检索结果-南通市图书馆

In vitro iron enrichment experiments in the Prydz Bay, the Southern Ocean: A test of the iron hypothesis

Science China Earth Sciences 2009年第9期52卷 1426-1435页

作者： SUN Song PU XinMing zhang yongshan Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Marine Ecology Research Center First Institute of OceanographyState Oceanic AdministrationQingdao 266061China

In "high nitrate, low chlorophyll" (HNLC) ocean regions, iron has been typically regarded as the limiting factor for phytoplankton production. This "iron hypothesis" needs to be tested in various oceanic environments to understand the role of iron in marine biological and biogeochemical processes. In this paper, three in vitro iron enrichment experiments were performed in Prydz Bay and at the Polar Front north of the Ross Sea, to study the role of iron on phytoplankton production. At the Polar Front of Ross Sea, iron addition significantly (P0.05, Student's t-test) as a consequence of iron addition was observed. These results confirmed the limiting role of iron in the Ross Sea and indicated that iron was not the primary factor limiting phytoplankton growth in Prydz Bay. Because the light environment for phytoplankton was enhanced in experimental bottles, light was assumed to be responsible for the rapid growth of phytoplankton in all treatments and to be the limiting factor controlling field phytoplankton growth in Prydz Bay. During the incubation experiments, nutrient consumption ratios also changed with the physiological status and the growth phases of phytoplankton cells. When phytoplankton growth was stimulated by iron addition, N was the first and Si was the last nutrient which absorption enhanced. The Si/N and Si/P consumption ratios of phytoplankton in the stationary and decay phases were significantly higher than those of rapidly growing phytoplankton. These findings were helpful for studies of the ma- rine ecosystem and biogeochemistry in Prydz Bay, and were also valuable for biogeochemical studies of carbon and nutrients in various marine environments.

关键词： iron limitation iron hypothesis Southern Ocean Prydz Bay nutrient consumption ratio

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

Ontogenetic diet shift in Antarctic krill(Euphausia superba)in the Prydz Bay:a stable isotope analysis

引用

Acta Oceanologica Sinica 2017年第12期36卷 67-78页

作者： zhang Ye LI Chaolun YANG Guang WANG Yanqing TAO Zhencheng zhang yongshan WANG Aijun Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Third Institute of Oceanography State Oceanic AdministrationXiamen 361005China

As one of the most common and dominant species in the Southern Ocean, Antarctic krill（Euphausia superba）play a significant role in food web structure and the process of energy flow. The diet of Antarctic krill in the Prydz Bay during austral summer of 2012/2013 was investigated and the ontogenetic shift in krill diet was evaluated using the stable isotope method. The nitrogen stable isotope values（δ^（15） N） of adults（（2.78±0.58）‰） were much higher than those of juveniles（（1.69±0.70）‰）, whereas the carbon stable isotope values（δ^（13） C） of adults（–（28.26±1.08）‰） were slightly lower than those of juveniles（–（27.48±1.35）‰）. Particulate organic matter（POM）from 0, 25, and 50 m depth combined（0/25/50 m） represented phytoplankton food items. The results showed that phytoplankton food items in surface water and mesozooplankton were two essential food items for Antarctic krill in the Prydz Bay during summer. POM（0/25/50 m） contributes 56%–69% and 26%–34% to the diet of juvenile and adult krill, respectively, whereas mesozooplankton composes 13%–34% and 58%–71% of the diet of juvenile and adult krill, respectively. Thus, an ontogenetic diet shift from POM（0/25/50 m）, which consists mainly of phytoplankton, to a higher trophic level diet containing mesozooplankton, was detected. The capacity for adults to consume more zooplankton food items may minimize their food competition with juveniles, which rely mostly on phytoplankton food items. This suggests ＂diet shift with ontogeny＂ which may somehow help krill keep their dietary energy budget balanced and well adapted to the Antarctic marine ecosystem as a dominant species.

