Biology, University Victoria, Victoria, British Columbia, Canada V8W 2 - PDF document

Biology, University Victoria, Victoria, British Columbia, Canada V8W 2Y2 œ Friday Laboratories, University Washington, Friday Harbor, Washington by means adhering to recoiling each 2 s m M out and 4-5 mm) not touched can be directly over the tentillar stalk coiled length contraction of the tentacle 1 mm Fig. 2A, living tentillum A rest and B after discharge, adhering a copepod in cases as it the tentillum 0.3 M KC1 be recoiled. diameter, show The main on immature as these to an coiled tentillum longitudinally oriented On one side lie are figured another group lie weil the boxes All the be classified as the tentillum cells lie are the noted by cells fill between the / / / the inside, gland cell; on the the right solid black with boxes, Cross section as in longitudinally oriented transverse lamella other orientations to the surface (Fig. 4C). banding pattern 4B, 5A). are also t t and calf 1985) for the collagen. cells. A whole squashed shows a cell. B surface, showing boxes. C boxes, as D Cross section a boxless in location epidermal cell are readily shaft there electron microscope box usually appears no ultrastructural 7 B). the places living muscle surface showing separated from 8A), some of many portion of to the to the normally contract other cytoplasmic and measurements involves active the evidence here show the fixed while 1.1 ~tm, Thus, the to the B, C Relaxed muscle fibres, contraction but the relaxed living tissue (0.1 p.m) to cause the tentillum readily observed. units are 2 : 1, a that con- and do They contain the thick have been are the deepest inner-ring cells. muscle fibres also showing and myofilaments typical cross section two transitional between filaments are box rows where the the extracellular what appear the tentillum they aggregate along on cell (mJ) 3 (Fig. cell, with pm or and other and summarized 9 + 2 for other 60-nm periodicity tapering to and packed also present, sensory function. epithelium, as by Hernandez-Nicaise up to and contradictions supporting cells. and other they have very irregular Scattered secretory A Cross-section of outer cleft. C cell. D Basal a sensory E A peg sensory cells (ps), their is a z S ) ' cross sections the stalk term better for the or by other or paralyse processes, which act Mucus cells ( Figs. 11E, previous accounts as frag- of mature components of sides in at the (Fig. 13A). cells lie in continue up up to are no where the as in tentacle are those lower show very condensed nucleoplasm, 13A-C. Stalk mature tentillum. A cross-section showing mesogloea (me), with randomly oriented collagen bundles, a mucus and smooth muscle fibres shows one the circle inner-ring cells. B Details inner-ring cell microtubule type and collagen bundles. C Neuromuscular junction keel smooth muscle types are run out there are is still cells still begun to 15A), whereas later, in tentillum are fits weil beneath an cell is filled cell is adhesive granules al. (1972) transformation products seemingly implicated in with processes in mesogloea. B stage, with nucleated cells (still processes) clustering collagen lameUa as in some with collagen bundles are the convincingly by top and shown by no trace thin fold ported by the vexed but according chromatin. The only histochemical showing accessory colloblast, the Hovasse and (Fig. 17A). nucleolar organizer the nucleus the thin the nucleus all stages, and protein refractive granules the layer muscle fibres nuclei become nuclei lose nucleoplasm from (sJ), C on the the rows compression and repidly. This a coiled (relaxed) tentillum. The rows would resist compression and prevent the tentillum from collapsing the striated muscles contract, making it possible the tentillum straighten out discharge). The transverse collagen lamella and criss-cross collagen would restore the tentillum coiled shape The smooth muscles the inner curve of help retain haul the prey in after capture days to destroy contractions. Anaesthe- energy stored the boxes some extent getting longer. fixed in the new to be 4 C). al. 1976) so hefe. Cross sections through the A relaxed and B actively extended tentillar shaft only one magnesium concen- the units responsible need ctenophores) and any ctenophore, a skele- so as are the other tentacular or drag shot out The pigment terms the observing prey suspect the prey con- the peg to shorten gap junctions glycogen and the picture cost for occasional the tentillum are the muscles transverse collagen collagen strands. addition, they are clearly tentacle at transport pro- cell, cells more work stages in pycnotic and at the de Ceccatty, by the by the the project this study. funding for and funding for A (1972) Pleurobrachia pileus. Z primitive animals: axoplasm on 315 : II. Les 143 : The nervous 2 : (1974 a) 6 : G (1982) relaxed and and neuromuscular neuromuscular 162: 333-350 Hovasse R, de Puytorac P (1962) Contributions ä la connaissance du colloblaste, gräce ä la microscopie electronique. CR Acad Sci (Paris) [D] 255 : 3223-3225 Hoyle G (1983) The invertebrates: Published by the Südsee: VI. 41 : by submersible 7 : siphonophore behavior diets: evidence In: Shelton R (1935) interprétation cytologique cytologique 200:1628-1630 Received July 7, 1987