顶空单液滴微萃取-气相色谱法测定水中苯系物

采用顶空单液滴微萃取样品处理方法分离富集水中苯系物,用气相色谱法进行测定.考察了不同萃取剂、萃取条件对检测结果的影响.苯、甲苯、对二甲苯的检出限分别为0.05,0.05,0.03 μg·L-1,三种苯同系物的相关系数分别为0.999 2,0.998 5和0.997 2,回收率分别为98.3%,101.9%和97.3%.     

Ag改性纳米ZnO薄膜及光催化活性

采用溶胶-凝胶法和光还原沉积贵金属法结合制备出Ag改性的纳米ZnO薄膜。利用FESEM、XPS、ESR、UV-Vis分析了纳米Ag-ZnO薄膜的表面形貌、表面组成和光谱特征。FESEM分析表明银在纳米ZnO薄膜表面形成原子簇而没有形成均匀覆盖层。XPS分析表明负载在纳米ZnO薄膜表面的银以Ag⁰形式存在; 相对于纳米ZnO薄膜, 纳米Ag-ZnO薄膜中晶格氧的含量有所下降,而表面羟基氧和吸附氧的含量显著增加。纳米Ag-ZnO薄膜的ESR峰强比纳米ZnO薄膜大,表明纳米Ag-ZnO薄膜中束缚单电子的氧空位的浓度高于纳米ZnO薄膜。UV-Vis分析纳米Ag-ZnO薄膜的紫外可见吸收光谱可能是纳米银粒子与纳米ZnO薄膜共同作用的结果。以甲基橙为模拟污染物,考察了纳米Ag-ZnO薄膜的光催化活性以及银沉积量对催化剂活性的影响。光催化降解结果表明,银的沉积量为0.018 2 mg·cm^-2的纳米Ag-ZnO薄膜的光催化活性最高,在紫外光照射3 h后甲基橙降解率约为78%,而纳米ZnO薄膜约为62%。     

大肠杆菌中高丝氨酸琥珀酰基转移酶的同源模建与对接研究

利用同源模建和分子动力学模拟方法,模建了大肠杆菌中高丝氨酸琥珀酰基转移酶的三维结构.分析了活性位点的组成,从结构上佐证了Cys142而不是Lys47为亲核进攻的残基,并通过与其天然底物琥珀酰-辅酶A的对接研究,从理论上确认了对复合物形成起到重要作用的氨基酸残基.     

两个哒嗪衍生物为配体的铜(Ⅱ)配合物的合成、晶体结构和清除自由基活性

本文合成了2个新型Cu(Ⅱ)配合物：[Cu₂(L₁)₂Cl₄]L₁ (1)和[Cu(L₂)₂(NO₃)₂(H₂O)] (2),其中L₁为3,6-二(苯并三唑-1-)哒嗪,L₂为3-(1,2,4-三氮唑-1-)-6-氯哒嗪。配合物1的晶体属于三斜晶系,P1空间群。铜离子与3个氯原子和配体的2个氮原子形成五配位的四角锥构型,2个氯原子以μ-2方式桥联2个中心铜原子。在配合物1的晶胞中1个游离配体未参与配位。配合物2的晶体属于单斜晶系,C2/c空间群。铜原子处于五配位四角锥配位环境中。分子间氢键将2的分子结构延伸为一维链、二维网状结构,并通过分子间的π-π堆积作用进一步使配合物构型发展成三维拓扑结构。应用邻苯三酚自氧化法对本文所涉及的化合物进行了清除自由基活性测试,结果表明：这2个配体都具有较好的活性。     

聚乙烯/石墨层间化合物热降解过程的TG-FTIR研究

将含磷化合物插层石墨层间化合物(GIC)用于聚乙烯(PE)的阻燃,采用氧指数(LOI)方法评价了PE/GIC的阻燃性能,并采用热分析-红外光谱联用技术(TG-FTIR)研究了PE/GIC的热降解过程,探讨了GIC的阻燃机理。研究表明,不同含磷化合物插层GIC阻燃聚乙烯的氧指数有显著差别,其中以多聚磷酸铵-GIC的阻燃效果较好,氧指数较高。TG-FTIR研究结果表明,GIC并未显著影响PE的热降解方式,但由于GIC体积膨胀所发生的氧化还原反应导致部分PE热降解提前并发生热氧化降解,促进了后期成炭的石墨化过程。     

碳酸钙晶须合成过程中可溶性磷酸盐的作用机理研究

以可溶性磷酸盐为控制剂,一步碳化法制备了文石相碳酸钙晶须。借助于XRD和FTIR,分析了可溶性磷酸盐在碳酸钙晶须合成过程中的作用机理。研究结果表明：通入CO₂进行碳化反应前,可溶性磷酸盐与Ca(OH)₂反应生成了热力学上最稳定的磷酸钙化合物——羟基磷灰石;在通入CO₂初期,[CO₃^2-(OH)]进入到羟基磷灰石的晶格,部分替代[PO₄^3-],生成碳酸羟基磷灰石,然后以此为结晶中心诱导文石相的异相成核,Ca²⁺、CO₃^2-不断叠加,进而生长为碳酸钙晶须。     

