海洋鱼类和青蟹抗菌肽hepcidin和scygonadin的研究

抗菌肽或抗微生物肽因具有杀死或抑制微生物的共同特性,近年来科学家又将这些肽类称为"天然抗生素",有望在将来作为一种新型的生物药物替代现有的化学类抗生素.海洋动物中蕴藏着世界上丰富的抗菌活性物质,研究与开发应用海洋动物抗菌肽成为近年来的研究热点.结合国内外的相关研究进展,简要总结了课题组近年来在我国海水养殖鱼类抗菌肽hepcidin和青蟹抗菌肽scygonadin的研究进展,从抗菌肽的蛋白分离、纯化、基因克隆、基因表达模式、基因工程表达以及抗菌肽合成与表达产品的抗菌活性等进行了简要细致的叙述,对深入探索海洋动物抗菌肽在我国水产养殖业的开发应用具有重要的参考价值.     

免疫相关基因在健康革胡子鲶不同组织的表达分析

应用荧光定量PCR法分析抗菌肽hepcidin、c型溶菌酶和MHCⅠ基因在健康革胡子鲶肝胰脏、脾脏、胃、肠道、肾脏、头肾、心脏、脑、鳃、鳃上器官、背部皮肤、背部肌肉和尾鳍13种组织中的表达.结果显示:3种基因在以上组织中均有表达,Hepcidin基因在脾脏中表达最高,显著高于除肾脏以外的其它组织(P0.05);c型溶菌酶基因在胃中表达量最高,与其余组织的表达差异显著(P0.05);而MHCⅠ基因在脾脏和鳃中表达量相对较高,但13种组织间的表达差异不显著(P0.05).     

黑鲷抗菌肽hepcidin在毕赤酵母中的表达及其抗菌活性

鱼类抗菌肽hepcidin具有广谱抗菌活性.利用PCR技术扩增获得了黑鲷抗菌肽hepcidin (AS-hepc2)的前体肽和成熟肽 cDNA 序列,片段大小约250 bp.将其与毕赤酵母(Pichia pastoris) pPIC9K 质粒连接,构建了分泌表达载体pPIC9K/AS-hepc2 .电击法转化重组表达载体,经过G418筛选和选择性培养基以及PCR鉴定,得到的克隆子都为Mut+.以甲醇诱导pPIC9K/AS-hepc2,分泌表达上清中获得10 ku左右的表达产物,与预期的目的蛋白黑鲷hepcidin的前体肽和成熟肽的大小相符.表达试验证明,随时间的延长,表达产物量增多,至120 h 达到高峰.表达产物具有很强的热稳定性.用抑菌圈法测定重组蛋白Pro-AS-hepc2 的抗菌活性,发现能抑制革兰氏阳性菌和革兰氏阴性菌的生长.     

抗菌肽的研究及其在植物基因工程中的应用

抗菌肽是一类新型的抗菌物质,在低等生物到高等动植物有广泛分布．抗菌肽及人工合成的抗菌肽基因在植物体中可以被表达并具有杀菌活性,能够应用于植物抗病工程方面,从而提高植物的抗病性．本文简要介绍了抗菌肽的发现、分类、结构、作用机理、基因结构和基因改造,以及抗菌肽在植物基因工程中的应用．     

土大黄苷、胡黄连苷Ⅱ对肝癌细胞Hepcidin表达的影响

β-地中海贫血是在我国南方各省高发,并显现出低hepcidin水平和铁负荷现象的一类基因缺陷型疾病。以hepcidin为研究靶点,传统的中药单体提取化合物土大黄苷和胡黄连苷Ⅱ为研究对象,研究其对hepcidin表达的调节效应。通过外源性Hamp双荧光素酶报告基因及内源性mRNA的双重验证,土大黄苷、胡黄连苷Ⅱ均表现出对hepcidin表达的刺激效应。土大黄苷和胡黄连苷Ⅱ有望成为有效缓解β-地中海贫血的潜在药物。     

新型抗菌肽基因设计、合成及在酵母中的表达(Ⅱ)——抗菌肽 AD 基因在酵母中的表达

将抗菌肽ＡＤ基因定向克隆到大肠杆菌－酵母穿梭质粒ｐＣＬＷＡ２的ＢａｍＨＩ和ＳａｌＩ位点上,构建成含抗菌肽ＡＤ基因的重组质粒ｐＣＡＤ,转化酵母宿主菌ＡＢ１０３,转化子在缺乏亮氨酸的ＳＤ选择培养中３０℃培养４８ｈ,培养液经简单纯化后,活性蛋白ＰＡＧＥ和琼脂孔穴扩散法测定抑菌活性表明,抗菌肽ＡＤ基因在酵母中获得表达．     

新型抗菌肽基因设计,合成及在酵母中的表达（Ⅱ）：抗菌肽AD基因在 …

将抗菌肽ＡＤ基因定向克隆到大杆菌－酵母穿质粒ｐＣＬＷＡ２的ＢａｍＨＩ和ＳａｌＩ位点上。构建成含抗菌肽ＡＤ基因的重组质粒ｐＣＡＤ,转化酵母宿主菌ＡＢ１０３。     

ApiIa抗菌肽基因的化学合成,克隆及其在酵母中的表达

用固相亚磷酰胺法合成了ＡｐｉＩａ抗菌肽基因,全长为８０个核苷酸。它被分成４个寡核苷酸片段,分别在ＤＮＡ合成仪上的合成经分离纯化后的寡核苷酸片段经酶促连接,然后被克隆到分泌型载体质粒ｐＡＦＤ１０１上,经限制酶酶切,ＰＣＲ模板检测以及双链ＤＮＡ序列分析检测,证明合成的ａｐｉＩａ基因和设计的完全一致。     

鲈鱼苗烂鳃,烂尾病病原菌的研究

１９９７年４￣５月,对花鲈鱼苗期细菌性烂鳃和烂尾病的病原菌进行了研究。从具有明显症状的病鱼的病灶组织分离到２株致病菌Ｃ－１和Ｗ－１,经人工感染及从人工感染发病鱼体再分离的Ｗ－４和Ｗ－５菌株的再感染试验结果表明,所分离的细菌为鲈鱼苗烂尾,烂鳃病的致病菌。     

从吉林林蛙干皮中提取抗菌肽

从吉林林蛙干皮中分离提取了具有广谱抗菌作用的多肽 ,制备得到抗菌肽样品。在实验中摸索出提取抗菌肽的最佳工艺路线 ,建立了抗菌肽的纯化方法 ,并对所得到的抗菌肽的氨基酸进行组成分析     

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.