Chromosome Behavior of Heat Shock Induced Triploid in Fenneropenaeus Chinensis     

张晓军  李富花  相建海 《中国海洋湖沼学报》2003,21(3):222-228

INTRODUCTIONTriploidanimalsareusefulbecausetheyaresterile ,characterizedbypositivegrowthinthere productiveseason ,usefulfortesting ,forintroductionofnon nativespecies ,andforprotectionofde velopedstrains.Theinductionoftriploidyhadbeenreportedinmanyaquaculturespecies .Triploidshavebeensuccessfullyinducedinshrimpusingtemperatureshockorchemicalshock (CB ,6 DMAP)in 4species :Sicyoniaingentis (Xiangetal.,1 991 ) ,Fenneropenaeuschinensis (Xiangetal.,1 992 ;Daietal.,1 993;Baoetal.,1 993;Li…  相似文献   

EFFECT OF SULPHATE-REDUCING BACTERIA ON ELECTRO-CHEMICAL CORROSION BEHAVIOR OF 16Mn STEEL IN SEA MUD     

张经磊  侯保荣  郭公玉  孙虎元  徐岩 《中国海洋湖沼学报》2001,19(1):87-90

ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｗａｓｇｅｎｅｒａｌｌｙｃｏｎｓｉｄｅｒｅｄｐｒｅｖｉｏｕｓｌｙｔｈａｔｔｈｅｃｏｒｒｏｓｉｏｎｏｆｓｔｅｅｌｉｎｓｅａｍｕｄｗａｓｎｏｔｓｅｒｉｏｕｓ.Ｈｏｗｅｖｅｒ,ｉｔｗａｓｌａｔｅｒｆｏｕｎｄｔｈａｔｔｈｅｃｏｒｒｏｓｉｏｎｒａｔｅｏｆｓｔｅｅｌｉｎｓｏｍｅｓｅａｍｕｄｗａｓｈｉｇｈｅｒｔｈａｎｔｈａｔｉｎｓｅａｗａｔｅｒ(Ｋｉｎｇ,1980;Ｓｅｈｍｉｄｅ,1982;Ｇｕｏｅｔａｌ.,1997;Ｈｏｕ,1998).Ｔｈｅｒｅａｒｅｓｏｍｅｒｅｐｏｒｔｓｔｈａｔｔｈｅｃｏｒｒｏｓｉｏｎｒ…  相似文献   

RELAXING ASSUMPTIONS OF PERFECT INFORMATION IN PARK VISITATION MODELS*     

Daniel J. Stynes  Daniel M. Spotts  John R. Strunk 《The Professional geographer》1985,37(1):21-28

Variables related to urban park awareness are identified and methods for relaxing assumptions of perfect information in park use models are discussed. Park awareness is related to park characteristics (age and degree of development of the park), population characteristics (race, age, length of residence, recreation participation), and distance. Park attributes are stronger predictors of both park awareness and use than is distance. These findings parallel similar research on the cognitive aspects of shopping decisions.  相似文献   

Structural characterization of deep-water deposits in a foreland basin, Silla Syncline (Chilean Patagonia), with applications to depositional processes     

Joseph Gonzales  Atilla Aydin 《Journal of Structural Geology》2008,30(9):1095-1108

Based on our detailed structural characterization, we examine possible relationships between thrust faults and strike-slip faults and thrust-cored folds and depositional units in the Silla Syncline, a 4 km wide fold composed of fine-grained mudstone, coarse sandstone and conglomerate deposits of the Cerro Toro Formation in the Magallanes foreland basin, Chilean Patagonia. The syncline is bounded on its western flank by an asymmetric anticline and on its eastern flank by a broad zone of thrust faults and associated folds, which are oriented sub-parallel to the syncline axis. Deposition of the coarse-grained units of the Silla Syncline appears to have taken place in this structurally defined trough controlled primarily by thrust fault related growth structures flanking the syncline.The syncline and surrounding area have also been deformed by two sets of strike-slip faults, one right-lateral and one left-lateral. The strike-slip and thrust faulting operated contemporaneously for much of their active periods, although it appears that thrust faulting, confined within the fine-grained units, initiated slightly earlier than strike-slip faulting. In addition, younger igneous intrusions at high angle to bedding generally localize along the strike-slip faults. The cross-cutting relationships among the intrusions, strike-slip faults, and flexural slip faults show that all these structures were active during the same period, which extends beyond mid-Miocene.These conclusions support the premise that structures in deep-water sediments are important for understanding not only the deformation of a foreland basin, but also its depositional architecture.  相似文献   

