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.thidium bromide is thought to act as a mutagen because it intercalates double stranded DNA (i.e., inserts itself between the strands), deforming the DNA. This could affect DNA biological processes, like DNA replication and transcription.
DAYS IN EACH MONTH. 30 days hath September, April, June and November, All the rest have 31, Excepting February alone (And that has 28 days clear, With 29 in each leap year). The number of days in each month has remained unchanged for 2000 years (since 45 B.C. in fact, when Julius Caesar introduced the Julian Calendar). Here's a well-known mnemonic rhyme which has been in existence for over 400 years, to indicate the exact number of days in each different month:
March (Mar) 2023 There are 31 days in this month. April (Apr) 2023 There are 30 days in this month. May (May) 2023 There are 31 days in this month. June (Jun) 2023 There are 30 days in this month. July (Jul) 2023 There are 31 days in this month.