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Identification of novel salt stress-responsive microRNAs through sequencing and bioinformatic analysis in a unique halophilic Dunaliella salina strain
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作者 Fan GAO Fangru NAN +4 位作者 Jia FENG Junping LÜ Qi LIU Xudong LIU Shulian XIE 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2023年第4期1558-1574,共17页
Dunaliella salina is a classic halophilic alga.However,its molecular mechanisms in response to high salinity at the post transcriptional level remain unknown.A unique halophilic alga strain,DS-CN1,was screened from fo... Dunaliella salina is a classic halophilic alga.However,its molecular mechanisms in response to high salinity at the post transcriptional level remain unknown.A unique halophilic alga strain,DS-CN1,was screened from four D.salina strains via cell biological,physiological,and biochemical methods.High-throughput sequencing of small RNAs(sRNAs)of DS-CN1 in culture medium containing 3.42-mol/L NaCl(SS group)or 0.05-mol/L NaCl(CO group)was performed on the BGISEQ-500 platform.The annotation and sequences of D.salina sRNAs were profiled.Altogether,44 novel salt stress-responsive microRNAs(miRNAs)with a relatively high C content,with the majority of them being 24 nt in length,were identified and characterized in DS-CN1.Twenty-one differentially expressed miRNAs(DEMs)in SS and CO were screened via bioinformatic analysis.A total of 319 putative salt stress-related genes targeted(104 overlapping genes)by novel miRNAs in this alga were screened based on our previous transcriptome sequencing research.Furthermore,these target genes were classified and enriched by GO and KEGG pathway analysis.Moreover,5 novel DEMs(dsa-mir3,dsa-mir16,dsa-mir17,and dsa-mir26 were significantly upregulated,and dsa-mir40 was significantly downregulated)and their corresponding 10 target genes involved in the 6 significantly enriched metabolic pathways were verified by quantitative real-time PCR.Next,their regulatory relationships were comprehensively analyzed.Lastly,a unique salt stress response metabolic network was constructed based on the novel DEM-target gene pairs.Taken together,our results suggest that 44 novel salt stress-responsive microRNAs were identified,and 4 of them might play important roles in D.salina upon salinity stress and contribute to clarify its distinctive halophilic feature.Our study will shed light on the regulatory mechanisms of salt stress responses. 展开更多
关键词 dunaliella salina salt stress response small RNA(sRNAs)sequencing microRNA(miRNAs)
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Fe对两株盐生杜氏藻(Dunaliella salina)生长和β-胡萝卜素积累的影响 被引量:4
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作者 王培磊 刘明河 +1 位作者 张学成 孟振 《食品研究与开发》 CAS 北大核心 2007年第5期39-43,共5页
研究了柠檬酸铁对两株盐生杜氏藻Dunaliella salina OUN04和D.salina OUN09生长和色素积累的影响,结果表明,D.salina OUN04生长最适的Fe浓度为0.05mmol/L,细胞密度达111.5×104cell/mL,0.25mmol/LFe组最低(70×104cell/mL);最大... 研究了柠檬酸铁对两株盐生杜氏藻Dunaliella salina OUN04和D.salina OUN09生长和色素积累的影响,结果表明,D.salina OUN04生长最适的Fe浓度为0.05mmol/L,细胞密度达111.5×104cell/mL,0.25mmol/LFe组最低(70×104cell/mL);最大β-胡萝卜素含量(83.2mg/g)出现在0.25mmol/LFe浓度组中;Fe浓度为0.25mmol/L时有最大的叶绿素a含量(98.4mg/g);建立了杜氏藻对Fe吸收的动力学方程。D.salina OUN09生长最适的Fe浓度为0.05mmol/L(密度131×104cell/mL),最大β-胡萝卜素含量为130.2mg/g(0.05mmol/LFe组),对照组仅为70.4mg/g。 展开更多
