Results 151 to 160 of about 31,941 (201)

Factors conditioning the habitat of freshwater snails.

Bulletin of the World Health Organization, 2000
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Population genetics of freshwater snails

Trends in Ecology & Evolution, 1991
Freshwater snails have attracted the attention of biologists for a long time, because they are intermediate hosts of schistosomes, agents of bilharziases. However, population-genetic studies of freshwater snails have been undertaken only during the past decade, covering topics such as the relative roles of genetic drift and gene flow in subdivided ...
P, Jarne, B, Delay
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The effects of the herbicide atrazine on freshwater snails

Ecotoxicology, 2015
Atrazine has been shown to affect freshwater snails from the subcellular to community level. However, most studies have used different snail species, methods, endpoints, and atrazine exposure concentrations, resulting in some conflicting results and limiting our understanding.
Kyle D, Gustafson, Jason B, Belden, Matthew G, Bolek   +2 more
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The maintenance of hybrids by parasitism in a freshwater snail

International Journal for Parasitology, 2014
Hybrids have often been labelled evolutionary dead-ends due to their lower fertility and viability. However, there is growing awareness that hybridisation between different species may play a constructive role in animal evolution as a means to create variability.
Yonathan, Guttel, Frida, Ben-Ami
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Haemoglobin producing cells in freshwater snails

Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1972
One of the cell types occurring in the connective tissue of gastropods and bivalves is thepore cell. Cells of this type have a characteristic morphology in that their plasmamembrane has many invaginations bridged by cytoplasmic tongues. In the well developed granular endoplasmic reticulum and in these invaginations fine granular material, sometimes ...
T, Sminia, H H, Boer, A, Niemantsverdriet   +2 more
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Chromosomes of Gyraulus circumstratius, a Freshwater Snail

Nature, 1960
POLYPLOIDY is relatively scarce in the animal kingdom, and is apparently almost entirely confined to those species in which reproduction is partheno-genetic, hermaphroditic or clonal1. Such animals usually do not have a heterogametous sex-determining mechanism to be disturbed by polyploidy.
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Monoamines and their metabolites in the freshwater snail Biomphalaria glabrata

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2000
Metabolism of the major monoamines and their functions were studied in the freshwater snail Biomphalaria glabrata. In both juvenile and adult snails, the plasma (cell-free hemolymph) appears to act as a reservoir for most of these monoamines and their metabolites including among others, L-dopa and dopamine as major constituents.
V, Santhanagopalan, T P, Yoshino
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Biological methods for the control of freshwater snails

Parasitology Today, 1990
As a result of the advent of new drugs and diagnostic techniques, the emphasis in the control of schistosomiasis has changed from snail control to chemotherapy for infected individuals. However, chemotherapy does not prevent reinfection and there remains a need to reduce snail densities in human water supplies. In the past, treatment with molluscicides
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Freshwater Snails Of Anwai River

2019
The Nigerian Field, 70 (1), 51 ...
Okonta, A A, Ogunbor, A O
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