Biophysical considerations concerning gravity receptors and effectors including experimental studies on Phycomyces blakesleeanus.

Part I. Migration and Diffusion of Graviceptors: The physical action of gravitational and inertial forces on graviceptors is considered. The motion of graviceptors as influenced by physical dimensions, density, electric charge, composition of the suspending medium and flow variables is demonstrated.

Radiological physics characteristics of the extracted heavy ion beams of the bevatron.

Studies of the depth-ionization properties and the biological effects of heavy ion beams produced at the bevatron have extended work previously done with less energetic beams from other sources. Results indicate that heavy ion beams are suitable for tumor therapy, studies relating to space biology, and fundamental radiobiology.

Visual phenomena noted by human subjects on exposure to neutrons of energies less than 25 million electron volts.

Six subjects reported multiple starlike flashes and short streaks on exposure to neutrons of energies up to 25 million electron volts. The probable mechanism is interaction with the retinal rods by proton recoils and by alpha particles released from neutron reactions with carbon and oxygen. These observations are similar to light flashes and streaks seen by astronauts who are exposed to high-energy cosmic rays on translunar flight.

Electrical coupling: low resistance junctions between mitotic and interphase fibroblasts in tissue culture.

Dividing cells of chick embryonic fibroblasts and of mouse embryonic fibroblasts (3T3) in tissue culture are electrically coupled to their interphase neighbors. Recordings from many such cells suggest that this coupling persists throughout the division cycle of the mitotic cell.