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Review and Comprehensive Analysis of Composition and Origin of High Acidity Crude Oils 被引量:1
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作者 Cai Xinheng Tian Songbai (Research Institute of Petroleum Processing,SINOPEC,Beijing 100083,China) 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2011年第1期6-15,共10页
High acidity crude oils have an advantage over normal oils in terms of their price,but can cause corrosion and refinery problems.They are the so-called opportunity crudes and likely to be important reserved resources ... High acidity crude oils have an advantage over normal oils in terms of their price,but can cause corrosion and refinery problems.They are the so-called opportunity crudes and likely to be important reserved resources in the 21st century.Researches on high acidity crude oils are becoming more and more profound.Based on the existing research achievements,this article has given an overview of the chemical composition and acid distribution of high acidity oils,and also analyzed their origin types and potential influence factors. 展开更多
关键词 high acidity oils total acid number acid composition ORIGIN influence factors
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Vanadium(Ⅳ)solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with[Cl^(-)]present:an experimental and theoretical study 被引量:1
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作者 Hong Liu Yi-Min Zhang +1 位作者 Jing Huang Tao Liu 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2023年第1期56-67,共12页
Separation of vanadium from black shale leaching solution at low pH is very meaningful,which can effectively avoid the generation of alkali neutralization slag and the resulting vanadium loss.In this study,coordinatio... Separation of vanadium from black shale leaching solution at low pH is very meaningful,which can effectively avoid the generation of alkali neutralization slag and the resulting vanadium loss.In this study,coordination mechanism of vanadium in acid leaching solution at low pH was investigated with the intervention of chloride ions.Under the conditions of pH 0.8,di-(2-ethylhexyl)phosphoric acid concentration of 20%,phase ratio of 1:2,and extraction time of 8 min,the vanadium extraction could reach 80.00%.The Fourier transform infrared and electrospray ionization results reveal that,despite the fact that the chloride ion in the leachate could significantly promote vanadium extraction,the chloride ion does not enter the organic phase,indicating an intriguing phenomenon.Among Cl^(-)-V,SO_(4)^(2-)-V,and H_(2)O-V,the V-Cl bond is longer and the potential difference between coordinate ions and vanadium is smaller.Therefore,Vo^(2+)gets easily desorbed with chloride ions and enter the organic phase.At the same time,the hydrogen ions of di-(2-ethylhexyl)phosphoric acid also enter the water phase more easily,which reduces the pH required for the extraction reaction. 展开更多
关键词 VANADIUM black shale solvent extraction high acidity extraction
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Preparation of high acidity coefficient slag wool fiber with blast furnace slag and modifying agents
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作者 Wen-chao He Ming-shuai Luo +6 位作者 Yin Deng Yue-lin Qin Shuo Zhang Xue-wei Lv Yong Zhao Cheng-zhe Jiang Zheng-de Pang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第7期1440-1450,共11页
Preparation of high acidity coefficient slag wool fiber with molten slag and modifying agents is considered to be a positive approach for value-added utilization of blast furnace slag. In order to achieve the multi-pu... Preparation of high acidity coefficient slag wool fiber with molten slag and modifying agents is considered to be a positive approach for value-added utilization of blast furnace slag. In order to achieve the multi-purposes of fiber-forming, energy saving, and waste heat recovery, the modifying agents that can improve the acidity coefficient of slag effectively, economically, and environmentally were investigated. Three agents with different acidity coefficients were adopted to modify slag and manufacture wool fibers. The effect of agent and slag proportion on the melting temperature and viscosity of molten slag was studied at a fixed acidity coefficient of 1.8 and 2.0. The results indicate that the sample modified with high acidity coefficient agent and high slag proportion has lower melting temperature and viscosity. The effect of agent and slag temperature on the fiber diameter was also investigated when the acidity coefficient of slag is 2.0. At a fixed slag proportion of 50 wt.%, the mean diameter decreases with increasing temperature and decreasing viscosity coefficient. Besides, the temperature drops caused by the addition of agents and energy consumption of samples for heating the slag were also analyzed. 展开更多