关键词： Antarctic krill Prydz Bay diet shift stable isotope Iso Source

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

GhAlaRP, a cotton alanine rich protein gene, involves in fiber elongation process

引用

The Crop Journal 2021年第2期9卷 313-324页

作者： Shouhong Zhu Yanjun Li Xinyu zhang Feng Liu Fei Xue yongshan zhang Zhaosheng Kong Qian-Hao Zhu Jie Sun College of Agriculture/The Key Laboratory of Oasis Eco-agriculture Shihezi UniversityShihezi 832000XinjiangChina State Key Laboratory of Cotton Biology Institute of Cotton ResearchAcademy of Agricultural SciencesAnyang 455000HenanChina State Key Laboratory of Plant Genomics Institute of Microbiology Academy of Seed DesignChinese Academy of SciencesBeijing 100101China CSIRO Agriculture and Food GPO Box 1700Canberra 2601Australia

Fiber length is one of the most important quality parameters of cotton *** analyses of developing cotton fibers have identified genes preferentially expressing in fiber elongation stage,but few have been functionally ***,on the basis of confirmation of the preferential expression profile of GhAlaRP(Gh_A09G1166 and Gh_D09G1172),an alanine rich protein gene,in the rapid elongating fibers,we investigated the role of GhAlaRP in fiber development by generating transgenic cottons with an increased or decreased expression level of *** results showed that the fiber length was consistently significantly shorter in both the GhAlaRP-RNAi lines and the alarp mutant generated by genome editing than in the control *** was localized on plasma membrane,nucleus and endoplasmic *** yeast two-hybrid assay and bimolecular fluorescence complementation assay showed that GhAlaRP co-expresses and interacts with GhAnnexin(Gh_D11G2184)and GhEXPA(Gh_A10G2323)that are involved in fiber ***-regulation of GhAlaRP co-suppressed the expression levels of GhAnnexin and *** results suggest a role of GhAlaRP in regulation of cotton fiber elongation,which could be achieved by regulating the functions of GhAnnexin and GhEXPA.

关键词： AlaRP Fiber elongation G.hirsutum Genome editing

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

The distribution and demography of Euphausia superba in Prydz Bay during the austral summer 2002

引用

Advances in Polar Science 2012年第1期23卷 12-18页

作者： LIU Yongqin SUN Song zhang yongshan LIU Huilian Key Laboratory of Marine Ecology and Environmental Science Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

This study documents the horizontal distribution and demography of Antarctic krill （Euphausia superba Dana）, col- lected using trawls, from the Prydz Bay region during January 2002. Euphausia superba （E. superba） was distributed primarily south of 64S. The average density and biomass were estimated as 68.85 ind.（1 000 m3） and 24.16 g wet weight-（1 000 m3）, re- spectively. Highest values were located in the open sea （depth 〉 3 000 m）. Body length ofE. superba ranged from 30 to 55 mm （N=1 758）, with a mean length of 38.45~3.68 mm （SD）. The overall sex ratio was approximately 1 ： 1, 47.6% females （41.9% sub-adults and 5.7% adults）, 46.6% males （42.7% sub-adults and 3.9% adults）, while 5.8% were juveniles. The population struc- ture of E. superba exhibited geographical variation. At stations in the western part of the survey area populations had a high pro- portion of juveniles, a lower sexual maturity stage for males and small body size, while the opposite was found at stations in the eastern part. A latitudinal difference was found at stations along 70.5°E and 73°E transects： body length was small and the sex ratio was high in regions of high latitude, while the opposite occurred in areas of low latitude.

关键词： Euphausia superba distribution density population structure Prydz Bay

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

四边任意支承条件下弹性矩形薄板弯曲问题的解析解

引用

应用力学学报 2005年第2期22卷 293-297,i013页

作者：钟阳张永山大连理工大学

利用辛几何法推导出了四边为任意支承条件下矩形薄板弯曲的解析解。在分析过程中首先把矩形薄板弯曲问题表示成Hamilton正则方程,然后利用辛几何方法对全状态相变量进行分离变量,求出其本征值后,再按本征函数展开的方法求出四边为任意... 详细信息

