منابع مشابه
Genetic Drift in Populations of Ultraselfish Gene Complexes
We use stochastic population models to study the evolution of Ultraselfish Gene Complexes (USGC’s). USGC’s are chromosomal regions characterized by segregation distortion: a heterozygote bearing the USGC passes it to more than 50% of offspring. USGC-bearing homozygotes are sterile. USGC’s promote themselves at the expense of other genes in the same genome. They have been observed in animal, pla...
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In this review, we consider the exchange of nutrients between the host plant and the bacterial microsymbiont in nitrogen-fixing legume root nodules. During nodule formation, the host tissues and the bacterial microsymbiont develop in response to each other to form a specialized tissue that maintains an environment where nitrogen fixation can occur (Brewin, 2004; Mergaert et al., 2006; Prell and...
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Our intestine is the site of an extraordinarily complex and dynamic environmentally transmitted consortial symbiosis. The molecular foundations of beneficial symbiotic host-bacterial relationships in the gut are being revealed in part from studies of simplified models of this ecosystem, where germ-free mice are colonized with specified members of the microbial community, and in part from compar...
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S ymbiosis is the intimate “living together” of different organisms (1), and symbiotic relationships range from mutually beneficial to neutral or parasitic. Indeed, many microbial–host symbioses can vary between these states, depending upon circumstances. Recent years have seen an explosion of discoveries revealing novel microbial–host relationships and interactions. In addition to “classic” nu...
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Members of the phylum Chlamydiae are obligate intracellular bacteria that were discovered about a century ago. Although Chlamydiae are major pathogens of humans and animals, they were long recognized only as a phylogenetically well-separated, small group of closely related microorganisms. The diversity of chlamydiae, their host range, and their occurrence in the environment had been largely und...
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ژورنال
عنوان ژورنال: BioScience
سال: 2004
ISSN: 0006-3568
DOI: 10.1641/0006-3568(2004)054[0362:us]2.0.co;2