Read e-book online BarCharts QuickStudy Biology PDF

By Randy, Ph.D. Brooks

ISBN-10: 1572228261

ISBN-13: 9781572228269

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Cytosegresomes (acid phosphatase positive organelles, which contain sequestered cell organelles) are much more rare than the phagolysosomes, and distinction between them sometimes is difficult. Multivesicular bodies are rare. 36 Fig. 18. Mesonephros cat, 33rd day. Initial segment of the proximal tubule, apical cell region. Transport tubules (Tr) are found in addition to apical tubular invaginations (large arrow). They differ from the cisternae of the RER (which have only few ribosomes here) because of their slender shape and their increased electron density.

15). Thus, they cannot be classified as phagolysosomes from their ultrastructural appearance alone. For their proper identification, our own histochemical investigations (acid phosphatase) on cryostat sections and the ultrahistochemical studies of the kidney by other authors give some certainty. Cryostat sections clearly show that the amount and distribution of phagolysosomes is very similar in all segments of the proximal tubule. In the cytoplasmic protruSions, there is no activity of acid phosphatase.

Lm on the 39th day. The relative numer of mitochondria can be followed from Fig. 15, a comparison with other nephron segments results later from our histochemical investigations (succinic dehydrogenase). The ergastoplasm or rough surfaced endoplasmic reticulum (RER) closely follows the lateral plasmalemma in the intermediary cell region with advancing maturation, so that these faces are frequently flanked by long RER cisternae on both sides. After the 33rd day, RER cisternae also flank deep infoldings of the basal plasmalemma.

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BarCharts QuickStudy Biology by Randy, Ph.D. Brooks

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