Results 131 to 140 of about 799 (175)
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On the occurrence of vanadium in holothurians
Comparative Biochemistry and Physiology, 1962Abstract Vanadium analyses on nine species of holothurians, representing five genera, and including three species of Stichopus , failed to confirm the report of Phillips (1918) of a high concentration of vanadium in holothurians. Vanadium was found only in traces, 12 p.p.m. of dry weight, in the viscera and body fluids of Stichopus japonicus .
L S, CIERESZKO +3 more
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Muscle regeneration in holothurians
Microscopy Research and Technique, 2001AbstractThe muscle system of holothurians includes visceral (coelomic epithelium) and somatic (longitudinal muscle bands, retractors of aquapharyngeal complex) musculature. Visceral musculature regeneration is achieved by the transformation of myoepithelial cells via their dedifferentiation, migration, proliferation, and redifferentiation.
I Y, Dolmatov, T T, Ginanova
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Micropaleontology of holothurian sclerites
Journal of Sedimentary Research, 1955A resume of the work that has been done on holothurian sclerites is presented, and their morphology is described. A new system of classification is proposed. The stratigraphic relationships and paleoecology of holothurian sclerites are also discussed.
Don L. Frizzell, Harriet Exline
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Visceral regeneration in holothurians
Microscopy Research and Technique, 2001AbstractHolothurians, or sea cucumbers, exhibit two processes that have intrigued biologists for decades: autotomy and regeneration. Autotomy includes the loss of body parts by evisceration or fission, and regeneration is the extraordinary process by which the lost organs are replaced.
J E, García-Arrarás, M J, Greenberg
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Exogonadal Oogenesis in a Temperate Holothurian
The Biological Bulletin, 2007Unusual structures were detected on the visceral peritoneum of the ovarian tubules in about 5%-10% of female sea cucumbers (Cucumaria frondosa) collected off Newfoundland, eastern Canada. The condition varied from mild to severe, with localized castration observed in the most heavily affected tubule sections.
Hamel, J.-F. +3 more
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Transdifferentiation in Holothurian Gut Regeneration
The Biological Bulletin, 2005It has recently been shown that the whole spectrum of cell types constituting a multicellular organism can be generated from stem cells. Our study provides an example of an alternative mechanism of tissue repair. Injection of distilled water into the coelomic cavity of the holothurian Eupentacta fraudatrix results in the loss of the whole digestive ...
Vladimir S, Mashanov +2 more
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Contractions of holothurian muscles
Journal of Comparative Physiology ? A, 1980In response to quick stretch, contraction is elicited in longitudinal retractor muscles of five tested species of holothurians, and in the pharyngeal retractor ofCucumaria. The effects of amplitude of stretch and rate of stretch are additive. Rates of contraction and repetitiveness of response, and spontaneous rhythmicity (especially in muscles ...
C. Ladd Prosser, George O. Mackie
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The Biological Bulletin, 1909
1. In Leptosynapta inhœrens autotomy occurs regularly when unfavorable conditions of environment arise. Experiments with Thyone briareus did not show more than 35 per cent. of cases of autotomy, even under the most favorable circumstances for its occurrence.2. The mechanism involved in autotomy is quite different in the two genera.
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1. In Leptosynapta inhœrens autotomy occurs regularly when unfavorable conditions of environment arise. Experiments with Thyone briareus did not show more than 35 per cent. of cases of autotomy, even under the most favorable circumstances for its occurrence.2. The mechanism involved in autotomy is quite different in the two genera.
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Chemical Analysis of Holothurian Sclerites
Nature, 1958THE Holothuroidea differ from all other echinoderm classes in having a greatly reduced skeletal system. Typically, external plates are absent, while a peripharyngeal crown, anal plates, madreporite and spicules are usually present. Of these, the endoskeletal spicules (or ossicles), formed in superficial dermal layers, constitute the outstanding ...
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