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Cellular differentiation is the process in which a stem cell changes from one type to a differentiated one. [2] [3] Usually, the cell changes to a more specialized type. Differentiation happens multiple times during the development of a multicellular organism as it changes from a simple zygote to a complex system of tissues and cell types.
Cell fusion is an important cellular process in which several uninucleate cells (cells with a single nucleus) combine to form a multinucleate cell, known as a syncytium.Cell fusion occurs during differentiation of myoblasts, osteoclasts and trophoblasts, during embryogenesis, and morphogenesis. [1]
During the impact, there is an exchange of pre-existing cores containing metallic material. [3] The planetary differentiation event is said to have most likely happened after the accretion process of either the asteroid or a planetary body. Terrestrial bodies and iron meteorites consist of Fe-Ni alloys. [4] The Earth's core is primarily ...
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus .
As this happens, the resulting cells will organize so that one end becomes the first root, while the other end forms the tip of the shoot. In seed plants, the embryo will develop one or more "seed leaves" . By the end of embryogenesis, the young plant will have all the parts necessary to begin its life.
Epigenetics is known to be important in the regulation of gene expression of differentiation. As such, studies done on small molecules or drugs that inhibit epigenetic mechanisms during differentiation can have great potential for clinical applications such as bone regeneration from mesenchymal stem cells. [15]
During skeletal myogenesis, cycling progenitor cells known as myoblasts differentiate and fuse together into non-cycling muscle cells called myocytes that remain in a terminal G 0 phase. [17] As a result, the fibers that make up skeletal muscle (myofibers) are cells with multiple nuclei, referred to as myonuclei, since each myonucleus ...
Other major changes during gastrulation: Heavy RNA transcription using embryonic genes; up to this point the RNAs used were maternal (stored in the unfertilized egg). Cells start major differentiation processes, losing their totipotentiality. In most animals, a blastopore is formed at the point where cells are migrating inward.