(n.) A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, -- or by one, as in the oyster. See Mollusca.
(n.) A pericarp in which the seed case opens or splits into two parts or valves.
(a.) Having two shells or valves which open and shut, as the oyster and certain seed vessels.
Example Sentences:
(1) Start your exploring at Bearreraig Bay, where, if you are lucky, you may find belemnites, ammonites and bivalves.
(2) To compare biochemical differences between bivalves with and without endosymbiotic chemoautotrophic bacteria, specimens of Solemya velum, a bivalve species known to contain bacterial endosymbionts, and the symbiont-free soft-shelled clam Mya arenaria, were collected from the same subtidal reducing sediments during October and November 1988.
(3) We have demonstrated that M. edulis, a marine bivalve mollusc, reacts to the vertebrate monokines interleukin-1, -6 and TNF.
(4) Total neutral and acidic glycosphingolipids were prepared from whole tissues of the sea-water bivalve, Meretrix lusoria, and the former preparation was further fractionated into subgroups by silicic acid column chromatography.
(5) The development of microparticulate food particles for marine suspension-feeders is discussed with respect to the difficulties of nutrient delivery in the aquatic environment and to feeding and digestion in crustacea and bivalve molluscs.
(6) Attempts to introduce infectious or foreign material into oysters and other bivalve mollusks usually involve force or trauma because of immediate, prolonged adduction of the tightly closing valves.
(7) This observation, together with the finding that the oyster shell has a strong affinity for virus, suggests that surface properties, rather than size, are the principal factors governing the accumulation of viruses by filter-feeding marine bivalves.
(8) Chromatin organization in the sperm of the bivalve mollusks results from the interaction between a discrete number of protamine-like proteins (PL) and DNA.
(9) There was the doll's house-sized two-pronged fork, and the bivalves themselves, pale and ivory against the silvered shell.
(10) Infectious pancreatic necrosis virus of fish, infectious bursal disease virus of chickens, Tellina virus and oyster virus of bivalve molluscs, and drosophila X virus of Drosophila melanogaster are naked icosahedral viruses with an electron microscopic diameter of 58 to 60 nm.
(11) The control measures consisted of the prohibition of the harvest and sale of all bivalve mollusks as well as a public warning to avoid the consumption of such shellfish.
(12) The ultrastructural morphology of peripheral neurons and associated structures in the bivalve mollusc.
(13) In 6 male baboons, the left kidney was bivalved and repaired using a fibrin adhesive (group A) or conventional suturing (group B).
(14) There are various types of photoproteins: the photoproteins of coelenterates, ctenophores and radiolarians require Ca2+ to trigger their luminescence; the photoproteins of the bivalve Pholas and of the scale worm appear to involve superoxide radicals and O2 in their light-emitting reactions; the photoprotein of euphausiid shrimps emits light only in the presence of a special fluorescent compound; the photoprotein of the millipede Luminodesmus, the only known example of terrestrial origin, requires ATP and Mg2+ to emit light.
(15) Most progress is being made in relation to lethal blood mutant neoplasms in Drosophila, leukaemias of farmed salmonids among the fishes, and among shellfish, the hemic sarcomas of bivalves.
(16) Distribution of MlOse4Cer and MlXOse5Cer in various bivalve and snail glycolipid extracts were screened in thin-layer immunobinding assays by using this purified specific antibody.
(17) In the haemolymph of the Tridacnid bivalve clams anti-galactans occur which do not have only glycosubstance precipitating and cell agglutinating properties, but also show mitogenic activity with respect to the blast transformation of human peripheral lymphocytes.
(18) The pericardial glands of three bivalve molluscs are composed of convoluted epithelium that appears as pouches on the auricles of Mytilus and as tubules in the connective tissue at the anterior-lateral sides of the pericardial cavity of Mercenaria and Anodonta.
(19) Four biotypes and five antigenic types of bacteria, pathogenic for the larvae of five species of bivalve mollusks, were isolated and described in some detail.
