Science and Empire-West Coast Fever in Rhodesia and the Transvaal          下载免费PDF全文

John F. Prescott 《The Canadian veterinary journal. La revue veterinaire canadienne》1992,33(9):620-621

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Experiments with Cyperus rotundus L. III. Seasonal variations in growth   总被引：1，自引：0，他引：1  

John L.  Hammeron 《Weed Research》1975,15(5):339-348

Nutgrass tubers were planted in pots on thirteen occasions at 4-weekly intervals, and growth and development followed by sampling at 5-day intervals from 10 to 45 days after planting. Growth rates, final shoot numbers, dry weights and rhizome lengths, and new tuber production were highest in plantings made 1 and 29 March and 26 April. Correlation coefficients suggested that mean daylength during growth was a major factor influencing growth and development, but mean temperature appeared to be important in determining new tuber size and the proportion of dry-matter as new tubers. Shoot number appears to be a reliable guide to rhizome and tuber production.  相似文献   

Tetanus in the Horse: A Review of 20 Cases (1970 to 1990)     

Sherril L. Green  Christopher B. Little  John D. Baird  Robert R. M. Tremblay  Laura L. Smith-Maxie 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1994,8(2):128-132

The case records of 20 horses with tetanus referred to the Ontario Veterinary College-Veterinary Teaching Hospital between 1970 and 1990 were reviewed. The fatality rate was 75%. There was a strong association with previous vaccination and survival ( P = .03). Most of the animals had been injured an average of 9 days (range 2 to 21 days) prior to development of clinical signs. Hyperesthesia and prolapse of the third eyelid were the most common clinical signs. Treatment regimens varied during hospitalization; however, all horses received parenteral penicillin, tranquilizers, tetanus toxoid, and antitoxin. Five of the nonsurviving animals were given intrathecal tetanus antitoxin. One animal had seizures as a complication of intrathecal treatment. The prognosis was best for horses that (1) had been vaccinated prior to the injury, (2) responded to the phenothiazine tranquilizers, and (3) did not rapidly (over 24 to 48 hours) become recumbent. Considering the species susceptibility, potential for contaminated wounds, and the increased survival of vaccinated horses, yearly revaccination is recommended.  相似文献   

钾、磷与肉种鸡猝死综合症     

John Portsmouth  吴孝兵  强莉 《中国畜牧兽医》2002,29(3):44-45

现代肉种鸡生产中 ,为预防猝死综合症( Sudden death syndrom,SDS)所需要的磷与钾量远高于其他生产过程所需量。建议 2 0～ 2 8周龄肉种鸡日粮至少应含钾 0 .65 % ,可消化磷0 .40 %。在过去 1年中 ,许多营养学家就肉种鸡的磷需要量作过综述。 Reddy( 2 0 0 1 )指出 ,0 .1 %的非植酸磷能保持肉种鸡最大生产性能和种蛋最大孵化率 ,而要维持最大骨骼强度 ,这个数字应为0 .2 %或 0 .3%。Wilson建议用非植酸磷代替植酸磷。 SDS多发于成年肉种鸡群中 ,尤其是那些大型肉种鸡品系 ,目前 ,大型肉种鸡约占世界肉鸡市场的 5 0 %。 SDS在 2 0世纪 8…  相似文献   

Mitral Stenosis in 15 Dogs     

Linda B. Lehmkuhl  Wendy A. Ware  John D. Bonagura 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1994,8(1):2-17

Mitral stenosis was diagnosed in 15 young to middle-aged dogs. There were 5 Newfoundlands and 4 bull terriers affected, suggesting a breed predisposition for this disorder. Clinical signs included cough, dyspnea, exercise intolerance, and syncope. Soft left apical diastolic murmurs were heard only in 4 dogs, whereas 8 dogs had systolic murmurs characteristic of mitral regurgitation. Left atrial enlargement was the most prominent radiographic feature. Left-sided congestive heart failure was detected by radiographs in 11 dogs within 1 year of diagnosis. Electrocardiographic abnormalities varied among dogs and included atrial and ventricular enlargement, as well as atrial and ventricular arrhythmias. Abnormalities on M-mode and two-dimensional echocardiograms included abnormal diastolic motion of the mitral valve characterized by decreased leaflet separation, valve doming, concordant motion of the parietal mitral valve leaflet, and a decreased E-to-F slope. Increased mitral valve inflow velocities and prolonged pressure half-times were detected by Doppler echocardiography. Cardiac catheterization, performed in 8 dogs, documented a diastolic pressure gradient between the left atrial, pulmonary capillary wedge, or pulmonary artery diastolic pressures and the left ventricular diastolic pressure. Necropsy showed mitral stenosis caused by thickened, fused mitral valve leaflets in 5 dogs and a supramitral ring in another dog. The outcome in affected dogs was poor; 9 of 15 dogs were euthanatized or died by 2 1/2 years of age.  相似文献   

