嗜碱芽孢杆菌NTT33β-甘露聚糖酶的特性研究

本文研究了嗜碱芽孢杆菌（ Ｂａｃｉｌｌｕｓ ａｌｋａｌｏｐｈｉｌｉｃ） Ｎ Ｔ Ｔ３３β－ 甘露聚糖酶的产生条件和酶学性质．其产酶的最佳碳源为 １％ 槐豆角,最佳氮源为 １％ 蛋白胨＋ ０．２％ 酵母膏,发酵培养３６ｈ 产酶量最高（达 ６１．３ｕ／ｍ ｌ）．甘油、葡萄糖、甘露醇等对产酶有强的阻遏作用．经分离纯化后测得纯酶的分子量为３８．９ Ｋ Ｄ,等电点 ｐ Ｉ为３．０,酶反应最适 ｐ Ｈ 为 ９．０～１０．０,最适温度为８０℃,稳定 ｐ Ｈ 为６．０～９．０,稳定温度为６０℃以下,金属离子中 Ｃｕ２＋ , Ｂａ２＋ , Ｍ ｇ２＋ , Ａｌ３＋ , Ｃｏ２＋ 对该酶有一定的激活作用,而 Ａｇ＋ , Ｈｇ２＋ , Ｍｎ２＋ 对该酶有明显抑制作用     

短杆菌（Brevibacterium sp WX-10）产酶条件研究

研究了碳源、氮源、无机盐、金属离子等培养基组成和初始pH、通风量、温度等发酵条件对短杆菌(Brevibacterium sp WX-10)产酶的影响，通过正校试验优化得到的产酶培养基组成及发酵条件：蔗糖1％,NaCl2.5％，牛肉膏0．05％，NaNO3 0．05％，pH7．5，500mL三角瓶装培养基50mL，30℃于220r／min旋转式摇床上培养72h，在该培养条件下WX-10产酶量是原培养条件下的1．85倍。     

产脂肪酶假丝酵母的筛选及其研究

从武汉油污样中分离获得一株高产脂肪酶酶的假丝酵母R－2．发酵研究表明,最适培养基为蛋白胨20g/L,蔗糖10g/L,橄榄油5g/L,(NH4)2SO41g/L,MgSO4.7H2O1g/L,K2HPOR1g/L和吐温－801g/L,最适产酶条件为30℃,初始pH7．0,转速200r/min,培养32h ,最高产酶活力达到1437u/mL,酶作用最适温度40℃,最适pH7.5。     

微生物酶法生产L-半胱氨酸的产酶条件优化

以假单胞菌（Pseudomonas sp．）TS1138为供试菌株，对微生物酶法生产L-半胱氨酸的条件进行了初步研究。通过对产酶培养基中的碳氮源进行研究，得到了TS1138菌株产酶的最佳碳氮源分别为葡萄糖和尿素，DL—ATC的最适添加量为5g／L；通过对产酶培养基的产酶条件进行研究，得出了最适的种子接种量为10％，产酶培养基的最适初始pH为8．0，500mL三角瓶的最适装液量为40mL。     

枯草芽孢杆菌寡聚-1,6-葡萄糖苷酶基因在毕赤酵母中的表达研究

根据枯草芽孢杆菌（Bacillus subtilis）寡聚-1,6-葡萄糖苷酶基因序列设计引物,以pHBM003为模板,扩增得到寡聚-1,6-葡萄糖苷酶基因,克隆至毕氏酵母（Pichia pastoris）表达载体pHBM905上,获得重组毕氏酵母表达载体pHBM9053．将此质粒分别转化毕氏酵母GS115、KM71和SMD1168菌株,筛选获得重组毕赤酵母GS115（pHBM9053）、KM71（pHBM9053）和SMD1168（pHBM9053）;然后进行摇瓶诱导培养,这3株毕氏酵母分别在诱导培养60h、48h和24h后,酶活力达到最高,对应为2．233u／mL、0．34u／mL和1．235u／mL;GS115（pHBM9053）所产寡聚-1,6-葡萄糖苷酶的最适反应温度为75℃,最适反应pH值为6,在30～75℃、pH8～9范围内较稳定．     

