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Cell Differentiation - Molecular Basis and Problems (Paperback, Softcover reprint of the original 1st ed. 1982): L. Nover Cell Differentiation - Molecular Basis and Problems (Paperback, Softcover reprint of the original 1st ed. 1982)
L. Nover; Contributions by W. Berg, G Butschak; Edited by M. Luckner, B Parthier; Contributions by …
R3,003 Discovery Miles 30 030 Ships in 10 - 15 working days

Three years have elapsed since the publication of the first edition of this book (in German). The continued interest of our readers and the rapid progress of our knowl edge in many fields necessitates a thoroughly revised and somewhat enlarged new edition. Cell differentiation is a prerequisite of life. It is defined as the prooess leading to the qualitatively and quantitatively selective realization of distinct parts of a given genetic material. Cell differentiation comprises five main aspects: (1) signal reception and transformation, (2) selective rearrangements of the genetic material, (3) differen tial gene expression, (4) organization of gene expression programs and (5) intercellular coordination of cell differentiation within the developmental programs of multicellular organisms. Despite the bewildering multiplicity of its results, i.e., the differentiated phenotypes of cells, there are apparently fundamental similarities with respect to the molecular mechanisms of the process itself. These mechanisms constitute the central subject of this book."

Secondary Metabolism and Cell Differentiation (Paperback, Softcover reprint of the original 1st ed. 1977): M. Luckner, L.... Secondary Metabolism and Cell Differentiation (Paperback, Softcover reprint of the original 1st ed. 1977)
M. Luckner, L. Nover, H Boehm
R2,836 Discovery Miles 28 360 Ships in 10 - 15 working days

1. Secondary Metabolism and Differentiation In addition to the primary metabolic reactions, which are similar in all living beings (formation and breakdown of nucleic acids and proteins as well as of their precursors, of most carbohy drates, of some carboxylic acids, etc. ), a vast number of metab olic pathways lead to the formation of compounds peculiar to a few species or even to a single chemical race only. These reac tions, in accord with CZAPEK (1921) and PAECH (1950), are summed up under the term "secondary metabolism," and their products are called "secondary metabolites. " The wide variety of secondary products formed in nature includes such well-known groups as alkaloids, antibiotics, cardiac glyco sides, tannins, saponins, volatile oils, and others. A consider able number of them are of economic importance in therapeutics or technology. Although secondary products are produced by micro organisms, higher plants, and animals (cf. LUCKNER, 1972), most of the substances are found in the plant kingdom. The lack of mechanisms for true excretion in higher plants may result in this unequal distribution, the "waste products" of metabolism in plants instead being accumulated in the vacuoles, the cell walls, or in special excretory cells or spaces of the organism ("metabolic excretion," cf. FREY-WYSSLING, 1935, 1970; MOTHES, 1966a, b, 1972; LUCKNER et al., 1976. Many secondary substances have, however, a direct biologic func tion. They can be regulatory effectors, e. g."

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