微生物吸附-化学还原法合成金钯纳米线机理研究

采用微生物吸附-化学还原法,以大肠杆菌(ECCs)为模板、十六烷基三甲基溴化铵(CTAB)为保护剂、抗坏血酸(AA)为还原剂制备金钯纳米线(Au-PdNWs),考察不同金钯摩尔比对合成金钯纳米材料的影响,并通过SEM、TEM、XRD等技术进行了表征,研究其形成机理。结果表明,吸附还原作用使ECCs在短时间内还原生成了少量Pd(0)和Au(0),大量的钯离子和金离子聚集在ECCs表面周围;还原剂AA的加入使ECCs表面成为优先成核位点,菌体表面基团与晶核相互作用阻止其迁移;在CTAB的作用下,菌体表面的纳米颗粒逐渐形成链状纳米中间结构,中间结构通过Ostwald熟化作用进一步形成Au-Pd纳米线。通过ECCs和CTAB协同作用,有利于一维纳米结构的生长。福建省教育厅中青年教科研项目(JAT171117);;莆田市工业科技类科研项目(2016G2020

基于电子鼻的慢性胃炎气滞证患者常见病位的口腔呼气气味图谱研究

目的:运用电子鼻探讨慢性胃炎气滞证患者常见病位的口腔呼气气味图谱特征。方法:采用证素辨证的方法,筛选出397例慢性胃炎气滞证患者并判断病位证素,同时运用基于阵列式气体传感器技术的医用电子鼻(EN0l1103-A)采集其口腔呼气的气味图谱,选择气味图谱响应曲线的振幅、斜率作为图谱特征参数,借助分类器算法对慢性胃炎气滞证与非气滞证的口腔呼气气味图谱特征进行模式识别,比较慢性胃炎气滞证患者常见病位的口腔呼气气味图谱特征。结果:慢性胃炎气滞证的主要病位证素分布是胃(91.18%)、脾(38.29%)、肝(23.68%);主要病位为胃、脾胃、肝脾胃、肝胃;采用分类器算法对慢性胃炎气滞证的气味图谱进行模式识别时,运用随机森林算法,对气滞证的准确率可以达到65.85%;病位胃组、脾胃组的气味图谱响应曲线B、C、D、E、F、I、J的振幅均显著低于病位肝脾胃组(P<0.01);病位胃组、脾胃组的气味图谱响应曲线C、D、E、F、I的斜率均显著低于病位肝脾胃组(P<0.01),脾胃组曲线A的斜率低于病位肝脾胃组(P<0.05)。结论:运用电子鼻结合模式识别方法可初步判断慢性胃炎气滞证及其不同病位间的口腔呼气气味差异。国家自然科学基金项目(No.81373552);;福建省自然科学基金项目(No.2014J01362);;福建省中医药科研项目(No.wzpw201313);;福建省教育厅A类项目(No.JA14212);;载人航天领域预先研究项目(No.020104)~

醇溶型无机锌车间底漆的电化学行为研究

使用电化学方法对2种不同的醇溶型无机锌车间底漆进行了研究,结合浸泡以及盐雾的实验结果,发现2种车间底漆中锌含量对阴极保护时效有影响,但不是决定车间底漆防锈能力的唯一因素,锌含量与防锈颜料对于车间底漆的防锈性能有协同效果。其中,锌粉在早期提供阴极保护的作用,而防锈颜料在后期对基底提供防锈保护。对于锌粉含量相对较高的车间底漆,锌粉并不是从一开始就全部参加阴极保护作用,而是一部分具有激活潜力的锌粉在另一部分锌粉率先反应之后才由\"未激活状态\"转变为\"激活状态\"进而提供阴极保护的作用

水杨酸的抑酶与抑菌作用

以水杨酸为效应物,研究其酶学效应和微生物效应.实验结果表明:水杨酸对马铃薯多酚氧化酶有明显的抑制作用,半抑制率(IC50)为2.05 mmol/L,抑制作用表现为非竞争性的可逆过程,其抑制常数为2.00 mmol/L.水杨酸对大肠杆菌、金黄色葡萄球菌、枯草芽孢杆菌3种细菌和白色假丝酵母、黑曲霉两种真菌均有明显的抑制作用,其最小抑菌浓度(M IC)分别为0.75、0.5、0.5、0.25和0.75 mg/mL,最小杀菌浓度(MBC)分别为0.75、1.0、0.5、0.25和0.75 mg/mL.本研究为水杨酸在果蔬保鲜中的应用提供实验理论依据

