适乐时悬浮种衣剂防治小麦纹枯病、全蚀病

10 %适乐时悬浮种衣剂 (ｆｌｕｄｉｏｘｏｎｉ)是诺华公司最新开发生产的种子处理杀菌剂。为验证其防治小麦纹枯病、全蚀病等小麦种传、土传病害和促进幼苗生长、增加产量等特点 ,我们于 1999年秋在玉田县虹桥镇围里村进行了适乐时悬浮种衣剂种子包衣防病试验 ,现将试验结果报告如下。1　材料与方法适乐时用量为 2 0 0ｍｌ/ 10 0ｋｇ种子 ,以小麦拌种剂 17%多福悬浮剂 (ｃａｒｂｏｆｕｒｏｎｔｈｉｒａｍ ,天津北方种衣剂中试厂 )为对照药剂并设空白对照 ,小区面积4 0 0ｍ2 ,重复 2次 ,小区随机区组排列。小麦品种为京 4 11冬小麦 ,试验地土…     

通过大量培育昆虫细胞生产天敌病毒

本文简述了利用病毒防治害虫的现状.介绍了笔者用含天然物的无血清培养基大量培养甘蓝夜蛾细胞,以及用这种细胞系生产核多角病毒的方法及研究现状.     

细胞快速,简易冻存法

将ＰＫ－１５和ＳＴ细胞通过普通冰箱冷藏室（４℃）１５分钟；普通冰箱冷冻室（－４℃）５分钟，低落曙冰箱（－２０℃）２０分钟；气态液氮３０分钟后沉入液氮中，经一段时间后复苏，冻存细胞状态良好。全部冻存过程在７０分钟内完成，比常规冻存方法节省时间，简便易行。     

Isolation and Identification of a Variant Porcine Epidemic Diarrhea Virus and the Immune Efficacy of Its Inactivated Vaccine

This study was aimed to isolate a mutant strain of porcine epidemic diarrhea virus and prepare a PEDV inactivated vaccine with high valence by suspension culture process for immunizing against PEDV effectively in China.200 small intestines and theirs contents of diarrhea piglets died of diarrhea,collected from many large-scale pig farms in China,were detected by RT-PCR and sequenced,a mutant strain of porcine epidemic diarrhea virus was selected and put on the suspension-cultured Vero cells in a 2 L reactor for virus isolation and continuous cell culture,the harvested virus suspension,which was identified and determined TCID₅₀,was inactivated by formaldehyde and mixed with aluminum hydroxide gel adjuvant to prepare PEDV inactivated vaccine.After its physical behavior,stability viscosity,sterility test were checked out,the safety and immune efficacy were studied by immunizing the pregnant pigs and theirs piglets.The results were as follows:86 samples were detected positive in 200 samples,cytopathy occurred after the mutant strain samples screened were passaged to 5th generation,the virus suspension was harvested in 10th generation and identified as a mutant strain of PEDV,named PEDV-GF10 strain.The virus titer of harvested virus suspension was measured up to 1×10^8.0 TCID₅₀/mL after concentrated.After the vaccine was checked out,the sows,40 and 25 days before delivery in experimental groups,were injected into Xuehai acupoint with 4 mL vaccine and the pigs in blank group were free of immunifications.The results showed that there were no obvious differences in the production status of the sows in experimental groups and blank group and the temperature of theirs 3-day-old healthy piglets injected different doses of vaccine,and the vaccine was safe to the sows and piglets.Forty 3-day-old piglets producted by pregnant sows in experimental groups and blank group were randomly selected and taken 4 mL 1×10^8.0TCID₅₀/mL F10 virus culture.The PEDV morbidity of piglets in blank group was 100% after injection and the antibodies were negative;10% piglets in blank group had mild diarrhea symptoms,the protection rate was up to 90%,antibody of passive immunity in piglets lasted for more than 35 days.Virus titer of mutant strain of PEDV-GF10 improved a lot by suspension cell culture,the PEDV-GF10 inactivated vaccine was safe,and could effectively prevent and control the variation strain of PEDV in China.     

弓形虫两种保种方法的试验

目的寻求一个简便、适宜的弓形虫保种方法。方法采用不同温度的冷冻保存法和细胞培养保存法对弓形虫保存进行了试验研究,为深入研究弓形虫提供保证。结果弓形虫在液氮(-196℃)、-70℃能长期保存,4℃能保存14 d。通过细胞培养能获得大量的弓形虫滋养体,对培养细胞的选择性不强。结论两种保种方法保存后弓形虫毒力不变。     

大脑皮质神经元培养中胰蛋白酶消化分离技术的探讨

为探讨大脑皮质神经元培养中胰蛋白酶消化分离法的最佳条件, 取新生大鼠大脑皮质组织，在不同的胰蛋白酶消化条件下分离培养神经元，通过细胞形态观察以及染色计数比较不同消化条件对神经元活性的影响。结果表明，0.25％胰蛋白酶，37℃，5 min消化分离的神经元活性较好，细胞产率也较高。在新生大鼠大脑皮质神经元培养时，采用0.25％胰蛋白酶，37℃，5 min可消化分离到单层、生长活性较好的神经元。     

应用噻唑蓝法初步研究兔外周血单个核细胞转化的条件

应用噻唑蓝法研究了ＰＨＡ－Ｐ引起兔外周血单个核细胞（ＰＢＭＣ）转化的最适条件,培养时间为４８ｈ,ＰＢＭＣ密度为５×１０１２／Ｌ,ＰＨＡ－Ｐ的终浓度为０．５ｍｇ％。并测定了在此最适条件下的吸光值（ＯＤ）,为０．２７６±０．１４２。     

夏堇悬浮细胞培养与植株再生研究

以夏堇品种“小丑”的组培苗幼嫩叶片为试材,进行愈伤组织诱导、细胞悬浮培养及植株再生诱导的研究.结果表明:MS+1.0 mg/L 6-BA+0.1 mg/L2,4-D的培养基能够使叶片诱导为生长迅速、质地疏松的愈伤组织.愈伤组织最适宜的悬浮培养条件为:MS+ 1.0 mg/L6-BA+0.1 mg/L 2,4-D液体培养基,20 g/L的起始接种量以及100 r/min的震荡培养.将继代3～4次的细胞悬浮颗粒转到1/2MS+1.0 mg/L 6-BA+0.1 mg/L NAA的固体再生培养基上培养,3周后可以诱导分化出芽,进而获得完整植株.悬浮培养有利于夏堇愈伤组织的再生,悬浮培养对提高以夏堇作为模式植物进行的相关研究具有重要的应用价值.