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

Znaleziono wyników: 29

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

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

Gonad of Helix pomatia in annual cycle

100%
Juchno D.
Folia Malacologica
|
1999
|
tom 07
|
nr 4
2

Stages of gametogenesis in the snail, Helix pomatia [Gastropoda, Pulmonata]: cytological and ultrastructural studies

100%
Juchno D.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2000
|
tom 42
|
nr 1
3

Reproduction and fecundity of the golden loach, Sabanejewia baltica Witkowski, 1994 from Bug River in Poland

63%
Juchno D., Boroń A.
Reproductive Biology
|
2012
|
tom 12
|
nr 1
4

Age, reproduction and fecundity of the spined loach Cobitis taenia L. (Pisces, Cobitidae) from Lake Klawoj (Poland)

63%
Juchno D., Boron A.
Reproductive Biology
|
2006
|
tom 06
|
nr 2
5

Size and number of oocytes of the spined loachCobitis taenia L. and natural polyploids of Cobitis (Pisces, Cobitidae)

63%
Juchno D., Boron A.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2004
|
tom 46
|
nr 1
6

Reproduction ability of tetraploid Cobitis [Pisces, Cobitidae] males

63%
Juchno D., Boron A.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2006
|
tom 48
|
nr 1
51
7

Histological analysis of the annual cycle of gonad development in the male spin-cheek crayfish Orconectes limosus Raf.

63%
Chybowski L., Juchno D.
Archives of Polish Fisheries
|
2002
|
tom 10
|
nr 2
Histological analyses were conducted of the annual cycle of male gonads of spiny-cheek crayfish Orconectes limosus Raf. Although changes in the male gonads throughout the year are clearly evident, they are not uniform in all males. Spiny-cheek crayfish mate mainly in the autumn from September to November. After mating, the gonads of male crayfish can be divided into two groups according to their histological structure. In the first group there is an abundance of sperm in the gonads, while the testicular tubules in the second group are either empty or contain a small amount of sperm. This division remains until May. In May, the histological picture of the gonads is uniform, and there are either very few or no tubules containing sperm. In June O. limosus males occur in two forms. The histological pictures of first- and second-form male gonads do not differ. However, beginning in July and also in August and September, the gonads of first- and second-form males do differ. First-form male crayfish gonads contain more sperm than those of second-form males. From October onwards, all of the males are first-form, and primarily spermatids and sperm are visible in the gonads. The possibility that the spiny-cheek crayfish mates twice annually, once in autumn and again in spring, is discussed based on changes observed in the histological picture of the gonads.
8

Histological analyses of gonad development in female spin-cheek crayfish Orconectes limosus Raf.

63%
Juchno D., Chybowski L.
Archives of Polish Fisheries
|
2003
|
tom 11
|
nr 1
Histological analyses were preformed to investigate the annual cycle of the ovaries of female spiny-cheek crayfish Orconectes limosus Raf. (Crustacea). In May, the crayfish ovaries were filled mainly with oocytes in the initial stage of development (previtellogenic oocytes). The histological picture of the ovaries indicated the presence of empty follicles and mature oocytes undergoing resorption. In the summer months, the volume of the oocytes gradually increased and surplus substances material began to be synthesized (phase I or endogenous vitellogenesis). The histological picture of the ovaries in August was varied; some of them contained previtellogenic and vitellogenic oocytes in phase I, while others contained mainly oocytes in phase II of vitellogenesis when the cytoplasm fills with yolk and lipid globules. In fall, winter and spring the ovaries of crayfish O. limosus were filled mainly with oocytes in phase II of vitellogenesis; these were gradually increasing in volume. The annual gonadosomatic index (GSI) was calculated in the range of 0.41 to 5.83. The percentage of previtellogenic to vitellogenic oocytes prior to spawning was 23:77, and following spawning it was 70:30.
9

Oogeneza mieczakow [Mollusca]

63%
Juchno D.
Przegląd Zoologiczny
|
2001
|
tom 45
|
nr 3-4
187-196
10

Mitotic and meiotic chromosomes of the Great Rams Horn Snail Planorbarius corneus (Linnaeus, 1758) (Gastropoda, Planorbidae) from Lake Kortowskie

51%
Szabelska A., Juchno D., Spoz A., Boron A.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2014
|
tom 56
|
nr 1
11

Early development and post embryonic skeletal morphology of the progeny of Cobitis taenia (Teleostei, Cobitidae) and its naturally occurring allotriploids

51%
Juchno D., Boron A., Szlachciak J., Kujawa R.
Folia Biologica
|
2016
|
tom 64
|
nr 3
12
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Abundance and distribution of populations of Helix pomatia L., 1758 in warminsko-mazurskie voivodeship

51%
Juchno D., Boron S., Boron A.
Folia Malacologica
|
2015
|
tom 23
|
nr 1
13

Early development of the skeleton of cobitid fishes (Teleostei, Cobitidae)

51%
Szlachciak J., Juchno D., Boron A., Kujawa R.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2014
|
tom 56
|
nr 1
14

Gonadal development of allotriploid Cobitis females (Pisces, Cobitidae)

51%
Juchno D., Boron A., Kujawa R.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2008
|
tom 50
|
nr 1
15

The oocytes size of Carassius gibelio (Pisces, Cyprinidae) diploid and triploid females

51%
Przybyl A., Orych P., Juchno D., Boron A.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2018
|
tom 60
|
nr 1
16

Mitotic and meiotic chromosomes of the great ramshorn snail Planorbarius corneus (Linnaeus, 1758) (Gastropoda, Planorbidae) from Lake Kortowskie

51%
Szabelska A., Juchno D., Spoz A., Boron A.
Polish Journal of Natural Sciences
|
2015
|
tom 30
|
nr 1
An analysis of meiotic and mitotic chromosomes of P. corneus inhabiting Lake Kortowskie was made in order to verify the use of different tissues and colchicine treatments, the hypotonization time and two methods of chromosome slide preparation. In total, 30 chromosomal slides of six individuals were analyzed. The well spread chromosomes were introduced onto the slides by dropping a cell suspension of the mantle epithelium, foot and intestine of each individual, directly injected with colchicine, after 20 min of hypotonization. The karyotype was composed of 2n=36 biarmed chromosomes, thirty metacentrics with the rest being submetacentrics, NF=72. In the slides of the gonads the meiotic chromosomes in spermatogenesis were observed as being in prophase I (leptoten, zygoten, and diakinesis) and in telophase I. In diakinesis 18 bivalents were formed. No disturbances were observed during meiosis. The spermatozoa were typical of aquatic molluscs; consisting of a spherical head, a short midpiece and a long tail.
17

Global DNA methylation during early development of Cobitis diploids - preliminary studies

51%
Kowalewska K. M., Juchno D., Przybyl A., Boron A.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2018
|
tom 60
|
nr 1
18

Embryonic development of gynogens of triploid Cobitis females (Teleostei, Cobitidae)

51%
Juchno D., Kujawa R., Grabowska A., Boron A.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2010
|
tom 52
|
nr 1
19

Reproductive ability and embryonic development of Cobitis hybrids (Pisces, Cobitidae) with different ploidy levels

51%
Juchno D., Boron A., Przybyl A., Kowalewska K.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2018
|
tom 60
|
nr 1
20

Farming and histological effects of gonadotropin stimulation in edible snails of the Helix genus

51%
Lysak A., Ligaszewski M., Mach-Paluszkiewicz Z., Juchno D.
Annals of Animal Science
|
2002
|
tom 02
|
nr 2
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.