Laboratory Investigation into the Evaporation of Natural-Gas Condensate Oils: Hints for the Sanchi Oil Spill     

Yong Zhang  Tao Yang  Junbo Zhang  Baoyi Lv  Xiangsheng Cheng  Yin Fang 《中国海洋大学学报(英文版)》2020,19(3):633-642

The Sanchi oil tanker collision in the East China Sea on January 6th, 2018 has caused worldwide attention due to its uniqueness. A considerable amount of h  相似文献   

利用牙鲆鳃细胞系分离和培养淋巴囊肿病毒   总被引：1，自引：4，他引：1  

吕宏旭  汪岷  李红岩  郭华荣  张士璀  包振民  周丽 《中国海洋大学学报(自然科学版)》2003,33(2):233-239

本文利用牙鲆鳃细胞系进行了养殖牙鲆淋巴囊肿病毒的分离及培养 ,并通过电镜对培养细胞中淋巴囊肿病毒的形态及感染循环进行了初步研究。将病鱼的淋巴囊肿组织无菌滤液接种牙鲆细胞系 ,细胞出现了明显的细胞病变 ( Cytopathic effect,CPE)。电镜观察在培养细胞的胞质中有病毒的包涵体 ,胞质中散在 6角形、5角形或圆形的病毒粒子 ,大小为 10 0～ 140 nm之间。在感染细胞的线粒体中也存在大量的病毒颗粒。  相似文献   

几丁糖酯原料药稳定性研究     

吕志华  赵峡  徐家敏 《中国海洋大学学报(自然科学版)》2001,31(6):842-848

该文建立高效凝胶渗透色谱法 (HPGPC) ,明胶比浊法 ,氧瓶燃烧法三种分析方法考察海洋硫酸多糖药物几丁糖酯的稳定性 ,采用这三种方法分别考察几丁糖酯原料药在高温、高湿、强光照射及加速条件下分子量及分布宽度、样品中硫酸根含量及样品含量的变化情况。结果表明 :三种方法均适用于几丁糖酯的稳定性考察 ,几丁糖酯在上述影响因素条件下稳定性良好  相似文献   

大鹏湾夜光藻种群的季节变化和分布特征     

黄长江  齐雨藻  杞桑  吕颂辉  江天久 《海洋与湖沼》1996,27(5):493-498

于１９９０年３月－１９９２年６月对中国南海大鹏湾盐田附近海域的夜光藻种群动态及时空分布进行了综合调查，结果表明，夜光藻种群的出现期间一般为每年的１－６月，最早是１９９１年的１２月，娄量高峰期为３－５月，种群密度的波动极为显著；调查期间共发生８次赤潮，且都发生在３月初至５月初；大鹏湾夜光藻赤潮的发生特点是，赤潮的发生和消失突然，持续时间短，一般不超过３ｄ。  相似文献   

温度、盐度、光照强度和pH对海洋原甲藻增长的效应   总被引：23，自引：2，他引：23  

王正方  张庆  吕海燕 《海洋与湖沼》2001,32(1):15-18

采用微量移液稀释法对海洋原甲藻进行无菌培养，以研究温度、盐度、光照强度和pH对海洋原甲藻增长的效应。结果表明，海洋原甲藻最大增殖速率发生在温度为(25±1)℃、盐度为31、光照强度为3000lx、pH为8.0的环境条件下。海洋原甲藻在温度18—28℃、盐度为25—34、光照强度为1000—6500lx、pH为7.5—8.3范围内适宜生长。这一结果与观测到的海洋原甲藻赤潮发生时环境条件相近，其中温度的效应最为明显。  相似文献   

Climate change impacts on regional rice production in China   总被引：1，自引：0，他引：1  

Zunfu Lv  Yan Zhu  Xiaojun Liu  Hongbao Ye  Yongchao Tian  Feifei Li 《Climatic change》2018,147(3-4):523-537

