Fluorescent lamp began with the Geissler tube continued as even better vacuums were produced. The most famous was the evacuated tube used for scientific research by William Crookes. That tube was evacuated by the highly effective mercury vacuum pump created by Hermann Sprengel. Research conducted by Crookes and others ultimately led to the discovery of the electron in 1897 by J. J. Thomson and X-rays in 1895 by Wilhelm Roentgen. But the Crookes tube, as it came to be known, produced little light because the vacuum in it was too good and thus lacked the trace amounts of gas that are needed
Sanford Burnham Prebys Medical Discovery Institute careers in basic and translational research through a curriculum of focused, multi-disciplinary instruction. In 2015, SBP achieved accreditation with the Western Association of Schools and Colleges. SBP also employs postdoctoral fellows; there are typically around 250 postdocs training at SBP at any time. The endowment was recorded at as low as $15.2 million, a 13 percent drop from nearly $17.5 million in February 2008, due largely to losses on investments. Its endowment stood at $22.5 million as of Dec. 31, 2009. Sanford Burnham Prebys Medical Discovery Institute Sanford Burnham Prebys Medical Discovery Institute (SBP) is a non-profit medical research institute