荧蒽对两种海洋硅藻生长、SOD活力和MDA含量的影响   总被引：4，自引：0，他引：4  

王丽平  郑丙辉  孟伟 《海洋通报》2008,27(4)

采用静态实验方法研究了多环芳烃荧蒽对两种海洋硅藻的毒性作用.实验结果表明:荧蒽对中肋骨条藻(Skeletonema costatum)和三角褐指藻(Phaeodactylum tricornutum)的72 h EC50 值分别为:(18±2.9)μg/L和(103±9.1)μg/L;荧蒽的暴露浓度和胁迫时间对中肋骨条藻细胞的超氧化物歧化酶(SOD)没有明显影响;荧蒽暴露浓度对三角褐指藻细胞的SOD也没有明显影响,只在短期暴露时间内(36h)明显升高,而后又恢复至原始水平;荧蒽的暴露浓度和胁迫时间对两种海洋硅藻细胞的丙二醛(MDA)含量都有明显影响,表明荧蒽胁迫明显增强了两种海洋硅藻细胞的膜脂质过氧化作用,可能会对藻细胞膜的功能产生一定的影响.  相似文献   

坛紫菜胞质型抗坏血酸过氧化物酶基因的克隆及特征分析   总被引：2，自引：0，他引：2  

张晓龙  杨锐  仪茜茜  孙雪  吴晓微  王亚军 《海洋学报》2010,32(5):165-174

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Lipid Distribution in Marine Sediments from the Northern South China Sea and Association with Gas Hydrate     

OU Wenji  LEI Huaiyan  LU Wanjun  ZHANG Jie  SHI Chunxiao  GONG Chujun  HAN Chao 《《地质学报》英文版》2014,88(1):226-237

The distributions of lipids in surface and subsurface sediments from the northern South China Sea were determined. The n-alkanes were in bimodal distribution that is characterized by a centre at n-C16 –n-C20 with maximum at C18(or C19) and n-C27 –n-C31 as well as at C29(or C31). The short-chain alkanes suffered from significant losses due to their slow deposition in the water column, and their presence with a slight even carbon predominance in shallow seafloor sediments was ascribed mainly to the direct input from the benthos. The long-chain alkanes with odd predominance indicate transportion of terrigenous organic matter. Immature hopanoid biomarkers reflect the intense microbial activity for bacteria–derived organic matter and the gradual increase of maturity with burial depth. Abundant n-fatty acid methyl esters(n-FAMEs) that are in distributions coincident with fatty acids were detected in all samples. We proposed that the observed FAMEs originated from the methyl esterification of fatty acids; methanol production by methanotrophs and methanogenic archaea related to the anaerobic oxidation of methane, and sulfate reduction provided an O–methyl donor for methylation of fatty acids. The CH4 released from hydrate dissociation at oxygen isotope stage II of Cores ZD3 and ZS5, which had been confirmed by the occurrence of negative δ13C excursion and spherical pyrite aggregates, could have accelerated the above process and thus maximized the relative content of FAMEs at ZD3-2(400–420 cm depth) and ZS5-2(241–291 cm depth).  相似文献   

基于脂质组学的蛭龙活血通瘀胶囊抗动脉粥样硬化作用机制研究          下载免费PDF全文

张娟  汤润  任维 《应用海洋学学报》2021,37(12):164

目的：基于脂质组学观察蛭龙活血通瘀胶囊抗动脉粥样硬化的作用机制。方法：将34只大鼠分为空白组、模型组、给药组,通过大鼠一次性腹腔注射维生素D₃联合高脂饲料建立大鼠动脉粥样硬化模型。测定各组大鼠血脂［总胆固醇(TC)、三酰甘油（TG）、低密度脂蛋白、高密度脂蛋白（HDL-C）］水平,观察各组主动脉的病理变化,采用UPLC-Orbitrap MS 技术对各组血浆样本进行脂质组学研究。结果：与空白组相比,模型组TC、TG、LDL-C水平升高,差异具有统计学意义（P<0.05或P<0.01）;与模型组相比,给药组 TC、TG、LDL-C水平降低,差异具有统计学意义（P<0.01）。组织病理学显示,给药组脂质沉积减少,主动脉内膜增厚改善。鉴定出脂质亚类29种,其脂质分子 959种。给药组与模型组差异脂质分子62种,主要差异代谢物为甘油磷脂、鞘脂及甘油酯类。在3组差异代谢物中,筛选出符合给药组趋势与模型组相反的差异性代谢物22种。结论：蛭龙活血通瘀胶囊可降低血脂及改善动脉粥样硬化,其主要作用通路为甘油磷脂代谢及甘油酯代谢。  相似文献   

