[Studies on diarrhea of young calves. 1. Quantitative analysis of the gastrointestinal flora in clinically healthy calves and in calves with diarrhea].

Quantitative composition of gastro-intestinal-flora was determined in 23 clinically healthy calves and the course of germ spreading was followed up. In comparison with these healthy animals in 25 diarrhoea affected calves at the age of 4 to 17 days there could be observed signigicant differences only in few parts of the gastro-intestinal-tract concerning the quantitative composition of germ flora. Only in 3 animals enterotoxin producing E coli strains could be detected.

[Animal experimental investigations of the electrophysiologic parameters of 'fast fibers' of extraocular muscles by means of glass microelectrodes (author's transl)].

The author reports on animal experimental investigations of the electrophysiologic parameters of 'fast fibers' of extraocular muscles in rabbits in vivo by means of standardized glass microelectrode. The submitted results of investigation enlarge our knowledge of the electrophysiologic parameters of 'fast fibers'. The statistically analyzed results on musclefiber action potential parameters, on musclefiber membrane resting potentials, strengthduration curves and the data on the electro-mechanical latency period of 'fast fibers' are illustrated by figures.

[Electrophysiologic evidence of three different types of the 'slow fibers' of extraocular muscles (author's transl)].

The author reports on electrophysiologic investigations of extraocular muscles in rabbits in vivo by means of standardized glass microelectrodes. The results of investigation on muscle-fiber membrane resting potentials of 'slow fibers' as well as on postsynaptical potentials of 'slow fibers' are analyzed after having elucidated the problems as well as the methods employed and the experimental setup. By figures and synopses in tabular form the author illustrates the electrophysiologic parameters of three different types of muscle fibers of 'slow fibers' of extraocular muscles that can with certainty be differentiated electrophysiologically.

[Animal experimental investigations for determining the duration of the "mechanical-effective period" of muscle action potentials and of the "electro-mechanical latency period" of "fast fibres" of external ocular muscles (author's transl)].

A report is given of an animal experimental study for determination of the duration of the "mechanical effective period" of the muscle fiber membrane action potential and the "electromechanical latency period" of "fast fibers" of the external ocular muscles in rabbits in vivo. The studies were carried out with an internationally standardized glass microelectrode technique. The statistical values are based on 250 tests employing the superposition technique.

[Coagulation analytical studies in coli enterotoxemia in swine].

Store pigs with spontaneous outbreaks and experimental endotoxin shock were kept under observation in the context of coagulation analysis. Heparin was applied to some of the animals to disrupt the plasmatic coagulation system. The thrombocyte count in animals with endotoxin infusion declined by some 50 to 65 percent of the original level.

[Quantitative composition of the gastrointestinal flora in the young pig].

Studies were conducted into the quantitative composition of the gastro-intestinal flora in clinically intact store pigs. The methods are described in greater detail, followed by presentation of results. In the discussion particular reference is made to literature.

[General adaptation syndrome (Selye) in cattle. 6. Influence of stress conditions on antibody levels after active and passive immunization as well as on the topographic distribution of various groups of pathogens in the gastrointestinal canal].

The action of experimental and natural stressors on the humoral immune response of calf was studied. Particular attention was given to the H-antigen of S.dublin and equine erythrocytes,the degradation rate of passively acquired humoral antibody, as well as the quantity and topographic distribution of certain groups of germs in the gastrointestinal tract.

[Artificial intranasal bacterial invasion in the newborn calf. 2. Artificial bacterial invasion using gram-positive and gram-negative strains].

A micrococcal and a diplocaccal strain isolated from the nasal space of a clinically intact nursed calf were used for artificial bacterial invasion in the first phase of the experiment. Application of bacterial suspension prepared from those strains had no effect upon the rise of coli counts in the nasal secretion of nursed calves during their first days of age nor upon the morbidity or mortality of all 677 test animals in comparison to 665 controls. Therefore, an avirulent E.

[Artificial intranasal bacterial invasion in the newborn calf. 1. Quantitative assessment of nasal secretion for certain groups of bacteria].

A technique has been developed for quantitative assessment of nasal secretion for the presence of specified groups of bacteria, as a contribution to microbiological treatment of the problem of artificial intranasal bacterial invasion in newborn and nursed calf. Some 10(6) to 10(7) bacteria were recorded from each gram of nasal secretion in calves exposed to natural bacterial invasion. Micrococci and green diplococci were very rare, with only 10(3) to 10(4) or hardly up to 10(5) bacteria per gram of nasal secretion.

[Immuno-prevention of coli infections in swine using live vaccine. 1. Use in coli infections during the 1st days of life].

Live vaccine prepared from streptomycin-dependent mutants of E. coli was well tolerated in various doses and at various times of administration, for there were no adverse reactions. There was no evidence of reversion to a virulent form.

[Report on the experience in intracellular microelectrode studies of the external eye muscles with the stereotactic surgical device SESH-2].

The Soviet SESH-2 stereotactic surgical device for micro-electrode examinations offers technical advantages in the derivation of the intracellular muscle fibre membrane potential after resting and of the intracellular potential of the peripheric ocular muscles after irritation as well as in the study of the central irritation of the nuclei of the ocular muscles. The coupling of two hydraulic micromanipulators permits to perform in vivo various investigations of the ocular muscles by means of micro-electrodes. The numerous possibilities of variation and assembly according to the modular principle allows also simultaneous studies on ocular muscle mechanics.