前苏联七十年海冰研究回顾     

曲维政  李若钝 《海洋预报》1993,10(3):31-42

本文简要介绍了前苏联近七十年来海冰研究的主要成果及其采用的一些预报方法。  相似文献   

Identification of Epinephelus malabaricus and Epinephelus coioides using DNA markers     

WANG Shifeng  DU Jiaying  WANG Jun  DING Shaoxiong 《海洋学报(英文版)》2007,26(1):122-129

1 IntroductionBothEpinephelus malabaricusandE. coioidesbelong to the genusEpinephelus(Perciformes: Ser-ranidae: Epinephelinae).They are warm water reeffishes that have similar distribution ranges as well assimilar morphological characteristics, which have…  相似文献   

中华鲟配合饲料适宜蛋白质含量及最佳蛋白能量比研究   总被引：10，自引：0，他引：10       下载免费PDF全文

温小波  库夭梅  罗静波 《海洋科学》2003,27(4):38-43

以酪蛋白和明胶为蛋白源 ,添加豆油、鱼油、糊精、纤维素以及适量的维生素和矿物质混合剂配制试验饲料 ,饲料配成5个蛋白质水平 ,每个蛋白水平分别包括5个能量级 ,以体质量增长倍数、蛋白质效率和饲料系数为评判依据 ,对体质量为8.73g±0.79g的中华鲟(Acipensersinensis)的适宜蛋白质含量及其蛋白能量比进行了研究。经过为期8周的试验 ,结果表明 :中华鲟幼鲟配合饲料中的适宜蛋白质含量范围为35.7%～41.8% ,饲料的最佳蛋白能量比范围为21.85～30.05ng/J。当试验饲料蛋白质含量为40.3% ,蛋白能量比为27.85ng/J时 ,试验鲟鱼获得最大体质量增长倍数为11.60±1.20,最低的饲料系数为1.68±0.23,以及最高的蛋白质效率为1.58%±0.14%。  相似文献   

6-磷酸山梨醇脱氢酶(gutD)基因克隆、测序和表达     

陈启伟  刘广发  邱凤英 《台湾海峡》2004,23(3):314-317

本研究根据6-磷酸山梨醇脱氢酶基因(gutD)两端序列设计引物，以假单胞杆菌(Pseudonmonas XM)的总DNA为模板通过PCR的方法克隆gutD基因并进行序列分析，将克隆得到的gutD基因与原核表达载体pBV220连接并转化大肠杆菌(Escherichia coli)JM101后检测其蛋白表达及菌株生长耐盐性。  相似文献   

潮汐对瞬态气候响应模拟的影响研究     

于溢  刘海龙  林鹏飞  兰健 《海洋学报(英文版)》2020,39(1):52-62

In this study, the impact of oceanic processes on the sensitivity of transient climate change is investigated using two sets of coupled experiments with and without tidal forcing, which are termed Exp_Tide and Exp_Control,respectively. After introducing tidal forcing, the transient climate response(TCR) decreases from 2.32 K to 1.90 K,and the surface air temperature warming at high latitudes decreases by 29%. Large ocean heat uptake efficiency and heat storage can explain the low TCR in Exp_Tide. Approximately 21% more heat is stored in the ocean in Exp_Tide(1.10×10~(24) J) than in Exp_Control(0.91×10~(24) J). Most of the large ocean warming occurs in the upper 1 000 m between 60°S and 60°N, primarily in the Atlantic and Southern Oceans. This ocean warming is closely related to the Atlantic Meridional Overturning Circulation(AMOC). The initial transport at mid-and high latitudes and the decline in the AMOC observed in Exp_Tide are both larger than those observed in Exp_Control. The spatial structures of AMOC are also different with and without tidal forcing in present experiments. The AMOC in Exp_Tide has a large northward extension. We also investigated the relationship between AMOC and TCR suggested by previous studies using the present experiments.  相似文献   

