木材硅石改性剂的制备工艺   总被引：1，自引：0，他引：1  

石媛  吕文华  刘强强 《东北林业大学学报》2020,(2):104-108

为了降低木材硅化改性成本促其应用,直接将固态硅石粉高效液态活化,通过正交试验和极差分析优化制备了木材硅石改性剂,测试分析了浸渍改性杨木的性能。结果表明:①反应时间和原料n(SiO2)∶n(NaOH)对活化溶液的pH值、黏度和密度影响不显著,碱料种类和反应温度对活化溶液的黏度、密度、SiO2转化率、固体质量分数和生产成本影响显著,对溶液性能综合影响最大的是反应温度和碱料种类,其次是n(SiO2)∶n(NaOH)和反应时间;②pH值随反应时间、温度和n(SiO2)∶n(NaOH)增大而减小,密度、黏度、固体质量分数、SiO2转化率和模数随反应时间、温度和n(SiO2)∶n(NaOH)增大而增大,KOH活化效果更好但价格较高,综合平衡优化工艺为:反应温度200℃、碱料为NaOH、n(SiO2)∶n(NaOH)=1.715∶1、反应时间4 h;③硅石改性剂能充分渗入杨木,使其吸药量达252%,密度提高81%,抗弯强度提高69.6%,炭化温度减小89℃,残炭率提高41%,改性效果优于硅溶胶。  相似文献   

Effect on Expression of SUMO-1 in Cells Infected by Brucella and Construction of Lentivirus Vector that Over-expressing SUMO-1     

LI Qi-feng  DING Jin-hua  DOU Wen-jing  ZHANG Hui  CHEN Chuang-fu 《中国畜牧兽医》2016,43(6):1422-1429

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Silicon content in rice seedlings to protect rice blast fungus at the nursery stage   总被引：1，自引：0，他引：1  

Tsuyoshi Hayasaka  Hiroshi Fujii  Tsuneo Namai 《Journal of General Plant Pathology》2005,71(3):169-173

To control rice blast effectively at the nursery stage, the absolute SiO₂ content necessary for rice plants to resist blast disease was investigated using various rice cultivars and soils. Nine rice cultivars with different complete resistance genes and different degrees of partial resistance were grown on nursery soils amended with silica gel at different rates to change the SiO₂ content of rice plant. The rice seedlings were then inoculated 28 days after sowing with Pyricularia grisea to estimate their blast resistance. In all rice cultivars, the number of lesions was significantly reduced when SiO₂ content increased in the rice seedling; lesions were reduced to 5%–20% of the number on the seedlings grown in soil without silica gel when the seedling SiO₂ content reached 5%. Additionally, the susceptibility to blast disease of rice seedlings grown on eight soils collected from different districts, with varying amounts of silica gel, was compared. The number of lesions decreased significantly when the SiO₂ content in the seedlings reached 5%. These results suggest that SiO₂ content of at least 5% in the rice plant can control this disease at the nursery stage under any conditions.  相似文献   

Overexpressed human FAT10 protein induces the apoptosis in the starved HEK293 cells     

LIU Ya-wei  LIU Jing-hua  XIE Ru-jia  LI Zhi-jie  WANG Guo-jun  HUANG Shao  TANG Jing  ZHAO Ming-zhe  SUN Xue-gang  DENG Peng  JIANG Yong 《园艺学报》2007,23(10):1937-1941

AIM: To study the effect of human FAT10 on the apopotosis of HEK293 cells using flag-tagged human FAT10 protein.METHODS: The fragment of FAT10 gene was cloned into the pcDNA3-flag vector,which was identified by PCR,enzyme digestion and sequencing.The reconstructed plasmids were transfected into HEK293 cells.The expression of introduced FAT10 in the normal cultured and starved cells was detected respectively by Western blotting.XTT assay and DNA ladder method were used to analyze the effect of FAT10 on the apoptosis of starved HEK293 cells.RESULTS: The reconstructed plasmids were highly expressed in HEK293 cells with different expression mode at the mormal cultured and starved state.The livability of starved FAT10 overexpressed HEK293 cells was significantly lower than that of normal cultured cells.DNA ladder was observed in the starved FAT10 overexpressed cells,but not in the normal cultured cells.CONCLUSION: The eukaryotic expressed plasmids of flag-tagged FAT10 were constructed successfully,and highly expressed in HEK293.Overexpressed FAT10 enhances the apoptosis in the starved HEK293 cells.  相似文献   

