[Characteristics of protein kinases from myocardium and their use for studying cAMP content in rat tissues after muscular activity]. / Kharakteristika proteïnkinaz iz miokarda ta vikoristannia ïkh dlia vivchennia vmistu tsamf u tkaninakh shchuriv pri m'iazovii diial'nosti.

Protein kinase from the bull myocardium tissue was separated by means of the stepped gradient of buffer concentrations on DEAE-cellulose. Sensitivity of the obtained fractions to cAMP was studied. Protein kinase isolated at elution by 0.3 M potassium-phosphate buffer from DEAE-cellulose is less sensitive to cAMP than protein kinase isolated according to Kuo. A decrease in the content of cAMP is established in the tissues of the skeletal muscles and adrenals of rats after long physical loading. No statistically significant changes are found in the level of cAMP under the same conditions in the myocardium and brain tissues.

[Physicochemical characteristics of calcium binding with plasma membranes of rabbit skeletal muscles]. / Fiziko-khimichni kharakteristiki zv'iazuvannia kal'tsiiu plazmatichnimi membranami skeletnikh m'iaziv krolia.

It is established that Ca2+ binding with rabbit skeletal muscles plasmatic membrane depends on this cation concentration in the incubating medium. pH, temperature, incubation period and presence of Mg ions in the medium affect the Ca2+-binding ability of sarcolemma. The entropic changes observed in sarcolemma Ca2+ binding are due to conformation reconstructions of the membrane components.