关键词 杜氏藻dunaliella SALINA 柠檬酸铁 Β-胡萝卜素 叶绿素A 利用规律
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Dunalidlla bardawil中类胡萝卜素的高效液相色谱分析及其与Dunaliella salina的比较 被引量:1
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作者 姜建国 朱跃辉 房科腾 《食品科学》 EI CAS CSCD 北大核心 2004年第5期147-149,共3页
采用Bood-Pak C18和Nova-Pak C18两种色谱柱对Dunaliella bardewil中的类胡萝卜素进行了高效液相色谱分析和比较,结果表明在相同的实验条件下,Bood-Pak C18对盐藻中类胡萝卜素的分离效果明显好于Nova-Pak C18。对Bond-Pak C18分析结果... 采用Bood-Pak C18和Nova-Pak C18两种色谱柱对Dunaliella bardewil中的类胡萝卜素进行了高效液相色谱分析和比较,结果表明在相同的实验条件下,Bood-Pak C18对盐藻中类胡萝卜素的分离效果明显好于Nova-Pak C18。对Bond-Pak C18分析结果进行了定性分析,初步确定Dunaliella bardawil含有的类胡萝卜素有14种以上。同时进行了Dunaliella bardewil和Dunaliella salina类胡萝卜素的比较,表明两种藻主要的类胡萝卜素的成分和含量非常接近,色谱图相似程度很高。 展开更多
关键词 类胡萝卜素 高效液相色谱分析 Dunalidlla bardawil dunaliella bardewil
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Cloning and Characterization of β-actin Gene in Dunaliella parva 被引量:1
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作者 尚常花 朱顺妮 +1 位作者 袁振宏 王忠铭 《Agricultural Science & Technology》 CAS 2011年第7期971-974,共4页
[Objective] The aim was to obtain the full-length cDNA sequence of Dunaliella parva β-actin gene.[Method] Based on the highly conserved amino acid regions of known β-actin,a pair of degenerate primers was synthesize... [Objective] The aim was to obtain the full-length cDNA sequence of Dunaliella parva β-actin gene.[Method] Based on the highly conserved amino acid regions of known β-actin,a pair of degenerate primers was synthesized to amplify 533 bp cDNA sequences in Dunaliella parva.Then,the 5' genomic DNA and 3' cDNA sequences were obtained by Genome walking and 3'-RACE technology based on the obtained sequence.According to the sequences of the 5'-termini and 3'-termini,specific primers were synthesized to obtain the full-length cDNA.[Result] The full-length β-actin cDNA included 1 137 bp open reading frame(ORF),617 bp of 3' noncoding region.Similarity analysis indicated that the highest similarity was found between Dunaliella parva and Dunaliella salina.The Dunaliella parva β-actin also showed wide similarity with other algae.[Conclusion] The full-length cDNA sequence of D.parva was firstly obtained,which was highly conserved. 展开更多
关键词 dunaliella parva β-actin gene CLONING
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杜氏盐藻(Dunaliella salina)超微结构研究 被引量:2
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作者 张西玉 白林含 陈维琼 《乐山师范学院学报》 2000年第3期54-56,共3页
Dunaliella salina具有薄而不均匀的外被膜。鞭毛为“9+2”结构。眼点位于细胞质中。内质网丰富。线粒体形状多样。叶绿体呈“杯形”。首次在杜氏藻中发现两个大型造粉粒。细胞核位于叶绿体凹窝中,核仁存在时期很短。
关键词 dunaliella SALINA 超微结构
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Advances in Studies on Molecular Mechanism of Salt Tolerance in Dunaliella salina 被引量:2
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作者 武天祥 柴晓杰 +2 位作者 丛玉婷 刘丽颖 刘艺琼 《Agricultural Science & Technology》 CAS 2016年第2期291-293,300,共4页
