THREE ICE STORMS     

Brooks CF 《Science (New York, N.Y.)》1913,38(971):193-194

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Pseudo-scientific Humbuggery     

Cox CF 《Science (New York, N.Y.)》1888,12(305):277-278

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PLANT FORMS EXISTING IN NATURE AND THEIR RELATION TO BOTANICAL RESEARCH     

Baker CF 《Science (New York, N.Y.)》1906,23(595):804-812

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Greenland ice evidence of hemispheric lead pollution two millennia ago by greek and roman civilizations   总被引：2，自引：0，他引：2  

Hong S  Candelone JP  Patterson CC  Boutron CF 《Science (New York, N.Y.)》1994,265(5180):1841-1843

Analysis of the Greenland ice core covering the period from 3000 to 500 years ago-the Greek, Roman, Medieval and Renaissance times-shows that lead is present at concentrations four times as great as natural values from about 2500 to 1700 years ago (500 B.C. to 300 A.D.). These results show that Greek and Roman lead and silver mining and smelting activities polluted the middle troposphere of the Northern Hemisphere on a hemispheric scale two millennia ago, long before the Industrial Revolution. Cumulative lead fallout to the Greenland Ice Sheet during these eight centuries was as high as 15 percent of that caused by the massive use of lead alkyl additives in gasoline since the 1930s. Pronounced lead pollution is also observed during Medieval and Renaissance times.  相似文献   

A RAPID STAINING METHOD FOR RICKETTSIA ORIENTALIS     

Clancy CF  Wolfe DM 《Science (New York, N.Y.)》1945,102(2654):483

A rapid method for staining R. orientalis is described. Smears of infected tissues are defatted and stained in a dilute aqueous solution of methylene blue and basic fuchsin. Smears thus stained show R. orientalis as blue organisms on a pinkish-purple background.  相似文献   

Thermal annealment and nitric oxide effects on free radicals in x-irradiated cells     

EHRET CF  SMALLER B  POWERS EL  WEBB RB 《Science (New York, N.Y.)》1960,132(3441):1768-1769

Four kinds of radicals are identified in dry spores (Bacillus megaterium) after x-irradiation: those associated with singlet, doublet, triplet, and oxygen-complex types of spectra. The singlet, present only at low temperatures, gives rise irreversibly to the doublet at 25 degrees C. All hyperfine structure is depressed after annealment at 1000 degrees C and is lost when oxygen or nitric oxide is added. The physical results support the hypothesis that reactions of long-lived free radicals can account for the radiobiological phenomena of thermorestoration, nitric oxide protection, and latent oxygen effect.  相似文献   

Chemical transformations in individual ultrasmall biomimetic containers     

Chiu DT  Wilson CF  Ryttsén F  Strömberg A  Farre C  Karlsson A  Nordholm S  Gaggar A  Modi BP  Moscho A  Garza-López RA  Orwar O  Zare RN 《Science (New York, N.Y.)》1999,283(5409):1892-1895

Individual phospholipid vesicles, 1 to 5 micrometers in diameter, containing a single reagent or a complete reaction system, were immobilized with an infrared laser optical trap or by adhesion to modified borosilicate glass surfaces. Chemical transformations were initiated either by electroporation or by electrofusion, in each case through application of a short (10-microsecond), intense (20 to 50 kilovolts per centimeter) electric pulse delivered across ultramicroelectrodes. Product formation was monitored by far-field laser fluorescence microscopy. The ultrasmall characteristic of this reaction volume led to rapid diffusional mixing that permits the study of fast chemical kinetics. This technique is also well suited for the study of reaction dynamics of biological molecules within lipid-enclosed nanoenvironments that mimic cell membranes.  相似文献   

WIDER USE FOR ACADEMY OF SCIENCE PUBLICATIONS THROUGH IMPROVED DISTRIBUTION     

Sharpe CF 《Science (New York, N.Y.)》1940,92(2392):403-405

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Total carbon and nitrogen abundances in lunar samples     

Moore CB  Lewis CF  Gibson EK  Nichiporuk W 《Science (New York, N.Y.)》1970,167(3918):495-497

Total carbon and nitrogen abundances were determined by using combustion-gas chromatographic techlniques. Weighited mean analyses for butlk fines were 225 and 140 ppm total carbon and 150 anid 100 ppm total nitrogen. Total carbon in fine breccia was 230 ppm; in coarse breccia, 100 ppmn; in fine-grained rock, 70 ppm; and in mediumn-grained rock, 64 ppm. The finest sieved fraction had the highest carbon content. Total nitrogen in fine breccia was 125 ppm; in coarse breccia, 100 ppm; in fine-grained rock, 115 ppm; and in medium-grained rock, 30 ppm. The total carbon and nitrogen finies appeat to be mixtuires of indigenous lunar material togetheer with meteoritic and solar wind components.  相似文献   

Hoabinhian: a pebble-tool complex with early plant associations in southeast Asia     

Gorman CF 《Science (New York, N.Y.)》1969,163(3868):671-673

The term "Hoabinhian" has been applied to "mesolithic" assemblages from all parts of mainland Southeast Asia. Recent excavation in north Thailand has yielded the first associated carbon-14 dates and provided evidence for the early (about 7000 B. C.) domestication of plants in Southeast Asia.  相似文献