General Pharmacology. Beta-blockers are drugs that bind to beta-adrenoceptors and thereby block the binding of norepinephrine and epinephrine to these receptors. This inhibits normal sympathetic effects that act through these receptors. Therefore, beta-blockers are sympatholytic drugs.
Don't know much about the origins of daylight saving time? Maybe it's time to learn about the semi-annual time shift, which goes into effect on Sunday across most of the U.S. and in 69 other countries around the world. Benjamin Franklin is sometimes credited with the invention of daylight saving time.
History of Daylight Saving Time â DST. Daylight Saving Time (DST) is used to save energy and make better use of daylight. It was first used in 1908 in Thunder Bay, Canada. DST normally adds 1 hour to standard time with the purpose of making better use of daylight and conserving energy. This means that the sunrise and sunset are one hour later, on the clock, than the day before.