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A Gram Mass: SRAM, a unit of mass or weight in the metric ystem. A gram mass is defined as 1/1000 of he International Prototype Kilogram, a cylinder f iridium-platinum alloy kept at the International tureau of Weights and Measures in Sevres, Vance. The gram weight is defined as the /eight of a gram mass under standard gravity, 'he gram equals about 1/28.35 avoirdupois unce. A U. S. silver dime weighs about 2 grams. In the original metric system the gram was efined as the mass of 1 cubic centimeter of 'ater at its maximum density. Its name was erived from the Latin word gramma meaning little weight."RAMICIDIN, gram-a-sid'an, is an antibiotic iat is one of the components of tyrothricin, the rst antibiotic used clinically. Gramicidin is articularly effective against the growth of gram-asitive bacteria such as pneumococci, strep-icocci, staphylococci, and diphtheria bacilli, hile tyrocidine—the other component of tyrothri-n—is also active against gram-negative bacteria.
GRAM, gram, Hans Christian Joachim (1853-1938), Danish bacteriologist, who developed a method of staining bacteria for microscopic study. Gram was born in Copenhagen on Sept. 13, 1853. He passed the University of Copenhagen final medical examinations in 1878 and in 1883 received his doctorate. He then continued his studies in Germany. |
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