关键词 Blast furnace slag Slag wool fiber high acidity coefficient Modifying agent Slag proportion
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Leaching behavior of metals from limonitic laterite ore by high pressure acid leaching 被引量:14
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作者 郭学益 石文堂 +1 位作者 李栋 田庆华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第1期191-195,共5页
The leaching behavior of metals from a nickeliferous limonitic laterite ore was investigated by high pressure acid leaching process for the extraction of nickel and cobalt.The effects of sulfuric acid added,leaching t... The leaching behavior of metals from a nickeliferous limonitic laterite ore was investigated by high pressure acid leaching process for the extraction of nickel and cobalt.The effects of sulfuric acid added,leaching temperature,leaching time and liquid/solid(L/S) ratio on metals extraction were examined.More than 97% Ni,96% Co,93% Mn,95% Mg and less than 1% Fe are extracted under optimum conditions.Analysis of the high pressure acid leaching residue by chemical and XRD analysis indicates that the residual iron and sulfur are mainly present in phases of hematite and alunite,respectively.The high pressure leaching process provides a simple and efficient way for the high recovery of nickel and cobalt from laterite ore,leaving residue as a suitable iron resource. 展开更多
关键词 high pressure acid leaching limonitic laterite leaching behavior NICKEL
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Novel multi–SO_(3)H functionalized ionic liquids as highly efficient catalyst for synthesis of biodiesel 被引量:1
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作者 Meichen Li Jie Chen +3 位作者 Ling Li Changshen Ye Xiaocheng Lin Ting Qiu 《Green Energy & Environment》 SCIE CSCD 2021年第2期271-282,共12页
Biodiesel is an attractive alternative to fossil fuels due to the energy and environmental concerns. In this paper, seven different multi –SO_(3)H functionalized ILs based on the low-cost less-substituted amines, whi... Biodiesel is an attractive alternative to fossil fuels due to the energy and environmental concerns. In this paper, seven different multi –SO_(3)H functionalized ILs based on the low-cost less-substituted amines, which contained massive sites for functionalization of sulfonic acid groups and further treatment of sulfonate-based anions, were prepared as catalysts with high acidity and desirable catalytic activity for the synthesis of biodiesel from the esterification of oleic acid with methanol. The physicochemical properties of these acidic ILs were characterized by a variety of analytical techniques such as FT-IR, EA, TGA, and the Br?nsted acidity was well determined by UV–vis. Among the ILs prepared, [EDA-PS][P-TSA] showed the highest catalytic activity for esterification due to its high acidity and appropriate miscibility with reactants, with an ultrahigh97.58% conversion of oleic acid under the optimum conditions(i.e. reaction time, 1.8 h;catalyst amount, 3 wt%;alcohol/acid molar ratio, 13:1,temperature 70℃) acquired from the Box–Behnken response surface methodology. With the novel strategy of multi –SO_(3) H modification on ILs,our catalyst had an approaching or even superior oleic acid conversion rate compared to other reported catalysts with considerably lower catalyst dosage and shorter reaction time. More importantly, it also exhibited high generality for converting various FFA feedstocks into biodiesel with considerable conversion within 93.59–94.33% under a rather lower catalyst dosage, which showed the valuable potential for converting low-cost oils into biodiesel from an economic and environmental perspective. 展开更多
关键词 Multi–SO_(3)H functionalized IL high acidity ESTERIFICATION BIODIESEL
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Thermal Treatment for Decreasing the Acidity of Crude Oil
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作者 申海平 王玉章 李锐 《Petroleum Science》 SCIE CAS CSCD 2004年第3期78-81,96,共5页
