An encrusted cystitis caused by Corynebacterium urealyticum in a dog     

A. GOMEZ  C. NOMBELA  J. ZAPARDIEL  F. SORIANO 《Australian veterinary journal》1995,72(2):72-73

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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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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   

Hopes and Fears at NSF     

W J 《Science (New York, N.Y.)》1987,237(4818):970

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What Is Worse Than "The Big One"?: A great earthquake on the San Andreas may be inevitable, but a quake 1/30 as powerful within the Los Angeles basin could wreak greater damage     

Kerr RA 《Science (New York, N.Y.)》1987,238(4825):269-270

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Measurement scales on the continuum     

Luce RD  Narens L 《Science (New York, N.Y.)》1987,236(4808):1527-1532

In a seminal article in 1946, S. S. Stevens noted that the numerical measures then in common use exhibited three admissible groups of transformations: similarity, affine, and monotonic. Until recently, it was unclear what other scale types are possible. For situations on the continuum that are homogeneous (that is, objects are not distinguishable by their properties), the possibilities are essentially these three plus another type lying between the first two. These types lead to clearly described classes of structures that can, in principle, be incorporated into the classical structure of physical units. Such results, along with characterizations of important special cases, are potentially useful in the behavioral and social sciences.  相似文献   

Electromagnetic stabilization of weakly conducting fluids     

Ivory CF  Gobie WA  Beckwith JB  Hergenrother R  Malec M 《Science (New York, N.Y.)》1987,238(4823):58-61

Classical hydromagnetic theory predicts that the flow of dilute aqueous electrolyte in a slit can be stabilized by application of a strong, transverse magnetic field. However, recent experiments indicate that stabilization can be achieved with the use of a much weaker field in the presence of a small lateral current. A revised theory describes how the magnetic and electric fields interact to eliminate natural convection.  相似文献   

Induced resistance and interspecific competition between spider mites and a vascular wilt fungus     

Karban R  Adamchak R  Schnathorst WC 《Science (New York, N.Y.)》1987,235(4789):678-680

The fungal pathogen Verticillium dabliae was less likely to cause symptoms of verticillium wilt on cotton seedlings that had been previously exposed to spider mites than on unexposed cotton seedlings. Conversely, populations of the spider mite Tetranychus urticae grew less rapidly on seedlings that had been inoculated with V. dabliae than on uninoculated controls. Changes caused by pathogen or herbivore attack reduced the suitability of the host plant to a diversity of organisms. This result suggests that highly unrelated organisms that share a host plant may interact strongly.  相似文献   

Retraction of research findings     

Lindberg DA 《Science (New York, N.Y.)》1987,235(4794):1308b

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Variation in water relations of black spruce stock types planted in Ontario     

Blake TJ  Sutton RF 《Tree physiology》1987,3(4):331-344

Upland, intermediate and lowland sites in northeastern Ontario were planted between May 28 and June 8 with three types of black spruce (Picea mariana (Mill.) BSP) nursery stock: (1) spring-lifted, 1.5 + 1.5 bareroot plants (BR); (2) 24-week-old, winter-sown, container stock (CWS); and (3) spring-sown, overwintered, container stock (CO). At the beginning of the growing season, the BR stock had the lowest xylem pressure potentials (Psi(x)), stomatal conductances (g(wv)), and net photosynthetic (P(n)) rates. By the end of the growing season, the BR stock still had lower g(wv)s than the container stock types, but had higher shoot Psi(x) values. In August, the turgor loss points for the BR, CO and CWS stock types were -2.8, -1.93 and -1.6 MPa, respectively, while the minimum observed shoot Psi(x) values were -1.4, -1.7 and -1.9 MPa, respectively. The BR stock produced the greatest dry weight of new shoots and unsuberized roots. No new shoots were produced by the CWS stock, but they produced a greater dry weight of unsuberized roots than the CO stock. As a percent of the dry weight of suberized roots, the greatest production of unsuberized roots was by the CWS stock, the least by the BR trees.  相似文献