| determination of isocitrate lyase and malate synthase activities in a marine bivalve mollusk by a new method of assay. | 1. a new method for the assay of isocitrate lyase (ec 4.1.3.1) was developed, based on the isolation of 14c-glyoxylate semicarbazone by co-crystallization with authentic carrier. the method was easily adapted to measure malate synthase (ec 4.1.3.2). 2. interfering reactions were avoided with this method, and isocitrate dehydrogenase (id) was easily distinguished from isocitrate lyase (il). assay of il in germinating pumpkin seeds gave rates proportional to the amount of extract, with greater sen ... | 1989 | 2605917 |
| effect of dietary lipids on growth, tissue composition and metabolism of the oyster (crassostrea virginica). | hatchery reared oysters (crassostrea virginica) were fed six different diets for 30 weeks. the diets contained cod liver oil (clo), corn oil (co), corn oil and cod liver oil (1:2) (co + clo), hyrogenated coconut oil (hco), ethyl esters of cod liver oil fatty acids (sf) or cod liver oil ethyl esters supplemented with cholesterol (ch). data on growth and tissue composition imply that oysters have an essential fatty acid (efa) requirement for both linolenic or omega 3 and linoleic or omega 6 series ... | 1980 | 7381595 |
| intracellular acid phosphatase and lysozyme levels in subpopulations of oyster, crassostrea virginica, hemocytes. | | 1988 | 3418134 |
| radiosilver (ag-110m) concentrations in chesapeake bay oysters maintained near a nuclear power plant: a statistical analysis. | an ongoing biomonitoring program using oysters (crassostrea virginica) was implemented in 1978 to monitor radionuclide releases from the calvert cliffs nuclear power plant located on chesapeake bay. the program involves quarterly removal and replenishment of oysters located in a tray about 0.2 km from the effluent discharge. radiosilver (ag-110m) concentrations in tray oysters (pci/kg ww) were analyzed using ancova-like models with plant releases of ag-110m in the present and immediately precedi ... | 1988 | 24248727 |
| cytometric investigations on hemocytes of the american oyster, crassostrea virginica. | pericardial hemolymph was obtained from american oysters (crassostrea virginica) and the hemocytes characterized by flow cytometry. the cells were found to have a broad unimodal size distribution with a median diameter of 7 micrometers. total protein measured by flow cytometric fluorescence of dansylated cells also revealed a broad unimodal distribution similar to that obtained for size. the proportion of hemocytes in each stage of the cell cycle was measured using dna-specific dapi fluorescence ... | 1988 | 18620249 |
| accumulation and bioconcentration of polycyclic aromatic hydrocarbons in a nearshore estuarine environment near a pensacola (florida) creosote contamination site. | long-term accumulation of creosote wastes at a wood-preserving facility near pensacola, florida, has produced high levels of organic contamination of groundwaters near pensacola bay. impacts of this contamination on the nearshore environment of the bay were examined by analysis of water, sediment and tissues of two mollusc species. one of the species (thais haemastoma) was native to the study area. individuals of the other test species (crassostrea virginica) were placed in cages at the test sit ... | 1988 | 15092667 |
| acute toxicity of tributyltin chloride to embryos and larvae of two bivalve mollusks, crassostrea virginica and mercenaria mercenaria. | | 1987 | 3440138 |
| role ofcristispira sp. and other bacteria in the chitinase and chitobiase activities of the crystalline style ofcrassostrea virginica (gmelin). | activity was found for chitinase and chitobiase in the crystalline styles of american oysters (crassostrea virginica gmelin) collected from the chesapeake bay (maryland, usa). the oysters were maintained in tanks on natural food from a constant flow of unfiltered estuarine water. chitinase and chitobiase specific activities were compared with total, viable, and chitinoclastic bacterial counts andcristispira counts. regression analyses revealed that one correlation, chitobiase vscristispira, was ... | 1987 | 24202643 |
