Depth profiles of lithogenic and anthropogenic mercury in the sediments from Thane Creek,Mumbai, India     

SKSAHU  RCBHANGARE  M TIWARI  PYAJMAL  GGPANDIT 《国际泥沙研究》2014,29(3):431-439

Mercury（Hg） is well known as one of the most toxic elements to man.The coastal environments adjacent to industrial areas are reported to often be contaminated with mercury.Mercury becomes more toxic in the form of methylmercury（Me-Hg） which is converted from inorganic mercury in aqueous systems by microbial activity and can bio-magnify through the food chain.A simple method for the determination of total mercury and methylmercury in sediments was optimized by slightly modifying an old method using the direct mercury analyzer technique.Core sediment samples from Thane Creek,Mumbai,India were collected and analysed for total mercury and methylmercury.The Hg concentration in the creek varied between 0.54 to 16.03 μg g~（-1） while Me-Hg concentrations ranged between0.04 to 1.07 μg g~（-1）.In surface sediment,mercury concentrations ranged from 4.33 μg g~（-1） to 12.16μg g~（-1）.Total organic carbon content was found to be around 2 percent in different layers of the sediments.The enrichment factors,which indicate the extent of pollution in sediments,were estimated to range from 26 to 50 at different locations in the creek.Lithogenic and anthropogenic concentrations of mercury in the creek were also determined to compare the impact of anthropogenic and natural sources.Anthropogenic inventories were about 5-70 times more in concentration than the lithogenic in the different core sediments.  相似文献   

Rheological and Structural Properties of Sea Cucumber Stichopus japonicus During Heat Treatment   总被引：6，自引：0，他引：6  

GAO Xin XUE Dongmei ZHANG Zhaohui XU Jiachao XUE Changhu 《中国海洋大学学报(英文版)》2005,4(3):244-247

Changes in tissue structure, rheological properties and water content of raw and heated sea cucumber meat were studied. Sea cucumber Stichopus japonicus was heated at 25℃, 70℃ and 100℃ water for 5 min. The structural changes were observed using a light microscope and the rheological parameters （rupture strength, adhesive strength and deformation） determined using a texture meter. Microscopic photograph revealed that the structural change of heated meat was greater than that of raw meat. The rupture strength, adhesive strength and deformation of raw meat were smaller than those of the heated meat. Meanwhile, rheological parameters showed positive correlation with heating temperature. These changes are mainly caused by thermal denaturation and gelatinization of collagen during heating. These changes were also evidenced in observations using a light microscope and differential scanning calorimetry.  相似文献   

浅水湖泊沉积物脱氢酶活性的测定及其生态学意义   总被引：1，自引：0，他引：1  

黄代中  肖文娟  刘云兵  刘竟远  周易勇 《湖泊科学》2009,21(3):345-350

以武汉市浅水湖泊(月湖)为实验对象确定了沉积物脱氢酶活性(DHA)测定的最佳条件:以经甲醛灭菌的沉积物为对照,以氯化三苯基四氮唑为电子受体(0.4%),沉积物用量为0.5g,pH值为7.5,培养时间为3h.据上二述条件测定的DHA比未优化条件下的相应值高3-5倍,且表现出与沉积物有机质含量更为显著的正相关关系.武汉东湖3个子湖共23个采样点沉积物样品的测试结果进一步证实了上述方法的可行性,同时初步揭示了湖泊沉积物脱氢酶反映微生物活性与有机质状态的生态学意义.  相似文献   

海洋生物活性肽的功能、制备技术与作用机制研究进展     

杨贵兰  秦松  李文军  李亚 《海洋科学》2021,45(10):123-132

许多海洋生物活性肽具有降血压、抗炎、抗氧化、抗血栓等多种生物活性,在功能食品及医药领域有着广阔的应用前景。本文主要综述了海洋生物活性肽的制备方法、功能活性及其作用机制,为进一步开发和利用海洋生物活性肽提供参考。  相似文献   

