A Field Trial of a Pilated Moraxella bovis Bacterin for the Prevention of Infectious Bovine Keratoconjunctivitis          下载免费PDF全文

Bateman KG  Leslie KE  Scholl TP 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(1):23-27

Two field trials were conducted to evaluate the efficacy of a Moraxella bovis bacterin in the control of infectious bovine keratoconjunctivitis. The bacterin did not affect the incidence of infectious bovine keratoconjunctivitis in either trial but did appear to reduce the severity of lesions, treatments required and withdrawals from pasture required in one trial. Possible reasons for the apparently contradictory results are offered. It is suggested that the bacterin may be of some value when used in conjunction with other preventive measures.  相似文献   

Tenuous structures from disorderly growth processes     

Witten TA  Cates ME 《Science (New York, N.Y.)》1986,232(4758):1607-1612

Colloidal aggregation and other random growth processes produce structures that behave differently from ordinary bulk matter. Much of this behavior can be described in terms of the invariance of the aggregates under changes of spatial length scale: they appear to be fractals. There are two types of basic mechanisms for producing fractal aggregates. Those in which aggregation proceeds cluster by cluster can be understood qualitatively in terms of a solvable schematic model. The diffusion-limited aggregation or deposition of individual particles to make a large cluster is not as well understood. It is closely related to several irreversible processes in other areas of physics, such as two-fluid displacement in porous materials and the dielectric breakdown of insulators. More generally, disorderly growth mechanisms provide structures having unique properties, many of which can be understood by using simple statistical principles.  相似文献   

Oil Industry R&D Takes a Fall: Exxon's corporate research operation cut in half as oil companies "downsize" to adjust to market     

Walsh J 《Science (New York, N.Y.)》1986,232(4758):1593-1594

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Midgetman Missile Plans Generate Political Debate: A new ICBM has been designed for use as a strategic reserve, although the Pentagon may not intend to use it that way     

Smith RJ 《Science (New York, N.Y.)》1986,232(4755):1186-1188

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Chalk Leaves AAAS, Frankel to Head CSFR Staff     

Wrather J 《Science (New York, N.Y.)》1986,233(4759):112

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Panel sees decline in undergraduate education     

Walsh J 《Science (New York, N.Y.)》1986,232(4747):153

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Koshland: the first year     

Wrather J 《Science (New York, N.Y.)》1986,231(4733):60

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The creation of a technique: the beginnings of electron microscopy     

Cowley JM 《Science (New York, N.Y.)》1986,231(4733):63

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Animal behavior: experimental behavioral ecology and sociobiology     

West-Eberhard MJ 《Science (New York, N.Y.)》1986,231(4733):64-65

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Thiokol had three concerns about shuttle launch     

Smith RJ 《Science (New York, N.Y.)》1986,231(4742):1064

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