The chemotactic behavior of Escherichia coli mutants defective in cheB function, which is required to remove methyl esters from methyl-accepting chemotaxis proteins, was investigated by subjecting swimming or antibody-tethered cells to various attractant chemicals. Two cheB point mutants, one missense and one nonsense, exhibited stimulus response times much longer than did the wild type, but th...

A growing literature indicates that people are increasingly motivated to experience a sense of meaning in their work lives. Little is known, however, about how perceptions of work meaningfulness influence job choice decisions. Although much of the research on job choice has focused on the importance of financial compensation, the subjective meanings attached to a job should also play a role. Th...

Rare hematopoietic stem cell populations are responsible for the transplantation engraftment process. Umbilical cord blood (UCB) is usually processed to total nucleated (TNC), but not mononuclear (MNC) fraction. TNC counts used determine UCB unit storage, release and correlation with time [1]. It has been mentioned in literature that there several factors affect harvesting of cells [2]. was set...