Linkage group-chromosome correlation in Culex tritaeniorhynchus     

R H Baker  R K Sakai  A Mian 《Science (New York, N.Y.)》1971,171(971):585-587

Linkage groups of a culicine mosquito, Culex tritaeniorhynchus, have been assigned to their respective chromosomes by genetic and cytologic observations of radiation-induced aberrations. Linkage group I is assigned to the smallest chromosome, linkage group II to the submetacentric chromosome, and linkage group III to the metacentric chromosome.  相似文献   

Climate change. Reassessing carbon sinks     

Baker DF 《Science (New York, N.Y.)》2007,316(5832):1708-1709

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Comet giacobini-zinner: plasma description     

Bame SJ  Anderson RC  Asbridge JR  Baker DN  Feldman WC  Fuselier SA  Gosling JT  McComas DJ  Thomsen MF  Young DT  Zwickl RD 《Science (New York, N.Y.)》1986,232(4748):356-361

A strong interaction between the solar wind and comet Giacobini-Zinner was observed oh 11 September 1985 with the Los Alamos plasma electron experiment on the International Cometary Explorer (ICE) spacecraft. As ICE approached an intercept point 7800 kilometers behind the nucleus from the south and receded to the north, upstream phenomena due to the comet were observed. Periods of enhanced electron heat flux from the comet as well as almost continuous electron density fluctuations were measured. These effects are related to the strong electron heating observed in the cometary interaction region and to cometary ion pickup by the solar wind, respectively. No evidence for a conventional bow shock was found as ICE entered and exited the regions of strongest interaction of the solar wind with the cometary environment. The outer extent of this strong interaction zone was a transition region in which the solar wind plasma was heated, compressed, and slowed. Inside the inner boundary of the transition region was a sheath that enclosed a cold intermediate coma. In the transition region and sheath, small-scale enhancements in density were observed. These density spikes may be due to an instability associated with cometary ion pickup or to the passage of ICE through cometary ray structures. In the center of the cold intermediate coma a narrow, high-density core of plasma, presumably the developing plasma tail was found. In some ways this tail can be compared to the plasma sheet in Earth's magnetotail and to the current sheet in the tail at Venus. This type of configuration is expected in the double-lobe magnetic topology detected at the comet, possibly caused by the theoretically expected draping of the interplanetary magnetic field around its ionosphere.  相似文献   

Another unmet public health need     

Baker SP  Baker TD 《Science (New York, N.Y.)》2002,296(5571):1237

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Copper porphyrins in deep-sea sediments: a possible indicator of oxidized terrestrial organic matter     

Palmer SE  Baker EW 《Science (New York, N.Y.)》1978,201(4350):49-51

Copper porphyrins have been isolated from deep-sea sediments collected during six legs of the Deep Sea Drilling Project-International Program of Ocean Drilling. These pigments are present in depositional areas receiving high inputs of terrestrially derived oxidized organic matter. Such areas include the Black Sea, the Bay of Biscay, the Blake-Bahama Basin, and slumped Miocene deposits off Cape Bojador on the west coast of Africa.  相似文献   

Optical differentiation of amoebic ectoplasm and endoplasmic flow     

W R Baker  J A Johnston 《Science (New York, N.Y.)》1967,156(3776):825-826

Optical activity differentiating the flowing and nionflowing amoebic cytoplasm was detected. This evidence indicates mtiolecular alignment in the flow stream and can be used to provide data on the direction of alignmtient. The results were obtained by utilizing a dynamnic polarized-light detection system which is sensitive only to specimenis which possess a preferred axis.  相似文献   

ON THE BEHAVIOR OF A GLASS PLATE FLOATING NEAR THE EDGE OF A FLAT-TOPPED DROP OF MERCURY     

Baker WC 《Science (New York, N.Y.)》1932,76(1969):279-280

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GLUCOSE AS AN ANTAGONIST     

Baker AD  Delong WA 《Science (New York, N.Y.)》1927,66(1715):457-458

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ON THE RETENTION OF A BALL BY A VERTICAL WATER JET     

Baker WC 《Science (New York, N.Y.)》1926,64(1650):161-163

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Evidence for biased gene conversion in concerted evolution of ribosomal DNA   总被引：31，自引：0，他引：31  

D M Hillis  C Moritz  C A Porter  R J Baker 《Science (New York, N.Y.)》1991,251(4991):308-310

Concerted evolution is the production and maintenance of homogeneity within repeated families of DNA. Two mechanisms--unequal crossing over and biased gene conversion--have been the principal explanations of concerted evolution. Concerted evolution of ribosomal DNA (rDNA) arrays is thought to be largely the result of unequal crossing over. However, concerted evolution of rDNA in parthenogenetic lizards of hybrid origin is strongly biased toward one of two parental sequences, which is consistent with biased gene conversion as the operative mechanism. The apparent gene conversions are independent of initial genome dosage and result in homogenization of rDNA arrays across all nucleolar organizer regions.  相似文献