A general term for any factor that increases a personâs mental or physical stress; virtually all stressors can be described as related to environment (e.g., inadequate housing) or personal (e.g., health related, sexual, social or related to work).
Bovine serum albumin (also known as BSA or Fraction V) is a serum albumin protein derived from cows.It is often used as a protein concentration standard in lab experiments.t is also used as a nutrient in cell and microbial culture. In restriction digests, BSA is used to stabilize some enzymes during digestion of DNA and to prevent adhesion of the enzyme to reaction tubes, pipet tips, and other vessels.
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.