1,123 research outputs found
Effect of alkali metal cation on the anaerobic hydrolysis and acidogenesis of vegetable waste
No full text
Photoautotrophic outdoor two-stage cultivation for oleaginous microalgae Scenedesmus obtusus XJ-15
No full textIn this study, Scenedesmus obtusus XJ-15 was firstly selected from seven strains microalgae (Chlorophyta, Scenedesmaceae) and then cultivated using a two-stage strategy, which composed of fast cell growth in stage I and followed by lipid induction in stage II in 5-L flasks outdoors. In stage I, the biomass productivity was increased from 139.4 to 212.1 mg L-1 d(-1). In stage II, lipid content was increased from 26.1% to 47.7% by adding NaCl into the culture. This two-stage process was also realized in an 140-L photobioreactor outdoors, with a biomass productivity of 86.5 mg L-1 d(-1) and CO2 fixation rate of 170.0 mg L-1 d(-1) in the first stage, and high lipid content of 42.1% in the second stage. With such a culture strategy, the overall lipid productivity was improved and better biodiesel quality was obtained. These results suggested the photoautotrophic two-stage system was not only feasible but also effective. (C) 2013 Elsevier Ltd. All rights reserved.In this study, Scenedesmus obtusus XJ-15 was firstly selected from seven strains microalgae (Chlorophyta, Scenedesmaceae) and then cultivated using a two-stage strategy, which composed of fast cell growth in stage I and followed by lipid induction in stage II in 5-L flasks outdoors. In stage I, the biomass productivity was increased from 139.4 to 212.1 mg L-1 d(-1). In stage II, lipid content was increased from 26.1% to 47.7% by adding NaCl into the culture. This two-stage process was also realized in an 140-L photobioreactor outdoors, with a biomass productivity of 86.5 mg L-1 d(-1) and CO2 fixation rate of 170.0 mg L-1 d(-1) in the first stage, and high lipid content of 42.1% in the second stage. With such a culture strategy, the overall lipid productivity was improved and better biodiesel quality was obtained. These results suggested the photoautotrophic two-stage system was not only feasible but also effective. (C) 2013 Elsevier Ltd. All rights reserved
The global L-2 stability of solutions to three dimensional MHD equations
No full textIn this paper, we mainly study the global L-2 stability for large solutions to the MHD equations in three-dimensional bounded or unbounded domains. Under suitable conditions of the large solutions, it is shown that the large solutions are stable. And we obtain the equivalent condition of this stability condition. Moreover, the global existence and the stability of two-dimensional MHD equations under three-dimensional perturbations are also established
A critical review of the proposals for reform of the education system in Hong Kong with particular reference to curriculum integration and lifelong learning
Full text linkEThOS - Electronic Theses Online ServiceGBUnited Kingdo
The historical importance of the Chinese fragments from Dunhuang in the British Library
No full textHumanities, MultidisciplinaryA&HCI0ARTICLE178-892
TWIN-GAP IN HIGH-T(C) PEROVSKITE COPPER OXIDES
No full textThis paper shows that the gap in high-T(c) perovskite copper oxides is always twin, which corresponds to the two kinds of attractive potentials in different regions of k. The twin-gap has been observed in a lot of experiments. The special temperature-dependence of the twin-gap can quantitatively explain the observed data of penetration depth vs temperature.Physics, MultidisciplinarySCI(E)中国科学引文数据库(CSCD)2NOTE1113-1162
Theoretical descriptions of nematic polymers, networks and gels
No full textMain-chain and side-chain nematic polymers, nematic networks (the crosslinked polymers) and nematic gels (the swollen networks) have been reviewed in this article. The transition from nematic to isotropic phase, the mean square end-to-end distance of polymers, the rubber elasticity of networks and the phase diagrams of gel systems are all addressed theoretically. (C) 1997 Published by Elsevier Science Ltd.Polymer ScienceSCI(E)EI9REVIEW4735-7642
Analysing complete genome sequence of swine hepatitis E virus (HEV), strain CHN-XJ-SW13 isolated from Xinjiang, China: Putative host range, and disease severity determinants in HEV
No full textHepatitis E is a worldwide public health problem, particular in areas where hygiene conditions are poor. Hepatitis E virus (HEV) has at least four genotypes: genotypes 1 and 2 exclusively infect human; while genotypes 3 and 4, are considered to be a zoonotic agent, infecting both humans and animals. This study was aimed at determining why genotype 3 and 4 HEV strains isolated from swine are able to cross species borders, whereas genotype1 and 2 strains isolated from humans are not. The full length genome of the swine HEV isolate CHN-XJ-SW13 was amplified as overlapping fragments using reverse-transcription-nested polymerase chain reaction (RT-nPCR) and rapid amplification of cDNA ends (RACE). The sequence of CHN-XJ-SW13 was compared with those of 90 HEV strains covering genotype 1-4 retrieved from GenBank. Possible regions of the viral genome, specifying the host range of HEV or associated with the severity of hepatitis E disease, were then screened for with the aid of the ALIGNX sequences alignment software package. The CHN-XJ-SW13 swine HEV isolate was determined to be a novel subtype of genotype 4, whose sequence provided several valuable clues for tracing the sources of human HEV infection. 25 specific nucleotide positions were identified to possibly being involved specifying the host range of HEV or determining the severity of hepatitis E disease. (c) 2011 Elsevier B.V. All rights reserved.Infectious DiseasesSCI(E)0ARTICLE3618-6231
New phenanthrene glycosides from Dendrobium denneanum and their cytotoxic activity
No full textFive new phenanthrene glycosides, denneanosides A-E (1-5), and one new 9,10-dihydrophenanthrene glycoside, denneanoside F (6) were isolated from the stem of Dendrobium denneanum. The chemical structures of the new compounds were established on the basis of extensive spectroscopic data. The isolated compounds were evaluated for their in vitro cytotoxic activity against SNU387 hepatocellular carcinoma cell line. Compounds 1-3 showed moderate cytotoxic activities while compounds 4-6 showed weak activities. (C) 2013 Phytochemical Society of Europe. Published by Elsevier B.V
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