结合2－分次环的模及Jacobson根

定义了结合２－分次环的模，并由模定义了结合２－分次环的Ｊａｃｏｂｓｏｎ根．证明了这个Ｊａｃｏｂｓｏｎ根和Ａ．Ｓｕｌｉｎｓｋｉ的定义是一致的，并且给出了Ｊａｃｏｂｓｏｎ半单的结合２－分次环的结构及Ｊａｃｏｂｓｏｎ根的模论特征。     

结合2—分次环的模及Jacobson根

定义了结合２－分次环的模，并由模定义了结合２－分次环的Ｊａｃｏｂｓｏｎ根，证明了这个Ｊａｃｏｂｓｏｎ根和Ａ．Ｓｕｌｉｎｓｋｉ的定义是一致的，并且给出了Ｊａｃｏｂｓｏｎ半单的结合２－分次环的结构及Ｊａｃｏｂｓｏｎ根的模论特征。     

An Object-Relational Database Prototype O-RBASE(extracted)

ＡｎＯｂｊｅｃｔ－ＲｅｌａｔｉｏｎａｌＤａｔａｂａｓｅＰｒｏｔｏｔｙｐｅＯ－ＲＢＡＳＥ（ｅｘｔｒａｃｔｅｄ）ＬｉＴｉａｎｚｈｕ；ＨｕａｎｇＷｅｉ；ＭａＸｉｕｌｉ；ＲｅｎＪｉａｎｌｉ（ＣｏｍｐｕｔｅｒＣｅｎｔｅｒ，ＨｅｂｅｉＵｎｉｖｅｒｓｉｔｙ，Ｂａｏ...     

人粒细胞集落刺激因子在昆虫细胞中的表达

利用苜蓿尺核型多角 体病带β－Ｇａｌａｃｔｏｓｉｄａｓｅ基因标志的非融合蛋白基因转移载体ｐＢＢ成功地构了重组杆状病毒ＡｃＮＰＶ－Ｇ－ＣＳＦ．在感染重组病毒的草地夜蛾细胞中ｈＧ－ＣＳＦ得到了高效表达。表达产物由ＷｅｓｔｅｒｎＢｌｏｔ检出，其分子量约为１９ＫＤａ。     

不同分子量的探针在细胞间的运输

利用Ｏｐｔｏｎ显微注射系统（Ｍｉｃｒｏｉｎｊｅｃｔｉｏｎｓｙｓｔｅｍ）将不同分子量的荧光分子探针分别注射到不同生育期的紫竹梅雄蕊花丝毛细胞内，在ＯｌｙｍｐｕｓＢＨ—２型荧光显微镜下观察探针在细胞内的转移情况，取得以下结果，花蕾和开放花的雄蕊花丝毛细胞的胞间连丝允许ＬＲＢ（５５９Ｄａ），ＦＩＴＣ－（Ａｌａ）６（８７０．３Ｄａ）通过，而ＦＩＴＣ－Ｌｅｕ－Ａｒｇ－Ａｒｇ－Ａｌａ－Ｓｅｒ－Ｖａｌ－Ａｌａ（１１６１．３Ｄａ）难以通过．花蕾和开放花的雄蕊花丝毛细胞间的胞间连丝的通透性差异不大．且允许通过的分子探针不超过１１６１．３Ｄａ．在花蕾和开放花的雄蕊花丝毛细胞间不能通过的分子探针ＦＩＴＣ－Ｌｅｕ－Ａｒｇ－Ａｒｇ－Ａｌａ－Ｓｅｒ－Ｖａｌ－Ａｌａ（１１６１．３Ｄａ），ＦＩＴＣ－ＩｎｓｕｌｉｎＡＣｈａｉｎ（２９２１．０Ｄａ）在衰老花雄蕊花丝毛细胞间可以转移，但分子量为４４００．０Ｄｅ和９４００．０Ｄａ的ＦＩＴＣ－Ｄｅｒｔｒａｎ探针却难以转移．胞间连丝的通透性能，随着植物的生长发育发生相应的变化．     

