(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.
Skimmer
Definition:
(n.) One who, or that which, skims; esp., a utensil with which liquids are skimmed.
(n.) Any species of longwinged marine birds of the genus Rhynchops, allied to the terns, but having the lower mandible compressed and much longer than the upper one. These birds fly rapidly along the surface of the water, with the lower mandible immersed, thus skimming out small fishes. The American species (R. nigra) is common on the southern coasts of the United States. Called also scissorbill, and shearbill.
(n.) Any one of several large bivalve shells, sometimes used for skimming milk, as the sea clams, and large scallops.
Example Sentences:
(1) 39 min Superb football from Spain: Fabregas drifts inside before floating a rescue-club chip towards Torres, who flicks it over his head before testing Afinkeev with a skimmer.
(2) The government sent skimmers and booms to help clear up the oil , while BP recruited an "armada" of fishermen , otherwise banned from fishing for shrimp off the waters off Louisiana, to help lay some of the 2.25 million feet of containment booms to contain the slick.
(3) The sections of boom he had seen out in the sea were laid piecemeal and at random, and there seemed to be far too few skimmers drawing up the oil.
(4) Collisional activation was carried out in the high-pressure region between the capillary exit and the skimmer entrance to the mass analyzer.
(5) There have been more than 6,390 vessels (including skimmers, tugs, barges and recovery ships) and over 11m feet of boom deployed offshore to reduce the amount of oil reaching the shoreline.
(6) Clutch size (3.1 to 3.4) of Lavaca Bay black skimmers (Rynchops niger) was no different than that (3.4) at a reference colony near Laguna Vista.
(7) Desolvation is effected by the use of controlled heat transfer through the long capillary tube and collisional activation in a region of reduced pressure between the capillary tube exit and the skimmer.
(8) Heavy metal and selenium concentrations were analyzed in breast feathers of adult black skimmers Rynchops niger, a species with marked sexual size dimorphism in which males average 35% heavier than females.
(9) Some 266,000 barrels of oil had been collected by skimmers out of a total of more than 6m barrels that had dispersed since the rig exploded on 20 April.
(10) His next save was genuinely required as he dived low to deny Necid’s low skimmer.
(11) The positive-ion spectrum was dominated by an ion corresponding to a sodiated molecule when a low potential difference between the capillary exit (nozzle) and the skimmer was employed, but when the capillary exit voltage was increased, fragmentation of PAF was observed.
(12) Eggshell thinning in Forster's terns (7%) and black skimmers (5%) was below that associated with lowered reproduction.
(13) The cost of dealing with the disaster includes the flotilla of 275 skimmers, tugs, barges and recovery vessels being used to collect and disperse the slick, as well as the efforts to stem the spill on the sea bed.
(14) "There were no visible research vessels, and the only visible relief effort in this area was about 30 shrimp boats off the shore of Little Gozier island pulling booms, with no skimmers taking the oil off the surface."