Toxicity and Accumulation of Selenite in Four Microalgae

【英文摘要】 The toxicity and bioaccumulation of selenite in four microalgae, Spirulina platensis, Dunaliella salina, Dunaliella bardawill and Phaeodactylum tricornutum cultured in the presence of selenite were investigated. Lower concentrations of selenite were generally nontoxic and frequently stimulated algal growth, while higher concentrations of selenite inhibited algal growth. Selenite was more toxic to D. salina and D. bardawill than to S. platensis and P. tricornutum . All algae cultured i...This work was supported by Natural Science Foundation of China (39270539)and the Science and Technology Commission of Fujian Province(Keyproject

Effects of germanium toxicity on the morphology and ultrastructure of four species of microalgae.

　　将钝顶螺旋藻（Ｓｐｉｒｕｌｉｎａｐｌａｔｅｎｓｉｓ）、盐生杜氏藻（Ｄｕｎａｌｉｅｌａｓａｌｉｎａ）、湛江叉鞭金藻（Ｄｉｃｒａｔｅｒｉａｚｈａｎｊｉａｎｇｅｎｓｉｓ）、微绿藻（Ｎａｎｎｏｃｈｌｏｒｏｐｓｉｓ．ｓｐ）４种微藻培养在含１０ｍｇ／ｄｍ３锗的溶液中，研究了锗毒性对藻类细胞形态和超微结构的影响。结果表明，经锗处理的微藻细胞多变形且易破裂，胞壁和原生质体结合疏松，一些细胞的鞭毛变得细长弯曲或缺失。细胞超微结构中叶绿体（类囊体）、线粒体受锗毒性的影响最大，其它一些结构如细胞核、脂含物、淀粉与液泡等也受到了影响，但不同种间差异较大。这些结果表明，细胞内的能量传递系统受到明显影响，从而影响到细胞内有机质的合成、累积及细胞的生长 【英文摘要】 Four microalgae: Spirulina platensis, Dunaliella salina, Dicrateria zhanjiangensis and Nannochloropsis sp. were exposed to 10 mg/dm 3 germanium(Ge), the morphology and ultrastructure changes in cells were studied.The results showed that more cells treated with Ge became deformed and cracked,cell wall linked with protoplasm loosely,and flagellates became longer and brooked or lost in some cells.Among ultrastructures,the mitochondria and chloroplasts(or thylakoids) were the most affected by Ge,other chan...　　国家教委博士点基

Effects of germanium on photosynthetic pigments of four species in microalgae

【中文摘要】 采用溶液培养方法 ,以锗作为胁迫因子 ,研究了锗对 4种微藻 :钝顶螺旋藻 ( Spirulina platensis)、盐生杜氏藻( Dunaliella salina)、湛江叉鞭金藻 ( Dicrateria zhanjiangensis)和微绿藻 ( N annochloropsis.sp)光合色素的影响。实验结果表明 ,经 1 0 mg/ dm3锗处理后 ,四种藻类细胞中的光合色素都发生了较大变化 ,有些色素发生明显的增加或形成 ,有些色素则减少或消失 ,但不同种间差别较大。此外还对锗的作用机理进行了探讨。 【英文摘要】 Four microalgae, Spirulina platensis,Dunaliella salina,Dicrateria zhanjiangensis and Nannochloropsis sp.were cultured in a solution with concentration of 10 mg/dm 3 germanium for 10 d (for S.platensis ) and 16d(for the other algae)to study photosynthetic pigments in these algae.The results showed that photosynthetic pigments and their contents in these four algae were changed greatly,some increased or formed and the others decreased or disappeared,the changes of the pigments varied greatly among ...国家教委博士点基金资助项目(编号:9538408

Marine diatoms in waters arornd Xisha Islands,South China Sea Ⅳ. Group inaequales in Mastogolia Thwaites

