Density gradient centrifugation is widely utilized for various high purity sample preparations, and density gradient ultracentrifugation (DGU) is often used for more resolution-demanding purification of organelles and protein complexes. Accurately locating different isopycnic layers and precisely extracting solutions from these layers play a critical role in achieving high-resolution DGU separa...

Density functional theory (DFT) is an incredible success story. The low computational cost, combined with useful (but not yet chemical) accuracy, has made DFT a standard technique in most branches of chemistry and materials science. Electronic structure problems in a dazzling variety of fields are currently being tackled. However, DFT has many limitations in its present form: too many approxima...

Watson and Crick (1953), and Kornberg (1967). The author assumes no prior knowledge. For example when discussing the observations of Meselson and Stahl not only does he include the usual symbolic illustrations of semiconservative DNA replication, but also a figure of equilibrium density gradient centrifugation. Each chapter ends with a summary of the observations presented which answer the orig...

BACKGROUND A predominance of small, dense LDL (sdLDL) confers in excess of a threefold increase in coronary heart disease (CHD) risk. The conventional method for the detection of sdLDL, salt density gradient ultracentrifugation (DGUC) has been superseded by more rapid techniques. This report presents novel methodology for the separation of sdLDL by a combination of iodixanol density gradient ce...

The ends of eukaryotic chromosomes contain specialized chromatin structures called telomeres, the length of which plays a key role in early human embryonic development. Although the effect of sperm preparation techniques on major sperm characteristics, such as concentration, motility and morphology have been previously documented, the possible status of telomere length and its relation with spe...

Two density gradient ultracentrifugation methods, Redgrave et al. (1975. Anal. Biochem. 65: 42-49) and Nilsson et al. (1981. Anal. Biochem. 110: 342-348), currently used for the separation and analysis of plasma lipoproteins were compared with respect to their resolving power and capacity to obtain pure products as a function of time of ultracentrifugation using the same rotor (Beckman SW-40), ...