Geographic distribution and environmental risk factors of lymphoma in dogs under primary‐care in the UK     

I. Schofield  K. B. Stevens  C. Pittaway  D. G. O'Neill  D. Fecht  J. M. Dobson  D. C. Brodbelt 《The Journal of small animal practice》2019,60(12):746-754

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An incidental case of tick paralysis in a Holstein calf exposed to Dermacentor andersoni          下载免费PDF全文

Schofield LN  Saunders JR 《The Canadian veterinary journal. La revue veterinaire canadienne》1992,33(3):190-191

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Salmonellosis in Swine: A Field and Laboratory Study of Four Outbreaks 1     

Frank W. Schofield 《Canadian journal of veterinary research》1944,8(10):273-280

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Prevention of Anaemia in Suckling Pigs     

Frank W. Schofield  T. Lloyd Jones 《Canadian journal of veterinary research》1939,3(3):63-66

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Effects of phosphorus fertilizer supplementation on antioxidant enzyme activities in tomato fruits     

Ahn T  Oke M  Schofield A  Paliyath G 《Journal of agricultural and food chemistry》2005,53(5):1539-1545

The effects of soil and foliar phosphorus supplementation on the activities and levels of superoxide dismutase (SOD), guaiacol peroxidase (POX), and ascorbate peroxidase (APX) in tomato fruits were evaluated by determining enzyme activities and isoenzyme analysis. Both protein levels and enzyme activities varied depending on the variety and season. In general, phosphorus supplementation did not alter SOD, POX, and APX activities significantly;however, some treatments showed season- and stage-specific enhancement in activities as noticed with hydrophos and seniphos supplementation. Three different SOD isozymes were observed, and these isozymes showed very similar staining intensities in response to P application and during the three developmental stages studied. Two major isozymes of POX and two different APX isozymes were observed at all the developmental stages. The results suggest that antioxidant enzyme activities may be influenced by the availability of phosphorus, but are subject to considerable variation depending on the developmental stage and the season.  相似文献   

The role of dissolved organic carbon in the chemistry and bioavailability of mercury in remote Adirondack lakes   总被引：1，自引：0，他引：1  

C. T. Driscoll  V. Blette  C. Yan  C. L. Schofield  R. Munson  J. Holsapple 《Water, air, and soil pollution》1995,80(1-4):499-508

A number of recent studies have documented elevated concentrations of mercury (Hg) in fish caught in remote lakes and a pattern of increased concentrations of Hg in fish tissue with decreasing water column pH. Because of the potential linkage between fish Hg and surface water acidification, factors regulating water column concentrations and bioavailability of Hg were investigated in Adirondack lakes through a field study and application of the Mercury Cycling Model (MCM). Concentrations of total Hg and total MeHg were highly variable, with concentrations of total MeHg about 10% of total Hg in lakes which did not show anoxic conditions. In lakes exhibiting anoxic conditions in the hypolimnion during summer stratification, concentrations of total MeHg were elevated. Concentrations of total Hg and total MeHg increased with decreasing pH in remote Adirondack lakes. However, more importantly, concentrations of total Hg and total MeHg increased with increasing concentrations of dissolved organic carbon (DOC) and percent near-shore wetlands in the drainage basin. Mercury concentrations in muscle tissue of yellow perch from Adirondack lakes were elevated above the U.S. FDA action level (1 μg/g Hg) in 7% of the fish sampled or in one or more individual fish from 9 of the 16 lakes sampled. Fish Hg concentrations generally increased with increasing fish length, weight and age. Patterns of increasing Hg concentration with age likely reflect shifts in prey of yellow perch and the bioconcentration of Hg along the food chain. For age 3 to 5 perch, concentrations of Hg increased with increasing concentrations of DOC and percent near-shore wetlands in the drainage basin. However, for a lake with very high DOC concentrations, fish concentrations of Hg declined. Calculations with the MCM also show that concentrations of Hg species increase with increasing DOC due to complexation reactions. Increases in DOC result in increasing concentrations of Hg in biota but decreases in the bioconcentration factor of Hg in fish tissue. This research suggests that DOC is important in the transport of Hg to lake systems. High concentrations of DOC may complex MeHg, diminishing its bioavailability. At high concentrations of monomeric Al, the complexation of MeHg with DOC apparently decreases, enhancing the bioavailability of MeHg.  相似文献   

