分离谷氨酸菌体蛋白工艺的研究

发酵法生产味精工艺中 ,提取味精后的废液内含有大量的谷氨酸菌体蛋白 ,对其絮凝过滤机理进行了研究 ,采用高分子化合物作为絮凝剂 ,用絮凝过滤方法分离提取谷氨酸菌体蛋白 .该方法操作简单、菌体得率高     

葎草叶蛋白提取工艺的优化

对配合使用酸法、碱法以及加热法提取葎草叶蛋白的工艺及工艺条件进行了初步的研究，以提高其蛋白质含量。分别进行了浸提剂pH值、料液比、打浆时间、浸提时间、汁液pH值和絮凝温度对蛋白质影响的单因素实验研究，结果表明，葎草叶蛋白的最佳提取工艺条件：常温下料液比1：5，打浆时间3min，浸提时间3min，浸提剂的pH值为6～8；葎草叶蛋白的分离条件为70℃时，沉淀分离得到叶绿体叶蛋白，调pH值为10时分离出细胞质叶蛋白Ⅰ，调pH值为2时分离出细胞质叶蛋白Ⅱ；葎草叶蛋白产品在60—80℃条件下干燥。采用此工艺提取葎草叶蛋白的得率为4．62％。     

蛋糕粉中无铝复合膨松剂的优化配方

研究蛋糕粉中添加的无铝复合膨松剂,首先通过单因素实验确定了碳酸氢钠、柠檬酸、酒石酸氢钾、葡萄糖酸内酯的添加范围分别为26%～28%、5%～10%、18%～23%、12%～17%,再通过正交实验对配方进行优化,最终确定蛋糕粉中无铝复合膨松剂各组分的最佳添加量为碳酸氢钠28%、葡萄糖酸内酯15%、酒石酸氢钾23%、柠檬酸10%、食盐15%、淀粉9%.在最佳配方下进行验证实验,蛋糕品质感官评分为92.5.     

谷氨酰胺转氨酶对豆浆凝固性能影响

运用正交旋转组合设计的方法研究了谷氨酰胺转氨酶活性、反应温度和反应时间对豆浆凝固的影响,并利用得到的最佳组合与葡萄糖酸-γ-内酯分别对豆浆进行凝固实验,比较两者的凝胶性和抗压能力.结果表明:MTG酶活性、反应时间和反应温度对豆浆凝固影响较大,当酶活力为0.04～O.64 u/mL,35 ～50℃作用170～310min均可使豆浆凝固,其中又以酶活0.32 u/mL、45℃作用300 min效果为最佳,此时豆腐凝固体积比为76.92%,高度比为73.98%,分别比葡萄糖酸-γ-内酯豆腐高10.25%和4.82%.     

苜蓿叶蛋白提取工艺的优化研究

本文应用直接加热法、酸碱化加热法和酸碱法对苜蓿叶蛋白的提取方法进行了比较研究，同时对叶蛋白提取的工艺参数进行了优化试验。结果表明在苜蓿叶蛋白最佳的提取方法为直接加热法，最佳工艺参数为料水比1：3，滤布层数为2层，过滤后于85℃水浴中，恒温7min。在最佳工艺条件下，苜蓿叶蛋白得率可达4．70％。     

固体酸催化15-羟基十五烷酸酯合成环十五内酯

为探讨合成环十五内酯的新工艺,以蒜头果油为原料制备15-羟基十五烷酸酯,在强酸性阳离子交换树脂催化下合成环十五内酯.比较了两条合成路线:蒜头果油经提取得到二十四碳-15-烯酸,经臭氧化、还原、甲酯化反应得到15-羟基十五烷酸甲酯,在强酸性阳离子交换树脂催化下发生内酯化反应生成环十五内酯,收率为14.4%;蒜头果油直接经臭氧化、还原、甲酯化反应后,在强酸性阳离子交换树脂催化下发生内酯化反应生成环十五内酯,收率为10.4%.考察了树脂类型以及不同酯基的15-羟基十五烷酸酯对内酯化反应的影响,结果表明LS-50树脂的催化效果最佳,15-羟基十五烷酸乙酯合成环十五内酯的收率达到19.5%.     

不同培养条件下混合菌系对Cr3+的絮凝

从土壤和污泥中筛选出的混合菌群,在葡萄糖肉汤培养基和硅酸盐细菌培养基中培养,并用分光光度法测定混合菌群对Cr3 的絮凝效果.实验结果表明:2种培养基中混合菌群的代谢物对废液中的Cr3 均有絮凝作用;葡萄糖肉汤培养基培养的混合菌群在16h内达到生长峰值,pH4.0,对Cr3 的絮凝率达71.42%;硅酸盐细菌培养基培养的混合菌群到达生长峰值所需时间为30h,pH5.23,对Cr3 的絮凝率达93.51%;最适絮凝温度为30℃.     

高效微生物絮凝剂产生菌BJ-I的筛选鉴定及絮凝特性研究

从活性污泥中筛选出1株高效微生物絮凝剂产生菌BJ-I,其絮凝率达87.6%.通过生理生化分析及16S rDNA序列鉴定该菌株为短芽孢杆菌(Bacillus brevis).该菌产絮凝剂的最适碳源和氮源分别为20 g/L的葡萄糖和2.0 g/L的蛋白胨;适宜的初始pH和培养温度分别为7.0和30℃;在培养基中添加0.5 g/L的Mg2+有利于菌体生长,但对絮凝荆合成无影响.对该絮凝剂的特性研究结果表明:菌液投放量3%、pH值在5～9、温度为60 ℃条件下絮凝效果最好,加入浓度为8%的Ca2+可显著提高其絮凝活性.实验证明,该菌起絮凝作用的物质存在于发酵液中,主要成分为杂多糖.     

水葫芦提取植物蛋白废液培养小球藻初步研究

为提高小球藻培养的经济效益和高效资源化综合利用水葫芦,初步研究了水葫芦提取植物蛋白废液对小球藻生长、叶绿素和蛋白质含量的影响。研究结果表明,光照条件下,培养藻液中添加不超过6%体积的水葫芦废液,小球藻的生长速度及藻体叶绿素和蛋白质含量均随废液添加量的增加而提高,即使培养藻液中不添加任何营养元素而只添加1%～6%体积的废液,小球藻的生长速度及藻体叶绿素和蛋白质含量即可达到和超过基础营养液培养组的小球藻,说明水葫芦提取植物蛋白的废液可极大地提高小球藻培养的经济效益,甚至可完全替代营养盐的添加;但在无光条件下,添加废液对小球藻生长无效,说明未经处理的水葫芦废液尚不能作为小球藻异养培养的营养源。     

稀盐酸预处理沼气发酵原料水葫芦的优化条件研究

以采自昆明滇池的新鲜水葫芦为材料,以酸降解液中所含还原糖和挥发性脂肪酸的含量为指标,研究温度、酸质量分数、固液比和处理时间对稀盐酸降解新鲜水葫芦有机质的影响.结果表明,各因素对还原糖含量的影响顺序为:温度酸质量分数固液比处理时间;对挥发性脂肪酸含量的影响顺序为:酸质量分数固液比处理时间温度.同时确定了稀盐酸预处理水葫芦的最佳条件为:酸质量分数7%,处理温度60 ℃,固液比1 g:3 mL,处理时间1.5 h,在此条件下还原糖和挥发性脂肪酸转化率达到4.4%和29.0%,与未处理样相比分别提高了628%和491%.可见,以此方式可提高水葫芦的生物利用率.     

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.     

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…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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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。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

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