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1.
刘镜恪 《中国海洋湖沼学报》1998,(2)
ImODUCTIONStudiesonthenutritionmpuirementSoffishlarvaehavernadesomeprognaabroad,butwearenotawareofreportSonsuchstudiesinChinanow.ltwasdeter-Annedanhythatn-3HU-FA,espedally22f6(n-3)roHA)and2O5(n-3)(EPA)ises-sentialformarinefishlarvaegroWth.ThehighcontentofDHAinmarinefisheggSandthel0wcontent0fDHAinArtrmiashowthatArthetaasliwfndcandsaoothen-3HUFAreq~dmendfishlacae.bosdenistSdriitaln-3HUFAenriedArbotabyboingthemn-3HUFAcontainingbogtanulataldietS,etC.Watanabe,T.(l983)enri~livefe… 相似文献
2.
Illuminating conditions are crucial factors affecting the microalgal growth and biosynthesis.The effects of illuminating spectral quality on the growth and bio-component production of Nannochloris oculata were investigated.The results indicated that a high proportion of Red-light enhanced the pigments and carbohydrate production but reduced those of the biomass and lipid.Mono-chromatic Blue-light has advantageous effects on lipid production compared with Red-and White-light.The optimal light spectrum for the protein production was the combination of Red-and Blue-light at a ratio of 4:3 or 5:2.Among the seven fatty acids identified from N.oculata,the contents of C16:0,C18:0,and C18:3(n-3)in the lipid were inhibited by the increased proportion of Red-light while those of C18:2(n-9),C16:2(n-6),and C20:0 were inhibited by Blue-light.Monochromatic Red-and Blue-light and their com-binations were proposed as a promising illuminating strategy for the large-scale cultivation aiming for various bio-components. 相似文献
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通过对大花细辛(Asarummaximum Hemsl)挥发油化学成分研究,探讨其保健和药用机理,为开发和利用大花细辛提供科学依据。用无水乙醇对大花细辛进行提取,并用GC-MS对提取物进行化学成分和相对含量分析共获得86种化合物,其中主要的并具研究价值的有33种,占总化合物的92.68%。其中5-甲基-1,2,3-三甲氧基苯(C10H14O3)的相对含量最高,为23.00%;其次为2-甲氧基-4-乙烯基苯酚(C9H10O2),为10.54%。 相似文献
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Toxic hexavalent chromium reduction by Bacillus pumilis,Cellulosimicrobium cellulans and Exiguobacterium 总被引：1，自引：0，他引：1
Three bacterial strains B acillus pumilis,Cellulosimicrobium cellulans and Exiguobacterium were investigated when grown in Luria-Bertani(LB) medium at 500 μg/m L Cr(VI). The hexavalent chromium reduction was measured by growing the strains in De Leo and Ehrlich(1994) medium at 200 and 400 μg/m L K 2 Cr O 4. The optimal Cr(VI) reduction by strains B. pumilis,Exigubacterium and C. cellulans was 51%,39%,and 41%,respectively,at an initial K2 Cr O 4 concentration of 200 μg/m L at p H 3 and temperature 37°C. At an initial chromate concentration of 400 μg/m L,the Cr(VI) reduction by strains B. pumilis,Exigubacterium and C. cellulans was 24%,19%,and 18%,respectively at p H 3 at 37°C after 24 h. These strains have ability to reduce toxic hexavalent chromium to the less mobile trivalent chromium at a wide range of different environmental conditions and can be useful for the treatment of contaminated wastewater and soils. 相似文献
5.