Highly acidic crude oil is thermally soaked to investigate how the temperature and time involved affect the removal of organic acid in feedstock. Experimental results indicate that thermal treatment is an effective a... Highly acidic crude oil is thermally soaked to investigate how the temperature and time involved affect the removal of organic acid in feedstock. Experimental results indicate that thermal treatment is an effective approach to decreasing acidity and the acid removal rate reaches 80%. Temperature is one of the main factors that determine the acid removal reaction. When the temperature ranges from 420oC to 440oC, the acid removal rate increases with the rise of the reaction temperature, but the increase slows down gradually. At the reaction temperature below 440oC, the long reaction time favors the acid removal. The cracking and polymerization of hydrocarbon molecules take place so that the properties of the crude oil change at the same time when the highly acidic crude is thermally treated. 展开更多
关键词 highly acidic crude naphthenic acid acid removal thermal treatment VISBREAKING
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Improvement of three popular Indian groundnut varieties for foliar disease resistance and high oleic acid using SSR markers and SNP array in marker-assisted backcrossing 被引量:1
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作者 Yaduru Shasidhar Murali T.Variath +10 位作者 Manish K.Vishwakarma Surendra S.Manohar Sunil S.Gangurde Manda Sriswathi Hari Kishan Sudini Keshavji L.Dobariya Sandip K.Bera Thankappan Radhakrishnan Manish K.Pandey Pasupuleti Janila Rajeev K.Varshney 《The Crop Journal》 SCIE CAS CSCD 2020年第1期1-15,共15页
Foliar fungal diseases(rust and late leaf spot)incur large yield losses,in addition to the deterioration of fodder quality in groundnut worldwide.High oleic acid has emerged as a key market trait in groundnut,as it in... Foliar fungal diseases(rust and late leaf spot)incur large yield losses,in addition to the deterioration of fodder quality in groundnut worldwide.High oleic acid has emerged as a key market trait in groundnut,as it increases the shelf life of the produce/products in addition to providing health benefits to consumers.Marker-assisted backcrossing(MABC)is the most successful approach to introgressing or pyramiding one or more traits using traitlinked markers.We used MABC to improve three popular Indian cultivars(GJG 9,GG 20,and GJGHPS 1)for foliar disease resistance(FDR)and high oleic acid content.A total of 22 BC3F4 and 30 BC2F4 introgression lines(ILs)for FDR and 46 BC3F4 and 41 BC2F4 ILs for high oleic acid were developed.Recurrent parent genome analysis using the 58 K Axiom_Arachis array identified several lines showing upto 94%of genome recovery among second and third backcross progenies.Phenotyping of these ILs revealed FDR scores comparable to the resistant parent,GPBD 4,and ILs with high(~80%)oleic acid in addition to high genome recovery.These ILs provide further opportunities for pyramiding FDR and high oleic acid in all three genetic backgrounds as well as for conducting multi-location yield trials for further evaluation and release for cultivation in target regions of India. 展开更多
关键词 Foliar disease resistance high oleic acid Late leaf spot Marker-assisted backcrossing SNP array Background genome recovery
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Novel efficient procedure for biodiesel synthesis from waste oils with high acid value using 1-sulfobutyl-3-methylimidazolium hydrosulfate ionic liquid as the catalyst 被引量:1
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作者 Shuanglan Hu Ying Li Wenyong Lou 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第10期1519-1523,共5页
Preparation of biodiesel from waste oils containing 72% of free fatty acids catalyzed by a novel Br?nsted acidic ionic liquid 1-sulfobutyl-3-methylimidazolium hydrosulfate([BHSO_3MIM][HSO_4]) was systematically invest... Preparation of biodiesel from waste oils containing 72% of free fatty acids catalyzed by a novel Br?nsted acidic ionic liquid 1-sulfobutyl-3-methylimidazolium hydrosulfate([BHSO_3MIM][HSO_4]) was systematically investigated.The optimum molar ratio of methanol to waste oils,catalyst amount,reaction temperature and reaction time were 8/1,10%(based on the mass of waste oils),140°C and 6 h,respectively,under which the obtained yield of biodiesel reached 94.9%.Also,[BHSO_3MIM][HSO_4] as a catalyst still retained around 97% of its original catalytic activity after successive re-use of 5 batches(6 h per batch),showing the excellent operational stability.Moreover,the acidic IL [BHSO_3MIM][HSO_4] was able to ef ficiently catalyze conversions of waste oils with different amounts of FFAs(free fatty acids) into biodiesel,and showed tremendous application potential.Therefore,an ef ficient and environmentally friendly catalyst is provided for the synthesis of biodiesel from waste oils with high acid value. 展开更多