利用辛几何法推导出了四边为任意支承条件下矩形薄板弯曲的解析解。在分析过程中首先把矩形薄板弯曲问题表示成Hamilton正则方程,然后利用辛几何方法对全状态相变量进行分离变量,求出其本征值后,再按本征函数展开的方法求出四边为任意支承条件下矩形薄板弯曲的解析解。由于在求解过程中并不需要人为的事先选取挠度函数,而是从弹性矩形薄板弯曲的基本方程出发,直接利用数学的方法求出问题的解析解,使得这类问题的求解更加理论化和合理化。文中的最后还给出了计算实例来验证本文方法的正确性。

关键词：弹性薄板四边任意支承辛几何法 Hamilton正则方程

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

A genome-wide analysis of SWEET gene family in cotton and their expressions under different stresses

引用

Journal of Cotton Research 2018年第2期1卷 12-26页

作者： ZHAO Lanjie YAO Jinbo CHEN Wei LI Yan L Youjun GUO Yan WANG Junyi YUAN Li LIU Ziyang zhang yongshan State Key Laboratory of Cotton Biology Institute of Cotton Research of Chinese Academy of Agricultural Sciences Anyang Institute of Technology University of Saskatchewan

Background： The SWEET （Sugars will eventually be exported transporters） gene family plays multiple roles in plant physiological activities and development process. It participates in reproductive development and in the process of sugar transport and absorption, plant senescence and stress responses and plant-pathogen interaction. However, thecomprehensive analysis of SWEET genes has not been reported in cotton. Results： In this study, we identified 22, 31, 55 and 60 SWEETgenes from the sequenced genomes of Gossypium orboreum, G. rairnondii, G. hirsutum and G. borbadense, respectively. Phylogenetic tree analysis showed that the SWEET genes could be divided into four groups, which were further classified into 14 sub-clades. Further analysis of chromosomal location, synteny analysis and gene duplication suggested that the orthologs showed a good collinearity and segmental duplication events played a crucial role in the expansion of the family in cotton. Specific MtN3_slv domains were highly conserved between Arabidopsis and cotton by exon-intron organization and motif analysis. In addition, the expression pattern in different tissues indicated that the duplicated genes in cotton might have acquired new functions as a result of sub-functionalization or neo-functionalization. The expression pattern of SWEET genes showed that the different genes were induced by diverse stresses. The identification and functional analysis of SWEET genes in cotton may provide more candidate genes for genetic modification. Conclusion： SWEET genes were classified into four clades in cotton. The expression patterns suggested that the duplicated genes might have experienced a functional divergence. This work provides insights into the evolution of SWEETgenes and more candidates for specific genetic modification, which will be useful in future research.

关键词： Gossypium Sugars will eventually be exported transporters (SWEETs) Gene expression patterns Stress

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

DNA barcoding of Antarctic marine zooplankton for species identification and recognition

引用

Advances in Polar Science 2013年第2期24卷 119-127页

作者： CHENG Fangping WANG Minxiao SUN Song LI Chaolun zhang yongshan Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences

Polar zooplankton are particularly sensitive to climate change, and have been used as rapid-responders to indicate climate-induced changes in the fragile Antarctic ecosystem. DNA barcoding provides an alternative approach for rapid zooplankton species identification. Ninety-four specimens belonging to 32 Antarctic zooplankton species were barcoded to construct a compre- hensive reference library. An 830 to 1 050 base-pair region of the mitochondrial cytochrome c oxidase subunit I （mtCOI） gene was obtained as DNA barcodes. The intraspecific variation of the gene ranged from 0 to 2.6% （p-distance）, with an average of 0.67% （SD=0.67%）. The distance between species within the same genera ranged from 0.1% （Calanus） to 29.3%, with an average of 15.3% （SD=8.4%）. The morphological and genetic similarities between Calanus propinquus and C. simillimus raise new questions about the taxonomic status of C. simillimus. With the exception of the two Calanus species, the intraspecific genetic divergence was much smaller than the interspecific divergence among congeneric species, confirming the existence of a barcode gap for Ant- arctic zooplankton. In addition, species other than Calanus sp. formed a monophyletic group. Therefore, we have confirmed DNA barcoding as an accurate and efficient approach for zooplankton identification in the Antarctic area （except for Hydromedusa, Tu- nicata, and other gelatinous zooplankton）. Indicator vector analysis further confirmed this conclusion. The new primer sets issued here may facilitate the study of Antarctic marine zooplankton species composition by environmental metagenetic analysis.

