从边缘到主流：美国的越裔文学

美国越裔文学很大程度上是越南战争的结果。本文围绕越南战争给美国越裔带来的深重灾难和身份危机,以越裔族群为主要关注点,探讨越裔文学中的战争和身份主题。通过梳理国内外越裔文学研究现状,提出:随着1.5代越裔作家的不断壮大和优秀越裔作品的出现,越裔文学开始迈入美国文学正典化进程,同时越裔文学研究正在成为亚裔文学研究的新生力量。国家社科基金一般项目“美国少数族裔文学与国家认同研究”(16BWW076

Effect of Loading Content of Silver on Lithium Storage for TiO2 Net-Work Flexible Film Electrode

采用水热法结合银镜反应制备出一系列不同Ag负载量(2.2%、4.0%、6.4%,; w/w)改性的3D纳米网状结构Ag@TiO_2薄膜电极。利用电感耦合等离子体技术(ICP)、X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(; TEM)和X射线能谱(EDX)等表征手段测试所合成材料的形貌及成分,实验结果表明Ag纳米颗粒可以成功沉积在TiO_2纳米线表面。电化学测试数据则; 表明,4.0%(w/w)负载量的Ag@TiO_2相比于未改性和其他负载量的TiO_2纳米线具有更好的倍率性能和更稳定的可逆容量。在50,100,; 200, 400, 800和1 200 mA·g~(-1)的电流密度条件下,该改性电极的放电容量可分别达到261.4,253.7,239.5,; 216.5, 193.1和185.1 mAh·g~(-1),在200 mA·g~(-1)下循环80次后容量保持率仍能达到99.8%。A series of silver-modified TiO(2)flexible film electrodes with hierarchical 3D nano-network structure are facilely synthesized using hydrothermal method followed via the traditional silver mirror reaction. Successful deposition of Ag nanoparticles on to the TiO2 nanowires surface is confirmed by inductively coupled plasma (ICP) technique, X-ray diffraction (XRD), scanning electron microscope (SEM) with energy-dispersive X-ray analysis (EDX) and transmission electron microscopy (TEM). The electrochemical properties of the Ag@TiO2 nanowires were researched in this work. Our results show that the Ag@TiO2 nanowires with 4.0% (w/w) silver exhibits a better rate performance and more excellent reversibility than pristine one. At different current densities of 50, 100, 200, 400, 800 and 1 200 mA . g(-1), the discharge capacities of the Ag@TiO2 electrodes are 261.4, 253.7, 239.5, 216.5, 193.1 and 185.1 mAh . g(-1), respectively. After 80 cycles at 200 mA . g(-1), its discharge capacity retention is 99.8% indicating Ag@TiO(2)electrodes are potentially useful for LIBs.国家自然科学基金(N0.51604132）资助项目

银负载量对网状TiO柔性薄膜电极储锂性能的影响

采用水热法结合银镜反应制备出一系列不同Ag负载量（2.2%、4.0%、6.4%,w/w）改性的3D纳米网状结构Ag@Ti O2薄膜电极。利用电感耦合等离子体技术（ICP）、X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）和X射线能谱（EDX）等表征手段测试所合成材料的形貌及成分,实验结果表明Ag纳米颗粒可以成功沉积在Ti O2纳米线表面。电化学测试数据则表明,4.0%（w/w）负载量的Ag@Ti O2相比于未改性和其他负载量的Ti O2纳米线具有更好的倍率性能和更稳定的可逆容量。在50,100,200,400,800和1 200 m A·g的电流密度条件下,该改性电极的放电容量可分别达到261.4,253.7,239.5,216.5,193.1和185.1 m Ah·g,在200 m A·g下循环80次后容量保持率仍能达到99.8%。国家自然科学基金(No.51604132)资助项目

Domestication of the high-sugar-tolerant Mortierella alpina on arachidonic acid(ARA) production