| unavailability of polynuclear aromatic hydrocarbons from coal particles to the eastern oyster. | the accumulation by oysters of polycyclic aromatic hydrocarbons (pah) from coal dust entering the estuarine environment has been postulated in the vicinity of coal transfer operations. oysters crassostrea virginica were exposed to coal dust plus 15 day leachate at concentrations of 10 mg litre(-1) and 1 mg litre(-1) coal dust for 28 days in a flow-through test system. potential effects of the exposures were measured by comparing the uptake of pah and the growth of the exposed animals versus cont ... | 1987 | 15092764 |
| segregation and linkage studies of allozyme loci in pair crosses of the oyster crassostrea virginica. | the genetic control of 11 electrophoretically detected allozyme polymorphisms in the oyster crassostrea virginica was investigated in 10 pair crosses. for nine allozyme loci, each offspring shared at least one band (electromorph) with each parent. for the remaining two loci (mannosephosphate isomerase and leucine aminopeptidase-2), some offspring failed to share a band with one or both parents. several lines of evidence indicated that these anomalous results were due to transmission of null alle ... | 1986 | 3800871 |
| purification and characterization studies of cadmium-binding proteins from the american oyster, crassostrea virginica. | the previously reported low molecular weight cadmium-binding protein (cdbp) from the american oyster, crassostrea virginica, has been further purified and characterized by improved technical methods. the internal organ distribution of the protein within the oyster and effects of life cycle/season on cdbp production also have been evaluated. cdbp isolated by extended ion-exchange gradients or double ion-exchange chromatography followed by hplc analysis possesses an electrophoretic rf of about 0.7 ... | 1986 | 3709468 |
| the identification of several prostaglandin moieties in crassostrea virginica and mytilus edulis by radioimmunoassay and high performance liquid chromatography. | the presence of prostaglanin-like compounds was examined by radioimmunoassay and isochratic step-elution high performance liquid chromatography in two commercially important molluscs, the american oyster crassostrea virginica, and the edible mussel mytilus edulis. radioimmunoassays for prostaglandins f2 alpha and e2, and 6-keto f1 alpha (the stable hydrolysis product of prostacyclin) demonstrated mean +/- s.d. levels of 3.19 +/- 2.1, 13.08 +/- 5.4, and 1.5 +/- 0.42 nanograms of prostaglandin equ ... | 1985 | 3865234 |
| simultaneous accumulations of naphthalene, a pcb mixture, and benzo(a)pyrene, by the oyster, crassostrea virginica. | | 1985 | 3919788 |
| subcellular distribution of aminotransferases, and pyruvate branch point enzymes in gill tissue from four bivalves. | aspartate aminotransferase (aat), alanine aminotransferase (alat), malic enzyme (me), malate dehydrogenase (mdh), pyruvate kinase (pk), and phosphoenolpyruvate carboxykinase (pepck) activities in cytosolic and mitochondrial fractions of gill tissue from modiolus demissus (ribbed mussel), mytilus edulis (sea mussel), crassostrea virginica (oyster) and mercenaria mercenaria (quahog) were determined using enzyme assay and starch gel electrophoresis combined with subcellular fractionation. aat showe ... | 1985 | 4053567 |
| uptake, elimination, and metabolism of 14c-picric acid and 14c-picramic acid in the american oyster (crassostrea virginica). | | 1984 | 6517616 |
| analysis of molluscan sterols: colorimetric methods. | the wide variety of sterols normally found in extracts of bivalve molluscs leads to high variability in analytical data obtained with colorimetric (chole)sterol methods. total sterol levels in oyster (crassostrea virginica) extracts were determined using the liebermann-burchard reagent, an acid-fecl3 reagent and a cholesterol oxidase procedure. the data from the latter two agreed to within 5.4% and yielded about 30% higher estimates of sterol content than the liebermann-burchard test. gas-liquid ... | 1984 | 27520514 |
| nickel uptake and loss in the bivalves crassostrea virginica and mytilus edulis. | | 1984 | 6465950 |
