[Effect of ammonium ions on calcium release from fragmented sarcoplasmic reticulum]. / Vliianie ionov ammoniia na vykhod kal'tsiia iz fragmentirovannogo sarkoplazmaticheskogo retikuluma.

It is established that in AMP deamination by sarcoplasmic reticulum fragments there occurs an intensified release of the previously accumulated calcium. UMP has no noticeable effect on this process. The level of accumulated 45Ca+ in the fragmented sarcoplasmic reticulum is decreased when ammonium ions load is introduced into the medium. If the sarcoplasmic reticulum fragments were loaded with 45Ca2+ and then washed off and incubated in the isotonic sucrose solution, the calcium release is more intensified when ammonium ions are introduced into the medium. The results of ultrasound and A23187 treatment of the membranes evidence for the calcium release from the inner space of vesicles.