最新刊期
卷 48 ， 期 5 ， 2009
- 摘要：Key words:nonlinear dynamical equation,precise time-step integration method,Runge-Kutta integration,calculation technique of matrix exponential,numerical integration关键词：nonlinear dynamical equation;precise time-step integration method;Runge-Kutta integration;calculation technique of matrix exponential;numerical integration
- 2078
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- 214
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发布时间：2023-12-11 - 关键词：RFID system;security protocol;NTRU public key cryptosystem;authentication protocol
- 1689
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- 160
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发布时间：2023-12-11 - 关键词：C*-normal subgroup;S-quasinormally embedded subgroup;p-nilpotent group
- 1489
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- 193
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发布时间：2023-12-11 - 关键词：positive definite matrices;symmetric product;spectral radius;algorithm
- 1978
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- 159
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发布时间：2023-12-11 - 关键词：α-mixing samples;empirical Bayes test;asymptotic optimality;convergence rates
- 1669
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- 129
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- 0
发布时间：2023-12-11 - 关键词：3D stratum model;stratum;construction;present research;trends
- 1404
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- 149
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发布时间：2023-12-11 - 摘要：Key words:block Turbo codes(BTC),iterative decoding,Chase algorithm,SignaltoNoise Ratio(SNR),bit error rate(BER)关键词：block Turbo codes(BTC);iterative decoding;Chase algorithm;SignaltoNoise Ratio(SNR);bit error rate(BER)
- 1457
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- 134
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发布时间：2023-12-11 - 关键词：OFDM;bit loading;limited feedback;margin adaptive
- 1491
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- 140
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发布时间：2023-12-11 - 关键词：sub-health;concrete beam bridge;serviceability carrying capacity;load limit
- 1519
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- 164
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发布时间：2023-12-11 - 摘要：Key words:HBr2+density function theory,structural property,manybody expansion theory,analytical potential energy function关键词：HBr2+;density function theory;structural property;manybody expansion theory;analytical potential energy function
- 1583
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- 149
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发布时间：2023-12-11 - 关键词：solar seawater desalination;direct heated;thermo economy;isolation
- 1416
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- 131
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发布时间：2023-12-11 - 摘要：In the tropical and subtropical ocean, the starfish Acanthaster planci was notorious for destroying coral. In this paper, we reported the extract, chemical constituent and content of fatty acids from the whole body of Acanthaster planci. The free fatty acids were extracted with petroleum ether and were separated on silicon gel column chromatography. The ethyl acetate-soluble lipid fraction and water-soluble lipid fraction were subjected to hydrochloric acid-catalyzed methanolysis, then were extracted with petroleum ether, respectively. Based on the GC-MS analysis, a series of C14~C20 saturated and unsaturated fatty acids were identified in free fatty acids. Prolific omega 3 and omega 6 polyunsaturated fatty acids were composed of 5,8,11,14-eicosatetraenoic acid methyl ester (major), 8,11,14-eicosatrienoic acid and 5,8,11,14,17- eicosapentaenoic acid methyl ester. Saturated fatty acids and high content steroids were found in the extracts of methanolysis products. The omega fatty acids are the major building blocks of cellular membranes, and they keep the cell membrane optimally fluid. The omegas can convert to hormone like substances that influence metabolic activities. 5,8,11,14-eicosatetraenoic acid, which was previously found as feeding attractant, is the primary essential fatty acid of the starfish Acanthaster planci. It is postulated that eicosatetraenoic acid cannot be constructed within the body of starfish Acanthaster planci from other components by any known biosynthetic pathways, and therefore must be obtained from the diet. The effective methods used to extract the fatty acids according to their polarity respectively excluded interferes of other structural type components and gained perfect isolation and identification results with high accuracy and good repeatability in GC-MS experiments. The finding of high content of polyunsaturated fatty acids and bioactive steroids with promising application in the fields of drug and food industry will also provide useful information for further researches and exploitation on the starfish Acanthaster planci.关键词：Acanthaster planci;fatty acid;5;8;11;14-eicosatetraenoic acid;feeding attractant
