| the effect of phenylglyoxal on cu,zn superoxide dismutase from the shark prionace glauca. | | 1990 | 2391237 |
| substitution of arginine for lysine 134 alters electrostatic parameters of the active site in shark cu,zn superoxide dismutase. | the complete amino acid sequence was determined for the cu,zn superoxide dismutase from the shark prionace glauca. the active site region shows the substitution of an arg for lys at position 134, which is important for electrostatic facilitation of the diffusion of o2- to the catalytically active copper. this change may be related to observed alterations of electrostatic parameters of the enzyme (pk of the ph dependence of the enzyme activity, rate of inactivation by h2o2), although it preserves ... | 1989 | 2500367 |
| the complete amino acid sequence of growth hormone of an elasmobranch, the blue shark (prionace glauca). | the complete amino acid sequence of growth hormone (gh) from a phylogenetically ancient fish, the blue shark (prionace glauca), was determined. the shark gh isolated from pituitary glands by u. j. lewis, r. n. p. singh, b. k. seavey, r. lasker, and g. e. pickford (1972, fish. bull. 70, 933-939) was purified by reversed-phase high-performance liquid chromatography. the hormone was reduced, carboxymethylated, and subsequently cleaved in turn with cyanogen bromide and staphylococcus aureus protease ... | 1989 | 2707584 |
| chemical nature of proteins in the placoid scale of the blue shark, prionace glauca l. | | 1980 | 6778463 |
| hepatic cholangiocarcinoma and testicular mesothelioma in a wild-caught blue shark, prionace glauca (l.). | an adult male blue shark, prionace glauca (l.), caught in july 2000 by a recreational fisherman off long island, new york, usa, had a retained fishing hook from a previous capture. the hook penetrated the gastric wall and lacerated the right liver lobe. macroscopic lesions consisted of transmural gastritis and peritonitis. alteromonas sp. and vibrio alginolyticus were isolated from the peritoneal fluid. in addition, a well delineated, sessile mass was found on the otherwise normal serosa of the ... | 2003 | 12962210 |
| taxonomic reports of otobothrioidea (eucestoda, trypanorhyncha) from elasmobranch fishes of the southern coast off brazil. | specimens of elasmobranch fishes, captured in the states of paraná and santa catarina, of the southern coast off brazil, represented by three families, four genera, and four species, were parasitized with otobothrioid trypanorhynch cestodes: heptranchias perlo (bonnaterre, 1788), squalus sp. and carcharhinus signatus (poey, 1868) were parasitized with progrillotia dollfusi carvajal & rego,1987; prionace glauca (linnaeus, 1758) with molicola horridus (goodsir, 1841) dollfus, 1942. details of inte ... | 2004 | 15057344 |
| the taxonomy of some poecilacanthoidea (eucestoda: trypanorhyncha) from elasmobranchs off the southern coast of brazil. | specimens of elasmobranchs, collected in the state of santa catarina, brazil, were parasitized with poecilacanthoidea trypanorhynch cestodes. sharks of the species prionace glauca harboured callitetrarhynchus gracilis and floriceps saccatus, and those of the species sphyrna zygaena were infected with callitetrarhynchus speciosus. details of the proglottids of f. saccatus, provided by bright-field, and/or scanning electron microscopy, are described. adults of f. saccatus are reported for the firs ... | 2006 | 16923274 |
| [ultrastructures of the dental enameloid in prionace glauca (l.)]. | | 1996 | 170254 |
| computer-assisted evaluation of isoelectric focusing patterns in electrophoretic gels: identification of smoothhounds (mustelus mustelus, mustelus asterias) and comparison with lower value shark species. | in this work, the most commercially important selachian species, smoothhound (mustelus mustelus) and starry smoothhound (mustelus asterias), have been identified by polyacrylamide isoelectric focusing (ief-page), along with several shark species of minor commercial value. in italy, these two smoothhound species are commonly subjected to fraudulent substitution with lesser valued sharks. after the electrophoretic runs, the band patterns of the two mustelus species were compared with those of dogf ... | 2001 | 11386666 |
| [studies on the genotoxic effects of crude liver oils from 3 species of mediterranean sharks by means of in vitro micronucleus test using human lymphocytes]. | lymphoid system tumours have been identified in two subjects who used to handle for several years mediterranean shark liver oil and squalen extracted from this oil. moreover, scientific data, reported in 1959 by kröning, show the induction of lymphoid tumours in c57 b1 mice after exposure of their skin to squalen. these observations rose the question of a possible mutagenic power of shark liver oil. in order to determine the genotoxicity of these oils, in vitro assays have been performed on crud ... | 2000 | 11022102 |
