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IV th Azospirillum Workshop
IV th Azospirillum Workshop

... Protón extrusión from roots of young wheat plants that were grown in the presence of ammonium and absence of ferrous ions was significantly enhanced after inoculation. This enhancement was more prominant in young inoculated plants than in older ones and may be associated with mineral uptake in the p ...
Reperfusion injury
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... Reperfusion injury It has been noted that many of the effects of ischemic injury seem to occur not only during the ischemic episode itself but also when perfusion (blood flow) is reestablished to an area of tissue that has been ischemic. The re-flowed blood encounters cells with already disrupted me ...
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... replicate themselves (not perfectly, but making mistakes (mutations) is important for life!) o Lipid membranes can form spontaneously (drop of oil on water) o Possibly, this is how life began. Oldest known fossils of cells on Earth are 3.465 billion years old! They are very similar to anaerobic phot ...
Groupwork on Flow of Matter
Groupwork on Flow of Matter

... Checklist for Explanatory Model of the Flow of Matter from Food Cells to Our Cells Scientists use explanatory models in order to be able to connect a series of ideas to explain how a natural phenomenon might work. Their explanation includes the available evidence and existing scientific knowledge up ...
Laboratory Exercise 20: Embryology and Fetology
Laboratory Exercise 20: Embryology and Fetology

... into the umbilical cord. Some of its cells migrate to the gonads to give rise to sex cells. The allantois derived from the endoderm. It will extend into the umbilical cord. The blood vessels of the allantois will serve as the umbilical arteries between mother and fetus. The allantois will serve in t ...
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Grade 7 Science-Unit 2: Formative Pre

... B. What is the effect of pH on the lifespan of tadpoles? C. Why do some people distrust genetically engineered crops? D. What is the best seed design for effective wind dispersal? 2. A student researching a new discovery about the activity of mitochondria could find the most current and reliable inf ...
the structures and functions of a Euglena. Draw a Euglena. B
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... Cell Organisation _______ are the building blocks of life. When we have a group of similar cells working together this is called a __________, for example muscle tissue is made up of lots of _________ cells. All the cells in a tissue look the same and perform the same job. A group of different tiss ...
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me239 mechanics of the cell 1.2 introduction to the cell 1.2

... membrane, they are responsible for inter- and intracellular transduction. together with myosin, they from the contraction apparatus to generate muscular contraction of skeletal and cardiac muscle. intermediate filaments are 8-12nm in diameter and thus more stable than actin filaments. they are also ...
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Cell Structure & Function
Cell Structure & Function

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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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