Book review misleading          下载免费PDF全文

Croy BA  Summerlee AJ 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(10):777

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Canine congenital aortic stenosis: A review of the literature and commentary   总被引：2，自引：0，他引：2       下载免费PDF全文

O'grady MR  Holmberg DL  Miller CW  Cockshutt JR 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(10):811-815

Congenital aortic stenosis usually affects the subvalvular region, and occurs mainly in Newfoundland, Golden Retriever, German Shepherd, and Boxer dogs. The disorder is inherited as a dominant trait with variable penetrance in Newfoundland dogs.

The prevalence of subaortic stenosis-like heart murmurs in Golden Retriever dogs appears to be very much greater than previously suspected.

Most cases of aortic stenosis represent mild lesions, are detected as incidental findings, and result in no loss of longevity or quality of life. Moderate or severe stenosis may result in exertional weakness, syncope, or sudden death. Signs of congestive heart failure are rare unless mitral valve insufficiency is present.

Generally, electrocardiography and radiography are unrevealing in this disorder. Doppler echocardiography may be the best diagnostic tool to detect even mild cases of aortic stenosis.

At present, therapy is limited due to the technical expertise and expense required. The prognosis depends on the severity of the lesion.

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Alberta. Salmonella enteritidis from the udder of a cow          下载免费PDF全文

Wood J  Chalmers G  Fenton R  Pritchard J  Schoonderwoerd M 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(10):833

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Effect of ivermectin on weight gains on yearling steers on pasture in central Alberta          下载免费PDF全文

Kennedy MJ  Zobell DR  Goonewardene L 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(4):346-347

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Integration of sapflow velocity in elliptical stems     

Hatton TJ  Greenslade D  Dawes WR 《Tree physiology》1992,11(2):185-196

The estimation of water flux through the stem of a plant by point estimates based on the heat pulse technique requires integration of the velocity profile. The polynomial integration method and the weighted average technique both assume radial symmetry about the bole. A method is introduced that solves the equations for the ellipse in the weighted average technique, and includes an optimizing algorithm for the placement of sensors. The sensitivity of sapflow estimates through stems to increasing eccentricity is examined by means of analytical solutions and simulation. The error in sap flux measurement resulting from the radial approximation of the sapwood conducting area is expressed analytically and shown to be small over the range of eccentricities (e < 0.8) expected in nature. Simulations where radial symmetry is assumed for elliptical stems show substantial error in mean velocity (and thus flux) with modest eccentricities (e > 0.4).  相似文献   

Sm-Nd Isotopic Data and Earth's Evolution     

Moorbath S  Whitehouse MJ 《Science (New York, N.Y.)》1996,273(5283):1878a

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Response: late permian extinctions     

Wignall PB  Twitchett RJ 《Science (New York, N.Y.)》1996,274(5292):1551b-1552b

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Faunal evidence and sterkfontein member 2 foot bones of early hominid     

McKee JK 《Science (New York, N.Y.)》1996,271(5253):1301a

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Publicizing the value of basic research     

Birman JL 《Science (New York, N.Y.)》1996,271(5249):580b

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Response: programmed cell death     

Ameisen JC 《Science (New York, N.Y.)》1996,274(5284):20c-21c

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