Results 181 to 190 of about 6,972 (211)

Differentiation in the eye of a pulmonate snail Helix aspersa

Journal of Ultrastructure Research, 1967
The development of the eye of a stylommatophoran snail, Helix aspersa , was studied by electron microscopy at various stages of morphogenesis from the initial invagination of the embryonic ectoderm to form an eyecup to the fully differentiated organ in the adult.
Richard M. Eakin, Jean L. Brandenburger
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Ionic regulation in the snail, Helix aspersa

Comparative Biochemistry and Physiology, 1968
Abstract 1. 1. Sodium in the blood of Helix aspera varied between 58 and 138 mM/l. and other cations comparably. 2. 2. In specimens that had fasted 1–11 days and had then been in contact with water for 2 hr, sodium, potassium, calcium and magnesium averaged 68 ± S.D. 6, 2·9 ± S.D. 0·3, 6·2 ± S.D. 1·1 and 3·6 ± S.D.
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The effects of drugs on the neurones of the snail Helix aspersa

Comparative Biochemistry and Physiology, 1961
Abstract 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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Dissection of a Snail (Helix pomatia)

2016
Availability: Roman snails (Helix pomatia) like places which are dark and damp. In spring and autumn, they are most active and easy to collect. When it’s dry or cold, they seal themselves up; they hibernate in winter and aestivate in summer. During these periods giant Ghana snail (Achatina sp.) can be purchased from zoos instead.
György Kriska, György Kriska, Kinga Molnár, Péter Lőw   +3 more
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The pharmacology of helix dopamine receptor of specific neurones in the snail, helix aspersa

Comparative Biochemistry and Physiology, 1968
Abstract 1. 1. Dopamine was found to hyperpolarize and inhibit the spontaneous activity of certain Helix neurones. 2. 2. The inhibitory effect of dopamine was antagonized by ergometrine, ergotamine, ergotoxine, dibenyline, rogitine and yohimbine. 3. 3.
G.A. Kerkut, B. Glaizner, R.J. Walker, C.B. Sedden, G.N. Woodruff   +4 more
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A Specific Agglutinin in the Snail Otala (Helix) lactea [PDF]

Nature, 1965
BLOOD group specific agglutinins (lectins) were found some years ago in various plants1–3. Such substances have been found also in invertebrate animals4, the most recent report being that by Johnson5 of a weak anti-A1 in the clam Saxidomus giganteus.
William C. Boyd, Rebecca Brown
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Gut endocrine cells in the snail Helix aspersa

General and Comparative Endocrinology, 1988
A 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.
Asunción Abaurrea, P. Sesma, Yolanda Alba, J. J. Vázquez, A. C. Villaro   +4 more
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Nerve-muscle junction in the snail Helix aspersa

Comparative Biochemistry and Physiology, 1966
Abstract The nerve-muscle junction in Helix muscle is a simple band-like structure lying on the surface of the muscle fibre.
M. Woodhouse, G.A. Kerkut, G.R. Newman
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Neuroendocrine complexes in the gut of the snail Helix aspersa

Journal of Morphology, 1989
AbstractTo our knowledge, this paper presents the first description of neuroendocrine complexes in invertebrates. Neuroendocrine complexes have been identified in the lamina propria of the snail gut by light microscopy using Giemsa‐stained, deplasticized sections and by electron microscopy.
A. C. Villaro, Y. Alba, P. Sesma, J. J. Vázquez   +3 more
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Snail mucus − glandular origin and composition in Helix pomatia

Zoology, 2017
Apart from their well-known culinary use, gastropod species such as Helix, which have a hydrogel-like mucus, are increasingly being exploited for cosmetic, bioengineering and medical applications. However, not only are the origin and composition of these "sticky" secretions far from being fully characterized, the number and morphology of the mucus ...
Norbert Cyran, Janek von Byern, Andreas Gugumuck, Livia Rudoll, Waltraud Klepal, Sophie Greistorfer, Johannes Suppan   +6 more
openaire   +4 more sources