关键词 1-Sulfobutyl-3-methylimidazolium hydrosulfate Biodiesel Waste oils with high acid value Catalyst
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Development Prospect and Strategies of High Oleic Acid Rapeseed in Hengyang City
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作者 黄益国 李小芳 +1 位作者 李倩 雷利琴 《Agricultural Science & Technology》 CAS 2016年第4期1012-1014,共3页
On basis of characteristics and use way of high oleic acid rapeseeds, the research detailed significance in developing high oleic acid industry and performed analysis on relationship between research progress and deve... On basis of characteristics and use way of high oleic acid rapeseeds, the research detailed significance in developing high oleic acid industry and performed analysis on relationship between research progress and development status at home and abroad, as well as natural conditions, industry basis and development potential in Hengyang. The research concluded that Hengyang takes advantages in developing high oleic acid industry and proposed development suggestions and countermeasures in Hengyang. 展开更多
关键词 high oleic acid rapeseed Industry development Hengyang City
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Highly Sensitive Detection of Deoxyribonucleic Acid Hybridization Using Au-Gated AlInN/GaN High Electron Mobility Transistor-Based Sensors
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作者 Xiang-Mi Zhan Mei-Lan Ha +7 位作者 Quan Wang Wei Li Hong-Ling Xiao Chun Feng Li-Juan Jiang Cui-Mei Wang Xiao-Liang Wang Zhan-Guo Wang 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第4期75-78,共4页
Gallium nitride- (GaN) based high electron mobility transistors (HEMTs) provide a good platform for biological detection. In this work, both Au-gated AlInN/GaN HEMT and AlGaN/GaN HEMT biosensors are fabricated for... Gallium nitride- (GaN) based high electron mobility transistors (HEMTs) provide a good platform for biological detection. In this work, both Au-gated AlInN/GaN HEMT and AlGaN/GaN HEMT biosensors are fabricated for the detection of deoxyribonucleic acid (DNA) hybridization. The Au-gated AIInN/GaN HEMT biosensor exhibits higher sensitivity in comparison with the AlGaN/GaN HEMT biosensor. For the former, the drain-source current (VDS = 0.5 V) shows a clear decrease of 69μA upon the introduction of 1μmolL^-1 (μM) complimentary DNA to the probe DNA at the sensor area, while for the latter it is only 38 μA. This current reduction is a notable indication of the hybridization. The high sensitivity can be attributed to the thinner barrier of the AlInN/GaN heterostructure, which makes the two-dimensional electron gas channel more susceptible to a slight change of the surface charge. 展开更多
关键词 GAN In highly Sensitive Detection of Deoxyribonucleic Acid Hybridization Using Au-Gated AlInN/GaN high Electron Mobility Transistor-Based Sensors
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OPTICALLY ACTIVE AMINO ACIDS WITH HIGHLY BRANCHED SIDE CHAIN (I) SYNTHESIS OF D- AND L- 2-AMINO-5,5-DIMETHYLHEXANOIC ACID AND 2-AMINO-6,6-DIMETHYLHEPTANOIC ACID
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《Chinese Chemical Letters》 SCIE CAS CSCD 1992年第4期237-238,共2页
The title compounds were prepared by the enzymatic resolution of the corresponding N-acetylated DL-amino acids methyl esters, which were obtained from t-butyl chloride via an 8-step synthesis.
关键词 AMINO-5 5-DIMETHYLHEXANOIC ACID AND 2-AMINO-6 6-DIMETHYLHEPTANOIC ACID AND L OPTICALLY ACTIVE AMINO ACIDS WITH highLY BRANCHED SIDE CHAIN SYNTHESIS OF D
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Effect of High Digestible Essential Amino Acids on Weight Gains and Carcass Compositions of Laying Hens
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作者 K. Soisuwan N. Chauychuwong 《Journal of Agricultural Science and Technology(A)》 2011年第8期1265-1268,共4页
