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4 days ago · Automated particle and cell counters came around in 1953 thanks to Walter Coulter, who used electric resistance to capture a cell count, known as the Coulter Principle. Naturally resistant to electricity, cells would pass through a single stream between two electrodes conducting a current.
3 days ago · 1908 - Bernhard Walter and Robert Wichard Pohl observed X-ray diffraction from a slit. 1912 - Max von Laue discovered diffraction patterns from crystals in an x-ray beam. 1912 - Bragg diffraction, expressed through Bragg’s law, is first presented by Lawrence Bragg on 11 November 1912 to the Cambridge Philosophical Society.
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14 hours ago · e. LGBT history dates back to the first recorded instances of same-sex love and sexuality of ancient civilizations, involving the history of lesbian, gay, bisexual, and transgender ( LGBT) peoples and cultures around the world. What survives after many centuries of persecution—resulting in shame, suppression, and secrecy—has only in more ...
Memorial Day is supposed to be about mourning the nation’s fallen service members. But it’s come to anchor the unofficial start of summer and retail discounts.
2 days ago · Renée Lynn Fleming (born February 14, 1959) is an American soprano, known for performances in opera, concerts, recordings, theater, film, and at major public occasions. A recipient of the National Medal of Arts, Fleming has been nominated for 18 Grammy Awards and has won five times.
14 hours ago · Adam J. Fein, president of the industry research organization Drug Channels Institute, reports that the 340B program is the second-largest federal drug program, trailing Medicare Part D. The flow ...
5 days ago · Definitions of cell theory. noun. (biology) the theory that cells form the fundamental structural and functional units of all living organisms; proposed in 1838 by Matthias Schleiden and by Theodor Schwann. synonyms: cell doctrine. see more.