青霉菌m8产胞外木聚糖酶的培养条件及其性质研究

适合青霉菌m8产胞外木聚糖酶的培养基含4．00％麦草粉,0．45％（NH4）2SO4,0．10％KH2PO4,0．05％MgSO4·7H2O,0．03％NaCl,0．30％Tween80,0．10％CaCO3在上述培养基中,28℃恒温振荡（120r／min）培养4～5d,木聚糖酶活力可达90u／mL左右．该酶的最适pH值为4．6,最适反应温度为55．5℃;该酶的耐热性比较强,可被K＋、Ca2＋、Mg2＋离子激活,而被Ag＋、Fe3＋、Cu2＋离子抑制;青霉菌ms的Km为5．0×10－2g／L．     

产辅酶Q10热带假丝酵母菌株C-1发酵过程优化

该文以热带假丝酵母（candida tropicalis）C-1为CoQ10的生产菌,通过发酵过程的优化,重点考察了碳源、氮源、接种量、酸碱度和装液量等对生物量和CoQ10产量的影响。发现氮源对产物合成影响最大,其次分别是酸碱度、装液量和碳源。优化后的发酵条件是：碳源,葡萄糖26g／L＋蔗糖26g／L;氮源,酵母膏7．5g／L＋蛋白胨7．5g／L;pH为6．5,装液量为40mL,发酵时间为30h,培养温度为30℃,CoQ10的得率为10．8mg／L。此外,加入适量的维生素B1、烟酸和铁离子等有利于CoQ10微生物细胞的生长和CoQ10产量的提高。     

产中性纤维素酶真菌产酶条件的优化

研究了碳源、氮源、接种量、培养时间、培养温度、培养基初始pH等条件对产中性纤维素酶真菌菌株瓶霉菌（Phialophora sp．z8）产酶的影响．结果表明：该菌株产中性纤维素酶的适宜碳源为1％稻草粉加1％可溶性淀粉,最适氮源为0．2％的（NH4）2SO4加0．1％的牛肉膏,接种量为5％,培养时间为72h,培养温度为28℃,培养基初始pH为6～7．在最适宜的条件下,培养液中内切葡聚糖酶活力可达到2．95IU／mL,而天然纤维素酶活力和滤纸酶活力却很低。     

哈茨木霉SDU3.87耐碱性纤维素酶液体发酵条件的研究

从碱性土样中分离出的1株哈茨木霉(T．harzianum)，液体发酵条件的实验表明，产酶最适的培养基初始pH为7．5，培养温度为28℃，摇床转速为160r／min；最适的单一碳源为麸皮，添加量为质量分数3．0％～5．0％；添加质量分数0．5％左右的复合氮源有利于产酶的提高；诱导物纤维素CF—11和微晶纤维素的最适添加量分别为质量分数2．0％和1．0％；添加吐温80有利于产酶的提高，添加量质量分数0．2％；用300mL三角瓶液体摇床发酵时装样量80mL左右为宜；发酵周期5～6d，获得的粗酶液的内切酶活最高为1．85U/mL，FPA为0．96U/mL．水杨素酶活为0.81U／mL。     

杏鲍菇菌丝生长条件的研究

研究了碳源、氮源、温度和酸碱度对杏鲍菇菌丝生长的影响．结果表明：玉米粉是最佳的碳源，蛋白胨是最适的氮源，菌丝对有机氮的利用明显好于无机氮，在尿素培养基上不生长．最适生长温度为25℃，最适pH值为5．5-6．5．正交试验确定了最佳组合培养基：2％玉米粉，1％蛋白胨，0．3％磷酸二氧钾，0．05％硫酸镁。     

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).     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.