栉孔扇贝(Chlamys farreri)过氧化物酶体增殖物激活受体基因的鉴定与表达分析     

隋明益  杨祖晶  于海涛  彭程  邢强  黄晓婷  胡景杰  包振民 《海洋与湖沼》2021,52(1):153-161

过氧化物酶体增殖物激活受体(peroxisome-proliferator-activated receptors,PPARs)是核激素受体超家族成员,在脂肪代谢过程中发挥重要的调控作用,目前贝类过氧化物酶体增殖物激活受体仍未见报道。本文利用已发表的栉孔扇贝(Chlamys farreri)基因组和转录组,获得其PPAR基因,命名为CfPPAR-like,基因开放阅读框全长1572 bp,编码486个氨基酸,预测蛋白质分子量MW为54305.3 Da,等电点pI为8.3,二、三级结构以转角和卷曲为主,无信号肽和跨膜区域,属于胞内蛋白。与脊椎动物PPARs蛋白序列比对表明CfPPAR-like包含DBD和LDB结构域,其中DBD区域保守性较高,而LBD的保守性较低。进化分析显示,栉孔扇贝等软体动物的PPARs聚为单独一支,仿刺参等棘皮动物的PPARs聚为单独一支,果蝇和线虫的PPARs基因同源物在进化树的最外端,脊椎动物的三种PPARs亚型分别聚类后,再与无脊椎动物PPARs聚类,结果支持核激素受体超家族在脊椎动物进化早期出现了各亚型这一假说。CfPPAR-like在幼虫发育过程中呈现普遍性表达,暗示其参与扇贝幼虫早期的分裂,贝壳的形成以及幼贝的变态过程;在成体各组织中,CfPPAR-like在栉孔扇贝的性腺、肾脏以及消化腺中表达量较高,表明其参与扇贝性腺分化、脂肪代谢等过程的调控。研究结果对于揭示贝类脂质代谢调控机制以及优良扇贝品种的培育具有重要意义。  相似文献   

多氯联苯(PCB1254)对栉孔扇贝消化盲囊和鳃丝抗氧化系统及脂质过氧化水平的影响     

任加云  刘娟娟  于祥  李建庆 《海洋湖沼通报》2011,(3):149-156

本实验研究了浓度梯度为0.5,1.0,和10.0μg/L的多氯联苯化舍物(PCB1254)处理30d栉孔扇贝消化盲囊和鳃丝SOD,CAT和GPx活性和脂质过氧化水平的变化.研究结果表明:低浓度组(0.5μg/L和1.0μg/L)的抗氧化酶活力能够被PCB1254显著的诱导,但是在高浓度组,抗氧化酶快速被诱导升高然后随着...  相似文献   

甘蔗品种性状与过氧化物酶同工酶的关系     

杨文  邝雪梅  程剑平  黄银姬  张允寅 《广东海洋大学学报》1999,(1)

以３０个甘蔗栽培品种为材料，用垂直平板聚丙烯酰胺凝胶电泳方法，对过氧化物酶同工酶进行分析，统计比较各酶带出现的频率与甘蔗主要性状的关系．结果表明：Ａ６、Ｂ３酶带同时出现时１００％为高糖品种，因此Ａ５、Ｂ３酶带与高糖性状关系极为密切；Ａ６、Ａ８、Ｂ３、Ｂ７酶带单独存在时也与高糖性状有关；早熟种与Ａ５、Ｂ３、Ｂ７酶带的存在有关；中小茎种和中茎种分别与Ａ４、Ｂ５酶带的存在有关。  相似文献   