LI Mingzhu MAI Kangsen AI Qinghui HE Gen XU Wei ZHANG Wenbing ZHANG Yanjiao ZHOU Huihui LIUFU Zhiguo 《中国海洋大学学报(英文版)》2015,(2):317-324
This study investigated the effect of dietary lipid on the growth, fatty acid composition and Δ5 fatty acyl desaturase genes(Fads) expression of juvenile abalone(Haliotis discus hannai Ino) hepatopancreas. Six purified diets were formulated to contain tripalmitin(TP), olive oil(OO, 72.87% 18:1n-9), grape seed oil(GO, 68.67% 18:2n-6), linseed oil(LO, 70.48% 18:3n-3), ARA oil(AO, 41.81% ARA) or EPA oil(EO, 44.09% EPA and 23.67% DAH). No significant difference in survival rate was observed among abalone fed with different diets. Weight gain rate(WGR) and daily growth rate of shell length(DGRSL) were significantly increased in abalone fed with diets containing OO, AO and EO, but decreased in abalone fed with LO diet(P 0.05) in comparison with those fed with TP. High level of dietary 18:2n-6 resulted in higher content of n-6 polyunsaturated fatty acids(PUFAs) in abalone fed with GO than those fed with TP, OO, LO and EO(P 0.05). n-3 PUFAs in abalone fed with LO was significantly higher than those in abalone fed with TP, OO, GO and AO(P 0.05). The highest contents of 20:1n-9 and 22:1n-9 were observed in abalone fed with OO. The expression of Δ5 Fads in hepatopancreas of abalone was enhanced by high concentration of 18:3n-3 and suppressed by dietary LC-PUFAs; however it was not affected by dietary high concentration of 18:1n-9 or 18:2n-6. These results provided valuable information for understanding the synthesis of LC-PUFAs and nutritional regulation of Δ5 Fads expression in abalone. 相似文献
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Acid hydrolysis is a simple and direct way to hydrolyze polysaccharides in biomass into fermentable sugars. To produce fermentable sugars effectively and economically for fuel ethanol, we have investigated the hydrolysis of Enteromorpha using acids that are typically used to hydrolyze biomass:H2SO4, HCl, H3PO4 and C4H4O4 (maleic acid). 5%(w/w) Enteromorpha biomass was treated for different times (30, 60, and 90 min) and with different acid concentrations (0.6, 1.0, 1.4, 1.8, and 2.2%, w/w) at 121°C. H2SO4 was the most effective acid in this experiment. We then analyzed the hydrolysis process in H2SO4 in detail using high performance liquid chromatography. At a sulfuric acid concentration of 1.8% and treatment time of 60 min, the yield of ethanol fermentable sugars (glucose and xylose) was high, (230.5 mg/g dry biomass, comprising 175.2 mg/g glucose and 55.3 mg/g xylose), with 48.6% of total reducing sugars being ethanol fermentable. Therefore, Enteromorpha could be a good candidate for production of fuel ethanol. In future work, the effects of temperature and biomass concentration on hydrolysis, and also the fermentation of the hydrolysates to ethanol fuel should be focused on. 相似文献
7.
西施舌生长的研究 总被引：1，自引：0，他引：1
于 1998年 11月至 2 0 0 2年 12月 ,在福建长乐对西施舌 (Coelemactraantiguata)的生物学特征进行测定 ,以人工养殖方法观察其周年生长情况。观测结果表明 ,长乐沿海西施舌的群体组成以体长 6 1～ 110mm占优势 ,其频率 ( fn)为 0 .14 0～ 0 .2 2 2～ 0 .12 5。不同大小的西施舌 ,软体部肥满度指数 (CI)具有明显的季节差异。 1龄西施舌月平均体长增长 4 .0 5mm ;2龄的为 2 .31mm ;3龄的为 1.83mm ;1～ 3龄为成体生长发育阶段 ,3龄之后趋向衰老。不同发育生长阶段的壳高与壳长直线回归关系 :幼虫期H =0 .994L - 13.0 7;稚贝期H =0 .90 5L - 4.76 ;幼贝期H =0 .0 14 +0 .82 4L ;成贝期H =0 .36 7+0 .72 4L。 相似文献
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改进重铬酸钾法快速测定水样CODcr 总被引：7，自引：0，他引：7
研究了用硫酸锰代替贵金属硫酸银作催化剂,在H2SO4-H3PO4介质中,重铬酸钾回流法测定水样中CODcr的新方法.通过实验,确定了最佳测定条件:MnSO4浓度为1×10-1mol.L-1;混酸溶液(H2SO4:H3PO4)=5:1(体积比);回流时间10min.并与标准方法进行了对比,准确度和精密度同标准法相近,大大节约了分析时间. 相似文献
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二次离子质谱(SIMS)技术近年来被广泛用于分析煤和油气烃源岩有机组分化学成分和结构特征.在介绍SIMS质谱图解析方法的基础上,分析了有机组分二次离子组成特征;在综合研究有机组分SIMS质谱图特征的基础上,应用化学动力学原理对有机组分SIMS质谱裂解机理进行了探讨.结果表明:有机组分以芳香核为基本结构单元,且含有杂环并带有多种含氧基团和支链;有机组分SIMS质谱裂解由其复杂大分子结构中烷基苯不同化学键的解离能大小决定的;有机质结构中α碳和β碳之间的α—p键和支链碳的C—C键解离能最弱,有机化学结构中的α-β键和支链碳的C—C键容易断裂;与苯环相连支链中,(C6 H5) CH2—C2H5结构中的α-β键和支链碳的C—C键容易断裂而形成(C6H5)CH2-(91)、C2H5-(29)和CH3-(15)等碎片离子,这也是有机组分SIMS质谱图中最主要的碎片离子峰. 相似文献
10.
