钝顶螺旋藻藻蓝蛋白的提取工艺优化及其纯化研究

以钝顶螺旋藻(Spirulina platensis)藻蓝蛋白(Phycocyanin)的纯度和回收率为指标,考察溶胀法和冻融法中不同破壁影响因素及活性炭吸附法中活性炭目数、活性炭加入量和吸附时间对藻蓝蛋白粗提的影响,并结合响应面分析法优化提取工艺参数,得到最优破壁条件和活性炭吸附条件。结果表明,溶胀法最优提取条件为料液比1∶50(g/mL),溶胀时间24h,溶胀次数2次,测得藻蓝蛋白纯度为0.47,得率为2.17%;冻融法最优提取条件为料液比1∶50(g/mL),冷冻时间8h,冻融次数2次,测得藻蓝蛋白纯度为0.34,得率为2.19%。活性炭吸附法最优工艺条件为300目活性炭,活性炭加入量0.7g/20mL,吸附时间10min,藻蓝蛋白纯度为0.80,回收率为73.23%。疏水层析法纯化得到食品级藻蓝蛋白(纯度P≥0.7)和医药级藻蓝蛋白(纯度P≥3.0),总回收率为61.15%。因此,溶胀-活性炭吸附-疏水层析三步提纯藻蓝蛋白工艺合理可行,实现了医药级藻蓝蛋白的分离提纯,降低了工业生产成本,具有实用价值。     

巢湖蓝藻藻蓝蛋白稳定性的实验研究

文章以巢湖新鲜蓝藻藻泥为实验原料,冻融3次后提取获得藻蓝蛋白粗提液,经过两步盐析纯化得到藻蓝蛋白溶液。实验重点研究了温度、pH值、冻融次数及添加剂等因素对两步盐析后藻蓝蛋白溶液稳定性的影响,确定了藻蓝蛋白溶液保存的较优条件。结果表明:低温、pH值为中性条件有利于藻蓝蛋白溶液的保存;糖类、防腐剂、抗氧化剂、金属离子的添加也会影响藻蓝蛋白稳定性。     

红毛菜藻红蛋白的提取及稳定性研究

用多种提取方法提取红毛菜（Bangia fusco-purpurea）藻红蛋白并对藻红蛋白粗提液的稳定性进行了初步研究。冻融法提取藻红蛋白的得率较高；温度、pH、铜离子、铁离子及光照对藻红蛋白稳定性有很大影响，藻红蛋白较适宜的保存条件为；低温（5℃左右）、pH5.7、避光。根据实验结果，提出了藻胆蛋白光解反应的可能机理。     

不同来源钝顶螺旋藻藻蓝蛋白特性比较

 为更大程度地开发利用鄂尔多斯螺旋藻藻蓝蛋白资源,获得螺旋藻藻蓝蛋白提取及保存过程中的最佳参数,对2 藻种藻蓝蛋白硫酸铵盐析饱和度、热稳定性、酸碱稳定性进行了比较。结果显示,在硫酸铵饱和度达到40%时,2 藻种藻蓝蛋白纯度和藻蓝蛋白提取率均达到最高,且鄂尔多斯钝顶螺旋藻藻蓝蛋白纯度为引进钝顶螺旋藻的1.67 倍,两者的提取率持平。鄂尔多斯螺旋藻藻蓝蛋白对温度较引进种敏感,除25℃时相差不大外,35、45、55℃等条件下均表现出相比引进种更大的纯度降低率,多数为后者的两倍,但即使鄂尔多斯钝顶螺旋藻纯度降低率较大,降低后的纯度仍然比引进种最高纯度大,显示出鄂尔多斯钝顶螺旋藻在藻蓝蛋白上的优势。在工艺及环境条件允许的情况下,提取鄂尔多斯钝顶螺旋藻藻蓝蛋白时,尽量保持在较低温度下操作,如果兼顾提取率和纯度,宜选择55℃以内操作。2 藻种藻蓝蛋白酸碱稳定性上表现出较一致的反应,pH 值5~6 可以保持藻蓝蛋白的最大纯度。     

