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.
Here's Why We Have Daylight Saving Time. Get ready to change your clocks, folks. Daylight saving time is ending this year as it celebrates its centennial anniversary. One hundred years ago, Germany was the first to implement the concept on May 1, 1916; however, they werenât the first to come up with the energy-saving concept.