用光镜（lM）、透射电镜（TEM）和扫描电镜（SEM）记录了属于胸隔藻属（MASTOglOIA）不等组（InAEQuAlES）的9种硅藻的内外壳面的结构。其中有5种（M.AMOyEnSIS，M.EryTHrAEA，M.InAEQuAlIS，M.MAnEkWArEnSIS和M.TEnnIS）做了TEM和SEM的观察。The group inaequales of nine species of Mastogloia Thwaites were recorded in terms of morphological structure with LM,SEM and TEM.The species included Mastogloia amoyensis, M.angulata, M.cuneata, M.erythraea, M.inaegualis, M.manokwariensis, M.tenuis,M.triundulatus and M.vulnerata.国家自然科学基金!39570142

MARINE DIATOMS of XISHA ISLANDS,SOUTH CHINA SEA─ Ⅲ.ONE NEW SPECIES of MASTOGLOIA AND FIVE NEW SPECIES RECORDS of OTHER GENERA

在西沙群岛潮间带底栖硅藻的研究中发现了1个新种──三波胸隔藻MASTOglOIATrIundulATASP.nOV.和5个新记录：楔形胸隔藻MASTOglOIACunEATA（MEISTEr）SIMOnSEn，红胸隔藻椭圆变种MASTOglOIAEryTHrAEAVAr.EllIPTICAVOIgT,，红胸隔藻格鲁变种MASTOglOIAEryTHrAEAVAr.grunOWIIfOgEd,缢缩棒杆藻小形变种rHOPAlOdIACOnSTrICTAVAr.MInOrkrAMMEr和具盖棒杆藻伸长变种rHOPAlOdIAOPErCulATAVAr.PrOduCTAgrunOW.Samples were collected From the intertidal zone of the Xisha Islands,Hainan Province.Taxonomic innovations comprised of one new species, Mastogloiatriundulata sp.nov.and Five new records For China.Mastogloia triundulata Liu sp.nov.(plate I;3)Valvae navicula, 64μm longa, lopm lata, 6.4 plo longiora guam lahor.Rapherecta, inter leviter costas longitUdinales itnmergit punchs longitudinales and punctistransversalibus near perpendicularis each, 25/28 in 10μm.Prtctal ring undulata, 16-18 in 10μm, about 2μm lata in wavedpeak and about lpm in waved valley.Types:SX 820305-6(4), Facultas Biologica Universitahs Amoiensis.国家自然科学基金!3957014

Marine diatoms in waters arornd Xisha Islands,South China Sea Ⅳ. Group inaequales in Mastogolia Thwaites

用光镜（lM）、透射电镜（TEM）和扫描电镜（SEM）记录了属于胸隔藻属（MASTOglOIA）不等组（InAEQuAlES）的9种硅藻的内外壳面的结构。其中有5种（M.AMOyEnSIS，M.EryTHrAEA，M.InAEQuAlIS，M.MAnEkWArEnSIS和M.TEnnIS）做了TEM和SEM的观察。The group inaequales of nine species of Mastogloia Thwaites were recorded in terms of morphological structure with LM,SEM and TEM.The species included Mastogloia amoyensis, M.angulata, M.cuneata, M.erythraea, M.inaegualis, M.manokwariensis, M.tenuis,M.triundulatus and M.vulnerata.国家自然科学基金!39570142

Late Quaternary diatom remains in South China Sea and their geological signiFicance Ⅷ.Discussion on some problems

