庐山北麓JL红土剖面粉砂粒级元素地球化学特征及其物源意义     

黄颖  朱丽东  张晓  李凤全  贾佳  熊文婷  王天阳  叶玮 《第四纪研究》2019,39(5):1092-1102

加积型红土是中国南方第四纪环境变化研究的重要陆相载体,其沉积母质显示风成特性,后期经历较强的化学风化。为了明确加积型红土的物质来源,并减弱风化效应对其物源信息的影响,本文提取了庐山北麓JL红土剖面(厚18.46 m)部分样品的粉砂组分(4~63 μm),分析其元素地球化学特征,并通过元素比值及物源判别指数等方法讨论其蕴含的物源信息。结果显示:1)粉砂粒级化学组成中SiO2、Al2O3和Fe2O3三者的含量可达84.29%,K2O、Na2O、CaO和MgO四者含量仅1.30%,与全岩相比SiO2含量增高,Al2O3和Fe2O3含量明显降低,风化指数CIA值(74.02%)明显低于全岩样品(85.00%);微量元素中,粉砂粒级相对全岩Cu、Zn、Rb、Sr、Cr、La等含量降低,Y、Zr含量则略高。2)Na2O/Al2O3与K2O/Al2O3及Na2O/K2O与CIA的散点图中,粉砂粒级样点间的集聚程度明显降低,暗示风化效应在一定程度上被削弱。此外以洛川黄土和长江河漫滩沉积物为端元的物源指数计算表明,全岩样品消除粒级效应后的物源指数(PIw)与粉砂粒级物源指数(PIfs)吻合度较好,进一步验证了粉砂粒级地球化学特征在削弱风化效应方面的有效性。3)JL剖面上部黄棕色土的PIfs值为0.45,物源上更接近北方黄土,剖面中下部的网纹红土PIfs值为0.57,物源更接近长江沉积物。结合TiO2/Al2O3、Zr/Y、Hf/Ti等元素比值,JL剖面自下而上近源物质的贡献略有减少,远源物质的贡献则趋于增加,这可能意味着晚第四纪以来东亚冬季风不断增强的过程。  相似文献   

Ontogeny of the immune system in rock bream Oplegnathus fasciatus   总被引：1，自引：1，他引：0  

肖志忠  何滔  李军  高天翔 《中国海洋湖沼学报》2013,31(5):1028-1035

Histogenesis of the immune system and specific activity of superoxide dismutase(SOD) were studied in rock bream Oplegnathus fasciatus from fertilization to 50 days after hatching(DAH).The pronephric tubule primordium developed in the embryo,14 h 30 min post fertilization.The spleen anlage was observed between the swim bladder and the intestine at 5 DAH,and the thymus was formed as a paired structure under the pharyngeal epithelium above the gill arch at 10 DAH.The order of the immune organs becoming lymphoid was the pronephric kidney(10 DAH),thymus(15 DAH) and spleen(21 DAH).As the embryo developed,the specific activity of SOD gradually increased until hatching,but subsequently SOD activity continuously decreased to a minimum at 14 DAH.After the spleen became lymphoid,the specific activity of SOD was relatively stable.It is suggested that the immaturity of the lymphoid organs and low specific activity of SOD was the cause of the high mortality of fingerlings 12 to 16 DAH.  相似文献   

麦胚凝集素促进对虾免疫功能的初步研究   总被引：3，自引：0，他引：3  

许兵  纪伟尚  徐怀恕  石杰 《中国海洋大学学报(自然科学版)》1992,(4)

利用药浴法、注射法及药饵法研究了麦胚凝集素(WGA)促进对虾抗病力的效果。经肌肉注射法感染实验证明三种给药方法均可提高对虾的存活率,其中以药饵法(20mg/kg含量、喂养28d)效果较好,对虾存活率提高17％。表明利用药物促进对虾免疫系统功能,提高对虾抗病能力是一条可行的途径。  相似文献   

日本刺参的抗肿瘤及免疫调节作用研究   总被引：7，自引：1，他引：7  

王静凤  王奕  赵林  逄龙  薛长湖 《中国海洋大学学报(自然科学版)》2007,37(1):93-96,102

采用日本刺参（Apostichopus japonicus）浆灌胃移植性肿瘤模型小鼠，探讨了日本刺参的抗肿瘤作用及其对免疫功能的调节作用。结果表明，日本刺参各剂量组均能显著抑制小鼠S180肉瘤的生长，提高小鼠脾指数及胸腺指数（P〈0．05）；显著提高荷瘤小鼠血清溶血素含量（P〈0．01）和抗体形成细胞数（P〈0．05）；提高迟发型变态反应水平和脾淋巴细胞转化能力（P〈0．05，P〈0．01）；促进NK细胞活性和巨噬细胞的吞噬能力（P〈0．05。P〈0．01）。提示日本刺参能全面调节机体的特异性和非特异性免疫功能．控制和杀灭肿瘤细胞。  相似文献   

海藻多糖微量元素配合物的生物活性初步研究     

傅德贤  赵迪  郭澄联 《热带海洋学报》1995,(1)