Dunaliella salina is known as one of the most salt-tolerant eukaryotic or- ganisms, and the most ideal model organism for studying plant adaption to high salinity. In recent years, the study on molecular mechanism of ... Dunaliella salina is known as one of the most salt-tolerant eukaryotic or- ganisms, and the most ideal model organism for studying plant adaption to high salinity. In recent years, the study on molecular mechanism of salt tolerance in Dunaliella salina has become the focus of scholars at home and abroad with the development of molecular biological techniques. This study reviewed studies on adaption of Dunaliella salina to high salinity in aspects of osmotic adjustment, salt tolerance-related genes and proteins of Dunaliella salina and signal transduction pathway of salt stress. 展开更多
关键词 dunaliella salina Molecular mechanism Research progress
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通过cDNARDA法分离和识别盐藻(Dunaliella salina)盐胁迫相关基因 被引量:10
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作者 方孝东 黄薇 +2 位作者 林栖凤 李冠一 屈良鹄 《中国生物化学与分子生物学报》 CAS CSCD 北大核心 2004年第1期67-72,共6页
采用cDNA代表性差异分析 (RDA)技术 ,对盐藻在盐胁迫时差异表达的基因进行了分离鉴定 .在分离到的 10个基因中 ,有 5个与已知基因同源 (包括叶绿素a b结合蛋白基因、蛋白磷酸酶I催化亚基基因和 3个核糖体蛋白基因 ) ,还有 5个未知功能... 采用cDNA代表性差异分析 (RDA)技术 ,对盐藻在盐胁迫时差异表达的基因进行了分离鉴定 .在分离到的 10个基因中 ,有 5个与已知基因同源 (包括叶绿素a b结合蛋白基因、蛋白磷酸酶I催化亚基基因和 3个核糖体蛋白基因 ) ,还有 5个未知功能基因则是首次在盐藻中被分离 .值得注意的是 ,所有这 5个已知基因的功能都与细胞分裂或盐胁迫有关 .结果表明 :取样时盐藻细胞仍处于恢复阶段 ,所分离到的基因对于盐藻耐盐可能具有重要意义 ;蛋白磷酸酶I的下调表达可能是盐藻调节离子平衡的一个重要过程和细胞分裂受阻的原因所在 ;盐藻减缓细胞分裂速度可能是为了减少能量消耗 ,以留出足够的能量来应对盐胁迫 ;其它 5个未知基因可能也与盐藻适应盐胁迫机制有关 . 展开更多
关键词 盐藻 盐胁迫 差异表达 基因分离鉴定 代表性差异分析
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Cr^(3+)对盐藻(Dunaliella salina)生长及营养品质的影响 被引量:12
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作者 张学颖 李爱芬 +2 位作者 刘振乾 段舜山 李丹 《生态科学》 CSCD 2003年第2期138-141,共4页
以盐藻Dunaliella salina为材料,设定0ìg·L^(-1)、3ìg·L^(-1)、12ìg·L^(-1)、50ìg·L^(-1)、200ìg·L^(-1)和800ìg·L^(-1)6个添加Cr^(3+)浓度处理,分析测定了不同铬浓度下... 以盐藻Dunaliella salina为材料,设定0ìg·L^(-1)、3ìg·L^(-1)、12ìg·L^(-1)、50ìg·L^(-1)、200ìg·L^(-1)和800ìg·L^(-1)6个添加Cr^(3+)浓度处理,分析测定了不同铬浓度下盐藻的生物量(细胞密度)。蛋白质、a-胡萝卜素和可溶性糖含量。研究结果表明,中低量添加 Cr^(3+)对盐藻的生长有一定的促进作用,在50ìg·L^(-1)和200ìg·L^(-1)Cr^(3+)条件下,盐藻的生物量高于对照,中低量添加Cr^(3+)对盐藻的生长有一定的促进作用,盐藻蛋白质含量比对照分别提高3.06%和 6.55%,Cr^(3+)浓度在200ìg·L^(-1)时,盐藻的a-胡萝卜素和可溶性糖含量比对照分别提高3.93%和2.38%,适当添加Cr^(3+)可提高盐藻蛋白质、a-胡萝卜素和可溶性糖含量,有效改善盐藻的营养品质。 展开更多
关键词 CR^3+ 盐藻 生长 营养品质 蛋白质 a-胡萝卜素
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盐生杜氏藻(Dunaliella salina)cDNA文库构建及功能基因筛选(英文) 被引量:8
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作者 李钢 刘敏 +2 位作者 蒋彦 乔代蓉 曹毅 《热带亚热带植物学报》 CAS CSCD 北大核心 2004年第1期74-78,共5页
采用Qiagen公司的植物总RNA提取技术、Clontech公司的CreatorTM技术平台以及SMARTTM技术进行cDNA文库构建。从杜氏藻中提取出了高质量的总RNA,通过PowerScript反转录酶反转录杜氏藻的总RNA,采用LD-PCR、酶处理等方法对cDNA进行等比例扩... 采用Qiagen公司的植物总RNA提取技术、Clontech公司的CreatorTM技术平台以及SMARTTM技术进行cDNA文库构建。从杜氏藻中提取出了高质量的总RNA,通过PowerScript反转录酶反转录杜氏藻的总RNA,采用LD-PCR、酶处理等方法对cDNA进行等比例扩增、纯化,同时使用CHROMASPIN-400柱子将cDNA分段化,最后将长片段连入pDNR-LIB质粒,1.5kV,25μF电转化大肠杆菌JM109,得到含1.5×106个克隆子的原始文库,滴度为1.5×106cfuml-1。结合酶切和PCR,对该文库的质量进行了鉴定和统计,文库的平均片段插入长度为1.5kb。采用烯醇酶和UDP葡萄糖脱氢酶的EST作为同源探针,对文库中的功能基因进行筛选,并采用放射性原位杂交法,对扩增文库进行了初筛和复筛,得到了含这两条基因全编码序列的cDNA,烯醇酶为1.8kb,UDP葡萄糖脱氢酶为1.9kb,为今后对该种进行大规模功能基因组学研究奠定基础。 展开更多
关键词 盐生杜氏藻 CDNA文库 功能基因组学
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利用 RAPD分析杜氏藻属 (Dunaliella)嗜盐种间遗传多样性 被引量:9
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作者 李钢 蒋彦 +1 位作者 乔代蓉 曹毅 《西北植物学报》 CAS CSCD 2002年第3期511-515,共5页
本研究首次运用随机引物对杜氏藻属 (Dunaliella)中 6个嗜盐种的基因组 DNA进行RAPD分析。筛选获得的 6个有效引物共扩增出 98个可重复的 DNA片段 ,其中 95条带具有多态性 ,多态性条带的频率为 96 .9%。根据系统进化树图将杜氏藻属 6个... 本研究首次运用随机引物对杜氏藻属 (Dunaliella)中 6个嗜盐种的基因组 DNA进行RAPD分析。筛选获得的 6个有效引物共扩增出 98个可重复的 DNA片段 ,其中 95条带具有多态性 ,多态性条带的频率为 96 .9%。根据系统进化树图将杜氏藻属 6个种分别归于亲缘关系相对较远的 2个类群中 ,且 展开更多
