鲨鱼降钙素的分离纯化及性质研究

国家自然科学基金资助项目!29677014号;; 高等学校博士点专项科研基金项

真鲷幼鱼消化酶活性的昼夜变化

福建省自然科学基金!资助项目C95009

Affecting factors of ecosystem degradation in Xiamen Bay and significance of ecological remediation

以厦门海湾生态服务功能逆向演变的历史过程为例,对该区域生态系统服务功能退化主要影响因素进行了分析。结果表明,不适当的围堤填海,过度的海洋资源开发,污染防治工程措施滞后于快速发展的区域开发,是造成海湾生态服务功能下降的重要原因。本文通过受损生态系统在长期的生态恢复过程中所付出的代价,证明生态系统资源的经济价值,进一步认识到人与环境协调发展的重要性。This paper analyzed the degradation in ecological service function of Xiamen Bay,and illustrated the key affecting factors,including unreasonable sea reclamation and sea-bank construction,unsuitable coastal resources exploitation,and lagged pollution treatment works in intensively exploited coastal area.The great expenditure and difficulty of damaged ecological service function restoration suggested the great ecological function value of undamaged ecosystem,and the great economic value of harmonious development of economy with environment protection.国家自然科学基金资助项目(20337010和20277041)

深圳海域水体和九龙江口沉积物中TCBS菌群与弧菌相关性的研究

通过传统的TCBS培养基平板计数法、16S rDNA-RFLP(16S rRNA基因的限制性酶切图谱多样性分析)及16S rDNA序列分析等方法对深圳海域水体和九龙江口沉积物中弧菌数量分布进行研究.结果表明TCBS菌群数中弧菌所占的比例因不同采样地点、不同季节而呈现较大差异.在深圳西海域及九龙江口上游盐度较低(盐度<11)的区域,TCBS菌群中弧菌所占的比例为0,TCBS菌群数与弧菌总数不相关;在河口下游盐度相对较高的区域,弧菌占TCBS菌群数的6.0%～92.0%,TCBS菌群数与弧菌总数不相关或相关性不大;高盐度的海水区域弧菌占TCBS菌群数的37.0%～100.0%,TCBS菌群数与弧菌数量显著相关(p<0.05).因此环境监测过程中利用TCBS培养基检测海洋弧菌数量时,应该通过分子鉴定或生理生化鉴定方法进行验证,以保证数据的科学性

MnO/Nitrogen-doped graphene composite cathode for high performance lithium oxygen batteries

本文采用水热法制备了MnO/氮掺杂石墨烯复合材料. 作为非水锂空气电池的正极催化剂, 该复合材料表现出了优异的电化学性能以及循环稳定性.; 在充放电电流密度为0.05 mA cm~(-2)时, 其能量效率高达84.6%, 远高于目前文献所报道的非贵金属催化剂的能量效率,; 也超过了基于贵金属的催化剂. 其氧还原反应(ORR)和氧析出反应(OER)的过电势分别仅为0.11和0.41 V.; 扫描电子显微镜(SEM)和透射电子显微镜(TEM)结果表明, 所制备的MnO纳米颗粒能够均匀地分散在氮掺杂石墨烯的表面.; 密度泛函理论(DFT)计算揭示, MnO(100)面是主要的催化活性面, 其理论ORR和OER的过电势分别仅为0.21与0.24 V,; 充放电电势差为0.45 V, 与实验结果0.52 V相当.MnO/nitrogen-doped graphene (MnO/NG) composite cathode was fabricated by; a facile one-pot method as cathode catalyst for non-aqueous lithium; oxygen batteries. It exhibited superior electrochemical performance with; higher round-trip efficiency and better cyclic stability. It showed a; high round-trip efficiency of 84.6% at the current density of 0.05 mA; cm~(-2) with the discharge and charge overpotentials of 0.11 and 0.41 V,; respectively. Through scanning electron microscopy, transmission; electron microscopy and X-ray photoelectron spectroscopy, it was; confirmed that MnO nanoparticles were homogeneously dispersed on NG; surface. The density functional theory calculations demonstrated that; the superior electrochemical performance of MnO/NG might be attribute to; the exposure of stoichiometric MnO (100) surface, with the ORR and OER; overpotential only to be 0.21 and 0.24 V, respectively. The; discharging-charging voltage gap is 0.45 V, in good agreement with the; experimental value of 0.52 V.国家重点基础研究发展计划; 国家自然科学基金; 国家基础科学人才培养基