Development of a computerized systems model for health management decision support in growing hogs     

James W. Lloyd  Stephen B. Harsh  John B. Kaneene  Gerald D. Schwab  Brad J. Thacker  Andrew J. Thulin 《Preventive veterinary medicine》1994,19(3-4):249-265

A study was designed to provide decision support for health management in growing hogs. A dynamic, stochastic systems model for a confinement, continuous production hog growing enterprise (including nursery, grower and finisher phases) was developed to simulate the economic effects of disease, available floor space and feed additives using farm- specific data. Modeling techniques included: discrete and distributed (continuous) delays; triangular probability density functions; autocorrelation; table look-up functions; an alpha-beta tracker; non-linear, constrained optimization. The model was designed to be initialized with the system's current status, using an accompanying production/financial database to achieve individual-farm specificity. Initialization of rate variables required ‘reverse optimization’ of historical system performance. Model predictions are based on an adjustment approach, where changes in current performance are dictated by changes in disease rates, available floor space and feed additive use. These effects vary randomly, but are autocorrelated between production phases, between similar diseases and over time.  相似文献   

Turbidity in the aquatic environment: Charles G. Wilber. Charles C. Thomas Publisher,Springfield, IL, 1983. ix + 133 pp., US $18.75, ISBN 0-398-04726-X     

John Colt 《Aquaculture (Amsterdam, Netherlands)》1984,37(3):291-292

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Chemical investigation and authenticity of Indian vanilla beans     

John TV  Jamin E 《Journal of agricultural and food chemistry》2004,52(25):7644-7650

Representative and validated samples taken from a 500 acre vanilla (Vanilla planifolia Andrews) plantation in India have shown significant deviations in aromatic profile, especially the relative amounts of vanillin (high) and p-hydroxybenzaldehyde (low) and the deuterium isotopic (SNIF-NMR) values. However, the carbon isotopic values (carbon 13 profiles) were generally in accordance with the previous findings on vanilla from other geographic origins.  相似文献   

Green-light supplementation for enhanced lettuce growth under red- and blue-light-emitting diodes   总被引：9，自引：0，他引：9  

Kim HH  Goins GD  Wheeler RM  Sager JC 《HortScience : a publication of the American Society for Horticultural Science》2004,39(7):1617-1622

Plants will be an important component of future long-term space missions. Lighting systems for growing plants will need to be lightweight, reliable, and durable, and light-emitting diodes (LEDs) have these characteristics. Previous studies demonstrated that the combination of red and blue light was an effective light source for several crops. Yet the appearance of plants under red and blue lighting is purplish gray making visual assessment of any problems difficult. The addition of green light would make the plant leave appear green and normal similar to a natural setting under white light and may also offer a psychological benefit to the crew. Green supplemental lighting could also offer benefits, since green light can better penetrate the plant canopy and potentially increase plant growth by increasing photosynthesis from the leaves in the lower canopy. In this study, four light sources were tested: 1) red and blue LEDs (RB), 2) red and blue LEDs with green fluorescent lamps (RGB), 3) green fluorescent lamps (GF), and 4) cool-white fluorescent lamps (CWF), that provided 0%, 24%, 86%, and 51% of the total PPF in the green region of the spectrum, respectively. The addition of 24% green light (500 to 600 nm) to red and blue LEDs (RGB treatment) enhanced plant growth. The RGB treatment plants produced more biomass than the plants grown under the cool-white fluorescent lamps (CWF treatment), a commonly tested light source used as a broad-spectrum control.  相似文献   

Evidence for occurrence of an organophosphate-resistant type of acetylcholinesterase in strains of sea lice (Lepeophtheirus salmonis Krøyer)     

Fallang A  Ramsay JM  Sevatdal S  Burka JF  Jewess P  Hammell KL  Horsberg TE 《Pest management science》2004,60(12):1163-1170

Acetylcholinesterase (AChE) is the target of a major pesticide family, the organophosphates, which were extensively used as control agents of sea lice on farmed salmonids in the early 1990s. From the mid‐1990s the organophosphates dichlorvos and azamethiphos were seriously compromised by the development of resistance. AChE insensitive to organophosphate chemotherapeutants has been identified as a major resistance mechanism in numerous arthropod species, and in this study, target‐site resistance was confirmed in the crustacean Lepeophtheirus salmonis Krøyer isolated from several fish‐farming areas in Norway and Canada. A bimolecular rate assay demonstrated the presence of two AChE enzymes with different sensitivities towards azamethiphos, one that was rapidly inactivated and one that was very slowly inactivated. To our knowledge this is the first report of target‐site resistance towards organophosphates in a third class of arthropods, the Crustacea. Copyright © 2004 Society of Chemical Industry  相似文献