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. Additionally, it can absorb energy from nucleotides excited by absorbance of 260 nm radiation.