《广东海洋大学学报》2016,(6)
对远东拟沙丁鱼(Sardinops sagax)蛋白进行蛋白酶解和膜分离,得到分子质量100~3 000 u(F1)、3 000~10 000 u(F2)和大于10 000 u(F3)的多肽组分。在生化水平上测定各组分对1,1-二苯基-2-三硝基苯肼(DPPH)、2,2-联氮-二(3-乙基-苯并噻唑-6-磺酸)二铵盐(ABTS)、羟基自由基和过氧自由基清除能力;在细胞水平上,以H2O2对Caco-2细胞的毒性及细胞内抗氧化体系的影响为检测指标,筛选最适浓度的H2O2建立细胞氧化应激模型;在建立该模型的基础上,进一步检测蛋白多肽F1对氧化应激损伤细胞的修复功能。结果表明:组分F1对DPPH、ABTS、羟基自由基和过氧自由基清除能力最强,清除率分别为56.03±0.14、86.26±0.32、38.34±1.70、54.85±0.75;100μmol/L的H2O2对细胞毒性作用较小,并可降低细胞中谷胱甘肽过氧化物酶(GSH-Px)、总抗氧化物歧化酶(T-SOD)、过氧化物酶(POD)的活性和谷胱甘肽(GSH)的含量,增加丙二醛(MDA)的含量,细胞氧化应激模型选择H2O2浓度为100μmol/L;在该模型条件下,F1对受损的Caco-2细胞中抗氧化体系中的GSH-Px、T-SOD、POD的活性和MDA、GSH的含量有一定恢复作用,可调节细胞中失衡的抗氧化体系。远东拟沙丁鱼多肽FI对细胞氧化应激受损有一定保护作用。 相似文献
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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
13.
Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
14.
《极地研究(英文版)》2014,(3)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献
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《山地科学学报》2014,(4):I0004-I0009
<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet. 相似文献
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《山地科学学报》2014,(4)
<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by 相似文献
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References： 《极地研究(英文版)》2007,18(1):73-83
Using the NCEP/NCAR reanalysis monthly 500 hPa height data on a 2.5 latitude-longitude grid and 1°×1° sea ice data,the polar vortex area,intensity index and arctic sea ice area index are calculated respectively,and the meridional distribution,period variation and the abrupts in the long range trend are analyzed to study their relationship.The results show that the meridional distribution of sea ice and polar vortex h-ave distinctive difference,the relative positions of them are different in the eastern and western hemispheres,and exept they have periods of 4 months,quasi half year,quasi year,4-5 years and 10 years commonly,and each of them has its own respective variation as well.The sea ice area is decreasing apparently since 1980's,so is the polar vortex area,but their abrupt changge time are different totally.The area of sea ice and polar vortex has prominent positive correlation,but the relationship of sea ice intensity,polar vortex intensity,polar vortex area is complicated. 相似文献
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《中国海洋大学学报(英文版)》2014,(3):I0001-I0001
<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research 相似文献