为保证制苗所用毒种质量和稳定性,在对制苗毒种病毒含量、病毒纯净性、特异性、免疫原性及扩繁代次等研究的基础上,建立了鹅细小病毒灭活疫苗毒种种子批。试验使用鹅胚对鹅细小病毒YA98株进行了20次传代。传代毒种的鉴定结果表明：抽检...为保证制苗所用毒种质量和稳定性,在对制苗毒种病毒含量、病毒纯净性、特异性、免疫原性及扩繁代次等研究的基础上,建立了鹅细小病毒灭活疫苗毒种种子批。试验使用鹅胚对鹅细小病毒YA98株进行了20次传代。传代毒种的鉴定结果表明：抽检的各代次的毒种均无细菌、支原体、外源病毒污染,且病毒含量检测稳定,每0.3 m L含104.78～4.85ELD50;各代次特异性检测均能被鹅细小病毒抗血清中和;将各代次病毒液制成灭活疫苗,免疫成鹅后均能产生完全保护。以此为依据,最终确定原始毒种和基础毒种的扩繁代次宜控制在5代以内,生产毒种的最高扩繁代次宜控制在15代以内。种子批的建立,为鹅细小病毒灭活疫苗的生产奠定了基础。展开更多
Through Analytic Hierarchy Process (AHP),landscape in college campus had been studied from three aspects which were humanization,communication atmosphere and visual effect of plant disposition.By taking the first and ...Through Analytic Hierarchy Process (AHP),landscape in college campus had been studied from three aspects which were humanization,communication atmosphere and visual effect of plant disposition.By taking the first and second campus of Sichuan Agricultural University (Ya'an) for example,their landscape qualities had been analyzed and compared.It had established AHP model of college campus landscape quality,designed questionnaire according to relevant established indexes and relation between indexes,and then launched questionnaire survey.After data statistics and chart analysis,based on survey of actual environment,it had obtained advantages and disadvantages of the first and second campus of Sichuan Agricultural University in terms of landscape quality,and studied landscape quality evaluation,so as to provide reference for college campus landscape design that could create appropriate communication environment and cater to psychological and behavior need of college students.展开更多
By using SWOT Analysis, the internal strengths and weakness, and the external opportunities and challenges of Taohua Mountain Ecotourism Agricultural Park were discussed. The result showed that Taohua Mountain was uni...By using SWOT Analysis, the internal strengths and weakness, and the external opportunities and challenges of Taohua Mountain Ecotourism Agricultural Park were discussed. The result showed that Taohua Mountain was unique in scenery, rich in rural tourism resources and broad in market prospect. However, the tourism products were monotonous, lack of characteristics and depth; the ecological environment was weak; the tourism staff was with low quality; some parts of the area were in poor sanitary condition, restrained by season and periodicity. Meanwhile, there existed some opportunities and challenges in this park. The opportunities mainly contained policy opportunity and transference of tourists’ preference. The challenges primarily included challenges from urban tourism spots of Ya’an City and surrounding cities, and threats of sustainable use of tourism resources resulting from blind exploitation of fruit production area. And the corresponding development countermeasures were put forward, that is, to develop diversified tourism programs, to allocate mountainous resources according to local conditions, to train the local tourism staff, to dredge the area with poor sanitation, to diversify business with other industries supporting the development of tourism agriculture.展开更多
文摘为保证制苗所用毒种质量和稳定性,在对制苗毒种病毒含量、病毒纯净性、特异性、免疫原性及扩繁代次等研究的基础上,建立了鹅细小病毒灭活疫苗毒种种子批。试验使用鹅胚对鹅细小病毒YA98株进行了20次传代。传代毒种的鉴定结果表明：抽检的各代次的毒种均无细菌、支原体、外源病毒污染,且病毒含量检测稳定,每0.3 m L含104.78～4.85ELD50;各代次特异性检测均能被鹅细小病毒抗血清中和;将各代次病毒液制成灭活疫苗,免疫成鹅后均能产生完全保护。以此为依据,最终确定原始毒种和基础毒种的扩繁代次宜控制在5代以内,生产毒种的最高扩繁代次宜控制在15代以内。种子批的建立,为鹅细小病毒灭活疫苗的生产奠定了基础。
文摘Through Analytic Hierarchy Process (AHP),landscape in college campus had been studied from three aspects which were humanization,communication atmosphere and visual effect of plant disposition.By taking the first and second campus of Sichuan Agricultural University (Ya'an) for example,their landscape qualities had been analyzed and compared.It had established AHP model of college campus landscape quality,designed questionnaire according to relevant established indexes and relation between indexes,and then launched questionnaire survey.After data statistics and chart analysis,based on survey of actual environment,it had obtained advantages and disadvantages of the first and second campus of Sichuan Agricultural University in terms of landscape quality,and studied landscape quality evaluation,so as to provide reference for college campus landscape design that could create appropriate communication environment and cater to psychological and behavior need of college students.
文摘By using SWOT Analysis, the internal strengths and weakness, and the external opportunities and challenges of Taohua Mountain Ecotourism Agricultural Park were discussed. The result showed that Taohua Mountain was unique in scenery, rich in rural tourism resources and broad in market prospect. However, the tourism products were monotonous, lack of characteristics and depth; the ecological environment was weak; the tourism staff was with low quality; some parts of the area were in poor sanitary condition, restrained by season and periodicity. Meanwhile, there existed some opportunities and challenges in this park. The opportunities mainly contained policy opportunity and transference of tourists’ preference. The challenges primarily included challenges from urban tourism spots of Ya’an City and surrounding cities, and threats of sustainable use of tourism resources resulting from blind exploitation of fruit production area. And the corresponding development countermeasures were put forward, that is, to develop diversified tourism programs, to allocate mountainous resources according to local conditions, to train the local tourism staff, to dredge the area with poor sanitation, to diversify business with other industries supporting the development of tourism agriculture.