本文根据分析结果阐述了两种不同样品处理方法所获得的硅藻丰度和微型硅藻的人主要种类和相对百分含量。研究表明洗涤富集法所获得的硅藻丰度存在较大误差；微型硅藻的含量普遍介于10%~20%之间，最高可达42.31%，最低为5.66%，并指出了在微型硅藻相对含量大于20%的样品中，其主要种类为具槽直链藻和条纹小环藻等沿岸底栖种，并成群体产出。最后指出了伯戈根管藻和短刺角毛藻在三柱样剖面中的数量分布与晚第四纪的气候冷暖更替无密切联系。Diatom abundance and the main micro-diatom species and relative percentage content obtained aFter two diFFerent sample treatment methods are summarily described based on the analyzed results of late Quaternary sediments From the South China Sea.our studies indicate that the washing-enrichment method introduces more error of diatom abundance.The content of micro-diatom is commonly between 10%～20% with the highest of 42.31 % and the lowest of 5.66%.In the samples with relative content of micro-diatom more than 20%, the main species are coastal benthic species such as Melosira sulcata and Cyclotella striata and mostly occur as colonies.At last,it is shown that there is no close relationship between the content distribution of Rhizosolenia bergonii and Chaetoceros messanensis in the three cores studied and climatic cold-warm alternation in late Quaternary.国家自然科学基金!4917627

MARINE DIATOMS of THE XISHA ISLANDS, SOUTH CHINA SEA Ⅰ. Notes on Two New Species and New Records For Amphora Ehrenherg

在西沙群岛湖间带底栖硅藻的研究中发现了2个新种。AMPHOrAPunCTATASP.nOV，AMPHOrAMICrOMETrOIdESSP.nOV，1个待定种和AM.Af.CASTEllATA等14个新记录。Samples were collected From the intertidal zone of Xisha Islands, Hainan Province.Taxonomic innovations comprised of two new species, Amphora puncata sp.nov.and Amphora micrometroides sp.nov, one aF.species and Fourteen new records For China

Late Quaternary diatom remains in South China Sea and their geological signiFicance Ⅵ. Notes on new species and new records of diatoms

本文记述了南海晚第四纪沉积物中发现的两个新种[线形辐环藻（ACTInOCyCluSlInEATuSlIuCHEngETlAnSPnOV.）、星圆筛藻（COSInOdISCuSASTEr-AEuSCHEng，lIuETlAnSP.nOV，）]以及在我国首次记录的国筛藻的7个种。In the study of diatoms collected From three sediment cores of Late Quaternary in SouthChina Sea,two new species of Actinocyclus Rhr.and Coscinodiscus Eh.- and 7 new records ofCoscinodiscus Rhr.were Found.国家自然科学基金!4917626

Late Quaternary diatom remains From South China Sea and their geological signiFicance Ⅴ. Diatom Genus Liriogramma Kolbe

硅藻门（bACIllArIOPHyTA）沟纹藻属（lIrIOgrAMMAkOlbE）在我国是1个新记录的属。该属最先由kOlbE（1954）在西太平洋赤道区（2°52＇S，89°50＇W，水深3225M）的柱状样沉积物中找到1种，订名l.PETTErSSOnII。之后，又在1955年从大西洋（0°7＇n，18°12＇E；0°8＇n，16°19＇E）和太平洋（6°44＇n，129°28＇W；2°52＇S，89°5＇W）的柱状样沉积物中找到另1种，订名l.HuSTEdTII。笔者在南海第四纪的一个柱状样，距今约120kA（晚更新世）至11kA（全新世）的沉积物里找到了迄今该属已记录的2个种。此外，还记录了新组合的种：lIrIOgrAMMASArCOPHAgu（WAllICH）nOV.COMb.Liriogramma Kolbe (Bacillariophyta ) is a new record of diatom genera in China.The genus was First described by Kolbe (1954) with the species L.petterssonii in sediment cores From the West PaciFic Ocean (2°52'S, 89°50' W, depth: 3 22.5m ).In 1955, another species L.hustedtii was Found in the sediment cores From the Atlantic Ocean (0°7' N, 18°12' E; 0°8' N, 16°19' E) and the PaciFic Ocean (6°44' N, 1 29°28' W; 2°52'S, 8°95'W ).We Found the above two species in a Quaternary sediment core From the South China Sea, which ranged From about 1 20ka ago (Late Pleistocene ) to 11ka ago (Holocene ), Anew combination L.sarcophagus (Wallich) nov.comb.is described in the present paper.国家自然科学基金!4917626