| polyspermy inhibition in the oyster, crassostrea virginica. | inhibition of polyspermy is a critical response during fertilization which ensures that only one sperm nucleus will fuse with the female pronucleus to restore the diploid state. oyster (crassostrea virginica) eggs prevent polyspermy by a process occurring at the cell surface. however, 5 min after fertilization, there are still functional sperm receptor sites available for penetration by supernumerary sperm. reinsemination experiments indicate that there is no decrease in the number of penetratio ... | 1983 | 6688632 |
| the nature of cadmium binding in commercial eastern oysters (crassostrea virginica). | | 1983 | 6882013 |
| competitive inhibition by dimethylsulfoxide of molluscan and vertebrate acetylcholinesterase. | anticholinesterase-like effects of dimethylsulfoxide (dmso) were demonstrated on a variety of invertebrate muscles. the excitatory effects of acetylcholine (ach) on the isolated preparations of the geukensia demissa heart and anterior byssus retractor muscle (abrm), and of the busycon contrarium radula protractor muscle, were potentiated by dmso (1-5 microliters/ml; 1 microliter/ml = 14 mm). the negative chronotropic effects of ach, but not of 4-ketoamyltrimethylammonium, were potentiated by dms ... | 1983 | 6830611 |
| arsenic uptake and loss in the american oyster, crassostrea virginica. | in addition to a control crassostrea virginica was treated with 3 and 5 μg as kg(p-1) for 16 wks at ambient seawater salinity and temperature to determine the potential of c. virginica as an indicator of arsenic pollution. prior to spawning, as much as 10.3±1.5, 12.7±2.7, and 14.1±3.7 μg as g(p-1) dry weight were accumulated in the total soft parts of oysters after treatment with ambient (control), 3 and 5 μg as kg(-1), respectively. immediately after spawning, an increase in tissue arsenic conc ... | 1982 | 24264118 |
| beta-glucuronidase in the serum and hemolymph cells of mercenaria mercenaria and crassostrea virginica (mollusca: pelecypoda). | | 1976 | 1245743 |
| effects of leached mirex on experimental communities of estuarine animals. | experimental communities of various estuarine animals in outdoor tanks were exposed to a continuous flow of water containing mirex for 10 weeks. the mirex was leached from fire ant bait (0.3% active ingredient) by fresh water which was then mixed with salt water to yield exposure concentrations averaging 0.038 mug/l. the experiment simulated runoff from treated land into estuarine areas. mortality of grass shrimp (palaemonetes vulgaris), pin, shrimp (penaeus duorarum), common mud crabs (panopeus ... | 1976 | 999334 |
| uptake and loss of inorganic mercury in the eastern oyster (crassostrea virginica). | eastern oysters (crassostrea virginica) were found to accumulate significant levels of mercury on exposure to relatively low concentrations of mercuric chloride. accumulation occurred in two distinct phases which may be described as a two compartment system in which accumulation is logarithmic in the first phase and linear in the second. mercury, during the initial phase, showed a minimum outward concentration flux of 0.025 hr-1 indicating reversibility of accumulation prior to the change in pha ... | 1976 | 970986 |
| lysosomal and other enzymes in the hemolymph of crassostrea virginica and mercenaria mercenaria. | | 1975 | 1183196 |
| acute toxicity of oil and bilge cleaners to larval american oysters (crassostrea virginica). | | 1982 | 7126900 |
| cystic fibrosis. i. fractionation of the mucociliary inhibitor from plasma. | a protein fraction present in low concentrations in plasma of cystic fibrosis homozygotes and heterozygotes has been identified by its biologic activity in ciliary preparations of gills from crassostrea virginica, where it causes mucociliary inhibition. in the present study, mucociliary inhibition was shown to be associated with an igg-rich fraction. the cystic fibrosis mucociliary inhibitor was obtained as a low molecular weight protein after dissociation from igg in 5 m guanidinium chloride. g ... | 1982 | 7200225 |
