By Hans-Dieter Görtz (auth.), Prof. Dr. Hans-Dieter Görtz (eds.)
ISBN-10: 3642730868
ISBN-13: 9783642730863
ISBN-10: 3642730884
ISBN-13: 9783642730887
Why a booklet on Paramecium? Biologists often focus their efforts on a unmarried challenge and a unmarried organism. there's a hassle with this tradition, even if, for as paintings on an issue proceeds it frequently turns into extra advert vantageous to review the matter in one other organism. a few biologists keep away from the trouble via relocating from one organism to the opposite because the challenge de mands. despite the fact that, this tactic additionally has an obstacle, for a radical wisdom of the lifestyles cycle and thorough mastery of how to address a given organism within the laboratory are patently of significant value to the researcher, and it is easy to by no means comprehend numerous organisms in addition to you may comprehend a unmarried one. otherwise of doing examine is to choose the organism, research all possible approximately it from all issues of view, after which check the importance of the findings. Tracy Sonneborn practiced examine in a great deal this fashion. He could have came across almost each bankruptcy during this quantity approximately Paramecium a desirable precis of 1 of his parts of study. certainly, the beginnings of many of the themes during this e-book are based on his experiences. With each new truth he realized approximately Paramecium, he conscientiously assessed the importance of his findings, now not on ly for examine on protozoa, yet for biology generally. His paintings, and in a fashion this booklet too, are indicative of the luck of his strategy.
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Additional resources for Paramecium
Example text
2 Storage Bodies and Crystals Paramecium from time to time contains at least three types of storage materials (glycogen, lipid, and crystals) whose presence or absence depend on the nutritional condition of the cell. Glycogen (Fig. 21) is stored as small electronopaque beta particles scattered throughout the cytoplasm (Esteve 1969). This product is frequently dissolved during the fixation and dehydration steps used for electron microscopy. In well-fed and axenically grown cells lipid (Fig. 23) is accumulated and stored as nonmembrane-bounded droplets of about 1 ~m in diameter (Fok and Allen 1979, 1981).
During division the macronucleus undergoes a sequence of positional and shape changes. It first moves to the dorsal surface and elongates into an oval shape as a marginal band of nucleoplasmic microtubules is formed. It then changes into an elongated sausage shape as the marginal band disassembles and intranuclear microtubules assemble (Tucker et al. 1980). Nucleoli sometimes attach to the microtubular framework. Though discrete chromosomes are not observed, a fairly equitable segregation of chromatin material to the daughter macronuclei results (Tucker et al.
Basal bodies develop next to the anterior proximal surface of preexisting basal bodies (DippeIl1968). The proximal end of the basal body is formed first and its axis is oriented perpendicular to the mature basal body. This is then followed by an elongation of the peripheral triplets and tilting of the body toward the cell surface. In Paramecium several nascent basal bodies can be found in a row anterior to a mature basal body in the cell's equatorial region. The basal bodies will move apart along the kinety and accessory structures will form and insert into the preexisting cortical patterns as they take up their final positions.
Paramecium by Hans-Dieter Görtz (auth.), Prof. Dr. Hans-Dieter Görtz (eds.)
by Ronald
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