منابع مشابه
Epigenetic switch turns on genetic behavioral variations.
What roles do environmental factors, genes, and heredity play in shaping the behaviors of individuals? In his 1963 article entitled “Behavior genetics and individuality understood,” the pioneering behavioral geneticist Jerry Hirsch (1) eloquently articulated that “Individual differences are no accident. They are generated by properties of organisms as fundamental to behavioral science and biolo...
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UNLABELLED Bacteria are extremely versatile organisms that rapidly adapt to changing environments. When bacterial cells switch from planktonic growth to biofilm, flagellum formation is turned off and the production of fimbriae and extracellular polysaccharides is switched on. BolA is present in most Gram-negative bacteria, and homologues can be found from proteobacteria to eukaryotes. Here, we ...
متن کاملThe Rrop GTPase switch turns on polar growth in pollen.
Pollen-tube growth not only represents an essential stage of plant reproduction but also provides an attractive model for studying cell polarity and morphogenesis. For many years, pollen-tube growth has been known to require a tip-focused Ca2+ gradient and dynamic F actin, but the way that these are controlled remained a mystery until recently. Rop appears to be activated at growth sites by a t...
متن کاملDifferentiation of Mouse Embryonic Stem Cells into Hematopoietic Cells
Purpose: Differentiation of Mouse embryonicstem cells into Hematopoietic cells. Materials and Methods: In this study, we used EB formation system for Hematopoietic differentiation of mouse embryonic stem cell (Royan B1) in suspension culture. EBs cultured in medium with Hematopoietic inducer cytokines (SCF, TPO, GMCSF, IL3, Flt3 and EPO) .presence of hematopoietic differentiated cell assessed ...
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background new research proposes the pluripotency of spermatogonial cells obtained from testis. these spermatogonia-derived stem cells are called embryonic stem-like cells that express embryonic stem cell markers and differentiate to the three germ layers. objectives the aim of the present study was to generate embryonic stem-like cells from neonatal mouse testis. materials and methods the test...
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ژورنال
عنوان ژورنال: Nature
سال: 2007
ISSN: 0028-0836,1476-4687
DOI: 10.1038/447618a