| effect of u-995, a potent shark cartilage-derived angiogenesis inhibitor, on anti-angiogenesis and anti-tumor activities. | a potent angiogenesis inhibitor, u-995, has been purified from the cartilage of the blue shark (prionace glauca). u-995 is composed of two single peptides with molecular mass of 10 and 14 kda, respectively. | 1998 | 9891506 |
| accumulation pattern of butyltin compounds in dolphin, tuna, and shark collected from italian coastal waters. | tributyltin (tbt) and its breakdown products, mono-(mbt) and dibutyltin (dbt) were determined in bottlenose dolphin (tursiops truncatus), bluefin tuna (thunnus thynnus thynnus) and blue shark (prionace glauca) collected from the italian coast of the mediterranean sea in 1992-1993. concentrations of total butyltin (bts) in the liver of dolphin (1,200-2,200 ng/g wet wt) were an order of magnitude higher than in the blubber (48-320 ng/g wet wt). tbt was the predominant butyltin species in the blubb ... | 1996 | 8687986 |
| molecular modeling and electrostatic potential calculations on chemically modified cu,zn superoxide dismutases from bos taurus and shark prionace glauca: role of lys134 in electrostatically steering the substrate to the active site. | the three-dimensional structure of cu,zn superoxide dismutase (sod) from the shark prionace glauca was homology modeled on the structure of the bovine enzyme used as a template. shark sod displays the conservative substitution of one of the residues involved in the electrostatic guidance of superoxide toward the active site of the enzyme, i.e., lys134, which is replaced by arginine. the association rate, calculated by brownian dynamics simulations incorporating electrostatic terms, and the enzym ... | 1994 | 8031131 |
| attachment site specificity and the tapeworm assemblage in the spiral intestine of the blue shark (prionace glauca). | the parasite assemblage in the scroll-type spiral intestine of 24 specimens of the blue shark prionace glauca collected off of montauk, long island, new york was investigated. when opened with a longitudinal incision to the right of the ventral blood vessels, the internal mucosal spiral of the spiral intestine of the blue shark could be unrolled into a flat sheet of double-sided mucosal tissue. attachment sites and parasite assemblages were studied on both sides of the sheet in 12 sharks and on ... | 1995 | 7707188 |
| tissue distribution of 7-dehydrocholesterol, vitamin d3 and 25-hydroxyvitamin d3 in several species of fishes. | a high-performance liquid chromatographic (hplc) method for simultaneous determination of 7-dehydrocholesterol (7-dhc), vitamin d3 and 25-hydroxyvitamin d3 (25-oh-d3) in tissues of fishes was established, and using this method the tissue distribution of the sterols in lamprey (entosphenus japonicus), great blue shark (prionace glauca), skipjack (katsuwonus pelamis) and albacore (thunnus alalunga) was investigated. the results are summarized in the following: although the alimentary canal, gall b ... | 1986 | 3012050 |
| subunit dissociation in fish hemoglobins. | the tetramer-dimer dissociation equilibria (k 4,2) of several fish hemoglobins have been examined by sedimentation velocity measurements with a scanner-computer system for the ultracentrifuge and by flash photolysis measurements using rapid kinetic methods. samples studied in detail included hemoglobins from a marine teleost, brevoortia tyrannus (common name, menhaden); a fresh water teleost, cyprinus carpio, (common name, carp); and an elasmobranch prionace glauca (common name, blue shark). for ... | 1976 | 1002703 |
| identification of factors influencing shark catch and mortality in the marshall islands tuna longline fishery and management implications. | recent average annual catches of sharks by tuna longline vessels fishing in the republic of the marshall islands (rmi) are estimated to be between 1583 and 2274 t. although 22 shark species have been recorded by the observer programme for this fishery, 80% of the annual catch comprises only five species: blue shark prionace glauca, silky shark carcharhinus falciformis, bigeye thresher shark alopias superciliosus, pelagic thresher shark alopias pelagicus and oceanic whitetip shark carcharhinus lo ... | 2012 | 22497410 |
