[Characterization of a novel wild-type t(wMPI) haplotype of the house mouse (Mus domesticus L.) from Peru].

Data on molecular genetic analysis of the novel wild-type twMP1 haplotype found in a population of Mus domesticus from Peru are presented. Complementation attribution of the novel haplotype as well as fertility of heterozygotes and transmission ratio distortion (TRD) of the t-carrying chromosome in the progeny of the heterozygous males were studied. Molecular analysis was carried out by means of blot hybridization with the four t-specific probes (Tu48, Tu66, Tu119, and Tu122).

[The solving of the Revecz-Krushinskiĭ test by rats of different genotypes].

Brown Norway rats bred from the original wild stock, KM (Krushinskiĭ-Molodkina) albino rats selectively bred for audiogenic seizure susceptibility, and Wistar albino rats were subjected to Revecz-Krushinskiĭ reasoning test. It determines whether rats can anticipate regular yet invisible shifts of food bait positions. A bait was placed under one of 12 opaque cylinders (arranged in a line) to be tipped by a rat in order to obtain food.

[A model of audiogenic epilepsy--rats of the Krushinskiĭ-Molodkina strain. Proof of genetic homogeneity].

Genetical homogeneity of Krushinskiĭ-Molodkina (KM) stock was studied by the method of reciprocal transplantation of skin. The rats were selected inside genealogic card from 5 different substrains of the 20th generation of brother-sister crossing (F 20). The tail-to-tail transplantation was made by the scheme of double reciprocal ring in 9 females from the KM stock.

[The solving of the Revecz-Krushinskiĭ test by Norway rats].

Reasoning abilities of Norway rats were studied in Revecz-Krushinskiĭ test. In this test 12 opaque plastic cylinders were placed in a row. Rats obtained the bait (sunflower seeds) after tipping the goal cylinder (from the feeder situated under it) independently of the number of one tipped before.

[Effect of a sugar diet on the exhalation of 14CO2 by rats after the administration of citric acid-3-14C].

In rats of three age groups (one month-old rattlings, young 3-month old and adult rats not younger than 5 months) receiving the usual vivarium food the exhalation of C14O2 substantially decreased with the age and the maximum radioactivity of the air following intraperitoneal introduction of citric acid-3-C14 was greatly delayed. Upon putting for 2 months on a cariogenic diet with 54 per cent of saccharose of one month old and 3-month old animals there was noted a significantly accelerated appearance in the expired air of C14O2 and a quicker reaching the maximum radioactivity of the expired air than in controls. It seems that in an accelerated exhalation of C14O2 a definite role is played by the transormation of citric acid in the muscles and blood with the animals kept on a saccharose diet.