新书架     

《气象》2008,34(6):128

《城市大气可吸入颗粒物物理化学特征及生物活性研究》;《卫星气象学》;《世界气候与农业》;《现代天气预报技术和方法》。  相似文献   

大黄鱼（Pseudosciaena crocea）一种新型抗菌肽的纯化及其生物学特性研究          下载免费PDF全文

纪勇  王晓露  苏永全  覃映雪  邹文政  邢颜丽  徐晓津  鄢庆枇 《海洋与湖沼》2011,42(3):448-454

以致病性溶藻弧菌为指示菌,通过酸粗提、固相萃取、Sephadex G-25柱凝胶层析和RP—HPLC等分离纯化技术,从大黄鱼胃肠组织中分离纯化抗菌肽。结果表明,大黄鱼肠道组织中存在着多种抗菌物质,并最终得到一种高纯度的新型抗菌肽AMP-W3。AMP—W3由10种氨基酸组成,其中天冬氨酸、谷氨酸和甘氨酸的含量较高。AMP...  相似文献   

苯并异噻唑啉酮类衍生物的制备与生物活性测试          下载免费PDF全文

许凤玲  蔺存国  刘秀丽  徐伟 《海洋科学》2011,35(4):67-69

以1,2-苯并异噻唑-2(3H)-酮为原料合成了3-羰基苯并异噻唑-2(3H)-苯甲酸甲酯衍生物,目标化合物的结构经元素分析、<'1>H NMR和质谱确证.化合物对大肠杆菌、金黄色葡萄球菌、溶藻弧菌、嗜水气单胞菌、枯草芽孢杆菌5种海洋菌的抑菌活性结果表明,化合物对上述菌种均有不同程度的抑制作用,其中对大肠杆菌活性最高,...  相似文献   

Studies on the bioactivity of marine microorganisms using Pyricularia oryzae model     

WEN Zhanbo  PEI Yuehu  TIAN Li  GAO Aiguo  HONG Xuguang  LI Xianchun 《海洋学报(英文版)》2006,25(6):153-161

1Introduction The marine environment contains a complex va-riety of plants, animals and microorganisms. Owingto their unique adaptations to the habitat, these liv-ing creatures elaborate a wide diversity of naturalproducts with specific bioactivities, whi…  相似文献   

Antioxidant enzyme activities in different genders and tissues of amphioxus Branchiostoma belcheri tsingtauense     

魏然  张士璀  王长法  庞秋香 《中国海洋湖沼学报》2007,25(1):73-77

Information regarding antioxidant enzymes in amphioxus remains lacking, and this study was carried out to examine the activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX) in different genders and tissues of amphioxus Branchiostoma belcheri tsingtauense. Results show that (1) CuZn-SOD, CAT and GPX activities in the whole amphioxus B. belcheri tsing- tauense were basically at the same levels in male and female amphioxus, whereas both T-SOD and Mn-SOD activities in male amphioxus were significantly higher than that in the female (P<0.05); (2) The testis had significantly higher T-SOD and CuZn-SOD activities than the ovary (P<0.05); (3) CuZn-SOD activity was undetectable in the guts of male and female amphioxus; (4) For both male and female am- phioxus, the activities of CAT and GPX in the gonads including testis and ovary were the lowest (P<0.05) among the tissues examined; (5) The gut and gill had the same level GPX activities while the gut had a higher CAT activity; (6) There was no clear difference in CAT and GPX activities in the corresponding tissues between male and female amphioxus. The study on SOD, CAT and GPX activities in different genders and tissues of the protochordate provides data for future comparison of amphioxus antioxidant enzymes with those of invertebrates and vertebrates.  相似文献   

矿物纤维粉尘的表面特性对比研究     

董发勤  万朴  彭同江  冯启明  宋功宝  李国武 《矿物岩石地球化学通报》1997,(Z1)

矿物纤维粉尘的表面特性对比研究＊董发勤万朴彭同江冯启明宋功宝李国武＊＊（西南工学院矿物材料及应用研究所，四川绵阳６２１００２）＊国家自然科学基金资助项目（４９５０２０２５）部分成果＊＊参加工作的还有李平等关键词矿物纤维粉尘表面特征生物活性粒径小于７５...  相似文献