Distribution of Bacteria Injected in Body of Giant Black Shrimp,Penaeus Monodon

Distribution of injected Vibrio anguillarum in body of P,,naeus monodon was studied with immunohistochemical method. Bacteria could be detected throughout the experiment in some individuals; however in lymphoid tissue, gill, heart and haemolymph of all vibrio injected shrimp, the bacteria could be observed only 5 min after injection. The bacteria density in haemolymph, haemolymph of the hepatopancreas and gills decreased with time. In the lymphoid organ and heart, the bacteria density was the highest 48 h after injection, then decreased. Nodules could be formed in the heart, lymphoid organ and injection site.     

A Study on the Meat and Bone Meal and Poultry By-product Meal as Protein Substitutes of Fish Meal in Practical Diets for Litopenaeus vannamei Juveniles

1　Introduction　Proteinisanimportantnutritionalingredientofaquaticfeed .Thehighproteinneedsoffish ,shrimpandmostotheraquaticanimalsissuppliedmainlybyfishmeal (WilliamsandBarlow ,1996 ) .Recently ,thefishmeal,asamainproteinsourceofaquaticfeedisshort suppliedintheinternationalmarketanditspriceisbecominghigherandhigher .Therefore ,itisnecessarytofindsubstitutesoffishmealasaproteinsourceofaquaticfeed .　Someotheranimalby productmealssuchasmeatandbonemeal (MBM )andpoultryby productmeal(PBM )ha…     

论激光荧光法测定水系沉积物中的痕量铀

试样经盐酸、硝酸、氢氟酸、高氯酸分解蒸干后,用50g/LNa2CO3溶液浸取分离,用MUB型激光铀分析仪测定上清液的铀的含量。该方法参加了地球化学考核样品的测试,合格率95%以上。适用于大批量的地质样品中痕量铀的测定。     

土壤有效硫批量检测方法改进

土壤有效硫检测的常规方法是利用硫酸钡比浊法,鉴于规范推荐的测试步骤在批量土壤样品测试时效率较低,因此对常规方法进行了改进。加入2.0g氯化钡晶粒改为加入浓度为200g/L氯化钡溶液10mL;加稳固剂阿拉伯胶水溶液4mL改为加入浓度为6%甘油-乙醇(1+2)溶液5mL。通过对比实验,改进后检测方法比常规方法操作简便快捷,省时、省力、数据准确可靠,标准曲线线性相关系数达到0.9982。对土壤有效态成分分析标准物质土样GBW07459(ASA-8)、GBW07460(ASA-9) GBW07461(ASA-10)进行多次平行测试,测试结果全部在标准值范围内,且平行相对相差≤10%,证明改进后的检测方法可用于土壤有效硫的检测。     

八家子银-多金属矿田铁锰矿物组合对银富集的潜在意义

八家子银－多金属矿床是燕山期形成的热液充填交代脉状矿床。矿床的铁锰矿物组合大致分两期：一期为石英－锰橄榄石－方解石－黄铁矿组合；二期为石英－蔷薇辉石－铁锰碳酸盐矿物及银多金属硫化物组合。成矿溶液中Ｍｎ￣（２＋），Ｍｇ￣（２＋），Ｃａ￣（２＋），Ｆｅ￣（２＋）离子对银的沉淀富集作用十分显著，尤其是Ｍｎ￣（２＋），Ｆｅ￣（２＋）可使Ａｇ￣＋还原到自然状态。银矿物主要以细粒、微粒、浑圆粒状、乳滴状包裹体的形式赋存在黄铁矿等硫化物中：或以类质同像及杂质的形式与铁、钙矿物形成银－铁、银－锰的共生体。铁锰矿物多形成于中低温热液阶段，因该阶段Ｓ￣（２－）含量较高，故极有利于银－多金属硫化物的形成。     

