强力霉素提取废液综合利用中急性毒性试验的研究与探讨

以含有强力霉素提取废液的溶液为试验溶液,用国家急性毒性试验方法的标准观察受试动物在被灌入试验液后的反应和死亡情况,并测得强力霉素提取废液的LD50值为4.26 mL/kg,95%可信限为3.63～5.02 mL/kg.     

铁矾渣微波硫酸化焙烧水浸液的深度除铁

采用微波低温硫酸化焙烧-水浸和针铁矿除铁方法将Zn、Cu等富集到浸出液中,Pb和Ag富集到浸出渣中,使有价金属得到清洁的回收利用.研究了上述工艺中浸出液除铁的优化工艺条件,探究了反应体系的pH值、浸出液单次滴加量、浸出液的铁含量等因素对除铁效果的影响,并采用X射线衍射分析、扫描电子显微镜观察等手段对得到的沉淀渣进行了表征.研究获得的优化实验条件为：以200 mL的0.01 mol·L-1 ZnSO4溶液为底液,晶种添加量为20 g·L-1,除铁体系pH值控制在3左右,温度90℃,每隔5 min滴加3 mL水浸液(保持反应体系中铁的浓度<1 g·L-1).在此条件下,除铁后溶液残铁量仅为0.065 g·L-1,去除率可达99.3%,达到了深度除铁效果.除铁过程中,Zn的损失率仅为4.1%.     

二阶导数光谱法测定非酶褐变反应中抗坏血酸的含量

在抗坏血酸—氨基酸的体系中探讨发生非酶褐变反应后的抗坏血酸含量的测定方法.用偏磷酸溶液作为提取剂,采用二阶导数光谱法测定了非酶褐变反应中的抗坏血酸含量.测定的线性范围1.00~12.00μg/mL,回归方程:C=6 721.304A-0.058 8,线性相关系数为γ=0.999 9,加标回收率96.50%~103.75%.该方法简便,干扰小,适合发生了非酶褐变反应的体系中的抗坏血酸含量的测定.     

环己烷溶液中聚丁二烯基双锂引发剂的制备

在环己烷溶液中,由萘锂和丁二烯反应制备了聚丁二烯基双锂引发剂。利用阴离子活性聚合特点和溶度参数相近相溶原则,采取有条件分批加料的方法,解决了萘锂在环己烷溶液中不溶、引发效率低的难题。结果表明,在丁二烯的环己烷溶液由1次加入改为2次加入、溶液摩尔浓度c丁二烯≥0.75c萘锂、丁二烯聚合度达到2之前体系中环己烷溶液加入量V丁油≤1.33V萘锂的条件下,可实现聚丁二烯基双锂引发剂制备反应在均相体系中进行;引发聚合实验证明,所制备引发剂活性没有变化。     

NaBH_4水解制氢泡沫镍载钌催化剂

研究了泡沫镍载钌催化剂制备过程中,RuCl3溶液浓度、pH值和浸渍时间对催化剂性能的影响,以及反应放热与体系温度之间的关系.结果表明,当0.2 g泡沫镍在浓度为0.025 mol.L-1、pH值为5～7的RuCl3溶液中浸渍25 h后,制备出的催化剂在质量分数15%NaBH4、3%NaOH溶液中的平均制氢速率可达到600 mL.min-1.用该催化剂在20 mL NaBH4碱性溶液中使用时,水解放出的热量可使反应体系温度达到80℃.     

番红褪色法检测羟自由基清除效果研究

根据Fenton反应原理,利用番红作为显色剂检测由EDTANa2-Fe(Ⅱ)-H2O2体系产生的·OH.番红褪色光度法测定清除羟自由基的最佳反应条件为:往10 mL具塞试管中,依次加入pH7.4的磷酸缓冲液1.0mL,番红溶液(520 mg/L)0.2 mL,EDTANa2-Fe(Ⅱ)(0.003 8 mol/L)1.0 mL,不同浓度的样品溶液0.1mL,最后加入0.25%H2O20.5 mL,双蒸水稀释至刻度后于40℃保温30 min,紫外-可见分光光度法519 nm处测吸光度A.     

