With gold challenging $750 and oil quite comfortable north of $80, this young autumn trading season has already proven exceedingly exciting and profitable for commodities investors. But for students of the markets, today s price levels in the metals and energy complex are certainly not surprising.
The Council for Higher Education Accreditation (CHEA) is a private, nonproï¬t national organization that coordinates accreditation activity in the United States. CHEA represents more than 3,000 colleges and universities and 60 national, regional and specialized accreditors.
Trichloroacetic acid (TCA) precipitation of proteins is commonly used to concentrate protein samples or remove contaminants, including salts and detergents, prior to downstream applications such as SDS-PAGE or 2D-gels.. Theory. TCA is an analog of acetic acid in which the three hydrogen atoms of the methyl carbon have been replaced with chlorine atoms. TCA is a relatively weak acid so it cannot hydrolyze the peptide bonds of proteins, but it does maintain an acidic pH in water.