[Biotension of the corneal tissue preserved in a nutrient medium for tissue cultures at 4 degrees C].

The biotension generated by cells and tissues is connected quite well with the intensity of the metabolic processes in them and in seems that it is affected considerably by a series of external factors-temperature, salt content ect. For the purposes of transplantation in the present investigation the authors examined the effect of the nutritive medium for tissue cultures T-199 on the investigated biotension of the corneal tissue during the period of its preservation. They carried out studies on 335 corneas and the results were estimated statistically.

[Measurement of the Na2 35S04 in donor cornea with a view to assessing its biological properties].

The authors carried out studies on 425 pig cornea, conserved in a modified solution for tissue cultures at 4 degrees C. The intensitivity for incorporation of Na235SO4 in this nutritive medium gave higher percentage than the preservation of cornea in moist chamber.

[Electron microscopic study of preserved skin].

The ultrastructure of normal and preserved skin of rabbits breed "chin-chill" has been investigated. The authors state that when the skin is preserved under given conditions for 20 days, the intracellular changes of the epithelium and connective tissue have a reversible character, but after 30 day preservation under the same conditions the connective tissue shows deep pathological changes. The authors conclude that the electronic microscopic investigations give a more complete characteristics for the fitness of the tissues for transplantation, as compared with other methods.