关键词 RAPD分析 杜氏藻属 嗜盐种 遗传多样性
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杜氏藻Dunaliella peircei超微结构研究 被引量:5
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作者 刘广发 楼士林 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 1993年第3期351-355,共5页
两类糖蛋白纤维构成了Dunaliella peirces的细胞外被,鞭毛和基本分别为“9+2”和“9+0”结构,首次发现的中心粒由9个三联体组成,高尔基体1~2个,眼点位于细胞质中,由二排椭圆形小球构成,内质网丰富,线粒体形状多样,在“杯形”叶绿体中... 两类糖蛋白纤维构成了Dunaliella peirces的细胞外被,鞭毛和基本分别为“9+2”和“9+0”结构,首次发现的中心粒由9个三联体组成,高尔基体1~2个,眼点位于细胞质中,由二排椭圆形小球构成,内质网丰富,线粒体形状多样,在“杯形”叶绿体中发现了雏形的基粒及“杯”上的小孔,叶绿体前端凹凸不平,后端具大型淀粉核一个,细胞核位于“杯形”叶绿体的凹窝中。 展开更多
关键词 超微结构 杜氏藻
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杜氏藻(Dunaliella sp.)多糖DPS-1的提取分离纯化和糖基组成分析 被引量:1
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作者 李亚清 张华微 +3 位作者 杨海波 王心满 崔丽华 石玉红 《海洋环境科学》 CAS CSCD 北大核心 2008年第3期217-219,共3页
以实验室培养的新鲜的杜氏藻为原料,采用冻结-融化冷水提取、乙醇沉淀,Sephadex G-100柱层析等一系列步骤,分离纯化得到杜氏藻多糖,简称DPS-1。醋酸纤维素薄膜电泳和Sephadex G-50柱层析对DPS-1进行纯度鉴定,结果表明该糖组分均一。IR... 以实验室培养的新鲜的杜氏藻为原料,采用冻结-融化冷水提取、乙醇沉淀,Sephadex G-100柱层析等一系列步骤,分离纯化得到杜氏藻多糖,简称DPS-1。醋酸纤维素薄膜电泳和Sephadex G-50柱层析对DPS-1进行纯度鉴定,结果表明该糖组分均一。IR、UV等理化性质测定及HPAEC-PAD分析,结果表明该糖含有硫酸根,糖环为吡喃环。组成DPS-1的糖基有:D-岩藻糖、D-鼠李糖、2-D-氨基葡萄糖、D-半乳糖、D-葡萄糖和两种未知单糖。其摩尔比为D-岩藻糖∶D-鼠李糖∶2-D-氨基葡萄糖∶D-半乳糖∶D-葡萄糖=2.1∶1∶1.6∶2.3∶4.2。另外还检出了两种已知糖醛酸,分别是半乳糖醛酸和葡萄糖醛酸。其摩尔比为半乳糖醛酸∶葡萄糖醛酸=1∶3.4。 展开更多
关键词 杜氏藻 多糖 糖基 组成
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Prokaryotic Expression and Purification of Ds MAPK from Dunaliella salina
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作者 岳文静 柴晓杰 +2 位作者 刘丽颖 武天祥 刘艺琼 《Agricultural Science & Technology》 CAS 2015年第1期12-15,共4页
Dunaliella salina is an important model organism for investigating the salt tolerance mechanism of plant. MAPK is the key gene in the molecular pathway of salt tolerance of plant. In this experiment, the open reading ... Dunaliella salina is an important model organism for investigating the salt tolerance mechanism of plant. MAPK is the key gene in the molecular pathway of salt tolerance of plant. In this experiment, the open reading frame (ORF) of DsMAPK gene was amplified by PCR. The target fragment was cloned in pGS-21a, a prokaryotic expression vector with GST-tag. The recombinant plasmid pGS-21a- DsMAPK was then transformed into E. coil BL21 (DE3). The expression was induced with IPTG. Then the expression form of the recombinant protein was analyzed. The expression products were purified with GST-SefinoseTM Kit and identified with SDS-PAGE and Western blot. The results showed the recombinant expression vector pGS-21a-DsMAPK was constructed successfully, and the molecular weight of the expressed recombinant protein was as same as expected. Western blot analysis showed the purified recombinant protein could be identified specially by the anti- GST antibody and had a good immunological activity. The successful expression of DsMAPK will lay a basis for the further research on the role of DsMAPK in the salt tolerance mechanism at the protein level. 展开更多
关键词 dunaliella salina DsMAPK Prokaryotic expression PURIFICATION
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Transcriptome analysis of carotenoid biosynthesis in Dunaliella salina under red and blue light 被引量:3
