摘要：
Recently, with the development of internet technology, the decrease of personal computers' price, and an increasing number of computer-trained consumers, the internet population has grown tremendously in China. The purpose of this study is to examine the relationship between online shopping behavior (SHOP) and other factors, including perceived usefulness (PU), perceived ease of use (PEOU), perceived risk (PR), perceived service quality (PSQ), perceived popularity (PP), and perceived public praise (PPP). The study shows that PU, PEOU, PP, and PPP have a significantly positive impact on customers' online shopping behavior, and PP has a relatively great impact on customers' online shopping behavior. However, PR is negatively related to online shopping behavior, and PSQ does not have an impact on customers' online shopping behavior.
摘要：
抗菌肽是上个世纪70年代由瑞典科学家Boman H G首次发现的,其具有优良的光谱抗菌性能,无残留,不会导致耐药菌株的出现,是目前抗生素类较有潜力的替代品。早在上世纪80年代,人们就试图通过转基因等生物工程技术改良物种或大量表达该类物质,目前已有众多的表达体系和转基因动植物研究成功,并有一些抗菌肽类药物投入临床使用。文中综述了近年来国内外关于抗菌肽的分离提取、体外表达和转基因动植物技术,主要论述该物质在基因和生物工程方面研究进展,从而为其规模化生产利用提供参考和借鉴。
摘要：
To assess the influence of long-term fertilization on weed communities of early and late rice crops, the weed species composition was investigated in experimental plots initiated in 1981 at the Key Field Experimental Monitoring Station of the Reddish Paddy Soil Eco-Environment in Wangcheng, China. The treatments were (1) a control (CK), no fertilizer; (2) N–P, no K; (3) N–K, no P; (4) P–K, no N; (5) N–P–K; (6) N–P–K + Ca, N, P, and K plus lime; (7) N–P + S, N and P plus additional rice straw return; (8) N–P–K + S, N, P, and K plus additional rice straw; (9) N–K + M, N and K plus swine manure. The results indicated that weed flora composition and density were influenced by the different fertilization treatments. Multivariate analyses indicated that changes in the weed community composition were primarily due to soil-available N, followed by light intensity on the field surface, and soil-available P. More weed species and total weed density were observed in the control and P–K plots than in plots in which N, P, and K were applied together. Omission of N application had a greater effect on the weed community than the omission of P or K applications. Nutrients derived from synthetic fertilizers and organic manure or the additional application of lime had no obvious effect on the weed community of late rice crops. Nomenclature: Rice, Oryza sativa L.
