Antigenic transformations in Paramecium aurelia,variety 4, stock 51 under the influence of trypsin and chymotrypsin

Exposure of P. aurelia to trypsin and chymotrypsin results in the death of a large percentage of the population. Not all antigenic types are equally affected; antigen types 51B and 51E are most affected by exposure to trypsin, while antigen type 51B is most affected by the action of chymotrypsin. Type 51A does not transform when exposed to either trypsin or chymotrypsin, or after the animals have been removed from the enzyme preparations. Type 51B shows little transformations. Types 51C, 51D and 51E transform readily during and after exposure to these two enzymes. In every instance exposure to the enzymes, followed by growth at 20 °, 27 ° or 32 ° results in the transformation to more type 51A than growth at these temperatures alone. Exposure to chymotrypsin leads invariably to more transformation to type 51A than does exposure to trypsin. Exposure of type 51D to either trypsin or chymotrypsin gives rise to type 51J. The obtained results are analogous with those obtained by transformations, resulting from exposure to antiserum or exposure to different temperatures.     

Paramecium aurelia species complex in the River Raba (southern Poland)

This report reveals a significant acidity of the River Raba at all the investigated sampling points, and rather poor differentiation of the zooplanktonic organisms. At one sampling point the presence of Paramecium biaurelia was registered.     

Species of the Paramecium aurelia complex in Russia (western region of European Russia) with molecular characteristics of Paramecium novaurelia

The presence of P. primaurelia, P. biaurelia, P. triaurelia, and P. novaurelia of the P. aurelia complex was revealed in the studied region of Russia. RAPD-PCR fingerprints (band patterns) of newly identified P. novaurelia strains from Russia were compared to those characteristic for the other chosen European strains of the species. The strains revealed intraspecific polymorphism as several groups of genotypes confirming the existence of polymorphism within P. novaurelia.     

Species of the Paramecium aurelia complex (Protozoa, Ciliophora) in the Middle Sudetes of Poland

Four species of the Paramecium aurelia complex were found in the studied territory (Klodzko Basin) of the Middle Sudetes in Poland, i.e. Paramecium primaurelia, P. biaurelia, P. tetraurelia and P. novaurelia . Of these, P. biaurelia and P. novaurelia appeared with greater frequency than P. primaurelia . Both species dominated over P. primaurelia in the number of determined habitats, as well as in the number of examined clones. Paramecium tetraurelia was rare in the area, being found in only one habitat.