共查询到17条相似文献,搜索用时 46 毫秒
1.
蚕豆萎焉病毒2号侵染豌豆的细胞病理变化 总被引:1,自引:1,他引:0
蚕豆萎蔫病毒 (Broadbeanwiltvirus ,BBWV)是豇豆花叶病毒科 (Comoviriadae)蚕豆病毒属(Fabavirus)的代表种 ,其寄主范围很广 ,可侵染 4 4个科 186属中的 32 8种植物[1] ,是我国豆科作物、蔬菜作物、中草药、花卉、烟草及一些木本植物上的重要病毒病原。国际病毒分类委员会 (ICTV)第六次报告中已将原先的两个血清型划定为两个种 ,即蚕豆萎蔫病毒 1号 (BBWV1)和蚕豆萎蔫病毒 2号(BBWV2 ) ,在我国广泛发生的都是BBWV2 ,尚未分离到BBWV1。自 1994年起 ,周雪平等系统研究了BB… 相似文献
2.
3.
4.
赤星病菌感染烟草植株的细胞病理研究 总被引:1,自引:0,他引:1
赤星病菌感染烟草植株的细胞病理研究张仲凯,陈惠明,方琦,冉邦定,李云海,李月秋,管仕军,何云昆,吴自强(云南农科院生物技术研究所,昆明650223)(云南烟草科学研究所)(云南大理州经作所)烟草赤星病菌[Alternariaalternata(Fre... 相似文献
6.
甘薯羽状斑驳病毒和甘薯褪绿矮化病毒复合侵染甘薯引起的细胞病理学研究 总被引:2,自引:0,他引:2
2011~2012年在浙江杭州连续发现感病甘薯植株具有甘薯病毒病SPVD的典型症状,透射电镜观察发现其叶片包含有长度为600—900nm,直径为12nm的线状病毒粒子。使用特异性引物进行RT—PCR扩增及测序,其病原为甘薯羽状癍驳病毒(Sweet potato feathery mottle virus,SPFMV)和甘薯褪绿矮化病毒(Sweet potato chlorotic stunt virus,SPCSV)复合侵染。运用透射电镜研究SPVD引起的细胞病理学变化,观察到叶肉细胞的细胞质中含有马铃薯Y病毒属特征性柱状内含体,其结构分类为Ⅳ型;线状病毒样粒子以束状平行排列成聚集体的方式存在于细胞质中;叶绿体伸出伪足状结构包裹线粒体。在维管束细胞的筛管和伴胞中观察到弯曲线状病毒样粒子形成的聚集体,其粒子排列交错,与叶肉细胞中平行排列的病毒样粒子聚集体不同,符合毛形病毒属特征。另外还在维管束和叶肉细胞结合的部位发现复合侵染的细胞病理学特征。本研究表明危害甘薯生产的SPVD已扩散蔓延到浙江省。 相似文献
7.
8.
两种对虾杆状病毒的超微结构比较及其超微细胞病理的观察 总被引:2,自引:0,他引:2
应用透射电和超薄切片技术,对长毛对虾和斑节对虾的杆状病毒病进行研究。在对虾幼体发育的糠虾期之前的各期虾苗未查到病毒,而在糠虾期之后各期的肝胰腺和中肠上皮细胞核中的均查到大量典型的病毒及其包涵体。两种对虾感染的病毒大小、形态相似, 同一种病毒,该病毒属杆状病毒科A亚组。病毒颗粒呈杆状,多见单囊模,少数似见有两层囊膜,病毒颗粒单个散要廖质和包涵体基质中,由核心、衣壳和囊膜一部分组成,核衣壳大小约(39 相似文献
9.
目的:观察慢病毒载体转染离体兔角膜基质细胞的有效性及对细胞活性的影响。方法:转染组用慢病毒携带增强型绿色荧光蛋白(Lentivirus-enhanced green fluorescent proteins,Lenti-EGFP)转染细胞,对照组则加入空白培养液,在不同感染复数(multiplicity of infection,MOI)及感染后不同时间段在倒置荧光显微镜下观察绿色荧光蛋白的表达情况并计算转染率;RT-PCR检测EGFP mRNA的表达;MTT比色法和流式细胞技术(Flow cytometer,FCM)检测病毒对细胞增殖和凋亡的影响。结果:Lenti-EGFP转染细胞后从48h开始可见绿色荧光,在MOI=500时,转染后第5天转染率可达51%;RT-PCR检测转染组有EGFP的mRNA表达;MTT结果显示在MOI为1~500时,漫病毒不影响细胞的增殖;在MOI=500时,FCM检测慢病毒载体对细胞凋亡无影响。结论:慢病毒载体可以在体外稳定有效转染兔角膜基质细胞且不影响细胞活性,是角膜基质细胞理想的基因转染载体。 相似文献
10.
