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1

A comparison of nucleic acid content in Balantidium coli, trophozoites from different isolates

100%
Skotarczak B., Zielinski R.
Folia Biologica
|
1997
|
vol. 45
121-124
EN
Cytophotometric assays were performed on Balantidium coli trophozoites isolated from 30 pigs affected by acute balantidiasis (Group I) and from 30 pigs with symptom-free balantidiasis (Group II). Trophozoites from cultures obtained from Group I and II pig isolates were assayed for comparison. Comparative cytophotometric studies on nucleic acids of B.coli trophozoites isolated from acute and symptomless balantidiasis-affected pigs as well as from in vitro cultured trophozoites showed differences which could have resulted from diferences between populations in the trophozoans under investigation.
2

Genetic variability in selected Polish population of Dreissena polymorpha (Pallas) (Bivalvia: Dreissenidae)

81%
Zielinski R., Soroka M., Wachowiak-Zielinska M.
Journal of Applied Genetics
|
1996
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vol. 37
|
issue 1
105-120
EN
Genetic variability of a selected population of Dreissena polymorpha an invasive species playing a significant role in aquatic ecosystems was studied.Starch gel electrophoresis was used to analyse 8 enzymatic loci in 200 individuals collected from 20 sites in a lake.The population was found to have 75% of polymorphic loci, 2.8 alleles per locus, 3.5 alleles per polymorphic locus, 0.393 coefficient of expected heterozygosity, and 149 genotypes.Zebra mussel clumps were strongly polymorphic; almost every individual had a different genotype.The hihg polymorphism observed in the Dreissena polymorpha clumps had mostly likely resulted from external cross-fertilization and the presence of free-swiming veliger larvae as well as from a considerable heterozygosity of individual bivalves.Genetic variability of the population studied was found to be similar to that of populations inhabiting other Western Pomeranian lakes, including both highly polluted ones and those formed as recently as about 40 years ago.This provides evidence for a mass colonisation of freshwater reservoires effected by very polymorphic parent populations of Dreissena polymorpha.The literature data on North American zebra mussel populations which invaded that continent about 10 years ago show them to be polymorphic, too, but not as much as European ones.
3

Cytogenetic characterization of the zebra mussel Dreissena polymorpha (Pallas) from Miedwie Lake, Poland

81%
Boron A., Woznicki P., Skuza L., Zielinski R.
Folia Biologica
|
2004
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vol. 52
|
issue 1-2
33-38
EN
Cytogenetic characterization of D. polymorpha was carried out using banding techniques such as C-banding, fluorochrome CMA3 and silver nitrate treatment. The diploid chromosome number of both investigated D. polymorpha forms (typical and albinotic) was the same 2n = 32 (NF = 56). The karyotype consisted of 5 pairs of metacentric, 7 pairs of submetacentric and four pairs of subtelo-acrocentric chromosomes. Ag-NORs were located in the telomeric position on the largest subtelo-acrocentric chromosome pair. C banding patterns indicate many sites of constitutive heterochromatin mainly located in the telomeric regions and interstitially in some chromosomes. CMA3-sites were observed in almost all chromosomes; apart from the Ag-NORs sites, they were located terminally on the chromosome arms and interstitially on three chromosome pairs. Sixteen chromosomes could be counted at the diakinesis stage of meiosis. No differences in banding chromosome patterns were found neither between both analyzed forms of D. polymorpha nor between males and females.
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