Results 131 to 140 of about 1,409 (165)
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Tissue buffering in the snail, Helix aspersa
Comparative Biochemistry and Physiology, 19701. 1. Changes in the concentrations of calcium and bicarbonate in the blood of hydrated Helix aspera, exposed to raised tensions of carbon dioxide or injected with HCl, NaHCO3 or CaCl2, were qualitatively those to be expected if the blood were in equilibrium with solid calcium carbonate. 2. 2.
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CO2 chemoreception in the pulmonate snail, Helix aspersa
Respiration Physiology, 1993We have studied the response of the pneumostome to CO2, O2 and combined CO2 and O2 in intact snails. We found that pneumostomal opening increases in response to both hypercapnia and mild hypoxia. We determined which neural structures were essential for the pneumostomal response to CO2 by eliminating parts of the nervous system: the subesophageal ...
J S, Erlichman, J C, Leiter
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Surfactant in the Gas Mantle of the SnailHelix aspersa
Physiological and Biochemical Zoology, 1999Surfactant occurs in cyclically inflating and deflating, gas-holding structures of vertebrates to reduce the surface tension of the inner fluid lining, thereby preventing collapse and decreasing the work of inflation. Here we determined the presence of surfactant in material lavaged from the airspace in the gas mantle of the pulmonate snail Helix ...
Daniels, Christopher B. +5 more
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Evolution of the synaptonemal complex in Helix aspersa spermatocytes
Chromosoma, 1972Peer ...
Esponda, Pedro, Stockert, Juan Carlos
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The effects of drugs on the neurones of the snail Helix aspersa
Comparative Biochemistry and Physiology, 1961Abstract 1. (1) The effect of adding various chemicals to the isolated brain of the snail Helix aspersa is described. The reactions were followed by measuring the effect of the chemicals on the resting potential and the spontaneous action potentials of the nerve cells. 2.
G A, KERKUT, R J, WALKER
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Aminopeptidase activities present in tissues of Helix aspersa
Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 19911. Tissues of Helix aspersa have been examined for the presence of aminopeptidase activities. 2. Enzyme activities were detected using synthetic peptide substrates containing the fluorescent leaving group 7-amino-4-methyl coumarin. The methods used included continuous fluorimetric assay and activity staining of enzymes in non-denaturing polyacrylamide ...
Ennis, M.P. +2 more
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Gut endocrine cells in the snail Helix aspersa
General and Comparative Endocrinology, 1988A microscopic study of the endocrine cells present in the gut of the snail Helix aspersa is made. Electron microscopy is necessary in most cases to identify the enteroendocrine cells, since neither silver impregnations nor immunocytochemical staining have rendered positive results. Endocrine cells are scarce and rest on the basement membrane.
Y, Alba +4 more
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Nerve-muscle junction in the snail Helix aspersa
Comparative Biochemistry and Physiology, 1966Abstract The nerve-muscle junction in Helix muscle is a simple band-like structure lying on the surface of the muscle fibre.
G A, Kerkut, M, Woodhouse, G R, Newman
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L'escargot Helix aspersa. Biologie - élevage
199090 ref. annexes 16 P.
Bonnet, J.C. +2 more
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Why the Ovotestis ofHelix aspersais Innervated
Acta Biologica Hungarica, 2004Although Schmalz described the innervation of the ovotestis in pulmonate snails as early as 1914, no functions have been attributed to it. In H. aspersa, the intestinal nerve branches profusely within the ovotestis and terminates in the walls of the acini and in the sheath surrounding the early portion of the hermaphroditic duct.
Chase, R. +3 more
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