| dna barcoding of shark meats identify species composition and cites-listed species from the markets in taiwan. | an increasing awareness of the vulnerability of sharks to exploitation by shark finning has contributed to a growing concern about an unsustainable shark fishery. taiwan's fleet has the 4th largest shark catch in the world, accounting for almost 6% of the global figures. revealing the diversity of sharks consumed by taiwanese is important in designing conservation plans. however, fins make up less than 5% of the total body weight of a shark, and their bodies are sold as filets in the market, mak ... | 2013 | 24260209 |
| cestodes of the blue shark, prionace glauca (linnaeus 1758), (carcharhiniformes: carcharhinidae), off the west coast of baja california sur, mexico. | the cestode species recovered from the spiral intestines of 27 blue sharks (prionace glauca) (linnaeus, 1758) are reported from the western coast of baja california sur (bcs). the sampling was undertaken on a monthly basis from january 2003 to january 2004. the helminthological examination indicated the presence of four species of cestodes: platybothrium auriculatum yamaguti, 1952; prosobothrium japonicum yamaguti, 1934; anthobothrium caseyi (yamaguti, 1934) ruhnke & caira, 2009; and paraorygmat ... | 2016 | 27394312 |
| two new species of anthobothrium van beneden, 1850 (tetraphyllidea: phyllobothriidae) from carcharhinid sharks, with a redescription of anthobothrium laciniatum linton, 1890. | anthobothrium laciniatum linton, 1890 is redescribed based on specimens taken from the dusky shark carcharhinus obscurus (lesueur) collected from the northwestern atlantic ocean, and a neotype is designated. a. laciniatum differs from a. cornucopia van beneden, 1850, a. altavelae euzet & ben hassine, 2002, a. lesteri williams, burt & caira, 2004 and a. spinosum subhapradha, 1955 in total length. it further differs from a. cornucopia, a. altavelae and a. spinosum in proglottid number, and differs ... | 2009 | 19189232 |
| oral administration of shark type ii collagen suppresses complete freund's adjuvant-induced rheumatoid arthritis in rats. | shark type ii collagen (scii) is extracted as a glycoprotein from the cartilage of blue shark (prionace glauca). we aim to confirm the effects of oral tolerance of scii on inflammatory and immune responses to the ankle joint of rheumatoid-arthritis rats induced by complete freund's adjuvant (cfa). | 2012 | 24281405 |
| in vitro tropic action of acth upon adrenocortical cyclic nucleotide (camp, cgmp) production and corticosterone output in blue (prionace glauca linnaeus) and in mako (isurus oxyrinchus rafinesque) sharks. | | 1984 | 215493 |
| branchial blood flow distribution in the blue shark (prionace glauca) and the leopard shark (triakis semifasciata). | electromagnetic flow (emf) quantification of total cardiac stroke flow is not feasible for most elasmobranchs because the vascular anatomy precludes probe placement adjacent to the heart and proximal to all afferent branchial arteries (aba). most previous studies report a fractional cardiac flow, made with the emf probe placed on the ventral aorta between the innominate arteries and aba 3. estimation of total cardiac stroke flow from such data requires a flow correction factor obtained by sacrif ... | 2008 | 2620709 |
| Bioaccumulation and Biomagnification of Total Mercury in Four Exploited Shark Species in the Baja California Peninsula, Mexico. | The present study determined the average mercury bioaccumulation in the muscle tissue of four shark species (Carcharhinus falciformis, Prionace glauca, Sphyrna zygaena and Isurus oxyrinchus) captured in the Baja California Peninsula. We also evaluated biomagnification of some prey consumed by sharks. All sharks' species had mercury levels over the limit specified by the Mexican government for human consumption. Blue shark (P. glauca) presented highest mercury values (1.96 ± 1.48 µg/g Hg d.w.) an ... | 2011 | 22187022 |
| testicular degeneration during spermatogenesis in the blue shark, prionace glauca: nonconformity with expression as seen in the diametric testes of other carcharhinids. | the elasmobranch testis consists of spherical spermatocysts, each housing a single germ cell stage and its own clone of sertoli cells. because of the simple diametrical arrangement of cysts in maturational order, the testes of squalus acanthias, scyliorhinus canicula, and prionace glauca are classified as the diametric shark testis type. the aim of this study was to document histologically the spermatocyst composition in the blue shark stage-by-stage and to establish whether the diametric testis ... | 2011 | 21538475 |