| polychlorinated biphenyls in clams and oysters from new bedford harbor, massachusetts, march 1978. | polychlorinated biphenyl (pcb) concentrations in clams (mercenaria mercenaria) and oysters (crassostrea virginica) from 17 stations of the western and new bedford harbor areas of buzzards bay, massachusetts, clearly show that the new bedford harbor area is severely polluted. up to 5 ppm pcbs (dry weight) were found in shellfish tissue. the most likely sources of the pcbs are chronic releases from two electrical component manufacturers in new bedford. close proximity of the shellfish to the sourc ... | 1981 | 6817293 |
| effect of cadmium body burdens in adult crassostrea virginica on fecundity and viability of larvae. | | 1981 | 7296069 |
| elimination of laboratory-acquired cadmium by the oyster crassostrea virginica in the natural environment. | | 1981 | 7284630 |
| three types of acetylcholine response in bivalve heart muscle cells. | 1. the acetylcholine (ach) responses of cardiac muscle cells from three species of bivalves were studied by intracellular recording and ach ionophoresis. heart muscle contraction was abolished by bathing in artificial sea water in which mn(2+) had been substituted for ca(2+).2. three different types of membrane potential changes were observed in response to ach pulses: a slow hyperpolarization in the clam mercenaria mercenaria, a rapid depolarization which was sometimes followed by a slower hype ... | 1980 | 7381787 |
| prismatic cristae and paracrystalline inclusions in mitochondria of myocardial cells of the oyster crassostrea virginica gmelin. | several types of unusual mitochondrial configurations were found in myocardial cells of the oyster crassostrea virginica gmelin. these mitochondria include, in order of frequency, prismatic cristae, filamentous paracrystals in honeycomb and herringbone configurations, and paracrystals composed of rows of electron dense particles. the long, parallel, evenly spaced prismatic cristae are square or rhomboidal in cross section. in the space between the prismatic cristae are rodlike structures (4--6 n ... | 1980 | 7428026 |
| cryopreservation of spermatozoa of the american oyster, crassostrea virginica gmelin. | | 1979 | 520008 |
| studies on the depuration of cadmium and copper by the american oyster crassostrea virginica. | | 1979 | 497415 |
| isolation and partial characterization of a cadmium-binding protein from the american oyster (crassostrea virginica). | american oysters (crassostrea virginica) were exposed to 0.1 ppm cadmium for 0--15 days in a flowing seawater system and then placed into clean flowing seawater for 24 h prior to sacrifice. whole oysters were homogenized and a cadmium-binding protein isolated and purified by a process of centrifugation, heat-treatment, sephadex g-75 chromatography, deae cellulose chromatography and disc gel electrophoresis. a highly anionic protein which is not present in control oysters was found to be present ... | 1979 | 466730 |
| bioaccumulation of cadmium in marine organisms. | a general review of cadmium concentrations in marine organisms and studies of cadmium bioaccumulation is presented. factors which influence cadmium concentrations, such as regional differences, seasonal fluctuations and salinity, are discussed and species which are likely to accumulate cadmium identified. experimental studies designed to investigate the influence of some of these factors on cadmium bioaccumulation in a filter feeding bivalve mollusk, the american oyster (crassostrea virginica), ... | 1979 | 488051 |
| combined effects of salinity, temperature, and copper on embryos and early larvae of the american oyster, crassostrea virginica. | | 1979 | 539838 |
| elapid alpha-toxins have no effect on the cholinergic responses of bivalve myocardia. | elapid alpha-toxins (alpha-bungarotoxin, alpha-cobratoxin and crude bungarus caeruleus venom) do not affect the myocardial nicotinic ach receptors of the following bivalve molluscs: mercenaria mercenaria, chione cancellata, mya arenaria, mytilus edulis, rangia cuneata and crassostrea virginica. | 1978 | 729727 |
| metal accumulation and depuration by the american oyster, crassostrea virginica. | | 1978 | 719198 |
