sea pansy

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sea pansy,

fleshy, leaf-shaped colony of marine organisms belonging to the genus Renilla in the same phylum as the jellyfish. The colony consists of a stalk formed by a large organism called a primary polyp (see polyp and medusapolyp and medusa,
names for the two body forms, one nonmotile and one typically free swimming, found in the aquatic invertebrate phylum Cnidaria (the coelenterates). Some animals of this group are always polyps, some are always medusae, and some exhibit both a polyp and a medusa
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) that is thrust into soft bottom material; the upper part of the stalk is composed of several kinds of secondary polyps. Sea pansies are handsome creatures; the reddish to purple upper stalk is studded with white polyps and is brilliantly luminescent. The colonies occur in the warmer regions of the Atlantic and Pacific coasts. Sea pansies are classified in the phylum CnidariaCnidaria
or Coelenterata
, phylum of invertebrate animals comprising the sea anemones, corals, jellyfish, and hydroids. Cnidarians are radially symmetrical (see symmetry, biological).
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, class Anthozoa, order Pennatulacea.
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References in periodicals archive ?
If intercellular coupling sensitive to gap junction blockers is involved in sea pansy luminescence signaling, then one should be able to detect a protein capable of assembling into connexons for this coupling.
The Western blot detection in sea pansy tissues of a protein recognized by a monoclonal antibody to a peptide segment of rat heart Cx43 provides further evidence that a Cx43-like protein similar to that of mammals exists in anthozoans.
We took advantage of the detection of Cx43-like immunoreactivity in the sea pansy to use the Cx43 antibody in the same fashion and look for evidence of disruption of luminescent activity.
The convergent results from the experiments with gap junction uncouplers and with the Cx43 antibody suggest that a Cx43-like protein is involved in mediating luminescence propagation through cell-to-cell coupling in the sea pansy. The acute inhibitory effect of the antibody on electrically stimulated luminescence means that the antibody binds to an antigen widely distributed in the luminescent endoderm or in the nerve net that propagates the excitatory signals responsible for lighting up photocytes along the signal path (Anderson and Case, 1975).
This arrangement would not be unique to the sea pansy - [Beta]-adrenoceptors acting via cyclic AMP have been implicated in the modulation of gap junction recruitment in mammalian cell lines (Radu et al., 1982).
Through-conduction of mesogleal nerve-net pulses seems to imply that no interneuronal facilitation is necessary in the sea pansy (Anderson and Case, 1975).
An electron microscopic survey of polyp tissues in the sea pansy has failed to unveil any structure resembling conventional gap junctions.