1. An electrophoretic study of human placental homogenates revealed a genetically determined variation of soluble aconitate hydratase.

2. LDH-isoenzymes, several esterases and alkaline phosphatases were found in homogenates of all cell types.

3. Using buffer standards the recovery rate in homogenates of in vitro administered erythromycin decreased with increasing protein concentration.

4. Paraquat was converted to paraquat radical by adding sodium dithionite to tissue homogenates and detected by ESR.

5. Most of the activity is associated with the fat layer obtained after centrifugation of adipose tissue homogenates in the cold.

6. However, fatty acid production is elevated in homogenates of skeletal muscle from pigs and humans susceptible to malignant hyperthermia.