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作者 LI Yuanxiang CAI Xuehua +1 位作者 GU Wenhui WANG Guangce 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2020年第1期177-185,I0016-I0018,共12页
The quality of light is an important abiotic factor that affects the growth and development of photosynthetic organisms.In this study,we exposed the unicellular green alga Dunaliella salina to red(660 nm)and blue(450 ... The quality of light is an important abiotic factor that affects the growth and development of photosynthetic organisms.In this study,we exposed the unicellular green alga Dunaliella salina to red(660 nm)and blue(450 nm)light and analyzed the cell growth,total carotenoid content,and transcriptomes.The growth of D.salina was enhanced by illumination with red light,whereas blue light was not able to promote the algal growth.In contrast,the total carotenoid content increased under both red and blue light.The RNA of D.salina was sequenced and the transcriptomic response of algal cells to red and blue light was investigated.Six transcripts encoding for the blue light receptor cryptochrome were identified,and transcripts involved in the carotenoid metabolism were up-regulated under both red and blue light.Transcripts encoding for photoprotective enzymes related to the scavenging of reactive oxygen species were up-regulated under blue light.The present transcriptomic study provides a more comprehensive understanding of carotenoid biosynthesis in D.salina under different wavelengths of light. 展开更多
关键词 blue LIGHT CAROTENOID dunaliella RED LIGHT TRANSCRIPTOME
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Phylogenetic and Morphological Investigation of a Dunaliella Strain Isolated from Yuncheng Salt Lake,China 被引量:4
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作者 WANG Feipeng FENG Jia +2 位作者 WANG Jie LI Bo XIE Shulian 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期106-107,共2页
A Dunaliella strain was isolated from Yuncheng Salt Lake,Shanxi,China(111.05°E,35.03°N).Morphological characteristics and molecular data were used to evaluate the relationship of this algal strain to other D... A Dunaliella strain was isolated from Yuncheng Salt Lake,Shanxi,China(111.05°E,35.03°N).Morphological characteristics and molecular data were used to evaluate the relationship of this algal strain to other Dunaliella 展开更多
关键词 dunaliella Morphology PHYLOGENY
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人canstatin基因转化新型生物反应器——杜氏盐藻(Dunaliella salina)的初步研究 被引量:1
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作者 冯书营 谷辉辉 +1 位作者 刘红涛 薛乐勋 《中国生物工程杂志》 CAS CSCD 北大核心 2008年第6期55-59,共5页
采用RT-PCR技术从人的胎盘组织中克隆canstatin基因,定向连接到表达载体pUΩ上,然后与筛选标记bar盒连接得到真核表达载体pU Ω-Can-Bar。采用玻璃珠转化法将该表达载体转化杜氏盐藻(以下简称盐藻),通过草丁膦固体平板筛选得到转化株,... 采用RT-PCR技术从人的胎盘组织中克隆canstatin基因,定向连接到表达载体pUΩ上,然后与筛选标记bar盒连接得到真核表达载体pU Ω-Can-Bar。采用玻璃珠转化法将该表达载体转化杜氏盐藻(以下简称盐藻),通过草丁膦固体平板筛选得到转化株,进而对转化株进行阳性鉴定。PCR结果显示,在盐藻转化株中均能够扩增出约700 bp特异的条带,而在阴性对照中没有扩增出该条带。Southern blot结果进一步证明人canstatin基因已经整合到盐藻细胞的基因组中。此外,对盐藻转化株的遗传稳定性进行了分析,结果表明canstatin基因能够在转化藻株中稳定遗传。人canstatin转基因盐藻株的成功制备为利用盐藻反应器大规模生产人canstatin蛋白提供了实验依据,为及早实现canstatin蛋白在治疗肿瘤上的临床应用提供了前期工作基础。 展开更多
关键词 人canstatin 转化 新型反应器 杜氏盐藻
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Characterization and Expression Analysis of Protein Kinase C Gene from Dunaliella salina 被引量:2
