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Microbial Primer: Phase variation - survival and adaptability by generation of a diverse population [PDF]
Microbiology (United Kingdom)John Atack
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Phase variation and antigenic variation
2005A review on the best understood mechanisms of phenotypic diversification by phase variation and antigenic variation, and their functions. Topics discussed include DNA inversion, gene conversion, phase variation by slipped-strand mispairing, phase variation by an epigenetic mechanism, influence of environmental conditions on phase variation, and phase ...
Villemur, Richard, Déziel, Éric
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Phase variation in Bartonella henselae
Microbiology, 2003Bartonella henselae is a fastidious, Gram-negative bacterial pathogen of cats and humans. Previous workers have shown that serial passage in vitro leads to attenuation of virulence-associated attributes such as expression of pili, invasion of human epithelial cell lines and the stimulation of endothelial cell proliferation. In contrast to the published
Pierre, Kyme +2 more
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Hypervariation and phase variation in the bacteriophage ‘resistome’
Current Opinion in Microbiology, 2007Most bacteria encode proteins for defence against infection by bacteriophages. The mechanisms that bring about phage defence are extremely diverse, suggesting frequent independent evolution of novel processes. Phage defence determinants are often plasmid or phage-encoded and many that are chromosomal show evidence of lateral transfer. Recent studies on
Hoskisson, P., Smith, M.C.M.
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Fimbrial phase variation: stochastic or cooperative?
Current Genetics, 2015Surface fimbriae of pathogenic Escherichia coli facilitate sensing, adhesion and even invasion of host epithelial cells. While it is known that the pathogen has the potential to express a plethora of fimbrial variants susceptible to rapid phase ON/OFF variation, it is an open question if the fimbrial diversity seen at the population level is the ...
Khandige, Surabhi +1 more
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A Variational Principle for Scattering Phases
Proceedings of the Physical Society, 1960A first-order variational principle for a stationary scattering phase is obtained by keeping constant the energy normalization for permitted variations of the wave function. The principle is used to derive (i) a variational correction to the phase obtained from given approximate wave functions, (ii) a first-order perturbation theory, (iii) a first Born
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Phase Variation: Evolution of a Controlling Element
Science, 1980Phase variation in bacteria is regulated by homologous recombination at a specific DNA site. This recombinational event causes the inversion of a 970-base-pair DNA sequence that includes the promoter necessary for transcription of a flagellar gene.
M, Simon +4 more
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Variations of the phase-only filter
Conference Proceedings., IEEE International Conference on Systems, Man and Cybernetics, 2003Summary form only given, as follows. An alternative to the classical method filter, namely the phase-only filter, is shown to be useful for pattern recognition and image correlation. It exhibits extremely narrow correlation peaks with very small sidelobes, better discrimination between similar objects, and 100% throughput when implemented optically ...
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Variational Bayes for Phase-Type Distribution
Communications in Statistics - Simulation and Computation, 2014This article develops an algorithm for estimating parameters of general phase-type (PH) distribution based on Bayes estimation. The idea of Bayes estimation is to regard parameters as random variables, and the posterior distribution of parameters which is updated by the likelihood function provides estimators of parameters.
Hiroyuki Okamura +2 more
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Phase variation of lipopolysaccharide in Haemophilus influenzae
Research in Microbiology, 1991Lipopolysaccharide (LPS) structures on Haemophilus influenzae, defined by monoclonal antibodies, can show phase variation from generation to generation. Several genetic loci are involved in LPS biosynthesis by H. influenzae. In this paper, we describe three loci which play a role in LPS phase variation: the lic loci; lic1 and lic3 have been sequenced ...
D J, Maskell +4 more
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