检索结果-南通市图书馆

Seasonal variability in dissolved oxygen in the Bohai Sea,China

Journal of Oceanology and Limnology 2022年第1期40卷 78-92页

作者： yaozu chen Fangguo ZHAI Yanzhen GU Jing CAO Cong LIU Xingchuan LIU Zizhou LIU Peiliang LI School of Marine Sciences Sun Yat-Sen UniversityZhuhai 519082China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China North China Sea Environmental Monitoring Center State Oceanic AdministrationQingdao 266000China Institute of Physical Oceanography and Remote Sensing Ocean CollegeZhejiang UniversityZhoushan 316021China Hainan Institute of Zhejiang University Sanya 572024China

Deoxygenation has frequently appeared in coastal ecosystems over the past century due to the joint infl uence of increasing anthropogenically induced nutrient inputs and global *** semi-enclosed Bohai Sea is a typical system that is prone to deoxygenation,with regular hypoxia events consistently recorded in recent *** on in-situ observation data collected in large-scale voyage surveys in the Bohai Sea during 2008-2017,the seasonal variability in dissolved oxygen(DO)and its controlling mechanisms were *** results indicated that in spring and autumn,the DO distributions exhibited similar spatial patterns in the surface and bottom layers,while in summer,its spatial distribution was characterized by large-scale oxygen-poor zones distributed off the Qinhuangdao Coast and the central southern Bohai Sea in the bottom *** controlling mechanisms of the DO distribution varied from season to *** and autumn DO distributions were dominated by the seawater *** the combined eff ects of stratifi cation and decomposition,the summer bottom DO exhibited dual-core *** the one hand,stratifi cation could greatly impede vertical mixing,resulting in reduced bottom DO *** the other hand,the increased bottom organic matter intensifi ed the decomposition processes,inducing massive DO consumption and elevated dissolved inorganic nitrogen *** addition,the stronger stratifi cation might be the reason for the more severe deoxygenation in the southern oxygen-poor zones in *** study provides guidance for an in-depth understanding of the DO seasonality in the Bohai Sea and the mechanisms that modulate it and for the improvement of hypoxia forecasts in ocean models.

关键词： dissolved oxygen seasonal variability mechanism the Bohai Sea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Climatology and seasonal variability of satellite-derived chlorophyll a around the Shandong Peninsula

引用

Journal of Oceanology and Limnology 2021年第4期39卷 1222-1244页

作者： Xiukai SONG Yanzhen GU Fangguo ZHAI Peiliang LI Pengxia LIU Zizhou LIU Wenfan WU yaozu chen Xiangyang JIANG Jianlong HE Shandong Marine Resources and Environment Research Institute Shandong Provincial Key Laboratory of Restoration for Marine EcologyYantai 264006China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Institute of Physical Oceanography and Remote Sensing Ocean CollegeZhejiang UniversityZhoushan 316021China Hainan Institute of Zhejiang University Sanya 572025China

The chlorophyll a(Chl a)is an important indicator of marine *** spatiotemporal variation of the Chl a greatly aff ects the mariculture and marine ranching in coastal waters of the Shandong *** the current study,the climatology and seasonal variability of surface Chl-a concentration around the Shandong Peninsula are investigated based on 16 years(December 2002-November 2018)of satellite *** results indicate that the annual mean Chl-a concentration is greater in the Bohai Sea than in the Yellow Sea and decreases from coastal waters to off shore *** highest Chl-a concentrations are found in Laizhou Bay(4.2-8.0 mg/m^(3)),Haizhou Bay(4.2-5.9 mg/m^(3))and the northeast coast of the Shandong Peninsula(4.4-5.0 mg/m^(3)),resulting from the combined eff ects of the intense riverine input and long residence time caused by the concave shape of the *** seasonal Chl-a concentration shows a significant spatial *** Chl-a concentrations in these three subregions generally exhibit an annual maximum in August/September,due to the combined eff ects of sea surface temperature,river discharge and sea surface *** the southeast coast region,however,the Chl-a concentration is lowest throughout the year and reaches a maximum in February with a minimum in July,forced by the seasonal evolution of the Yellow Sea Cold Water and monsoon *** interannual Chl-a concentration trends vary among regions and *** are significant increasing trends over a large area around Haizhou Bay from winter to summer,which are mainly caused by the rising sea surface temperature and *** other coastal areas,the Chl-a concentration shows decreasing trends,which are clearest in summer and induced by the weakening land *** study highlights the differences in the Chl-a dynamics among regions around the Shandong Peninsula and is helpful for further studies of coupled physical-ecological-human interactions at multiple scal

关键词： chlorophyll-a concentration Shandong Peninsula climatology seasonal variability Yellow Sea Cold Water

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Diterpenoids from Rabdosia Nervosa

引用

Chemical Research in Chinese Universities 1989年第3期5卷 250-254页

作者： Bai Guang, chen yaozu and Meng Xianjun (Department of Chemistry, Lanzhou University, Lanzhou)

Six ent-kaurene type diterpenoids were isolated from the leaves of Rabdosia nerwsa. Among ***-vosin A and B are new compounds, the structures of which were elucidated as 1 and 2 respectively by spectral and chemical methods. The other four were identified as odonicin (3), novelrabdosin (4), nodosin (5) and shikokianal acetate (8). Compounds (1), (2), (5) and (8) have not been found in this herb previously.

