Titlebook: ;

冷漠

Conclusions: Transrational Hoped evolution and in plant breeding (mutation breeding). These include the widely used physical mutagens X-rays, .-rays, neutrons, and .-rays; the potent alkylating compounds ethyl methanesulfonate (EMS), diethyl sulfate (dES), and ethyleneimine (EI); and nitroso compounds, nitroso ethylurethane (NEH)

放纵

present when the insult is given, and (b) postreplication repair, observed in the daughter strands synthesized after the insult. Recovery and repair in human cells have been measured in a number of ways: (a) by a decrease in reproductive death with dose fractionation (1), (b) by unscheduled DNA synt

终点

欢呼

Cytokinins in Regulation of Plant Growthen them may modulate metabolism and bring about morphogenesis and functional changes characteristic of normal ontogeny. In this context, I wish to discuss the group of substances referred to as cytokinins.

跟随

Introductory Address was then known about tissue transplant. It does not really matter whether or not any of the spectacular advances in that field during the past decade had anything to do with that first meeting. The one important fact for us, and our America, is that with that event a series of annual meetings was s

FLORA

Recent Studies on the Origins of Cellular Organellesry in these organelles of DNA and of biochemical systems for the synthesis of DNA, RNA, and protein has raised not only the problem of the extent of organelle autonomy within cells but also the possibility that these organelles arose as invasive prokaryotic symbionts. This chapter summarizes the pre

窒息

Some Molecular Aspects of Mitochondrial Complementation and Heterosiserosis, the gene product and its function, or the biochemical systems involved in the accomplishment of heterotic phenotype. The latter two, together with information on the rate of formation of the final product, should be a guide for more meaningful studies of heterosis. The ultimate aim of such s

防锈

阉割

Genetic Regulatory Mechanisms in the Fungis of . (1). Leucine represses the first enzyme, .-isopropylmalate synthetase (the synthetase), the product of the . cistron. The synthetase catalyzes the production of .-isopropylmalate (.-IPM), which is the second signal—an obligate inducer for the synthesis of .-IPM isomerase (the isomerase) and .

barium-study