低值鱼蛋白多肽-铁（Ⅱ）螯合物的酶解制备及其抗氧化、抗菌活性     

邓尚贵杨燊  秦小明 《广东海洋大学学报》2006,26(4):54-58

以南海低值鱼蛋白为原料，采用木瓜蛋白酶和风味酶的复合酶水解得到多肽水解物（HP），并制备多肽．铁（Ⅱ）螯合物，对螯合工艺及螯合产物的结果及抗氧化和抗菌功能特性进行了初步研究。结果表明：1）水解度为5％的多肽与铁（Ⅱ）螯合效果最佳，螯合率为94．15％；2）化学分析及红外光谱表明活性肽与亚铁离子螯合并形成稳定结构的螯合物；（3）经过50％乙醇（体积分数）沉淀的螯合铁具有明显的抗氧化活性，其抗氧化作用相当于维生素E的90％，经过80％乙醇（体积分数）沉淀的螯合物具有显著的抗枯草牙孢杆菌和金黄色葡萄球菌活性，其抑菌圈均直径为13mm。  相似文献   

湛江高桥红树林区鱼类调查     

叶宁  吴晓东  张苇 《广东海洋大学学报》2007,27(6):55-61

2002、2005和2006年7~8月,对广东省湛江市高桥红树林区的鱼类进行了调查,共采集到鱼类75种,隶属于13目38科,其中鲈形目有40种,占53.3%,是高桥红树林区鱼类主要种类。测定了主要鱼类的体重、数量、大小、分析了其食性。  相似文献   

Current Dynamics of Estuarine Circulation in the Lateral Boundary Layer     

U. Raudsepp 《Estuarine, Coastal and Shelf Science》1998,47(6):715-730

High spatial resolution measurements of current velocity performed by the shipboard mounted Acoustic Doppler Current Profiler (ADCP) in the lateral boundary layer of the southern Gulf of Finland during two 5-day periods are described and analysed with a focus on the dominant dynamics. The measurement site represents a small (15×20 km), relatively deep (up to 100 m) bay opened to large-scale estuarine circulation. The measurement period was characterized by calm winds and a strong seasonal pycnocline (Brunt-Väisälä frequencyN=6–9*10⁻² s⁻¹). The quasi-steady velocity field revealed polarization of currents along the shore whereas an intensive baroclinic coastal jet was observed over a cross-shore scale of 1–2 km. The level of vertical separation of the alongshore flow coincided with the pycnocline at the coast, but was shifted below it in the offshore region. The cross-shore flow was considerably weaker and showed a three-layer structure with an opposite phase between the first and second surveys. It is suggested that the observed jet resembles a non-locally forced eastward propagating coastally trapped wave. In the offshore area the alongshore flow field satisfies local geostrophic balance quite well, except in the pycnocline where strong vertical stratification exerts considerable vertical stress. As vertical velocity shear is well correlated with vertical stratification, the horizontal advection prevails over vertical mixing. Horizontal inhomogeneities of density distribution are partly explained by vertical velocities with an estimated magnitude of less than 0·6 mm/s and the spatial pattern following bottom topography.  相似文献   

Reconstructing the Younger Dryas ice dammed lake in the Baltic Basin: Bathymetry, area and volume   总被引：1，自引：0，他引：1  

Martin Jakobsson  Svante Bjrck  Gran Alm  Thomas Andrn  Greger Lindeberg  Nils-Olof Svensson 《Global and Planetary Change》2007,57(3-4):355-370

A digital 3D-reconstruction of the Baltic Ice Lake's (BIL) configuration during the termination of the Younger Dryas cold phase (ca. 11 700 cal. yr BP) was compiled using a combined bathymetric–topographic Digital Terrain Model (DTM), Scandinavian ice sheet limits, Baltic Sea Holocene bottom sediment thickness information, and a paleoshoreline database maintained at the Lund University. The bathymetric–topographic DTM, assembled from publicly available data sets, has a resolution of 500 × 500 m on Lambert Azimuthal Equal Area projection allowing area and volume calculations of the BIL to be made with an unprecedented accuracy. When the damming Scandinavian ice sheet margin eventually retreated north of Mount Billingen, the high point in terrain of Southern central Sweden bordering to lower terrain further to the north, the BIL was catastrophically drained resulting in a 25 m drop of the lake level. With our digital reconstruction, we estimate that approximately 7800 km³ of water drained during this event and that the ice dammed lake area was reduced by ca. 18%. Building on previous results suggesting drainage over 1 to 2 years, our lake volume calculations imply that the freshwater flux to the contemporaneous sea in the west was between about 0.12 and 0.25 Sv. The BIL reconstruction provides new detailed information on the paleogeography in the area of southern Scandinavia, both before and after the drainage event, with implications for interpretations of geological records concerning the post-glacial environmental development.  相似文献   

