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A total of 500 sera and lungs of slaughtered pigs were examined to investigate antibody titer, prevalence of pulmonary lesion, and interrelation among lung lesion score, type of pulmonary lesion and antibody titers by ELISA. The results obtained were as follows; 1. The highest distribution of antibody titer was showed at 20 - 80 in M hyopneumoniae, 160 - 640 in P multocida type A and 160 - 640 in A pleuropneumoniae serotype 2 and 5. 2. The prevalence of pulmonary lesions was 84.0%, mean pulmonary lesion and mean lung score listed as 24.0±19.8% and 2.5± 1.6, respectively. 3. In the prevalence of type of pulmonary lesion, enzootic pneumonia, pleuropneumonia and pleuritis were 58.2%, 10.0% and 15.8%, respectively. 4. Lung lesion score and type of pulmonary lesion were not interrelated with the distribution of antibody titer to specific pathogens, and causative pathogens of respiratory diseases were complicated with various bacteria.
Objectives: This study was designed to establish an accurate analytical method for asbestos in a biological sample for determining occupational asbestos-related diseases and relief of the health effects of environmental asbestos. Methods: Biological samples were obtained from lungs of rats following intratracheal instillation of asbestos(Chrysotile, anthophyllite) and were prepared according to digestion method(Wet digestion, high temperature ashing, low temperature ashing). The samples were then analyzed for asbestos fibers using a transmission electron microscope equipped with an energy dispersive X-ray spectrometer. Results: Low temperature plasma ashing removed more of the organic components and reduced fiber loss compared to the wet digestion method, making specimens so prepared more suitable for transmission electron microsocpy. Conclusions: The low temperature ashing technique is the most accurate method for analyzing asbestos in biological samples.
This study analyzes the essay texts of Chinese students of the Korean language in order to create appropriate measures for instruction of Korean language writing skills. In particular, this study was concerned with whether students who began at advanced levels of Korean language were able to generate “text-like” text. For this study, the meaning of “text-like” text was not only whether the text had cohesion in its form, but also whether it had content coherence .the study, this called “semantic coherence”- and the communicative characteristics of the discourse community. Thus, the students' texts were divided into the levels of sentence, paragraph, and overall essay and were analyzed using the criteria of cohesion from the aspects of both form and content. The results of this study found that while Chinese students' essays overall displayed cohesion from the aspect of form, they were weak in coherence from the aspect of content.