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Estimation of the relative gene size of yeast mutants

100%

Kopocinski B. , Lachowicz T. M.

Genetica Polonica

1993

tom 34

nr 2

99-108

Fitting a bivariate negative binomial model to the distribution of bird lice [Phthiraptera, Mallophaga] parasitizing the pheasant [Phasianus colchicus L.]

80%

Kopocinski B. , Lonc E. , Modrzejewska M.

Acta Parasitologica

1998

tom 43

nr 2

The frequency distributions of seven lice species: Amyrsidea perdicis megalosoma (Overgaard, 1943), Uchida phasiani Modrzejewska et Złotorzycka, 1977 (suborder Amblycera), Goniocotes chrysocephalus Giebel, 1874, Zlotorzyckella colchici (Denny, 1842), Lipeurus maculosus maculosus Clay, 1938, Reticulipeurus mesopelios colchicus (Clay, 1938) and Lagopoecus colchicus Emerson, 1949 (suborder Ischnocera) parasitizing the pheasant (Phasianus colchicus L.) were characterized with various statistical parameters (mean, range, prevalence and standard deviation) together with three indices of parasite aggregation: parameter α of the negative binomial distribution, coefficient of dispersion (c.d.) as a dispersion to mean ratio (or s/x) and index of discrepancy (D of Poulin’s index). A complex set of measures of aggregations confirmed the aggregated distributions of all parasite species; in all the series analysed the bird lice distributions fit the negative binomial model. Two parameters α and D of Poulin were correlated, i.e. high values of α were associated with low values of D.

Modelling of population dynamics in batch and continuous cultures of Shigella flexneri 3b serovar lysogenic for a plaque-less phage, and S.flexneri 1b serovar which is sensitive to it

80%

Kopocinski B. , Lachowicz T. M. , Niedbach J. , Kawa Z.

Cellular and Molecular Biology Letters

1997

tom 02

nr 3

Population dynamics in batch and continuous culture of Shigella flexneri 3b lysogenic for plaque-less phage X and sensitive to this phag lb serovars have been determined. The abrupt change in the fraction of lysogens resulting from the death, especially of sensitive cells, was observed. The death should result of spontaneous liberation of phage X as concluded from the growth dynamics of the sensitive strain infected with the phage containing bacteria-free filtrate of 3b lysogen. Basing on experimental data mathematical modelling of the dynamics with the use of the differential equation set has been proposed. In the models a qualitative relation between the strains and the phage, estimation of growth parameters and estimated growth curves are given.

Mechanism of antigenic variation in Shigella flexneri bacilli. III. Complement sensitivity of S.flexneri 1b strains and their 3b variants selected either as Lac plus recombinants or phage F2 resistant mutant

80%

Doroszkiewicz W. , Kopocinski B. , Lachowicz T. M.

Archivum Immunologiae et Therapiae Experimentalis

1995

tom 43

nr 1