点叶绵枣叶片培养及器官分化的研究

点叶绵枣叶外植体培养于MS 6-BA 1 PPm IBA 0.5 ppm培养基中,一月后不定芽仅从近轴面的叶表面产生。组织学的观察表明,不定芽起源于表皮细胞。     

体外培养周期型马来丝虫感染期幼虫

关于体外培养周期型马来丝虫(periodic Brugia malayi)感染期幼虫(L_3),近年来国内外有一些报道,系应用含哺乳动物组织细胞系或原代细胞的培养系统培养彭亨丝虫和马来丝虫L_3,可使其幼虫发育至Ⅳ期蚴(L-4)或早期成虫(Chen and Howells,1979; Wong et al.,1982;Mak et al.,1983;郑惠君等,1984)。但未见应用含人体组织细胞系的体外培养系统培养布鲁属丝虫L_3的报道。本研究     

在被小泡参与突触前后膜特化增厚的形态学研究

Our object was to characterize the morphological changes of coated vesicles and synaptic membranes during synaptogenesis. Neurons from spinal cords of fetal mice were established as isolated cells in primary culture. After a few days in vitro, the neurons extended their neurites and started their interaction. At timed intervals thereafter, cultures were fixed for electron microscopic observation. Coated vesicles were prominent in the neuronal cytoplasm at the time of synaptogenesis (about 7-10 days in vitro). Similar vesicles were seen in continuity with some cisternae in the Golgi regions and there was an increase in number during the synaptogenic period. Indeed it is not established whether the coated vesicles were exocytotic or pinocytotic in nature, but the cisternae which were in continuity with coated vesicles could be labelled by glucose-6-phosphatase (G6Pase) but not by thiamine pyrophosphatase (TPPase). Such vesicles were also seen in continuity with the neuronal plasmalemma near the closest contact site and contributed their undercoating to pre- and postsynaptic densities. The formation of bilateral membrane specialization was described as being structurally similar to synaptic active zones and appeared to be the first definitive sign of synapseformation. It has been suggested that the synaptic dense material may derive wholly or in part from the exocytic coated vesicles which apparently budding off from endoplasmic reticulum cisternae. This incorporation could provide the mechanism for confining specific characteristics of neuronal membrane to the synaptic region.     

植物细胞培养的生物反应器

本文介绍了植物细胞培养的特点及其生物反应器的设计原理,概述了植物细胞悬浮培养和固定化细胞系统中各类生物反应器的传氧、混合和流体力学特性与植物细胞生长和次生代谢物生产的关系。     

向日葵离体孤雌生殖的超微结构研究

本文是研究未受精胚珠培养诱导的孤雌生殖过程超微结构变化的首次报道。向日葵(Heliaanthus annuus L.)的卵细胞在离体条件下被激活,发生细胞核移位、极性丧失、细胞器增多并转变成活动状态、液泡化程度增大、合点端形成细胞壁等一系列变化,预示即将启动孤雌生殖。孤雌生殖的原胚具有若干显著特征,如极性颠倒、有自体吞噬活动、壁的自由生长、游离核分裂等。对这些现象作了初步的讨论。