【摘 要】
:
Previous investigations have shown that nifA gene is involved in nodulation and symbiotic nitrogen fixation regulation of Rhizobium. We study the role of nifA on nodulation of leguminous plants. We fo
【出 处】
:
Chinese Science Bulletin
论文部分内容阅读
Previous investigations have shown that nifA gene is involved in nodulation and symbiotic nitrogen fixation regulation of Rhizobium. We study the role of nifA on nodulation of leguminous plants. We found that Sinorhizo-bium fredii harboring multi-copy
其他文献
一、工程图的常用视图 工程图常用的视图 类型包括:一般视图、投 影视图、详细视图、辅助 视图、旋转视图。创建这 些视图所用的菜单如图1 所示。
Three dimensional digitization of human head is desired in many applications. Inthis paper, an information fusion based scheme is presented to obtain 3-D information of humanhead. Structured light tec
This letter presents an efficient and simple image segmentation method for semantic object spatial segmentation. First, the image is filtered using contour-preserving filters. Then it is quasi-flat la
In this letter, drawbacks of the classical algorithm to enhance the fuzzy contrast among adjacent regions are analyzed. Based on it, a new fuzzy enhancement algorithm and a linear fuzzy distribution t
今年年初,一种全新的彩色条形码开始在全日本推广使用。据悉,彩色条形码是由韩国延世大学信息产业工程系教授韩铎敦研究开发的。彩色条形码采用红、绿、蓝、黑4种颜色,比只用黑白表示商品信息的黑色条形码增加了10倍的信息容量。
本文设计并实现了一个交互实时的多分辨率地形绘制系统 ,介绍了系统的组成、实时优化方法以及地形几何和纹理数据表示和管理方法 ,并通过一实例对地形绘制系统的性能进行了评价。从绘制结果看 ,系统对地形进行实时优化时折衷考虑了图象绘制质量和绘制速率 ,在图象质量没有明显退化的情况下极大地改善了地形绘制的性能
处理CT或MRI图象得到骨骼轮廓边缘的离散数据点后,如何对数据点进行处理以获得光顺、保留原轮廓特征的曲线是三维重建过程中的重要内容。应用分段参数化样条插值方法处理轮廓点列,针对封闭曲线插值提出的计算方法简洁并易于编程实现;此外该方法为后续重建过程中需要进一步计算轮廓几何特征参数打下基础。
Traditional image segmentation algorithms exhibit weak performance for plant cells which have complex structure. On the other hand, pulse-coupled neural network (PCNN) based on Eckhorns model of the c
On 10 January, 1998 an earthquake of Ms=6.2 occurred in the Zhangbei-Shangyi region of North China. The surface seismic deformation was measured in the previous study using the 3 pass ERS-1/2 SAR diff