Allium cernuum, Vicia faba, and Tradescantia paludosa were treated by root immersion in maleic hydrazide (1 mM/liter) labeled with C(14) (C(14)-MH) for 1 hour to determine the location within the cell to which MH moves during various periods of time after treatment. Root tips were fixed 24 hours, 48 hours, 72 hours, and 3 weeks after treatment. Autoradiographs of root tips squashed 24 to 72 hou...

designated C115 and C117, are inherited as gene differences. C115 and mi-3 both have an excess of cytochrome c but not as great as in poky and both, like poky, are deficient in cytochrome a. The content of cytochrome b is normal in mi-3 and low in C15 but not as low as in poky. Cytochromes a and c have not been detected in C117 but there is an excess of cytochrome b. The three strains grow more...

INCE 1939 when SAX employed the time-intensity factor to determine how S long a chromosome break would remain open and thus be available for interaction with other breaks, many different methods of influencing X-ray-induced chromosomal aberrations have been used in studying the rejoining capacity of broken chromosomes. SAX concluded that high-intensity radiation is more eff ective in producing ...

Agents that lower extracellular calcium concentration (EGTA) or modulate calcium transport (lanthanum or D600) have been applied to dividing stamen hair cells of Tradescantia and analyzed for their ability to change the following: (a) the time required to progress from nuclear envelope breakdown to the onset of anaphase (metaphase transit time), (b) the time required to progress from anaphase t...