Gram, Christian

Gram, Christian, 77 7 Gram-Schmidt chromatogram, 74 233 Grand canonical ensemble, 7 33 Grand Composite Curve (GCC), 73 221, 20 737-738... 

This classification is based on whether or not the bacteria take up the Gram stain, devised by Christian Gram in 1884. 

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). 

Discovered by Christian Gram, Danish bacteriologist, in 1884. Gram-positive bacteria are those which, exposed in turn to crystal violet, iodine, and ethanol, are stained purple. 

The name murein was bestowed byJ.T. Park (1966), the first chemical investigator of the mode of action of penicillin. For Christian Gram and his stain, see footnote on p. 20. 

The Danish bacteriologist Christian Gram (1853-1938) gained in ter-nationa reputation by discovering in 1884 a technique of staining the heat-fixed smear of a bacterial culture with crystal violet and Iodine. 

Triose phosphate dehydrogenase has been studied both as a chemical molecule and as a catalyst. These studies were made possible by the availability of gram quantities of crystalline enzyme from rabbit muscle, by the procedure of Cori, Slein, and Cori, and from yeast, by the procedure of Warburg and Christian. Krebs has isolated four fractions from yeast with equivalent specific activity, one of which is the enzyme crystallized by Warburg and Christian. The four components make up about 5 per cent of the total extractable protein of the yeast. 

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