1. Further studies on the surface charge of various strains ofTrichomonas vaginalis andTritrichomonas foetus

   • Fernando Costa e Silva Filho
   • Cezar Antonio Elias
   • Wanderley de Souza

   Original Articles Pages: 161 - 176

2. DNA topology in a chromatin model system

   • Franco G. Calascibetta
   • Pasquale De Santis
   • Anita Scipioni

   Original Articles Pages: 177 - 188

3. Promotion of gas bubble formation by ingested nuclei in the ciliate,Tetrahymena pyriformis

   • Barbara B. Hemmingsen

   Original Articles Pages: 189 - 200

4. Identification and isolation of subpopulations of pleural cells by multiparameter flow cytometry

   • B. E. Lehnert
   • J. A. Steinkamp

   Original Articles Pages: 201 - 212

5. NMR relaxation study of water protons in Syrian hamster fetal cells at 300 MHz

   • Wenjuan Xin
   • Sarah A. Bruce
   • Paul O. P. Ts'o

   Original Articles Pages: 213 - 220

6. Announcements

   Announcement Pages: 221 - 221