| the residue up take and histology of american oysters (crassostrea virginica gmelin) exposed to dieldrin. | | 1978 | 24488 |
| toxicity and bioconcentration of bhc and lindane in selected estuarine animals. | flow-through, 96-hr bioassays were conducted to determine the acute toxicity of technical bhc and lindane to several estuarine animals. test animals and their respective 96-hr lindane lc50 values were: mysid (mysidopsis bahia), 6.3 microgram/l; pink shrimp (penaeus duorarum), 0.17 microgram/l; grass shrimp (palaemonetes pugio), 4.4 microgram/l; sheepshead minnow (cyprinodon variegatus), 104 microgram/l; and pinfish (lagodon rhomboides), 30.6 microgram/l. the 96-hr lc50 values for pink shrimp and ... | 1977 | 71023 |
| purification and properties of adductor muscle phosphofructokinase from the oyster, crassostrea virginica. the aerobic/anaerobic transition: role of arginine phosphate in enzyme control. | phosphofructokinase from oyster (crassostrea virginica) adductor muscle occurs in a single electrophorectic form at an activity of 8.1 mumol of product formed per minute per gram wet weight. the enzyme was purified to homogeneity by a novel method involving extraction in dilute ethanol and subsequent precipitation with polyethylene glycol. oyster adductor phosphofructokinase has a molecular weight of 3400000 +/- 20000 as measured by sephadex gel chromatography. mg2+ or mn2+ can satisfy the dival ... | 1976 | 12948 |
| a comparison of the cholinesterases of an oyster (crassostrea virginica) and a clam (macrocallista nimbosa). | cholinesterase activities in the hearts and ganglia of an oyster (crassostrea virginica) and a venerid clam (macrocallista nimbosa) were measured and compared. tissue extracts were partially purified by ammonium sulfate fractionation followed by gel column chromatography. enzymatic activity was assayed spectrophotometrically; substrates were acetyl-, butyryl-, and propionylthiocholine (atc, btc, ptc). kinetic constants characterizing each enzyme were derived. at all substrate concentrations, the ... | 1976 | 10339 |
| accumulation of cadium by the american oyster, crassostrea virginica. | | 1976 | 934270 |
| experimentally induced elevation of aminopeptidase activity in hemolymph cells of the american oyster, crassostrea virginica. | | 1976 | 956671 |
| oyster-msx interactions: alterations in hemolymph enzyme activities in crassostrea virginica during the course of minchinia nelsoni disease development. | | 1976 | 822105 |
| occurrence of hematopoietic neoplasms in virginia oysters (crassostrea virginica). | a neoplastic disease of the hematopoietic system of oysters was found in tray-cultured native and laboratory-bred populations and was associated with mortalities during field monitoring. the disease, characterized by nuclear abnormalities and intensive proliferation of hemocytes, was first observed at the virginia institute of marine science in 1963. cases rarely occurred during 14 years (1959-1973 inclusive) of regular sampling and monitoring of thousands of oysters. however, two groups exhibit ... | 1976 | 1255763 |
| chlordane: effects on several estuarine organisms. | dynamic marine toxicity tests were performed with technical grade chlordan and eastern oysters (crassostrea virginica), pink shrimp (penaeus duorarum), grass shrimp (palaemonetes pugio), sheepshead minnows (cyprinodon variegatus), and pinfish (lagodon rhomboides). the 96-hr lc20s (and 95% confidence limits) based on measured concentrations of chlordane (in mug/liter) are: ping shrimp 0.4 (0.3-0.6); grass shrimp, 4.8 (4.0-6.0); sheepshead minnows, 24.5 (19.9-28.6); and pinfish, 6.4 (5.0-7.3). the ... | 1976 | 1246088 |
| effects of salinity on three enzymes involved in amino acid metabolism from the american oyster, crassostrea virginica. | | 1976 | 1253571 |
| epizootic and enzootic aspects of minchinia nelsoni (haplosporida) disease in maryland oysters. | minichinia nelsoni disease in oysters (crassostrea virginica) from marumsco bar, pocomoke sound, maryland (an estuarine tributary of chesapeake bay) was studied for 8 years (1961-68) to determine epizootiologic relationships concerning life cycle of the parasite, pathologic effects on the host, and effects of physical factors on population density and recruitment of the host and parasite. the study period covered pre-epizootic, epizootic, and post-epizootic disease conditions. data on the native ... | 1975 | 808602 |
