雨生红球藻的培养及虾青素累积条件的探讨

探讨了雨生红球藻(Haematoccuspluvialis) 712株的适宜培养条件及藻体诱导累积虾青素的培养基条件.重点研究了温度、pH和光照条件对雨生红球藻营养生长的影响,以及NaNO3 、Fe2 + 盐和乙酸钠浓度对雨生红球藻诱导累积虾青素含量的影响.结果表明,2 4℃、10 0 0～15 0 0lx连续光照,pH8.0左右的生长条件适合雨生红球藻游动细胞增殖,使平均生长速率达到0 .2 5 2d-1.通过正交试验表明缺氮培养基对于雨生红球藻细胞累积虾青素最为有利,虾青素含量达到6 .72 μg·mL-1,而FeSO4和乙酸钠浓度对虾青素的累积无显著性的影响     

维生素B1、B12在雨生红球藻不同培养阶段的作用研究

研究了维生素B1、B12对雨生红球藻营养生长及胁迫阶段各生长指标的影响.研究结果表明适量维生素的加入具有促进雨生红球藻生长、提高胁迫条件下的微藻存活率、以及促进虾青素积累等作用.其中,在培养基中添加w(B12)=5×10-8维生素B12,可以使雨生红球藻的生长率、存活率和虾青素产量分别较空白组提高21%、264%和43%以上.此外,研究还发现在单独加入维生素B1和B12的培养组中,大部分培养组的孢子比率均明显下降,这为降低虾青素的提取难度和提高虾青素的利用率提供了新的思路.     

雨生红球藻无菌化处理及其对生长和生理的影响

实验研究了雨生红球藻FACHB-712藻株对氨苄青霉素、卡那霉素、链霉素、庆大霉素4种抗生素的敏感性以及这4种抗生素对FACHB-712藻株生长的影响,结果表明:低质量浓度的链霉素、卡那霉素、庆大霉素对FACHB-712藻液中的细菌具有明显的抑制作用.但链霉素和卡那霉素的质量浓度为10μg·m L~(-1)时,雨生红球藻FACHB-712藻株的生长受到明显抑制,庆大霉素的质量浓度低于10μg·m L~(-1)时,对FACHB-712藻株的生长无明显影响.氨苄青霉素质量浓度为10~200μg·m L~(-1)时,对FACHB-712藻株生长具有促进作用,质量浓度为500μg·m L~(-1)时,则对FACHB-712藻株生长有一定的抑制作用.在此基础上,采用6种方法添加抗生素,除了A(300μg·m L~(-1)的氨苄青霉素和5μg·m L~(-1)庆大霉素连续处理6 d)和B(300μg·m L~(-1)的氨苄青霉素和5μg·m L~(-1)卡那霉素连续处理6 d)两种处理方法外,其他处理方法均能获得无菌藻株.无菌藻株与有菌藻株相比较,无菌藻株不易老化,游动营养细胞较多,厚壁孢子数量较少,但无菌藻株与有菌藻株在潜在最大光合效率、潜在最大光合速率、耐受强光的能力以及对光强的利用能力等光合能力方面无统计学上差异(P0.05).     

酿酒酵母与雨生红球藻的细胞融合子的RAPD鉴定

用7条随机引物对雨生红球藻(Haemotococcumpluvies)、酿酒酵母(Saccaromycescerevisiae)及其融合酵母变株进行RAPD分析.在融合子的54条谱带中,有7条为双亲共有,占12.96%,与酿酒酵母相同的18条(33%),与雨生红球藻相同的17条(30.9%),其余12条(23.54%)为融合子的新谱带,结果表明该融合子很可能是雨生红球藻、酿酒酵母细胞杂种.     