金枪鱼油的精炼工艺对脂肪酸组成的影响     

刘书成章超桦  洪鹏志吉宏武 《广东海洋大学学报》2006,26(1):40-44

粗鱼油通过精炼可以除去非甘油三酯杂质成分，研究表明黄鳍金枪鱼鱼油精炼的工艺参数为：800g，L的H3PO4脱胶，添加量为油量的1％（体积分数）；300g／L的Na0H脱酸，添加量为油量的2％（体积分数）；活性土脱色。添加量为油量的10％（质量分数）；85℃下减压蒸馏脱臭15min。经过精炼，鱼油呈淡黄色，澄清透明，有淡鱼腥昧，理化指标达到鱼油SC/T3502—2000标准的精制鱼油一级要求，精制鱼油中PUFA的总含量（w）达37．06％，DHA和EPA含量（w）分别为25．10％和4．45％。  相似文献   

Evaluation of the damage in fish spermatozoa cryopreservation   总被引：4，自引：0，他引：4  

李军刘清华  张士璀 《中国海洋湖沼学报》2006,24(4):370-377

Cryodamages occur during sperm cryopreservation. Cryopreservation of fish sperm usually results in marked decrease in sperm quality, such as swelling or disruption of the plasma membrane, mitochondrial dysfunction, diminished sperm motility, impaired velocity, shorter motility period, denaturation, and release of some enzymes from spermatozoa. In this paper, damages in morphology, physiology, biochemistry and metabolism, and genetic integrity of fish semen after cryopreservation are discussed. New approaches in assessment of fish thawed sperm quality such as computer assisted sperm analysis, flow cytometic analysis combined with fluorescent probes and single cell gel electrophoresis are also briefly reviewed.  相似文献   

鮻作为清洁者在养殖系统中理论混养量的计算方法     

康斌  线薇薇 《广东海洋大学学报》2007,27(3):74-77

通过量化计算鱼类鮻在养殖生态系统中鮻总氮清洁能力,利用数学叠代和逼近法构建量化鮻动态清洁能力的模型,精确计算鮻混养量理论值。运算结果表明:初始放养量为1 kg的鮻在水温21℃、90 d的养殖周期中清除有机颗粒氮469.60 g,自身作为养殖附加产品产出量为1542.01 g。  相似文献   

Thin superficial layer and lateral heterogeneities in southern Sweden using short-period Rayleigh-wave dispersion     

Kjell Åström  Carl-Erik Lund 《Geophysical Journal International》1994,118(1):231-244

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A review of the origins of endemic species in Lake Biwa with special reference to the goby fish,Chaenogobius isaza     

Sachiko Takahashi 《Journal of Paleolimnology》1988,1(4):279-292

The 1400 m deep drilling of Lake Biwa has revealed that the lake probably originated ca. 5 · 10⁶ yr ago. After a geographic shift to its present position, and by more than 3.10⁵ yr ago, it had become a large and deep lake. The considerable longevity, large size and high diversity of habitats of this lake are considered to have contributed to its high abundance of endemic taxa. These taxa fall into two categories: (1) relict species of the Asiatic continent, higher latitude or marine origin; (2) species differentiated in the lake from littoral-lacustrine species, and having adapted to habitats peculiar to Lake Biwa. I discuss some of these endemic organisms, briefly review recent in vestigations on fossil organisms of the lake, and more fully discuss the origin of a representative endemic species, the pelagic gobiid fish Chaenogobius isaza Tanaka. This species is regarded as having differentiated from some littoral Chaenogobius species, creating a novel niche in the open water area after Lake Biwa was established as a deep lake.This is the seventh of a series of papers to be published by this journal that was presented in the paleolimnology sessions organized by R. B. Davis and H. Löffler for the XIIth Congress of the International Union for Quaternary Research (INQUA), which took place in Ottawa, Canada in August 1987. Drs. Davis and Löffler are serving as guest editors of this series.  相似文献   

The population dynamics of O-group flatfish on nursery grounds in the Clyde Sea Area     

M.G. Poxton  A. Eleftheriou  A.D. McIntyre 《Estuarine, Coastal and Shelf Science》1982,14(3):265-282

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