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18. plant growth - Development of e
18. plant growth - Development of e

... Growth is defined as a vital process that brings about a permanent and irreversible change in any plant or its part in respect to its size, form, weight and volume. Growth is restricted only to living cells and is accomplished by metabolic processes involving synthesize of macromolecules, such as nu ...
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Edwin Barangan

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Chapter10 Pteridophyta
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Cell Cycle - University of Bath
Cell Cycle - University of Bath

... checkpoints was provided by the observation of delayed entry into S phase or mitosis following exposure to radiation or carcinogens. Editing functions and decisions for continued proliferation, growth arrest or apoptotic cell death occur at these regulatory junctures (Figure 3). The complexity of th ...
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The Endosymbiotic Relationship of Leguminosae (Fabaceae) and

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Advanced Live Cell Microscopy at the W. M. Keck Center for Cellular
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... in such clones. Interestingly, the type of ~53 mutants generated by these selections in vitro are similar to those observed in tumors in vivo (Mowat et al., 1985; Eliyahu et al., 1988). In contrast, if primary rat cells were transfected with ras plus ElA plus p53-mutant (va& or KH215), an increased ...
Membrane Proteins - Hillsborough Community College
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... Mount Royal College ...
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... with cytochalasins and microtubule polymerization and depolymerization inhibitors permitted the non-pathogen Erysiphe pisi to penetrate barley coleoptile cells and form haustoria and secondary hyphae (Kobayashi et al., 1997a). These results indicated that the cytoskeleton may play an important role ...
Biology 2121 Review – Cell Structure and Function (Chapter 3
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Role of Polycomb Group Protein Cbx2/M33 in Meiosis Onset and

... In all sexually reproducing organisms, germ cells have the monumental task of transmitting genetic information through subsequent generations. Primordial germ cells (PGCs) must undergo epigenetic reprogramming, meiotic recombination and two subsequent chromosomal divisions in order to give rise to m ...
Human Mesenchymal Stem Cells Modulate Cellular Immune
Human Mesenchymal Stem Cells Modulate Cellular Immune

... von Willebrand Factor, and kinase domain receptor). All cell preparations at different passages of culture expressed the typical MSC markers: CD105, CD73, CD44, CD90, CD166 and CD146. They also expressed human leukocyte antigen (HLA) class I but not class II, both at baseline and after stimulation w ...
ARVO 2017 Annual Meeting Abstracts 306 Lens Physiology and
ARVO 2017 Annual Meeting Abstracts 306 Lens Physiology and

... the positive cells were quantified with fluorescence microcopy. Results: Cx50 hemichannels were open in response to the treatment with H2O2. The dye uptake assay showed that chick embryonic fibroblast (CEF) cells or lentoids bodies in lens primary culture were highly sensitive to H2O2, and hemichann ...
PDF
PDF

... of the mouse (Diwan & Stevens, 1976), thus indicating that the mechanism of definitive germ layer formation might be the same in both species. Moreover, this principle of gastrulation (origin of all three definitive embryonic germ layers from the primary ectoderm) seems to be even more general, for ...
Unlinked Noncomplementation: Isolation of New Conditional-Lethal Mutations in Each of the Tubulin Genes of Saccharomyces cerevisiae .
Unlinked Noncomplementation: Isolation of New Conditional-Lethal Mutations in Each of the Tubulin Genes of Saccharomyces cerevisiae .

... NEFFand BOTSTEIN1985) and by mutaTHOMAS and genesis of the cloned gene (HUFFAKER, BOTSTEIN1988). The two a-tubulin genes, TUBl and TUB3, have been isolated, sequenced, and analyzed genetically (SCHATZ,SOLOMON and BOTSTEIN1986; SCHATZet al. 1986). TUBl and TUB3 show 10% divergence attheamino acid lev ...
Unusual Prokaryotic Envelope Cyanobacterial Cell Walls
Unusual Prokaryotic Envelope Cyanobacterial Cell Walls

... accelerated with the availability of the first completely sequenced cyanobacterial genome (87). Using the sequence of Synechocystis sp. strain PCC 6803, it could be shown that plant phytochromes might have evolved from phytochrome-like molecules in cyanobacteria (131; J. Hughes, T. Lamparter, F. Mit ...
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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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