[Experimental investigations on the use of the Polish ultrasonic scalpel in surgery. Introductory information].

A model of the Polish ultrasonic scalpel was developed in 1984. The experimental comparison of cutting and the wound healing of different tissues was the object after using an ultrasonic scalpel and a classic scalpel. The experiments were carried out in 10 rabbits.

[Experimental studies on using new Polish polyester threads as suture materials].

In order to study suitability of new Polish polyester thread in surgery, experimental studies were carried out on rats. Torlene threads were used as sutures of fascia and skin. The process of healing was estimated by microscopic studies from 1 week to 2 months.

The effect of stimuli emitted by sucklings on tactile contact of the bitches with sucklings and on number of licking acts.

Bitches changed abruptly their maternal behavior on 15th and 16th day of the maternal cycle, following an exchange - on the beginning of 15th day - of some puppies from their own litter for other 2-3 days old puppies. The total time of tactile contact with puppies on days 15 and 16 greatly increased as compared with the 13th and 14th day, i.e.

The effect of stimuli emitted by sucklings on the course of their feeding by bitches.

A change in feeding behavior on the 15th and 16th day of the maternal cycle was observed in experimental bitches whose own litter was partly replaced, on the onset of the 15th day, by foster puppies 12-13 days younger. The number of feeding acts and the overall feeding time increased, as compared with the indices for 2 days preceding the exchange of puppies (the 13th and 14th day of the maternal cycle). In the control group, where puppies were not exchanged, no increase in the above behavioral indices was observed on the 15th and 16th day, and they remained at the level recorded on the 13th and 14th day of the cycle.