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1

The NOR and nucleolus in the spermatogenesis of Psylla alni (L) (Homoptera) analysed by silver staining

100%
Maryanska-Nadachowska A., Warchalowska-Sliwa E., Kuznestsova V. G.
Folia Biologica
|
1992
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vol. 40
|
issue 1-2
41-45
EN
Ag-staning of permatocytes of Psylla alni (2n=25) suggests that the organizer regions (NOR) are present in a pair of medium size autosomes. NOR activity was observed throughout the meiotic prophase including diakinesis.
2

Reproductive performance of a transgenic boar carrying the bovine growth hormone gene (bGH)

80%
Rejduch B., Slota E., Sysa P., Rozycki M.
Journal of Applied Genetics
|
2002
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vol. 43
|
issue 3
337-341
EN
The aim of this study was to obtain information on the possible influence of the bovine growth hormone gene (bGH) on gametogenesis and reproductive parameters of a 2-year-old Polish Landrace transgenic boar. The bGH gene construct had been introduced into the zygote of the boar with the use of the microinjection technique. On the basis of the available documentation we established that the fertility of the investigated transgenic (bGH) boar was low in comparison with other animals of the Polish Landrace breed, with a poor libido, ineffective matings and, on average, 3 live piglets less per litter. Samples of testis tissue from the boar were obtained after castration. In total, we observed 100 spermatocytes and all of them had normally paired bivalents. It is possible that the boar?s lower fertility was caused by some, as yet unknown factor.
3

The influence of peat extract on the seminiferous epithelium of mouse testes

80%
Bartmanska J., Schuetz A.
Folia Biologica
|
1992
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vol. 40
|
issue 1-2
83-89
EN
Because of the interest in the peat extract as a potential therapeutic agent its effect on the seminiferous epithelium cells was studied. Adult male mice were intraperitoneally injected with peat extract during 34 days. At intervals equal to the duration of the cycle of the seminiferous epithelium (every 8.5 days)., gametogenic cells were quantitatively analysed. It was revealed that the peat extract causes a decrease in the production of the A1 spermatogonia, and as a result a decrease in the intensity of spermatogenesis>. Besides, in some individuals disturbances of meiosis took place, leading to an increased degeneration of pachytene spermatocytes and formation of diploid speramtids.
4

C-banding patterns in chromosomes and sperm of Strophosoma capitatum (De Geer, 1775) (Coleoptera: Curculionidae, Brachyderinae)

70%
Rozek M., Holecova M.
Folia Biologica
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2000
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vol. 48
|
issue 1-2
33-35
EN
An analysis was made of the C-banded karyotype of Strophosoma capitatum (Deg.). The results indicate that the chromosome number is 2n=22 and n%=10+Xyp. The examined karyotype shows a pericentromeric position of constitutive heterochromatin in all autosomes. The shorter arm of the X chromosome is heterochromatic while the y chromosome is wholly euchromatic. Successive stages of spermatogenesis were analysed.
5

Karyotype and pattern of sperm of Apteranabropsis tonkinensis (Rehn 1906) (Orthoptera: Stenopelmatoidea: Mimnermidae)

70%
Warchalowska-Sliwa E., Maryanska-Nadachowska A., Gorochov A. V.
Folia Biologica
|
1999
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vol. 47
|
issue 1-2
21-23
EN
The karyotype of Apteranabropsis tonkinensis, described for the first time, is characterized by 2n_= 19 (XO) and 2n_=20 (XX). Successive stage of spermatogenesis were analysed.
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