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Toxic marine diatoms of Hong Kong:A paleoecological study

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Journal of Environmental Sciences 1997年第1期9卷 1-10页

作者： Mike Dickman Tom Glenwright Ecology and Biodiversity Department,The University of Hong Kong,Hong Kong Ecology Department University of Hong Kong Hong Kong Hong Kong

To determine whether toxic diatoms in Hong Kong's Victoria Harbour have become more common during the last four decades,a gravity core was taken from the anaerobic sediments of Kowloon Bay in the harbour. Analysis of these sediments from a depth of 0-1cm,4-5cm and 9-10cm indicated that 6.4%,2.4% and 1.5% of the diatoms observed at each of these three respective depths belonged to the genus Pseudonitzschia. The abundance of Pseudonitzschia frustules in the surface sediments of Victoria Harbour was significantly higher(p<0.05)than it was in the harbour's deeper and older(ca.1965)sediments. The increase in potentially toxic diatom species over the last 30 years was attributed to a variety of factors including the addition of large amounts of nutrients to Hong Kong's coastal waters as a re- sult of man's activities.

关键词： paleoecology sediment cores marine diatoms toxic diatoms Pseudonitzschia.

TOTAL LIPID AND FATTY ACID COMPOSITION OF EIGHT STRAINS OF marine diatoms

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Chinese Journal of Oceanology and Limnology 2000年第4期18卷 345-349页

作者：梁英麦康森孙世春 Aquaculture Research Lab. Ocean University of QingdaoQingdao 266003China

Fatty acid composition and total lipid content of 8 strains of marine diatoms ( Nitzschia frustrula, Nitzschia closterium, Nitzschia incerta, Navicula pelliculosa,Phaeodactylum tricornutum, Synedra fragilaroides ) were examined. The microalgae were grown under defined conditions and harvested at the late exponential phase. The major fatty acids in most strains were 14:0 (1.0%-6.3%), 16:0 (13.5%-26.4%), 16:1n-7 (21.1%-46.3%) and 20:5n-3 (6.5%-19.5%). The polyunsaturated fatty acids 16:2n-4, 16:3n-4, 16:4n-1 and 20:4n-6 also comprised a significant proportion of the total fatty acids in some strains. The characteristic fatty acid composition of diatoms is readily distinguishable from those of other microalgal groups. Significant concentration of the polyunsaturated fatty acid 20:5n-3 (eicosapentaenoic acid) was present in each strain, with the highest proportion in B222 (19.5%).

关键词： fatty acid total lipid content marine diatoms

Chinia ***.—the second diatom genus simonsenioid raphe from mangroves in Fujian,China

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Journal of Oceanology and Limnology 2022年第3期40卷 1220-1232页

作者： Huina LIN Weiwei WU Lin SUN Andrzej WITKOWSKI Xiaoye LI Vishal PATIL Junrong LIANG Xuesong LI Yahui GAO Changping CHEN School of Life Sciences and Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems Xiamen UniversityXiamen 361102China State Key Laboratory of marine Environmental Science Xiamen UniversityXiamen 361102China Institute of marine and Environmental Sciences University of SzczecinMickiewicza 16aPL-70-383 SzczecinPoland

A new monotypic diatom genus Chinia *** estuarine mangrove habitats in Fujian,China is ***,scanning and transmission electron microscopy observations of its morphology show that this diatom differs from any established raphid diatom *** new genus is distinguished by a strongly undulate valve face,eccentric raphe canal,and perforated *** distinctly elevated and perforated raphe canal,classifi ed as simonsenioid type,is supported by sparse infundibulum-like portulae,and the portulae are separated by large *** valves of Chinia also have hymenate areolar occlusions and the raphe lacks a central ***,unlike most Bacillariaceae with two plastids,including Simonsenia,Chinia has a single plastid similar to those in Entomoneis and *** the similarities to Simonsenia,Chinia features porous raphe canal and loose striation,which is different from those of Simonsenia that has a solid raphe canal and distinct rows of *** distinctive cytological and morphological characters suggest an affinity of the new genus to the Bacillariaceae.