| dna sequence organization in the genomes of five marine invertebrates. | the arrangement of repetitive and non-repetitive sequence was studied in the genomic dna of the oyster (crassostrea virginica), the surf clam (spisula solidissima), the horseshoe crab (limulus polyphemus), a nemertean worm (cerebratulus lacteus) and a jelly-fish (aurelia aurita). except for the jellyfish these animals belong to the protostomial branch of animal evolution, for which little information regarding dna sequence organization has previously been available. the reassociation kinetics of ... | 1975 | 238802 |
| a quantitative study of phagocytosis by hemolymph cells of the pelecypods crassostrea virginica and mercenaria mercenaria. | | 1975 | 1117165 |
| an examination of eggs challenged with cryopreserved spermatozoa of the american oyster, crassostrea virginica. | | 1973 | 4796016 |
| respiratory enzymes in mantle homogenates of crassostrea virginica and the effects of minchinia nelsoni (msx), and cochlodinium helicoides on activity levels. | | 1967 | 4293116 |
| concurrent haplosporidian infections of the oyster, crassostrea virginica (gmelin). | | 1967 | 4960572 |
| fluorescent-antibody studies of haplosporidian parasites of oysters in chesapeake and delaware bays. | a fluorescent antibody was produced against a plasmodial oyster parasite thought to be a haplosporidian, minchinia nelsoni, which was termed msx. the antibody reacted with this type of plasmodia from oysters, crassostrea virginica ( gmelin), from all sources, and it also reacted with its sporulating and spore stages. this reaction indicates cospecificity of the stages. no reaction occurred with any stage of another oyster haplosporidian, minchinia costalis, indi- cating that the m. nelsoni and t ... | 1966 | 4958378 |
| ultrastructure of oocytes from the american oyster crassostrea virginica gmelin. | | 1973 | 4581468 |
| the inorganic composition of molluscan extrapallial fluid. | the inorganic composition of the extrapallial fluids of mercenaria mercenaria, mytilus edulis and crassostrea virginica was significantly different from sea water. calcium was the principal ion bound in the extrapallial fluids. this binding was accomplished by a non-dialyzable component that appeared to be a glycoprotein. | 1972 | 28368702 |
| oyster herpes-type virus. | a herpes-type virus infection, the first to be found in an invertebrate animal, is reported in the oyster crassostrea virginica. intranuclear herpes-type viral inclusions were more prevalent in the oyster at elevated water temperatures of 28 degrees to 30 degrees c than at normal ambient temperatures of 18 degrees to 20 degrees c. the inclusions were associated with a lethal disease at the elevated temperatures. | 1972 | 5082840 |
| | 1. on the coast of florida subtropical lamellibranchs exposed in the tidal region demonstrate a cellular heat resistance which is about 6-7° c higher than in boreal species on the german coast of the north sea. 2. geographically separated populations of the same species, (crassostrea virginica from cape cod and florida, mytilus edulis and macoma balthica from both sides of the atlantic), show only small differences of their cellular heat resistance. thus, no genetically fixed distinctions may be ... | 1972 | 28307202 |
| ultrastructure of spermatozoa from the american oyster crassostrea virginica. | | 1971 | 5119137 |
| influence of environmental factors on respiration of excised tissues of american oysters, crassostrea virginica (gmelin). | | 1971 | 5575659 |
| an electron-microscope study of the constituents of encapsulating cysts in the american oyster, crassostrea virginica, formed in response to tylocephalum metacestodes. | | 1969 | 5385138 |
| anomalies and malformation in the shells of crassostrea virginica. | | 1969 | 5374697 |
| an unusual lesion in the mantle of the american oyster, crassostrea virginica. | | 1969 | 5374695 |
