However, at zero Mach number, the flow is frozen and entropy spots are not convected downstream: they produce a singularity at the flame front due to the mean density gradient, which acts as an additional source term in the mass conservation equation.
The acoustic field is predicted very accurately as long as enough segmentation points are used and the condition for the linear mean temperature profile is satisfied: |k0|>|α|, where k0 is the local wave number when there is no mean flow and α is the normalised mean density gradient.
By means of density gradient centrifugation the 70S ribosome was divided into its two subunits, the small ribosomal subunit 30S and the large ribosomal subunit 50S.
To determine if vezatin is a cytoplasmic or a plasma membrane protein (either integral or membrane-associated), we carried out whole-cell protein extraction with or without Triton X-100, and a subcellular fractionation experiment by means of density gradient centrifugation.
The correlation coefficients of yearly mean values of radial density gradient and parallel mean-free-path with the sunspot number were respectively 0.7 and 0.6.
UCB mononuclear cells were isolated by means of Ficoll density gradient centrifugation (specific gravity, 1.077; Amersham Biosciences, Uppsala, Sweden).
A volume of 30 ml of peripheral blood was obtained pre- and post- (3rd, 6th, and 9th) vaccination, and PBMCs were isolated by means of Ficoll Conray density gradient centrifugation, as reported previously (Miyagi et al, 2001).
PBMCs were isolated from 20 ml of heparinized blood of HLA A24+ (n=55) and HLA A2+ (n=25) cancer patients (40 gastric, 15 colon, 11 lung, seven gynaecological, three prostate cancers, and four melanomas) by means of Ficoll Conray density gradient centrifugation as reported previously (Gomi et al, 1999).
We show the derived density gradient and mean free path varying with the solar activity and magnetic cycles.
Following the analyses by Chen and Bieber (1993), we derive modulation parameters, i.e., the density gradient and the mean free path of the pitch angle scattering.
The density gradient in the borehole is a result of the heat transfer rate and the mean temperature level in the borehole water.
