Results 181 to 190 of about 10,565 (224)

Plasma cells in the ammocoete of Petromyzon marinus

Cell And Tissue Research, 1981
This study demonstrates for the first time the presence of mature and developing plasma cells in the spleen of non-immunized ammocoetes of Petromyzon marinus. Plasmocytes occur as electron-dense cells with much condensed chromatin and an extensively large developed and dilated rough endoplasmic reticulum. The importance of this finding is emphasized in
A, Zapata, C F, Ardavin, R P, Gomariz, J, Leceta   +3 more
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Plasma steroids in the ammocoete of Petromyzon marinus

General and Comparative Endocrinology, 1984
Radioimmunoassays revealed the presence of the following steroids (or immunoreactive steroid fractions) in the plasma of larval sea lampreys: progesterone, corticosterone, cortisol, androstenedione, testosterone, dihydrotestosterone, estrone, and estradiol. Several types of stress served to provoke the release of these substances.
L, Dashow, Y, Katz, M S, Trachtman, A, Epple   +3 more
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Petromyzon marinus Linnaeus 1758

2023
Identification guide to Petromyzon marinus (sea lamprey), and the geographical distribution of that species. Produced by Umberto D'Ancona, 1930. Includes 2 figures.
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Ultrastructure of sinus venosus innervation in Petromyzon marinus

Journal of Ultrastructure Research, 1973
Sections of the sinus venosus from the young adult Petromyzon marinus revealed the presence of numerous axon profiles. These nonmyelinated axons are bound singly or in multiples within Schwann cell sheaths. At points of neuromuscular association, the axon protrudes from an incomplete Schwann cell investment and approaches within 40–50 nm of adjacent ...
T, Beringer, R, Hadek
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Glycoprotein Hormone Receptors in the Sea Lamprey Petromyzon marinus

Zoological Science, 2008
Secretion of the pituitary glycoprotein hormones (GpH) follitropin, lutropin, and thyrotropin in vertebrates is the main mechanism by which neuroendocrine signals are propagated at the level of the peripheral glands, gonads and thyroid. Receptors of these hormones (glycoprotein hormone receptors, GpH-R) evolved from a common ancestor through gene ...
Freamat, Mihael, Sower, Stacia A.
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Meerneunaugen (Petromyzon marinus) in der Dhünn, NRW

Decheniana : Verhandlungen des Naturhistorischen Vereins der Rheinlande und Westfalens, 2001
Im Juni 1998 wurden zwei Adulti des in Deutschland gefährdeten Meerneunauges in der anthropogen überformten Dhünn (Gewässergüteklasse II) beobachtet. Im Juli desselben Jahres konnten wir eine Laichgrube dieser Tiere vermessen und die Strömungsgeschwindigkeit in ihrer Umgebung, an ihrer tiefsten Stelle und über dem Wall bestimmen. Diese ist im Vergleich
Andreas Wünstel, Andreas Mellin, Hartmut Greven   +2 more
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Petromyzon branchialis Linnaeus 1758

branchialis. 3. P pinna dorsali posteriore lineari, labio oris superiore latere lobato. Fn. svec. 274. Rond. pisc. 202. Gesn. pisc. 598. Will. icht. 104. Raj. pisc. 35. Lampetra parva & fluviatilis. Salv. pisc. 63. Lampetra minor. Habitat in aqui: dulcibus Europae, branchiis piscium inharens.
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THE OLFACTORY APPARATUS OF PETROMYZON MARINUS L.

Canadian Journal of Zoology, 1960
The olfactory organ of Petromyzon marinus was studied anatomically and histologically in adult and larval forms and compared with that of related cyclostomes as reported in the literature. The single olfactory organ of this species consists of three parts: the nasal tube, the olfactory sac, and a nasopharyngeal pouch.
H. Kleerekoper, G. A. Van Erkel
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Petromyzon marinus Linnaeus 1758

Published as part of Linnaei, Caroli, 1758, Regnum Animale, pp.
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Petromyzon fluviatilis Linnaeus 1758

fluviatilis. 2. P pinna dorsali posteriori angulata. Fn. svec. 273. Art. gen. 64. syn. 89. spec. 99. Petromyzon unico ordine denticulorum minimorum in limbo oris, prater inferiores majores. Gesn. pisc. 597. Lampreda alterum genus. Salv. pisc. 63. Pryck. Jon s t. p isc. t. 24. f. 6. Pricka. Will. icht. 106. Raj. pisc. 35. Lampetra medium genus.
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