Incidence and risk factors for feline lymphoma in UK primary-care practice     

L. Economu  A. Stell  D. G. O'Neill  I. Schofield  K. Stevens  D. Brodbelt 《The Journal of small animal practice》2021,62(2):97-106

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Full Open Population Capture–Recapture Models With Individual Covariates     

Matthew R. Schofield  Richard J. Barker 《Journal of Agricultural, Biological & Environmental Statistics》2011,16(2):253-268

Traditional analyses of capture–recapture data are based on likelihood functions that explicitly integrate out all missing data. We use a complete data likelihood (CDL) to show how a wide range of capture–recapture models can be easily fitted using readily available software JAGS/BUGS even when there are individual-specific time-varying covariates. The models we describe extend those that condition on first capture to include abundance parameters, or parameters related to abundance, such as population size, birth rates or lifetime. The use of a CDL means that any missing data, including uncertain individual covariates, can be included in models without the need for customized likelihood functions. This approach also facilitates modeling processes of demographic interest rather than the complexities caused by non-ignorable missing data. We illustrate using two examples, (i) open population modeling in the presence of a censored time-varying individual covariate in a full robust design, and (ii) full open population multi-state modeling in the presence of a partially observed categorical variable. Supplemental materials for this article are available online.  相似文献   

A Laboratory Challenge Method for Estimating Taura Syndrome Virus Resistance in Selected Lines of Pacific White Shrimp Litopenaeus vannamei     

Brenda L.  White  Paul J.  Schofield  Bonnie T.  Poulos Donald V.  Lightner 《Journal of the World Aquaculture Society》2002,33(3):341-348

Among the strategies being developed to improve survival and harvest yields in the farming of Pacific white shrimp Litopenneus vannumei is breeding domesticated family lines and the selection for further development of those lines that demonstrate resistance to Taura syndrome virus (TSV) challenge in the laboratory. A standardized laboratory challenge method for measuring TSV resistance by per os exposure to the virus, relative to a reference stock of L. vannamei , was developed and used to screen a total of 176 family lines provided by five different companies over a period of several months. All challenged shrimp were exposed to TSV per os by feeding minced TSV-positive shrimp carcasses at ∼10% of the shrimp biomass once per day for three consecutive days. Studies were carried out for a minimum of 14 d from the first day (day 0) of exposure to TSV. The survival rates obtained following TSV challenge of the selected L. vannamei families ranged from 0% to 100%, with a mean of 31%. The reference line of L. vannamei ("Kona line") gave survival rates of 0% to 37% with a mean of 13%. The results of the present study demonstrate that the use of a relatively simple laboratory challenge procedure provides a mechanism to evaluate and compare resistance to TSV among selected L. vannamei families and to predict the performance of selected stocks in farm environments where TSV is enzootic.  相似文献   

Aluminum toxicity in forests exposed to acidic deposition: The ALBIOS results     

Christopher S. Cronan  Richard April  Richmond J. Bartlett  Paul R. Bloom  Charles T. Driscoll  Steven A. Gherini  Gray S. Henderson  J. D. Joslin  J. M. Kelly  Roderic A. Parnell  Howard H. Patterson  Dudley J. Raynal  Michail Schaedle  Carl L. Schofield  Edward I. Sucoff  Herbert B. Tepper  Frank C. Thornton 《Water, air, and soil pollution》1989,48(1-2):181-192

The ALBIOS project was conducted to examine the influence of acidic deposition on aluminum transport and toxicity in forested ecosystems of eastern North America and northern Europe. Patterns of aluminum chemistry were evaluated in 14 representative watersheds exposed to different levels of sulfur deposition. Controlled studies with solution and soil culture methods were used to test interspecific differences in aluminum sensitivity for one indicator species (honeylocust - Gleditsia triacanthos L. ) and six commercial tree species (red spruce - Picea rubens Sarg., red oak - Quercus rubra L., sugar maple - Acer saccharum Marsh., American beech - Fagus grandifolia Ehrh., European beech - Fagus sylvatica, and loblolly pine - Pinus Taeda L. ). Overall, red spruce was the tree species whose growth was most sensitive to soluble aluminum, with significant biomass reductions occurring at Al concentrations of approximately 200–250 umol/L. Analyses of soil solutions from the field sites indicated that the conditions for aluminum toxicity for some species exist at some of the study areas. At these watersheds, aluminum toxicity could act as a contributing stress factor affecting forest growth.  相似文献