The Half Windsor Knot Tying Instructions. 1  1. Start with the wide end of the tie on the right and the small end on the left. 2  The tip of the small end should rest slightly above your belly-button (this will vary depending on your height and the length & thickness of your tie).
Ethidium bromide is an intercalating agent commonly used as a fluorescent tag (nucleic acid stain) in molecular biology laboratories for techniques such as agarose gel electrophoresis. It is commonly abbreviated as EtBr , which is also an abbreviation for bromoethane.
NIH Disposal Requirements. Dispose of ethidium bromide following requirements for Chemical Waste. Ethidium bromide in aqueous waste solutions may be concentrated on filtration media to minimize disposal volumes. Do not treat waste solutions with bleach (sodium hypochlorite); this increases waste volumes and treatment products are mutagenic.