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黄鳍鲷不同组织同工酶的研究 总被引：13，自引：2，他引：13
运用聚丙烯酰胺垂直梯度凝胶电泳法对黄鳍鲷的7种组织(心肌、肝脏、肾脏、肌肉、性腺、脾脏、脑)进行了4种同工酶(EST，LDH，MDH，ME)的初步研究，并对几种酶的同工酶位点及酶谱表型进行了分析。结果表明：黄鳍鲷的4种同工酶系统具有明显的组织特异性。同时还分析了聚丙烯酰胺垂直梯度凝胶电泳法对同工酶电泳的分离效果，认为该种方法对同工酶系统的分辨率高，分离效果好，可得到更精确的结果。 相似文献
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克氏原螯虾LDH同工酶的组织特异性研究 总被引：1，自引：0，他引：1
以克氏原螯虾为材料，采用聚丙烯酰胺凝胶电泳方法，分析了肌肉、眼球、肝胰腺和心脏4种组织和器官中乳酸脱氢酶（LDH）同工酶的表达情况。结果发现，眼球中出现Ldh-5和Ldh-62条酶带，肌肉中出现Ldh-1、Ldh-2、Ldh-3、Ldh-4、Ldh-5共5条酶带．肝胰腺中只出现Ldh-61条酶带，心脏中出现Ldh-3和Ldh-5共2条带。在这些检测到的酶带中，肌肉中Ldh-5活性最强，染色最深。实验结果表明，不同组织中LDH的同工酶的表达存在差异。表现出明显的组织特异性。 相似文献
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口虾蛄(Oratosquilla oratoria)同工酶的组织特异性及生化遗传分析 总被引：3，自引：0，他引：3
采用聚丙烯酰胺凝胶垂直平板电泳方法，研究分析了口虾蛄(Oratosquilla oratoria)肌肉、眼球、腹鳃、心脏和肝胰腺5种器官或组织中LDH、ADH、MDH、SDH、MEP、POD、AMY、GDH、SCD、EST、GLDH和SOD共12种同工酶的表达情况。结果表明，口虾蛄同工酶的表达具有明显的组织特异性。对12种同工酶进行生化遗传分析，获得了基本酶谱。12种同工酶共记录出35个基因座位，其中11个基因座位Ldh-3、Adh-1、Sdh-2、Est-1、Est-2、Est-3、Mdh、Mep-7、Gldh-1、Gldh-2和Scd-1为多态，其多态座位比例为31.43％。 相似文献
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中国对虾两个种群的F_1的LDH和MDH同功酶初步分析 总被引：1，自引：0，他引：1
采用不连续聚丙烯酰胺凝胶垂直平板电泳法，分析了黄、渤海南移和珠江口北移的中国对虾Ｐｅｎａｅｕｓｏｒｉｅｎｔａｌｉｓ及其杂交于一代的乳酸脱氢酶（ＬＤＨ）和苹果酸脱氨酶（ＭＤＨ）同工酶。结果表明：这两种同工酶具明显的组织特异性，均只在尾部肌肉表达。ＬＤＨ同工酶表现为紧密相邻的两条带。ＭＤＨ的表达谱式与其它物种类似，表现为趋向阳极的上清液型和趋向阴极的线粒体型。本研究分析的两种同工酶未见两种来源的中国对虾及其杂交子一代的差异。文中对此进行了讨论。 相似文献
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鲈鱼群体生化遗传学研究 Ⅰ.同工酶的生化遗传分析 总被引：25，自引：6，他引：25
于1994年9月－1995年12月，在青岛近海采集37尾鲈鱼的生化样品，采用淀粉胶和聚丙烯酰胺凝胶2种电泳分析，分析了LDH、MDH、MEP、IDHP、PGM、G3PDH、AK、CK、ADH、SDH、G6PDH、GDH、PGDH、CAT、MPI、EST、SOD等同工酶在鲈鱼眼睛、肌肉、心脏、肝脏、肾脏、鳃、胸鳍等7种组织或器官中的表达情况，并对同工酶表型进行了生化遗传分析，以期为其种质资源保护和开发，以及遗传育种等方面的研究提供基础资料。结果表明，17种同工酶由31个基因座位编码，其中Mep-1,Pgm-1,Sdh,Gdh,Pgdh,Mpi,Est-1,Est-4等8个基因座位为多态。多态座位比例为25．8％。 相似文献
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鲈鱼群体生化遗传学研究 Ⅰ.同工酶的生化遗传分析 总被引：2，自引：0，他引：2
于1994年9月—1995年12月，在青岛近海采集37尾鲈鱼的生化样品，采用淀粉胶和聚丙烯酰胺凝胶2种电泳方法，分析了LDH、MDH、MEP、IDHP、PGM、G3PDH、AK、CK、ADH、SDH、G6PDH、GDH、PGDH、CAT、MPI、EST、SOD等同工酶在鲈鱼眼睛、肌肉、心脏、肝脏、肾脏、鳃、胸鳍等7种组织或器官中的表达情况，并对同工酶表型进行了生化遗传分析，以期为其种质资源保护和开发，以及遗传育种等方面的研究提供基础资料。结果表明，17种同工酶由31个基因座位编码，其中Mep-1、Pgm-1、Sdh、Gdh、Pgdh、Mpi、Est-1、Est-4等8个基因座位为多态。多态座位比例为25 8%。 相似文献
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采用高pH不连续系统聚丙烯酰胺垂直板凝胶电泳,特异性组织化学染色对中华绒螯蟹(Eriocheir sinensis)的血清、肌肉、鳃、心脏、肝胰腺、精巢和精子等组织的乳酸脱氢酶(LDH)同工酶酶谱进行了研究。同时,利用2种底物(乳酸钠和α-羟基丁酸钠)进行了特异性反应,并对其精子特异性乳酸脱氢酶进行了研究。结果表明:以乳酸钠为底物时,中华绒螯蟹的肌肉、鳃、血清和心脏有2条谱带,而精巢和精子有3条谱带,但在肝胰腺中未发现谱带;以α-羟基丁酸钠为底物时,只在血清、精巢和精子发现有1条谱带。从而说明,中华绒螯蟹乳酸脱氢酶同工酶存在组织特异性;精子存在特异性乳酸脱氢酶。 相似文献
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Arne Schnack-Friedrichsen Angela M. Davis Jim D. Bennell Dei G. Huws 《Marine Georesources & Geotechnology》2001,19(4):221-243
The interdependence between the seismo-acoustic properties of a marine sediment and its geotechnical/physical parameters has been known for many years, and it has been postulated that this should allow the extraction of geotechnical information from seismic data. Though in the literature many correlations have been published for the surficial layer, there is a lack of information for greater sediment depths. In this article, a desktop study on a synthetic seafloor model illustrates how the application of published near-surface prediction equations to subsurface sediments (up to several tens of meters burial depth) can lead to spurious predictions. To test this further, acoustic and geotechnical properties were measured on a number of sediment core samples, some of which were subjected to loading in acoustically-equipped consolidation cells (oedometers) to simulate greater burial depth conditions. For low effective pressures (representing small burial depths extending to around 10 meters subsurface), the general applicability of established relationships was confirmed: the prediction of porosity, bulk density, and mean grain size from acoustic velocity and impedance appears generally possible for the investigated sedimentary environments. As effective pressure increases through, the observed relationships deviate more and more from the established ones for the near-surface area. For the samples tested in this study, in some instances increasing pressure even resulted in decreasing velocities. There are several possible explanations for this abnormal behavior, including the presence of gas, overconsolidation, or bimodal grain size distribution. The results indicate that an appropriate depth correction must be introduced into the published prediction equations in order to obtain reliable estimates of physical sediment properties for greater subsurface depths. 相似文献