龙须菜果孢子的紫外诱变及优势突变体的筛选     

付峰  隋正红  常连鹏  周伟  魏惠惠 《中国海洋大学学报(自然科学版)》2014,44(3)

用紫外线辐射处理野生型龙须菜果孢子体放散刚附着的果孢子,并通过耐高温的筛选,初步获得了2株具有耐高温,生长快速等优良性状的四分孢子体突变株,命名为BZT-11和BZT-18,将其与981和野生型藻株进行了比较分析。结果显示,这2株突变体在实验室内和海上的日平均生长速率为均明显高于981和野生型藻株。在热胁迫时间内,BZT-11和BZT-18的丙二醛(MDA)含量均明显低于野生型,超氧化物歧化酶(SOD)活性明显高于野生型;而在整个胁迫过程中2株突变体与981藻株的MDA含量和SOD活性水平差异不显著。经过4h的热激后,藻株BZT-11和BZT-18的hsp70基因表达水平也显著高于野生型。这些结果进一步证明了该2株突变藻体的耐高温优势。本研究提供了耐高温突变体的筛选技术。  相似文献   

Acute toxicity of organochlorine insecticide endosulfan to the giant freshwater prawn Macrobrochium rosenbergii     

戴习林  熊昭娣  谢剑  丁福江 《中国海洋湖沼学报》2014,32(1):111-119

Endosulfan, an organochlorine pesticide, is highly toxic and effective at controlling pests in agriculture, horticulture, and public health programs. In this study, static bioassays were used to evaluate the toxicity of endosulfan to freshwater prawns( Macrobrachium rosenbergii) of various lengths(1.5±0.03,4±0.08, and 7±0.06 cm). Additionally, the activities of peroxidase(POD), acid phosphatase(ACP),alkaline phosphatase, acetylcholinesterase(AChE), and Na + /K +-ATPase were analyzed to refl ect the effects of endosulfan exposure. The 96 h LC 50 of endosulfan for prawns 1.5, 4, and 7 cm long were 1.86, 4.53,and 6.09μg/L, respectively, improved tolerance to endosulfan with growth. The POD activities of test organisms exposed to low concentrations of endosulfan were inhibited, indicating the presence of oxygen damaged tissue. Moreover, a notable decrease in AChE activity was observed due to overstimulation of neurotransmission, which might result in abnormal behavior. The effect caused by endosulfan on phosphatase production in the hepatopancreas of prawns 1.5, 4, and 7 cm long was different because the ability of nonspecifi c immune regulation increased with growth. The 96 h LC 50 values obtained in this study could be used in the formulation of water-quality criteria in China. Moreover, the changes in enzymes activities of M. rosenbergii under stress of endosulfan could be applied in the establishment of early warning indicators for bio-safety.  相似文献   

Effect of Fe3+ on the growth and lipid content of Isochrysis galbana     

刘志媛  王广策 《中国海洋湖沼学报》2014,32(1):47-53

Inducing lipid accumulation in microalgae cells without suppressing cell growth is vital to the economical production of biodiesel from microalgae. In two experiments, we demonstrate that the cell concentration and lipid content of marine microalgae Isochrysis galbana depend upon the iron concentration in the growth media. In Experiment I, adding chelated FeCl 3 to the medium at the late exponential growth phase prolonged this phase and increased the lipid content in I. galbana cells. The fi nal cell density and lipid content of I. galbana supplemented with chelated FeCl 3 was approximately 2 and 1.65 times higher than that of non-supplemented cultures, respectively. In Experiment II, I. galbana cells in the late exponential phase were collected and re-inoculated into new media containing Fe 3+ at various concentrations. The fi nal cell concentration and lipid content were maximized at the highest iron concentration(38% biomass by dry weight at 1.2×10-5 mol/L Fe 3+). In this study, intracellular neutral lipid storage was evaluated by fl uorescent spectrophotometry using fl uorochrome Nile red, and the measurement conditions were optimized.  相似文献