Results 171 to 180 of about 7,461 (202)
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Visual pigments in the sea lamprey, Petromyzon marinus
Visual Neuroscience, 1993AbstractWe present microspectrophotometric evidence for the existence of two distinct visual pigments residing in two different morphological types of photoreceptor of the sea lamprey. In the upstream migrant Petromyzon marinus, the pigment found in short receptors has a wavelength of peak absorbance (λmax) of 525 nm, whereas the pigment located in ...
F I, Hárosi, J, Kleinschmidt
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The mitotic chromosomes of the lamprey,Petromyzon marinus L.
Experientia, 1970L'etude des chromosomes somatiques de la lamproie,Petromyzon marinus L. a montre que l'equipment chromosomique diploide de cette espece est compose de 168 chromosomes tres petits, dont queleues-uns des plus grands sont metacentriques. Le chiffre semble representer le plus grand nombre de chromosomes trouve dans une espece de Vertebre.
Potter, I.C., Rothwell, B.
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The six hemoglobins of the sea lamprey (Petromyzon marinus)
Archives of Biochemistry and Biophysics, 1963Abstract The separation and purification of the six lamprey hemoglobins from Petromyzon marinus is reported. These six hemoglobins, which are single-chain, single heme, molecules (mol. wt. = 18,400), differ in their electrophoretic mobilities and isoelectric points.
N M, RUMEN, W E, LOVE
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15α-Hydroxyprogesterone in male sea lampreys, Petromyzon marinus L.
Steroids, 2004There is growing evidence that sea lampreys, Petromyzon marinus L., produce gonadal steroids differing from those of other vertebrates by possessing an additional hydroxyl group at the C15 position. Here we demonstrate that sea lamprey testes produce 15alpha-hydroxyprogesterone (15alpha-P) in vitro when incubated with tritiated progesterone, that ...
Mara B, Bryan +4 more
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Mercury accumulation in sea lamprey (Petromyzon marinus) from Lake Huron
Science of The Total Environment, 2014We determined whole-fish total mercury (Hg) concentrations of 40 male and 40 female adult sea lampreys (Petromyzon marinus) captured in the Cheboygan River, a tributary to Lake Huron, during May 2011. In addition, bioenergetics modeling was used to explore the effects of sex-related differences in activity and resting (standard) metabolic rate (SMR) on
Madenjian, Charles P. +5 more
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Metamorphosis in the anadromous sea lamprey, Petromyzon marinus L.
Canadian Journal of Zoology, 1978A study has been made of metamorphosis in anadromous sea lampreys in New Brunswick between 1973 and 1976. The stages (1–7) commence with the recently described 'prometamorphic ammocoete' (Youson, J. H., G. M. Wright, and E. C. Ooi. 1977. The timing of changes in several internal organs during metamorphosis of anadromous larval lamprey Petromyzon ...
Potter, I.C., Wright, G.M., Youson, J.H.
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Sex pheromones of the sea lamprey (Petromyzon marinus): Steroid studies
Journal of Chemical Ecology, 1987Pheromone-containing and pheromone-devoid samples of male sea lamprey (Petromyzon marinus) urine were analyzed for the concentrations of nine steroids [dehydroepiandrosterone (DHEA), testosterone (T), dihydrotestosterone (DHT), progesterone (P), androstenedione (A), estrone (E1), estradiol (E2), corticosterone (B), and cortisol (F)] by radioimmunoassay
M A, Adams +3 more
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Giant choroidal cells in the lamprey eye (Petromyzon marinus L.)
Experimental Eye Research, 1981Abstract The vascular choroid of the anadromous sea lamprey eye has been examined during both the parasitic and spawning stages of these animals. It was found to be thickest at the posterior pole of the eye, where in young parasites it measures from 350 to 400 μm, while in mature spawning animals it may exceed 1 mm in thickness.
D H, Dickson, D A, Graves
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Thyroid hormone clearance kinetics in adult sea lampreys, Petromyzon marinus
General and Comparative Endocrinology, 1982The clearance kinetics of T3 and T4 were studied in anadromous sea lampreys, 6–7 days after heart cannulation. Continuous sampling from 0.5 to 48 hr after injection of labeled hormones revealed clearance curves characterized by an initial very fast component, disappearing within less than 7 hr, and a slow component that persisted for the duration of ...
C L, Brown +3 more
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Development of Sea Lamprey (Petromyzon marinus) Larvicides
Canadian Journal of Fisheries and Aquatic Sciences, 1980Larvicides are used to control sea lamprey (Petromyzon marinus) in the Great Lakes. These larvicides are useful because they are more toxic to sea lamprey than fish species found in the same habitat. The lampricides come from two classes of chemical compounds: (1) halonitrophenols, and (2) halonitrosalicylanilides.
John H. Howell +2 more
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