Results 151 to 160 of about 1,118 (199)
Heterochromatin and ribosomal genes inAsellus aquaticus (Crust. Isop.)
Chromosome Research, 1996 In the present investigation chromosomal preparations of Asellus aquaticus were sequentially stained with chromomycin A3 to reveal the heterochromatic areas, hybridized in situ with rDNA probes in order to map the ribosomal genes and finally silver stained to check the transcriptional activity of these genes.
BARZOTTI R. +2 more
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Physiology of the Heart of Asellus aquaticus L.
Nature, 1954WORK on this subject was carried out some years ago, on nearly three hundred intact individuals and heart preparations, the latter consisting of heart, pericardium and dorsal body-wall of the thoracic region. The heart-rate of an average (10 mm.) individual at summer temperature was 180–200 per min., but heart-beat was interrupted for short periods ...
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Tolerance to lead in the freshwater isopod asellus aquaticus
Water Research, 1978Abstract Samples of the fresh-water crustacean Asellus aquaticus were taken from three sites in the River Trent basin, subjected to different amounts of lead pollution. The survival rate of large and small animals were compared experimentally in a series of different concentrations of lead.
J FRASER, D PARKIN, E VERSPOOR
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Size and Mating in Asellus aquaticus (Crustacea: Isopoda)
Zeitschrift für Tierpsychologie, 2010The paper examines sexual selection of size in the fresh-water isopod Asellus aquaticus. This species has a period of pre-copulatory mate guarding. We compared the sizes of breeding with non-breeding individuals through the breeding season, and studied assortative mating for size, the relation between male size and ability to take over ♀♀ from other ♂♂,
Mark Ridley, David J. Thompson
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Protein synthesis during spermatogenesis of Asellus aquaticus
Experimental Cell Research, 1971Abstract A study has been carried out on the spermatogenetic and nurse cells of the testicle of Asellus aquaticus for the purpose of elucidating the composition and synthesis of the nuclear histonic and non-histonic proteins. Cytochemical and autoradiographical techniques were used after the injection of radioactive precursors.
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Acclimation to lead in the freshwater isopod Asellus aquaticus
Oecologia, 1980Some populations of the isopod Asellus aquaticus from polluted rivers are tolerant to lead. Here it is shown that nontolerant animals from an unpolluted site can be made tolerant by laboratory exposure to low levels of the metal, and it is suggested that naturally occurring tolerance may be achieved by acclimation.
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Ultrastructure of the maxillary gland of Asellus aquaticus (crustacea, isopoda)
Journal of Morphology, 1990AbstractAsellus aquaticus is a freshwater isopod with an unusually long excretory duct of the maxillary gland. The ultrastructure of this gland is described in detail for the first time. Only one comparable description of an isopod excretory gland has been published until now (for a marine species). The gland is composed of an end sac (coelomosac) with
Uwe, Walter, Johann Wolfgang, Wägele
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Accumulation of aluminium by the freshwater crustacean Asellus aquaticus in neutral water
Environmental Pollution, 1999This study examined the accumulation of aluminium (Al), mostly as the insoluble (Al(OH)(3)) species, by the freshwater crustacean Asellus aquaticus at neutral pH. Animals were exposed to a range of Al concentrations (5-356 microg l(-1)) in three experiments.
R, Elangovan +4 more
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The ultrastructure of the heart of Oniscus asellus L. and Asellus aquaticus L. (Crustacea, Isopoda)
Cell and Tissue Research, 1981The endocardium of Oniscus asellus L. and Asellus aquaticus L. consists of lipid cells. The epicardium consists of a layer of cells with a vesiculated cytoplasm covered by a thick extracellular fibrous sheet. The myocardium is a single layer of cells, the sarcolemma invaginates at Z disc level forming transverse tubules, and longitudinal tubules branch
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ISOPOD (ASELLUS AQUATICUS) SIZE AND ACANTHOCEPHALAN (ACANTHOCEPHALUS LUCII) INFECTIONS
Journal of Parasitology, 2007We examined the effect of isopod size and age on the success of an acanthocephalan infection and on the effects of that infection on the growth and survival of the isopods. Groups of isopods (Asellus aquaticus) belonging to 4 size classes (juveniles, maturing adults, young adults, and older adults) were exposed to infective acanthors of Acanthocephalus
Tiina, Hasu +2 more
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