碳酸钠、硫酸锌混合溶液在铅锌分离浮选中的研究与应用

在回收广西某地铅锌矿尾矿的铅锌中,针对铅锌品位及含泥量变化大、原工艺流程中铅锌分离效果的差状况,对锌抑制剂进行了研究,研究表明,采取碳酸钠 硫酸锌混合溶液给药方式,铅锌分离效果最佳。经多年生产实践,新工艺在提高生产技术指标同时,也取得了明显的经济效益。     

某些地下热水矿床的矿物包裹体溶液与地下水性质的初步研究

通过对与海水、卤水、岩溶水和膏盐层地下水有成因联系的几个典型矿床的矿物包裹体溶液和地下水的水化学性质的研究表明,二者在离子成分、浓度和矿化度等方面都保持着明显的一致性。这种一致性是这些矿床的成矿溶液地下水起源的更为直接的证据。     

Gold and tin of fluid-magmatic systems： causes of combination-separation of concentration elements

The aim of the investigation is to reveal possible causes of isolation and co-occurrence of the economically significant concentrations of gold and tin. Comparative analysis of the different-rank factors that influenced migration and concentration of these elements show that different geochemical properties of Au and Sn are responsible for isolation of their big concentrations giving rise to independent metallogenic provinces, zones, and ore nodes. These differences resulted in individualization of the element migration ways to the level of ore concentration within the fluid-magmatic columns. Three main factors influenced the Au and Sn migration activity: different patterns of metal connection with the melt structure, different relation with oxygen, and different relation with other strong oxidizers. By the moment when ore-bearing fluid became isolated from magmas, the metallogenic signature of the melts, contrasting in redox-potential, had already been defined that was confirmed by the fact that tin ores associate predominantly with the granitoids of ilmenite series and gold ores with those of magnetite series. The fluid-magmatic systemswith an intermediate degree of the melt reduction-oxidation may be considered the potential producers of the combined metal concentrations. In these cases, the combined concentrating of tin and gold is plagued by an opposite direction of the oxidation-reduction reactions when their most common minerals are formed: the main migration form of Sn+2 must be oxidized (with cassiterite portioning) , and the forms of Au+ or Au+3 must be reduced (with native gold portioning) . Probably, because of this the combined tin and gold concentrations are dominated by one of the metals with a tendency of accumulation in different-stage mineral complexes.     

驱油用聚合物溶液的拉伸流变性能

测试不同类型聚合物在不同质量浓度、不同盐度条件下拉伸流变性能.结果表明:随着聚合物溶液质量浓度的增大其拉伸黏度也增大,随着溶液中NaCl盐度增加而拉伸黏度减小,但不同类型聚合物拉伸黏度受质量浓度和盐度影响的强弱不同.通过对聚合物拉伸流变性能的测试,可以分析溶液中聚合物分子的存在状态及作用机理,进而指导油田用聚合物的筛选...     

方解石与柠檬酸/酒石酸模拟实验中的反应规律

柠檬酸/酒石酸可使方解石产生矿物溶蚀及生物矿化等现象,研究它们之间的反应规律对富含有机酸环境中方解石矿物的稳定性评估及相应的地球化学效应研究具有重要意义。通过批量平衡法,研究开放系统条件下方解石与柠檬酸/酒石酸之间的反应规律及对应的溶液化学变化。结果表明：(1)初始浓度为20 mg·L^-1条件下,初始pH值由7.7升至9.7,柠檬酸与酒石酸的反应去除量均显著下降,这是由于方解石表面的静电效应及溶液中HCO^-₃与CO■的竞争效应不断增强,对两种酸的表面吸附反应起抑制作用。(2)初始pH值为7.7及8.3条件下,初始浓度为20 mg·L^-1的两种酸与方解石反应7 h后便达到平衡,pH值和Ca浓度较空白值变化不大,辅证了反应的主导机制为表面吸附。(3)在0～900 mg·L^-1浓度范围内,柠檬酸和酒石酸在初始pH值为8.3条件下,其反应去除量均能用Langmuir吸附模型很好地拟合,辅证了以上的反应去除机制均为表面吸附;初始pH值为7.7条件下,柠檬酸的反应去除量可用Langmuir...     