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Shigehisa Nakamura 《Marine Geodesy》2000,23(1):55-61
Specific properties of the interannual sea level variations and annual tides in the Northwestern Pacific were studied. Several tide stations were monitored. The monthly mean sea level for the year of 1995 was analyzed at each tide station. A seismic event in 1995, some tectonic activity around the subject area, and the Kuroshio (the oceanic western boundary current) may possibly contaminate results which would have occurred from the astronomical annual tide alone. 相似文献
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The effect of different fixation and storage protocols on the flow cytometric (FCM) simultaneous analysis of bacterioplankton and phytoplankton in coastal seawater samples (Mediterranean coastal lagoons) was investigated. FCM measurements (cell number, fluorescence and scatter characteristics) were obtained through DAPI staining. Three fixatives [glutaraldehyde (GA), formaldehyde (FA) and paraformaldehyde (PFA)] and two storage (3 months duration) methods (5 °C and −196 °C) were tested. Two dominant populations were detected in studied samples: bacteria and eukaryotic picophytoplankton. Adding fixatives (2% final concentration) appears necessary to obtain FCM exhaustive counts of all the bacteria and phytoplanktonic cells. This was related to the permeation effect of fixatives which allowed a better DAPI staining of the cells. Maximum fluorescence, i.e. optimal staining of the cells was obtained with FA or PFA, and significant lower fluorescences with GA. Fixed samples stored at 5 °C induced rapid cell loss. Only storage in liquid nitrogen of samples fixed with FA or PFA, allows mid-term (≥4 months) preservation of bacteria or picophytoplankton cell numbers, and limited evolution of DAPI-induced fluorescence and scatter characteristics. 相似文献
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《海洋学报(英文版)》2014,(9):F0003-F0003
<正>Acta Oceanologica Sinica(AOS)is a comprehensive academic journal edited by the Editorial Committee of Acta Oceanologica Sinica and is designed to provide a forum for important research papers of the marine scientific community which reflect the information on a worldwide basis.The journal publishes scholarly papers on marine science and technology,including physics,chemistry,biology, 相似文献
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The relationship between the flux of exotic benthic foraminiferal tests (i.e. tests which are supplied from open-sea sources alone) in a tidal inlet and that of bulk sediment was analysed, which can be expressed as two first-order linear equations. According to this relationship, in order to determine net sediment transport directions in the entrance, the test concentration in surficial sediments of the tidal basin can be compared against a ‘ critical level ’. The critical level is determined for the conditions that no net transport of bulk sediment is present within the entrance. If the observed concentration (averaged over the tidal basin) is higher than the simulated critical level, then the net sediment transport is directed to landward. This method is applied to the analysis of net sand transport at Christchurch Harbour, a tidal inlet system located in southern England. In this investigation, concentrations of exotic foraminiferal tests in the surficial sediments of the tidal basin and ebb tidal delta area were obtained from the analysis of sea-bed sediment samples. A series of probable critical levels were calculated based upon the data sets with regard to: (1) sediment discharge from the rivers; (2) magnitude of sediment discharge within the entrance during the ebb; (3) the test concentration outside the harbour; (4) the thickness of the moving layer; and (5) two parameters associated with dispersive processes. The results show that the concentration in the tidal basin sediment is higher than a number of simulated critical concentrations for representative cases. Consequently, the high level of the concentration of exotic benthic foraminiferal tests within the harbour should be explained as a result of landward net transport of sands within the entrance. 相似文献
