[Aggregation of isolated myofibrils stimulated by their contraction. II. Aggregation mechanism]. / Agregatsiia izolirovannykh miofibrill, stimuliruemaia ikh sokrashcheniem. II. Mekhanizm agregatsii.

Aggregation of contracted myofibrils was studied as a function of experimental conditions at myofibril contraction. The aggregation rate increased at higher concentrations of suspensions and at increased ionic strength of the medium to achieve the maximum at 0.1 M KCL in the last case. The aggregate sizes grow with an increase of ionic strength and concentration of MgATP and reduce with addition of F-actin. Aggregation of myofibrils develops only in the case of their complete or significant contraction. It was suggested that aggregation is stimulated by dehydration of myofibril at contraction.

[Aggregation of isolated myofibrils stimulated by their contraction. I. Origin of the second phase of optical changes during myofibril contraction]. / Agregatsiia izolirovannykh miofibrill, stimuliruemaia ikh sokrashcheniem. I. Proiskhozhdenie vtoroi fazy opticheskikh izmenenii pri sokrashchenii miofibrill.

Aggregation of contracted myofibrils was shown to be responsible for spontaneous: slow reduction of optical density of myofibril suspension on the final stage of their contraction. This effect faded with an increase in light wavelength, with increased angle of view of the photocell and diminished sizes of myofibrils.