猫儿屎植物的化学成分及其药效学研究

首次从木通科猫儿屎（ＤｅｃａｉｓｎｅａｆａｒｇｅｓｉｉＦｒａｎｃｈ）中分离鉴定了１１种皂甙化合物．经光谱分析及化学方法鉴定，其中５种化合物为新化合物，分别命名为：ＤｅｃａｉｓｏｓｉｄｅＡ、Ｂ、Ｃ、Ｄ、Ｇ；另５种化合物为ＳａｐｏｎｉｎＰＧ、ＤｉｐｓａｃｏｓｉｄｅＢ、Ｋａｌｏｐａｎａｘ－ｓａｐｏｎｉｎＢ、Ｓａｐｏｎｉｎ１１、ＨｅｄｅｒａｓａｐｏｎｉｎＢ和ｓａｐｏｎｉｎＰＪ３．猫儿屎对小鼠移植性肿瘤Ｓ１８０（小白鼠肉瘤）、Ｈｅｐａ（肝癌）、Ｅｃ（艾氏病）的平均抑制率分别为４７．８０％、４１．４８％、４４．７１％，具有一定的抗肿瘤活性．     

猫儿尿植物的化学成分及其药效学研究

首次从木通科猫儿尿（ＤｅｃａｉｓｕｅａｆａｒｇｅｓｉｉＦｒａｎｃｈ）中分离鉴定了１１种皂甙化合物，经光谱分析及化学方法鉴定，其中５种化合物为新化合物，分别命名为：ＤｅｃａｉｓｏｓｉｄｅＡ，Ｂ，Ｃ，Ｄ，Ｇ；另５种化合物为ＳａｐｏｎｉｎＰＧ，ＤｉｐｓａｃｏｓｉｄｅＢ，Ｋａｌｏｐａｎａｘ－ｓａｐｏｎｉｎＢ，Ｓａｐｏｎｉｎ１１，ＨｅｄｅｒａｓａｐｏｎｉｎＢ和ｓａｐｏｎｉｎＰＪ３，猫儿尿对小鼠移植性肿瘤Ｓ１     

STEP Based CAD/CAM System Integration

ＳＴＥＰＢａｓｅｄＣＡＤ／ＣＡＭＳｙｓｔｅｍＩｎｔｅｇｒａｔｉｏｎ￥ＸｉａｏＫｅ，ＳｕｎＪｉａｇｕａｎｇ肖可，孙家广（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｏｌｏｇｙ，ＴｓｉｎｇｈｕａＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎ...     

捕食线虫真菌自发产生捕食器官的菌株筛选

在Ｃｚａｐｅｋ,ＰＤＡ,ＣＭＡ,ＷＡ四种培养基上,从２１株捕食线虫真菌中筛选到７株在无线虫诱导条件下能自发形成捕食器官的真菌,这些菌株是：Ｊ８－１（Ａｒｔｈｒｏｂｏｔｒｙｓ ｌｌｉｇｏｓｐｏｒａ ｖａｒ．ｏｌｉｇｏｓｐｏｒａ）,ＭＷ１７－２（Ａ．ｊａｖａｎｉｃａ）,Ｊ３１－１（Ａ．ｖｅｒｍｉｃｏｌａ）,Ｊ３４－１（Ｄａｃｔｙｌｅｌｌａ ｌｅｐｔｏｓｐｏｒａ）,ＸＺ９－２,ＸＳ２－２,Ｏ１－１（Ａ．     

Virtual-actual Space Alignment Based on Salient Color Features in VR Aided Tele-operation System

Ｖｉｒｔｕａｌ┐ａｃｔｕａｌＳｐａｃｅＡｌｉｇｎｍｅｎｔＢａｓｅｄｏｎＳａｌｉｅｎｔＣｏｌｏｒＦｅａｔｕｒｅｓｉｎＶＲＡｉｄｅｄＴｅｌｅ┐ｏｐｅｒａｔｉｏｎＳｙｓｔｅｍＹａｎｇＹｕｄｏｎｇ（杨雨东），ＸｕＧｕａｎｇｙｏｕ（徐光礻右），ＺｅｎｇＪｉａｎ...     