(20) Laboratory toxicity tests performed on the bivalve Cerastoderma edule submitted to sublethal concentrations of paper mill effluent revealed significant decreases of adenylate energy charge (AEC), and changes in the total adenylate pool were observed in a 24-hr period even for the lowest concentration of pollutant tested.
Starfish
Definition:
(n.) Any one of numerous species of echinoderms belonging to the class Asterioidea, in which the body is star-shaped and usually has five rays, though the number of rays varies from five to forty or more. The rays are often long, but are sometimes so short as to appear only as angles to the disklike body. Called also sea star, five-finger, and stellerid.
(n.) The dollar fish, or butterfish.
Example Sentences:
(1) The kinetics of the membrane current during the anomalous or inward-going rectification of the K current in the egg cell membrane of the starfish Mediaster aequalis were analyzed by voltage clamp.
(2) Using tubulin immunostaining, we found that 6-DMAP did not affect the cortical microtubules and resting female centrioles of prophase-arrested starfish oocytes, whereas it induced a precocious disappearance of spindle fibers when applied to hormone-stimulated oocytes.
(3) When he sits back at the piano and plays Raspberry Beret and Starfish and Coffee and Girls and Boys, they’re beside themselves, and understandably so: he sounds magnificent.
(4) The cockle Cardium tuberculatum responds with a typical escape movement (jumping by foot contractions) when touched by a starfish.
(5) Since these characteristics of the starfish egg poly(A)+ RNA are similar to those of cyclin mRNAs from sea urchin and surf clam eggs, we synthesized a 50-mer antisense-cyclin oligonucleotide probe coding for a part of the sea urchin cyclin cDNA and used this to screen starfish RNA.
(6) The cellular events that take place during reconstruction of larval forms from dissociated embryonic cells of the starfish are investigated by thick and thin sections.
(7) Primary afferent electrical activity can be recorded from the chemoreceptors on the mantle margin that are responsive to starfish scent and also from other physiologically distinct receptors that are responsive to contact with starfish tube feet.
(8) A cDNA clone encoding starfish cyclin B has been isolated and its sequence determined.
(9) The changes in activity of a cytoplasmic maturation-promoting factor (MPF), capable of inducing resumption of meiosis when injected into starfish oocytes, were examined during mouse oocyte maturation.
(10) 1-Methyladenine (1MeAde) is the naturally occurring maturation-inducing hormone of starfish oocytes.
(11) The marine gastropods Acmaea (Collisella) limatula and Acmaea (Notoacmea) scutum respond to distant predatory starfish (i.e.
(12) "There are a number of threats facing the reef, including climate change, coastal developments, agricultural runoff, ocean acidification and outbreaks of the crown-of-thorns starfish.
(13) Fatty acid hydroperoxides (lipoxygenase products) are metabolized to allene oxides by a type of dehydrase that has been detected in plants, corals, and starfish oocytes.
(14) Ross said researchers have identified four new species of fish, a new type of starfish and several new species of crustaceans living in the deepwater reefs.
(15) An assessment by the Great Barrier Reef Marine Park Authority cited climate change as the leading threat to the coral ecosystem, with pollution, extreme weather events, and a plague of coral-eating starfish also contributing to its malaise.
(16) This has come about because links have been established between two independent areas of research, one based on a genetic approach using the fission yeast Schizosaccharomyces pombe and the second based on a biochemical approach using Xenopus and starfish oocytes.
(17) In the presence of 1 mM hydroxyurea, fertilized eggs of the starfish, Asterina pectinifera, cleaved up to the 256-cell stage and decomposed before blastulation.
(18) Porcine brain tubulin labeled with fluorescein isothiocyanate (FITC) was able to polymerize by itself and co-polymerize with tubulin purified from starfish sperm flagella.
(19) Although caffeine, theophylline, and theobromine supposedly inhibit maturation of oocytes, studies using the starfish oocyte showed that theobromine does not inhibit maturation and the inhibition caused by caffeine and theophylline is reversible.
(20) The acrosome reaction of spermatozoa from the starfish Marthasterias glacialis was induced with the ionophore A23187.