- 1665
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- 166
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- 0
发布时间：2023-12-11 - 关键词：CdFe2O4 solid solution;Al doping phase structure;conductivity;gassensing properties
- 1460
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- 132
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- 0
发布时间：2023-12-11 -
- 1568
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- 163
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发布时间：2023-12-11 - 关键词：COX-2 inhibitors;2-(4-methanesulfonylphenyl) pyran-4-ones;CoMFA;CoMSIA;drug design
- 1542
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- 146
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- 0
发布时间：2023-12-11 - 关键词：three-dimensional electrode;phenol;·OH free radical;electro-catalytic oxidation
- 1760
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- 137
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发布时间：2023-12-11 - 关键词：capillary electrophoresis;electrochemiluminescence;erythromycin ethylsuccinate
- 1598
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- 132
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- 0
发布时间：2023-12-11 - 摘要：Key words:Alzheimer's Disease(AD),proberberine,Amyloid precursor protein(APP),β-site APP cleaving enzyme 1 (BACE1),α secretase form of soluble amyloid precursor protein(sAPPα),acetylcholinesterase(AChE)关键词：Alzheimer's Disease(AD);proberberine;Amyloid precursor protein(APP);β-site APP cleaving enzyme 1 (BACE1);α secretase form of soluble amyloid precursor protein(sAPPα);acetylcholinesterase(AChE)
- 1538
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- 149
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- 0
发布时间：2023-12-11 - 关键词：polyethylenimine;HMGB1;gene delivery
- 1520
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- 127
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- 0
发布时间：2023-12-11 - 关键词：Euplotes elegans;cortical cytoskeleton;ultrastructure;α-and β-tubulin;centrin
- 1496
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- 175
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- 0
发布时间：2023-12-11 - 关键词：spotted longbarbel catfish (Mystus guttatus);GtH;seasonal change;MT
- 1626
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- 151
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- 0
发布时间：2023-12-11 - 关键词：cell signal system;electromagnetic field;calcium oscillation;synchronization
- 1565
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- 131
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发布时间：2023-12-11 - 关键词：wheat leave;electrical impedance spectroscopy;heavy metal
- 1643
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- 136
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- 0
发布时间：2023-12-11 - 摘要：Key words:Taxus wallichiana var.mairei,taxoid 7-beta-hydroxylase gene,positive selection,negative selection关键词：Taxus wallichiana var.mairei;taxoid 7-beta-hydroxylase gene;positive selection;negative selection
- 1670
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- 118
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发布时间：2023-12-11 - 摘要：Key words:temporal characteristics,ecological flow,ecological flow regime,the middle and lower reaches of the Yellow River关键词：temporal characteristics;ecological flow;ecological flow regime;the middle and lower reaches of the Yellow River
- 1425
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- 194
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- 0
发布时间：2023-12-11 - 摘要：Key words:northern continental slope of South China Sea,fault,fractal,gas hydrate,tectonic environment,sedimentation关键词：northern continental slope of South China Sea;fault;fractal;gas hydrate;tectonic environment;sedimentation
- 1476
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- 157
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- 0
发布时间：2023-12-11 - 关键词：soil organic carbon;active organic carbon;forest soil;Guangzhou;carbon pool;allocation
- 1654
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- 135
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发布时间：2023-12-11 - 摘要：Key words:alpine ecosystem of NTP,vegetation variation,remote sensing information,NOAA-AVHRR,climate change,human activities关键词：alpine ecosystem of NTP;vegetation variation;remote sensing information;NOAA-AVHRR;climate change;human activities
- 1755
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- 179
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- 0
发布时间：2023-12-11 - 关键词：rainfall;mode identification;transfer index of directional information;Dongjaing Basin
- 1640
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- 134
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发布时间：2023-12-11
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