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Full text  - 2nd International Conference of the
Full text - 2nd International Conference of the

... observations should earn a place for himself in the pantheon of distinguished plant scientists. Botany students learn about these connections, which have been found in all classes of plants and plant tissues, under the name given to them, ―plasmodesmata‖, by Strasburger in 1901.15 The full elucidati ...
The Evolution of Membranes - University of Guelph Physics
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DISCUSSION  The actin cytoskeleton mediates a variety of essential processes in... including cell motility, cell shape, phagocytosis, and cytokinesis. Three distinct...
DISCUSSION The actin cytoskeleton mediates a variety of essential processes in... including cell motility, cell shape, phagocytosis, and cytokinesis. Three distinct...

... DISCUSSION The actin cytoskeleton mediates a variety of essential processes in all eukaryotic cells, including cell motility, cell shape, phagocytosis, and cytokinesis. Three distinct kinds of actin-based structures have been identified, which are regulated by the Rho family of GTPases: Cdc42 induce ...
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... PAM matrices does not capture the difference between short and long time mutations. BLOck-SUbstitution-Matrices (1992) attempt to model long time mutations.  Idea: use aligned ungapped regions of protein families.These are assumed to have a common ancestor. Similar ideas but better statistics and m ...
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PDF
PDF

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Silence is green - Biochemical Society Transactions
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Electrochemical model for proton exchange membrane fuel cell
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... Beicha∗, ), [email protected] (Radia Zaamouche) ...
Pdf - MFPL
Pdf - MFPL

... this progresssion, specification occurs: This is the process by which cells in each region of the developing animal come to express a given set of genes. The spatial cues that trigger specification in development are generally signaling ligands produced by other cells, in consequence of their own pr ...
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Amitosis

Amitosis (a- + mitosis) is absence of mitosis, the usual form of cell division in the cells of eukaryotes. There are several senses in which eukaryotic cells can be amitotic. One refers to capability for non-mitotic division and the other refers to lack of capability for division. In one sense of the word, which is now mostly obsolete, amitosis is cell division in eukaryotic cells that happens without the usual features of mitosis as seen on microscopy, namely, without nuclear envelope breakdown and without formation of mitotic spindle and condensed chromosomes as far as microscopy can detect. However, most examples of cell division formerly thought to belong to this supposedly ""non-mitotic"" class, such as the division of unicellular eukaryotes, are today recognized as belonging to a class of mitosis called closed mitosis. A spectrum of mitotic activity can be categorized as open, semi-closed, and closed mitosis, depending on the fate of the nuclear envelope. An exception is the division of ciliate macronucleus, which is not mitotic, and the reference to this process as amitosis may be the only legitimate use of the ""non-mitotic division"" sense of the term today. In animals and plants which normally have open mitosis, the microscopic picture described in the 19th century as amitosis most likely corresponded to apoptosis, a process of programmed cell death associated with fragmentation of the nucleus and cytoplasm. Relatedly, even in the late 19th century cytologists mentioned that in larger life forms, amitosis is a ""forerunner of degeneration"".Another sense of amitotic refers to cells of certain tissues that are usually no longer capable of mitosis once the organism has matured into adulthood. In humans this is true of various muscle and nerve tissue types; if the existing ones are damaged, they cannot be replaced with new ones of equal capability. For example, cardiac muscle destroyed by heart attack and nerves destroyed by piercing trauma usually cannot regenerate. In contrast, skin cells are capable of mitosis throughout adulthood; old skin cells that die and slough off are replaced with new ones. Human liver tissue also has a sort of dormant regenerative ability; it is usually not needed or expressed but can be elicited if needed.
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