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  • 1
    Electronic Resource
    Electronic Resource
    Regulation of water transport in the cockroach rectum by the corpora cardiaca-corpora allata system: The requirement for Na+ (1980)
    Springer
    Journal of comparative physiology 138 (1980), S. 357-365 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. The antidiuretic activity of the corpora cardiaca-corpora allata extract is destroyed by heat. 2. Hormone stimulated water transport across the rectal wall will occur only if Na+ is present in the medium bathing the basal (haemocoel) surface. 3. Osmotic flow of water into the rectal lumen can be reversed by the gland extract. 4. Removal of Na+ from the basal surface has no effect on inward or outward osmotic flow of water across the unstimulated rectal wall. 5. The antidiuretic effect of the gland extract is blocked by 2 mM ouabain. 6. Dibutyryl cyclic AMP (1 mM) increases water transport across the rectal wall but is only 50–75% as effective as the gland extract. 7. Recta taken from dehydrated cockroaches transport water more rapidly than those taken from hydrated individuals. The difference disappears if Na+ is omitted from the bathing medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691570
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of the corpora cardiaca-corpora allata system on oxygen consumption in the cockroach rectum: The role of Na+ and K+ (1980)
    Springer
    Journal of comparative physiology 138 (1980), S. 347-355 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Treatment of the isolated rectum ofPeriplaneta americana in vitro with extract prepared from the corpora cardiaca and corpora allata (1 pair combined glands ml−1) increases oxygen uptake by 37%. The response is concentration dependent and appears to be specific to the rectum. 2. If Na+ in the Ringer solution is replaced with isomolar choline the respiration of control tissues is reduced 34%. The level of respiration is not increased by cardiaca-allata extract when Na+ is absent. Ouabain added to the Ringer solution has an effect similar to the omission of Na+. The gland extract partially overcomes the effect of ouabain. 3. Replacement of K+ with choline in the Ringer solution causes an 18% rise in the basal respiration. The absence of K+ does not interfere with the increase in respiration caused by the gland extract. 4. Treatment of the rectum in vitro with 1 mM dibutyryl cyclic 3′,5′-AMP increases respiration by 10%. 5. Treatment of the isolated rectum in vitro with gland extract (1 pair ml−1) increases phosphorylase activity by at least 60%. This effect is completely blocked if Na+ is replaced with choline in the Ringer solution or 2 mM ouabain added. 6. Experiments with open and ligated recta indicate that receptors for the active factor are located on the surface of the rectum facing the haemolymph. The data suggest that the factor may accelerate the rate of Na+ transport by making the interior of the cell more accessible to Na+ in the bathing medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691569
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dispersal ofAleochara bilineata [Col.: Staphylinidae] following inundative releases in urban gardens (1992)
    Springer
    BioControl 37 (1992), S. 55-63 
    Details
    ISSN: 1573-8248
    Keywords: Staphylinidae ; Aleochara bilineata ; beneficial arthropods ; dispersal ; predation ; biological control ; arthropodes utiles ; dissémination ; prédation ; lutte biologique ; Staphylinidae ; Aleochara bilineata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Aleochara bilineata (Gyllenhal) [Coleoptera: Staphylinidae] est un prédateur et un parasite courants de la mouche des racines [Diptera: Anthomyiidae] dans les cultures commerciales et les jardins potagers. Pour évaluer l'activité de dissémination deA. bilineata dans les jardins potagers, on a lâché des coléoptères marqués à raison de 0 et de 1000 en 1987, et de 0, 250, 500, et 1000/jardin potager/semaine en 1988. Trois pour cent des coléoptères ainsi marqués ont été recapturés dans les jardins potagers d'origine. Les populations naturelles deA. bilineata sont très faibles dans tous les jardins potagers et on ne constate aucune augmentation décelable de 1987 à 1988. Les recaptures sont proportionnelles aux taux de lâchers. On n'observe aucune différence significative dans les taux de recapture entre les sexes. Les recaptures et les distributions non uniformes deA. bilineata marqués dans les jardins potagers révèlent qu'ils ont pu voler au moins à 5 km de distance dans les conditions urbaines et choisir certains jardins plutôt que d'autres comme emplacements propices à l'accouplement, la quête de nourriture et l'oviposition.
    Notes: Abstract Aleochara bilineata (Gyllenhal) [Coleoptera: Staphylinidae] is a common predator and endoparasite of root maggot [Diptera: Anthomyiidae] in both commercial crops and home gardens. To test dispersal activity ofA. bilineata in home gardens, marked beetles were released at rates of 0 and 1,000 in 1987 and 0, 250, 500, and 1,000/gardens/wk in 1988. Three percent of marked beetles were recaptured in release gardens. NaturalA. bilineata populations were very small in all gardens, and there was no detectable increase from 1987 to 1988. Recaptures were proportional to release rates. There was no significant difference in recapture rates between sexes. Recaptures and non-uniform distributions of markedA. bilineata in control gardens revealed that they were capable of flying at least 5 km under urban conditions, and of selecting particular gardens as suitable mating, foraging, and oviposition sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372974
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    Paper (German National Licenses)
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