1 4/2 and 4/8 are also simple quadruple. 2  Notice that a time signature in simple meter will always have a 2, 3, or 4 for the top number. 3  While beats in simple meter are divided into two notes, beats in compound meter are divided into three. 4  To demonstrate this, we will examine 6/8 time.
The Discovery and Isolation of Caffeine. Caffeine has been used as a medicinal and recreational drug since before recorded history, by consumption of caffeine bearing plants. However, the discovery of the chemical did not occur until a young physician called Friedlieb Ferdinand Runge isolated and purified the white crystalline substance in 1819.
HIV was first isolated in France in 1983 by FranÃ§oise BarrÃ©-Sinoussi in the laboratory of Luc Montaignier as lymphadenopathy-associated virus (LAV), but strong evidence that it was the AIDS virus did not appear until 1984, when four papers were published in one issue of Science by Robert Gallo and colleagues, who designated their isolate HTLV-III. The virus was also isolated in San Francisco in 1984 by Jay Levy, who published his findings a few months later in 1984 and named his isolate ...