Wheat is one of the most important crops in China, and its genetic improvement has always been a research focus. In recent years, transgenic technology has been increasingly applied to improve the yield and quality, i...Wheat is one of the most important crops in China, and its genetic improvement has always been a research focus. In recent years, transgenic technology has been increasingly applied to improve the yield and quality, increase the resistance of disease, pest and stresses in wheat. The review pays particular attention to the current research progress on wheat transformation techniques, including expression vectors, reporter genes, selectable markers, genes of interest, explants and transformation methods. Based on this, the existing problems in wheat transformation techniques are discussed and the prospect of genetic breeding in wheat is also reviewed.展开更多
This paper aims to explore the relationship between logistics firm size and business diversification, especially in micro-</span><span style="font-family:""> </span><span style=&quo...This paper aims to explore the relationship between logistics firm size and business diversification, especially in micro-</span><span style="font-family:""> </span><span style="font-family:""><span style="font-family:Verdana;">and small-sized enterprises, and assess the diversification process of Chongqing logistics enterprises using new data source. It is inte</span><span style="font-family:Verdana;">nded to contribute to theoretical research on diversification in the emerging logistics industry based on resource-based view (RBV) and factor production theory. We innovatively establish the logistics business classification system, then measure the degree and direction of diversification of lo</span><span style="font-family:Verdana;">gistics enterprises based on mean narrow-spectrum diversification-based</span><span style="font-family:Verdana;"> product count methods. The empirically shows that there are a growing number of highly-diversified logistics enterprises in general, with an average annual increase of 14.23%. Especially after 2008, small and medium-sized enterprises developed towards r</span><span style="font-family:Verdana;">elated diversification while micro-sized enterprises came to the opposite conclusion. For them, creating unrelated diversified business is a crucial way to generate a competitive advantage. Unlike the conclusions derived from other industries, small-sized logistics enterprises are prone to try a new business, both related and unrelated, for better survival and performance. And changes in the firm size of medium and large-sized enterprises have little impact on the development of the business diversification.展开更多
基金Supported by the Basic and Frontier Technology Research Programs from the Department of Science and Technology of Henan Province (072300430120)
文摘Wheat is one of the most important crops in China, and its genetic improvement has always been a research focus. In recent years, transgenic technology has been increasingly applied to improve the yield and quality, increase the resistance of disease, pest and stresses in wheat. The review pays particular attention to the current research progress on wheat transformation techniques, including expression vectors, reporter genes, selectable markers, genes of interest, explants and transformation methods. Based on this, the existing problems in wheat transformation techniques are discussed and the prospect of genetic breeding in wheat is also reviewed.
文摘This paper aims to explore the relationship between logistics firm size and business diversification, especially in micro-</span><span style="font-family:""> </span><span style="font-family:""><span style="font-family:Verdana;">and small-sized enterprises, and assess the diversification process of Chongqing logistics enterprises using new data source. It is inte</span><span style="font-family:Verdana;">nded to contribute to theoretical research on diversification in the emerging logistics industry based on resource-based view (RBV) and factor production theory. We innovatively establish the logistics business classification system, then measure the degree and direction of diversification of lo</span><span style="font-family:Verdana;">gistics enterprises based on mean narrow-spectrum diversification-based</span><span style="font-family:Verdana;"> product count methods. The empirically shows that there are a growing number of highly-diversified logistics enterprises in general, with an average annual increase of 14.23%. Especially after 2008, small and medium-sized enterprises developed towards r</span><span style="font-family:Verdana;">elated diversification while micro-sized enterprises came to the opposite conclusion. For them, creating unrelated diversified business is a crucial way to generate a competitive advantage. Unlike the conclusions derived from other industries, small-sized logistics enterprises are prone to try a new business, both related and unrelated, for better survival and performance. And changes in the firm size of medium and large-sized enterprises have little impact on the development of the business diversification.
