Results 321 to 330 of about 8,119,390 (363)

On the Nature of Competence of Transformable Streptococci

Journal of General Microbiology, 1963
SUMMARY Transformable streptococci produce an exocellular factor provoking competence under certain conditions. Non-competent cultures become competent upon addition of this factor. The kinetics of conversion is concomitant with an enzymic reaction; the process is time and temperature dependent and the factor itself is heat sensitive. The action of the
R. Pakula, W. Walczak
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Nature and its Transformations

Theological Studies, 1972
EVERY VIEW of nature connotes a view of the human subject as knower I and moral agent, and it is my purpose to explore the implications of this fact. The subjectivity implied by an objective claim cannot, however, be studied by making it the object of some form of direct inquiry like introspection, in which data are collected, analyzed, and finally ...
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On the nature of the omega transformation

Acta Metallurgica, 1973
Abstract The symmetry change associated with the b.c.c. to omega transformation is examined using the Landau criterion for a second order reaction. The ordering parameter η is defined in terms of the transformation displacements such that the structure denned by +η is omega. The structure given by −η, however, is not omega.
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Natural Transformation in Escherichia coli

2019
Escherichia coli is well known for its ability to undergo artificial transformation. This bacterium is not generally recognized as naturally transformable. However, several past studies have demonstrated that laboratory and natural strains of E. coli can express modest natural competence under feasible environmental conditions.
Yoko Komiyama, Sumio Maeda
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RpoS is required for natural transformation of Vibrio cholerae through regulation of chitinases.

Environmental Microbiology, 2016
Vibrio species naturally reside in the aquatic environment and a major metabolite in this habitat is the chitinous exoskeletons of crustacean zooplankton.
A. Dalia
semanticscholar   +1 more source

Natural transformation in river epilithon

Applied and Environmental Microbiology, 1996
Natural transformation was demonstrated in unenclosed experiments incubated in river epilithon. Strains of Acinetobacter calcoaceticus were transformed to prototrophy by either free DNA (lysates) or live donor cells. The sources of transforming DNA and recipient culture were immobilized on filters, secured to stones, and incubated midstream in the ...
G J Stewart, H. G. Williams, John C. Fry, M.J. Day   +3 more
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Natural Transformation of Oral Streptococci

2010
Natural transformation is found in most groups of oral streptococci, including the mitis, the anginosus, and the mutans groups. This ability has been applied as a powerful tool to explore streptococcal gene functions and regulatory pathways, particularly in Streptococcus mutans and Streptococcus gordonii.
Anne Aamdal Scheie, Fernanda Cristina Petersen   +1 more
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On the nature of the martensitic transformation

Metallurgical Transactions A, 1975
A novel conceptual approach to martensitic transformation is presented. The current concepts are discussed briefly, and a more general qualitative approach to this type of phase change is proposed. It is suggested that the transformation originates in lattice vibration modes, and that once initiated it proceeds adiabatically with no discernible ...
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The nature of martensitic transformations

JOM, 1959
The true nature of the martensite transformation was determined only in recent years. Presented here is a review of this work, given originally at the Second World Metallurgical Congress, by the noted Soviet Acamedician who is credited with this significant discovery.
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The Hough Transform and Its Nature

1990
This chapter discusses the nature of the Hough transform (HT). It develops the generalized Hough transform (GHT), which can be used to find all shapes, and shows how it is related to the spatial matched filter, hence leading to optimal detection sensitivity. This means that gradient rather than uniform weighting should be used in parameter space. As an
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