槐果碱对人红白血病K562细胞的增殖抑制和诱导凋亡作用

研究了槐果碱对人红白血病细胞株K562的增殖抑制和诱导细胞凋亡的作用，应用流式细胞仪进一步观察槐果碱对K562细胞周期的影响。结果表明：槐果碱对K562细胞生长有明显的抑制作用，且这种抑制作用呈浓度依赖性、时间依赖性。细胞经0．8g／L、1．0g／L的槐果碱作用48h后，即呈现典型的细胞凋亡形态学变化，作用72h后DNA凝胶电泳出现片段的梯形条带。流式细胞仪分析显示，用1．0g／L槐果碱使K562细胞阻滞于G0／G1期，作用72h后G0／G1细胞比例由38．0％上升到56．2％。槐果碱对人红白血病细胞K562的增殖具有明显的抑制作用，并能诱导其发生凋亡。     

鲤鱼消化道组织学及组织化学研究

采用组织学、组织化学方法研究鲤鱼消化道，结果表明：消化道的各个部位普遍存在粘液细胞，肠中存在丰富的绒毛，粘膜层柱状上皮之间有少量杯状细胞；肛门中含大量肛门腺，这些是鲤鱼与摄食有关的重要适应性特征．     

草鱼生长激素基因在COS7细胞中转染表达的研究

应用RT-PCR技术克隆草鱼生长激素(gcGH)的cDNA,将此cDNA定向插入真核表达载体VR1020中,构建成重组真核表达质粒VgcGH.利用脂质体法使质粒VgcGH转染哺乳动物细胞COS7,对转染后的COS7细胞进行RT-PCR、ELISA和免疫荧光检测,分别在转录和翻译水平证实gcGH基因在COS7细胞中得到了持续和正确的转染表达.     

3H-TdR掺入法检测镉致鲫外周血单个核细胞的增殖抑制

以Cd2 浓度1.25、2.503、.75 mg.kg-1腹腔注射染鲫后,用3H-胸腺嘧啶脱氧核苷掺入法研究镉对鲫外周血单个核细胞(PBMC)增殖的影响.检测鲫PBMC的增殖.结果显示:1.25 mg.kg-1组与对照组在不同时间放射性活度(dpm)的差异均无显著性;0d和3d时各染镉组与对照组dpm的差异均无显著性;5d时2.50 mg.kg-1及3.75 mg.kg-1组与对照组及1.25 mg.kg-1组dpm的差异有显著性且呈剂量效应,7d和10d时dpm与5d时基本相同;14d时3.75 mg.kg-1组与其余组dpm的差异有显著性,但已出现缩小的趋势.因此低浓度Cd2 对鲫PBMC增殖的影响不大,高浓度Cd2 则能诱导鲫PBMC增殖抑制.     

Proliferation and differentiation into endothelial cells of human bone marrow mesenchymal stem cells （MSCs） on poly DL-lactic-co-glycolic acid （PLGA） films

Autologous, allograft and synthetic vessels currently used in clinical vessel replacement have many defi- ciencies, especially in the area of small caliber vessel replacement. The supply of autologous arteries or veins may not be sufficient or suitable fo…     

Nitric oxide mediates the fungal elicitor-induced Taxol biosynthesis of Taxus chinensis suspension cells through the reactive oxygen species-dependent and -independent signal pathways

Taxol (paclitaxel, NSC-125973), a secondary me- tabolite of the Taxus species, has been recognized as one of the best anticancer drugs emerging in the last decade[1]. The production of Taxol by various Taxus spp. cells in culture has been one of the most …     

DNA synthesis in exocrine and endocrine pancreas after partial hepatectomy in Syrian golden hamsters

Summary ³H-thymidine autoradiography showed an enhanced DNA synthesis, in acinar and islet cells of pancreas after partial hepatectomy in syrian golden hamsters. A significant nuclear labeling index of acinar cells was observed between 48 and 84 h and reached control levels by 120 h. An increased labeling index of islet cells was also observed, however, this increase was not statistically significant. These results indicate growth factor(s) produced after partial hepatectomy is capable of inducing DNA synthesis in pancreas.This work is supported by NIH grant CA 36043.     

N~ P常规硅太阳电池退火效应的研究

研究了扩散成结后的退火处理对N~ 常规硅太阳电池性能的影响,结果表明退火处理能够提高太阳电池的转换效率,550℃左右退火后效率达到峰值;初步认为550℃左右的退火处理可使太阳电池基区和耗尽区内某种“基本”的深能级复合中心密度大幅度减小并使某些“非基本”的深能级复合中心消失,从而可恢复太阳电池基区少子扩散长度,减小耗尽区复合电流密度,提高太阳电池的转换效率。     

Retinoic acid enhances the proliferation of smooth muscle cells

Summary Retinoic acid (RA, 10^–5–10^–7 M) is shown to enhance the proliferation of cultured rat aortic smooth muscle cells (SMC). This effect is not connected with a synergistic action of RA together with serum mitogens. Moreover, the expression of L1, a surface antigen specific for modulated SMC entering the cell cycle, is amplified by RA treatment.     

小型静、动两用双层薄膜压力盒的研制

作者研制了一种在土中和挡土结构中量测静、动应力和压力的双层薄膜式小型压力盒,并在专门的设备上进行了砂压、气压和液压三种方法的静态标定及附加质量块和不附加质量块的动态标定。标定结果表明:双膜式压力盒比国内常用的单膜式压力盒具有可靠、稳定和受压板的变位量小而灵敏度高等优点。因其体积小特别适用于静、动土压力的模型试验之中。