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An outbreak of chronic cryptosporidiosis resulting in hypertrophic gastritis occurred in a captive colony of Australian elapid snakes. Two species of the genus Notechiswere involved: Notechis ***ater(Black Tiger Snake) and Notechis scutatus (Eastern or Mainland Tiger Snake). The infection was eventually fatal in all 9 affected snakes. Typical histopathological findings of the stomach included mucosal thickening with cystic dilatation of gastric glands, moderate oedema and fibrosis of the lamina propria, and a mild to moderate patchy infiltration of inflammatory cells. Procedures implemented to contain the outbreak included the use of a formaldehyde-based disinfectant, prompt removal of faecal matter, uneaten and regurgitated food from enclosures, and examination of faecal specimens for Cryptosporidium oocysts and other pathogens. 相似文献
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Masterson J 《Science (New York, N.Y.)》1994,264(5157):421-424
Three published estimates of the frequency of polyploidy in angiosperms (30 to 35 percent, 47 percent, and 70 to 80 percent) were tested by estimating the genome size of extinct woody angiosperms with the use of fossil guard cell size as a proxy for cellular DNA content. The inferred chromosome numbers of these extinct species suggest that seven to nine is the primitive haploid chromosome number of angiosperms and that most angiosperms (approximately 70 percent) have polyploidy in their history. 相似文献
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Masterson MA Welker B Midla LT Meiring RW Hoblet KH 《Journal of veterinary medical education》2004,31(4):380-383
While many other veterinary schools have moved away from a traditional university-based ambulatory practice, the Ohio State University's Large Animal Practice has continued to provide a cost-effective and valuable method of preparing students for today's careers in veterinary medicine. The practice provides a full array of services to production, equine, and camelid clients, including herd health, individual animal medicine and surgery, and emergency services. Acquiring established practices from alumni has formed the client base. Four full-time veterinarians operate the clinic. While these same clinicians do some classroom teaching, their primary responsibility is devoted to the five to six fourth-year veterinary students who rotate through the clinic every two weeks. Teaching methods and objectives for these students include case discussions, homework, truck quiz books, and practice management issues. Financially, the clinic runs as a private practice, with minimal support from the college (201,000 US dollars per fiscal year) and a gross income of 676,000 US dollars per year. Thus, in a cost-effective manner, this required core ambulatory rotation provides students with a scientific learning experience that exposes them to all aspects of large animal production medicine in a real-world setting. 相似文献
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Kaufman AJ Johnston DT Farquhar J Masterson AL Lyons TW Bates S Anbar AD Arnold GL Garvin J Buick R 《Science (New York, N.Y.)》2007,317(5846):1900-1903
High-resolution geochemical analyses of organic-rich shale and carbonate through the 2500 million-year-old Mount McRae Shale in the Hamersley Basin of northwestern Australia record changes in both the oxidation state of the surface ocean and the atmospheric composition. The Mount McRae record of sulfur isotopes captures the widespread and possibly permanent activation of the oxidative sulfur cycle for perhaps the first time in Earth's history. The correlation of the time-series sulfur isotope signals in northwestern Australia with equivalent strata from South Africa suggests that changes in the exogenic sulfur cycle recorded in marine sediments were global in scope and were linked to atmospheric evolution. The data suggest that oxygenation of the surface ocean preceded pervasive and persistent atmospheric oxygenation by 50 million years or more. 相似文献
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