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| 2. |
- Franzen, Johan, et al.
(författare)
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Regulation of apolipoprotein A1 synthesis in lymph drained rats
- 1987
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Ingår i: Biochimica et Biophysica Acta. - : Elsevier BV. - 0006-3002. ; 918:1, s. 11-15
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Tidskriftsartikel (refereegranskat)abstract
- The effect of lymph diversion on plasma apolipoprotein A-I levels was studied. In lymph fistula rats apolipoprotein A-I levels in plasma stayed constant in spite of a loss of an equivalent of one-half plasma pool of apolipoprotein A-I per day through the lymph fistula. This indicates that synthesis of apolipoprotein A-I increases or that catabolism of apolipoprotein A-I decreases in a compensatory manner as intestinal apolipoprotein A-I is diverted. By using incorporation of [3H]leucine into newly synthesized apolipoprotein A-I it was shown that 2.6-times as much [3H]leucine was incorporated into apolipoprotein A-I in thoracic duct drained animals compared to controls. In experiments in which 125I-labeled HDL was injected intravenously into rats, it was shown that catabolism of HDL and apolipoprotein A-I was not decreased in lymph-drained rats. These data thus suggest that an increased synthesis of apolipoprotein A-I occurs when the intestinal contribution of apolipoprotein A-I diminishes. This is probably due to an increase in liver protein synthesis.
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| 3. |
- Jensen, Elmo, et al.
(författare)
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Cell density dependent uptake of chylomicron remnants in rat hepatocyte monolaayers. Effects of compactin and mevalonic acid.
- 1987
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Ingår i: Biochimica et Biophysica Acta. - : Elsevier BV. - 0006-3002. ; 917:1, s. 74-80
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Tidskriftsartikel (refereegranskat)abstract
- In rat hepatocytes cultured in lipoprotein-deficient serum, the uptake and degradation of chylomicron remnant cholesteryl ester per mg cell protein varies inversely with cell density. Compactin, a competitive inhibitor of 3-hydroxy-3-methylglutaryl-coenzyme-A reductase, stimulates the uptake at all cell densities. Mevalonic acid, on the other hand, can suppress a significant part of the remnant uptake. Chylomicron remnant uptake in hepatocyte cultures can thus be influenced by factors known to regulate the apolipoprotein-BE receptor activity.
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| 4. |
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| 5. |
- Nilsson, Jan-Åke, et al.
(författare)
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Early fledging mortality and the timing of juvenile dispersal in the marsch tit Parus palustris
- 1985
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Ingår i: Ornis Scandinavica. - : JSTOR. - 0030-5693. ; 16, s. 293-298
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Tidskriftsartikel (refereegranskat)abstract
- Family flocks of Marsh Tits Parus palustris in southern Sweden kept together until 11-15 d after fledging and stayed within the former territory of the parents. Mortality in the family flocks was low in one year (1.2-3.6%) but higher in another (18.6%). This level of mortality is compared with post-dispersal mortality in other species of tits. The occurrence of a parent-offspring conflict with regard to when juveniles should disperse is called in question. The level of aggression from parents towards their young was very low. Experimental broods of increased and reduced size stayed equally long within the parental territory, thus refuting the hypothesis that parents force their young to emigrate to avoid local competition for food or the harassment from the begging young. Dispersal of young from a family flock took place over more than one day. Late dis- persers were significantly smalller than their nestmates. This supports the hypothesis that dominant individuals disperse first, while subdominants stay longer in the safety of the parental territory to increase their self-feeding ability,
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| 6. |
- Nilsson, Jan-Åke, et al.
(författare)
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Effects of Dispersal Date on Winter Flock Establishment and Social Dominance in Marsh Tits Parus palustris
- 1988
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Ingår i: Journal of Animal Ecology. - : JSTOR. - 1365-2656 .- 0021-8790. ; 57:3, s. 917-928
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Tidskriftsartikel (refereegranskat)abstract
- (1) We studied the effect of sex, size, age and prior occupancy on social dominance winter flock establishment in a population of marsh tits Parus palustris L. (2) When sex was accounted for, time of establishment in the winter flock-prior occupancy, was critical for the outcome of later aggressive interactions juveniles within flocks. Residents won all interactions with intruders irrespective controlling for sex. (3) Success in, and timing of, establishment were closely linked with hatching lower proportion of late-hatched than early-hatched juveniles became established winter flocks; they also became established later. Even small differences in hatching greatly influenced dominance and the probability of becoming established flock. (4) Since early establishment depends on early hatching, dominance and survival juveniles are determined by how early their parents start breeding. Furthermore, will be strong selection for quick establishment after
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| 7. |
- Nilsson, Jan-Åke, et al.