| biomagnification of mercury and selenium in blue shark prionace glauca from the pacific ocean off mexico. | the aim of this study was to determine the biomagnification of mercury through the principal prey of the blue shark, prionace glauca, off the western coast of baja california sur, mexico, as well as the relationship between mercury and selenium in blue sharks. high levels of mercury were found in shark muscle tissues (1.39?±?1.58 µg/g wet weight); these values are above the allowed 1.0 µg/g for human consumption. the mercury to selenium molar ratio was 1:0.2. we found a low correlation between m ... | 2011 | 21465285 |
| the extent of population genetic subdivision differs among four co-distributed shark species in the indo-australian archipelago. | the territorial fishing zones of australia and indonesia are contiguous to the north of australia in the timor and arafura seas and in the indian ocean to the north of christmas island. the area surrounding the shared boundary consists of a variety of bio-diverse marine habitats including shallow continental shelf waters, oceanic trenches and numerous offshore islands. both countries exploit a variety of fisheries species, including whaler (carcharhinus spp.) and hammerhead sharks (sphyrna spp.) ... | 2009 | 19216767 |
| [total mercury in muscle of the shark prionace glauca (linnaeus, 1758) and swordfish xiphias gladius linnaeus, 1758, from the south-southeast coast of brazil and the implications for public health]. | total mercury (thg) was analyzed in muscle tissue from the blue shark prionace glauca and the swordfish xiphias gladius, obtained from the south and southeast coast of brazil, to verify compliance with current limits for human consumption. samples were obtained through the revizee program and a commercial fishery in itajaí, santa catarina state. a total of 95 specimens were analyzed (48 x. gladius and 47 p. glauca), and correlations were checked between thg and fish length and weight. thg ranged ... | 2008 | 18813682 |
| molecular markers of cancer in cartilaginous fish: immunocytochemical study of pcna, p-53, myc and ras expression in neoplastic and hyperplastic tissues from free ranging blue sharks, prionace glauca (l.). | archival formalin-fixed tissues from wild-caught adult blue sharks, prionace glauca (l.), were used for immunocytochemical detection of proliferating cell nuclear antigen (pcna), two oncoproteins from the oncogenes c-myc and pan-ras, and a protein product from the tumour suppressor gene p-53. all sharks were caught during summer months between 2000 and 2006 by recreational fishermen off the usa coast in the northwestern atlantic. the sharks were necropsied on landing and selected organ samples w ... | 2008 | 18234018 |
| a novel polypeptide from shark cartilage with potent anti-angiogenic activity. | using guanidine-hcl extraction, acetone precipitation, ultra-filtration and chromatography, a novel polypeptide with potent anti-angiogenic activity was purified from cartilage of the shark, prionace glauca. n-terminal amino acid sequence analysis and sds-page revealed that the substance is a novel polypeptide with mw 15500 (pg155). the anti-angiogenic effects of pg155 were evaluated using zebrafish embryos model in vivo. treatment of the embryos with 20 microg/ml pg155 resulted in a significant ... | 2007 | 17426448 |
| polychlorinated biphenyls and ddt in swordfish (xiphias gladius) and blue shark (prionace glauca) from brazilian coast. | the polychlorinated biphenyls (pcbs) and ddt may bioaccumulate in the aquatic food web and have been of great concern due to their toxic effects on wildlife and human health. there is evidence showing that fish in the human diet contributes at a significant proportion to the total intake of pcbs and other organochlorine compounds, particularly fish with higher fat levels. this study investigated the concentration of pcbs and ddts in muscle tissues of samples of the blue shark (prionace glauca) a ... | 2007 | 17223179 |
| genetic diversity in the trypanorhynch cestode tentacularia coryphaenae bosc, 1797: evidence for a cosmopolitan distribution and low host specificity in the teleost intermediate host. | partial large subunit (28s) rrna gene (lsu) sequences were studied from tentacularia coryphaenae (cestoda: trypanorhyncha) plerocercoids from the southern java coast, indonesia, collected from two different localities and five different host species. the teleost hosts belonged to four fish families with an overlapping depth range of 0-885 m. the lsu sequences were identical, demonstrating that all specimens belonged to the same species. they also corresponded to a sequence of t. coryphaenae from ... | 2007 | 17216487 |