Reconstruction of protoliths of metamorphic rocks and tectonic setting of Wolegen Group

Parametamorphic rocks from Arong County in southeastern Inner Mongolia- Daxinganling district are regarded as Proterozoic in age, belonging to the Wolegen Group and composed of volcanoclastic and sand- stone in origin, and have been disputed in tectonic setting. Because of the stability in metamorphism, the rare earth elements indicate the features of their protoliths. The authors integrated the petrologic methods with the geochemical parameters which include ЕREE, ЕLREE/NHREE, δCe, δEu, La/Yb, Sm/Nd, Th/Sc and the standard values of chondrite. The results show that the protoliths of Wolengen Group may be a group of volcanoclastic and continental margin clastic rocks, and their tectonic setting is the continent island arc.     

桂东金矿氢、氧、碳同位素组成特征及矿床成因探讨

本文通过对桂东地区主要金矿的氢、氧、碳同位素组成特征研究所取得的成矿信息,探讨了金矿成矿溶液性质、来源及演化过程,指出产于不同地质体内的金矿,其成矿溶液性质、来源不完全一致。但总的特征是以岩浆水为主,混有少量变质水和大气降水的混合溶液,矿床成因应属多种热液复合叠加型的复成因类型金矿,并探讨了氢氧同位素在找矿上的应用。     

Analysis of Social Integration Models of Tourism Labor Migrants——A Case Study of Jiuhua Mountain of Anhui Province,China

The grounded theory of qualitative methods was applied to researching the social integration of tourism labor migrants in the Jiuhua Mountain of Anhui Province, China. The research was conducted based on the in-depth interviewing of 15 samples, open-consultation and the analysis of secondhand data. The integration models of tourism labor migrants in the Jiuhua Mountain were formed through four processes including theoretic sampling, coding-analysis, cross-tabulation and contextualization. The result shows that modes of production and life styles decide self-integration orientation of tourism labor migrants in the Jiuhua Mountain. Cultural differences are fundamental dissimilarity between tourism labor migrants and natives. There are three kinds of integration models including rapid, free and gradually advancing integration. The differences among different types of migrants＇ integration models are remarkable. Taking the working integration as the abscissa and taking the life integration as the coordinate, an ＂S＂ model of integration matrix appears in the gradually advancing integration of intermediate and high administers from the working to the life which should be paid special attention to.     

Construction of a Metagenomic DNA Library of Sponge Symbionts and Screening of Antibacterial Metabolites

To study the bioactive metabolites produced by sponge-derived uncultured symbionts, a metagenomic DNA library of the symbionts of sponge Gelliodes gracilis was constructed. The average size of DNA inserts in the library was 20 kb. This library was screened for antibiotic activity using paper disc assaying. Two clones displayed the antibacterial activity against Micrococcus tetragenus. The metabolites of these two clones were analyzed through HPLC. The result showed that their metabolites were quite different from those of the host E. coli DH5α and the host containing vector pHZ132. This study may present a new approach to exploring bioactive metabolites of sponge symbionts.     

Modeling Study of Seasonal Variation of the Pelagic-Benthic Ecosystem Characteristics of the Bohai Sea

Based on experiment data of the Sino-German comprehensive investigations in the Bohai Sea in 1998 and 1999, a simple coupled pelagic-benthic ecosystem multi-box model is used to simulate the ecosystem seasonal variation. The pelagic sub-model consists of seven state variables： phytoplankton, zooplankton, TIN, TIP, DOC, POC and dissolved oxygen （DO）. The benthic sub-model includes macro-benthos, meiobenthos, bacteria, detritus, TIN and TIP in the sediment. Besides the effects of solar radiation, water temperature and the nutrient from sea bottom exudation, land-based inputs are considered. The impact of the advection terms between the boxes is also considered. Meanwhile, the effects of the micro- bial-loop are introduced with a simple parameterization. The seasonal variations and the horizontal distributions of the ecosystem state variables of the Bohai Sea are simulated. Compared with the observations, the results of the multi-box model are reasonable. The modeled results show that about 13% of the photosynthesis primary production goes to the main food loop, 20% transfers to the benthic domain, 44% is consumed by the respiration of phytoplankton, and the rest goes to DOC. Model results also show the importance of the microbial food loop in the ecosystem of the Bohai Sea, and its contribution to the annual zooplankton production can be 60%-64%.     