(författare)
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Incubation feeding as a male tactic for early hatching
- 1988
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Ingår i: Animal Behaviour. - 1095-8282. ; 36:3, s. 641-647
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Tidskriftsartikel (refereegranskat)abstract
- Male marsh tits, Parus palustris, regularly feed their mates from the beginning of nest building until hatching. Over three periods (the 15 days preceding egg formation, egg formation/laying and incubation) the number of food passes by the male to the female increased significantly. There was a significant negative relationship between the frequency with which the male fed the female in the nest during incubation and the length of the incubation period. Female blue tits, Parus caeruleus, experimentally supplied with food in the nestbox during incubation had a significantly shorter incubation period than control females. Clutches of experimentally fed females also tended to hatch more successfully. It is concluded that feeding of the female by the male is a nutritional contribution and that the shorter incubation period and increased hatching success enhance the fitness of both parents. However, the male should balance the benefits against the costs in time and energy and therefore not necessarily work at a maximal level. In accordance with this is the finding that the male's provisioning rate increased when ambient temperatures decreased. Adverse weather may jeopardize the whole or large proportions of the clutch, thereby significantly reducing the benefit from the current breeding attempt.
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| 8. |
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| 9. |
- Sjögren, Anders, et al.
(författare)
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Evaluation of zinc status in subjects with Crohn's disease
- 1988
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Ingår i: Journal of the American College of Nutrition. - 0731-5724. ; 7:1, s. 57-60
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Tidskriftsartikel (refereegranskat)abstract
- Zinc status was evaluated in 30 subjects with Crohn's disease. Intestinal resection had previously been performed in 23 of the subjects. The concentrations of zinc were determined in plasma, erythrocytes, percutaneous muscle biopsies, and in urine collected during 24 hours. The results were compared with those in 19 healthy controls. Most of the patients had a normal zinc status. The levels of zinc were, however, reduced (i.e., less than mean −2 SD for controls) in plasma for five, in erythrocytes for two, and in muscle biopsies for six subjects with Crohn's disease. The mean concentrations of zinc in plasma and erythrocytes were reduced (P less than 0.05), whereas the mean content of zinc in muscle biopsies and the mean urinary excretion of zinc were not significantly different, in subjects with Crohn's disease. The various zinc parameters did not correlate to each other. The results indicate that some subjects with Crohn's disease had an intracellular zinc depletion, which, however, was not reflected by a reduction in levels of zinc in plasma.
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| 10. |
- Sjögren, Anders, et al.
(författare)
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Magnesium and potassium status in healthy subjects as assessed by analysis of magnesium and potassium in skeletal muscle biopsies and of magnesium in mononuclear cells
- 1987
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Ingår i: Magnesium. ; 6:2, s. 91-99
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Tidskriftsartikel (refereegranskat)abstract
- Magnesium and potassium concentrations were determined in plasma, erythrocytes and urine collected during 24 h, and in percutaneous muscle biopsies obtained in 30 healthy subjects. Magnesium was also analyzed in mononuclear cells. Men, compared to women, showed a higher urinary excretion of magnesium (p less than 0.05). The magnesium contents in mononuclear cells correlated significantly with the concentrations of magnesium in muscle biopsies (r = 0.63; p less than 0.001) and with the urinary losses of magnesium (r = 0.40; p less than 0.05). A significant interrelationship between magnesium and potassium was found in striated muscle (r = 0.65; p less than 0.001), and the contents of potassium in muscle biopsies correlated significantly with the levels of potassium in plasma (r = 0.41; p less than 0.05). In a separate study the day-to-day variations for the magnesium and potassium parameters were investigated during 5 consecutive days in 7 healthy subjects. The coefficient of variation for magnesium in mononuclear cells was comparably low (8.0%), considering the wide range between the subjects. This indicates that magnesium in mononuclear cells might be a valuable parameter in longitudinal follow-up studies.
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