MCM—41中孔分子筛的全微波辐射快速合成

采用正硅酸乙酯（ＴＥＯＳ）作硅源,十六烷基溴化铵（ＣＴＡＢｒ）作为模板剂,首次通过全微波辐射法合成了ＭＣＭ－４１中孔分子筛,用ＸＲＤ,ＴＧ,ＩＲ和ＳＥＭ等实验技术进行了表征．结果表明,此法合成时间短,晶化只需１０～１５ｍｉｎ,焙烧脱模也仅需１ｈ左右．本实验条件下,所得分子筛晶粒分布均匀,晶形以球状为主,晶粒大小约为１０μｍ．全微波辐射合成法,具有工艺简单,操作方便,省电节能,产品收得率高等特点．它可能为ＭＣＭ－４１中孔分子筛的快速合成,探索出一条新的途径．     

负载型高分子金属配合物的制备及其催化H2O2分解性能研究

以介孔分子筛MCM-41作载体制备了Cu()-壳聚糖(CS)高分子金属配合物为活性组分的催化剂Cu-CS/MCM-41,并利用红外光谱和低温N2吸附等手段研究了催化剂的结构特征.结果表明,Cu-CS/MCM-41催化剂的比表面积为208.6 m2/g,平均孔径和孔容分别为2.3 nm和0.27 cm3/g.将Cu-CS/MCM-41用于催化过氧化氢分解反应,当温度为20℃,pH=4.5,反应液体积为60.0 mL,H2O2的初始浓度为0.1443 mol/L,Cu-CS/MCM-41催化剂用量为0.100 0 g等条件下,反应24 h,H2O2的分解率可达84%.催化剂显示具有模拟过氧化氢酶(CAT)的作用,而且可多次重复使用,并有较稳定的催化活性.同时分别考察了温度、H2O2的浓度、pH值、反应时间及Cu-CS/MCM-41催化剂的用量等对Cu-CS/MCM-41催化性能的影响规律.     

Metal cation sensing material based on the assembly of meso-terakis（ 4-N,N,N- trimethylamiophenyl） porphyrin and mesoporous molecular sieve MCM-41

The metal cation sensing material was prepared by entrapment of a water-soluble porphyrin compound, rnesoterakis（4-N,N,N-trimethylamiophenyl） porphyrin （TTMAPP）, in mesoporous molecular sieve MCM-41. The powder X-ray diffraction （XRD） spectra results demonstrated that after the introduction of TTMAPP, the ordered channel arrangement of MCM-41 remained. The assembly material, TTMAPP/ MCM-41, exhibited a typical absorption feature of porphyrin compound. Emission spectrum study revealed that the introduction of zinc （Ⅱ） cation resulted in the formation of a new emission peak at 600 nm for TTMAPP/MCM-41, while the presence of copper （Ⅱ） cation at low concentration led to that the luminescent intensity of TTMAPP/MCM-41 was obviously reduced by 68.42%. The experiment results demonstrated that TTMAPP/MCM-41 is a cation sensing materials with good performance.     

Biological function of HIV-1 transmembrane protein gp41──A study on a putative cellular receptor of gp41

Since 1992, the study of biological functions of HIV-1 gp41 has made great progress. Experimental evidence from several research groups demonstrated that gp41 has a putative cellular receptor. A recombinant soluble gp41 (aa539-684) and gp41 immunosuppressive peptide (aa583-599) could bind to human B lymphocytes and monocytes, but weakly bind to T lymphocytes. It was found that gp41 contains two cellular binding sites (aa583-599 and 641-675). GP41 could selectively inhibit cell proliferation of human T, B lymphocytes and monocytes, enhance human MHC class Ⅰ, Ⅱ and ICAM-1 molecule expression on cell surface. Gp41 binding proteins and a monoclonal antibody against the first binding site could inhibit this modulation effect. Amino acid sequence homology exists between gp41 and human type Ⅰ interferons, and the homologous region is located in the first binding site on gp41 and in the receptor binding site on type Ⅰ interferons. Studies in other groups indicate that both binding sites in gp41 may be associated with HIV infection of cells. Peptides containing two binding sites could respectively inhibit HIV infection of cells. A monoclonal antibody recognizing the second binding site could neutralize lab-strains and recently separated strains of HIV-1. Besides, antibodies against two regions (homologous with gp41 binding sites) of SIV transmembrane protein gp32 could protect macaques from SIV infection. These results suggest that the study of gp41 binding sites and cellular receptor could contribute to understanding the mechanism of HIV infection and to developing HIV vaccine and anti-HIV drugs.     

