海洋鱼类生化组成及能量含量的研究   总被引：2，自引：0，他引：2  

张敏  张波  李春雁 《中国海洋大学学报(自然科学版)》2007,37(3):385-390

随着海洋生态系统动力学研究的深入，海洋鱼类生化组成及能量含量的研究越来越显现出它的重要性和必要性。建立生化组成与能量含量与鱼体某个易于测定的指标（如水分含量、体重、体长、肥满度等）之间显著的相关关系，则可以较方便、准确地对有关指标进行间接估计。本文对国内外此领域研究现状进行分析、评述，以期进一步探讨饵料营养质量变化对食物产出的影响。  相似文献   

植物生长激素对海洋光合细菌生长及净化氮、磷能力影响的研究     

刘影  李兰生  孙涛 《海洋通报》2006,25(3):92-96

从青岛栈桥附近海域的底泥中分离出了光合细菌菌株,研究了三十烷醇、赤霉素和α-萘乙酸对其生长与净化PO4-P和NH4-N能力的影响,以期获得快速培养光合细菌的方法。结果表明这三种植物生长激素对海洋光合细菌的生长均有促进作用。其中赤霉素的促进作用最明显,其最佳质量浓度为0.5mg/L,经12d培养后,细菌浓度比对照样可提高153.9%。三十烷醇和α-萘乙酸的最佳质量浓度均是1.0mg/L,分别可提高90.7%和20.6%。同时光合细菌净化PO4-P和NH4-N能力也有所提高,并且植物生长激素的促生作用愈明显,PO4-P和NH4-N的去除率愈高。试验表明在增殖培养中,可以添加某些植物生长激素来促进光合细菌的生长。  相似文献   

海洋活性多肽的研究进展   总被引：17，自引：0，他引：17  

管华诗  韩玉谦  冯晓梅 《中国海洋大学学报(自然科学版)》2004,34(5):761-766

根据海洋活性多肽是近年来新药研究热点的现状 ,本文对天然存在的海洋活性多肽和海洋蛋白酶解活性肽的研究进展进行了综述。为进一步开展海洋活性多肽的研究提供参考。  相似文献   

海洋微藻多糖提取纯化条件的研究   总被引：4，自引：0，他引：4  

吴曼  李文权  张赛金  陈清花 《海洋技术学报》2004,23(1):9-12

研究了提取介质、超声条件和洗脱条件对海洋微藻多糖提取纯化效果的影响。实验结果表明不同pH的提取介质可以提取得到不同种类的多糖，超声条件以300W、20min最佳，用葡聚糖凝胶Sephadex-G200柱(长50cm，直径2cm)纯化粗多糖，当加样量为4ml，用0．2mol／L NaCl溶液洗脱效果最好。  相似文献   

UV-B辐射对2种海洋微藻的生理效应   总被引：2，自引：5，他引：2  

徐达  唐学玺  张培玉 《中国海洋大学学报(自然科学版)》2003,33(2):240-244

应用同位素标志法 ,研究了 UV- B辐射增强对三角褐指藻、扁藻核酸和蛋白质合成动态的影响。结果表明 ,三角褐指藻对 UV- B辐射增强的耐受性高于扁藻 ;UV- B辐射增强抑制扁藻的生长和 DNA的合成 ;低剂量的 UV- B辐射刺激三角褐指藻的生长和 DNA的合成 ;高剂量则表现出抑制作用。同时 ,随着 UV- B辐射的增强 ,2种海洋微藻 RNA和蛋白质的合成速度下降 ,其中扁藻合成速度的下降幅度明显大于三角褐指藻 ,表明三角褐指藻 RNA和蛋白质的合成对 UV- B辐射增强的敏感性低于扁藻。  相似文献   

Particulate matter and chemical-physical conditions of an inner sea: The Mar Piccolo in Taranto. A new statistical approach     

G. Alabiso  M. Cannalire  D. Ghionda  M. Milillo  G. Leone  O. Caciorgna 《Marine Chemistry》1997,58(3-4)

As part of the environmental recovery plan for the Mar Piccolo (Ionian Sea), a basin suffering especially from urban pollution, a study was planned on the modifications induced by the human activities to distinguish them from those due to the alternation of the seasons and the exchanges with the neighbouring basin of Mar Grande. The present paper deals with the chemical-physical characteristics of sea water and its particulate matter content is investigated as a part of this study. The physical, chemical and biological variables (stochastic variables for the model) are: chlorophyll a, proteins, carbohydrates, organic matter, dry weight, temperature, salinity, dissolved oxygen, pH, ultraviolet absorbance, phosphate, nitrite, nitrate, ammonia, silicate, photosynthetically available radiation (PAR) and energy. These variables have been sampled at 15 different stations during one year of monthly sampling. A preliminary analysis was carried out on the variables for detecting possible interactions among all the investigated parameters. To this purpose, and for all the variables, an original computer program for non-parametric statistical-evaluation and data-correlation was used to find correlation-guided hierarchy of variables. The relations among: Prot and Chl-a, Carb and Chl-a and OM and DW have been studied. The slopes of linear regression of (Prot, Chl-a) and (Carb, Chl-a) allowed us to detect different relations at different space-time areas. A nonlinear relation between OM and DW has been found as well. This treatment is a first approach to the construction of a mathematical model of the basin. Different areas, for sea water characteristics, were observed to occur in the basin, despite its small extension. This may be due to the reduced water exchanges and the different residential development along the coast. Innermost areas, less involved in the water mass circulation, were more affected by eutrophication.  相似文献   