| reduction of furmarate and oxidation of succinate in crassostrea virginica (gmelin). | | 1969 | 4239857 |
| occurrence and chemical structure of nonmethylene-interrupted dienoic fatty acids in american oyster crassostrea virginica. | the american oyster, crassostrea virginica, was found to contain structurally homologous nonmethylene-interrupted dienoic (nmid) fatty acids. the major c20 and c22 nonmethylene-interrupted dienoic fatty acid isomers were shown to occur as two pairs of homologues 5,13-20:2 with 7,15-22:2 and 5,11-20:2 with 7,13-22:2. a combination of analytical procedures was required for conclusive structure determination. | 1975 | 1123972 |
| kinetic properties of lysozyme from the hemolymph of crassostrea virginica. | | 1974 | 4852615 |
| the accumulation of organic and inorganic mercury compounds by the eastern oyster (crassostrea virginica). | | 1974 | 4433812 |
| the effects of minchinia nelsoni infection on enzyme levels in crassostrea virginica. ii. serum phosphohexose isomerase. | | 1969 | 4978661 |
| nutritional studies of a flagellated protozoan hexamita inflata from the canadian oyster, crassostrea virginica. | | 1968 | 5691203 |
| minchinia nelsoni (haplosporida) disease syndrome in the american oyster crassostrea virginica. | | 1968 | 4973751 |
| bacteriophage clearance in the oyster (crassotrea virginica). | since relatively few quantitative immunological studies had been conducted with invertebrates, this study was designed to learn more about the immune potential of the oyster, a molluscan representative. experiments measured the primary and secondary clearance rates of t2 coliphage in the oyster. the fate of phage injected intracardially or intramuscularly was traced by measuring serum and tissue fluid plaque-forming unit levels at various times postinjection. phage-neutralizing activity was also ... | 1968 | 5646620 |
| experimental hexamitiasis in the oyster crassostrea virginica. | | 1968 | 5649249 |
| the origin, structure, and histochemical characterization of encapsulating cysts in the oyster crassostrea virginica parasitized by the cestode tylocephalum sp. | | 1968 | 5649243 |
| the axenic cultivation of hexamita inflata from crassostrea virginica. | | 1968 | 5644412 |
| elastic-mathematical theory of cells and mitochondria in swelling process. ii. effect of temperature upon modulus of elasticity of membranous material of egg cells of sea urchin, strongylocentrotus purpuratus, and of oyster, crassostrea virginica. | the elastic behavior of the cell wall as a function of the temperature has been studied with particular attention being given to the swelling of egg cells of strongylocentrotus purpuratus and crassostrea virginica in different sea water concentrations at different temperatures. it was found that the modulus of elasticity is a nonlinear function of temperature. at about 12-13 degrees c the modulus of elasticity (e) is constant, independent of the stress (sigma) and strain (epsilon(nu)) which exis ... | 1968 | 5689191 |
| chromosome complement of the american oyster crassostrea virginica, as seen in meiotic and cleaving eggs. | | 1967 | 5588794 |
| quantitative studies on trehalose in the oyster, crassostrea virginica gmelin. | | 1967 | 6080516 |
| a proposed life cycle of minchinia nelsoni (haplosporida, haplosporidiidae) in the american oyster crassostrea virginica. | | 1967 | 4973774 |
| sporulation of minchinia nelsoni (haplosporida, haplosporidiidae) in crassostrea virginica (gmelin). | minchinia nelsoni, which haskin, stauber, and mackin found in connective tissue and-digestive diverticula of the american oyster, is characterized by a distinct peripheral endosome in its plasmodial and spore nuclei and by spores of unique dimension (7.5 by 5.4 micro) this species is believed to be the etiologic agent, formerly reported as "msx," responsible for extensive oyster mortalities along the middle atlantic coast. | 1966 | 4958377 |
| the coracidium of the cestode tylocephalum and the migration and fate of this parasite on the american oyster, crassostrea virginica. | | 1966 | 5936510 |
| relationships between bucephalus sp. and crassostrea virginica: a histochemical study of some carbohydrates and carbohydrate complexes occurring in the host and parasite. | | 1966 | 4161765 |