11.
12.
13.
超声治疗前后外阴白色病变的超微形态比较研究 总被引:7,自引:0,他引:7
目的:了解超声治疗对外阴白色病变患处上皮细胞及真皮组织超微结构形态的影响。方法:30例患者分别做治疗前及治疗后3—6月的外阴皮肤组织活检,用光镜和透射电镜观察。结果:治疗前,表皮显示不同程度的上皮增生或萎缩并伴过度角化;细胞间隙增大,桥粒减少;细胞内黑色素颗粒减少,线粒体内室肿胀和局部胞质溶解;黑色素细胞少见;真皮内毛细血管减少,管腔多呈皱缩状;表皮及真皮内常见淋巴细胞浸润。治疗后,病变皮肤组织呈不同程度恢复,表皮细胞排列整齐,桥粒及胞质内黑色素颗粒均有不同程度增加,基底层常见黑色素细胞;真皮内成纤维细胞多见,毛细血管增多且管腔形态正常;浸润的淋巴细胞明显减少。结论:超声治疗可使患处上皮细胞及真皮组织的超微结构和色素代谢趋于恢复正常。 相似文献
14.
提出了一种基于激光的Raman -Nath衍射和光干涉进行纳米级测量的光机电一体化的新方法 ,分析了数字鉴相、A/D变换和X/Y驱动的特点 ,并对测量精度进行了扼要地分析用激光加电场进行育种研究 ,发现静电场和激光的作用效果是不相同的。这反映了它们与生物组织的相互作用机制的差异。本文用量子力学对此差异进行了解析分析 ,并与育种试验结果进行印证。得出电场辐照种子 ,可降低蛋白质分子的能级 ,增加种子的生物活性 ;激光辐照种子 ,有可能使DNA的构象发生变化 ,从而引起一定程度上的变异 相似文献
15.
High-quality lead sulfide (PbS) thin films were synthesized by chemical bath deposition from two baths with different compositions. One of them (bath-І) contained an aqueous solution of lead acetate, thiourea, sodium hydroxide, and the second (bath-ІІ) had additional triethanolamine. The introduction of triethanolamine reduced the grain size and increased the optical band gap of the PbS nanoparticles. The structure, morphology, and optical properties of the obtained films were investigated and compared with respect to the deposition time. X-ray diffraction data were used to obtain the crystallite size, lattice constant, and strain of the films. Atomic force microscopy results show that the roughness and rms-surface slope of the samples obtained from bath-I (PbS-I) were higher than those of bath-II (PbS-II) samples. PbS thin films with high reflectance (~61%) in the near-infrared region, which is important in our solar system, were obtained. The band gap, extinction coefficient, and refractive index of the samples were calculated. Furthermore, Raman analysis was performed and electrical properties of the samples were studied. 相似文献
16.
IntroductionFerrofluidswithpotentialapplicationinphysics,chemistry,biology ,medicineandotherfieldshasattractedmuchattention[1~ 4 ] .Magneticultra fineparticleswithnano scaleweredispersedinbaseliquidformativecollidedsysteminordertomakesuspension .Thethreaddeg… 相似文献
17.
Comparative studies on ac/dc mobility due to the reduced dimensionality of spatially confined low dimensional systems, at the heterojunctions of GaAs/A1xGa(1−x)As and GaxIn(1−x)As/InP forming quasi-two dimensional (Q2D) and quasi-one dimensional (Q1D) systems have been made. The effect of various low temperature nonphonon scattering mechanisms such as ionized impurity, alloy disorder scattering and surface roughness scattering mechanisms; and phonon scattering mechanisms such as acoustic phonon via deformation potential and piezoelectric scattering mechanisms on the systems has been studied. It is found that the surface roughness scattering mechanism dominates in Q2D system whereas acoustic phonon scattering mechanism dominates in Q1D system due to which the nature and magnitude of the temperature dependent dc/ac mobility curves shows significant variation. Whereas, it is observed that the confinement does not change the nature of the frequency dependent real and imaginary parts of ac mobility curves. However, the mobility is found to be enhanced with effective mass and also due to the confinement, i.e. the mobility for Q1D system is higher than that for Q2D system. 相似文献