Volcanic rocks: mantle xenoliths     

Shervais JW 《Science (New York, N.Y.)》1988,241(4863):366-367

  相似文献   

Neutrinos: physics of massive neutrinos     

Witherell MS 《Science (New York, N.Y.)》1988,241(4869):1108

  相似文献   

Tried and True Prokaryotes: Escherichia coli and Salmonella typhimurium     

Friesen JD 《Science (New York, N.Y.)》1988,240(4859):1678-1680

  相似文献   

NSF Appoints Two Assistant Directors     

W J 《Science (New York, N.Y.)》1988,240(4855):980

  相似文献   

The Natural History of Nautilus. Peter Douglas Ward. Allen and Unwin, Winchester, MA, 1987. xiv, 267 pp., illus. $34.95; Nautilus. The Biology and Paleobiology of a Living Fossil. W. Bruce Saunders and Neil H. Landman, Eds. Plenum, New York, 1988. xxviii, 632 pp., illus., + plates. $95. Topics in Geobiology, vol. 6     

Vermeij GJ 《Science (New York, N.Y.)》1988,240(4855):1074-1075

  相似文献   

Gender at Work. The Dynamics of Job Segregation by Sex during World War II. Ruth Milkman. University of Illinois Press, Urbana, IL, 1987. xvi, 213 pp., illus. $32.50; paper, $8.95. The Working Class in American History     

Hirshfield DS 《Science (New York, N.Y.)》1988,240(4855):1064-1065

  相似文献   

Adolescent Mothers in Later Life. Frank F. Furstenberg, Jr., J. Brooks-Gunn, and S. Philip Morgan. Cambridge University Press, New York, 1987. xiv, 204 pp., illus. $27.95. Human Development in Cultural and Historical Contexts     

Mortimer JT 《Science (New York, N.Y.)》1988,240(4855):1060-1061

  相似文献   

Rapid growth of magnesium-carbonate weathering products in a stony meteorite from antarctica     

Jull AJ  Cheng S  Gooding JL  Velbel MA 《Science (New York, N.Y.)》1988,242(4877):417-419

Nesquehonite, a hydrous magnesium carbonate, occurs as a weathering product on the surface of the Antarctic meteorite LEW 85320(H5 chondrite). Antarctic meteorites have resided on the earth for periods of 10(4) to 10(6) years, but the time needed for weathering products to form has been uncertain. Isotopic measurements of delta(13)C and delta(18)O indicate that the nesquehonite formed at near freezing temperatures by reaction of meteoritic minerals with terrestrial water and carbon dioxide. Results from carbon-14 dating suggest that, although the meteorite has been in Antarctica for at least 3.2 x 10(4) to 3.3 x 10(4) years, the nesquehonite formed after A.D.1950.  相似文献   

Famine Early Warning System Wins Its Spurs: Monitoring program that spotted new crisis in Ethiopia sheds temporary status, but more is being asked of it     

Walsh J 《Science (New York, N.Y.)》1988,239(4837):249-250

  相似文献   

Olmec settlement data from la venta, tabasco, Mexico     

Rust WF  Sharer RJ 《Science (New York, N.Y.)》1988,242(4875):102-104

Research at La Venta, a major Olmec center on a low salt dome 12 kilometers from the Gulf Coast has revealed evidence of initial occupation (about 1750 to 1400 B.C.) along levees of the silted-in Río Barí, north of the site core in a transitional estuarine-riverine environment. Between 1400 and 1150 B.C. settlement expanded to nearby La Venta itself, which between 1150 and 800 B.C. developed into a major temple-town complex. Local development peaked at La Venta and along the river levees between 800 and 500 B.C. In this span La Venta headed a local three-tiered site hierarchy as social distinctions expanded to the peripheral Río Barí sites. New excavations show that growth in population size and density at La Venta preceded the development of sociopolitical complexity. These data contradict the traditional organizational reconstruction of Olmec society, the "vacant ceremonial center" model, and provide qualified support for a model that presents riverine resource concentration as a significant factor in the evolution of Olmec civilization.  相似文献