Results 221 to 230 of about 3,510 (271)

Evolution of the nucleolar apparatus during oogenesis in Acipenseridae

Development, 1976
ABSTRACTEvolution of the nucleoli has been followed during oogenesis in the Acipenserid fishes, Acipenser ruthenus (the sterlet) and A. güldenstädti (the sturgeon) using light and electron microscopes. In the ovaries of adults, the oogonial nuclei usually have a single nucleolus with an adjacent mass of paranucleolar fibrillar material.
openaire   +3 more sources

Paddlefish and Sturgeon (Chondrostei: Acipenseriformes: Polyodontidae and Acipenseridae) from Lower Paleocene Deposits of Montana, U.S.A.

Journal of Vertebrate Paleontology, 2020
Paleocene deposits of the Tullock Member of the Fort Union Formation, Montana, U.S.A., have yielded several new specimens of †Polyodon tuberculata, a taxon previously described from the formation, as well as a new genus and species of sturgeon ...
A. Murray, D. Brinkman, D. Demar, G. Wilson   +3 more
semanticscholar   +1 more source

Development of mesonephros in prolarvae of acipenserids (acipenseridae)

Journal of Ichthyology, 2007
Development of the excretory system in early ontogenesis of acipenserids—the Russian sturgeon Acipenser gueldenstaedtii, the starred sturgeon A. stellatus, the sterlet A. ruthenus, and the great sturgeon Huso huso—is investigated histologically. In acipenserids, the mesonephros develops after hatching.
openaire   +2 more sources

A new species of deropristid trematode from the sterlet Acipenser ruthenus (Actinopterygii: Acipenseridae) and revision of superfamily affiliation of the family Deropristidae

, 2020
A new species, Skrjabinopsolus nudidorsalis sp. nov. is described from the sterlet Acipenser ruthenus, caught in the River Volga basin (Russia). This species differs from previously described congeners by the absence of vitelline follicles on the dorsal ...
S. Sokolov, E. Voropaeva, D. Atopkin
semanticscholar   +1 more source

Threatened fishes of the world:Acipenser sturio Linnaeus, 1758 (Acipenseridae)

Environmental Biology of Fishes, 1995
Common names: Common sturgeon (E), Esturgeon commun (F), St& (G) (S), Esturion (SP), Sampi (SF), Steur (NL), Stor (N) (DK), Esturjao (P), Kolan (T), Atlantiskij osetr (R). Conservation status: Endangered, International Red List of IUCN, Bern Convention (Annex III), Red book of threatened species of France (Volume II).
Mario Lepage, Erich Rochard
openaire   +2 more sources

The Use of Microsatellite Loci for Identification of Sturgeon Species (Acipenseridae) and Hybrid Forms

Генетика, 2013
The genetic polymorphism often sturgeon species that inhabit the territory of the Russian Federation (Russian sturgeon, Siberian sturgeon, Amur sturgeon, Sakhalin sturgeon, Persian sturgeon, ship sturgeon, starlet, stellate sturgeon, beluga, and kaluga) was examined at five microsatellite loci (Afug41, Afug51, An20, AoxD161, AoxD165) (in total, 3821 ...
Anna E. Barmintseva, Nikolai S. Mugue
openaire   +3 more sources

Regularities in the Development of Nucleus praeopticus (Np) in Acipenseridae

1978
Early stages in the development of the elements of the peptidergic preoptico-hypophyseal system (PHS), especially those of neurosecretory cells (NSC), have not been studied sufficiently (see YAKOVLEVA, 1974). Only isolated electron-microscopic observations on Teleostei have been reported (FOLLENIUS, 1965).
I. V. Yakovleva, N. A. Efimova
openaire   +2 more sources

Using heat shock protein (HSP) inducers as an approach to increase the viability of sterlet (Pisces; Acipenseridae; Acipenser ruthenus) cells against environmental diazinon toxicity.

Journal of Hazardous Materials, 2023
Sevda Zarei, H. Ghafouri, Leila Vahdatiraad, Vahaid Moghaddam, Tooraj Sohrabi, B. Heidari   +5 more
semanticscholar   +1 more source

Thermal Gel Degradation (Modori) in Sturgeon (Acipenseridae) Surimi Gels.

Journal of Food Science, 2019
Sturgeon meat has been found to be suitable as surimi raw materials. The present study determined the modori phenomenon in sturgeon surimi gels and identified its relationship with cathepsins.
Shuwei Tang, Guangxin Feng, Ruichang Gao, Jiaoyan Ren, Xiaodong Zhou, Haiyan Wang, He Xu, Yuanhui Zhao, M. Zeng   +8 more
semanticscholar   +1 more source

Osmotic and ion regulation in different species of acipenserids (acipenseriformes, acipenseridae)

Journal of Ichthyology, 2006
Species specificity of osmotic and ion regulation in five species of acipenserids connected in varying degrees with sea conditions is investigated. The objects of study were freshwater middle-Volga sterlet Acipenser ruthenus; Siberian sturgeon A.
O. G. Semenova, L. S. Krayushkina
openaire   +2 more sources