Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The horizontal fraction bar was introduced by the Arabs.
This chart shows the various lines of responsibility and how they differ in presidential and parliam
A direct injection diesel engine injects the fuel directly into the combustion chamber. Many ...
Protective gloves are available in several sizes and materials.
Using a digital multimeter to test an oxygen sensor using the MIN/MAX record function of the meter.
Radioactive protection services record book and two badge-style dosimeters.
Schematic pathway of oligosaccharide processing on newly synthesized glycoproteins