Electroencephalographic evidence for retention of olfactory cues in homing coho salmon     

Cooper JC  Hasler AD 《Science (New York, N.Y.)》1974,183(4122):336-338

Differences were observed in the magnitude of the evoked electroencephalographic response to 1 percent morpholine for homing coho salmon (Oncorhynchus kisutch) exposed to morpholine as fingerlings 1 month before smolting as compared to salmon not exposed to morpholine as fingerlings. These results indicate that olfactory information has been retained for 18 months, the period between smolting and the homeward migration.  相似文献   

Crystal structure analysis of deamino-oxytocin: conformational flexibility and receptor binding   总被引：1，自引：0，他引：1  

S P Wood  I J Tickle  A M Treharne  J E Pitts  Y Mascarenhas  J Y Li  J Husain  S Cooper  T L Blundell  V J Hruby 《Science (New York, N.Y.)》1986,232(4750):633-636

Two crystal structures of deamino-oxytocin have been determined at better than 1.1A resolution from isomorphous replacement and anomalous scattering x-ray measurements. In each of two crystal forms there are two closely related conformers with disulfide bridges of different chirality, which may be important in receptor recognition and activation.  相似文献   

Experimental allergic encephalomyelitis in agammaglobulinemic chickens   总被引：4，自引：0，他引：4  

M E Blaw  M D Cooper  R A Good 《Science (New York, N.Y.)》1967,158(805):1198-1200

White Leghorn chickens were subjected to bursectomy and total body irradiation at hatching, thus rendering them agammaglobulinemic. At 4 weeks of age, these chickens and control chickens received lyophilized bovine spinal cord emulsified with complete Freund's adjuvant. Agammaglobulinemic chickens developed the lesions of allergic encephalomyelitis with the same frequency and intensity as the controls. Our findings support the contention that antibodies are not necessary for the development of experimental allergic encephalomyelitis.  相似文献   

Response     

Reis DJ  Li G  Regunathan S  Barrow CJ  Cooper R 《Science (New York, N.Y.)》1994,266(5184):463-464

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Cosmogenic and primordial radionuclides in lunar samples by nondestructive gamma-ray spectrometry     

Perkins RW  Rancitelli LA  Cooper JA  Kaye JH  Wogman NA 《Science (New York, N.Y.)》1970,167(3918):577-580

The (7)Be, (22)Na, (26)Al, (44)Ti, (46)SC, (48)V (51)Cr, (54)Mn, (56)Co, (57)Co, (57)CO, (40)K, (238)U, and (232)Th were measured in lunar fines and portions of three rocks. Major production of cosmogenic radionuclides is due to solar protons, thus their concentrations are far different than those in meteorites. Surface exposures of the rocks and fines are long compared with the 0.74 million year half-life of (26)Al. Lunar fines show substantially higher concentrations of low energy reaction products. The ratios of thorium to uranium are extremely constant at 3.8, which indicates very little geochemical differentiation and are in good agreement with a common nucleosynthesis for lunar and earth materials.  相似文献   

Cosmic ray-produced radionuclides as tracers of atmospheric precipitation processes     

Wogman NA  Thomas CW  Cooper JA  Engelmann RJ  Perkins RW 《Science (New York, N.Y.)》1968,159(3811):189-192

Through recent developments in instrumental analysis it is now possible to measure with good precision the rainwater concentrations of five short-lived radionuclides which are produced by cosmic ray spallation of atmospheric argon. These measurements provide a method for studying the in-cloud nucleation times and aerosol scavenging efficiencies, and promise to provide information onshort-term processes which occur in rain and snow formation.  相似文献   

LOCALIZATION OF LITHIUM IN TUMOR TISSUE AS A BASIS FOR SLOW NEUTRON THERAPY     

Zahl PA  Cooper FS 《Science (New York, N.Y.)》1941,93(2403):64-65

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Diverse plant and animal genetic records from Holocene and Pleistocene sediments   总被引：1，自引：0，他引：1  

Willerslev E  Hansen AJ  Binladen J  Brand TB  Gilbert MT  Shapiro B  Bunce M  Wiuf C  Gilichinsky DA  Cooper A 《Science (New York, N.Y.)》2003,300(5620):791-795

Genetic analyses of permafrost and temperate sediments reveal that plant and animal DNA may be preserved for long periods, even in the absence of obvious macrofossils. In Siberia, five permafrost cores ranging from 400,000 to 10,000 years old contained at least 19 different plant taxa, including the oldest authenticated ancient DNA sequences known, and megafaunal sequences including mammoth, bison, and horse. The genetic data record a number of dramatic changes in the taxonomic diversity and composition of Beringian vegetation and fauna. Temperate cave sediments in New Zealand also yielded DNA sequences of extinct biota, including two species of ratite moa, and 29 plant taxa characteristic of the prehuman environment. Therefore, many sedimentary deposits may contain unique, and widespread, genetic records of paleoenvironments.  相似文献   

Uplifted marine terraces along the alpine fault, new zealand     

Bull WB  Cooper AF 《Science (New York, N.Y.)》1986,234(4781):1225-1228

Three types of evidence indicate that marine terraces are widespread in the Southern Alps of New Zealand. (i) Remnants of shore platforms occur as distinct levels of notched ridge crests and flat summits; degraded sea cliffs are common. (ii) Scattered quartz beach pebbles occur on 16 of 18 levels of exhumed shore platforms in the Fox- Franz Josef type area to altitudes as high as 1700 meters. (iii) Altitudinal spacings of New Zealand terrace flights allow correlation with 18 dated global marine terraces at New Guinea, which were formed during glacio-eustatic highstands of sea level within the last 336 x 10(3) years. Inferred uplift rates at Fox-Franz Josef increased from 3.2 to 7.8 meters per 10(3) years since about 135 x 10(3) to 140 x 10(3) years ago, presumably because of increased convergence between the Pacific and Australian plates.  相似文献   

Cellular transforming genes   总被引：65，自引：0，他引：65  

G M Cooper 《Science (New York, N.Y.)》1982,217(4562):801-806

Cellular genes potentially capable of inducing oncogenic transformation have been identified by homology to the transforming genes of retroviruses and by the biological activity of cellular DNA's in transfection assays. DNA's of various tumors induce transformation with high efficiencies, indicating that oncogenesis can involve dominant genetic alterations resulting in activation of cellular transforming genes. The identification and characterization of cellular transforming genes and their possible involvement in naturally occurring cancers, is discussed.  相似文献