New PDF release: A Glossary of Genetics and Cytogenetics: Classical and

By Rigomar Rieger

ISBN-10: 3662010127

ISBN-13: 9783662010129

ISBN-10: 3662010143

ISBN-13: 9783662010143

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Additional resources for A Glossary of Genetics and Cytogenetics: Classical and Molecular

Example text

The first "organism" is called an eobiont (-+ eobiogenesis; neobiogenesis). B. can be divided arbitrarily into two phases (Keosian I965): a) the phase that covers the period of physical and chemical processes in the abiotic synthesis of macromolecular systems; biosome b) the phase (eobiogenesis) that includes the transformation of macromolecular systems into the first living things. biosome (Lehmann 1947) - any autonomous cell constituent multiplying or presumed to multiply by autoreduplication.

If the karyotype has changed, but the diploid number of chromosomes remains the same, such cells may be referred to as "pseudodiploid". A heteroploid c. l. is one having less than 75% of cells with diploid chromosome constitution (FeodoroO 19 67). cell lineage (Wilson 1882) - the derivation of a tissue or part of tissue from a definite -'>- blastomere of the embryo. 45 cell membrane cell membrane (NiigeZi & Cramer 1855) - any structure which forms boundary layers between two cellular compartments (-+ plasma membrane).

Bacteriocins produced by Escherichia coli are called -'>- colicins, those of Pseudomonas aeruginosa, pyocins; Pasteurella pestis produces pesticins. The active bactericidal components of bacteriocins are proteins. The mechanism of killing action differs from one b. to another. All activities of bacteriocins are exerted by b. molecules attached externally to the bacterial surface at specific receptors on the bacterial cell wall. Phage receptors and b. receptors are often the same and a mutation can render a bacterium resistant to a phage and one or more bacteriocins.

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A Glossary of Genetics and Cytogenetics: Classical and Molecular by Rigomar Rieger

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