The objective of this study was to evaluate the effect of high digestible essential amino acids (DEAA) on weight gains and carcass compositions of laying hens. Three hundred and sixty lsa Brown hens in five replicat... The objective of this study was to evaluate the effect of high digestible essential amino acids (DEAA) on weight gains and carcass compositions of laying hens. Three hundred and sixty lsa Brown hens in five replications per treatment (12 birds/replicate) were used. Six experimental diets which contained of treatment 1 (negative control) as the conventional layer diet are recommended by NRC (1994) while another dietary treatments; treatments 2 (positive control), 3, 4, 5 and 6 were formulated to meet 100%, 110%, 120%, 130% and 140% of Standard Ileal Digestible Lysine Levels (SIDLL) without crude protein minimum, while methionine (Met), threonine (Thre) and tryptophan (Tryp) as related by Ideal Protein Concept (IPC) which suggested by NRC (1994) and INRA (2004). However, metabolizable energy (ME), calcium and available phosphorus (Avai P) levels of all experimental diets were meet requirement as recommended by NRC (1994). The experiment was assigned in CRD and laying hens fed dietary treatments from 28 to 44 weeks of age and cage was the experimental unit (3 hens/cage). The result shown that percentages of thigh (TP), feet (FP), drumstick (DP), heart (HP), liver (LP) and gizzard (GP) were not affected by dietary treatment. However, weight gains (WG) and percentage of dressed weight (DWP), eviscerate weight (EWP) and breast (BP) were increased (P 〈 0.05) and abdominal fat was reduced (P 〈 0.05) when birds fad diets containing 130% of SIDLL as compared with control group and another dietary treatments, when increasing the DEAA levels upper to 130% of SIDLL. The result indicated that diets formulated without crude protein minimum and increased DEAA resulted in increasing the efficiency of converting metabolizable energy (ME) to net energy (NE) for increasing weight gain and improved meat products while fat deposition in carcass composition was reduced. 展开更多
关键词 high dietary digestible essential amino acids weight gain carcass composition laying hens
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High Performance Liquid Chromatographic Determination of Phenolic Acids in Fruits and Vegetables
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作者 LI PING, WANG Xu-QlNG, WANG HlJAI-ZHOU, AND WU YONG-NlNGInstitute of Nutrition and Food Hygiene, Chinese Academy of Preventive Medicine, 29 Nanwei Road, Beijing 100050, China 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 1993年第4期389-398,共10页
A simple isocratic HPLC technique has been developed for the quantitative analysis of phenolic acids (PAs) in fruits and vegetables. Nine benzoic and cinnamic acid derivatives were separated in less than 30 min, and t... A simple isocratic HPLC technique has been developed for the quantitative analysis of phenolic acids (PAs) in fruits and vegetables. Nine benzoic and cinnamic acid derivatives were separated in less than 30 min, and the resolution was all more than 1.23. The ranges of linearity for PAs standards were 0.2-100 ng, even up to 600 ng (r = 0.983-1.000) and the detection limits were 0.02-0.24 mg/kg. Samples of fresh vegetables and fruits were extracted with 80% mcthanol and ethyl acetate, then purified with C18 Sep-Pak cartridge and determined by HPLC. This method was applied to the determination of PAs in 7 kinds of fruits and vegetables, i.e., apple, pear, Chinese cabbage, cauliflower, turnip, soybean sprout and white grape wine. The content of the 9 PAs varied widely in the 7 kinds ol'foods studied. The average concentrations ofchlorogenic acid in apple (100.2 mg/kg) and pear (30.8 mg/kg) were quite high, and sinapinic acid was remarkable (42.5 mg/kg) in Chinese cabbage, and protocatechuic acid had the highest concentration of all the PAs in white wine. 展开更多
关键词 high Performance Liquid Chromatographic Determination of Phenolic Acids in Fruits and Vegetables
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BnGLO4 gene cloning and bioinformatics analysis in Brassica napus L
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作者 Xi Li Xiaodan Wang +5 位作者 Shijun Li Zechuan Peng Dongfang Zhao Bingqian Zhou Chunyun Guan Mei Guan 《Oil Crop Science》 CSCD 2023年第3期133-142,共10页
High oleic acid rapeseed oil offers superior nutritional and health benefits,but its mass production is limited due to poor resistance and slightly lower yield.Photosynthesis serves as the foundation of biological sur... High oleic acid rapeseed oil offers superior nutritional and health benefits,but its mass production is limited due to poor resistance and slightly lower yield.Photosynthesis serves as the foundation of biological survival and closely correlates with crop resistance to stresses,yield,and quality.To identify photosynthesis-related genes,transcriptome sequencing was conducted on high oleic acid rapeseed Gaoyousuan No.1 and low oleic acid rapeseed Xiangyou 15 resulting in the identification of a total of 9396 differentially expressed genes(4669 upregulated and 4727 down-regulated).From these