Titlebook: Lectures on Developmental Physiology; Alfred Kühn Textbook 1971 Springer-Verlag Berlin Heidelberg 1971 Drosophila.Endoderm.Hydra.Regenerat

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Lecture 6,ion of which single cells are capable and the great extent to which an organism can establish separate functional structures without dividing itself into cells. The course of development in an individual cell and in a sequence of cell generations can be laid out in a strict sequence and thus lead di

Favorable

Lecture 7,larity; but in nature there are also go od-sized organisms which are not organized into cells, but in which a variety of “ organs” and reproductive events occur in a single individual. Most often this increase in size is connected with the presence of many nuclei in an undivided cytoplasmic mass; wh

Defiance

Lecture 8,lant Protista. In many cases, it is a matter of definition as to whether one calls something a colony of single-celled individuals or a single multicellular organism. The bases of such a decision may include the ability of isolated cells to survive, the degree of organization into tissues, and the d

Ornament

Offbeat

Irrepressible

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Lecture 12,m. We call such a layer of morphologically still undifferentiated cells a blastema (F. E. .). It is characteristic for many phyla that, in the development of the germ layers and organs, such cell layers, rather than individual cells, play the main role. From the primitive blastema of the blastoderm,

Malleable

Lecture 13,alization either of materials or of metabolic processes. For the experimental approach to this problem the discovery has been of great importance that early development of echinoids can be shifted in a vegetal or in an animal direction by exposure to certain chemical substances.

intolerance

Lecture 14,d to reproduce at will. The embryos are quite accessible in all developmental stages. Thanks to the yolk supply which every cell contains, embryonic parts are nutritionally independent until the differentiation of the larval organs is completed, in contrast to fish and reptile embryos, which draw th

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