植物激素吲哚乙酸的电化学行为的研究

研究了吲哚乙酸在玻碳电极上的直接电化学氧化特性，讨论了各种因素对反应的影响，研究表明，其电极反应为一扩散控制的不可逆反应，用不同的方法测定吲哚乙酸在磷在磷酸盐体系中扩散系数，计算了电荷转移系数及电极反应标准速率常数，对有关实验现象进行了合理的解释，并对电极反应机理进行了探讨。     

吲哚乙酸分子印迹电化学传感器的制备及分析应用

应用分子印迹技术,以吲哚乙酸为模板分子,吡咯为聚合单体,采用电聚合法在玻碳电极表面合成了性能稳定的吲哚乙酸分子印迹聚合物膜。利用方波伏安法分析吲哚乙酸在该印迹电极上的电化学行为,结果表明:0.55 V(vs.SCE)处的峰电流与浓度为5.0×10-6～2.4×10-4mol/L的吲哚乙酸呈线性关系,检出限(S/N=3)为2.0×10-6mol/L,响应时间为90 s;同一支印迹电极对吲哚乙酸响应值的RSD为1.7%(n=9);该印迹电极对吲哚乙酸具有较好的选择性,相对误差小于5%时,20倍的色氨酸、多巴胺和抗坏血酸以及50倍的组氨酸均对吲哚乙酸的测定不产生干扰。用该印迹电极对绿豆芽和黄豆芽进行分析,吲哚乙酸的浓度分别为5.07μmol/L和18.86μmol/L;对黄豆芽样品进行回收率测定,回收率在97%～104%之间。     

表面活性剂存在下吲哚-3-乙酸的伏安行为及其测定

采用循环伏安法、线性扫描伏安法、差分脉冲伏安法对吲哚-3-乙酸在乙炔黑电极上的伏安行为进行了研究.发现在pH7.5的磷酸盐缓冲溶液中,当有4.5×10-5mol/LCTAB存在时,于 0.60V左右产生一灵敏的氧化峰,该氧化峰的峰电流与吲哚-3-乙酸的浓度在2.0×10-7mol/L到7.0×10-6mol/L呈良好的线性关系,富集120 s后检出限为1.0×10-7mol/L.1.0×10-6mol/L吲哚-3-乙酸溶液平行测定10次的相对标准偏差(RSD)为4.2%.方法用于池塘水和土壤强化样品中吲哚-3-乙酸的测定,回收率96%~106%,相对标准偏差2.9%~4.8%.     

海带中3-吲哚乙酸对海洋微藻生长代谢的影响

利用反向高效液相色谱、UV光谱扫描和质谱方法对海带(Laminaria japonicaAresch.)提取物中的3-吲哚乙酸进行定性和定量分析,结果表明海带提取物中含有3-吲哚乙酸.在此基础上,利用反向高效液相色谱方法对3-吲哚乙酸进行制备,并研究其对小球藻(Chlorellasp.)、盐藻(Dunaliellasalina)、角毛藻(Chaetoceros muelleri)、紫球藻(Porphyridiumcruentum)和球等边金藻(Isocrydid galbana)5种海洋微藻生长代谢的影响.实验表明海带3-吲哚乙酸浓度为0~100μmol/L时,小球藻、盐藻和紫球藻细胞生长均被促进;海带3-吲哚乙酸浓度对小球藻和紫球藻胞内蛋白质含量影响显著,对小球藻叶绿素含量影响极显著.研究为海带生长素类物质活性及海洋中大型藻与微藻生长关系的研究奠定了基础.     

通过三组分串联反应构建硫醚化吲哚衍生物

为了优化硫醚化试剂与吲哚类化合物构建碳-硫键的反应,以对甲苯磺酰氯、吲哚和水合肼为底物,以碘为催化剂,采用三组分串联法合成吲哚芳基硫醚,并对反应条件进行优化.在此基础上,选用连有不同取代基团的吲哚和苯磺酰氯,在最优反应条件下进行串联反应合成硫醚化的吲哚类化合物.在最优条件下吲哚芳基硫醚的产率为68%.利用连有不同取代基团的苯磺酰氯和吲哚合成了14种硫醚化吲哚衍生物,产率为41%~86%.这些结果表明,三组分串联反应是合成硫醚化吲哚的一个简洁有效的方法.     

不同化学药剂和植物激素对日本绣线菊种子发芽的影响

用高锰酸钾、硼酸、赤霉素、奈乙酸和吲哚乙酸对日本绣线菊种子进行浸种处理表明：高锰酸钾、硼酸、奈乙酸和吲哚乙酸对日本绣线菊种子发芽有明显促进作用,它们的最适浓度分别为2．0mg／L、0．2mg／L、40mg／L和20mg／L,硼酸和吲哚乙酸的处理效果最好。不同化学药剂和植物激素的不同浸种时间对日本绣线菊种子发芽也有明显影响,高锰酸钾、硼酸、奈乙酸和吲哚乙酸的最佳浸种时间分别为18h、24h、24h和30h。     

苯酚羟化酶生物转化吲哚及甲基吲哚研究

利用苯酚羟化酶基因工程菌PH_IND对吲哚及甲基吲哚进行生物转化.结果表明,除了3-甲基吲哚外,PH_IND能将吲哚、2-甲基吲哚、4-甲基吲哚和7-甲基吲哚转化成靛蓝类色素.采用薄层色谱和液相-质谱等手段对转化产物进行鉴定,结果表明,PH_IND转化吲哚和4-甲基吲哚得到的蓝色产物分别为靛蓝和4,4′-二甲基靛蓝,并推测了PH_IND转化吲哚及4-甲基吲哚的反应途径.采用表面响应法对PH_IND转化吲哚、2-甲基吲哚及4-甲基吲哚的条件进行了优化,在最优条件下,菌株PH_IND转化吲哚合成靛蓝的最大产量为93.74mg/L,其吲哚的转化效率为52.63%,且菌株PH_IND对2-甲基吲哚和4-甲基吲哚的最大转化率分别为67.66%和95.61%.     

自由基介导C—H键环化合成吲哚酮的研究进展

吲哚酮及其衍生物广泛分布在自然界中,其合成方法研究是当前合成化学领域中的热点之一.按照偶联的方式及其相关的机理,对近几年来自由基介导C—H键环化合成吲哚酮研究进行了归纳,从催化剂、氧化剂和溶剂等反应条件对反应体系的影响出发,讨论了C—H键的切断方法.     

用"一锅法"合成取代吲哚衍生物

利用取代苯肼盐酸盐与丙酮酸、1,3-二苯基-1,3-丙二酮反应合成了3种取代吲哚衍生物.采用"一锅法"对酯化反应进行了改进,以盐酸酸化的乙醇作溶剂,苯磺酸催化,一步得到取代的吲哚酸酯.本文对吲哚环化的反应机理、合成条件进行了探讨,发现反应温度不同所得产物也不同.合成产物用IR, 1H NMR和MS进行了分析表征.     

吲唑氧衍生物对水稻幼苗生理特性的影响

报道了１０个新吲唑氧衍生物在指定浓度范围内对水稻幼苗根长，根数，茎长的影响，并与植物生长调节剂吲熟酯和吲哚乙酸进行了比较，为进一步研究了吲唑氧衍生物的生理特性提供了基础性数据。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.