Ontology is the formal representation of concepts and their mutual relations. It has wide application potential in the classification of agricultural information, the construction of information and knowledge database...Ontology is the formal representation of concepts and their mutual relations. It has wide application potential in the classification of agricultural information, the construction of information and knowledge database, the research and development of intelligent search engine, as well as the realization of cooperative information service, etc. In this research, an ontology-based agricultural knowledge management system framework is proposed, which includes modules of ontology-based knowledge acquisition, knowledge representation, knowledge organization, and knowledge mining, etc. The key technologies, building tools and applications of the framework are explored. Future researches on the theoretical refinement and intelligent simulation knowledge service are also envisioned.展开更多
【目的】利用Meta分析对有关益生菌对断奶仔猪小肠形态的影响试验进行评价,为解决仔猪生产过程中的肠道健康问题提供参考依据。【方法】基于中国知网(CNKI)、万方数据(Wanfang Data)、CQVIP、Web of Science及Science-Direct等数据库,...【目的】利用Meta分析对有关益生菌对断奶仔猪小肠形态的影响试验进行评价,为解决仔猪生产过程中的肠道健康问题提供参考依据。【方法】基于中国知网(CNKI)、万方数据(Wanfang Data)、CQVIP、Web of Science及Science-Direct等数据库,全面检索收集益生菌对断奶仔猪小肠形态影响的研究文献,采用RevMan 5.3进行Meta分析。【结果】最终纳入22篇研究文献,试验组和对照组均为137头仔猪,试验组以益生菌作为添加物,对照组为空白。Meta分析结果表明:益生菌组对断奶仔猪十二指肠绒毛高度的影响显著优于空白组(P=0.01,SMD=0.81,95%CI=0.19~1.44),对隐窝深度的影响显著低于空白组(P=0.0008,SMD=-0.74,95%CI=-1.18^-0.31);益生菌组对空肠绒毛高度的影响显著优于空白组(P<0.0001,SMD=0.97,95%CI=0.49~1.46),对隐窝深度的影响差异不显著(P=0.58,SMD=-0.12,95%CI=-0.56~0.31);益生菌组对回肠绒毛高度的影响显著优于空白组(P=0.0003,SMD=1.20,95%CI=0.55~1.85),对隐窝深度的影响差异不显著(P=0.09,SMD=-0.58,95%CI=-1.25~0.10)。根据益生菌的菌属进行亚组分析,结果显示,酵母菌属组和复合菌株组对十二指肠、空肠的绒毛高度无影响,乳杆菌属组和肠球菌属组可显著提高十二指肠、空肠、回肠的绒毛高度。敏感性分析结果较稳健;发表偏倚结果显示有一定的发表偏倚,但偏倚程度不明显。【结论】益生菌通过显著提高十二指肠、空肠和回肠的绒毛高度及降低十二指肠隐窝深度,以改善断奶仔猪小肠的形态结构,其中,乳杆菌属组和肠球菌属组对绒毛高度的影响较显著,复合益生菌对十二指肠隐窝深度的影响显著。即益生菌在保护小肠肠道健康方面具有重要潜力,但需要注意同属不同菌种间的差异。展开更多
This paper puts forward a construction method based on ontology for the Pearl River Basin fish production, to facilitate the domain knowledge analysis and information retrieval. By converting the concepts and terms in...This paper puts forward a construction method based on ontology for the Pearl River Basin fish production, to facilitate the domain knowledge analysis and information retrieval. By converting the concepts and terms in domain ordinally, the fish production ontology was constructed with the definition of classes, properties, instances, and relationships. The developed ontology model of the fish production knowledge is proposed and applied in the system of fish diseases diagnosis primarily. The research lays the semantic foundation for the further efficient knowledge management and practical application.展开更多
基金supported by the National Natural Science Foundation of China (2006AA10Z239)the National Key Technology Research and Development Program of China (2006BAD10A0501)
文摘Ontology is the formal representation of concepts and their mutual relations. It has wide application potential in the classification of agricultural information, the construction of information and knowledge database, the research and development of intelligent search engine, as well as the realization of cooperative information service, etc. In this research, an ontology-based agricultural knowledge management system framework is proposed, which includes modules of ontology-based knowledge acquisition, knowledge representation, knowledge organization, and knowledge mining, etc. The key technologies, building tools and applications of the framework are explored. Future researches on the theoretical refinement and intelligent simulation knowledge service are also envisioned.
文摘【目的】利用Meta分析对有关益生菌对断奶仔猪小肠形态的影响试验进行评价,为解决仔猪生产过程中的肠道健康问题提供参考依据。【方法】基于中国知网(CNKI)、万方数据(Wanfang Data)、CQVIP、Web of Science及Science-Direct等数据库,全面检索收集益生菌对断奶仔猪小肠形态影响的研究文献,采用RevMan 5.3进行Meta分析。【结果】最终纳入22篇研究文献,试验组和对照组均为137头仔猪,试验组以益生菌作为添加物,对照组为空白。Meta分析结果表明:益生菌组对断奶仔猪十二指肠绒毛高度的影响显著优于空白组(P=0.01,SMD=0.81,95%CI=0.19~1.44),对隐窝深度的影响显著低于空白组(P=0.0008,SMD=-0.74,95%CI=-1.18^-0.31);益生菌组对空肠绒毛高度的影响显著优于空白组(P<0.0001,SMD=0.97,95%CI=0.49~1.46),对隐窝深度的影响差异不显著(P=0.58,SMD=-0.12,95%CI=-0.56~0.31);益生菌组对回肠绒毛高度的影响显著优于空白组(P=0.0003,SMD=1.20,95%CI=0.55~1.85),对隐窝深度的影响差异不显著(P=0.09,SMD=-0.58,95%CI=-1.25~0.10)。根据益生菌的菌属进行亚组分析,结果显示,酵母菌属组和复合菌株组对十二指肠、空肠的绒毛高度无影响,乳杆菌属组和肠球菌属组可显著提高十二指肠、空肠、回肠的绒毛高度。敏感性分析结果较稳健;发表偏倚结果显示有一定的发表偏倚,但偏倚程度不明显。【结论】益生菌通过显著提高十二指肠、空肠和回肠的绒毛高度及降低十二指肠隐窝深度,以改善断奶仔猪小肠的形态结构,其中,乳杆菌属组和肠球菌属组对绒毛高度的影响较显著,复合益生菌对十二指肠隐窝深度的影响显著。即益生菌在保护小肠肠道健康方面具有重要潜力,但需要注意同属不同菌种间的差异。
基金supported by the National Natural Science Foundation of China (2006AA10Z239)the National Key Technology R&D Program of China (2006BAD10A0501)
文摘This paper puts forward a construction method based on ontology for the Pearl River Basin fish production, to facilitate the domain knowledge analysis and information retrieval. By converting the concepts and terms in domain ordinally, the fish production ontology was constructed with the definition of classes, properties, instances, and relationships. The developed ontology model of the fish production knowledge is proposed and applied in the system of fish diseases diagnosis primarily. The research lays the semantic foundation for the further efficient knowledge management and practical application.
