TRIALS OF SEED DRESSINGS FOR THE CONTROL OF WHEAT BULB FLY IN SCOTLAND     

P. Osborne    W. D. Gill  E. Dunn 《Plant pathology》1964,13(1):19-19

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Infectious bronchitis virus interference with growth of Newcastle disease virus. I. Study of interference in chicken embryos     

L G Raggi  G G Lee 《Avian diseases》1963,7(1):106-122

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STUDIES ON WEED SPECIES OF THE GENUS POLYGONUM L.     

J. L. HAMMERTON 《Weed Research》1965,5(1):13-26

Summary. Seeds of Polygonam persiaria were collected from seven localities during 1962. In 1963 plants of these seven populations were grown in the field and sampled at regular intervals over the period 21st June to 13th August. At all samplings there were differences between populations in total dry weight, in leaf area index and in total nitrogen content, and populations also differed in the date of flowering. The populations also differed significantly in relative growth rate, leaf area ratio, net assimilation rate and relative nitrogen absorption rate. The variations in net assimilation rate did not appear to be closely associated with variations in leaf area index. Certain growth attributes were correlated with the latitude of origin, and it is tentatively suggested that the populations may represent genetically distinct latitudinal ecotypes.
Études sur des espèces de mauvaises herbes du genre Polygonum L.  相似文献   

Water-formed structures: geomorphology and hydrology of karst terrains     

Bloom AL 《Science (New York, N.Y.)》1989,243(4898):1618-1619

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An Entrepreneurial Tree Sprouts in Europe: Although their numbers are small compared to the United States, scientists in Europe are leaving academic research in growing numbers to start new high-tech companies     

Dickson D 《Science (New York, N.Y.)》1989,245(4922):1038-1040

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Giant radiation-induced color halos in quartz: solution to a riddle     

Odom AL  Rink WJ 《Science (New York, N.Y.)》1989,246(4926):107-109

The radii of radiation-induced color halos(RICHs) surrounding radioactive mineral inclusions in mica generally correspond closely to the calculated range of common uranogenic and thorogenic alpha particles in mica. Many exceptions are known, however, and these variants have led investigators to some rather exotic interpretations. Three RICHs found in quartz are identified as aluminum hole-trapping centers. Whereas the inner radii of these RICHs closely match the predicted range of the most energetic common alphas(39 micrometers), the color centers observed extend to 100 micrometers. Migration of valence-band holes down a radiation-induced charge potential might account for enigmatic RICHs. Such RICHs provide natural experiments in ultraslow charge diffusion.  相似文献   

The idea of symmetry: felix klein and sophus lie     

Rowe D 《Science (New York, N.Y.)》1989,246(4932):940-941

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Introduction to the Study of Melofauna. Robert P. Higgins and Hjalmar Thiel, Eds. Smithsonian Institution Press, Washington, DC, 1998. 488 pp., illus. $39.95     

L K 《Science (New York, N.Y.)》1989,243(4896):1376

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Remembering Reconsidered. Ecological and Traditional Approaches to the Study of Memory. Ulric Neisser and Eugene Winograd, Eds. Cambridge University Press, New York, 1988. x, 390 pp., illus. $44.50. Emory Symposia in Cognition, vol. 2. From a conference, Atlanta, GA, Oct. 1985     

Schacter DL 《Science (New York, N.Y.)》1989,243(4896):1375-1376

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Some other books of interest: 100 years exploring life, 1888-1988     

L K 《Science (New York, N.Y.)》1989,245(4915):315

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