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NITROGEN FIXATION OF Azorhizobium IN ARTIFICIALLY INDUCED ROOT PARA-NODULES IN WHEAT

Science China Chemistry 1992年第12期35卷 1463-1470页

作者：陈廷伟 siegfried scherer PETER BGER Soils and Fertilizer Institute Chinese Academy of Agriculiural SciencesBeijing 100081PRC Bacteriological Institute Faculty of Agriculture Technical University Munchen D-8050 Freising Germany Lehrstuhl für Physiologie und Biochemie der Pflanzen Universitat Konstanz D-7750 Konstanz Germany

Nodule-like structures (para-nodules) can be induced in wheat roots by low concentrationsof 2,4-dichlorophenoxyacetic acid (2,4-D), a synthetic analogue of the plant growth hor-mone indole-acetic acid. Growth of nodulated wheat plants was not affected by 2,4-D treat-ment. Infection of these?para-nodules by adding oxygen-tolerant Azorhizobium caulinodans isolat-ed from stem nodules of the tropical legume Sesbania rostrata resulted in massive prolifera-tion of bacterial cells in the intercellular spaces as well as inside the para-nodular ***-nodules colonized by Azorhizobium coulinodans not only reduced acetylene, but alsotransferred fixed nitrogen to the plant, contributing up to 16--23% of the nitrogen budgetof infected wheat.

关键词： Azorhizobium nitrogen fixation nodules wheat

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固氮根瘤菌(Azorhizoboium)在人工诱发小麦类根瘤中的固氮作用

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中国科学:化学 1992年第7期 712-716+788页

作者：陈廷伟,siegfried scherer,Peter Bger 中国农业科学院土壤肥料研究所 Bacteriological Lehrstuhl 北京 100081 Institute Faculty of Agriculture Technical University Mǖnchen D-8050 Freising Germany fǖr Physiologie und Biochemie der Pflanzen Universitat Konstanz D-7750 konstanz Germany

用低浓度类似于植物生长激素吲哚乙酸的合成物2,4-二氯苯氧乙酸(2,4,-D)处理小麦根部能诱发瘤状结构(类根瘤),结瘤小麦植株生长不受2,4-D处理影响。这些类根瘤可被从热带豆科植物毛萼田菁(Sesbania rostrata)茎瘤中分离的耐氧茎瘤固氮... 详细信息

用低浓度类似于植物生长激素吲哚乙酸的合成物2,4-二氯苯氧乙酸(2,4,-D)处理小麦根部能诱发瘤状结构(类根瘤),结瘤小麦植株生长不受2,4-D处理影响。这些类根瘤可被从热带豆科植物毛萼田菁(Sesbania rostrata)茎瘤中分离的耐氧茎瘤固氮根瘤菌(Azorhizobium caulinodans)侵染,使类根瘤内的细胞间隙和细胞内有大量菌体增殖,有茎瘤固氮根瘤菌拓殖的类根瘤不仅能还原乙炔,而且还能将固定的氮素转移给植株,向结瘤小麦提供16—23％的氮素。

关键词：固氮根瘤菌固氮根瘤小麦

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Student Evaluations of the Courses in Medical Psychology at the Medical Department of the RWTH Aachen: A Three-Year Report

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Open Journal of Medical Psychology 2012年第4期1卷 63-67页

作者： Anne scherer Thomas Forkmann Sandra Sudmann siegfried Gauggel Institute of Medical Psychology and Medical Sociology University Hospital of the Rheinisch-Westfalische Technische Hochschule AachenAachenGermany Dean’s Office Medical FacultyRheinisch-Westfalische Technische Hochschule AachenAachenGermany

Introduction: With the introduction of a new curriculum “Modellstudiengang Medizin” in Aachen, the education in medical psychology was also restructured. This paper presents data from the students’ evaluations of the Basic Course in Medical Psychology and the new teaching format “Systemblock Psyche” over a three-year time span. Method: All students were asked to evaluate the courses anonymously online. Effect sizes [1] were calculated to compare acceptance of the different course types and also changes across time. Results: Both the Basic Course in Medical Psychology and the Systemblock Psyche were rated as “good” to “satisfactory” and were in their overall acceptance comparable to other courses and system blocks. Continuous improvement in acceptance was found for the Basic Course (d = 0.30 - 0.57). The Systemblock Psyche received varying evaluations but achieved higher scores on comprehensibility (d = 0.20) and communication among teachers (d = 0.34) than other system blocks. On the other hand, students rated the education in medical psychology as less relevant than other courses (d = 0.28 and 0.77, respectively). Conclusion: Overall, the acceptance rating was satisfactory and comparable to other evaluation studies conducted in earlier curricula. However, ratings of the relevance of the courses in medical psychology were disappointing and indicate the difficulty of teaching a biopsychosocial model to medical students.

关键词： Teaching Evaluation Education in Medical Psychology Modellstudiengang Systemblock

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