Changes of taxonomical composition of Late Jurassic-Early Cretaceous palynofloras of Bureya Basin,Russia

The changes of taxonomical composition of the Late Jurassic-Early Cretaceous palynofloras are revealed,in the upper stream of Bureya River in Bureya Basin.The palynofloras are dominated as follows:the Berriasian one by ferns(Cyatheaceae,Dicksoniaceae,Osmundaceae),Classopollis and bisaccate pollen;the Valanginian-Hauterivian one by ferns(Cyatheaceae,Dicksoniaceae),Ginkgocycadophytus and bisaccate pollen;the Barremian one by ferns(Cyatheaceae,Dicksoniaceae);the Aptian one by ferns(Cyatheaceae,Dicksoniaceae,Gleicheniaceae) and Ginkgocycadophytus;and the Albian one by ferns(Schizaeaceae) and bisaccate pollen.In the Albian the floral diversity raises with the angiosperms appearing.     

Spatial distribution of integrated impact index of mega-event—A case study of Expo ′99 Kunming

Taking the affinity between events and media as a conceptualization base, a total of 1032 related news reports of Expo ＇99 Kunming, gathered from the internet data bank of China INFOBANK from 1992 to 2003, are used as data sources. After classifying them with a communication research method--the content analysis, a data bank for SPSS is set up, and a mathematic model called the Integrated Impact Index of Expo ＇99 Kunming is constituted. With the model, the spatial distribution of the total integrated impacts of Expo ＇99 Kunming on the regions or cities with different regional scales is analysed quantitatively. The conclusions are： 1） the Expo ＇99 Kunming made obvious inte- grated impacts on the regions or cities of every scale, especially in the venue city and the region--Kunming City and Yunnan Province; 2） it had corresponding impacts on other provinces; 3） the spatial distribution of Integrated Impact Index had a disaggregation with both plane extension and spotted decentralization; and 4） there was a distance decay law in all three scales of regions （Kunming City, Yunnan Province and the whole China）, which incarnated the spatial extension law of the integrated impact of a special mega-event.     

Analysis of runoff characteristics in midstream of Yinma River

To use the water resources reasonably in the midstream of Yinma River is of great significance to Changchun City which is short of water. With the runoff data of physical measuring, the paper analyses the characteristics surface rtmoff of the area, by means of the groundwater flow numerical simulation, and represents the characteristics of the groundwater runoff in the area. Based on combination analyses of the two runoffs, the authors point out the problem of the water resources use in this area and bring forward a resolution of conjunctive regulation and storage of the surface water and groundwater.     

Influence of Information Technology on Social Spatial Behaviors of Urban Residents ——Case of Nanjing City in China

Taking Nanjing as a case, the paper explains the spatial behavior differences existing in the information technology use among different groups of residents and households, by virtue of analyzing the survey data of urban households in the 11 districts of Nanjing, from the social, spatial, life and other non-technical angles. Also it makes various analyses and evaluation quantitatively and qualitatively on the social and spatial effect of information technology. The results show that the new technology is changing the social spatial behaviors of urban residents. New behavioral spaces of urban family such as telecommuting, email and QQ have begun to emerge. With the help of Internet, the communication scope of families has expanded greatly, and more new forms of publicizing community information have begun to emerge. Telecommunication contact forms have been developing swiftly, and their frequencies of con- tact have been increasing dramatically.