[Influence of the Mother on the Behavior of Young Rabbits during the Prepubertal Period].

In this study, we investigate the influence of a mother on the behavior of young rabbits during the prepubertal period. It is shown that the presence ofthe mother affects the ratio of types of activity in offspring and the mother can demonstrate behavioral patterns to suppress aggressive behavior in offspring. It was found that rabbits in the prepubertal period continue to have active contact with their mother and make successful attempts at sucking.

Fine structure of the stability diagram and the amplitude of ion oscillation within hyperboloidal mass spectrometers.

This article shows that the dependence of the amplitude of ion oscillation within a hyperboloidal mass spectrometers (HMS) as a function of working point location on the stability diagram (in this case all working points lie at one scan line) exhibits a structure with spikes: the amplitude decreases drastically in some points and these dips look like 'reversed spikes'. It is shown that the dips appear at particular values of the stability parameter, beta(0), that correspond to intersections of the scan line with lines of parametric resonances (quasistability lines) described by us previously. This effect governs the trapping efficiency of ions injected into a radio-frequency ion trap from an external source.

[Immunologic disorders in mice reared by mothers with induced graft vs host reactions].

The mice fed by foster mothers with the induced graft-versus-host reaction showed high lethality at the age of 2-3 months and second year of life. During the second month of life the sick progeny exhibited lymphopenia, delayed skin allograft rejection, diminished number of T lymphocytes in the spleen and lymph nodes, depressed immune response to erythrocytic and abdominal typhi Vi-antigen. The immune response in old mice was elevated.

[Role of genetic differences between mother and fetuses in the development of the graft vs host reaction induced in the mother].

The development of the graft-versus-host reaction (GVHR) was studied in female (CBAxC57BL)F1 mice during pregnancy, after delivery or before mating with syngeneic, semisyngeneic and allogeneic males. It was found that the results in females depend on genetic differences between the donors of injected lymphoid cells and fetuses, as well as on the time of inducing GVHR. If lymphoid cells from C57BL/L mice were injected to (CBA X C57BL) females after delivery or before mating with CBA males of the parental strain, the gravidity promoted the enhancement of GVHR.