α,β,γ,δ-四苯基卟啉的合成及其在高效液相色谱中的应用

合成并提纯了α，β，γ，δ－四苯基卟啉（ＴＰＰ），通过元素分析及一维、二维核磁共振波谱分析确证了化合物的结构。研究了与其有关的理化性质，并将ＴＰＰ用作柱前螯合试剂配以高效液相色谱法实现了Ｃｕ２＋、Ｚｎ２＋、Ｎｉ２＋的同时测定。     

Construction of recombinant industrial Saccharomyces cerevisiae strain with bglS gene insertion into PEP4 locus by homologous recombination

The bglS gene encoding endo-1,3-1,4-β-glucanase from Bacillus subtil＆ was cloned and sequenced in this study. The bglS expression cassette, including PGK1 promoter, bglS gene fused to the signal sequence of the yeast mating pheromone a-factor （MFals）, and ADH1 terminator with G418-resistance as the selected marker, was constructed. Then one of the PEP4 allele of Saccharomyces cerevisiae WZ65 strain was replaced by bglS expression cassette using chromosomal integration of polymerase chain reaction （PCR）-mediated homologous recombination, and the bglS gene was expressed simultaneously. The recombinant strain S. cerevisiae （SC-βG） was preliminarily screened by the clearing hydrolysis zone formed after the barley β-glucan was hydrolyzed in the plate and no proteinase A （PrA） activity was measured in fermenting liquor. The results of PCR analysis of genome DNA showed that one of the PEP4 allele had been replaced and bglS gene had been inserted into the locus of PEP4 gene in recombinant strains. Different endo-1,3-1,4-β-glucanase assay methods showed that the recombinant strain SC-βG had high endo-1,3-1,4-β-glucanase expression level with the maximum of 69.3 U/（h·ml） after 60 h of incubation. Meanwhile, the Congo Red method was suitable for the determination of endo-1,3-1,4-β-glucanase activity during the actual brewing process. The current research implies that the constructed yeast strain could be utilized to improve the industrial brewing property of beer.     

重铬酸吡啶盐作用下烯丙基甾醇的氧化反应研究

在不同的反应条件下,用重铬酸吡啶盐（PDC）氧化豆甾醇,分别得到以豆甾-4,22-二烯-6β-羟基-3-酮或豆甾-4,22-二烯-3,6-二酮为主的产物。结果与有关文献的报道有所不同。     

α,β-不饱和氨基酸酯类化合物的合成与表征

以芳香醛、乙酰甘氨酸、马尿酸等为原料合成了8种噁唑酮类化合物,然后经催化醇解反应,以62.5%~94.1%的收率得到α,β-不饱和氨基酸酯类化合物,并利用核磁共振谱(~1H NMR、~(13)C NMR)表征了产物的分子结构.研究了反应温度、催化剂及取代基的不同对产物收率的影响.结果表明,化合物3在100℃,100%(mol/mol)无水乙酸钠催化下反应最佳,吸电子取代基更有利于该反应.化合物4在室温条件下三乙胺催化反应效果最佳.     

Tensile deformation behavior of a solution-treated Ti-33Nb-4Sn alloy with a dual β and α" phases under cyclic loading-unloading

The cyclical tensile deformation behavior of a solution-treated(ST) Ti-33Nb-4Sn alloy with a dual β and α "phases was investigated in this study.Experimental results indicated that the ST Ti-33Nb-4Sn alloy exhibited different deformation behavior during two different loading-unloading cycles,and that the deformation behavior was closely related to the characteristics of stress-induced martensitic(SIM) transformation,mainly including the extent and the reversibility of SIM transformation.During the first cycle,the extensive and incompletely reversible SIM transformation occurred,resulting in notable "double yielding" during loading and residual permanent strain after unloading.In the second cycle,however,a slight and reverse SIM transformation,together with pure elastic deformation,taken place concurrently,giving rise to a recoverable nonlinear deformation behavior.Our results also imply that by tailing the characteristics of SIM transformation,the Ti-based alloys with a mixture of α" and β phases might perform recoverable deformation and possess a promising potential for engineering applications.     

关于子基的半分离空间

本文首先给出关于子基的半Ti（i=0,1,2）、半正则和半正规空间的定义及其等价刻画,并证明关于子基的半Ti（i=0,1,2）在关于子基的同胚开映射下保持,而关于子基的半正则（正规）在关于子基的同胚连续开映射下保持.     

依那普利对高糖诱导的大鼠肾小球系膜细胞增殖及分泌TGF-1β、LN的影响

目的 观察依那普利（Ena）对高糖诱导的大鼠肾小球系膜细胞（GMCs）增殖及分泌转化生长因子-β1（TGF-β1）和层粘连蛋白（LN）的影响.方法 大鼠GMCs分别培养于正常浓度葡萄糖（NG,5.5mmol/L）、高浓度葡萄糖（HG,20mmol/L）及高糖和不同浓度（10-7mol/L、10-6mol/L、10-5mol/L）的Ena中,同时设空白对照.分别采用四甲基偶氮唑蓝（MTT）法和酶联免疫吸附试验（ELISA）、放射免疫法（RIA）检测不同时间（24 h、48 h、72 h）GMCs增殖情况和细胞培养上清液中TGF-β1、LN的含量.结果 与空白对照组比较,正常糖组和高糖组GMCs增殖增加,TGF-β1、LN分泌增多（P〈0.001）,高糖组更明显（P〈0.001）.与高糖组比较,高、中、低浓度的Ena干预均可逆转上述变化.且在一定浓度范围内,Ena无明显细胞毒性.结论 高糖可致GMCs增殖和TGF-β1、LN分泌增多,Ena可抑制高糖诱导的GMCs增殖与分泌TGF-β1、LN,这可能是其减少细胞外基质（ECM）积聚的机理之一,并有利于延缓糖尿病肾病肾小球硬化（GS）的进展.     

羟丙基-β-环糊精修饰纳米碳管载钯催化剂的制备及其甲酸氧化性能

以羟丙基-β-环糊精(HP-β-CD)为添加剂修饰碳纳米管为复合载体,常温常压下,成功合成了Pd纳米簇状结构,并用于甲酸的电催化氧化.XRD及TEM结果表明,制备出的Pd纳米簇状结构由粒径均匀,约为3.6nm的纳米颗粒组成,且高度分散沉积在载体表面.循环伏安测试结果表明,催化剂Pd/HP-β-CD-MWCNTs对甲酸氧化表现出了较高的催化活性和电化学比表面积.研究表明,在HP-β-CD存在条件下,将Pd纳米簇沉积在未作处理的碳纳米管上制备的催化剂适合应用于甲酸燃料电池.     

黑曲霉的紫外诱变及酸性蛋白酶缺陷株的选育

以黑曲霉3.2130为出发菌株,经紫外线诱变处理,采用平板培养筛选,获得一酸性蛋白酶缺陷的菌株L4。通过对紫外照射时间、照射距离、孢子悬液稀释倍数的影响分析,得出最佳诱变条件,即照射时间180 s,照射距离30 cm,孢子液中孢子数量约为109个/L。该株的酸性蛋白酶活性为原始菌株的3.7%,而其β-葡萄糖苷酶活性基本不变,可作为外源基因高效分泌表达的宿主菌。