| strontium and magnesium in water and in crassostrea calcite. | distribution of magnesium and strontium was determined between waters and calcites secreted by the oyster species crassostrea virginica and c. rhizophorae in natural habitats at eight localities, from maine to puerto rico. the concentration of strontium in the calcite shells increases with increasing temperature in the range 13 degrees to 25 degrees c, and also with increasing sr(++)/ca(++) molal ratio in the water. the concentration of magnesium in the shells increases irregularly with temperat ... | 1965 | 17835249 |
| ancient oyster shells on the atlantic continental shelf. | shells of long-dead crassostrea virginica are reported at 71 stations in depths of 14 to 82 meters. the depths exceed those of the estuaries where the species flourishes. radiocarbon measurements indicate that the oysters were alive 8000 to 11,000 years ago. it is concluded that the oysters lived in lagoons or estuaries which became submerged when the sea level rose at the end of the latest glacial epoch. | 1965 | 17832789 |
| oysters: composition of the larval shell. | the shell of the freeswimming veliger larval stage of the common north american oyster crassostrea virginica (gmelin, 1791) is composed of aragonite. this composition contrasts with that of the adult shell, which is composed mainly of calcite, the rhombohedral allomorph of calcium carbonate, and minor amounts of aragonite. | 1964 | 17821418 |
| aragonite in the resilium of oysters. | aragonite (orthorhombic caco(3)) composes some of the fibers of the resilium of crassostrea virginica (gmelin). | 1962 | 17736856 |
| the relationship between the flagellate protozoon hexamita and the oyster crassostrea virginica. | | 1962 | 14498204 |
| studies on shell formation. ix. an electron microscope study of crystal layer formation in the oyster. | details of crystal growth in the calcitostracum of crassostrea virginica have been studied with the purpose of analyzing the formation of the overlapping rows of oriented tabular crystals characteristic of this part of the shell. crystal elongation, orientation, and dendritic growth suggest the presence of strong concentration gradients in a thin layer of solution in which crystallization occurs. formation of the overlapping rows can be explained by three processes observed in the shell: a two-d ... | 1961 | 13783329 |
| ultrastructure of the spermatozoon of the oyster. crassostrea virginica. | | 1960 | 13826203 |
| cytology of glycogen and lipid storage in the pallium of crassostrea virginica (gmelin). | | 1959 | 13811410 |
| new property of the crystalline style of crassostrea virginica. | | 1958 | 17741847 |
| studies on shell formation. viii. electron microscopy of crystal growth of the nacreous layer of the oyster crassostrea virginica. | electron microscope observations have been made by means of the replica method on growth processes of calcite crystals of the nacreous layer of the shell of the oyster, crassostrea virginica. layer formation is initiated by the secretion of a conchiolin matrix and the deposition of rounded crystal seeds on or in this material. in some areas crystal seeds are elongate and within a given area show a similar orientation, probably due to slower deposition. the seeds appear to increase in size by den ... | 1958 | 13549499 |
| studies on shell formation. vii. the submicroscopic structure of the shell of the oyster crassostrea virginica. | the submicroscopic structure of the growing surface of the shell of the oyster, crassostrea virginica, was studied by means of shadowed replicas. the outer edge of the prismatic region consists of a fine grained matrix enclosing crystals, the surfaces of which show a finely pebbled structure. crystal size varies continously from 0.01 micro to 8 micro. the matrix surface shows no evidence of fibrous structure. the outer portions of the prismatic region exhibit a tile-like arrangement of large cry ... | 1958 | 13549498 |
| preliminary note on the occurrence of a new protistan parasite, dermocystidium marinum n. sp. in crassostrea virginica (gmelin). | | 1950 | 17791737 |