豆甾醇分子印迹聚合物的合成及性能研究

以豆甾醇(stig.)为印迹分子、甲基丙烯酸甲酯(MMA)为功能单体、二乙烯基苯(DVB)为交联剂、碳酸钙及十二烷基硫酸钠(SDS)混合物为分散剂、过硫酸钠为引发荆、极性较低的甲醇(tolu.)为致孔剂,采用悬浮聚合法合成豆甾醇分子印迹聚合物.并对试验合成的分子印迹聚合物的形貌、粒径及选择吸附性能分别采用高效液相、电镜和光学显微镜进行分析和评价.试验结果表明,最佳配方为3g stig.:40mL MMA:15mL DVB:4g CaCO3 2g SDS:0.4mLNa2S2O8:14mL tolu.,其中引发荆过硫酸钠应分多次加入,在聚合反应初期采用高速搅拌,随着聚合反应的进行搅拌速度应逐渐减小.该条件下合成的分子印迹聚合物平均粒径小于100μm、分布较窄,对豆甾醇表现出快速和稳定的特异吸附性能,其分离因子超过1.65,吸附容量约为1.2mg/g.     

An Injectable Integration of Autologous Bioactive Concentrated Growth Factor and Gelatin Methacrylate Hydrogel with Efficient Growth Factor Release and 3D Spatial Structure for Accelerated Wound Healing

Growth factors are essential for wound healing owing to their multiple reparative effects. Concentrated growth factor (CGF) is a third-generation platelet extract containing various endogenous growth factors. Herein, a CGF extract solution is combined with gelatin methacrylate (GM) by physical blending to produce GM@CGF hydrogels for wound repair. The GM@CGF hydrogels show no immune rejection during autologous transplantation. Compared to CGF, GM@CGF hydrogels not only exhibit excellent plasticity and adhesivity but also prevent rapid release and degradation of growth factors. The GM@CGF hydrogels display good injectability, self-healing, swelling, and degradability along with outstanding cytocompatibility, angiogenic functions, chemotactic functions, and cell migration-promoting capabilities in vitro. The GM@CGF hydrogel can release various effective molecules to rapidly initiate wound repair, stimulate the expressions of type I collagen, transform growth factor β1, epidermal growth factor, and vascular endothelial growth factor, promote the production of granulation tissues, vascular regeneration and reconstruction, collagen deposition, and epidermal cell migration, as well as prevent excessive scar formation. In conclusion, the injectable GM@CGF hydrogel can release various growth factors and provide a 3D spatial structure to accelerate wound repair, thereby providing a foundation for the clinical application and translation of CGF.     

Defluorination and Mineralization of Difluorophenols in Water by Anodic Contact Glow Discharge Electrolysis

Anodic contact glow discharge electrolysis (CGDE) is a DC-excited atmospheric pressure discharge, in which a steady non-thermal plasma is generated locally between the surface of an electrolytic solution and an anode in contact with it. The I–U characteristics of CGDE were investigated. The plasma temperatures were estimated to be in the range, 1373–2045 K. Hydroxyl radicals and hydrogen peroxide were the main oxidants generated by CGDE. The hydrogen peroxide concentration reached 31.2 mmol/L (mM) in a phosphate buffer solution without organic substrates. During CGDE, the DFPs and the corresponding total organic carbon (TOC) in water were consumed. Most of the fluorine atoms in the DFPs were converted to fluoride ions, and the fluoride concentration increased steadily. An analysis of the hydroxylation of DFPs suggested that the hydroxyl radicals generated by CGDE were the key species responsible for the degradation of DFPs, and the possible mechanistic routes of the mineralization of DFPs are proposed. The disappearance of DFPs and the TOC as well as the defluorination of the DFPs followed first-order kinetics. The rate of TOC disappearance was relatively constant: 1.00 ± 0.05 × 10^?2 min^?1. The order of disappearance of the DFPs was 2,6-DFP > 2,3-DFP > 2,5-DFP > 2,4-DFP > 3,4-DFP > 3,5-DFP. In contrast, the order of defluorination of the DFPs was 2,5-DFP > 2,3-DFP > 2,6-DFP > 2,4-DFP > 3,4-DFP > 3,5-DFP. Overall, the order of the reaction rates for each DFP was k_DFP > k_dF > k_TOC.     

一类Block型李代数的分类和中心扩张

本文我们决定了一类Block型李代数$\BB$在同构意义下的分类和中心扩张, 其中$q$是一个非零复数. 我们的结果推广了以前的一些结果.