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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and Certification of Re-Os Dating Reference Materials: Molybdenites HLP and JDC (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 28 (2004), S. 0 
    Details
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Two Re-Os dating reference material molybdenites were prepared. Molybdenite JDC and molybdenite HLP are from a carbonate vein-type molybdenum-(lead)-uranium deposit in the Jinduicheng-Huanglongpu area of Shaanxi province, China. The samples proved to be homogeneous, based on the coefficient of variation of analytical results and an analysis of variance test. The sampling weight was 0.1 g for JDC and 0.025 g for HLP. An isotope dilution method was used for the determination of Re and Os. Sample decomposition and pre-concentration of Re and Os prior to measurement were accomplished using a variety of methods: acid digestion, alkali fusion, ion exchange and solvent extraction. Negative thermal ionisation mass spectrometry and inductively coupled plasma-mass spectrometry were used for the determination of Re and 187Os concentration and isotope ratios. The certified values include the contents of Re and Os and the model ages. For HLP, the Re content was 283.8 ± 6.2 μg g−1, 187Os was 659 ± 14 ng g−1 and the Re-Os model age was 221.4 ± 5.6 Ma. For JDC, the Re content was 17.39 ± 0.32 μg g−1, 187Os was 25.46 ± 0.60 ng g−1 and the Re-Os model age was 139.6 ± 3.8 Ma. Uncertainties for both certified reference materials are stated at the 95% level of confidence. Three laboratories (from three countries: PR. China, USA, Sweden) joined in the certification programme. These certified reference materials are primarily useful for Re-Os dating of molybdenite, sulfides, black shale, etc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-908X.2004.tb01042.x
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  • 2
    Electronic Resource
    Electronic Resource
    Increased susceptibility to photoinhibition in pre-existing needles experiencing low temperature at spring budbreak in Sakhalin spruce (Picea glehnii) seedlings (2004)
    Oxford, UK; Malden, USA : Munksgaard International Publishers
    Physiologia plantarum 122 (2004), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The seasonal changes in photosynthetic properties in 1-year-old needles of Sakhalin spruce (Picea glehnii) were measured using the chlorophyll fluorescence technique at various temperatures (5, 10, 20, 25 and 30°C). In the course of seasonal change, a temporary decrease in the quantum yield of PSII electron transport (ΦPSII) was observed just before budbreak. A decline in photochemical quenching (qP) was observed at the same time as that of ΦPSII but only at the two lowest temperatures (5 and 10°C). Photochemical efficiency of open PSII (Fv′/Fm′) also declined just before budbreak at 25 and 30°C. An increase in thermal energy dissipation as indicated by a decrease in Fv′/Fm′ before budbreak was not significant at lower temperatures (5 and 10°C) in spite of the declines in qP. This implies that thermal energy dissipation necessitated by the decline in ΦPSII might not be sufficiently strong to prevent a decline in qP at lower temperatures. On the other hand, at higher temperatures no decline was observed in qP because ΦPSII decreased to a relatively small extent, therefore thermal energy dissipation is sufficient in coping with the excessive energy accumulation in PSII. Seedlings of Sakhalin spruce exposed to ambient air temperature below 10°C before budbreak exhibited photoinhibition indicated by a decrease in the maximal photochemical efficiency of PSII (Fv/Fm) after an overnight dark adaptation. The present study suggests that 1-year-old shoots of Sakhalin spruce have an increased susceptibility to photoinhibition at low temperature just before budbreak.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.2004.00393.x
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic diversity of small eukaryotes from the coastal waters of Nansha Islands in China (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 240 (2004), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Population structures and genetic diversity of the small eukaryotic plankton from the coastal waters of the Nansha Islands in China were investigated. Two genes libraries using 18S rDNA of the marine small eukaryotes were constituted, and 323 clones were identified within alveolates (more than 43%), acanthareas, viridiplantaes, and stramenopiles. Many novel clones were detected in the two libraries, including two groups of alveolates and two clades related to both acanthareas and polycystineas. Several sequences unrelated to any other known eukaryotes may represent early branches in the phylogenetic tree. Our results reveal that there is a high diversity and abundance of small eukaryotes in the marine regions of China.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsle.2004.09.030
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  • 4
    Electronic Resource
    Electronic Resource
    Genetic variation of Cordyceps sinensis, a fruit-body-producing entomopathogenic species from different geographical regions in China (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 230 (2004), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Cordyceps sinensis is one of the most valuable medicinal fungi in the Orient. It is naturally distributed in the eastern extension area of the Qinghai–Tibet plateau, at an altitude over 4000 m high. In order to investigate genetic variation and evolutionary relationships of C. sinensis from different geographical regions, 17 isolates of C. sinensis were collected from different provinces and the complete sequences of rDNA ITS were determined. On the basis of 5.8S rDNA and ITS region analysis, it was clearly shown that the ITS sequences within C. sinensis are highly homologous regardless of geographical origin. The distance values between the sequences in this study were lower than 0.03. This implied that C. sinensis from different geographic regions are the same species; they are not different species or a species complex. The results also showed that distance values between C. sinensis and Hirsutella sinensis are of the same order as those within C. sinensis from different geographic regions. This confirmed our previous results that C. sinensis should only have H. sinensis as its asexual stage whatever the geographic region from which the samples were collected. An rDNA ITS clone library was established to obtain further evidence for the interpretation of the fungal community structure from C. sinensis and to confirm the accuracy of the taxonomic identities produced by directly sequencing the rDNA ITS region. The discrimination between intraspecies of C. sinensis might provide additional data for the authentication of medicinal material at the species or intraspecies level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0378-1097(03)00889-9
