The long term benefits of manuring grassland with animal wastes     

R.S. Shiel 《Soil Use and Management》1995,11(3):148-149

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Transforming genes: oncogenes, genes, and growth factors     

Ihle JN 《Science (New York, N.Y.)》1987,237(4818):1060-1061

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Seasonal mixing and catastrophic degassing in tropical lakes, cameroon, west Africa     

Kling GW 《Science (New York, N.Y.)》1987,237(4818):1022-1024

Lethal gas releases from Lakes Nyos and Monoun in Cameroon seem to be more lacustrine than volcanic in origin. Both of these events occurred in August and were only 2 years apart. Data show that the period of deepest mixing and lake turnover also occurs during late summer in this region of tropical Africa. In addition, recent trends of decreases in both air temperatures and effective insolation relative to long-term means suggest that weakening of stratification, coupled with a predictable seasonal interval of reduced stability in August, may be responsible for the timing of these events.  相似文献   

Radiaton Damage: Early Assessments: The Dragon's Tail     

Mazuzan GT 《Science (New York, N.Y.)》1987,236(4804):979-980

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Behavioral ecology: ecological aspects of social evolution     

Austad SN 《Science (New York, N.Y.)》1987,236(4800):470

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The mind-body problem: neurophilosophy     

Stent GS 《Science (New York, N.Y.)》1987,236(4804):990-992

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Growth and the composition and transport of carbohydrate in compatible and incompatible peach/plum grafts     

Moing A  Salesses G  Saglio PH 《Tree physiology》1987,3(4):345-354

The growth of scions and rootstocks of compatible (Prunus persica L. Batsch cv. Springtime/Prunus cerasifera L. Ehrh. cv. myrobolan P2032) and incompatible (Prunus persica L. Batsch cv. Springtime/Prunus cerasifera L. Ehrh. cv. myrobolan P18) peach/plum grafts were compared. The composition of soluble carbohydrates in phloem and cortical tissues of both peach/plum grafts and ungrafted plums and the translocation of these compounds across the union of grafted plants were examined. Sorbitol and sucrose were the dominant sugars in the phloem and cortical tissues of plum. A cyanogenic glycoside, prunasin, was present in peach tissues in amounts equivalent to those of sorbitol or sucrose, whereas only small amounts of prunasin were detected in plum tissues. The concentration of prunasin was significantly higher in the phloem of the P18 rootstock of the incompatible graft. Sorbitol was the only sugar significantly depleted in rootstock tissues of the incompatible graft when the first foliar symptoms of graft incompatibility became evident. Translocation studies with 1-(14)C-deoxyglucose showed that the relative distribution of radioactivity across the graft union was similar in both compatible and incompatible grafts. However, the total amount of radioactivity translocated across the incompatible graft was less than one-third of that translocated across the compatible graft. The results are consistent with the hypothesis of a progressive poisoning of the root system in the incompatible graft by a compound synthesized in peach foliage. The role of prunasin as a possible candidate is discussed.  相似文献   

Mycotic endometritis in mares. Review and clinical observations     

Blue MG 《New Zealand veterinary journal》1987,35(11):181-183

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The nuclear threat and veterinarians' responsibilities     

Mackintosh CG  Alley MR 《New Zealand veterinary journal》1987,35(1-2):14

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Solar neutrinos: questions and hypotheses     

Weneser J  Friedlander G 《Science (New York, N.Y.)》1987,235(4790):755-759

The "solar neutrino puzzle" has been a challenge for almost 20 years, posing broad and fundamental questions about astrophysics and neutrino properties. This article sketches some of the ideas that have been put forward to solve the problem. These ideas can be grouped into two main classes: those involving changes in the standard solar model or in the basic nuclear reaction data, and those that attribute the puzzle to as yet unobserved properties of the neutrinos.  相似文献