| [fishery of oceanic and coastal sharks in colima, jalisco and michoacán]. | shark fishery is one of the most important activities in the mexican pacific coast, nevertheless, there is few data available about the specific captures done by the fleet along the coast. this study describes fishery biology aspects of the shark species catched by the semi-industrial long-line fleet of manzanillo. monthly samplings were made on board of these vessels during an annual period from april 2006 to april 2007. captured species composition (n = 1 962 organisms) was represented by nine ... | 2011 | 21721232 |
| sperm storage in male elasmobranchs: a description and survey. | two basic types of spermatozoan aggregates, spermatophores and spermatozeugmata, found in 14 different species of sharks, one species of skate, and one species of chimaera (holocephalan), were investigated using light and scanning electron microscopy. spermatophores, aggregates (usually 1,000-6,000 microns in diameter and larger) of randomly clumped sperm embedded in and surrounded by an eosinophilic matrix, were found in alopias superciliosus, odontaspis taurus, carcharodon carcharias, isurus o ... | 1994 | 8169955 |
| massive consumption of gelatinous plankton by mediterranean apex predators. | stable isotopes of carbon and nitrogen were used to test the hypothesis that stomach content analysis has systematically overlooked the consumption of gelatinous zooplankton by pelagic mesopredators and apex predators. the results strongly supported a major role of gelatinous plankton in the diet of bluefin tuna (thunnus thynnus), little tunny (euthynnus alletteratus), spearfish (tetrapturus belone) and swordfish (xiphias gladius). loggerhead sea turtles (caretta caretta) in the oceanic stage an ... | 2012 | 22470416 |
| histopathological reactions of the blue shark, prionace glauca, to postlarvae of hepatoxylon trichiuri (cestoda: trypanorhyncha: hepatoxylidae) in relationship to scolex morphology. | postlarvae of the cestode hepatoxylon trichiuri (holten, 1802) were found attached to the surface of viscera of prionace glauca (linnaeus, 1758) taken from atlantic coastal waters off the south coast of massachusetts, usa. gross anatomy of the attachment site shows a quadripartite rim surrounding a deep pit with holes corresponding to the penetration site of each tentacle. hyperplasia of the liver capsule into outgrowths at the attachment site conform to the attachment of the bothridia. the cubo ... | 1998 | 9516995 |
| big catch, little sharks: insight into peruvian small-scale longline fisheries. | shark take, driven by vast demand for meat and fins, is increasing. we set out to gain insights into the impact of small-scale longline fisheries in peru. onboard observers were used to document catch from 145 longline fishing trips (1668 fishing days) originating from ilo, southern peru. fishing effort is divided into two seasons: targeting dolphinfish (coryphaena hippurus; december to february) and sharks (march to november). a total of 16,610 sharks were observed caught, with 11,166 identifie ... | 2014 | 25360274 |
| population trends in pacific oceanic sharks and the utility of regulations on shark finning. | accurate assessment of shark population status is essential for conservation but is often constrained by limited and unreliable data. to provide a basis for improved management of shark resources, we analyzed a long-term record of species-specific catches, sizes, and sexes of sharks collected by onboard observers in the western and central pacific ocean from 1995 to 2010. using generalized linear models, we estimated population-status indicators on the basis of catch rate and biological indicato ... | 2013 | 23110546 |
| development and microstructure of tooth histotypes in the blue shark, prionace glauca (carcharhiniformes: carcharhinidae) and the great white shark, carcharodon carcharias (lamniformes: lamnidae). | elasmobranchs exhibit two distinct arrangements of mineralized tissues in the teeth that are known as orthodont and osteodont histotypes. traditionally, it has been said that orthodont teeth maintain a pulp cavity throughout tooth development whereas osteodont teeth are filled with osteodentine and lack a pulp cavity when fully developed. we used light microscopy, scanning electron microscopy, and high-resolution micro-computed tomography to compare the structure and development of elasmobranch ... | 2015 | 25845614 |
