聚氯乙烯等温燃烧反应动力学

聚氯乙烯等温燃烧反应动力学;PVC;燃烧反应;化学动力学     

桑树花药培养获得单倍体植株

本文取花粉发育为单核至单核靠边期的花药,接种于脱分化培养基,28℃黑暗培养15日,后每日用2000 Lux光照12h,35日后形成胚状体,其诱导率可达13.6％;当胚状体长至3mm,颜色开始转绿后转移至分化培养基,分化绿苗率可达37.21％;在苗高2—3cm时于基部切下,置发根培养基处理2—4日后转移至无激素培养基培养,发根率可高达95％以上;胚状体的染色体数均为单倍体(n=14),经植株幼叶染色体鉴定,成功地获得了桑树单倍体值株。     

In vitro PRODUCTION OF HAPLOID PLANTS FROM MULBERRY (Morus) ANTHER CULTURE

Anthers with pollen during the uninucleate to late uninucteate stages are inoculated into dedifferentiation medium, cultured at 28℃ in the dark for 15 days, and then placed under the illumination of 2000 lux 12 h a day. After 35 days, embryoids arc induced, the induction frequency reaching 13.6％. On greening, the embryoids about 3 mm in diameter are transferred to differentiation medium, and the regeneration percentage of plantlets is 37.21％. Plantlets about 2—3 cm in height are transferred first to a rooting medium for 2—4 days, then to a hormoneless medium. The formation frequency of roots is up to 95％. Chromosome examination shows that all embryoids are haploid, and the haploid plant is very successfully induced from mulberry anther culture.     

南昌市城区416名儿童锌缺乏状况调查

为了解南昌市城区儿童锌缺乏状况，采集手指尖末梢血20μL用石墨炉原子吸收分光光度法测定全血锌浓度。以血锌值5.00μg/mL为正常下限。结果表明，该儿童人群血锌值呈非正态分布，样本中位数为5.659μg/mL，四分位数间距为Q3－Q1＝1．927。416名2－8岁儿童中男240人，女176人。锌缺乏人数134人，锌缺乏患病率35．80％。不同性别间血锌值无显著差异，而不同年龄间血锌值有显著差异，但未表现出与年龄呈正相关关系。提示南昌市城区儿童锌缺乏的发生率较高，应引起人们足够的重视。     

照相影像微结构分析仪PIS软件研制

为了使照相影偈微结构分析仪各装置之间能协调一致地完成指定的操作,并进行各种数据处理,特在微型计算机上开发出一套专用系统软件,简称ＰＩＳ软件,详细介绍该软件的设计原理、基本结构、主要功能及技术特点。