Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 30

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  vitellogenesis
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Types of vitellocytes and vitellogenesis in the Cestoda in relation to different types of embryonic development, ovoviviparity and life cycles

100%
Swiderski Z., Xylander W. E. R.
Wiadomości Parazytologiczne
|
1998
|
tom 44
|
nr 3
2

Histological, histochemical and immunohistochemical study on the growing oocytes of the abyssal teleost Hoplostethus mediterraneus [V]

86%
Calabro C., Albanese M. P., Bertuccio C., Licata A., Gentile N.
Folia Histochemica et Cytobiologica
|
2008
|
tom 46
|
nr 1
97-102
3

Changes in water content in oocytes and ovaries of common frog Rana temporaria L. during vitellogenesis

86%
Guzik M., Schimscheiner L., Zakrzewski M., Zamachowski W., Zysk A.
Acta Biologica Cracoviensia. Series Zoologia
|
1989
|
tom 31
4

Reduced [14C]-methionine uptake and fecundity in Schistosoma mansoni females treated with recombinant tumor necrosis factor alpha in vitro

86%
Haseeb M. A., Agrawal R., Fried B.
Acta Parasitologica
|
2017
|
tom 62
|
nr 1
5

The ultrastructure and the formation of the egg capsule in Isohypsibius granulifer Thulin, 1928 (Tardigrada: Eutardigrada)

86%
Poprawa I., Lipowska A.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2008
|
tom 50
|
nr 1
6

Elektron microscope study on vitellogenesis in Catenotaenia pusilla [Goeze, 1782] [Cyclophyllidea, Catenotaeniidae]

86%
Swiderski Z., Chomicz L., Grytner-Ziecina B., Tkach V. V.
Acta Parasitologica
|
2000
|
tom 45
|
nr 2
The vitellogenesis in Catenotaenia pusilla was examined by means of electron microscopy. Mature vitelline follicles consist of cells in various stages of development, progressing from immature cells of gonial type near the periphery to mature vitellocytes towards the centre. Maturation is characterised by: (1) increase in cell volume; (2) extensive development of large parallel cisternae of GER, the vitelline material producing units; (3) development of Golgi complexes engaged in vitelline material package; (4) continuous fusion of small vesicles into larger vitelline vesicles and fusion of these into 3 very large vesicles, which are characteristic for mature vitellocytes of this tapeworm. Vitellogenesis in C. pusilla is compared with that in other cestodes. Some conclusions concerning the interrelationship between the vitellogenesis pattern and the type of embryogenesis are drawn and discussed.
7

Vitellogenesis in Mosgovoyia ctenoides [Railliet, 1890] Beveridge, 1978 [Cyclophyllidea, Anoplocephalidae]

86%
Swiderski Z., Mlocicki D., Eira C., Miquel J., Grytner-Ziecina B., Mackiewicz J. S.
Acta Parasitologica
|
2005
|
tom 50
|
nr 4
Vitellogenesis in Mosgovoyia ctenoides was examined by means of transmission electron microscopy. Mature vitelline follicles consist of cells in various stages of development, progressing from immature cells of gonial type near the periphery to mature vitellocytes towards the centre. Maturation is characterized by: (1) increase in cell volume; (2) extensive development of large parallel cisternae of granular endoplasmic reticulum (GER), the vitelline material producing units; (3) development of Golgi complexes engaged in vitelline material package; (4) continuous fusion of small vesicles into larger vitelline vesicles and fusion of these into a single very large vesicle, which is characteristic for mature vitellocytes of this tapeworm. Vitellogenesis in M ctenoides is compared with that in other cestodes. Some conclusions concerning the interrelationship between the vitellogenesis pattern and the type of embryogenesis are drawn and discussed.
8

The strategy of eggs deposition by Tetrodontophora bielanensis [Collembola] in the year 1994

86%
Ptak K.
Acta Biologica Cracoviensia. Series Zoologia
|
1996
|
tom 38
9

Ultrastructure and cytochemistry of vitellogenesis in Wenyonia virilis Woodland, 1923 [Cestoda, Caryophyllidea]