从《荒野的呼唤》中布克的形象透视杰克伦敦的精神世界

本文首先简述了杰克·伦敦的生平,然后结合杰克·伦敦的生平和思想,就杰克·伦敦的代表作<荒野的呼唤>中"布克"的形象,从"杰克·伦敦个人思想情感"和"作家激越的精神追求"两个方面,论述了杰克·伦敦的精神世界在"布克"这个艺术形象上的体现.     

甜菜夜蛾多核壳型核型多角体病毒vp39基因的克隆与表达

参照苜宿银纹夜蛾核型多角体病毒（AcMNPV)衣壳蛋白基因vp39的序列设计引物,采用PCR技术扩增了甜菜夜蛾核型多角体病毒的约1．3kb片段,通过将片段亚克隆至原核表达载体pET-28构建出重组表达质粒pET-Se39,以pET-Se39转化E.coli BL21。经IPTG诱导后,SeMNPVvp39基因高效表达,SDS－PAGE分析显示表达产物的分子量为39KD,并且表达量在IPTG诱导4h达到最高水平。／     

The study of antioxidant activities of fucoidan from Laminaria japonica

Two large molecular weight fucoidan fractions F-A and F-B were obtained by water extraction and anion-exchange chromatography and then L-A and L-B with low molecular weight and uronic acid content were prepared by radical process degradation of F-A and F-B. The antioxidant activities of the fucoidan fractions on two oxygen free radicals and Cu2 -induced low-density lipoprotein (LDL) oxidation were studied. The results show that all the fucoidan fractions had excellent scavenging capacities on superoxide radical and hypochlorous acid, except the highly sulfated fraction L-B. In LDL oxidation system, low molecular weight fractions L-A and L-B exhibited great inhibitory effects on LDL oxidation induced by Cu2 , however F-A and F-B had little inhibitory effects in this system due to their large molecular weights. The present results suggest that fucoidan from Laminaria japonica is an excellent natural antioxidant and has great potential for preventing the free radical-mediated diseases.     

反相悬浮聚合法合成超高分子量聚丙烯酸钠

以丙烯酸钠和丙烯酰胺为单体,采用反相悬浮聚合法制备了超高分子量的聚丙烯酸钠(NaPA).研究了引发剂浓度、抗交联剂及其他助剂对合成产物聚丙烯酸钠性能的影响.结果表明,(NH4)2S2O8的最佳用量是0.15%(质量分数);随着CO(NH2)2用量的增加分子量提高明显;在聚合体系中加入甲基丙烯酸N,N-二甲氨基乙酯(DMAEMA)可提高分子量但用量应控制在9.4×10-4%～15.6×10-4%之间.同时用抗交联剂防止交联反应,结合使用醋酸钠和异丙醇这两种分子量调节剂不仅能提高分子量而且溶解性也得到改善.最终得到了分子量高达3.0×107的产物,其分子量和溶解性能较前人研究成果有明显提高.     

分子量双峰分布聚乙烯PE-SP2520的高速流变性能

采用恒速型毛细管流变仪研究分子量双峰分布聚乙烯PE-SP2520的高速挤出性能.结果表明：因分子量分布的特殊性,PE-SP2520的结晶度和熔峰温度均低于对比样品LLDPE-7047.高速挤出时PE-SP2520剪切黏度较高,非牛顿流动性较弱,入口压力降和熔体强度较高.与对比样品比较,PE-SP2520挤出稳定性好：挤出压力稳定,流动曲线连续,挤出畸变主要为鲨鱼皮畸变.流动稳定性提高的重要原因在于分子量双峰分布使分子链缠结能力下降,熔体/管壁边界应力集中效应弱.     