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Rahul Sharma 《Marine Georesources & Geotechnology》2000,18(3):237-250
Observations on seafloor features from subbottom profiling and seabed photography data show that the undisturbed and natural conditions before the benthic disturbance undergo a substantial change after operation of the disturber. The effects can be seen in the form of deep trenches and grooves, formed by the action of the sleds and the pumping of the sediment along its path, as well as sediment piles on either side of the track. Biological traces such as fecal coils, casts, tubes, burrows, and trails get obliterated in the areas of disturbance and resedimentation. The smooth, uniform nature of the seafloor observed in predisturbance phase shows microtopographic changes in and around the disturbed area as a result of sediment excavation and resettlement. Vertical mixing as well as lateral transport of sediment alter the geological, biological, physical, and chemical conditions on the seafloor, which need to be monitored over time to assess the process and the time taken for restoration of environmental conditions. 相似文献
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Vance P. Vicente 《Marine Ecology》1989,10(2):179-191
Abstract. Long-term changes in the distributional patterns of commercial sponges ( Spongia spp. and Hippospongia spp.) within the West Indian Region indicates that: 1) commercial sponges had a widespread distribution throughout the whole West Indian Region and were ubiquitous in very shallow water until about the first half of the present century; 2) they were fished commercially not only in the traditional northern Caribbean sites (Florida, Gulf of Mexico, Bahamas) but also in the Greater ( e. g. , Hispaniola, Jamaica) and Lesser Antilles; and 3) they became extinct throughout most of the Lesser Antilles ( e. g. , Puerto Rico, Vieques, St. Thomas) sometime during the first half of this century. Mortalities of spongiids within the Antilles were found to differ from other marine mortalities in that: 1) species disappeared from a large region; 2) species vanished from different habitats and depths; and 3) natural populations never recovered. Species richness patterns suggest that commercial sponge genera ( Spongia and Hippospongia ) evolved under slightly cooler elimatic conditions than those found at present, and that these extinctions occurred as a direct or indirect effect of positive thermal anomalies in sea surface and atmospheric temperatures between 1900–1950. The concept that species diversity is stable on a regional scale is questioned. 相似文献
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The behaviour of an axially pre-loaded cylindrical member of an offshore structure, hit by a supply ship, has been investigated. The effects of axial pre-loading on the dynamic properties of members, the extent of damage and propagation of dynamic instability in the tubular members have also been investigated. Numerical models have been validated using available experimental data from the literature although these are mostly static with no pre-loading. Axial pre-loading was found to change the dynamic characteristics of some cylindrical members quite dramatically while it had no significant effect on others. The study examined whether there was any change in the behaviour between local and global modes when the loading was dynamic rather than static. The effect of damping on the dynamic instability of axially pre-loaded tubes under lateral dynamic loads was also studied. It was observed that for some geometries the quasi-static response can be used to define the boundary between bounded and unbounded dynamic responses. The main contribution of this study, compared with previous investigations reported in the literature, is that both pre-loading and dynamic effects have been included. 相似文献