Molecular cloning and transcriptional regulation of ompT , a ToxR-repressed gene in Vibrio cholerae

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72189/1/j.1365-2958.2000.01699.x.pd

DYNAMICAL CONCENTRATION FLUCTUATIONS IN LIQUID Li4Pb

A measurement of the quasielastic neutron scattering from liquid 7Li4Pb has been performed at a time of flight spectrometer (E0 = 4.1 meV, ƊE0 = 0.28 meV) for q(E=0) = 0.25... 2.5 A-1. Corrections for background, absorption, self shielding, and multiple scattering were applied and the spectra were reduced to cross sections by normalization to vanadium. Since the coherent scattering lengths average to zero, the intensity observed is essentially due to the concentration fluctuation structure factor Scc(q,E). Scc(q,E) shows a pronounced quasielastic peak around q ≈ 1.5 A-1. In the region of the peak, the energy width narrows down by about a factor of two (de Gennes narrowing). A fit in terms of a sum of Lorentzians is attempted which corresponds to an extrapolation of the description valid in the hydrodynamic limit. The self diffusion constant for Li is derived from the 7Li incoherent scattering and an interdiffusion constant from Scc(q,E)

THE SCATTERING LAW S (Q, ω) OF LIQUID ALUMINUM

No abstract availabl

NUCLEAR-NUCLEAR CORRELATIONS IN LIQUID RUBIDIUM

The neutron diffraction patterns of liquid rubidium have been measured for momentum transfers between 0.4-2.4 Å-1 for twelve states between 328-473 K and 10-1200 atmospheres using the IN4 spectrometer at the Institut Laue-Langevin. These states were chosen to give isothermal, isochoric and isobaric data. In this paper we present the experimental results and the isothermal pressure derivatives of the liquid structure factor. The latter may be predicted from a model in which the electron fluid is assumed to control the position of the ions, so that when it is compressed all inter-ion distances vary as (density)-1/3. The experimental derivatives are close to the predictions of the model, and some interpretations of this observation are given

Single and collective particle dynamics in liquid Rb-80(RbBr)(20)

International audienceThe temperature (T) dependence of the single and the collective particle dynamics of a melt containing 80 at% Rb and 20 at% RbBr was investigated using neutron inelastic scattering. Compared to pure liquid Rb, the dispersions obtained from the maxima of the longitudinal current correlation function clearly reflect the change of the atomic interaction from a metallic to a dominantly ionic regime. The T dependence of the atomic dynamics in Rb80(RbBr)20 is characterized by a broadening of the spectra resulting in a shift to higher energies in the dispersion and in the spectrum of the velocity auto-correlation function, which was determined here for a mixture of a liquid metal with a molten salt for the first time