用广东沿海盛产的半叶马尾藻Ｓａｒｇａｓｓｕｍｈｅｍｉｐｈｙｌｌｕｍ为原料提取多糖，与Ｆｅ（３＋），Ｚｎ（２＋）等微量元素进行反应，形成能溶于水的海藻多糖配合物。分别以剂量为３００ｍｇ·ｋｇ（－１）的海藻多糖配合物饲喂ＮＩＨ系小鼠７－１５ｄ。结果发现，该多糖配合物能提高小鼠的血红蛋白和红细胞数量。其中，以Ｆｅ（３＋）海藻多糖配合物效果最显著。观察各种免疫指标，发现海藻多糖和海藻多糖微量元素配合物都能提高小鼠的免疫指标。海藻多糖微量元素配合物的效果比海藻多糖好。结果提示，微量元素参与了机体的免疫活动，并提高了免疫活性。  相似文献   

Ontogeny of immune organs during early development stage of P.crocea     

XU Xiaojin  WENG Zhaohong  WANG Jun  SU Yongquan 《海洋学报(英文版)》2007,26(6):72-82

A histological and ultrastructural study was performed on the development of the head kidney, thymus, and spleen in Pseudosciaena crocea aging in range from just hatching to the 60th day after hatching (DAH). Head kidney was first present on the 3rd DAH. Primordial haemopoietic stem cells were first observed in the head kidney which rapidly differentiate into different cellular types. Progenitor spleen was present on the 4th DAH, located close to the gut, which soon became rich in blood capillaries, red blood cells and thrombocytes. The thymus was obvious on the 4th DAH, and was located on either side of the upper corner of the opercular cavity, closely under the membrance of the opercuhr cavity. The thymus was the last lymphoid organ to appear but showed a quick development. This organ seemed to originate from haemopoietic stem cells migrating from the head region of the kidney. The thymus consisted of outer thymocytic and inner epithelioid zones. There was no obvious demarcation between them, but both zones were visible. Small lymphocytes appeared, or lymphoid organs become lymphoid, in the sequence thymus, head kidney and spleen. Only a small number of lymphocytes appeared in the later stages. Non-specific systems may play an important role in the immunocompetence mechanisms of P. crocea during its early development stage.  相似文献   

溶藻弧菌脂多糖对大黄鱼的毒性与免疫保护性试验   总被引：10，自引：0，他引：10  

鄢庆枇  苏永全  王军  周永灿 《台湾海峡》2003,22(2):163-167

用酚水法从20dm3大黄鱼的病原菌--溶藻弧菌菌液分离出脂多糖(LPS)溶液380cm3,冻干后得到LPS粉末97.6mg.在注射剂量为0.2cm3不同浓度LPS溶液对大黄鱼肌肉注射毒性试验中,LPS注射浓度为0.5 mg/cm3 时, 5d内能引起大黄鱼死亡;当LPS浓度提高到2 mg/cm3时,大黄鱼的死亡率达到100%.以剂量为0.2 cm3、浓度为0.2 mg/cm3的LPS溶液对大黄鱼进行免疫注射,15d后用0.2cm3浓度为9×108 个/cm3的溶藻弧菌进行攻毒试验,40%的大黄鱼获得免疫保护.  相似文献   

河外射电源的核谱指数和延展谱指数(英文)     

张江水  林瑞光  樊军辉 《天文研究与技术》2003,(Z1)

我们采用 6cm和 2 0cm核流量密度和总流量密度的观测资料 ,分别计算出星系和类星体的核谱指数和延展谱指数 .此外 ,我们得到 :(1 )核谱指数和核主导系数相关 ;(2 )核主导系数同红移线性相关。  相似文献   

Studies on immunodiagnosis of hepatopancreatic parvo-like virus diseases ofPenaeus orientalis     

Sun Xiuqin  Wang Wenxin  Shao Jijun  Zhang Jinxin  Lu Ying  Xue Qinggang  Song Qinyun 《中国海洋湖沼学报》1993,11(3):245-248

This paper describes a rapid procedure for diagnosis of penaeid viral disease using the immune serological method. The SPA (Staphylococcal Protein A) coagglutination test in early diagnosis of penaeid viral disease has yielded satisfactory results. This is the first time SPA is used in China for diagnoses of viral diseases of marine invertebrates, especially penaeid shrimp. The SPA early diagnostic method is characterized by accuracy, rapidity, simplicity and convenience, low cost, high specificity, strong sensitivity and micro-detectability, and easy dissemination and adaptability in prawn farms.  相似文献   

STUDIES ON IMMUNODIAGNOSIS OF HEPATOPANCREATICPARVO-LIKE VIRUS DISEASES OF PENAEUS ORIENTALISII. RAPID EARLY DIAGNOSIS     

孙修勤  王文兴  邵济钧  张进兴  卢颖  薛清刚  宋庆云 《中国海洋湖沼学报》1993,(3)

This paper describes a rapid procedure for diagnosis of penaeid viral disease using the immune serological method. The SPA (Staphylococcal Protein A) coagglutination test in early diagnosis of penaeid viral disease has yielded satisfactory results.This is the first time SPA is used in China for diagnoses of viral diseases of marine invertebrates, especially penaeid shrimp.The SPA early diagnostic method is characterized by accuracy, rapidity, simplicity and convenience, low cost, high specificity, strong sensitivity and micro-detectability, and easy dissemination and adaptability in prawn farms.  相似文献