Expression of ipt gene driven by tomato fruit specific promoter and its effects on fruit development of tomato

Fruit specific promoter (2A12) from Lycopersicom esculentum and cDNA of isopentenyl-transferase (ipt) from Ti plasmid of Agrobacterium tumerfaciens C58 were cloned by PCR procedure respectively. Two plant expression vectors with 2A12/gus or 2A12/ipt were respectively constructed. These two chimeric genes were transferred into tomato by Agrobacterium mediated procedure. The results of Southern hybridization showed that the fusion genes had been integrated into tomatoes. The result of gus histochemical staining showed that 2A12 had high fruit specific expressive capability in transgenic tomato. The ipt expression resulted in accumulation of high level of cytokinins (CTKs) in fruit lead to developmental changes in fruits and seeds. The fruit of ipt transformed tomato had the hyperplastic placenta with very few seeds or even seedless. The shelf life of transgenic fruits elongated for 1–2 weeks. The ratio of fruit set, the dry weight of fruit and the crude protein content in fruit were increased, while the soluble sugar of fruits decreased.     

超滤法提取银杏叶和绞股蓝双中药中黄酮的研究

以银杏叶和绞股蓝为研究对象,利用超滤法对所提取物分子量大小可控的特点,从单味中药提取和双中药提取两个方面考察了银杏叶、绞股蓝两味中药中黄酮的提取效果,并优化超滤提取条件.结果表明:单味银杏叶提取物黄酮含量为4.83%,单味绞股蓝提取物黄酮含量为3.58%,银杏叶和绞股蓝双中药提取物中黄酮含量为5.76%,双中药提取物中黄酮含量明显高于单中药提取物中黄酮含量.本论文的研究为制备高含量黄酮提取物以及制备药效更好的抗心血管疾病中药提供理论基础.     

玉米自交系数量性状遗传参数研究

用数量遗传学的原理和方法,对２０个常用自选和引入的玉米自交系进行数量性状遗传参数的田间试验研究。结果表明：穗粗、行粒数、百粒重与单株产量的遗传相关达到正向极显著吐丝期、株高、穗行数、单株叶片数、单株产量的传力较高,受环境影响小,宜早代选择;单株产量的遗传进度较其余性状高,获得的遗传增量大,直接选择效果较为理想;穗粗、行粒数、百粒重以及它们所构成的选择指数对单株产量的相关遗传进度都较高,通过这３个性     

Expression of ipt gene driven by tomato fruit specific promoter and its effects on fruit development of tomato

Fruit specific promoter (2A12) from Lycopersicom esculentum and cDNA of isopentenyl-transferase (ipt) from Ti plasmid of Agrobacterium tumerfaciens C58 were cloned by PCR procedure respectively. Two plant expression vectors with 2A12/gus or 2A12/ipt were respectively constructed. These two chimeric genes were transferred into tomato by Agrobacterium mediated procedure. The results of Southern hybridization showed that the fusion genes had been integrated into tomatoes. The result of gus histochemical staining showed that 2A12 had high fruit specific expressive capability in transgenic tomato. The ipt expression resulted in accumulation of high level of cytokinins (CTKs) in fruit lead to developmental changes in fruits and seeds. The fruit of ipt transformed tomato had the hyperplastic placenta with very few seeds or even seedless. The shelf life of transgenic fruits elongated for 1-2 weeks. The ratio of fruit set, the dry weight of fruit and the crude protein content in fruit were increased, while the soluble sugar of fruits decreased.     

高聚物分子量两种测定方法对比初探

分别采用高效凝胶渗透色谱（HLGPC）法和多角度激光光散射一凝胶渗透色谱法（MALLS／GPC）法测定了分子量为10万以上氯化聚丙烯（CPP）的分子量及其分布,并据此对两种测定高聚物分子量的方法进行了初步对比分析．结果表明,两种测定方法得到的高聚物分子量相差小于1％,分布相差约2％．与传统的GPC法相比,MALLS法可获得重均分子量的绝对值,因而与GPC联用可获得更加符舍样品实际分子量分布的结果．