关键词： marine diatoms East China Sea taxonomy Bacillariaceae new genus simonsenioid raphe

Improving the genome and proteome annotations of the marine model diatom Thalassiosira pseudonana using a proteogenomics strategy

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marine Life Science & Technology 2023年第1期5卷 102-115页

作者： Xiao-Huang Chen Ming-Kun Yang Yuan-Yuan Li Zhang-Xian Xie Shu-Feng Zhang Mats Töpel Shady A.Amin Lin Lin Feng Ge Da-Zhi Wang State Key Laboratory of marine Environmental Science/College of the Environment and Ecology Xiamen UniversityXiamen361005China Southern marine Science and Engineering Guangdong Laboratory(Zhuhai) Sun Yat-Sen UniversityZhuhai519082China Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of SciencesWuhan430072China College of Chemistry Chemical Engineering and EnvironmentMinnan Normal UniversityZhangzhou363000China Department of marine Sciences University of GothenburgBox 46140530GothenburgSweden IVL-Swedish Environmental Research Institute Box 5302140014GothenburgSweden New York University Abu Dhabi Saadiyat Island129188Abu DhabiUnited Arab Emirates

diatoms are unicellular eukaryotic phytoplankton that account for approximately 20%of global carbon fixation and 40%of marine primary productivity;thus,they are essential for global carbon biogeochemical cycling and *** availability of ten diatom genome sequences has facilitated evolutionary,biological and ecological research over the past decade;however,a complimentary map of the diatom proteome with direct measurements of proteins and peptides is still ***,we present a proteome map of the model marine diatom Thalassiosira pseudonana using high-resolution mass spectrometry combined with a proteogenomic ***-depth proteomic profiling of three different growth phases and three nutrient-deficient samples identified 9526 proteins,accounting for~81%of the predicted protein-coding *** analysis identified 1235 novel genes,975 revised genes,104 splice variants and 234 single amino acid ***,our quantitative proteomic analysis experimentally demonstrated that a considerable number of novel genes were differentially translated under different nutrient *** findings substantially improve the genome annotation of *** and provide insights into new biological functions of *** relatively comprehensive diatom proteome catalog will complement available diatom genome and transcriptome data to advance biological and ecological research of marine diatoms.

关键词： marine diatoms Thalassiosira pseudonana Proteome Proteogenomics

Synthesis of Three-Dimensional Agaric-like Biomorphic TiO_2 by a Facile Method with Coscinodiscus ***

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Journal of Ocean University of China 2012年第4期11卷 507-510页

作者： ZHANG Qianqian CHEN Ran LI Ling Department of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100P.R.China

The paper aims to expand the application of natural marine algae. marine diatoms, which have intricate frustule struc- tures, can serve as bio-template for preparing three-dimensional materials. A simple and effective approach to synthesize the corru- gated agaric-like biomorphic TiO2 templated with frustule of Coscinodiscus sp. is reported. In the sol-gel preparation process, the titania-coating on the frustule is prepared through the deposition and condensation with the aid of acetylacetone （acac） as a control- ling agent to make the precursor Ti（BuO）4 hydrolyze slowly. The as-prepared titania-coated frustule and biomorphic TiOz is charac- terized by scanning electron microscopy （SEM） attached with energy dispersive X-ray spectrometer （EMAX） and X-ray diffraction （XRD）. The microstructure of the corresponding titania nanoparticles appears to be sphere with the diameters distributed around 10-20nm. The templating process is repeated for three cycles. Subsequently, the three-dimensional freestanding corrugated aga- ric-like biomorphic TiO2 structure is obtained by a selective removal in the NaOH solution. As far as we known, the 3D freestanding corrugated agaric-like biomorphic TiOz with greatly increased surface area is obtained for the first time.

关键词： marine diatoms frustule Coscinodiscus sp. biomorphic Ti02 microstructure