关键词： Rabdosia nervosa Diterpenoids Herb

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis of Chemical Incredients of Angelica Sinnesis——Analysis of Non-Volatile Constituents of Roots

引用

Chemical Journal of Chinese Universities 1985年第1期 59-67页

作者： chen yaozu and Zhang Huidi (Institute of Organic Chemistry,Lanzhou University,Lanzhou)

In the present investigation,the non-volatile constituents of Danguei (Tang-Kuei) roots of Gansu origin [Angelica sinensis (Oliv.) Diels] were analyzed and thirty seven organic constituin s were also identified,fifteen of which have not been recorded in literature before,including a new optically active compound named as Angelicide and an antibiotie,Brereldin *** plasma emission spectrometry,thirteen minor elements were also detecled

关键词： Analysis of Non-Volatile Constituents of Roots Analysis of Chemical Incredients of Angelica Sinnesis

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

SPIN-LABELED ANTITUMOR DERIVATIVES OF PODOPHYLLOTOXIN

引用

Science in China,Ser.B 1987年第10期30卷 1070-1079页

作者：陈耀祖张长久田暄 Department of Chemistry Lanzhou University

Three spin-labeled antitumor derivatives of podophyllotoxin, containing an iminoxyl radical,have been *** pharmacological tests showed that these derivatives have significant antitumor activity in several experimental tumor systems with a marked decrease in toxicity compared with the parent *** relative intensities of ESR signals of these spin-labeled compounds were linearly proportional to their concentrations, the levels of the agent in blood and organs of mice or rabbits can be measured via ESR spectrometry.

关键词： ESR OC GP

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

OFF－LINE　TWO－DIMENSIONAL　GAS　CHROMATOGRAPHY－MASS　SPECTROMETRY　FOR　ANALYSIS　OF　ASSENTAL　OIL　OF　MEDICINAL　HERB：USE　OF　ABSORPTION　TRAP　AS　INTERFACE

引用

Chinese Chemical Letters 1994年第1期5卷 73-76页

作者： XueYi MA Hui Ping PAN and yaozu chen (National Laboratory of Applied Organic Chemistry and Department of Chemistry,Lanzhou University, Lanzhou 730000)

The use of an absorption trap off-line 2-DGC in conjunction with a mass spectrometer greatly improved the separation and identification of minor constituents of a complex mixtures such as a natural essential oil. The ... 详细信息

关键词： GAS CHROMATOGRAPHY DIMENSIONAL TWO MASS LINE ABSORPTION

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

青海翠雀化学成份的研究

引用

有机化学 2003年第6期23卷 563-565页

作者：余明新潘远江陈耀祖浙江大学化学系杭州310027

用柱层析、制备薄层层析等对青海翠雀的化学成份进行了分离 ,并用IR ,EA ,MS ,1HNMR ,13 CNMR及DEPT等光谱确定了化合物的结构 ,共分得 5种二萜生物碱 ,其中一种为新化合物 ,还分得一种非生物碱 β 谷甾醇 .

关键词：二萜生物碱制备青海翠雀化学成份提取分离镇痛剂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

苯丙醇胺对映体的毛细管电泳分离和定量

引用

分析化学 2000年第2期28卷 197-200页

作者：王伟傅小芸陈耀祖兰州730000 兰州大学应用有机化学国家重点实验室浙江大学分析测试中心!杭州310027

采用环糊精及其衍生物作为手性选择剂对苯丙醇胺对映体进行了分离，研究了环糊精种类和浓度对分离的影响。结果表明，采用2，6-O-二甲基-β-环糊精（DM-β-CD）可以使苯丙醇胺对映体达到基线分离。在选定的条件下，考察了苯丙醇胺的定... 详细信息

采用环糊精及其衍生物作为手性选择剂对苯丙醇胺对映体进行了分离，研究了环糊精种类和浓度对分离的影响。结果表明，采用2，6-O-二甲基-β-环糊精（DM-β-CD）可以使苯丙醇胺对映体达到基线分离。在选定的条件下，考察了苯丙醇胺的定量线性范围、检测限和重现性，测得苯丙醇胺的线性范围为20～200mg/L，检测限为1mg／L，迁移时间重现性的RSD为1．0％，峰面积重视性的RSD小于3.5％，并对康泰克实样进行了分析。

关键词：毛细管电泳手性分离苯丙醇胺

来源：

同方期刊数据库评论