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作者 CONG Yuting MA Yuexin +2 位作者 WANG Yuan LIU Yiqiong CHAI Xiaojie 《Journal of Ocean University of China》 SCIE CAS CSCD 2019年第4期977-984,共8页
Protein kinase C (PKC) has a crucial role in signal transduction for a variety of biologically active substances which activate cellular functions and proliferation. We previously isolated the full-length PKC gene fro... Protein kinase C (PKC) has a crucial role in signal transduction for a variety of biologically active substances which activate cellular functions and proliferation. We previously isolated the full-length PKC gene from Dunaliella salina (DsPKC) using rapid amplification of cDNA ends (RACE) and RT-PCR methods. And we submitted the mRNA sequence of DsPKC gene to NCBI (Genbank No. JN625213). In the present paper, the DsPKC gene open reading frame obtained by PCR was cloned into pGS-21a vector and transformed into Escherichia coli to generate the fusion protein. Bioinformatics analysis revealed that DsPKC gene was a member of serine/threonine kinase with two conserved domains and highly conserved motifs. The DsPKC was highly expressed upon induction with isopropyl-β-d-thiogalactoside (IPTG) at a final concentration of 0.2 mmol L 1 at 37℃. Under salt stress, the fu- sion protein Green Fluorescent Protein (GFP)-DsPKC was transferred from the cytoplasm to the cell membrane. The expression pat- tern of DsPKC gene was analyzed using real-time quantitative PCR, and indicated that DsPKC gene was up-regulated by 3.0 mol L 1 NaCl at 12 h, which was significantly higher than in control values (P < 0.05). These results suggest that the DsPKC gene plays an important role in response to salt stress in D. salina. 展开更多
关键词 dunaliella SALINA protein kinase C gene PROKARYOTIC expression SUBCELLULAR localization salt stress
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Interspecific competition and allelopathic interaction between Karenia mikimotoi and Dunaliella salina in laboratory culture 被引量:3
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作者 何冬 刘娇 +3 位作者 郝锵 冉莉华 周斌 唐学玺 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2016年第2期301-313,共13页
Algal allelopathy is a manifold ecological/physiological phenomenon that is focused on chemical interactions and autotoxicity. We investigated the allelopathic interactions between Karenia mikimotoi and Dunaliella sal... Algal allelopathy is a manifold ecological/physiological phenomenon that is focused on chemical interactions and autotoxicity. We investigated the allelopathic interactions between Karenia mikimotoi and Dunaliella salina in laboratory cultures based on different temperature (15℃, 20℃, and 25℃) and lighting (40,80, and 160 umol/(m2·s)) conditions. The growth of D. salina in bi-algae culture (1:1 size/density) was significantly restrained. The results of cell-free filtrate culture indicate that direct cell-to- cell contact was not necessary in interspecific competition. Further experimental results demonstrated that allelochemicals released from K. miMmotoi were markedly influenced by both temperature (P=0.013) and irradiance (P=0.003), resulting in different growth characteristics olD. salina in filtrate mediums. Compared with the plateau period, K. mikimotoi exudates in the exponential phase had