通讯作者：Tel: 86-592-2186038; : [email protected][中文摘要]【目的】提高花生四烯酸(Arachidonic acid,ARA)产量,克服ARA产生菌高山被孢霉(Mortierella alpina)在长期的保存及使用过程中易受到外界条件影响发生退化,从而导致菌种耗糖量降低、影响菌种摄入营养的能力和不利于工业化生产的缺点。【方法】首先采用固体培养基驯化,将菌种逐级涂布于梯度高糖PDA平板(含糖量分别为2%、5%、7%、10%和15%)培养,挑选经固体驯化后能耐受10%高糖浓度平板的菌种,转接到两种含不同氮源的梯度高糖(含糖量分别为3%、4%、5%和6%)液体培养基中进行驯化,最后对驯化后的菌种进行2 L发酵罐放大实验。【结果】当培养基中以酵母粉为氮源时,驯化后菌体的最高耗糖量由3 g/(L.d)提高到12 g/(L.d);当培养基中以玉米浆为氮源时,驯化后菌体的最高耗糖量由7 g/(L.d)提高到12 g/(L.d)。摇瓶驯化实验结果表明以玉米浆为氮源驯化的菌种发酵效果较好,发酵罐实验结果显示菌体生物量为50 g/L,总油脂为18 g/L,目的产物ARA产量为8 g/L。相比未驯化之前的发酵结果,生物量和总油脂含量提高了近3倍,ARA产量提高了近4倍。【结论】经过高糖驯化, 菌种的耗糖能力得到提高, 生物量、总油脂及ARA 的产量也都有所增加, 从而可以使菌种在保存和使用过程中不易退化,保持稳定。[英文摘要][Objective] In order to improve arachidonia acid(ARA) production,and prevent the degeneration of ARA-producing strain Mortierella alpina in long-term culture preservation and cultivation,which could lead to low consumption rate of substrates like carbon source.[Methods] Mortierella alpina strain was first domesticated in high-sugar PDA plate with gra-dient sugar content(2%、5%、7%、10% and 15%).The strain which grew better in the solid medium containing 10% sugar was then selected and transferred to two liquid high-sugar media with different nitrogen sources to domesticate. The gradient sugar contents were 3%、4%、5% and 6%, respectivlely. Finally, the domesticated strain was used to produce ARA in a 2 L bioreactor. [Results] The experimental results show that the consumption of sugar increased from 3 g/(L·d) up to 12 g/(L·d) in the medium with yeast extract, and from 7 g/(L·d) up to 12 g/(L·d) in the medium with corn steep liquor. After cultivation for 144 h in a 2 L bioreactor,the yield of ARA reached 8 g/L, which was 4 times higher than that obtained with the original strain. [Conclusion] The domestication of the high-sugar-tolerant Mortierella alpina increased the consumption of sugar, biomass, total fatty acid and ARA production. The domesticated strain could maintain the high sugar resistance in the preserving process and turn to be more stable.福建省科技厅重大专项项目(No.2010NZ0001-4);; 国家自然科学基金项目(No.31071488

Practices on Cultural Construction in Experimental Chemistry Demonstration Center

根据国家级厦门大学化学实验教学示范中心的建设特点,从实验室环境文化、制度文化、管理文化和精神文化多个方面入手建设实验室文化的实践进行总结与分享。This paper summarized our practices on cultural construction in chemistry laboratory including laboratory environment, rules, management and spirit based on the characteristics of our center.国家基础科学人才培养基金(J1210014);; 2016年度教育部“基础学科拔尖学生培养试验计划”研究课题;; 福建省高等学校教学改革研究项目(JAS14634

Synthesis of Ru(dpp)_3(ClO_4)_2 doped polyacrylonitrile nanoparticles and its applications in ratiometric pH sensing

采用乳液聚合法制备了掺杂有4,7-二苯基-1,10-邻菲咯啉钌(ru(dPP)3(ClO4)2)的聚丙烯腈纳米颗粒(ru-PAn).经扫描电子显微镜(SEM)表征,制备的ru-PAn的尺寸为135±15 nM,呈规则球型,尺寸分布均匀且在水中的分散性较好.实验考察了氧气、共存离子和PH值对其荧光性质的影响以及其荧光稳定性.以异硫氰根荧光素(fITC)为PH荧光指示剂、ru-PAn为参比信号,初步建立了一种比率荧光PH检测的方法.In this paper Ru(dpp)3(ClO4)2 doped polyacrylonitrile nanoparticles(Ru-PAN) were prepared using emulsion polymerization method.Morphology characterizations of the nanoparticles were performed using scanning electron microscope,the particle diameter was about 135±15 nm.The interference of the oxygen,coexisting ions,pH and photo-stability were investigated.A new ratiometric fluorescence pH sensing system was established via fluorescein isothiocyanate(FITC) as pH-sensitive dye and Ru-PAN as a reference.国家自然科学基金资助项目(20975085