72%
Swiderski Z., Mlocicki D., Mackiewicz J. S., Miquel J., Ibraheem M. H., Brunanska M.
Acta Parasitologica
|
2009
|
tom 54
|
nr 2
131-142
Vitellogenesis in Wenyonia virilis was examined by transmission electron microscopy (TEM), including the cytochemical detection of glycogen at the ultrastructural level with the periodic acid-thiosemicarbazide-silver proteinate (PA-TSC-SP) technique. Mature vitelline follicles have cells in various stages of development, progressing from immature cells of gonial type near the periphery of the follicle to maturing and mature vitellocytes towards the centre. Maturation is characterized by: (1) increase in cell volume; (2) increase in nuclear surface area restoring the N/C (nucleo-cytoplasmic) ratio; (3) nucleolar transformation; (4) extensive development of parallel cisternae of GER, the shell-protein producing units; (5) development of Golgi complexes, engaged in shell-granule/shell-globule formation and packaging; (6) synthesis and storage of glycogen in the cytoplasm; (7) simultaneous, independent formation and storage of intranuclear glycogen; (8) continuous fusion of small shell-granules into larger shell-globules and fusion of these into large shell-globule clusters with a progressive increase in the number and size of the latter; and (9) disintegration of GER in the medial layer of vitellocyte cytoplasm, degenerative changes and accumulation of glycogen and shell-globule clusters within the cytoplasm. The functional significance of numerous shell-globule clusters and the relatively small amount of nuclear and cytoplasmic glycogen is analysed. Unlike vitellogenesis of other caryophyllids, the nuclear glycogen of mature vitellocytes in W. virilis is randomly dispersed in the nucleoplasm and never forms a high central accumulation, the so-called “nuclear vacuole”. The nutritive function of vitellocytes appears greatly reduced in W. virilis, a fact perhaps related to the intrauterine development of the early embryos. The ultrastructure of vitellogenesis in W. virilis is compared with that in other lower cestodes, both monozoic and polyzoic. Conclusions concerning interrelationships of the vitellogenesis pattern of the ultrastructural cytochemistry of mature vitellocytes of W. virilis to intrauterine embryonation, absence of uterine glands and an extensive uterus characteristic for this species, are drawn and discussed.
10

Effects of short peptides Led-NPF-1 and Neb-TMOF on the vitellogenesis of Tenebrio molitor beetle

72%
Czarniewska E., Kuczer M., Rosinski G.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2014
|
tom 56
|
nr 1
11

Oogenesis in the teletrophic ovarioles of the apple blossom weevil Anthonomus pomorum [L] [Coleoptera: Curculionidae]

72%
Swiatek P.
Acta Biologica Cracoviensia. Series Botanica et Zoologia. Supplement
|
1997
|
tom 39
|
nr 1
12

Modulation of hepatic chromatin structure in response to 17-beta estradiol induced activation of the vitellogenin gene regions in Atlantic salmon, Salmo salar

72%
Von d. D. A., Waters S.
Acta Biochimica Polonica
|
1993
|
tom 40
|
nr 1
13

Ultrastructure of vitellocytes in the cestode Progrillotia pastinacae Dollfus, 1946 [Trypanorhyncha, Progrillotiidae]

72%
Swiderski Z., Miquel J., Mlocicki D., Neifar L., Grytner-Ziecina B., Mackiewicz J. S.
Acta Parasitologica
|
2006
|
tom 51
|
nr 3
The present study describes the ultrastructure of mature vitellocytes of the trypanorhynch cestode Progrillotia pastinacae Dollfus, 1946 (Progrillotiidae), a parasite of the common stingray Dasyatis pastinaca (Linnaeus, 1758) (Dasyatidae). The vitelline cells of this species measure about 24 μm in length and about 20 μm in width. They have small, elongated, slightly lobulated nuclei, about 4–5 μm in length, with large dense elongated nucleoli and numerous irregularly-shaped dense clumps of heterochromatin. The extensive cytoplasm is rich in numerous cell organelles and cell inclusions. While the perinuclear cytoplasm contains numerous long parallel cisternae of GER, ribo-and polyribosomes, several Golgi complexes and mitochondria, the peripheral cytoplasm contains predominantly three types of cell inclusions: a great number of large lipid droplets, several shell globule clusters, and a very small amount of glycogen-like particles. The most characteristic features of vitellocytes in P. pastinacae are having almost no traces of glycogen and the great number of large, highly osmiophobic lipid droplets representing saturated fatty acids. The presence of large amounts of lipids also in two other trypanorhynchs, Grillotia erinaceus (Beneden, 1858) Guiart, 1927 and Dollfusiella spinulifera (Beveridge et Jones, 2000) Beveridge, Neifar et Euzet, 2004, is in strong contrast to the condition in the most evolved cestodes, Cyclophyllidea, that usually show no trace of lipids.
14

Ultrastructural and cytochemical studies on vitellogenesis in the trypanorhynch cestode Parachristianella trygonis Dollfus, 1946 [Eutetrarhynchidae]