Rice (Oryza sativa L.) production is an important contributor to China’s food security. Climate change, and its impact on rice production, presents challenges in meeting China’s future rice production requirements. In this study, we conducted a comprehensive analysis of how rice yield responds to climate change under different scenarios and assessed the associated simulation uncertainties of various regional-scale climate models. Simulation was performed based on a regional calibrated crop model (CERES-Rice) and spatially matched climatic (from 17 global climate models), soil, management, and cultivar parameters. Grain-filling periods for early rice were shortened by 2–7 days in three time slices (2030s, 2050s, and 2070s), whereas grain-filling periods for late rice were shortened by 10–19 days in three time slices. Most of the negative effects of climate change were predicted to affect single-crop rice in central China. Average yields of single-crop rice treated with CO₂ fertiliser in central China were predicted to be reduced by 10, 11, and 11% during the 2030s, 2050s, and 2070s, respectively, compared to the 2000s, if planting dates remained unchanged. If planting dates were optimised, single-crop rice yields were predicted to increase by 3, 7, and 11% during the 2030s, 2050s, and 2070s, respectively. In response to climate changes, early and single-crop rice should be planted earlier, and late rice planting should be delayed. The predicted net effect would be to prolong the grain-filling period and optimise rice yield.  相似文献   

1975-2015年鄂尔多斯市沙漠化的时空演变过程     

冯坤  颜长珍  谢家丽  钱大文 《中国沙漠》2018,38(2):233-242

鄂尔多斯市地处温带草原向荒漠草原过渡的半干旱区,是中国沙漠化问题较为严重的区域之一,其土地沙漠化发展和逆转过程及影响因素在北方农牧交错带具有代表性。以7期Landsat卫星遥感数据为信息源提取沙漠化土地类型及程度的时空格局信息,分析了该地区自1975年以来的土地沙漠化过程,并结合气象及社会经济数据采用主成分分析法对驱动因子进行定量分析。结果表明：在脆弱生态环境背景下,鄂尔多斯市土地沙漠化受人口数量增加、过垦及过牧等人为因素的严重影响。不同时段土地沙漠化发展的方向与驱动力都有所不同,1975-2000年是土地沙漠化的急剧发展期,驱动力以人为因素为主导,自然因素为基础;2000-2015年是土地沙漠化的逆转期,驱动力以自然因素为主,人为因素为辅。  相似文献   

Assessing the Impact of the Sloping Land Conversion Program on Rural Household Income in the Upper Reaches of Minjiang River,China     

HUANG Jiali  ZHAO Hui  LIU Yunwei  YANG Jianying 《资源与生态学报(英文版)》2018,9(5):516-525

One secondary target of the SLCP is poverty reduction. Therefore, the impact of the SLCP on household income is a subject of much research. This study was conducted to determine whether the SLCP has affected incomes of households at different income levels13 years after its implementation. Using survey data from 2012 on rural households’ livelihoods in the upper reaches of the Minjiang River in Sichuan Province and using the non-participating households as a reference, the current impact of the SLCP on household income is calculated with a multiple linear regression model and a quantile regression model. The socio-geographic features of participating and non-participating households are also be compared. The results show no significant differences between the SLCP participating and non-participating households in many socio-demographic characteristics. Participating in the SLCP had no significant impact on household income at all income levels in the study area in 2012. This finding suggests that the SLCP is not currently increasing household income significantly in the study area, and that the implementation plan of the SLCP should be changed in this area in order to achieve its poverty reduction goal.  相似文献   

分光光度法测定海洋河弧菌510脂多糖     

张运涛  顾谦群  方玉春  吕元萌  管华诗 《中国海洋大学学报(自然科学版)》2003,33(3):355-360

本文研究了直接测定海洋河弧菌 (vibrio fluvailis) 5 10脂多糖的分光光度法。利用 1,9-二甲基亚甲蓝 (DMB) ,在适当条件下同脂多糖发生染色反应 ,在 5 5 0 nm波长下 ,反应体系的吸光值同脂多糖含量呈线性相关。相关系数为 0 .9993,最低检出限为 10 μg/m L,相对标准偏差为 1.6 2 ,平均回收率为 (10 5± 2 .18) %。  相似文献   

“916”低聚糖抗卵磷脂氧化活性的研究     

吕志华  于广利  梁勇  徐家敏 《中国海洋大学学报(自然科学版)》2001,31(1):53

作者采用自由基引发氧化模型。通过测定卵磷脂氢过氧化物 ( PCOOH) ,研究了“916”低聚糖对卵磷脂 ( PC)氧化的抑制作用。实验结果表明 :( 1)“916”低聚糖具有良好的抗氧化活性 ;( 2 )各低聚糖在质量相同和含硫量大致相同的条件下 ,总体上分子量越小抗氧化活性越高。  相似文献