中钨矿离子交换结晶制备（NH4）10W12O41工艺研究

研究了从中钨矿压煮液,中用强碱性阴离子交换树脂除杂的最佳条件,并结晶制备高纯度仲钨酸铵（NH4）(10)W(12)O(41)。所得工艺条件为：料液PH10．44,最大穿漏交换容量W03190．83mg／g干树脂,交换PH10．38,水洗剂0．10mol／LNH4Cl,淋洗剂0．25mol／LNH4Cl-氨水。同时对钨的淋洗解吸效益进行了分析。     

中孔MCM—41分子筛晶化过程的初步研究

在含阳离子表面活性剂－十六烷基三甲基溴化铵的碱怀水热体系中,考察了在３７３Ｋ,３９８Ｋ,４２３Ｋ和４７３Ｋ下合成中孔ＭＣＭ－４１分子筛的晶化动力学曲线及引入晶种对其合成的影响,并用ＸＲＤ,ＳＥＭ,ＩＲ及ＴＧ／ＤＴＡ等测试手段对其晶化期间中孔骨架我变化进行了表征。实验结果表明,随晶化过程的进行,产物中孔孔道结构的有序度在不断提高,但在原子水平上却始终缺乏严格的晶序,提高晶化温度,晶化速率明显加快,但     

一个同余式的简单证明

给出了下列同余式的一个简单证明∑ｐ－１ｋ＝１１ｋ２ｋ≡∑（ｐ－１）／２ｋ＝１（－１）ｋ－１ｋ（ｍｏｄｐ）．     

柴油深度加氢脱硫催化剂载体全硅MCM-41的合成

考察了水热合成反应条件对全硅MCM-41结构、结晶度的影响和产物的热稳定性。研究发现：改变合成母液的PH会改变MCM-41的孔径大小;在无氧条件下高温处理的最佳温度为600℃左右;所合成的全硅MCM-41具有很高的比表面积、均匀的孔径和较好的热稳定性,可用做制备加氢脱硫催化剂的载体。     

粟酒裂殖酵母snR41 snoRNA的鉴定及其结构进化的意义

采用计算机分析和分子生物学实验的方法,在粟酒裂殖酵母Schizosaccharomyces pombe中发现和鉴定了一种新的反义snoRNA,命名为snR41,与酿酒酵母Sacharomyces cerevisiae snR41同源分子比较,粟酒裂殖酵母snR41只具有一个指导rRNA核糖甲基化的反义序列,这一发现进一步揭示了反义snoRNA同源分子在一级结构上的多样性,为研究反义SnoRNA结构及进化提供了新的线索。     

Cu-酞菁配合物在MCM-41中的装载研究

合成了具有柔性取代基的2(3),9(10),16(17),23(24)-四-(N,N-二乙胺基乙氧基)Cu-酞菁配合物,并且装载到MCM-41中。利用UV-Vis-Nir,FT-IR,XRD,TEM,FESEM及N2吸附-脱附等温线对制备的样品进行了表征。研究表明:制备的Cu-酞菁配合物能够装载到MCM-41中;较高浓度的Cu-酞菁配合物在MCM-41中的装载,有利于制备结晶度及孔道有序性较高的介孔分子筛样品。