The influence of transient phenomena on the biodegradation of nitrilotriacetic acid in the activated sludge process I: Variations in hydraulic loading and sewage strength     

M. Hunter  T. Stephenson  J. N. Lester  R. Perry 《Water, air, and soil pollution》1985,25(4):415-430

The removal of nitrilotriacetic acid (NTA) following acclimatization in an activated sludge pilot plant has been studied during transient changes in operating conditions. These changes included increases in hydraulic loading and influent chemical oxygen demand (COD) and such phenomena in combination with transient temperature reductions. Short-term increases in hydraulic loading from 1 to 2 dry weather flow (dwf) had a very limited effect on NTA removal. Increasing the influent COD had a slight effect on NTA removal. Short term increases in hydraulic loading combined with transient reductions in temperature significantly reduced NTA removal. The effect of these combined changes on NTA removal was synergistic, rather than additive. Increases in influent COD combined with transient temperature reductions also caused a significant reduction of NTA removal. The effect of such combined changes on NTA removal was at most only additive.  相似文献   

Dietary patterns in middle-aged Irish men and women defined by cluster analysis   总被引：1，自引：0，他引：1  

Villegas R  Salim A  Collins MM  Flynn A  Perry IJ 《Public health nutrition》2004,7(8):1017-1024

OBJECTIVES: To identify and characterise dietary patterns in a middle-aged Irish population sample and study associations between these patterns, sociodemographic and anthropometric variables and major risk factors for cardiovascular disease. DESIGN: A cross-sectional study. SUBJECTS AND METHODS: A group of 1473 men and women were sampled from 17 general practice lists in the South of Ireland. A total of 1018 attended for screening, with a response rate of 69%. Participants completed a detailed health and lifestyle questionnaire and provided a fasting blood sample for glucose, lipids and homocysteine. Dietary intake was assessed using a standard food-frequency questionnaire adapted for use in the Irish population. The food-frequency questionnaire was a modification of that used in the UK arm of the European Prospective Investigation into Cancer study, which was based on that used in the US Nurses' Health Study. Dietary patterns were assessed primarily by K-means cluster analysis, following initial principal components analysis to identify the seeds. RESULTS: Three dietary patterns were identified. These clusters corresponded to a traditional Irish diet, a prudent diet and a diet characterised by high consumption of alcoholic drinks and convenience foods. Cluster 1 (Traditional Diet) had the highest intakes of saturated fat (SFA), monounsaturated fat (MUFA) and percentage of total energy from fat, and the lowest polyunsaturated fat (PUFA) intake and ratio of polyunsaturated to saturated fat (P:S). Cluster 2 (Prudent Diet) was characterised by significantly higher intakes of fibre, PUFA, P:S ratio and antioxidant vitamins (vitamins C and E), and lower intakes of total fat, MUFA, SFA and cholesterol. Cluster 3 (Alcohol & Convenience Foods) had the highest intakes of alcohol, protein, cholesterol, vitamin B(12), vitamin B(6), folate, iron, phosphorus, selenium and zinc, and the lowest intakes of PUFA, vitamin A and antioxidant vitamins (vitamins C and E). There were significant differences between clusters in gender distribution, smoking status, physical activity, body mass index, waist circumference and serum homocysteine concentrations. CONCLUSION: In this general population sample, cluster analysis methods yielded two major dietary patterns: prudent and traditional. The prudent dietary pattern is associated with other health-seeking behaviours. Study of dietary patterns will help elucidate links between diet and disease and contribute to the development of healthy eating guidelines for health promotion.  相似文献   

Enterocolitis caused by Ehrlichia sp. in the horse (Potomac horse fever)   总被引：3，自引：0，他引：3  

D O Cordes  B D Perry  Y Rikihisa  W R Chickering 《Veterinary pathology》1986,23(4):471-477

Potomac horse fever was reproduced in 15 ponies by transfusion of whole blood originally from two natural cases and subsequently from ponies infected by the transfusions. Incubation periods varied from 9 to 15 days. Affected ponies developed varying degrees of fever, diarrhea, anorexia, depression, and leukopenia. Eleven affected ponies were killed, three died in the acute phase of the disease, and one did not show clinical signs. The most consistent post-mortem findings were fluid contents in the cecum and large colon, and areas of hyperemia (of inconstant degree and distribution) in mucosae of both small and large intestines. Multifocal areas of necrosis occurred in mucous membranes. Ehrlichial organisms were most common in the cytoplasm of epithelial cells, macrophages, and mast cells of the large colon.  相似文献   

Serological study of ovine toxoplasmosis in Colombia: epidemiological study of a field outbreak.     

B D Perry  J D Mogollon  A S Grieve  A L de Galvis 《The Veterinary record》1979,104(11):231-234

A serological study, using the indirect haemagglutination test, of an outbreak of toxoplasmosis in a flock of blackface sheep is described. The serological aspects of the disease are discussed with reference to this incident, and possible sources of infection are suggested.  相似文献   

Role of blackflies in the epidemiology of Potomac horse fever     

N E Hahn  B D Perry  R M Rice  J W Hansen  E C Turner 《The Veterinary record》1989,125(10):273-274

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Erosion of incisors in cattle on self-fed silage with enzyme additive.     

A J Smith  A Millward  H Perry  A C Bygrave  J C Granger 《The Veterinary record》1992,130(16):352-353

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Relationship of blood serum selenium levels of pregnant cows to low dietary intake, and effect on tissue selenium levels of their calves     

T W Perry  R C Peterson  D D Griffin  W M Beeson 《Journal of animal science》1978,46(2):562-565

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Seedling growth and mycorrhizal formation in clearcut and adjacent,undisturbed soils in montana: A green-house bioassay     

D.A. Perry  M.M. Meyer  D. Egeland  S.L. Rose  D. Pilz 《Forest Ecology and Management》1982,4(3):261-273

In a series of greenhouse bioassays, tree seedling growth and root-tip development were compared among soils from two areas that had been clearcut and site prepared 16 years earlier and adjacent, undisturbed forest. Seedlings grown in soil from logged areas were shorter and had fewer root tips than those grown in undisturbed forest soil; however, effects on seedling weights were not consistent among species or experimental series. Fertilizing with nitrogen eliminated size differences due to soil source. In Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco], the only species tested in sterilized soils, sterilization of logged soils resulted in increased seedling size and root-tip formation, whereas sterilization of unlogged soils had either no or a negative effect.  相似文献   

Expanded or heat-processed fractions of corn and their relative ability to elicit esophagogastric ulcers in swine     

A J Nuwer  T W Perry  R A Pickett  T M Curtin 《Journal of animal science》1967,26(3):518-525

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Influence of controlled ambient temperatures and diets on the incidence of esophagogastric ulcers in swine     

J T Riker  T W Perry  R A Pickett  C J Heidenreich  T M Curtin 《Journal of animal science》1967,26(4):736-740

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