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131.
Chandler LD 《Pest management science》2003,59(6-7):605-608
The corn rootworm areawide management program was implemented by USDA-ARS in 1995 at five locations across the USA. This program is based on the use of a semiochemical insecticide bait applied to maize (Zea mays L) during peak adult corn rootworm activity. Managing adult rootworms minimizes the number of eggs laid, resulting in fewer larvae available to economically damage maize roots in the following growing season. To date, rootworm populations have been significantly reduced at all participating locations and new bait products have been developed and evaluated for use in rootworm-infested areas. 相似文献
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A haemolytic enteropathogenic E. coli (WG) and pig rotavirus were isolated from a field case of postweaning diarrhoea in pigs. Four-week-old gnotobiotic piglets fed on milk diet were found to be extremely susceptible to infection with WG E. coli . Piglets were less susceptible to the infection immediately after the diet was changed from milk to dry food, and were almost completely resistant 4 days after the change to dry food. There was no difference in the clinical response to infection with WG E. coli when the piglets were fed either a high energy diet or low energy diet. Four-week-old piglets fed milk showed mild symptoms of diarrhoea when inoculated with pig rotavirus. Symptoms were more severe when piglets were inoculated immediately after the change from milk to dry food. Piglets inoculated 4 days after the change of diet showed no symptoms of diarrhoea at all. Under the conditions of these experiments the enteropathogenic E. col produced a more serious disease than did pig rotavirus. Infection of 4-week-old gnotobiotic piglets with both agents given sequentially produced a diarrhoeal disease that was more severe than that produced by each agent separately. 相似文献
134.
R L Chandler 《The Veterinary record》1969,84(26):671-672
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Acute effects of carprofen and meloxicam on canine gastrointestinal permeability and mucosal absorptive capacity 总被引:1,自引:1,他引:0
Craven M Chandler ML Steiner JM Farhadi A Welsh E Pratschke K Shaw DJ Williams DA 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2007,21(5):917-923
BACKGROUND: Nonsteroidal anti-inflammatory drugs (NSAIDs) are frequently prescribed to dogs for their analgesic, antipyretic, and anti-inflammatory properties. Their beneficial actions can be offset by gastrointestinal (GI) toxicosis. Endoscopy has traditionally been employed to detect GI lesions, but alterations in GI permeability precede the development of mucosal damage. HYPOTHESIS: Carprofen and meloxicam alter GI permeability and mucosal absorptive capacity of dogs. ANIMALS: Twenty adult dogs treated with an NSAID for >7 days were evaluated by permeability tests while receiving either carprofen (10 dogs) or meloxicam (10 dogs). METHODS: Prospective, longitudinal observational study. A 6-sugar permeability test (sucrose, lactulose, rhamnose, 3-O-methyl-D-glucose, D-xylose, and sucralose) was performed on the day before NSAID treatment, and after 3 and 8 days of treatment. RESULTS: There were no significant differences in the urinary recovery ratios of lactulose: rhamnose, D-xylose: 3-O-methyl-D-glucose, or sucralose recovery within either group at any time during the study. Sucrose permeability in the meloxicam group did not alter significantly over time. However, sucrose permeability in the carprofen group decreased significantly by day 3 (P = .049) and increased again by day 8 (P = .049), to a level that was not significantly different to permeability before treatment (P = .695). CONCLUSIONS AND CLINICAL IMPORTANCE: The absence of increased GI permeability and diminished mucosal absorptive capacity in this group of dogs does not support the development of acute GI toxicosis during treatment with either meloxicam or carprofen. 相似文献
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138.
Michael E Scharf Blair D Siegfried Lance J Meinke Laurence D Chandler 《Pest management science》2000,56(9):757-766
Fipronil toxicity and metabolism were studied in two insecticide‐resistant, and one susceptible western corn rootworm (Diabrotica virgifera virgifera, LeConte) populations. Toxicity was evaluated by exposure to surface residues and by topical application. Surface residue bioassays indicated no differences in fipronil susceptibility among the three populations. Topical bioassays were used to study the relative toxicity of fipronil, fipronil + the mono‐oxygenase inhibitor piperonyl butoxide, and fipronil's oxidative sulfone metabolite in two populations (one resistant with elevated mono‐oxygenase activity). Fipronil and fipronil‐sulfone exhibited similar toxicity and application of piperonyl butoxide prior to fipronil resulted in marginal effects on toxicity. Metabolism of [14C]fipronil was evaluated in vivo and in vitro in the three rootworm populations. In vivo studies indicated the dominant pathway in all populations to be formation of the oxidative sulfone metabolite. Much lower quantities of polar metabolites were also identified. In vitro studies were performed using sub‐cellular protein fractions (microsomal and cytosolic), and glutathione‐agarose purified glutathione‐S‐transferase. Oxidative sulfone formation occurred almost exclusively in in vitro microsomal reactions and was increased in the resistant populations. Highly polar metabolites were formed exclusively in in vitro cytosolic reactions. In vitro reactions performed with purified, cytosolic glutathione‐S‐transferase (MW = 27 kDa) did not result in sulfone formation, although three additional polar metabolites not initially detectable in crude cytosolic reactions were detected. Metabolism results indicate both cytochromes P450 and glutathione‐S‐transferases are important to fipronil metabolism in the western corn rootworm and that toxic sulfone formation by P450 does not affect net toxicity. © 2000 Society of Chemical Industry 相似文献
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140.
Marjorie L. Chandler MS DVM W. Grant Guilford BVSC PhD Charles R.O. Lawoko MA MS PhD DIC Ted Whittem BVSc PhD 《Veterinary radiology & ultrasound》1999,40(1):3-8
Reference ranges for gastric emptying time (GET), small intestinal transit time (SITT), and colonic transit time of 1.5-mm and 5-mm radiopaque markers in healthy cats fed a high-fiber meal were determined, and the influence of low-dose diazepam intravenous injection on the gastrointestinal transit of the markers was examined. The mean GETs and SITTs, and the mean residence times (MRTs) and geometric centers (GCs) of markers in the colon were determined. The effect of intravenous diazepam injection and marker size on these parameters was examined. Diazepam injection had no significant influence on gastrointestinal transit. The GETs of the 1.5-mm markers were significantly more rapid than those of the 5.0-mm markers. There were no significant differences between the SITTs or GCs of the 1.5-mm and 5.0-mm markers. Reference values were developed for GET, SITT, and colonic transit of radiopaque markers for cats fed a high-fiber meal. Diazepam injection had no effect on these parameters. 相似文献