硒化藻蓝蛋白生物材料抗肝癌作用的研究

从富硒培养的钝顶螺旋藻中提取、纯化硒化藻蓝蛋白,采用光固定法固定硒化藻蓝蛋白到组织培养聚苯乙烯（PSt)基板上,制备生物材料,研究这种材料对体外肝癌细胞7402的抑制作用,并与藻蓝蛋白固定化材料以及亚硒酸钠作对照。     

分光光度法测定藻胆蛋白含量的研究

从多管藻和螺旋藻中提取了藻胆蛋白,利用藻胆蛋自在可见光区具有吸收的特点,建立了藻胆蛋白含量的快速测定方法．在波长565和620nm处测定藻红蛋白和藻蓝蛋白在0-1．2mg／mL内具有良好的线性关系,r藻红=0．9995,r藻蓝=0．9998,该方法测定藻红、藻蓝蛋白的回收率分别为99．07％和99．11％．与传统的Lowry法相比,该方法测定蛋向质简便快速．重现性好．     

水提分离钝顶螺旋藻藻蓝蛋白及其稳定性研究

应用水提法分离钝顶螺旋藻藻蓝蛋白后,考察了螺旋藻细胞破碎液的藻液比、盐离子浓度、pH和环境温度等对藻蓝蛋白分离的影响,并对藻蓝蛋白的耐热性能及耐酸碱性能进行了研究.结果表明：用藻液比为5 g/L及50%（NH4）2SO4进行盐析沉淀,提取藻蓝蛋白的收率可达62.4 mg/g藻粉;螺旋藻藻蓝蛋白在常温时保持稳定,在较高温度时稳定性下降;在中性溶液环境时,藻蓝蛋白的稳定性良好,偏酸或偏碱环境均改变螺旋藻藻蓝蛋白的性能.     

R-藻红蛋白的提取方法的比较研究

R-藻红蛋白的提取是其分离纯化的重要前提.因此,选择适合的提取方法是较为关键的步骤.以坛紫菜藻为材料,分别采用反复冻融法、液氮研磨法、细胞溶胀法、低浓度CaCl2提取法、SDS溶液提取法、纤维素酶提取法和超声波破碎法提取R-藻红蛋白,以期确定最佳的提取方法.研究结果表明:在反复冻融法中,以磷酸盐缓冲液为提取液,冷冻2 ...     

水花微囊藻多糖复合物的提取

研究了热水和碱提取法在不同溶剂体积、不同时间和不同温度条件下,对水花微囊藻多糖提取率的影响．结果表明：藻干重与水体积之比为 １∶１５、１００ ℃、提取６ ｈ 的条件下多糖提取率最高,为３４５．５ ｍ ｇ／ｇ 干藻,为最佳提取条件．在 ３０ ℃、６０ ℃、１００ ℃下以碱抽提,以 ４％ Ｎａ Ｏ Ｈ 浓度下多糖得率最高,分别为９９．５、２７３．２ ｍ ｇ／ｇ 干藻;热水提取效果好于碱提取．用冷水预浸泡结合等电点沉淀的方法脱蛋白对粗提取物进行纯化,结果使提取液中水溶蛋白除去率达 ６３．０％ ．用最佳提取条件获得的多糖溶液,经氯仿脱蛋白,乙醇沉淀得多糖１４．５％ ．     

不同品系地木耳藻胆蛋白含量的比较研究

对6个不同品系地木耳的藻胆蛋白含量进行测定,结果表明：不同产地的地木耳藻胆蛋白含量是存在差异的．采于内蒙古察哈尔右翼前旗的品系不论是藻蓝蛋白、别藻蓝蛋白、藻红蛋白,还是总藻胆蛋白含量在6个品系中都是最高的,而采于陕西榆林的品系则相反,各项含量均为最低．     

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.