منابع مشابه
Digestion in Sea Anemones
A sea anemone, normally a passive-looking animal, reacts to suitable food,.. stuffs by a series of fairly complicated activities. When its tentacles encounter solid food there is, first of all, a discharge of cnidae, which poison living prey and adhere to the food mass. These cnidae are independent effectors, responding directly to external excitation (Pantin, 1942). Next, the tentacles clasp t...
متن کاملLatitudinal diversity of sea anemones (Cnidaria: Actiniaria).
We sought to determine if the global distribution of sea anemones (cnidarian order Actiniaria) conforms to the classic pattern of biogeography--taxon richness at the equator with attenuation toward the poles--a pattern that is derived almost entirely from data on terrestrial plants and animals. We plotted the empirical distribution of species occurrences in 10° bands of latitude based on publis...
متن کاملFission in sea anemones: integrative studies of life cycle evolution.
Sea anemones (Phylum Cnidaria; Class Anthozoa, Order Actiniaria) exhibit a diversity of developmental patterns that include cloning by fission. Because natural histories of clonal and aclonal sea anemones are quite different, the gain and loss of fission is an important feature of actiniarian lineages. We have used mitochondrial DNA and nuclear intron DNA phylogenies to investigate the evolutio...
متن کاملFacilitation in sea anemones; the action of drugs.
In a series of papers on the nerve net of the Actinozoa, Pantin (19350, b, c, d) showed that the decisive factor in the neuromuscular activity of these animals is an extreme development of facilitation. This is seen most readily in the transmission of excitation from the nerve net to certain muscleo, in particular the marginal sphincter of Calliactis parasitica and the longitudinal mesenteric m...
متن کاملSea Anemones: Quiet Achievers in the Field of Peptide Toxins
Sea anemones have been understudied as a source of peptide and protein toxins, with relatively few examined as a source of new pharmacological tools or therapeutic leads. This is surprising given the success of some anemone peptides that have been tested, such as the potassium channel blocker from Stichodactyla helianthus known as ShK. An analogue of this peptide, ShK-186, which is now known as...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1916
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.2.8.449