Physical properties of a porcellanite layer (Southwest Indian Ridge) constrained by geophysical logging     

Sebastian Gerland  Gerhard Kuhn  Gerhard Bohrmann 《Marine Geology》1997,140(3-4):415-426

A distinct porcellanite layer from the Southwest Indian Ridge intercalated in Pleistocene diatom ooze was studied using nondestructive physical property measurements and sedimentological data. This bed was sampled by two piston cores at a water depth of 2615 m. The 3–5 cm thick porcellanite layer appears in the cores at a depth of 6.03 m (Core PS2089-2) and 7.73 m (Core PS2089-1) below the seafloor. Due to its characteristic physical properties the porcellanite bed can be detected with core measurements, and its distribution and lateral extent mapped with echosounding. The physical index properties, wet bulk density and electrical resistivity, increase significantly across this bed. Magnetic susceptibility is used to compare the lithological units of both cores and to distinguish whether resistivity anomalies are caused by a higher amount of terrigenous components or by the presence of porcellanite. The porcellanite has the special characteristic to affect a positive anomaly in resistivity but not in susceptibility. Most marine sediments, in contrast, show a positive correlation of magnetic susceptibility versus electrical resistivity; therefore a combination of electrical resistivity and magnetic susceptibility logs yields a definite detection of the porcellanite bed. Images from the X-ray CT survey indicate that the porcellanite is lithified and brittle and fragmented when the piston corer penetrated the bed.  相似文献   

栉孔扇贝体内类支原体样生物的分离纯化   总被引：2，自引：1，他引：2  

李登峰  吴信忠 《海洋学报》2002,24(4):141-144

栉孔扇贝(Chlamys farreri)是我国北方诸省传统的一种养殖贝类.自20世纪90年代以来,北方海域养殖的栉孔扇贝灾难性的死亡事件屡有发生,1997年最甚.该贝一般呈现两个死亡高峰期:其一为春季(3～5月)死亡,在有些海区死亡率达50%以上;其二为夏季高温期(6～9月)死亡,一般在持续27℃以上高温天气(如在8月)死亡尤为严重,此期内死亡率高达80%以上,甚至有的海区100%死亡[1]1).  相似文献   

Glacial–interglacial variations in Quaternary production of marine organic matter at DSDP Site 594, Chatham Rise, southeastern New Zealand margin     

Elizabeth A. Kowalski  Philip A. Meyers 《Marine Geology》1997,140(3-4):249-263

CaCO₃ and total organic carbon concentrations, organic matter C/N and carbon isotope ratios, and sediment accumulation rates in late Quaternary sediments from DSDP Site 594 provide information about glacial–interglacial variations in the delivery of organic matter to the Chatham Rise offshore of southeastern New Zealand. Low C/N ratios and nearly constant organic δ¹³C values of −23‰ indicate that marine production dominates organic matter supply in both glacial and interglacial times during oxygen isotope stages 1 through 6 (0–140 ka) and 17 through 19 (660–790 ka). Increased organic carbon mass accumulation rates in isotope stages 2, 4, 6, and 18 record enhanced marine productivity during glacial maxima. Excursions of organic δ¹³C values to ca. −29‰ in portions of isotope stage 2 suggest that the local concentration of dissolved CO₂ was occasionally elevated during the last glacial maximum, probably as a result of short periods of lowered sea-surface temperature. Dilution of carbonates by clastic continental sediment generally increases at this location during glacial maxima, but enhanced delivery of land-derived organic matter does not accompany the increased accumulation of clastic sediments.  相似文献   

牛蒡菊糖及其制备方法的研究   总被引：22，自引：0，他引：22  

郝林华  陈靠山  李光友 《中国海洋大学学报(自然科学版)》2004,34(3):423-428

研究从牛蒡根中提取菊糖并进行纯化的方法.选择固液比、提取温度、提取时间、提取次数4个因素作为单因素进行梯度实验,确定其条件范围,并采用正交设计法优化提取条件,得到牛蒡菊糖提取的最佳因素组合:固液比1:10,温度70℃,提取时间90min,提取2次,提取率为90.82%.对牛蒡菊糖进行理化特性和组成分析,结果表明,该菊糖平均分子量和聚合度较低,纯度较高,单糖组成含有果糖及少量的葡萄糖,具有菊糖类物质的一般特征.  相似文献