Gram, Hans Christian

Gram-negative organisms also interact with methyl violet, but the colouration can be removed by washing and the bacteria can then take up a different stain, usually safranine, which stains them pink. This classification is named after Hans Christian Joachim Gram, a Danish bacteriologist, who first described it in 1884. It is, of course, an extension of the ideas of Ehrlich who first used a dyestuff to identify the tubercle bacillus. 

Aluminum is a silvety-white metalfic element discovered in 1825 by Danish chemist Hans Christian 0rsted. It is the most abtmdant metal fotmd in Earth s crust, comprising 8.3 percent of the crust s total weight. Its content in seawater, however, is as low as 0.01 gram per metric ton (0.01 part per million). The key isotope of aluminum is Al with a natural abundance of 100 percent, but seven other isotopes are known, one of which is used as a radioactive tracer ( " Al). 

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