关键词： Southern Ocean DNA barcode Calanus zooplankton high-throughput analysis

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

弹性地基上矩形薄板问题的Hamilton正则方程及解析解

引用

固体力学学报 2005年第3期26卷 325-328页

作者：钟阳张永山大连理工大学土木学院大连116024 广州大学土木学院广州510405

利用辛算法求出弹性地基上矩形薄板问题的解析解,将弹性地基视为双参数弹性地基,直接从弹性矩形薄板的控制方程推导出了问题的Ham ilton正则方程,为求出任意边界条件下问题的理论解奠定了基础,并且通过算例验证了文中所采用方法的正确性.

关键词：弹性薄板弹性地基 Hamilton正则方程辛算法解析解双参数弹性地基弹性矩形薄板板问题任意边界条件方程推导

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

考虑多块混凝土板拼装的组合钢板剪力墙抗震性能试验研究

引用

振动与冲击 2018年第18期37卷 193-200页

作者：韩启浩汪大洋张永山广州大学土木工程学院广州510006

传统组合钢板剪力墙采用单块混凝土板拼装,其尺寸较大,运输吊装困难,考虑将单块改为多块预制混凝土板,进而提出了多块混凝土板拼装的组合钢板剪力墙。设计制作了竖向拼装组合钢板剪力墙、横向拼装组合钢板剪力墙及传统组合钢板剪力墙共... 详细信息

传统组合钢板剪力墙采用单块混凝土板拼装,其尺寸较大,运输吊装困难,考虑将单块改为多块预制混凝土板,进而提出了多块混凝土板拼装的组合钢板剪力墙。设计制作了竖向拼装组合钢板剪力墙、横向拼装组合钢板剪力墙及传统组合钢板剪力墙共3个缩尺比为1/3的组合钢板剪力墙试件,开展了低周反复荷载试验,对比研究了各试件的破坏特征、滞回性能、位移延性、耗能能力及刚度退化等抗震性能。结果表明:混凝土板分块布置会一定程度地降低组合钢板剪力墙的抗侧刚度和耗能能力,但可以减少内藏钢板对边缘框架柱产生附加弯矩的不利影响;竖向拼装组合钢板剪力墙呈弯剪破坏形式,属于延性破坏,横向拼装组合钢板剪力墙在预制板间横向拼缝处撕裂破坏,呈现较为明显的剪切型破坏特征;横向和竖向两种拼装方式中,竖向拼装组合钢板剪力墙延性系数略小,但其他抗震性能指标如耗能能力、承载能力、刚度等均更为优越。

关键词：组合钢板剪力墙多块混凝土板拼装方式拟静力试验破坏特征抗震性能

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

改进阈值的窗口傅里叶变换滤波

引用

激光与光电子学进展 2015年第3期52卷 165-170页

作者：蔡长青张永山广州大学土木工程学院广东广州510006

固定阈值算法对由噪声引起的小的频谱系数进行归零,可以取得较好的去噪效果。但由于其阈值函数不连续,在阈值附近具有突变,所以会对一些大的噪声频谱系数有所保留,对小的信息频谱系数造成丢失。为了改善窗口傅里叶变换滤波算法中的阈值... 详细信息

固定阈值算法对由噪声引起的小的频谱系数进行归零,可以取得较好的去噪效果。但由于其阈值函数不连续,在阈值附近具有突变,所以会对一些大的噪声频谱系数有所保留,对小的信息频谱系数造成丢失。为了改善窗口傅里叶变换滤波算法中的阈值选取方法,提出了自适应阈值方法。通过模拟散斑干涉相位图验证可知,所提出的自适应阈值方法可以对噪声进行有效的滤除,同时对信号信息进行很好的保留。

关键词：测量散斑干涉窗口傅里叶变换滤波固定阈值自适应阈值

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：