Effects of NaCl Stress on Photosynthesis of Three Bamboos

采用盆栽试验法,对花叶唐竹(SInObAMbuSA TOOTSIk f.luTEOlO-AlbO-STrIATA)、小琴丝竹(bAMbuSA MulTIPlEX‘AlPHOnSE-kArr’)和刺黑竹(CHIMOnObAMbuSA nEOPurPurEA)进行不同浓度盐(nACl)胁迫(Ck、0.1%、0.3%、0.5%、0.7%、1.0%)处理,用美国lI-COr公司生产的lI-6400便携式光合作用分析系统测定其各项光合作用相关指标,分析研究其中重要的4项指标:净光合速率(Pn)、气孔导度(gS)、胞间二氧化碳浓度(CI)和蒸腾速率(E),以探究nACl胁迫对3种竹子叶片光合作用的影响。结果表明:低盐胁迫(0.1%nACl处理)提高了小琴丝竹和刺黑竹叶片净光合速率、气孔导度和蒸腾速率,而对花叶唐竹影响不大,但随着盐胁迫浓度的增加,3种竹类植物叶片的净光合速率、气孔导度和蒸腾速率呈逐渐下降的趋势;3种竹类植物胞间二氧化碳浓度随盐胁迫浓度的提高变化规律不明显。Four important indices of photosynthesis,including net photosynthetic rate(Pn),stomatal conductance(Gs),transpiration rate(E) and intercellular CO2(Ci) of the three bamboos of Sinobambusa tootsik f.luteolo-albostriata,Bambusa multiplex ‘Alphonse-karr’ and Chimonobambusa neopurpurea were studied by LI-6400 Portable Photosynthesis System and treatments by different concentrations of NaCl(CK-0.0%,S1-0.1%,S2-0.3%,S3-0.5%,S4-0.7% and S5-1.0%) in order to discuss the effects of NaCl stress on the photosynthesis of bamboos.The results showed that: low concentrations of NaCl stress(0.1%) promoted the Pn,Gs and E of Bambusa multiplex ‘Alphonse-karr’ and Chimonobambusa neopurpurea,but little effect on Sinobambusa tootsik f.luteolo-albo-striata;from 0.3% NaCl stress to 1.0% NaCl stress,with the increasing of salinity,Pn,Gs and E of all three bamboos were decreased;Ci of all three bamboos was not in good relationship with the increasing of salinity.厦门市科学技术局科研项目(No.3502Z20102003); 厦门市市政园林局科研项目(No.YK-2000-02

羟基甲氧基苯甲醛在化妆品中起增白作用的研究

采用酶学动力学方法研究2-羟基-4-甲氧基苯甲醛(HMB)对酪氨酸酶的单酚酶和二酚酶活力的抑制效应。结果表明,HMB对酪氨酸酶单酚酶的效应只表现对稳态活力有明显的抑制作用,但对酶作用的迟滞时间没有影响;随着抑制剂浓度增大,单酚酶活力呈指数下降,导致酶活力下降50%的抑制剂浓度(IC50)为0 352mmol·L-1。HMB对二酚酶的抑制作用表现为可逆过程,IC50为0 164mmol·L-1;抑制作用机理研究表明HMB是一种混合型抑制剂,其抑制常数KI和KIS分别为0 131mmol·L-1和0 253mmol·L-1。通过对HMB抑制酪氨酸酶机理的研究,阐明HMB作为化妆品添加剂的增白作用机理

