Results 211 to 220 of about 3,171 (248)

The secretion and development of nematocysts in a siphonophore

Journal of Cell Science, 1973
ABSTRACT Nematocyst development was watched in living cells of a siphonophore, Rosacea cymbiformis. The secretion differentiates in the formative cell into an ovoid capsule, continuous with a long apical tube. The entry of this ‘external’ tube into the capsule creates the coiled internal’ thread’ of the mature nematocyst.
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The behavioral and developmental physiology of nematocysts

Canadian Journal of Zoology, 2002
Nematocysts are the nonliving secretions of specialized cells, the nematocytes, which develop from multipotent stem cells. Nematocysts are the means by which coelenterates capture prey and defend against predation. The 25 or more known types of nematocysts can be divided into to four functional categories: those that pierce, ensnare, or adhere to prey,
A A Scappaticci, G. Kass-Simon
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Phospholipase in the nematocyst toxin of Physalia physalis

Toxicon, 1971
Abstract The presence of phospholipase A (phosphatide acyl-hydrolase, EC 3.1.1.4) and phospholipase B (lysolecithin acyl-hydrolase, EC 3.1.1.5) is demonstrated in the crude nematocyst toxin of Physalia physalis, the Portuguese man-of-war. Their significance is discussed.
L.W. Stillway, Charles E. Lane
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Cytochemical Research on Coelenterate Nematocysts

Nature, 1955
A NOTE by T. M. Yanagita and T. Wada1 suggesting, after C. H. Brown2, the possible keratin nature of coelenterate nematocysts has directed my attention to the subject. In 1952 I had observed the pronounced metachromatic colour produced by dilute thionin on large nematocysts from a siphonophore, Halistemma sp.
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Beachside preparation of jellyfish nematocyst tentacles

Toxicon, 1992
A comparison of methods for preparing a jellyfish nematocyst suspension from sea nettle (Chrysaora quinquecirrha) fishing tentacles at the beachside was conducted. Autolysis of the tentacle followed by straining and sedimentation on ice was found to be a satisfactory technique.
Helene M. Rubinstein, Joseph W. Burnett, Karen O. Long   +2 more
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Active Nematocyst Isolation Via Nudibranchs

Marine Biotechnology, 2009
Cnidarian venoms are potentially valuable tools for biomedical research and drug development. They are contained within nematocysts, the stinging organelles of cnidarians. Several methods exist for the isolation of nematocysts from cnidarian tissues; most are tedious and target nematocysts from specific tissues.
Yossi Loya, Esti Kramarsky-Winter, Ami Schlesinger, Ami Schlesinger   +3 more
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The anchoring of nematocysts and nematocytes in the tentacles of hydra

Journal of Ultrastructure Research, 1982
The ultrastructure of nematocyte junctions in hydra tentacles was examined by electron microscopy using thin sections and freeze-fracture replicas. The apical region of a nematocyte is joined to the battery cell by septate junctions. A second basal junctional relationship simultaneously anchors a nematocyte to a surrounding battery cell and the ...
Richard L. Wood, Patricia L. Novak
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Nematocysts of the Coronate Scyphomedusa, Linuche unguiculata, with a Brief Reexamination of Scyphozoan Nematocyst Classification

Chesapeake Science, 1974
Nematocysts were examined in specimens of the coronate scyphomedusaLinuche unguiculata collected off the North Carolina coast. The cnidome consisted of isorhizas and heterotrichous microbasic euryteles. The isorhizas were all of the a-isorhiza variety; euryteles were present in small and large size classes.
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Cobalt Staining OfActinia EquinaNematocysts

Stain Technology, 1978
Nematocysts of Actinia equina are stained black by incubation in 2% CoCl2 followed by an aqueous wash and H2S treatment. They are also stained positively by morin. Nematocysts isolated from the acrorhage were found to have a high concentration of calcium of which only 30% was "free." It is suggested that the high concentration of calcium in the ...
Martin J. Connock, Yvonne J. Reid, Margaret A. Edwards   +2 more
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Physalia Nematocysts: Utilized by Mollusks for Defense

Science, 1969
Nudibranchs Glaucus and Glaucilla store and utilize for their own defense the nematocysts of the venomous siphonophore Physalia .
I. Bennett, T. E. Thompson
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