U.S. National Academy
نویسندگان
چکیده
منابع مشابه
National Academy of Sciences.
Science, new ser., vol. 32, p. 224.Un medallion de Jacques Cartier. Revue Canadienne, new ser., vol. 5, pp. 6-15, ill.Age of the Gaspe sandstone. (Discussion.) Bull. Geol. Soc.America, vol. 20, pp. 696-697.New York State Museum. Its organization and scope. N. Y.State Education Dept, Circular.Sixth report of the Director of the Science Division, including the 63d report o...
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vital importance of the energy in national and international economic development has made oil as a crucial and attractive factor for great powers. these powers have had permanent competition for establishing an oil system for securing their national interests. the persian gulf has been focal point of these competitions. after september 11, 2001, the role of oil has considered as one of the mos...
متن کاملProceedings of the NATIONAL ACADEMY OF SCIENCES
Introduction.-It has been shown earlierl 2 that the synthesis of the isoprenoid, rubber, by a rubber-bearing plant, guayule (Parthenium argentatum), involves acetate as an, intermediate. Not only does the administration of acetate to this plant result in a net increase in the amount of rubber formed, but, in addition, rubber synthesized by plants supplied with doubly C"4-labeled acetate possess...
متن کاملThe National Academy of Sciences at 150.
of the United States and began to compile data annually to provide the record of all sorts of domains of American life. Data on population, finance, commerce, agriculture, exports, mining, railroads, telegraphs, immigration, education, and public lands were all published and developed into time series collections thereafter. The leaders of the Federal Statistical System became major leaders in ...
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ژورنال
عنوان ژورنال: Nature
سال: 1879
ISSN: 0028-0836,1476-4687
DOI: 10.1038/021143a0