中药沐足结合护理干预治疗护理人员下肢静脉曲张的效果观察

目的探讨中药沐足结合护理干预在下肢静脉曲张护士中的应用效果。方法选取某三甲综合性医院患有下肢静脉曲张的临床护士60例为研究对象,应用随机数字表法分为两组,各30例。两组研究对象均行基础护理,对照组采用医用的循序减压弹力袜进行治疗,观察组实施中药沐足结合护理干预措施。2个月后比较两组患者疗效。结果观察组研究对象静脉曲张恢复总有效率高于对照组,观察组研究对象经过3个疗程的治疗,痊愈12例,显效l3例,有效4例;对照组分别为痊愈5例,显效8例,有效9例;观察组、对照组临床治愈率和总有效率分别为40.00%、96.67%和16.67%、73.33%。差异有统计学意义(P<0.05)。结论中药沐足结合护理干预可以改善下肢静脉曲张的临床症状。福建中医药大学2016年临床专项校管课题(XB2016085

Influence of symmetric benzene-polycarboxylate acids on the structures of silver-aminopyrimidyl derivative system

通讯作者地址: Huang, RB (通讯作者), Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] novel coordination polymers, [Ag(BTC)(1/3)(ADMP)](n) (1), [Ag(BDC)(1/2)(ADMP)](n) (2) (2-amino-4,6-dimethylpyrimidine = ADMP; H3BTC = 1,3,5-benzenetricarboxylic acid; H2BDC = 1,4-benzenedicarboxylic acid), have been synthesized under the ammoniacal conditions and structurally characterized. In complex 1, H3BTC ligand showing a new coordination mode links silver atoms to generate a two-dimensional (2-D) honeycomb-like structure, which is further linked through ADMP ligands to produce a complicated three-dimensional (3-D) framework. Complex 2 features a 2-D infinite layer framework consisting of binuclear silver clusters, which is further stacked via intermolecular C-methyl-H center dot center dot center dot pi it short contacts and Van der Waals interactions to form a 3-D supramolecular architecture. (C) 2009 Elsevier B.V. All rights reserved.National Natural Science Foundation of China 20721001 MSTC 2007CB81530

High LUMO energy level C60(OCH3)4 derivatives:Electronic acceptors for photovoltaiccellswithhigheropen-circuitvoltage

E-mail Addresses: [email protected] regioselective C-60(OCH3)(4) derivatives, C-60(OCH3)(4)-PCBM (a methanofullerene derivative of C-60(OCH3)(4), PCBM=[6,6]-phenyl-C-61-butyric acid methyl ester) and C-60(OCH3)(4)-APCBM (an aziridinofullerene derivative of C-60(OCH3)(4)) were synthesized from C60Cl6 and used as acceptor for polymer solar cells. Revealed by cyclic voltammetry, the LUMO energy levels of C-60(OCH3)4-APCBM and C-60(OCH3)(4)-PCBM are 0.2 and 0.3 eV higher than that of PCBM, respectively. For the polymer photovoltaic cells with fullerene (PCBM, C-60(OCH3)(4)-APCBM or C-60(OCH3)(4)-PCBM) acceptor in combination with poly(3-hexylthiophene) (P3HT) donor, the open-circuit voltage is increased from 0.58 V (for PCBM) to 0.63 V (for C-60(OCH3)(4)-APCBm) and 0.72 V (for C-60(OCH3)(4)-PCBM). The higher open-circuit voltages are reasonably attributed to the higher LUMO levels of the C-60(OCH3)(4) derivatives because of four electron-donating methoxy groups attached. The photovoltaic performance of C-60(OCH3)(4)-PCBMbased device is higher than that involving C-60(OCH3)(4)-APCBM, largely due to the structural changeability of C-60(OCH3)(4)-APCBM resulting from the rotatable N-C bond bridge therein. This work demonstrates that fullerene derivatives with higher LUMO level can be functionalized from multiaddition of electron-donating groups, and exemplifies that photovoltaic performances of fullerene-based solar cells are sensitive even to trivial bridge between functional group and fullerene core. (C) 2012 Elsevier B.V. All rights reserved .National Nature Science Foundation of China U1205111 21031004 21021061 J1210014 20923004 National Basic Research 973 Program of China 2011CB93590

From Graphene Sheets to Boron Nitride Nanotubes via a Carbon-Thermal Substitution Reaction

通讯作者地址: Xie,SY(通讯作者),Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, 422 Si Ming Rd, Xiamen 361005, Peoples R ChinaNSFC,21031004,21021061,973 Projects 2007CB815301 2011CB93590