Formation of SEI layer on LiCoO_2 electrode and the Li ion diffusion kinetics

[中文文摘]用SEM和EIS法研究了LiCoO2材料表面SEI膜的形貌特征及锂离子在其中的扩散动力学行为。SEM结果表明:化成后的LiCoO2材料表面存在SEI膜,其形貌和厚度与溶剂密切相关,在PC溶剂中形成的SEI膜要比DMC溶剂中形成的薄。EIS结果显示:锂离子在SEI膜中的扩散过渡时间比在LiCoO2材料中小1个数量级,但是扩散系数却小3~4个数量级。[英文文摘]The morphological character of the SEI layers formed on the surface of LiCoO2 and the Li ion diffusion kinetics in it were studied by the methods of SEM and EIS.The result of SEM indicated that the SEI layer was found on the surface of LiCoO2 after formation,its morphology and thickness were closely related with the solvent,the SEI layer formed in PC solvent was thinner than that formed in DMC solvent.The result of EIS showed that the Li ion diffusion transition time in SEI film was shorter for 1 order of magnitude than in LiCoO2 material , but its transfer diffusion coefficient was smaller for 3～4 orders of magnitude。973项目(2002CB211807); 福建省化学电源科技创新平台(2006H0090)

深圳海域细菌总数及可培养细菌总数的分布及其在环境评价中的应用研究

采用荧光显微镜直接计数法及2216E平板计数法对深圳海域水体细菌数量分布状况进行研究,结果发现细菌总数普遍高于可培养细菌总数1~2个数量级,可培养细菌所占的比例为0.13%~88.65%。清洁水域YMK001站位及污染严重的深圳湾GDN053站位始终是细菌总数的高值区。可培养细菌总数与细菌总数、CODMn及BOD5相关关系不显著,不能准确反应细菌总数的变化趋势及环境水体有机物的存在状态;而细菌总数与CODMn及BOD5相关关系显著且相对稳定,与环境水体有机物间呈现正相关关系。可见细菌总数相对于可培养细菌总数更适合于大范围海域的水质监测及不同海域的比较分析

Effect of Process Conditions on Electroless Ni-Co-P alloy

采用硼酸为缓冲剂 ,柠檬酸钠为络合剂化学镀Ni Co P合金。考察了镀液pH值、钴离子浓度和温度对化学镀Ni Co P沉积速度的影响 ;研究了钴离子浓度对镀层组成的影响 ,获得了化学镀Ni Co P合金的最佳工艺条件为 :镀液pH值为 7.0 ,操作温度 90℃ ,CoSO4 ·7H2 O浓度为 11g/L。此工艺下镀液稳定性好 ,镀层沉积速度快 ;所得镀层为非晶结构。The electroless Ni\|Co\|P alloys were deposited from bath using H\-3BO\-3 as buffer agent and sodium citrate as complexing agent. The effects of pH, concentration of Co\+\{2+\} and temperature on depositing rate were studied including the effect of concentration of Co\+\{2+\} on the composition of deposit. Formula of electroless Ni\|Co\|P alloys plating was optimized so as to obtain high depositing rate and good stable bath that pH was 7.0, temperature was 90 ℃ and CoSO\-4·7H\-2O content was 11 g/L. The Ni\|Co\|P plating was an amorphous structure.国家自然科学基金资助课题 (批准号 :2 0 0 730 35

ICP-MS测定肾癌患者血清微量元素水平及其临床意义分析

采用电感耦合等离子体质谱法(ICP-MS)对24例健康对照者、30例肾癌患者血清中多种微量元素的含量进行测定,探讨血清微量元素与肾肿瘤的关系。与健康对照组相比,肾癌患者血清中V、CO、nI、Mn、Cd的含量显著增高(P<0.05),而CA、zn的含量明显降低(P<0.05)。CO、nI、Cd可能是肾癌的危险因素,CA、zn可能为肾癌的保护因素。V、Mn与肾癌的相关性仍需进一步研究

Study on overcharging additives of Li-ion battery

[中文文摘]环己基苯和二甲苯作为耐过充添加剂加入锂离子电池电解液中。环己基苯和二甲苯分别在4.70 V、4.66 V(vs.Li/Li+)处发生电聚合反应。聚合物几乎全部覆盖在隔膜表面,阻断了反应,改善了电池的安全性。添加5%添加剂的电池,均可耐3C1、0 V过充电,且对电池正常充放电时的电化学性能影响很小。[英文文摘]Cyclohexyl benzene(CB) and xylene as overcharging additives were added into Liion battery electrolyte.CB and xylene could be electrochemically polymerized at 4.70 V and 4.66 V(vs.Li/Li~+),respectively.The polymer mainly deposited on the separator,restrained the reaction and improved the safety performance of the battery.The batteries with the additives could resist overcharge of 3 C,10 V when the content of additive was 5%.There was only a slight influence on the electrochemical performance of the batteries with normal charge-discharge.973项目(2002CB211800); 国家自然科学基金(20373058)；厦门市科技计划项目(3502Z20055018)