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  • 5
    Electronic Resource
    Electronic Resource
    Phylogenetic diversity of bacteria in the leachate of a full-scale recirculating landfill (2004)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 50 (2004), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We analyzed the phylogenetic composition of bacterial community in the effluent leachate of a full-scale recirculating landfill using a culture-independent molecular approach. 16S rRNA genes were amplified directly from leachate DNA with universally conserved and Bacteria-specific rDNA primers and cloned. The clone library was screened by restriction fragment length polymorphism, and representative rDNA sequences were determined. Many bacterial sequences displaying relatively low levels of similarity to any other hitherto reported rDNA sequences were retrieved. A total of 103 bacterial sequence types were found in 195 analyzed clones. Roughly 90% of the sequence types were affiliated with low-G + C gram-positive bacteria, the Chlamydiae/Verrucomicrobia group and with the Cytophaga–Flexibacter–Bacteroides group, where the clone distribution was 53%, 21% and 19%, respectively. The other 10 sequence types represented 7% of the total clones, and they were either affiliated with well-recognized bacterial divisions Planctomycetes, Spirochaetes, Proteobacteria and Actinobacteria, or grouped within two recently proposed candidate divisions OP9 and OP11. The most frequent sequence type represented less than 10% of the total bacterial 16S rRNA gene sequences, and the 15 more frequent sequence types accounted for at least 47% of these sequences. Some rRNA gene sequences clustered with genera or taxa that were classically identified within anaerobic treatment systems. These results indicate that, despite recent expansion, our knowledge on the microbial diversity in anaerobic treatment systems is still limited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/j.femsec.2004.06.008
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  • 6
    Electronic Resource
    Electronic Resource
    A comparison study of Chinese domestic tourism: China vs the USA (2004)
    Bingley : Emerald
    International journal of contemporary hospitality management 16 (2004), S. 108-115 
    Details
    ISSN: 0959-6119
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: After achieving great success in developing international travel business, China's tourism authorities, the local and international travel agencies and lodging companies are now diverting their attention to the untapped and big potential market of China's domestic tourism business. By using a comparison approach, this study examines the current features of China's domestic tourism. Various aspects of China's domestic tourism are analyzed and discussed in a way of comparison with the USA. The aspects are: sources of information used by tourists, tourists' transport and lodging patterns, tourists' traveling activities and spending patterns, and governments' role in domestic tourism. Discussions and conclusions are made based on a series of comparisons. Implications for both China's government and travel agencies and international companies interested in China's domestic travel business are provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09596110410519991
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  • 7
    Electronic Resource
    Electronic Resource
    The inhibition effects of a new heterocyclic bisquaternary ammonium salt in simulated oilfield water (2004)
    Bradford : Emerald
    Anti-corrosion 51 (2004), S. 272-276 
    Details
    ISSN: 0003-5599
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A kind of novel heterocyclic bisquaternary ammonium salt (MBQA) was successfully synthesised with metronidazole as matrix and dichloroethyl ether as the link agent. Weight loss measurement, potentiodynamic polarisation curves, electrochemical impedance spectroscopy and atomic force microscopy were used to evaluate the corrosion inhibiting performance of MBQA in simulated oilfield water. Experimental data revealed that MBQA acted as an inhibitor in the acidic environment and, furthermore, the compound was a mixed-type inhibitor. It was found that inhibition efficiency increased with an increase in MBQA concentration at different temperatures. The process of inhibition was attributed to the formation of an adsorbed film on the metal surface, which protected the metal against corrosive agents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/00035590410541346
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  • 8
    Electronic Resource
    Electronic Resource
    Study on Eliminating Mechanism of Surface Metal in Nano-Polishing Process (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 259-260 (Mar. 2004), p. 476-480 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.259-260.476.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Pulse Electroforming of Nanocrystalline Ni-Mn Alloy (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 259-260 (Mar. 2004), p. 596-601 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.259-260.596.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation of Suitability of Homogeneous Deformation Assumption on Generating Material Parameters (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 274-276 (Oct. 2004), p. 595-600 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.274-276.595.pdf
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