N,N''''-双癸酰基乙二胺二乙酸钠的合成与性能研究     

毕彩丰  马少华  薛尧森  言亮亮 《中国海洋大学学报(自然科学版)》2006,36(3):473-476

以乙二胺和氯乙酸为原料,在低温常压下合成乙二胺二乙酸(EDDA),再以EDDA与癸酰氯反应制得N,N'-双癸酰基乙二胺二乙酸钠.采用核磁共振波谱确证了其结构;对产品的临界表面张力、起泡及稳泡能力、乳化能力及润湿渗透性能进行表征.在25℃时,N,N'-双癸酰基乙二胺二乙酸钠溶液的临界表面张力为28.1mN/m,临界胶束浓度为1.6×10-3 mol/L.显示出该产品有优良的起泡稳泡性能、乳化性能及润湿渗透性能,是1种优良的表面活性剂.  相似文献   

锆石鉴定方法     

邹志强 《海洋地质》1997,(2):93-94

本文着重在充分掌握锆石形态特征、物理性质和光学特性基础上，通过体视放在和偏光镜对它进行鉴定，与此同时，还简单介绍了微化分析等其它几种鉴定方法。  相似文献   

Elemental geochemical records of seafloor hydrothermal activities in the sediments from the Okinawa Trough     

ZHAI Shikui  YU Zenghui  DU Tongjun 《海洋学报(英文版)》2007,26(4):53-62

The major and minor element contents in the sediment core H9 from the hydrothermal fields of the Okinawa Trough show a sharp change at the depth of 80 cm. The elements enriched in the upper 80 cm core are those enriched in the hydrothermal deposits and in the surface sediments recovered from the hydrothermal fields in the trough, which indicates the input of hydrothermal materials. Comparing with other hydrothermal sediments from Mid-ocean Ridges or the Lau Basin, the degree of the enrichment of elements iron, copper,cobalt, and nickel is relatively low. However, the enrichment of elements manganese, lead, arsenic, antimony and mercury is remarkable. The average contents of these elements in the upper 80 cm core sediments are three to six times those in the lower section, and 3~12 times those in the surface sediments which are not influenced by hydrothermal activities. Hydrothermal activities have contributed significant manganese, lead, arsenic, antimony and mercury to the sediments, and these elements are distinct indicators for the hydrothermal activity in the Okinawa Trough. The significant enrichment of these elements in Core H9 upward from the depth 80 cm indicates the start or the significant enhancing of the hydrothermal activity in this area at about 5 740 aB.P. The average accumulation rate of manganese during this period is about 40 461 μg/(cm2·ka), which is similar to the hydrothermal sediments in the Lau Basin or the East Pacific Rise.  相似文献   

南极生物热耐受性:热极限的进化和适应性调节     

石红旗 《海洋科学进展》2005,23(Z1):86-89

温室效应和全球气候变化已经影响到南、北极地区,极地气温升高对于极地生物链的基础部分产生巨大影响.南极生物链中的关键初级生产力是微藻,南极冰藻是极好的生态指示种.南极冰藻在高于生长适宜温度下生长受到抑制,抵抗高温胁迫的机制和能力制约着南极冰藻的生存,南极冰藻生存威胁到极地生态的生物多样性和极地生物链的完整性.持续低温环境进化过程对极端适冷微藻热适应机理的影响是理解极地气候变化对南极冰藻生态影响的依据.  相似文献   

小球藻紫外线诱变及高产藻株筛选   总被引：1，自引：0，他引：1  

张学成  时艳侠  孟振 《中国海洋大学学报(自然科学版)》2007,37(5):749-753

利用单细胞分离技术和紫外诱变育种技术,筛选高产小球藻株。通过单细胞分离技术获得的藻株Chlorella vul-garisQ7,生长速度和蛋白含量均优于其它藻株。以C.vulgarisQ7为出发株,进行紫外诱变,从120株诱变单克隆中筛选出3个株系:M51,M59,M73。与出发株相比,突变株M51,M59,M73的生长速率分别提高了6.23%,3.8%,5.92%。蛋白含量分别提高了2.5%,3.1%,1.9%。研究了诱变株的最适生长条件,结果表明在140μmol.m-2.s-1,25℃时,诱变株具有最大的生长速率和生物量。探讨了诱变株的遗传稳定性,结果表明诱变株可稳定遗传。  相似文献