72%
Swiderski Z., Miquel J., Neifar L., Mackiewicz J. S.
Acta Parasitologica
|
2007
|
tom 52
|
nr 2
During vitellogenesis in Parachristianella trygonis Trypanorhyncha, Eutetrarhynchidae) we distinguished four stages: (1) gonial or stem cell stage; (2) early differentiation stage concentrated on protein synthetic activity and shell-globule formation; (3) advanced differentiation stage with main cell activity concentrated on carbohydrate synthesis (glycogenesis) and massive glycogen storage in the form of α-glycogen rosettes and β-glycogen particles; and finally (4) mature vitellocyte stage. Early vitellocyte maturation is characterised by: (1) an increase in cell volume; (2) extensive development of large, parallel cisternae of GER that produce proteinaceous granules; (3) development of Golgi complexes engaged in packaging this material; (4) continuous enlargement of proteinaceous granules within vacuoles and their transformation into shell-globule clusters composed of heterogeneous material. Cytochemical staining with periodic acid-thiosemicarbazide-silver proteinate for polysaccharides indicated a strongly positive reaction for the presence of α-glycogen rosettes and β-glycogen particles in the advanced stage of vitellocyte maturation. Both protein synthesis for shell-globule formation and carbohydrate synthesis or glycogenesis, important storage of nutritive reserves for the developing embryos, observed during cytodifferentiation of P. trygonis vitellocytes overlap in time to some extent. Mature vitelline cells are very rich in three types of cell inclusions accumulated in large amounts in their cytoplasm: (1) shell-globule clusters, playing an important role in egg-shell formation; (2) numerous large lipid droplets, as well as a high accumulation of lipid and α-glycogen rosettes and β-glycogen particles that undoubtedly represent important nutritive reserves for the developing embryos. Despite the fact that the type of vitellogenesis and ultrastructure of the mature vitellocyte in P. trygonis appears to differ to some extent from those of three other trypanorhynch species, its general pattern and ultrastructure greatly resembles those observed in other lower cestodes. Factors that may have contributed to the qualitative and quantitative variation in lipids during vitellogenesis among the four species of Trypanorhyncha, are identified and discussed.
15

Symbiotic bacteroids in the oocytes of anoplurans and mallophagans

72%
Zawadzka M., Bilinski S. M.
Acta Biologica Cracoviensia. Series Botanica et Zoologia. Supplement
|
1997
|
tom 39
|
nr 1
16

Effect of the environmental temperature on the beginning of oviposition in the springtail Tetrodontophora bielanensis [Waga], [Collembola]

72%
Krzysztofowicz A., Jura C.
Acta Biologica Cracoviensia. Series Zoologia
|
1995
|
tom 37
17

Cytochemical and ultrastructural study on vitellogenesis in caryophyllidean cestode Khawia armeniaca [Cholodkovski, 1915]

72%
Swiderski Z., Brunanska M., Poddubnaya L. G., Mackiewicz J. S.
Acta Parasitologica
|
2004
|
tom 49
|
nr 1
Vitellogenesis in Khaxvia armeniaca was examined by means of transmission electron microscopy (TEM) and cytochemical staining with periodic acid-thiosemicarbazide-silver proteinate (PA-TSC-SP) for specific detection of glycogen at the ultrastructural level. Mature vitelline follicles consist of cells in various stages of development, progressing from immature cells of gonial type near the periphery to mature vitellocytes towards the centre. Maturation of vitelline cells is characterized by: (1) increase in cell volume; (2) increase in nuclear surface area restoring the N/C ratio; (3) nucleolar transformation; (4) extensive development of large parallel cisternae of GER, the shell-protein producing units; (5) development of Golgi complexes engaged in shell-granule/shell-globule vitelline material formation and package; (6) formation and storage of glycogen in the cytoplasm; (7) simultaneous, independent formation and storage of intranuclear glycogen; (8) continuous fusion of small shell-granules into larger shell-globules that fuse into large shell-globule clusters with a progressive increase in the number and size of the latter; and (9) degeneration of GER in the medial layer of vitellocyte cytoplasm with degenerative changes and accumulation of glycogen and shell-globule clusters within the cytoplasm, associated with a massive accumulation of glycogen in the nucleus. The functional significance of the large amount of nuclear and cytoplasmic glycogen and numerous shell-globule clusters is analysed. The ultrastructural aspect of vitellogenesis is compared with that in other monozoic and polyzoic cestodes. Conclusions concerning the interrelationships of vitellogenesis patterns and ultrastructural cytochemistry of mature vitellocytes to the various types of embryogenesis, are drawn and discussed.
18

Formation and structure of the egg shell in Raphidia sp.[Raphidioptera]

72%
Jedrzejowska I.
Acta Biologica Cracoviensia. Series Botanica et Zoologia. Supplement
|
1997
|
tom 39
|
nr 1
19

Vitellogenesis in virgin and mated females of the mealworm beetle, Tenebrio molitor

72%
Michalik J., Chojnicka B., Cymborowski B.
Acta Biochimica Polonica
|
1996
|
tom 43
|
nr 4
A comparison between vitellogenesis in virgin and mated females of Tenebrio molitor showed significant differences at each investigated developmental stage. Yolk protein deposition in oocytes, measured as an increase in their size parameters (length, width, and volume), proceeded much faster and was more efficient in mated females as compared to virgins. In fertilized females the gonadotropic cycle showed a cyclicity with an eight-day period while virgin females finish their vitellogenic stage after the first cycle. These differences were reflected in changes in the rate of protein synthesis in the fat body of females completing vitellogenesis or entering the next oogenetic cycle. In the haemolymph, in addition to a large (158 kDa) and two small (56 kDa and 45 kDa) subunits of vitellogenin, there was an abundance of proteins of 80 kDa and 60 kDa.
20

Oogenesis in the panoistic ovary of the primitive stone fly, Leuctra autumnalis

72%
Baran A., Poprawa I., Rosciszewska E.
Folia Morphologica
|
1998
|
tom 57
|
nr 1
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.