The disappearance rate of intraventricular bradykinin in the brain of the conscious rat

To explore the possibility that cyclic nucleotides control green algal growth and division, $\text{Chlamydomonas}$ chemostat cultures were assayed for cyclic nucleotides. Substantial qualities of cAMP were found in cells and in extracellular millieu. Most cGMP molecules were extracellular. Slowing cell growth by slowing chemostat dilution caused reversible changes in cellular morphology and cyclic nucleotide levels. During slowed growth cAMP level increased dramatically; cGMP level decreased. New cells resulting from division were not released from original cell wall.