Описание: This teachers guide is structured around 10 fundamental questions about biological evolution. The teachers guide explores the DVD`s commentary from some of the world`s most well-known biologists, who gathered on the Galapagos Islands during a World Summit on Evolution and were interviewed about everything from what evolution is to how it happens to why anyone should care.
Автор: H.L. Robinson; R. Lathe; W.L. Staudenbauer Название: Current Topics in Microbiology and Immunology ISBN: 364267089X ISBN-13(EAN): 9783642670893 Издательство: Springer Рейтинг: Цена: 18167.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: Bacterial plasmids are circular double-stranded DNA molecules that are physi- cally separate from the bacterial chromosome. They are replicated and stably inherited in the extrachromosomal (autonomous) state. The plasmids of entero- bacteria can be divided into two distinct groups according to their size: (i) small plasmids with MW of less than 10 Mdal, and (ii) large plasmids with MW ranging from 50-100 Mdal. These two groups differ strikingly in their copy numbers per cell (multiplicity). Whereas most small plasmids are multicopy plasmids (20-100 copies per cell), large plasmids are normally present at a multiplicity similar to the number of chromosomal genome equivalents (oligo- copy plasmids). Furthermore, large plasmids can promote the transfer of DNA by conjugation and are therefore classified as conjugative plasmids. Since this property depends on the presence of the tra operon, a 15-20 Mdal segment of DNA (Helmuth and Achtman, 1975), small plasmids are necessarily nonconju- gative. Because of their inability to mediate DNA transfer, small plasmids have often been designated as "nontransmissible. " This is clearly a misnomer since nonconjugative plasmids can in general be mobilized for conjugal transfer by a conjugative plasmid present in the same cell. Plasmids can further be classified with respect to their ability to continue replication in the absence of de novo protein synthesis (stable replication).
Автор: W. Arber; W. Henle; P. H. Hofschneider; J. H. Hump Название: Current Topics in Microbiology and Immunology ISBN: 3642668550 ISBN-13(EAN): 9783642668555 Издательство: Springer Рейтинг: Цена: 18167.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: Yosemite is one of the most visited national parks, with scenery that is world-renowned. Photographer Harold Davis has explored Yosemite for years with his camera, finding the best vantage points and most photogenic times of year. Postcards in this book show Yosemite in winter, Vernal and Nevada Falls, Mirror Lake, Yosemite Valley, the view from Inspiration Point, and more
Описание: Although separation techniques have been used in a variety of cellular systems, they have been particularly useful in the study of reticuloendothelial cells and primarily in the study of cells partici- pating in the immune responses.
Автор: W. Arber; W. Braun; R. Haas; W. Henle; P. H. Hofsc Название: Current Topics in Microbiology and Immunology ISBN: 3642654460 ISBN-13(EAN): 9783642654466 Издательство: Springer Рейтинг: Цена: 18167.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: Two kinds of antigenic variation occur in influenza viruses, antigenic drift and major antigenic shifts; Antigenic drift, which involves gradual changes in the surface antigens of influenza virus, is thought to result from the selection by an immune popula- tion of mutant virus particles with altered antigenic determinants.
Описание: Each control operation is mediated by a pair of complementary genetic elements (hereafter called "control cell"): a control gene which produces a l control (or regulator) protein and a control site which is the target for the regulator protein. Negative control means that the control protein (repressor) prevents gene expression.
Описание: The Herpesviruses A consideration of the genetic analysis of members of the herpesvirus group necessitates a description, albeit brief, of the properties of the group and, most importantly, of their genetic material.
Автор: W. Arber; R. Haas; W. Henle; P. H. Hofschneider; J Название: Current Topics in Microbiology and Immunology ISBN: 3642658504 ISBN-13(EAN): 9783642658501 Издательство: Springer Рейтинг: Цена: 18167.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Автор: W. Arber; S. Falkow; W. Henle; P. H. Hofschneider; Название: Current Topics in Microbiology and Immunology ISBN: 3642673244 ISBN-13(EAN): 9783642673245 Издательство: Springer Рейтинг: Цена: 18167.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: The difference in agglutinin titre between High and Low lines is 220-fold in Selection I, 103-fold in Selection II, 90-fold in Selection III, 85-fold in Selection IV and 275-fold in Selection V.
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