True amplitude migration is a di raction stack with a properly chosen weight function in its migration kernel. Many papers claim that with a carefully chosen weight function, di raction stack migration will yield an image with its amplitudes proportional to the angular-dependent re ection coe cients at the re ector positions. Bleistein used the stationary phase method to give a proof of this cl...

In a newly introduced time scale τ , much smaller than the usual t, any object is assumed to be a point-like particle, having a definite position. It fluctuates without dynamics and the wave function Ψ is defined by averaging the square root of the density. In t-scale, the Schrödinger equation holds and for a macrovariable just a classical path is picked up as a peak of Ψ by the stationary phas...

A recent study indicates that the genomic mutation rate of the gut bacterium Escherichia coli is substantially higher in nongrowing than growing cultures. These findings are important in the light of the ongoing controversy over the generality and robustness of stationary phase mutagenesis and its evolutionary implications.

For determination of selected carotenoids, various types of columns for high-performance liquid chromatography (HPLC) with different properties have been used. The characteristics of the laboratory-used packing material containing monomeric alkyl-bonded phases (C18, C30) and phenyl as well as phenyl-hexyl stationary phases were studied. The retention data of the examined compounds were used to ...

Growth and proliferation of microorganisms such as the yeast Saccharomyces cerevisiae are controlled in part by the availability of nutrients. When proliferating yeast cells exhaust available nutrients, they enter a stationary phase characterized by cell cycle arrest and specific physiological, biochemical, and morphological changes. These changes include thickening of the cell wall, accumulati...

We found that Escherichia coli grown in media with >37 mM phosphate maintained a high polyphosphate level in late stationary phase, which could account for changes in gene expression and enzyme activities that enhance stationary-phase fitness.

The Metropolis-Adjusted Langevin Algorithm (MALA) is a Markov Chain Monte Carlo method which creates a Markov chain reversible with respect to a given target distribution, π , with Lebesgue density on R ; it can hence be used to approximately sample the target distribution. When the dimension N is large a key question is to determine the computational cost of the algorithm as a function of N . ...

We have characterized the induction kinetics of approximately 1,700 proteins during entry into and survival in carbon-starved stationary phase by Mycobacterium smegmatis. Strikingly, among the patterns of expression observed were a group of proteins that were expressed in exponential-phase cultures and severely repressed in 48-h stationary-phase cultures (Spr or stationary-phase-repressed prote...

Expression of the catalase-peroxidase of Caulobacter crescentus, a gram-negative member of the alpha subdivision of the Proteobacteria, is 50-fold higher in stationary-phase cultures than in exponential cultures. To identify regulators of the starvation response, Tn5 insertion mutants were isolated with reduced expression of a katG::lacZ fusion on glucose starvation. One insertion interrupted a...

This review centers on the stationary phase of bacterial culture. The basic processes specific to the stationary phase, as well as the regulatory mechanisms that allow the bacteria to survive in conditions of stress, are described.