Production of bacterial blight resistant lines from somatic hybridization between Oryza sativa L.and Oryza meyeriana L.

Novel bacterial blight (BB) resistance gene(s) for rice was (were) introduced into a cultivated japonica rice variety Oryza sativa (cv. 8411), via somatic hybridization using the wild rice Oryza meyeriana as the donor of the resistance gene(s). Twenty-nine progenies of somatically hybridized plants were obtained. Seven somatically hybridized plants and their parents were used for AFLP (amplified fragment length polymorphism) analysis using 8 primer pairs. Results confirmed that these plants were somatic hybrids containing the characteristic bands of both parents. The morphology of the regenerated rice showed characters of both O. sativa and O. meyeriana. Two somatic hybrids showed highest BB resistance and the other 8 plants showed moderate resistance. The new germplasms with highest resistance have been used in the rice bfeeding program for the improvement of bacterial blight resistance.     

双Λ超核的相对论平均场研究

利用相对论平均场理论,结合单人超核的实验数据,研究了双人超核的基态性质;讨论了超子对原子核核芯的影响;考虑了超子一超子相互作用中矢量介子一超子张量耦合项的贡献;分别采用两套参数组进行了系统、自洽的计算,得到的结果与实验数据符合较好．     

禹州吹打班生存状态田野调查报告

禹州地区吹打班十分兴盛,当下多与丧葬仪式联系紧密。文章以禹州地区一个吹打班为着眼点,通过一次完整丧葬仪式的田野调查,以呈现豫中禹州地区鼓吹乐发展现状。     

Reflections on the Field of Higher Education: time,space and sub‐fields

The objective of this study is to define the field of higher education and clarify its identity. It examines three analytical dimensions which, it proposes, shape the field: knowledge, approach and community. It argues that contextual knowledge around the issue of higher education has defined the field but has not determined techniques that are specific to it. The core elements of these three dimensions— contextual knowledge, the diversity in approaches and the multi‐disciplinary and loosely coupled community—suggest diversity in the field and in its identity rather than coherence and consolidation. The two dimensions of approach and community partially relate to the development of the field as a product of efforts to solve financial and management problems caused by the expansion of higher education after World War II in the US, and, in terms of experience, in Europe where expansion came much later, increasing public interest in higher education.     

我国田径教练员在Internet学习环境中的自我学习与能力培养

Internet学习环境是现代社会生活中人们获取信息、自我学习、相互沟通和提高能力的重要教育环境内容.通过运用问卷调查、访谈等方法,对我国约50位国家级和高级田径教练员现阶段利用Internet学习环境进行自我学习和能力提高的状况进行调查研究.结果表明,绝大多数教练员对通过互联网进行学习与提高持肯定态度;但受主、客观多种因素的影响,Internet学习环境还未发挥其应有的作用.完善Interne学习环境需要多方长期不懈的努力.     

Parsing the language of racism and relief: Effects of a short-term urban field placement on teacher candidates’ perceptions of culturally diverse classrooms

This three-year study combines qualitative and quantitative analyses of effects of a one-week, intensive urban field placement on 95 suburban and rural teacher candidates’ self-reported perceptions of urban schools, students, teachers. Data was drawn from anonymous, open-ended, pre- and post-experience participant surveys; reflections; and alumni interviews. Findings include improvement in confidence in cross-cultural teaching abilities and interest in urban schools for future employment. Pre-service teachers’ perceptions can be meaningfully influenced by a short-term, cross-cultural immersion program when it is situated within a mutually-reinforcing, multicultural education curriculum that offers significant faculty scaffolding and structured reflection.     

基于DDS和FPGA的多制式数字调制源的设计

介绍了DDS芯片AD9852和FPGA（现场可编程门阵列）相结合的全数字方法,直接在70MHz中频上实现多制式信号调制。通过FPGA编程实现对DDS所产生的多种不同调制信号的控制,从而实现远距传输信息的目的。     

300m跨栏跑丈量数据补缺

依据《田径竞赛规则》中栏架设置规定和相关田径理论,利用《标准田径场地十二点丈量法》中有关基准点计算出三种类型标准田径场地300m跨栏跑的放射丈量数据,弥补了目前该项目测量数据的空白,为体育教学、训练和竞赛场地测画工作提供参考依据.     

Effects of nitrogen fertilization strategies on nitrogen use efficiency in physiology,recovery, and agronomy and redistribution of dry matter accumulation and nitrogen accumulation in two typical rice cultivars in Zhejiang,China

Field experiments were conducted in farmers’ rice fields in 2001 and 2002 to study the effects of nitrogen (N) management strategies on N use efficiency in recovery (RE), agronomy (AE) and physiology (PE) and redistribution of dry matter accumulation (DMA) and nitrogen accumulation (NA) in two typical rice cultivars in Jinhua, Zhejiang Province. This study aimed mainly at identifying the possible causes of poor fertilizer N use efficiency (NUE) of rice in Zhejiang by comparing farmers’ fertilizer practice (FFP) with advanced site-specific nutrient management (SSNM) and real-time N management (RTNM). The results showed that compared to FFP, SSNM and RTNM reduced DMA and NA before panicle initiation and increased DMA and NA at post-flowering. There is no significant difference between SSNM and FFP in post-flowering dry matter redistribution (post-DMR) and post-flowering nitrogen redistribution (post-NR). These results suggest that high input rate of fertilizer N and improper fertilizer N timing are the main factors causing low NUE of irrigated rice in the farmer’s routine practice of Zhejiang. With SSNM, about 15% of the current total N input in direct-seeding early rice and 45% in single rice could be reduced without yield loss in Zhejiang, China. Project supported by the International Rice Research Institute (IRRI), Swiss Agency for Development and Cooperation (SDC), the Potash & Phosphate Institute and the Potash & Phosphate Institute of Canada (PPI-PPIC), the International Fertilizer Industry Association (IFA), the International Potash Institute (IPI), and 948 Project of the Ministry of Agriculture of China (No. 2003-Z53)     

中草药提取物对植物病菌抑制和病害防治作用

测定了中草药对植物病原真菌的室内抑菌作用和田间防效.结果表明,白藓皮对小麦赤霉病、小麦纹枯病菌、小麦黑粉病菌、番茄灰霉病菌、番茄早疫病菌的菌丝生长,对番茄早疫病菌、番茄灰霉病菌、小麦赤霉病菌的孢子萌发具有较强抑制作用,0.2 g/mL白藓皮对番茄早疫病、番茄灰霉病、小麦赤霉病的防效分别为76.3%、82.3%和75.1%;胡椒对小麦纹枯病菌、小麦黑粉病菌、番茄早疫病菌、山芋黑疤病菌的菌丝生长,对番茄早疫病菌孢子萌发具有较强抑制作用,0.2 g/mL胡椒对番茄早疫病防效为74.5%;甘草对番茄早疫病菌菌丝生长和孢子萌发有较强抑制作用,0.2 g/mL甘草对番茄早疫病防效为70.9%.