Cell biology. Ancient neurons regulate immunity     

Tracey KJ 《Science (New York, N.Y.)》2011,332(6030):673-674

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Space research in the era of the space station     

Frost KJ  McDonald FB 《Science (New York, N.Y.)》1984,226(4681):1381-1385

With the continuing flights and increasing capabilities of the space shuttle, and with the design and development of a space station, there will be a 0 significant increase in our space research capabilities during the 1990's. Ways in which the nation's space science program may evolve in response to these developments are described.  相似文献   

Convenient Method for Recognizing Nonopaque Cerium Earth Minerals     

Murata KJ  Bastron H 《Science (New York, N.Y.)》1956,123(3203):888-889

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Immunology. Regulating the regulators     

Powrie F  Maloy KJ 《Science (New York, N.Y.)》2003,299(5609):1030-1031

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Atherosclerosis and inflammation     

Williams KJ  Tabas I 《Science (New York, N.Y.)》2002,297(5581):521-522

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Environment. Environmental monitoring network for India     

Sundareshwar PV  Murtugudde R  Srinivasan G  Singh S  Ramesh KJ  Ramesh R  Verma SB  Agarwal D  Baldocchi D  Baru CK  Baruah KK  Chowdhury GR  Dadhwal VK  Dutt CB  Fuentes J  Gupta PK  Hargrove WW  Howard M  Jha CS  Lal S  Michener WK  Mitra AP  Morris JT  Myneni RR  Naja M  Nemani R  Purvaja R  Raha S  Vanan SK  Sharma M  Subramaniam A  Sukumar R  Twilley RR  Zimmerman PR 《Science (New York, N.Y.)》2007,316(5822):204-205

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Shock-induced localized amorphization in boron carbide     

Chen M  McCauley JW  Hemker KJ 《Science (New York, N.Y.)》2003,299(5612):1563-1566

High-resolution electron microscope observations of shock-loaded boron carbide have revealed the formation of nanoscale intragranular amorphous bands that occur parallel to specific crystallographic planes and contiguously with apparent cleaved fracture surfaces. This damage mechanism explains the measured, but not previously understood, decrease in the ballistic performance of boron carbide at high impact rates and pressures. The formation of these amorphous bands is also an example of how shock loading can result in the synthesis of novel structures and materials with substantially altered properties.  相似文献   

Widespread intense turbulent mixing in the Southern Ocean     

Garabato AC  Polzin KL  King BA  Heywood KJ  Visbeck M 《Science (New York, N.Y.)》2004,303(5655):210-213

Observations of internal wave velocity fluctuations show that enhanced turbulent mixing over rough topography in the Southern Ocean is remarkably intense and widespread. Mixing rates exceeding background values by a factor of 10 to 1000 are common above complex bathymetry over a distance of 2000 to 3000 kilometers at depths greater than 500 to 1000 meters. This suggests that turbulent mixing in the Southern Ocean may contribute crucially to driving the upward transport of water closing the ocean's meridional overturning circulation, and thus needs to be represented in numerical simulations of the global ocean circulation and the spreading of biogeochemical tracers.  相似文献   

Electron solvation in two dimensions     

Miller AD  Bezel I  Gaffney KJ  Garrett-Roe S  Liu SH  Szymanski P  Harris CB 《Science (New York, N.Y.)》2002,297(5584):1163-1166

Ultrafast two-photon photoemission has been used to study electron solvation at two-dimensional metal/polar-adsorbate interfaces. The molecular motion that causes the excess electron solvation is manifested as a dynamic shift in the electronic energy. Although the initially excited electron is delocalized in the plane of the interface, interactions with the adsorbate can lead to its localization. A method for determining the spatial extent of the localized electron in the plane of the interface has been developed. This spatial extent was measured to be on the order of a single adsorbate molecule.  相似文献   

A closer look at water-related geologic activity on Mars     

McEwen AS  Hansen CJ  Delamere WA  Eliason EM  Herkenhoff KE  Keszthelyi L  Gulick VC  Kirk RL  Mellon MT  Grant JA  Thomas N  Weitz CM  Squyres SW  Bridges NT  Murchie SL  Seelos F  Seelos K  Okubo CH  Milazzo MP  Tornabene LL  Jaeger WL  Byrne S  Russell PS  Griffes JL  Martínez-Alonso S  Davatzes A  Chuang FC  Thomson BJ  Fishbaugh KE  Dundas CM  Kolb KJ  Banks ME  Wray JJ 《Science (New York, N.Y.)》2007,317(5845):1706-1709

Water has supposedly marked the surface of Mars and produced characteristic landforms. To understand the history of water on Mars, we take a close look at key locations with the High-Resolution Imaging Science Experiment on board the Mars Reconnaissance Orbiter, reaching fine spatial scales of 25 to 32 centimeters per pixel. Boulders ranging up to approximately 2 meters in diameter are ubiquitous in the middle to high latitudes, which include deposits previously interpreted as finegrained ocean sediments or dusty snow. Bright gully deposits identify six locations with very recent activity, but these lie on steep (20 degrees to 35 degrees) slopes where dry mass wasting could occur. Thus, we cannot confirm the reality of ancient oceans or water in active gullies but do see evidence of fluvial modification of geologically recent mid-latitude gullies and equatorial impact craters.  相似文献