By John G. Torrey (auth.), Morton W. Miller, Charles C. Kuehnert (eds.)
These court cases are composed of 3 components: 1) the indi vidual papers, 2) their discussions, and three) a retrospective summa tion of the meeting's deliberations. If we have been to indicate a commence ing position for analyzing it'll most likely be the summation --it at tempts to put a few of the papers and discussions right into a basic context and to indicate correct rules of present wisdom and of probably worthwhile avenues for additional learn. The papers and discussions deal extra in particular with the indiviaual subject matters. it truly is was hoping that the tone and tenor of the assembly are a few what mirrored in its lawsuits. The emphasis this present day in organic learn is kind of "ecumenical" in outlook in that frequently thoughts and conclusions from one self-discipline have relevance and applicability to a different. for instance, the elucidation of the DNA man made level in the course of interphase was once first finished with botanical fabric; this system has given that had a large and demanding function in clinical learn. additionally, the pioneering and now classical reports concerning the results of ionizing radiation on plant chromosomes have been, and nonetheless are, the basis for learning mammalian chromosomes: it re quired merely the invention of a hypotonic medium to accomplish spreading of them in order that related forms of analyses have been attainable. crops and plant cells have many designated beneficial properties which permit them to be important both for the research of particular botanical difficulties, or for learning vast organic principles.
Read Online or Download The Dynamics of Meristem Cell Populations: The Proceedings of a conference jointly organized by the Department of Radiation Biology and Biophysics, The University of Rochester, and the Department of Biology, Syracuse University, and convened at Rochester, PDF
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Extra info for The Dynamics of Meristem Cell Populations: The Proceedings of a conference jointly organized by the Department of Radiation Biology and Biophysics, The University of Rochester, and the Department of Biology, Syracuse University, and convened at Rochester,
HOURS) Fig. 3. Cycle kinetics of a synchronized GI/S population in the root tip of Pisum. ( ) percent of interphase cells synthesizing DNA~r release into the S stage of the cycle; (-------), appearance of a GI/S population at mitosis. 5 hr on the graph. For labeled interphase cells, each data point is that fraction of cells labeled after a 30 min pulse with 3H-TdR. 22 J. VAN'T HOF AND C. J. KOVACS cells must have stopped temporarily in G2. P. G1 cells which were delayed in G1, the synchronized G1/S cells were delayed in G2.
VAN'T HOF AND C. J. YH ROOT MERISTEM CELLS 1. Located in Gl and G2 and function independently in the same cell. 2. "Sphere of influence" confined to Gl and G2. 3. Unidirectional, oriented toward mitosis. 4. Resolved when protein for the sitions are deficient. 5. Require aerobic metabolism for expression. Gl~S and G~M tran- 6 •• Sensitive to ionizing radiation. 7. Capable of recovery after damaged by ionizing radiation. REFERENCES 1. Brown, R. (1951) The effects of temperature on the division of different stages of cell division in the root-tip.
A) The entrance of cells from Gl into S expressed as the increase in labeled interphase cells. Solid circles, control; open circles, irradiated. b) The appearance of former Gl cells in mitosis expressed as an increase in number of labeled mitotic figures. 21 MITOTIC CYCLE REGULATION In Fig. 3 are shown the results obtained with cells synchronized at the GI/S boundary. At time zero those represented by the open circles were irradiated with 300 R of y-rays and sucrose was provided to release the cells into S.
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