genes nine candidate genes were screened using GO and KEGG analysis with BnGLO4 being selected for cloning purposes.The BnGLO4 gene fragment has a length of 1161 bp with an ORF sequence of 1092 bp encoding a theoretical isoelectric point of pI 7.60;it encodes an unstable lipid-soluble protein localized in peroxisomes without transmembrane structural domains or signal peptides.Its amino acid sequence homology was highest with that of BnaA01G0355200ZS,BnaA01G0355600ZS,BnaA05G0410400ZS,BnaC01G0441800ZS,and Brassica rapa(XP_009117145.1),Brassica napus(CDY39100.1),Brassica cretica(KAF3533604.1)and Brassica oleracea var.oleracea(XP_013610644.1)belonging to the same cruciferous family.The BnGLO4 gene may be associated with responses to abiotic stresses such as salt,drought,and temperature extremes along with photosynthesis and growth in rapeseed plants.The expression levels of the GLO4 gene(BnaA01G0355200 ZS)were highest in filaments while being higher at each stage in seeds and siliques with the highest expression level at day 14 in seeds.Expression was significantly upregulated after 3 h of salt stress treatment,reaching a maximum at 12 h before slightly decreasing at 24 h.The findings of this study lay a foundation for further investigation on photosynthesis and stress response in high oleic rapeseed. 展开更多
关键词 high oleic acid TRANSCRIPTOME Glycolate oxidase GLO4
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烘丝前后烟丝多元酸和高级脂肪酸变化研究 被引量:6
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作者 刘江生 李跃锋 +2 位作者 洪伟岭 姜焕元 陈河祥 《分析测试学报》 CAS CSCD 北大核心 2004年第z1期280-281,共2页
  烟草中的多元酸对抽吸品质有重要影响,它们能与生物碱结合成盐,调节烟草中碱性成分的挥发性.高级脂肪酸可分成饱和与不饱和两类,饱和脂肪酸能增加烟气的脂肪味、腊味并使之圆和;不饱和脂肪酸增加烟气的丰满度和粗糙感[1].……
关键词 DRYING GC - MS Nonvolatile organic acids high fatty acids
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Cloning of Cotton Delta-12 Oleate Desaturase Gene FAD2-1 and Construction of Its ihpRNA and amiRNA Interference Vectors 被引量:1
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作者 赵立群 李红岺 +3 位作者 李仁 李蔚 华金平 郭仰东 《Agricultural Science & Technology》 CAS 2012年第11期2281-2283,2286,共4页
Delta-12 oleate desaturase gene (FAD2-1) which converts oleic acid into linoleic acid, is the key enzyme determining the fatty acid composition of cottonseed oil. By employing RT-PCR method, full length cDNA of cott... Delta-12 oleate desaturase gene (FAD2-1) which converts oleic acid into linoleic acid, is the key enzyme determining the fatty acid composition of cottonseed oil. By employing RT-PCR method, full length cDNA of cotton delta-12 oleate desat- urase gene GhFAD2-1 containing an open reading frame of 1 158 bp was cloned for constructing RNAi vector. A 515 bp long specific fragment of this gene was se- lected for constructing ihpRNA vector under the control of a seed-specific promoter NAPIN, named pFGC1008-NAPIN-FAD2-1; meanwhile miRNA gene-silencing vector pCAMBIA1302-amiRNA-FAD2-1 targeting GhFAD2-1 was also constructed. 展开更多
关键词 Cotton delta-12 oleate desaturase gene GhFAD2-1 ihpRNA interferencevector amiRNA interference vector high oleic acid contents
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Growth Response and Fatty Acid Composition of Juvenile Procambarus clarkii Fed Different Sources of Dietary Lipid 被引量:11
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作者 WENXiao-bo KUYao-mei ZHOUKai-ya 《Agricultural Sciences in China》 CAS CSCD 2003年第5期583-590,共8页
An experiment was conducted to evaluate the effects of feeding various sources of dietary lipid on weight gain, feed conversion, survival and fatty acid composition of juvenile red swamp crawfish, Procam-barus clarkii... An experiment was conducted to evaluate the effects of feeding various sources of dietary lipid on weight gain, feed conversion, survival and fatty acid composition of juvenile red swamp crawfish, Procam-barus clarkii. Six semi-purified diets containing vitamin-free casein, defatted soybean meal, 0. 5% choline chloride, 0. 5% glycine and 0. 5% cholesterol were supplemented with 6. 0% of either anchovy oil, linseed oil, soybean oil, rapeseed oil, safflower oil or pork lard. Each diet was fed to crawfish (3. 07±0. 21 g average weight) in three replicate aquaria for 60 days. Survival rate, weight gain and feed conversion were best for crawfish fed the diet containing anchovy oil. Crawfish fed the linseed oil diet had the second highest weight gain, followed by crawfish on soybean oil, repaseed oil, safflower oil and pork lard diets, respectively. Feed conversion values were a reflection of weight gain. Results showed that both n-6 and n-3 fatty acids are dietary essential for juvenile Procambarus clarkii, although n-3 fatty acids promoted faster growth than n-6. However, highly unsaturated fatty acids (HUFA) (20 : 5n-3 and 22 :6n-3) had better growth-promoting effect than 18 : 3n-3, due probably to the limited ability of crawfish to bioconvert fatty acids to polyenoic forms of longer chain length. The fatty acid composition of the crawfish generally reflected that of the dietary lipids, especially for the diets containing unsaturated fatty acids. 展开更多