a stronger short-term inhibition effect on D. salina in normal conditions. A clear concentration-dependent relationship was observed in the effect of allelochemicals released from K. mikimotoi with low-promoting and high-repressing effects on D. Salina in a short time-scale. In addition, allelopathic substances remain stable and effective under high temperature and pressure stress. Many flocculent sediments adhering with D. salina cells were observed in all filtrate mediums, while the quantity and color depended on the original culture conditions. 展开更多
关键词 ALLELOPATHY Karenia mikimotoi dunaliella salina bi-algal culture cell-free filtrate
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Characterization of the Growth,Chlorophyll Content and Lipid Accumulation in a Marine Microalgae Dunaliella tertiolecta under Different Nitrogen to Phosphorus Ratios 被引量:3
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作者 SONG Donghui XI Bo SUN Jing 《Journal of Ocean University of China》 SCIE CAS 2016年第1期124-130,共7页
Microalgal lipids are regarded as main future feedstock of biofuels for its higher efficiency of accumulation and sus- tainable production. In order to investigate the effect of various nitrogen to phosphorus ratios o... Microalgal lipids are regarded as main future feedstock of biofuels for its higher efficiency of accumulation and sus- tainable production. In order to investigate the effect of various nitrogen to phosphorus ratios on cells growth, chlorophyll content and accumulation of lipids in Dunaliella tertiolecta, experiments were carried out in modified microalgal medium with inorganic nitrogen (nitrate-nitrogen) or organic nitrogen (urea-nitrogen) as the sole nitrogen source at initial N:P ratios ranging from 1:1 to 32:1. The favorable N:P of 16:1 in the nitrate-N or urea-N medium yielded the maximum cell density and specific growth rate. Decrease in chlorophyll content were observed at the N:P of 4:1 in both nitrate-N and urea-N cultures. It was also observed that the maximum lipids concentration was obtained at the N:P of 4:1 in both nitrate and urea nutrient medium. The lipid productivity and lipid content of cultures in the urea-N medium at the N:P of 4: lwere markedly higher than those from cultures with other N:P ratios (p〈 0.05). The results of this work illustrate the possibility that higher ratios of nitrogen to phosphorus have enhancing effect on cells growth of D. tertiolecta. Conversely, higher lipid accumulation is associated with a decrease in chlorophyll content under lower ratios of nitro- gen to phosphorus. The results confirm the hypothesis of this study that a larger metabolic flux has been channeled to lipid accumu- lation in D. tertiolecta cells when the ratios of nitrogen to phosphorus drop below a critical level. 展开更多
关键词 dunaliella tertiolecta lipid accumulation ratios of nitrogen and phosphorus concentration
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根据β—胡萝卜素合成机制改进盐生杜氏藻(Dunaliella salina)培养方法的研究 被引量:4
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作者 孙福璋 《烟台大学学报(自然科学与工程版)》 CAS 1992年第1期119-125,共7页
根据β-胡萝卜素合成机制,在盐生杜氏藻(Dunaliella Salina)的培养过程中适当加入柠檬酸,Mg^(2+)和间断通CO_2可以提高盐生杜氏藻体内β—胡萝卜素的含量,其含量可达10.2%.
关键词 盐生杜氏藻 Β-胡萝卜素 培养
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