Asbestos: trouble in the air from Maryland rock quarry     

Carter LJ 《Science (New York, N.Y.)》1977,197(4300):237-240

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Band gap fluorescence from individual single-walled carbon nanotubes   总被引：1，自引：0，他引：1  

O'Connell MJ  Bachilo SM  Huffman CB  Moore VC  Strano MS  Haroz EH  Rialon KL  Boul PJ  Noon WH  Kittrell C  Ma J  Hauge RH  Weisman RB  Smalley RE 《Science (New York, N.Y.)》2002,297(5581):593-596

Fluorescence has been observed directly across the band gap of semiconducting carbon nanotubes. We obtained individual nanotubes, each encased in a cylindrical micelle, by ultrasonically agitating an aqueous dispersion of raw single-walled carbon nanotubes in sodium dodecyl sulfate and then centrifuging to remove tube bundles, ropes, and residual catalyst. Aggregation of nanotubes into bundles otherwise quenches the fluorescence through interactions with metallic tubes and substantially broadens the absorption spectra. At pH less than 5, the absorption and emission spectra of individual nanotubes show evidence of band gap-selective protonation of the side walls of the tube. This protonation is readily reversed by treatment with base or ultraviolet light.  相似文献   

Three-dimensional structure of human serum albumin   总被引：11，自引：0，他引：11  

D C Carter  X M He  S H Munson  P D Twigg  K M Gernert  M B Broom  T Y Miller 《Science (New York, N.Y.)》1989,244(4909):1195-1198

The three-dimensional structure of human serum albumin has been solved at 6.0 angstrom (A) resolution by the method of multiple isomorphous replacement. Crystals were grown from solutions of polyethylene glycol in the infrequently observed space group P42(1)2 (unit cell constants a = b = 186.5 +/- 0.5 A and c = 81.0 +/- 0.5 A) and diffracted x-rays to lattice d-spacings of less than 2.9 A. The electron density maps are of high quality and revealed the structure as a predominantly alpha-helical globin protein in which the course of the polypeptide can be traced. The binding loci of several organic compounds have been determined.  相似文献   

Duke university: students demand new deal for negro workers     

Carter LJ 《Science (New York, N.Y.)》1968,160(3827):513-517

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Industrial minerals: new study of how to avoid a supply crisis     

Carter LJ 《Science (New York, N.Y.)》1970,170(3954):147-148

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Post-Apollo: NASA Seeks a Mars Flight Plan     

Carter LJ 《Science (New York, N.Y.)》1969,165(3897):987-991

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Relaxation seen in nonproliferation policy     

Carter LJ 《Science (New York, N.Y.)》1979,206(4414):32-36

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Alaska pipeline: congress deaf to environmentalists     

Carter LJ 《Science (New York, N.Y.)》1973,181(4097):326

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Anterior cingulate conflict monitoring and adjustments in control     

Kerns JG  Cohen JD  MacDonald AW  Cho RY  Stenger VA  Carter CS 《Science (New York, N.Y.)》2004,303(5660):1023-1026

Conflict monitoring by the anterior cingulate cortex (ACC) has been posited to signal a need for greater cognitive control, producing neural and behavioral adjustments. However, the very occurrence of behavioral adjustments after conflict has been questioned, along with suggestions that there is no direct evidence of ACC conflict-related activity predicting subsequent neural or behavioral adjustments in control. Using the Stroop color-naming task and controlling for repetition effects, we demonstrate that ACC conflict-related activity predicts both greater prefrontal cortex activity and adjustments in behavior, supporting a role of ACC conflict monitoring in the engagement of cognitive control.  相似文献   

Human brain tumor--derived cell lines: growth rate reduced by human fibroblast interferon     

A W Cook  W A Carter  F Nidzgorski  L Akhtar 《Science (New York, N.Y.)》1983,219(4586):881-883

The biological response modifier human beta-interferon had pronounced antigrowth effects on various histologic types of human brain tumor cells but no effects on a nontransformed cell line, MRC-5. The cultures of brain tumor cells showed severe alterations indicative of cell injury and death after exposure to beta-interferon for 2 to 6 days. Similar results were obtained with cells freshly explanted from human brain tumors. The results indicate that it may be possible to use fresh, explanted tumor tissue to identify patients who might benefit from therapy with beta-interferon.  相似文献