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  • 1980-1984  (2)
  • 1960-1964
  • 1935-1939
  • Rapport des sexes  (1)
  • open-loop insulin infusion  (1)
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  • 1980-1984  (2)
  • 1960-1964
  • 1935-1939
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Conséquence de la variation des effectifs des femelles de Dinarmus vagabundus, sur le parasitisme de l'un de leurs hôtes Callosobruchus maculatus (1983)
    Springer
    Entomologia experimentalis et applicata 34 (1983), S. 317-325 
    Details
    ISSN: 1570-7458
    Keywords: Pteromalidae ; Dinarmus vagabundus ; Bruchidae ; Callosobruchus maculatus ; Ectoparasite grégaire ; Rapport des sexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary The effect of the density of ♀ parasitoids upon their hosts (Callosobruchus maculatus) was studied by the sex-ratio of the offspring of one, two or three ♀ parasitoids, each put in an experimental box. Each group of females received daily four seeds of Vigna radiata infested by the host; each seed contained on average two host larvae of 18–20 days old. After 24 hours with the parasites, the 4 seeds were removed to separate containers so the parasites emerging from each could be examined. The number of larvae/host increases when two or three ♀ parasitoids (D. vagabundus) attack the same host. The average number of offspring (daughters and sons) during the first 20 days of the reproductive activity rises significantly with the number of ovipositing ♀♀. When the density of ovipositing ♀♀ is increased from one to three, the sex-ratio of the offspring ♂/♀ changes towads the value one, with the proportion of emergent sons increasing more quickly than that of the daughters. The increase of the parasitoid numbers in one host causes a modification of the sexratio, favouring ♂ ♂. In our experimental conditions we find 1) significant increase in emergent daughters in the presence of three ovipositing ♀♀, 2) elevation in number of emergent sons as soon as there is more than one ovipositing ♀. In the presence of only one ovipositing ♀, an average of one ♂ emerges per host, this average production of 0.5 increases in the presence of two ovipositing ♀♀ and is doubled in the presence of three ♀.
    Notes: Abstract Lorsque 2 femelles ou 3 femelles de l'ectoparasite D. vagabundus parasitent conjointement un même lot d'hôtes l'intensité du grégarisme larvaire s'accroît par rapport à celui observé en présence d'une seule femelle pondeuse. Cela se traduit par une augmentation significative du nombre moyen de descendants des 2 sexes mais la production moyenne en fils est toujours très inférieure à celle des filles. Cependant, lorsque la densité de femelles pondeuses passe de 1 à 3, le rapport des sexes mâles/femelles des descendants évolue vers l'unité traduisant une augmentation plus rapide de l'effectif des fils que des filles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186932
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Absence of exercise-induced hypoglycaemia in Type I (insulin-dependent) diabetic patients during maintenance of normoglycaemia by short-term, open-loop insulin infusion (1982)
    Springer
    Diabetologia 23 (1982), S. 337-342 
    Details
    ISSN: 1432-0428
    Keywords: Type I diabetes ; exercise ; open-loop insulin infusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To assess the risk and possible mechanisms of hypoglycaemia during moderate exercise in Type I (insulin-dependent) diabetic patients receiving constant insulin infusion, five insulin-dependent male diabetic patients were exercised 18 h after their last meal and 30 h after their last injection of intermediate acting insulin. Intravenous insulin was initially delivered via a closed-loop infusion system programmed to lower mean blood glucose from 11.3 ± 1.8 to 4.8 ± 0.4 mmol/l over approximately 3.5 h. Blood glucose was then maintained at this level for 4 h. At this time, the closed-loop infusion was discontinued and replaced by an open-loop system. The average amount of insulin infused per min during the 4 h normoglycaemic closed-loop period was calculated and this amount was infused at a constant rate during both a 30 min period of exercise on a bicycle ergometer (approximately 65% maximum oxygen uptake) and a 30 min rest period which followed. Five nondiabetic males served as control subjects. Despite significantly higher free insulin concentrations (p 〈 0.05) and identical preexercise blood glucose concentrations, blood glucose rose during exercise only in the diabetic group (0.5 ± 0.2 mmol/l; p 〈 0.01). Changes in the serum concentrations of lactate, glycerol, glucagon, cortisol, non-esterified fatty acids and growth hormone were similar in the two groups and did not account for the increment of blood glucose in the diabetic patients. Beta-hydroxybutyrate concentrations were, however, higher in the diabetic patients at the onset of exercise (p 〈 0.01) and decreased significantly more than the control subjects during exercise. We conclude that exercise under these conditions in diabetic patients is not attended by hypoglycaemia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00253741
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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