Evaluation of coal bed methane potential of coal seams of Sawang Colliery,Jharkhand, India     

Anil M. Pophare  Vinod A. Mendhe  A. Varade 《Journal of Earth System Science》2008,117(2):121-132

The coal seams of Sawang Colliery, East Bokaro Coalfields are bituminous to sub-bituminous in nature and categorized as high gaseous seams (degree II to degree III level). These seams have the potential for coal bed methane (CBM) and their maturity increases with increasing depth, as a result of enhanced pressure-temperature conditions in the underground. The vitrinite maceral group composition of the investigated coal seams ranges from 62.50–83.15%, whereas the inertinite content varies from 14.93–36.81%. The liptinite content varies from 0.66% to 3.09%. The maximum micro-pores are confined within the vitrinite group of macerals. The coal seams exhibit vitrinite reflectance values (Ro% calculated) from 0.94% (sample CG-97) to 1.21% (sample CG-119). Proximate analyses of the investigated coal samples reveal that the moisture content (M%) ranges from 1.28% to 2.98%, whereas, volatile matter (VM%) content is placed in the range of 27.01% to 33.86%. The ash content (A%) ranges from 10.92% to 30.01%. Fixed carbon (FC%) content varies from 41.53% to 55.93%. Fuel ratio variation shows a restricted range from 1.53 to 1.97. All the coal samples were found to be strongly caking and forming coke buttons. The present study is based on the adsorption isotherm experiments carried out under controlled P-T conditions for determination of actual gas adsorption capacity of the coal seams. This analysis shows that the maximum methane gas adsorbed in the coal sample CG-81 is 17 m³/t (Std. daf), at maximum pressure of 5.92 MPa and experimental temperature of 30°C. The calculated Langmuir regression parameters P_L and V_L range from 2.49 to 3.75 MPa and 22.94 to 26.88 m³/t (Std. daf), respectively.  相似文献   

土壤酶对碘离子在土壤中吸附行为的影响   总被引：1，自引：0，他引：1  

吴世军  陈繁荣  程俊  杨永强  吕莹  康明亮 《地球化学》2008,37(1):37-44

以批式试验法研究了微生物、葡萄糖氧化酶、脲酶、纤维素酶及其催化底物葡萄糖、尿素和纤维素对Ⅰ-在土壤中吸附的影响,结果表明微生物能显著提高Ⅰ-吸附量,但葡萄糖氧化酶、脲酶、纤维素酶及葡萄糖、尿素和纤维素对Ⅰ-吸附并无促进作用.葡萄糖氧化酶及葡萄糖含量在小于100 mg/L时对Ⅰ-吸附无影响,1000 mg/L时与Ⅰ-呈竞争吸附;脲酶及尿素随浓度增大,对Ⅰ-吸附的抑制作用变得明显;1～1000 mg/L范围内,纤维素酶和纤维素对Ⅰ-吸附没有影响;但葡萄糖氧化酶和葡萄糖生成的中间产物可促进土壤对Ⅰ-的吸附.平衡液中溶解性有机碳(DOC)含量随时间增加而逐渐降低,有机质浓度越大,降低趋势越明显.  相似文献   

沸石强化过滤的中试及生产性试验研究   总被引：2，自引：0，他引：2  

丁磊  王萍 《矿物学报》2008,28(3)

对新型水处理材料沸石强化常规给水处理工艺进行了中试和生产性试验,并与石英砂滤料做了对比.中试结果表明粒径为0.80-1.20mm沸石对浊度、氨氮、有机物都表现出良好的去除效果,过滤时的水头损失、反冲洗强度明显小于石英砂,不仅能满足反冲洗要求,还可节省反冲洗水量,降低运行成本.在生产性试验条件下,沸石对浊度、氨氮、耗氧量的去除率分别为95%、83%和39%.因此,在当前水源水遭到污染的情况下,用沸石替代石英砂滤料可明显改善水质,在不增加处理构筑物的情况下,对给水处理工艺可起到强化作用  相似文献   

Improved techniques for studying the temporal and spatial behavior of fish in a fixed location     

Ehrenberg  John E; Steig  Tracey W 《ICES Journal of Marine Science》2003,60(3):700-706

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Three-dimensional swimming behavior of individual zooplankters: observations using the acoustical imaging system FishTV     

McGehee  Duncan; Jaffe  Jules S. 《ICES Journal of Marine Science》1996,53(2):363-369

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Full-range nonlinear analysis of fatigue behaviors of reinforced concrete structures by finite element method     

Song Yupu  Zhao Shunbo  Wang Ruimin  Li Shuyao 《海洋学报(英文版)》1994,13(1):143-154

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