| enzymatic urea adaptation: lactate and malate dehydrogenase in elasmobranchs. | lactate dehydrogenase (ldh) and malate dehydrogenase (mdh) electrophoretic tissue patterns of two different orders of elasmobranchii: carchariniformes (galeus melanostomus and prionace glauca) and squaliformes (etmopterus spinax and scymnorinus licha) were studied. the number of loci expressed for these enzymes was the same of other elasmobranch species. differences in tissue distribution were noted in ldh from g. melanostomus due to the presence of an additional heterotetramer in the eye tissue ... | 2006 | 16497106 |
| assessment of total and organic mercury levels in blue sharks (prionace glauca) from the south and southeastern brazilian coast. | mercury occurrence was evaluated in samples of edible muscle tissue of 27 blue sharks (prionace glauca) caught in the atlantic ocean, adjacent to the south and southeastern brazilian coast, indicating a slight increase in comparison with previous data obtained for the same studied area and being higher than those fish caught at different sites of the atlantic ocean. total hg concentrations ranged from 0.46 to 2.40 mg kg(-1) with the organic hg fraction ranging between 0.44 and 2.37 mg kg(-1). a ... | 2014 | 24801656 |
| gingival neoplasms in a captive sand tiger shark, carcharias taurus (rafinesque), and a wild-caught blue shark, prionace glauca (l.). | | 2004 | 15009246 |
| association of gm4 ganglioside with the membrane surrounding lipid droplets in shark liver. | by tlc, gm4 was found to be the major ganglioside in the liver of six shark species examined: odontaspis taurus, negaprion brevirostris, sphyrna lewini, mustelus griseus, mustelus manazo, and prionace glauca. a detailed analysis of the glycosphingolipids (gsls) in the liver of o. taurus (sand tiger shark) showed that it contained approximately 110 nmol of lipid-bound sialic acid per gram of wet tissue, of which 80% was gm4. by extracting the liver of o. taurus with chloroform/methanol, followed ... | 2002 | 12091485 |
| shark teeth as edged weapons: serrated teeth of three species of selachians. | prior to european contact, south pacific islanders used serrated shark teeth as components of tools and weapons. they did this because serrated shark teeth are remarkably effective at slicing through soft tissues. to understand more about the forms and functions of serrated shark teeth, we examined the morphology and histology of tooth serrations in three species: the tiger shark (galeocerdo cuvier), blue shark (prionace glauca), and white shark (carcharodon carcharias). we show that there are t ... | 2017 | 27353190 |
| comparative study of enzymatic antioxidants in muscle of elasmobranch and teleost fishes. | exercise may cause an imbalance between pro-oxidants and antioxidants. in skeletal muscle, oxygen flow can increase considerably during vigorous exercise. the antioxidant system in athletes contributes to neutralize the concomitant rise in reactive oxygen species (ros) production. the objective of this study was to compare the antioxidant system in muscle of three species of elasmobranchs and teleosts, considering differences in swimming capacity among species within each group and evolutionary ... | 2015 | 25952027 |
| composition of glycosaminoglycans in elasmobranchs including several deep-sea sharks: identification of chondroitin/dermatan sulfate from the dried fins of isurus oxyrinchus and prionace glauca. | shark fin, used as a food, is a rich source of glycosaminoglyans (gags), acidic polysaccharides having important biological activities, suggesting their nutraceutical and pharmaceutical application. a comprehensive survey of gags derived from the fin was performed on 11 elasmobranchs, including several deep sea sharks. chondroitin sulfate (cs) and hyaluronic acid (ha) were found in isurus oxyrinchus, prionace glauca, scyliorhinus torazame, deania calcea, chlamydoselachus anguineus, mitsukurina o ... | 2015 | 25803296 |
| concentrations and hazard assessment of polychlorinated biphenyls and organochlorine pesticides in shark liver from the mediterranean sea. | concentrations of polychlorinated biphenyls (pcbs) and organochlorine pesticides (ddts), were determined in the liver of two different shark species prionace glauca (blue shark) and dalatias licha (kitefin shark) from the mediterranean sea. in blue shark liver, the concentrations of pcbs (2482 ngg(-1)) and ddts (2392 ngg(-1)) were comparable, while in kitefin shark the hepatic concentrations of ddts (4554 ngg(-1)) were significantly higher than those of pcbs (1827 ngg(-1)). contamination levels ... | 2005 | 16115502 |