药用植物圆叶牵牛种子萌发耐盐性分析

研究了圆叶牵牛种子在6种浓度（0,50,100,150,250和400 mmol.L-1）NaCl胁迫及6种温度（15,20,25,30,35,40℃）条件下的发芽率.结果表明,NaCl浓度低于50 mmol.L-1对种子萌发的影响不大,但高于100 mmol.L-1时随NaCl浓度的升高,相对发芽率显著降低,直至0,浓度为150 mmol.L-1时,对种子萌发抑制作用最大;圆叶牵牛种子萌发的最适温度为15~20℃,高于25℃时,温度越高,发芽率越低,35℃以上不能萌发.     

蓝靛果忍冬花粉形态研究

利用扫描电子显微镜首次对蓝靛果忍冬的花粉进行观察分析,并详细地描述了其花粉的外部形态,为东北地区蓝靛果忍冬的分类提供基础性依据.结果表明:蓝靛果忍冬花粉粒大小、形态和外壁纹饰可作为分种参考.     

国内外二语词缀习得实证研究现状述评

词缀知识是二语词汇知识框架中的重要组成部分,有利于学习者扩大词汇量及词汇广度。对近十几年在国内外主要外语期刊上发表的为数不多的关于二语词缀习得的实证性研究进行总结分析,并指出其局限性及对未来研究的启示。     

Hg2+、Cr3+及复合污染下对苦草的SOD、POD活性变化的实验研究

本文研究了不同浓度Hg2 、Cr3 以及二者共同胁迫对苦草.O-2、MAD含量和SOD、POD的影响,实验结果表明:单离子随浓度的增加,对苦草的毒性效应呈现加重趋势,同浓度情况下Hg2 比Cr3 毒性效应明显;Hg2 、Cr3 共同作用所产生的毒性效应大于单一Hg2 、Cr3 .具体表现为随着Hg2 、Cr3 浓度的增加,.O-2、MAD含量先升后降,MAD峰值较.O-2滞后,SOD、POD活性先升后降;这些都表明抗氧化酶系统在清除活性氧自由基过程中起一定作用和具有抗性机制,但植物抗性能力是有一定范围的.     

German employee inventors’ compensation records: A window into the returns to patented inventions

This paper uses a novel data source, namely German employee inventors’ compensation records compiled in compliance with the German Employee Invention Act of 1957 to estimate the returns to patented inventions. In contrast to patent value estimates obtained from surveys and renewals, these records primarily provide a measure of the value of the use of the invention and not the value of patent protection. While indicators of patent value explain much of the variation in these patent value estimates, the values are only weakly correlated with the estimated renewal value of the patents. The distribution of patent value from these records is highly skew, with the vast majority of the returns earned by a select set of high valued patents, consistent with finding for other measures of patent value. The value estimates however are considerably lower than recent survey estimates with most of the patents having little or no realized value, suggesting that the returns appropriated through the use of an invention may represent only a fraction of the value of a patented invention.     

Applying open innovation in business strategies: Evidence from Finnish software firms

Our study aims at shedding light on the innovative business strategies in the software sector and understanding better the economics that underlies the supply of Open Source Software (OSS). We use survey data collected from 170 Finnish software companies to investigate how different properties of software firms, such as size, age, intellectual capital, absorptive capacity, and ownership structure affect their decisions to base their business strategies on OSS supply or proprietary distribution of products and services.Our empirical findings indicate that the adoption of technologically advanced strategies requiring complex legal and managerial knowledge, such as the OSS supply strategy, demands relatively highly educated employees. The support for and development of an education system providing highly skilled people from different fields are essential for the firms’ successful adoption of innovative business strategies. We also find that market entrants have largely driven the OSS adoption, but there are no significant age-related differences in the adoption behavior of incumbent software firms.     

Productivity impact of technology spillover from multinationals to local firms: Comparing China's automobile and electronics industries

This study compares the impact of innovative activities of multinationals on local firms in China's automobile and electronics industries. In the automobile industry we find that both multinationals and local firms in the assembly industry have vertical spillovers to local parts supply firms. In contrast, in the electronics industry, only a small amount of vertical spillover effects from local firms can be found. Furthermore, we find that horizontal spillovers exist in neither the automobile industry nor the electronics industry.     

圣彼得堡数学学派的发展

圣彼得堡数学学派是俄罗斯在数学领域创建最早、实力最强、影响最大的学派,是数学发展史上非常成功的案例。文章在研读原始文献的基础上,探讨了圣彼得堡数学学派的数学成就及其发展。     

Impacts of internal R&D on firms’ performance and energy consumption: Evidence from Ethiopian firms

In recent decades, with the rapid development of the knowledge economy and science, countries have embraced technical innovation and have gradually increased investment in research and development (R&D). A vast literature indicates that the relationship between R&D and firm performance is highly complex. The evidence suggests that R&D positively influences firm performance, yet findings on the process by which this happens are mixed. Rigorous analyses are required on how R&D investments affect energy consumption. This study explores the impact of R&D investment on the performance and energy consumption of 476 firms in Ethiopia by employing a combination of fixed-effect, propensity score matching, and endogenous treatment effect estimation methods. The empirical results reveal that investment in R&D positively influences both innovation and long-term financial performance but negatively impacts short-term financial performance and energy consumption. The results also show that the impacts of R&D activities vary significantly across different categories of firms, confirming that heterogeneity may be an issue among the firms considered. The results also indicate that the availability of credit is a more important moderating factor in the relationship between R&D investment and firm performance than the legal system is. These results have important implications for firms with growing R&D operations, especially those in developing countries such as Ethiopia. Ethiopian firms should invest more in R&D activities, such as in fundamental and applied research, to improve performance and enhance competitiveness.     

A novel mutation in CD40 ligand gene in a sporadic patient with hyper-IgM syndrome

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