Pyrrosia petiolosa抗菌酯提物提取条件优化及效果

优化Pyrrosia petiolosa酯提物提取条件,初步研究其拮抗Staphylococcus aureus作用效果.采用正交试验优化提取条件,牛津杯法测定Pyrrosia petiolosa酯提物拮抗S.aureus活性;倍比稀释法测定其拮抗S.aureus的MIC和MBC值;扫描电镜观察PPEAE处理S.aureus后形态变化.正交试验结果显示:质量浓度1/20g/mL、提取温度60℃、浸提时间5d为最优提取条件,优化后酯提物抑菌效率可提高25.7%.Pyrrosia petiolosa酯提物浓缩至质量浓度分别为1和50mg/mL时,抑菌圈直径分别为8和24mm,其MIC和MBC值分别为7.8和15.6mg/mL.Pyrrosia petiolosa酯提物处理后,S.aureus表面出现部分凹陷、皱缩.正交优化可显著提高酯提物抑菌物质提取效率,Pyrrosia petiolosa酯提物具有较强的拮抗S.aureus活性.     

木瓜SOD的提取及其活性测定方法的优化

目的 建立能准确测定木瓜超氧化物岐化酶(SOD)活性的测定方法。方法 采用单因素试验分析法,通过探究邻苯三酚自氧化反应体系的最大吸收波长、测定时间段、缓冲液pH值、邻苯三酚浓度和反应温度对自氧化速率的影响,建立了测定木瓜SOD活性的邻苯三酚自氧化法最佳应用体系;通过建立的木瓜SOD活性检测方法优化木瓜SOD提取条件。结果 邻苯三酚自氧化法最佳测定条件为:检测波长319nm,测定时间范围3.5min,缓冲液pH8.20,反应温度25℃,邻苯三酚浓度4.5mmol/L。木瓜SOD最佳提取工艺为:pH6.8的磷酸盐缓冲液、超声功率600W、超声时间20min浸提木瓜SOD,丙酮分级沉淀法纯化木瓜中的SOD,最终所得SOD用邻苯三酚自氧化法测定活性为529.72U/mg。结论 建立了能准确测定木瓜SOD活性的检测方法,并筛选得到木瓜最佳SOD提取条件。     

羟胺-乙二胺-钴(Ⅱ)显色体系与甲醛质量浓度测定的研究

采用正交试验法研究了羟胺-乙二胺-钴(Ⅱ)的显色体系与甲醛反应的最佳条件．最 佳条件为5．00×10-2 mol／L羟胺溶液2．00 mL,1．00×10-1 mol／L乙二胺溶液3．0 mL,2．00×10-1 moL／L钴(Ⅱ)溶液5．00 mL,0．200 mol／L硫酸溶液0．80 mL,加热温度为55℃,加热时间为6 min．甲 醛质量浓度在0．080-3．200μg／mL范围内线性关系良好,检测下限为0．061 0 μg／mL,线性相关系数 为0．998 7．该法可用于饮用水加标回收率实验及脲醛树脂中的游离甲醛质量浓度检测．     

三明产小辣椒总碱的微波辅助法提取研究

目的研究利用微波辅助方法,从三明建宁产小辣椒中提取辣椒总碱的最佳工艺条件。方法通过单因素试验考察溶剂、微波功率、时间、料液比对辣椒总碱提取率的影响,利用正交试验确定最佳提取工艺条件。结果与结论实验结果表明,辣椒总碱的最佳工艺条件为:VCH3CH2OH∶VCH3COCH3=1∶1,微波处理时间为3 min,微波功率为采用低火档,液料比为1∶15(g∶mL),浸泡时间为2 h,提取2次,辣椒总碱提取率为52.5%。选用质量浓度15%NaOH溶液,所得辣椒总碱质量(g)和15%NaOH溶液体积(mL)的配比为1∶5,在50℃浸泡2.0 h,此条件下辣味去除比较明显,辣椒总碱提取率最佳。     

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.