RHYTHMS AND GEOLOGIC TIME     

Gilbert GK 《Science (New York, N.Y.)》1900,11(287):1001-1012

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UNIVERSITY AND EDUCATIONAL NEWS     

Gilbert GK 《Science (New York, N.Y.)》1898,7(160):94-95

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A CASE OF PLAGIARISM     

Gilbert GK 《Science (New York, N.Y.)》1904,20(499):115-116

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Giant birefringent optics in multilayer polymer mirrors     

Weber MF  Stover CA  Gilbert LR  Nevitt TJ  Ouderkirk AJ 《Science (New York, N.Y.)》2000,287(5462):2451-2456

Multilayer mirrors that maintain or increase their reflectivity with increasing incidence angle can be constructed using polymers that exhibit large birefringence in their indices of refraction. The most important feature of these multilayer interference stacks is the index difference in the thickness direction (z axis) relative to the in-plane directions of the film. This z-axis refractive index difference provides a variable that determines the existence and value of the Brewster's angle at layer interfaces, and it controls both the interfacial Fresnel reflection coefficient and the phase relations that determine the optics of multilayer stacks. These films can yield optical results that are difficult or impossible to achieve with conventional multilayer optical designs. The materials and processes necessary to fabricate such films are amenable to large-scale manufacturing.  相似文献   

The "sunday seminar"     

Ptashne M  Gilbert W  Baltimore D  Gefter M  Steitz J  Bishop M  Guthrie C  Boyer H  Sobell H  Abelson J  Alberts B 《Science (New York, N.Y.)》1976,191(4224):245

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Paleo-Eskimo mtDNA genome reveals matrilineal discontinuity in Greenland     

Gilbert MT  Kivisild T  Grønnow B  Andersen PK  Metspalu E  Reidla M  Tamm E  Axelsson E  Götherström A  Campos PF  Rasmussen M  Metspalu M  Higham TF  Schwenninger JL  Nathan R  De Hoog CJ  Koch A  Møller LN  Andreasen C  Meldgaard M  Villems R  Bendixen C  Willerslev E 《Science (New York, N.Y.)》2008,320(5884):1787-1789

The Paleo-Eskimo Saqqaq and Independence I cultures, documented from archaeological remains in Northern Canada and Greenland, represent the earliest human expansion into the New World's northern extremes. However, their origin and genetic relationship to later cultures are unknown. We sequenced a mitochondrial genome from a Paleo-Eskimo human by using 3400-to 4500-year-old frozen hair excavated from an early Greenlandic Saqqaq settlement. The sample is distinct from modern Native Americans and Neo-Eskimos, falling within haplogroup D2a1, a group previously observed among modern Aleuts and Siberian Sireniki Yuit. This result suggests that the earliest migrants into the New World's northern extremes derived from populations in the Bering Sea area and were not directly related to Native Americans or the later Neo-Eskimos that replaced them.  相似文献   

Extracellular proteins limit the dispersal of biogenic nanoparticles     

Moreau JW  Weber PK  Martin MC  Gilbert B  Hutcheon ID  Banfield JF 《Science (New York, N.Y.)》2007,316(5831):1600-1603

High-spatial-resolution secondary ion microprobe spectrometry, synchrotron radiation-based Fourier-transform infrared spectroscopy, and polyacrylamide gel analysis demonstrated the intimate association of proteins with spheroidal aggregates of biogenic zinc sulfide nanocrystals, an example of extracellular biomineralization. Experiments involving synthetic zinc sulfide nanoparticles and representative amino acids indicated a driving role for cysteine in rapid nanoparticle aggregation. These findings suggest that microbially derived extracellular proteins can limit the dispersal of nanoparticulate metal-bearing phases, such as the mineral products of bioremediation, that may otherwise be transported away from their source by subsurface fluid flow.  相似文献   

More haemophilus and Mycoplasma genes     

Robison K  Gilbert W  Church GM 《Science (New York, N.Y.)》1996,271(5253):1302a-1303b

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Evolutionary phytochemistry     

Gilbert LE 《Science (New York, N.Y.)》1977,195(4276):387

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Experimental Shark Pens at the Lerner Marine Laboratory     

Gilbert PW  Kritzler H 《Science (New York, N.Y.)》1960,132(3424):424

A new facility has recently been added at the Lerner Marine Laboratory, Bimini, Bahamas, which makes it possible for the first time to work experimentally with large elasmobranchs up to 15 feet in length.  相似文献