From the time when fluoroscopic screens were first used there
have been scattered references to reduction in their light output due
to age, use, etc. References are scarce and usually devoid of
quantitative data. A long-range program has been set up in an effort
to arrive at some meaningful information....
Cell division in a heat synchronized Tetrahymena pyriformis
(GL-I) cell can be delayed if the cell is exposed to X-irradiation (300
kVp, 20 mA, HVL = 0. 9 mm Cu, 25 R/ sec) prior to a critical time
after the end of the synchronizing treatment (EST). At the critical
The essays in this collection do not cluster about a specific theme, nor do they present a single unified interpretative approach to issues in the history of American foreign policy. Above all, William Appleman Williams is a teacher. And good teachers are disappointed with conformity. No one would ever come...
In their modern context questions of heredity have come to be
closely aligned with theories of evolution because all such theories
require the presence of heritable variation. Thus the need for an
understanding of a source of variation and a mechanism for its inheritance
became very apparent with the general...