OBJECTIVE The purpose of the present research was to compare the residual microbial load in Solo System microfiber mops with silver and in normal microfiber mops without silver to see whether those with the silver prevent bacterial proliferation and spread more effectively during normal cleaning operations. METHODS Mops with and without silver were experimentally contaminated with suspension ...

Two unique metabolites of cocaine, cocaethylene and norcocaine, were identified by GC/MS in the hair of cocaine users. Their presence cannot be explained by environmental contamination; thus, their presence together with cocaine provides convincing evidence that cocaine is excreted in hair after active cocaine administration. The amount of cocaine in hair predominated over all metabolites gener...

A simple method for the determination of tryptophan residues in proteins is described. The method involves (a) treatment of the protein with an excess of 2-hydroxy-Snitrobenzyl bromide, (b) purification of the labeled protein by gel filtration and ethanol washing, (c) measurement of the absorbance at 410 rnp to determine the number of colored groups incorporated, and (d) a determination of the ...

Mere familiarity does not necessarily produce understanding. It is perfectly possible to know something (or someone!) all your life and still never really comprehend what you're dealing with. Like the Irishman in the old joke who received a brand-new toilet from his American cousins: He used the bowl for a foot washer, the lid for a breadboard, and the seat for a frame around the Pope's picture.

The isolation of cancer epithelial cells from mouse mammary tumor is accomplished by digestion of the solid tumor. Red blood cells and other contaminates are removed using several washing techniques such that primary epithelial cells can further enriched. This procedure yields primary tumor cells that can be used for in vitro tissue culture, fluorescence-activated cell sorting (FACS) and a wide...

A simple method for the determination of tryptophan residues in proteins is described. The method involves (a) treatment of the protein with an excess of 2-hydroxy-Snitrobenzyl bromide, (b) purification of the labeled protein by gel filtration and ethanol washing, (c) measurement of the absorbance at 410 rnp to determine the number of colored groups incorporated, and (d) a determination of the ...