منابع مشابه
Seeking the ultimate and proximate causes of volvox multicellularity and cellular differentiation.
Volvox and its relatives provide an exceptional model for integrative studies of the evolution of multicellularity and cellular differentiation. The volvocine algae range in complexity from unicellular Chlamydomonas through several colonial genera with a single cell type, to multicellular Volvox with its germ-soma division of labor. Within the monophyletic family Volvocaceae, several species of...
متن کاملVolvox
What is Volvox? The name comes from the Latin volvere, to roll, and ox, as in atrox, fierce. Volvox is a spherical multicellular green alga, which contains many small biflagellate somatic cells and a few large, non-motile reproductive cells called gonidia, and swims with a characteristic rolling motion. Ever since van Leeuwenhoek first viewed these algal ‘fierce rollers’ with utter fascination ...
متن کاملControl of differentiation in volvox carteri: a model explaining pattern formation during embryogenesis.
The green flagellate J’olvox is a simple muhicellular organism having only two kinds of cells, somatic and reproductive. The cells are arranged on the periphery of a spheroid. Asexual individu~s of I’olvox carten’ are composed of 2000-4000 somatic cells and about 16 large reproductive cells (gonidia), located in the posterior region of the spheroid. Mature asexual spheroids show a very regular ...
متن کاملCellular Differentiation in the Thymus
Young adult rat thymus and lymph node cell subpopulations were obtained by differential flotation on discontinuous BSA density gradients and assayed for properties characteristic of mature thymus-derived lymphocytes. One such subpopulation (C) of thymocytes was enriched in its ability to respond mitotically to a hemiallogeneic MLR stimulus, to localize in the parenchyma of lymph nodes and splee...
متن کاملDifferentiation in Volvox carteri: Study of Pattern Variation of Reproductive Cells
Volvox carteri, Differentiation, Embryogenesis, Cell Lineages, Pattern Formation Asexual spheroids of the multicellular green alga Volvox are composed of two types of cells: non-flagellated reproductive gonidia and Chlamydomonas-\ike flagellated somatic cells. They are committed by a differentiating cleavage during embryogenesis. The gonidia of the adult spheroids form a symmetrical pattern con...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1968
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.59.4.1082