| 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 |
| the calicotyle conundrum: do molecules reveal more than morphology? | partial large subunit 28s rdna sequences were obtained for specimens of calicotyle (monogenea: monocotylidae) from eight different host species distributed worldwide to test the validity of some species and to address the question of host-specificity in others. sequences obtained for calicotyle specimens identified as c. kroyeri based on morphological methods from the type-host raja radiata (rajidae) and an additional host r. clavata, both from the north sea, were identical. however, 'c. kroyeri ... | 2001 | 11389337 |
| two new species of paraorygmatobothrium ruhnke, 1994 (tetraphyllidea: phyllobothriidae) from the smooth-hound mustelus mustelus (l.) and the gummy shark m. antarcticus günther (carcharhiniformes: triakidae). | two new tetraphyllidean species, paraorygmatobothrium bai n. sp. and p. rodmani n. sp., are described from the smooth-hound shark mustelus mustelus (linnaeus) and the gummy shark m.s antarcticus günther, respectively. the two species are generally consistent in morphology with the nine existing species of paraorygmatobothrium ruhnke, 1994. p. bai n. sp. and p. rodmani n. sp. differ from the existing species of paraorygmatobothrium in exhibiting gravid proglottids on the strobila. p. bai n. sp. d ... | 2008 | 18815900 |
| biochemical properties of anionic trypsin acting at high concentration of nacl purified from the intestine of a carnivorous fish: smooth hound (mustelus mustelus). | trypsin from the intestine of smooth hound (mustelus mustelus) was purified by fractionation with ammonium sulfate, sephadex g-75 gel filtration, and deae-cellulose ion exchange chromatography, with a 65-fold increase in specific activity and 15% recovery. the molecular weight of the purified trypsin was estimated to be 24 kda using size exclusion chromatography and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (sds-page). the purified enzyme showed esterase-specific activity on n(al ... | 2010 | 20405833 |
| distribution of trace elements in the tissues of smooth hound mustelus mustelus (linnaeus, 1758) from the southern-eastern waters of mediterranean sea (italy). | trace element concentrations (hg, cd, pb, cr, ni, cu, zn) were determined in the muscle, gonads, skin, and brain of smooth hound mustelus mustelus in order to define the metal distribution patterns. the data indicated that metal accumulation depended on the tissues probably as a consequence of metabolic needs, physiochemical properties, and detoxification processes specific for each element. metal concentrations were higher in gonads (hg 0.10-0.70 μg g(-1); cd 0.02-0.10 μg g(-1); pb 0.08-0.39 μg ... | 2011 | 20422281 |
| classification of sharks in the egyptian mediterranean waters using morphological and dna barcoding approaches. | the identification of species constitutes the first basic step in phylogenetic studies, biodiversity monitoring and conservation. dna barcoding, i.e. the sequencing of a short standardized region of dna, has been proposed as a new tool for animal species identification. the present study provides an update on the composition of shark in the egyptian mediterranean waters off alexandria, since the latest study to date was performed 30 years ago, dna barcoding was used in addition to classical taxo ... | 2011 | 22087242 |
| electrophysiological measures of temporal resolution, contrast sensitivity and spatial resolving power in sharks. | in most animals, vision plays an important role in detecting prey, predators and conspecifics. the effectiveness of vision in assessing cues such as motion and shape is influenced by the ability of the visual system to detect changes in contrast in both space and time. understanding the role vision plays in shark behaviour has been limited by a lack of knowledge about their temporal resolution, contrast sensitivity and spatial resolution. in this study, an electrophysiological approach was used ... | 2017 | 28247014 |