雨生红球藻的培养及虾青素的提取与检测

以雨生红球藻为原材料,通过对光照条件、培养液pH和温度等条件的优化确定雨生红球藻在改良后的BBM培养基中的适宜生长条件;采用研磨结合超声波破碎的方法对雨生红球藻进行破壁,利用乙酸乙酯、丙酮和70%乙醇分别提取雨生红球藻中的虾青素,并通过紫外吸收光谱、红外吸收光谱以及高效液相色谱对虾青素的含量进行检测分析,确定虾青素的最佳提取方法。结果表明:在pH=8.0的改良BBM培养基中,光照度为2 000~2 500 lx时连续24 h光照条件下雨生红球藻能够快速生长和繁殖,采用研磨法破壁后利用乙酸乙酯提取虾青素的提取率可达91.41%。本实验优化了雨生红球藻的培养条件,确定了虾青素提取的有效方法,为雨生红球藻的扩大生产及深入研究奠定了基础。     

雨生红球藻农杆菌转化体系的建立

文章以植物表达载体pBI121、农杆菌EHA105为体系,建立了农杆菌介导的雨生红球藻转化方法,通过筛选羧苄青霉素、G418等抗生素对雨生红球藻生长的影响,确定了以200μg/L G418和500mg/L羧苄青霉素为筛选体系。转化的雨生红球藻以CaMV 35S和来源于番茄的八氢番茄红素脱氢酶基因的启动子(PDS启动子)成功表达了报告基因GFP和YFP,拓宽了pBI121载体的应用范围,为雨生红球藻的转化提供了一个新的遗传转化途径。番茄来源的PDS启动子能够启动报告基因的表达,表明植物源的启动子能够在雨生红球藻中表达,为植物源的启动子验证及基因瞬时表达提供了一个新的方法。     

复合维生素对雨生血球藻生长及虾青素积累的影响

采用淡水经济微藻雨生血球藻(Haematococcus pluvialis CH-1)为实验藻种, 研究了复合添加维生素B1(VB1)、B12 (VB12)和维生素H(VH)对雨生血球藻生长及虾青素质量浓度的影响.实验分别复合添加VB1/VB12、VB1/VH、VB12/VH和VB1/VB12/VH,每组各分6个浓度梯度.在4组复合添加实验中,VB1/VB12、VB1/VH、VB12/VH、VB1/VB12/VH的最佳添加质量浓度分别为100/0.5、100/5、0.5/5和1 000/5/50 μg/L.4组处理的细胞密度分别比空白提高了22.3%、21.5%、24.3%和20.9%,虾青素质量浓度分别比空白提高了24.1%、24.0%、26.5%和23.8%.此外,在该实验设定的添加浓度范围内,维生素的添加量为各组的最高浓度时,雨生血球藻的细胞密度和虾青素质量浓度均显著低于空白.结果表明,适量复合添加三种维生素中的两种或三种均具有促进雨生血球藻生长及虾青素积累的作用.     

光强对雨生红球藻生长的影响

采用BG11培养基,设置日光、500、1 000、2 000、2 500、3 000、4 000 lx的光照强度梯度,用分光光度法测定各组培养液叶绿素a的含量,研究光照强度对雨生红球藻生长速率的影响.结果表明,2 500 lx为雨生红球藻株的最适光照强度,其叶绿素含量随培养时间延长而增长,第8 d其叶绿素a含量达到最大值,之后呈现下降趋势.     

雨生红球藻室外大体积培养与虾青素积累初步研究

针对雨生红球藻(Haematococcus pluvialis)大体积室外培养开展实验,对不同品系藻株、不同营养方式、胁迫条件等对雨生红球藻生长及虾青素积累的进行了初步研究.结果表明, HPM品系在室外培养过程中指数生长率为0.22,胁迫后虾青素产率为1.35 mg/L,均优于其他两个品系.室外培养中加入醋酸钠的混合培养基可以缩短胁迫时间,并且其虾青素的积累量比光合自养培养下提高了126.3%.盐胁迫比高光胁迫更能有效地积累虾青素,虾青素产率从0.76 mg/L提高到了1.33 mg/L.     

雨生红球藻室外大体积培养与虾青素积累初步研究

针对雨生红球藻（Haematococcus pluvialis）大体积室外培养开展实验，对不同品系藻株、不同营养方式、胁迫条件等对雨生红球藻生长及虾青素积累的进行了初步研究．结果表明，HPM品系在室外培养过程中指数生长率为0．22，胁迫后虾青素产率为1．35mg／L，均优于其他两个品系．室外培养中加入醋酸钠的混合培养基可以缩短胁迫时间，并且其虾青素的积累量比光合自养培养下提高了126．3％．盐胁迫比高光胁迫更能有效地积累虾青素，虾青素产率从0．76mg／L提高到了1．33mg／L．     

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.