Structure and Property of Silk Fibroin ／ Cellulose Blend Film

Silk fibroin/cellulose blend films were prepared using Nmethylmorpholine-N-oxide (NMMO) as solvent. The effects of different proportions and solid contents on properties of blend films were discussed. The mechanical properties showed that the blend films had preferable moisture permeability and a high strength. The structures of the blend films were investigated by infrared spectrum and X-ray diffraction. The results indicated the occurrence of hydrogen bonds between hydroxyl groups of cellulose and amido groups of fibroin.     

滨海盐碱地铺装工程泛碱现象立体防护措施

园林工程中,石材铺装后的泛碱现象一直困扰着许多园林工作者。泛碱现象是我国滨海盐碱地地区园林铺装工程中常见现象,其直接导致石材装饰功能受到影响,降低园林景观效果。造成泛碱现象的直接原因是施工方施工不规范及监理方缺乏监管责任意识。以天津滨海地区园林铺装工程为例,从分析泛碱现象的机理与成因入手,结合铺装工程施工过程,特别是基层、结合层、面层施工要点,较系统地阐述解决泛碱现象的立体防护措施,为创造优美的园林景观效果提出建设性意见。     

Water Repellent Finishing on Cotton Fabric via Atom Transfer Radical Polymerization

In order to enhance the water repellence property of cotton fabric, cotton fabric was grafted using hexafluorobutyl methacrylate( HFMT) monomer via atom transfer radical polymerization( ATRP) method. Water repellent cotton fabric was successfully prepared, and characterized by scanning electron microscopy( SEM),Fourier transform infrared spectroscopy( FTIR), and X-ray photoelectron spectroscopy( XPS). The SEM images of the HFMT-treated cotton displayed significant difference from the untreated one. FT-IR characterization of the HFMTtreated cotton indicated that HFMT was successfully grafted onto the surface of the cotton fabric. XPS analysis indicated that the fluorine element of the HFMT-treated cotton existing on the surface of the cotton fabric. The surface contact angle test as well as the water repellence rating test showed that the water repellence of the HFMTtreated cotton fabric was much better than that of the untreated cotton fabric. The surface contact angle of the HFMT-treated cotton fabric could reach( 132. 4 ± 2. 2) °,and the water repellence rating could achieve grade 3. The washing durability of the HFMT-treated fabric was also investigated. The surface contact angle of the HFMTtreated cotton fabric could reach( 121. 1 ± 2. 1) ° after 20 washing times. Furthermore, the whiteness, air permeability, breaking strength,and breaking elongation of the HFMT-treated cotton fabric decreased slightly compared with the untreated cotton fabric.Finally,cotton fabric with good water repellence property and excellent washing durability could be obtained with little effect on the intrinsic properties of cotton fabric.     

d区单质“惰性s-价电子效应”的电位判据(Ⅱ)

本文对d区元素进行了普查 ,提出用单质s轨道的标准氧化电位来量度“惰性s -价电子效应” ,当E0 S>0 73V时 ,可作为单质具有“惰性s-价电子效应”的判据。由强到弱的顺序为 :Pt(2 6 4)、Au(1 6 9)、Rh(1 1)、Ir(1 0 )、Ru(0 95 )、Pd(0 92 )、OS(0 85 )、Hg(0 85 )、Ag(0 80 )。     

相对独立经济（法）诉讼之探讨

经济（法）诉讼在学界一直存在着颇多观点，且关于经济（法）诉讼的争论从未中断过，且随着经济（法）案件的增多，经济法案件具有法人独特性，经济法研究的深入，以及我国市场经济的发展，法治的深化，发现现有的三大诉讼并不能适用于所有经济法案件，因此相对独立的经济（法）诉讼有其探讨的必要性。     

体教结合之实证研究——湖州第一中学与湖州体育运动学校从合并到分设的调研剖析

地（市）级青少年体育运动学校是我国竞技体育后备人才培养体系中量大面广的基础环节之一.以浙江省湖州市体育运动学校与湖州市第一中学从合并到分设的过程进行个案剖析,试图以＂体教结合＂的理论视角为基础,从案例中提炼出本层次＂体教结合＂的理论规律与可行的实践操作规范,作为＂体教结合＂理论体系中一个有益的补充.     

通过叶绿体基因工程在烟草中合成中长链羟基脂肪酸聚酯

中长链羟基脂肪酸聚酯(medium-chain-length-PHAs, mcl-PHAs)属于微生物聚酯. PHA合酶(PHA synthase, 由phaC基因编码)和3-羟酰基-酰基转移蛋白-辅酶A转移酶(3-hydroxyacyl-acyl carrier protein-coenzyme A transferase, 由phaG基因编码)是mcl-PHAs生物合成途径中的关键酶. 以aadA(氨基糖苷-3′-磷酸转移酶)基因做筛选标记, 分别构建了含phaC2基因的单价叶绿体转化表达载体pTC2以及同时嵌合phaC和phaG基因的双价叶绿体转化表达载体pTGC. 通过PDS1000/He基因枪转化法转化烟草, 获得具有壮观霉素抗性的叶绿体型转基因烟草植株, PCR和Southern Blot结果表明, 外源基因确已整合进烟草叶绿体基因组中且基本达到同质化. 气相色谱法检测转基因株系中的mcl-PHAs含量最高达4.8 mg/g干重, 合成的PHAs单体主要成分为3-羟基辛酸(3-hydroxyoctanoate, 3-HO)和3-羟基癸酸(3-dydroxydecanoate, 3-HD). 透射电子显微镜观察到转基因烟草叶片叶绿体中确有PHAs颗粒累积.     

压性雁列构造变形过程中热场演化的实验研究

在实验室利用铂电阻接触测温系统和红外热像仪两种仪器,观测了含压性雁列断层结构的岩石标本在变形过程中的温度分布．两种方法的测量结果都显示了热场在时间上和空间上与应力、应变场的关系．实验显示,在岩石标本的不同构造部位的增温速率不同,反映了不同部位的应力分布不同．实验过程中标本变形可分3个阶段:弹性阶段、粘滑阶段、以及破裂阶段．温度变化过程也分为3个阶段,各阶段的温度上升速率不同,热辐射场也发生了相应的变化,反映了不同阶段的主导增温机制发生了改变．实验结果对利用卫星热红外波段资料研究断层现今活动提供了物理依据．     

Construction of Yeast Vectors with Resistance to Geneticin

IntroductionYeast Saccharomyces cerevisiae (S.cerevisiae) hasbeen widely used in molecular biology as well asinthe industrial production.Its genetic backgroundhas been well studied and a series of cloning andexpression vectors have been constructed for DNAtransformation into yeast[1 ] .The selection markersof these conventional vectors are usually H IS3 ,TRP1 ,LEU2 ,and URA3 [1 ,2 ] . These selectionmarkers are responsible for the biosynthesis ofsome amino acids and consequently the hos…