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.
Ethidium Bromide Staining. The most commonly used stain for detecting DNA/RNA is ethidium bromide. Ethidium bromide is a DNA interchelator, inserting itself into the spaces between the base pairs of the double helix. Ethidium bromide possesses UV absorbance maxima at 300 and 360 nm.