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Isolation of N-Acetylmuramoyl-L-Alanine Amidase Gene (amiB) from
Isolation of N-Acetylmuramoyl-L-Alanine Amidase Gene (amiB) from

... and L-amino acids in bacterial cell walls. As shown in Fig. 6A, the Ami domain of the N-terminus is very similar to those of V. cholerae, V. fischeri, V. parahaemolyticus, and V. vulnificus: The identities were 90%, 80%, 75%, and 73%, respectively. Three repeated LysM motifs of the Cterminus found i ...
Primordial germ cells migration: morphological and molecular aspects
Primordial germ cells migration: morphological and molecular aspects

... development and migrate by a well-defined route into the genital ridges (Witschi, 1948; Chiqouine, 1954). Since PGCs present high alkaline phosphatase activity, this activity has been used as a marker through which they have been identified in an extra-embryonic region near the yolk sac early in emb ...
PDF
PDF

... expressed at higher levels in XY than in XX gonads throughout these stages (see Fig. S1 in the supplementary material). Using both methods, Notch2 was detected at low levels at 11.5 dpc (Fig. 1A,M,P). lacZ-positive cells (detected using an antibody against β-gal) were found in the coelomic epitheliu ...
IMPACT SAMR Cover Sheet
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... notes from a power point presentation on the cell. Use technology when appropriate to enhance laboratory investigations and presentations of findings. (SI-H-A3) ...
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... After completing this activity, students will: Cancer as a Multistep Process ...
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... at which D N A synthesis begins is also demonstrated by the change in the utilization of H 3thymidine of the medium for macronuclear D N A synthesis. Amino acid deprivation before D N A synthesis begins prevents the subsequent uptake of H3-thymidine into macronuclear D N A although macronuclear D N ...
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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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