关键词 Procambarus clarkii Fatty acid composition Feed conversion highly unsaturated fatty acids Lipid sources Weight gain
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Effect of n-3 HUFA levels in rotifers and Artemia on growth and survival of larval black sea bream (Sparus macrocephalus) 被引量:1
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作者 刘镜恪 李岿然 +1 位作者 黄冰心 陈晓琳 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2004年第4期421-424,共4页
Requirement for dietary n-3 HUFA (n-3 highly unsaturated fatty acid) for growth and survival of black sea bream (Sparus macrocephalus) larvae was studied using rotifers and Artemia at various levels of n-3 HUFA. Five ... Requirement for dietary n-3 HUFA (n-3 highly unsaturated fatty acid) for growth and survival of black sea bream (Sparus macrocephalus) larvae was studied using rotifers and Artemia at various levels of n-3 HUFA. Five treatments with rotifers and Artemia differing in n-3 HUFA were prepared by enriching them with various oil emulsions. Results indicated that dietary n-3 HUFA significantly influence fish n-3 HUFA levels and are essential for growth and survival of black sea bream larvae. The results also indicated that the incorporation of n-3HUFA TG (triacylglycerols) into tissues of larval black sea bream was more effective from natural fish oil in comparison with n-3 HUFA fatty acid ethyl esters from ethyl-esterified oil. 展开更多
关键词 n-3 highly unsaturated fatty acids GROWTH SURVIVAL Sparus macrocephalus larvae
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Phosphonate-Decorated Covalent Organic Frameworks for Actinide Extraction: A Breakthrough Under Highly Acidic Conditions 被引量:5
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作者 Jipan Yu Liyong Yuan +11 位作者 Shuai Wang Jianhui Lan Lirong Zheng Chao Xu Jing Chen Lin Wang Zhiwei Huang Wuqing Tao Zhirong Liu Zhifang Chai John K.Gibson Weiqun Shi 《CCS Chemistry》 CAS 2019年第3期286-295,共10页
Although solid-phase extraction is a useful approach for metal ion separation from aqueous solutions,existing sorbents suffer from low extraction effici-encies and/or instability when in contact with strong acidic med... Although solid-phase extraction is a useful approach for metal ion separation from aqueous solutions,existing sorbents suffer from low extraction effici-encies and/or instability when in contact with strong acidic media.We report here the first study on rational design and fabrication of phosphonate-decorated covalent organic frameworks,COF-IHEP1 and COF-IHEP2,for efficient and selective extraction of of uranium(VI)[U(VI)]and plutonium(IV)[Pu(IV)]from highly acidic solutions. 展开更多
关键词 COFs solid-phase extraction URANIUM PLUTONIUM highly acidic conditions
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A NEW DRY DEPOSITION VELOCITY PATTERN AND ITS PRACTICAL APPLICATION IN HIGH RESOLUTION REGIONAL ACID DEPOSITION MODEL 被引量:3
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作者 雷孝恩 《Acta meteorologica Sinica》 SCIE 1996年第1期118-128,共11页
A new dry deposition velocity pattern (NDDVP) for the study of region-scale dry deposition processes is developed. The mean ratio between NDDVP and 1022 experimental data of dry deposi- tion velocity V_d is 1. 06±... A new dry deposition velocity pattern (NDDVP) for the study of region-scale dry deposition processes is developed. The mean ratio between NDDVP and 1022 experimental data of dry deposi- tion velocity V_d is 1. 06±0.82. The result shows that NDDVP is well consistent with experimental data. Practical cases are forecasted by the high resolution regional acid deposition model (EM3) with both NDDVP and old V_d pattern. The maximum ratio between the central concentrations for SO4 can reach 2.4 only due to different V_d patterns. 3-D distributions of species concentrations and dry depositions forecasted by NDDVP are better than those by the old V_d pattern. 展开更多
关键词 new dry deposition velocity pattern (NDDVP) high resolution regional acid deposition model (EM3) canopy layer (CL) land-use
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