. Calculations of chemical scores identified methionine, tryptophan and histidine as the most limiting in that order, but limitations in threonine were not detected. The experience gained indicates that the procedure has a potential for detecting the most limiting amino acids in animal protein.
Mostrar más [+] Menos [-]The effect of mother plant nutrition on seed vigour as determined by the seed leachate conductivity in pea (Pisum sativum L.) cultivar "Sprite"
1988
Hadavizadeh, A. | George, R.A.T.