BS-CTMAB复配修饰膨润土对苯酚的吸附   总被引：13，自引：8，他引：5  

李彬  孟昭福  王建涛  马麟莉  许绍娥  杨淑英 《农业环境科学学报》2014,33(6):1131-1138

采用两性表面修饰剂十二烷基二甲基甜菜碱(BS-12)和阳离子表面修饰剂十六烷基三甲基溴化铵(CTMAB)复配修饰膨润土,通过批处理法研究了不同修饰比例、温度、pH和离子强度等条件下,复配修饰膨润土对苯酚的吸附规律和热力学特征,并探讨了其吸附机制。结果表明,CTMAB复配修饰显著增强了两性修饰膨润土对苯酚的吸附能力,30℃时吸附量呈现100BS+100CT(100%BS-12+100%CTMAB)100BS+50CT(100%BS-12+50%CTMAB)50BS+100CT(50%BS-12+100%CTMAB)100BS+150CT(100%BS-12+150%CTMAB)50BS+50CT(50%BS-12+50%CTMAB)100BS+25CT(100%BS-12+25%CTMAB)50BS+150CT(50%BS-12+150%CTMAB)50BS+25CT(50%BS-12+25%CTMAB)100BS(100%BS-12)50BS(50%BS-12)CK(原土)的顺序。当CTMAB复配修饰比例在0~100%CEC时,两性复配修饰土样对苯酚的吸附量随着修饰比例的增大而升高,而在100%~150%CEC阶段,吸附量则随CTMAB修饰比例的增大有所降低;修饰土样对苯酚吸附量随着温度、pH的升高而降低,在低浓度范围内,随着离子强度的增大而升高。Henry模型适用于描述苯酚在供试土样的吸附,供试土样对苯酚的吸附属于自发的物理吸附过程,吸附呈现焓减、熵增特征。  相似文献   

乌津原油加剂改性试验研究     

毛婉茹  曹金水 《油气储运》1998,17(2):56-56,60

采用中国石油天然气管道科学研究院研制的ＧＹ型流动性改进剂，对哈萨克斯坦的乌津原油进行了加剂改性的试验研究。加剂后改善了原油的低温流动性，在２５℃时测定的凝点为１０．５℃，凝点降低２２．５℃，粘度降低了９６．９％，为乌津原油外运方案的设计奠定了基础。  相似文献   

原油加剂改性的影响因素     

李锦昕 《油气储运》1999,18(9):32-35

研究了苏丹原油加剂时的处理温度、处理中的温升、原油含水量、处理过程听轻组分的挥发等因素对加剂处理效果的影响。研究结果表明，对于高凝点、高粘度的苏丹混合原油，随着处理温度的升高，原油粘度降低幅度增大；在原油处理过程中，温度回升将抑制化学剂的改性效果；原油中水含量减小，加剂生效果明显；在非密闭处理装置中，原油轻质组分的挥发是影响加剂改性效果的重要因素之一，特别在慢降温处理过程中影响更大。  相似文献   

塞曼石墨炉原子吸收法直接测定硼的方法研究     

陈二钦  黎耿碧  罗兰 《广西农业生物科学》1991,(2)

采用 Sr-Ni-Al-Mg 混合液为基体改进剂,研究了塞曼石墨炉原子吸收法直接测定硼的方法.试验表明,使用本混合基体改进剂,抗干扰能力强,大大挺高硼的吸收信号,线性范围较宽(0.2～10μg/mLB),并且在线性范围内彻底消除了硼的记忆效应.方法的特征量为100pg/0.0044A·S.  相似文献   

竹纤维增强聚丙烯复合材料的研究   总被引：10，自引：0，他引：10  

李正红 《福建林学院学报》2005,25(3):197-201

研究了竹纤维增强聚丙烯复合材料的力学性能、热学性能、加工性能,采用电镜扫描分析了复合材料的界面及其微观结构.用多元统计分析中的主成分分析法,合理地确定竹纤维增强聚丙烯复合材料多项性能指标兼优的最佳纤维含量.  相似文献   

英语短语动词的三要素——以away组成的含gradually之义的短语动词为例     

赵静云 《安徽农业大学学报》2003,(6):124-128

从语义的角度来对短语动词进行系统地认知是一种科学的新理念、新方法。以短语动词中的副词或介词为主线来进行纵向的组群亦是切实可行的一种好方法。然后在横向上辨析相关的同义的短语。以三者的有机结合所形成的复合思维来加以认知则更具特色。由away组成的短语动词可表数个意义。含“gradually”之义时,所表意义为动状关系。  相似文献