Analysis of gene expression profile of multidrug resistant MCF/DOX cell line after benflumetol derivative LY980503 treatment

AIM:To investigate the effect of LY980503(a benflumetol derivative)on multidrug resistance of tumor cell line using DNA microarray.METHODS:Total RNA was extracted from multidrug resistant MCF/DOX cell line. cDNA microarray containing 320 cDNAs was used to detect the gene expression profile.RESULTS:9 down-regulated genes and 1 up-regulated gene were identified after multidrug resistant MCF/DOX cells were treated with LY980503.CONCLUSION:LY980503 can effectively reverse the resistance of MCF/DOX to DOX in vitro by adjusting the expression of multi-genes.     

Study on relationship between expression of PKCα in glomeruli and development of nephropathy in diabetic rats

AIM:To observe the dynamic changes of expression of PKCα, TGF-β₁ and α-SMA in glomeruli of diabetic rats induced by the alloxon and to invesitigate their roles in the diabetic nephropathy(DN).METHODS:Rats were randomly divided into four groups: normal control group (group A), diabetic group of one week (group B), diabetic group of one month (group C), diabetic group of two months (group D). Immunohistochemistry and Western blotting were used to detect the expression of PKCα, TGF-β₁ and α-SMA in renal tissue of all groups. Blood glucose, triglycerides, cholesterol, creatinine and urine protein were analysed by chemical methods. The morphological changes of renal tissue were checked through microscopy.RESULTS:The expression of PKCα and TGF-β₁ in renal tissue of diabetic groups were increased comparing with those of nomal control group(P<0.05). The mesangial cells expressed α-SMA in two months group. Chronologically the expression of PKCα, TGF-β₁ and α-SMA were positively correlative with each other and the impairment of kidney was also observed.CONCLUSIONS: During the DN process the expression of PKCα increased. PKCα raised GFR and the permeability of glomerular filtration membrane which enhanced urinary albumin excretion. PKCα also increased expression of TGF-β and therefore to induce the expression of α-SMA. The appearance of α-SMA was a marker of the phenotypic transform of renal cells.     

山东烟区烟青虫和烟蚜及其天敌的发生动态

在山东烟区 ,烟蚜主要发生于 5月下旬至 6月上旬 ,烟青虫种群数量在 6月中旬至下旬较高。捕食性天敌主要有瓢虫、草蛉、食虫蝽、隐翅虫和蜘蛛 ,但是发生数量低、数量高峰明显滞后于害虫数量高峰。优势寄生性天敌有寄生于烟蚜的烟蚜茧蜂和寄生于烟青虫幼虫的棉铃虫齿唇姬蜂及中华卵索线虫。烟蚜茧蜂和烟蚜种群数量之间具有显著的相关 ,5月底到 6月中旬益害比大于或接近 1 ;齿唇姬蜂对烟青虫 1～ 3龄幼虫的寄生率 6月份为 74 0 % ,7月份为 4 9 8% ;中华卵索线虫仅发生于 7月中旬 ,对 3龄以上烟青虫幼虫的寄生率为 35 2 %。     

灰树花不同菌株液体深层培养蛋白质含量的测定

在液体培养条件下测定了发酵液中5个灰树花菌株蛋白质含量的变化。结果表明，接种后第6天发酵液中蛋白质含量最高，Gf961菌株发酵液中的蛋白质含量为0.58%，Gf962菌株发酵液中的蛋白质含量最低，为0.30%，随着培养时间的延长，发酵液中蛋白质含量逐渐下降，接种后第9天最低，随后以呈上升趋势。但上升的幅度较小。试验为确定从发酵液中提取蛋白质的最佳时期提供了一定的理论依据。     

阿魏蘑与杏鲍菇高产优质栽培模式研究

试验证明，阿魏蘑和杏鲍菇最佳栽培模式为菌棒半脱袋竖向畦栽半覆土栽培模式；最适环境条件为菇房温度13～20℃，空气相对湿度85％～95％；最佳栽培设施为半地下冬暖式塑料大棚。     

湿地松粉蚧三种寄生蜂蛹及蛹壳的比较

本文主要通过对湿地松粉蚧Oracella acuta(Lobdell)两种引进天敌迪氏跳小Zarhopalus debarri、火炬松短索跳小蜂Acerophagus coccois与本地天敌粉蚧长索跳小蜂Anagyrus dactylopii(Howard)的蛹及蛹壳的比较，指出可通过寄生蜂蛹及蛹壳的形状、颜色、羽化孔、表面结构特征等对上述三种寄生蜂进行区分。     

三元杂交牛12和18月龄肉用性能研究

选择健康无病、发育正常、膘情中等的夏洛来×西门塔尔×本地牛(夏西本)、皮埃蒙特×西门塔尔×本地牛(皮西本)、利木赞×西门塔尔×本地牛(利西本)、西门塔尔×西门塔尔×本地牛(西杂二代)各10头,从6月龄开始育肥,测定其增重、饲料消耗及其12和18月龄的屠宰成绩。结果表明:平均日增重以皮西本、利西本较高,分别为0.96kg、0.90kg,并与西杂二代差异显著(P<0.05);饲料消耗以皮西本较少,每kg增重消耗精、粗饲料分别为4.03kg和5.98kg。以皮西本和利西本2个杂交组合的屠宰成绩较好,18月龄屠宰率分别为61.50%、61.17%,净肉率分别为52.59%、49.21%。各组试验牛的高档肉块比例随着年龄的增长相应增加。     

HBV/HAV复合抗原基因在CHO细胞中的表达

为探讨HBV／HAV复合疫苗的可行性，利用DNA重组技术将HBsAg与HAW复合多表位抗原基因VPX进行融合，插入到真核表达质粒pVAX1多克隆位点，构建成核酸表达疫苗pVAX1／SVPX，将其转染CHO细胞。转染细胞培养48h后，进行RTPCR、Western-blot、ELISA分析，结果表明HBV／HAV复合抗原基因SVPX能够在CHO细胞内转录、表达，融合蛋白具有HBV和HAV抗原的特性。     

叶面喷施吲哚乙酸对油菜蕾薹期渍水的缓解效应

以油菜品种秦优7号(敏感)和苏油4号(耐渍)为材料,通过盆栽试验研究吲哚乙酸(IAA)对油菜蕾薹期渍水的缓解效应。蕾薹期渍水持续10d,渍水结束后,叶面喷施浓度为0.1mmol/L的IAA,随后的0~15d调查油菜的生理变化。结果发现:渍水后生物量和叶片光合色素含量降低;谷胱甘肽、抗坏血酸含量和超氧化物歧化酶活性升高;丙二醛含量升高;蔗糖合成酶、蔗糖磷酸合成酶活性上升,蔗糖和可溶性糖含量增加。渍水结束后喷施IAA,对敏感的秦优7号缓解效应更明显;叶片中的光合色素含量升高,5d后显著恢复生长;蔗糖磷酸合成酶活性降低,降低蔗糖含量;蔗糖合成酶活性降低,减少蔗糖的分解;尤其是喷施15d后IAA对渍水胁迫的缓解作用最明显,苏油4号根干重显著增加,而秦优7号的根干重和茎干重均显著增加。叶面喷施IAA有效缓解单株角果数、每角粒数和产量的降低,但对抗氧化系统影响较小。     

常见计算机病毒的防范

分析了计算机常见的四种病毒,根据其固有特点提出了相应的防范方法及建议。