hrHPV DNA载量 分型和E6蛋白对宫颈癌前病变进展的预测作用

目的:探讨预测高危型人乳头瘤病毒(high risk human papillomavirus,hrHPV)阳性和宫颈上皮内瘤样病变1级(cervical in-traepithelial neoplasia grade 1,CIN1)妇女进展的生物学标志物。方法:2010年10月至2012年8月在山西省、河南省和江西省招募7 543名妇女,采用hrHPV DNA检测和E6蛋白检测(Onco E6)等方法进行宫颈癌筛查,任一结果阳性者转诊阴道镜并取活检,于1年后随访。纳入基线hrHPV阳性或病理诊断CIN1者。结果:共纳入794例满足条件妇女,1年后88例妇女病理级别发生进展。基线hrHPV DNA中高载量者进展的风险是低载量者的2.9倍(95%CI为1.8~4.8),hrHPV16/18/45、E6蛋白阳性者进展的风险分别是阴性者的2.4倍(95%CI为1.5~3.9)、2.9倍(95%CI为1.5~5.9),其进展至宫颈上皮内瘤样病变2级及以上(cervical intraepi-thelial neoplasia grade 2 or worse,CIN2+)的绝对风险分别为4.9%(95%CI为3.2~7.4)、9.0%(95%CI为5.5~14.3)、18.8%(95%CI为10.2~31.9)。hrHPV16/18/45中高载量且E6蛋白(Onco E6)阳性妇女进展的绝对风险高达32.4%(11/34)。结论:hrHPV DNA中高载量、hrHPV16/18/45分型以及E6蛋白(Onco E6)可作为妇女hrHPV阳性和CIN1进展的生物学标志物,特别是hrHPV中高载量且E6蛋白(Onco E6)阳性妇女,临床应给予密切随访。中国医学科学院医学与健康科技创新工程重大协同创新项目(编号:2016-I2M-1-019)资助~

如何精准做好化学教学实验室的建设

主要介绍了厦门大学化学国家级实验教学示范中心在实验室细化建设方面的具体做法,如实验室的给排水、供配电、通风等系统工程和实验家具的精准设计和精准施工,以期更好地为国内高校化学教学实验室的细化设计和细化建设提供适应面广、操作性强的可借鉴经验。2016年度教育部“基础学科拔尖学生培养试验计划”研究课题;;2017年福建省本科高校教育教学改革研究项目(FBJG20170295);;2017年度厦门大学教学改革研究项目(JG20170204);;国家基础科学人才培养基金项目(J1310024

The Preparation of Silver Nanoparticles

［中文文摘］在简要介绍纳米银在各个工业领域应用的基础上,总结比较了各种制备纳米银颗粒的方法。物理和化学方法的工艺技术都比较成熟,但也存在着一定的不足。新兴的生物还原法因其具有微生物原料来源广,生物还原反应条件温和,产物纳米颗粒不易团聚,以及过程加入的化学试剂和产生的有毒副产物少等特点而开始受到关注。微生物还原金属离子有2种不同的机理:微生物的酶催化机理和非酶还原机理。对生物还原法原理的充分认识是将该方法发展成为可实际应用的纳米银制备工艺的重要基础。［英文文摘］The main applications of silver nanoparticles in industry were briefly reviewed in the present paper. The methods used for preparation of silver nanoparticles were summarized and compared. The physical and chemical methods are relatively mature but they have some shortcomings. The biological method is recently developed as a promising method because of its special advantages such as sufficient material sources, mild reaction conditions, good dispersion of nanoparticles as well as few chemical addictives and poisonous byproducts. The biological method for preparation of silver nanoparticles included two mechanisms, namely enzymatic catalysis mechanism and non-enzymatic reduction mechanism. The full understanding of two mechanisms would be necessary for developing it into a practical process to prepare silver nanoparticles.国家自然科学基金(20376076); 中国石油化工股份有限公司项目(0041-K81042)

长汀县赢坪史前遗址发掘简报

2012年福建博物院对赢坪两处遗址进行了抢救性考古发掘,获得了一批包括石器、陶器、铜器、石范等内涵丰富的文化遗物,这批遗物可进一步了解闽西地区的史前文化发展序列及文化面貌,并且对于多地区文化间的交流研究也有一定的作用