Author: Robert E. RhoadsPublisher: Springer Science & Business Media
ISBN: 3642651410
Category : Science
Languages : en
Pages : 408
Book Description
Proceedings of the Research Symposium on Complexes of Biologically Active Substances with Nucleic Acids and Their Modes of Action
Author: Robert E. RhoadsPublisher: Springer Science & Business Media
ISBN: 3642651410
Category : Science
Languages : en
Pages : 408
Book Description
Cell Cycle and Cell Differentiation
Author: J. ReinertPublisher: Springer Science & Business Media
ISBN: 354037390X
Category : Science
Languages : en
Pages : 336
Book Description
It is instructive to compare the response of biologists to the two themes that comprise the title of this volume. The concept of the cell cycle-in contra distinction to cell division-is a relatively recent one. Nevertheless biologists of all persuasions appreciate and readily agree on the central problems in this area. Issues ranging from mechanisms that initiate and integrate the synthesis of chro mosomal proteins and DNA during S-phase of mitosis to the manner in which assembly of microtubules and their interactions lead to the segregation of metaphase chromosomes are readily followed by botanists and zoologists, as well as by cell and molecular biologists. These problems are crisp and well-defined. The current state of "cell differentiation" stands in sharp contrast. This, one of the oldest problems in experimental biology, almost defies definition today. The difficulties arise not only from a lack of pertinent information on the regulatory mechanisms, but also from conflicting basic concepts in this field. One of the ways in which this situation might be improved would be to find a broader experimental basis, including a better understanding of the relationship between the cell cycle and cell differentiation.
Nitrogen Fixation in Bacteria and Higher Plants
Author: R.C. BurnsPublisher: Springer Science & Business Media
ISBN: 364280926X
Category : Science
Languages : en
Pages : 198
Book Description
Our knowledge of the biochemistry and biophysics of dinitrogen fixa tion has developed rapidly in the 15 years since the first N2-fixing enzyme system was successfully extracted from a bacterium. This peri od has produced a literature that now describes the N2 fixation reac tion and the nitrogenase enzyme itself in sophisticated terms, though a detailed reaction mechanism at the chemical level has not yet emerged. It is the purpose of the present monograph to present an in-depth re view, analysis, and integration of this research as is possible with a non-contributed publication and to relate this work to considera tions of N2 fixation that reach beyond the confines of the biochem ist's laboratory. The first section is directed as much toward the general science read er as toward the specialist. It covers the agricultural origins of man's interest in N2 fixation and also pertinent areas of taxonomy, physiology, and evolution. Ecological aspects of the subject include a comprehensive evaluation of the nitrogen cycle leading to a sub stantially greater estimate of the rate of global N2 fixation than previous ones. The treatment is of a survey fashion, in part to pro vide a general over-view of N2 fixation and in part to provide context for the biochemistry and biophysics that follow in the second section.
Recent Advances in the Conservation and Utilization of Genetic Resources
Author: Nathan RussellPublisher: CIMMYT
ISBN: 9789686127447
Category : Corn
Languages : en
Pages : 196
Book Description
Current Topics in Microbiology and Immunology / Ergebnisse der Mikrobiologie und Immunitätsforschung
Author: W. ArberPublisher: Springer Science & Business Media
ISBN: 3642652417
Category : Medical
Languages : en
Pages : 223
Book Description
The expression of many bacterial genes adapts itself in an almost in stantaneous and reversible way to specific environmental changes. More specifically, the concentration of a number of metabolites, a function of the amounts of enzymes involved in their synthesis or degradation, in turn retroacts on the rate of synthesis of these enzymes. The genetic bases for this regulation were established by JACOB and MONOD (1961). These authors also showed how the known elements of these regulatory mechanisms could be connected into a wide variety of circuits endowed with any desired degree of stability, in order to account for essentially irreversible processes like differentiation (MONOD and JACOB, 1961). The general principles used by JACOB and MONOD in their study of negative regulation were extended to positive regulation by ENGLESBERG et al. (1965). An independent approach permitted the discovery of positive controls in temperate bacteriophages (see below, III). Each control operation is mediated by a pair of complementary genetic elements (hereafter called "control cell"): a control gene which produces a l control (or regulator) protein and a control site which is the target for the regulator protein. Negative control means that the control protein (repressor) prevents gene expression. One deals with positive control when the control protein (activator) is necessary for this expression. It has become apparent that, as initially postulated by JACOB and MONOD, control of gene expression operates, at least to a large extent, at the transcriptional level.
Progress in Molecular and Subcellular Biology
Author: Publisher: Springer Science & Business Media
ISBN: 3642662498
Category : Science
Languages : en
Pages : 260
Book Description
Acta Microbiologica Polonica
Author: The Indian Journal of Nutrition and Dietetics
Author: Acta Biologica Academiae Scientiarum Hungaricae
Author: Catalog of Copyright Entries. Third Series
Author: Library of Congress. Copyright OfficePublisher: Copyright Office, Library of Congress
ISBN:
Category : Copyright
Languages : en
Pages : 1786
Book Description