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  • 1
    Publication Date: 2018-03-28
    Description: A novel 65.8-kb multidrug resistance transposon, designated Tn 6450 , was characterized in a Proteus mirabilis isolate from chicken in China. Tn 6450 contains 18 different antimicrobial resistance genes, including cephalosporinase gene bla DHA-1 and fluoroquinolone resistance genes qnrA1 and aac(6 ' )-Ib-cr . It carries a class 1/2 hybrid integron composed of intI2 and a 3' conserved segment of the class 1 integron. Tn 6450 is derived from Tn 7 via acquisition of new mobile elements and resistance genes.
    Print ISSN: 0066-4804
    Electronic ISSN: 1098-6596
    Topics: Biology , Medicine
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  • 2
    Publication Date: 2018-02-09
    Description: The Dongxiang Blue-shelled chicken is one of the most valuable Chinese indigenous poultry breeds. However, compared to the Italian native White Leghorn, although this Chinese breed possesses numerous favorable characteristics, it also exhibits lower growth performance and fertility. Here, we utilized genotyping sequencing data obtained via genome reduction on a sequencing platform to detect 100,114 single nucleotide polymorphisms and perform further biological analysis and functional annotation. We employed cross-population extended haplotype homozygosity, eigenvector decomposition combined with genome-wide association studies (EigenGWAS), and efficient mixed-model association expedited methods to detect areas of the genome that are potential selected regions (PSR) in both chicken breeds, and performed gene ontology (GO) enrichment and quantitative trait loci (QTL) analyses annotating using the Kyoto Encyclopedia of Genes and Genomes. The results of this study revealed a total of 2424 outlier loci ( p -value 〈0.01), of which 2144 occur in the White Leghorn breed and 280 occur in the Dongxiang Blue-shelled chicken. These correspond to 327 and 94 PSRs containing 297 and 54 genes, respectively. The most significantly selected genes in Blue-shelled chicken are TMEM141 and CLIC3 , while the SLCO1B3 gene, related to eggshell color, was identified via EigenGWAS. We show that the White Leghorn genes JARID2 , RBMS3 , GPC3 , TRIB2 , ROBO1 , SAMSN1 , OSBP2 , and IGFALS are involved in immunity, reproduction, and growth, and thus might represent footprints of the selection process. In contrast, we identified six significantly enriched pathways in the Dongxiang Blue-shelled chicken that are related to amino acid and lipid metabolism as well as signal transduction. Our results also reveal the presence of a GO term associated with cell metabolism that occurs mainly in the White Leghorn breed, while the most significant QTL regions mapped to the Chicken QTL Database (GG_4.0) for the Dongxiang Blue-shelled breed are predominantly related to lesions, bone mineral content, and other related traits compared to tibia length and body weight ( i.e. , at 14, 28, 42, and 70 d) in the White Leghorn. The results of this study highlight differences in growth, immunity, and egg quality traits between the two breeds, and provide a foundation for the exploration of their genetic mechanisms.
    Electronic ISSN: 2160-1836
    Topics: Biology
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  • 3
    ISSN: 1434-6079
    Keywords: 03.65. ; 36.40.+d ; 21.60.-n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Simulating the one-particle spectra of the infinite-well potential by a model, we study the symmetry and the shell-structure of octupole deformations as well as the possible occurrence of octupole (and quadrupole) instabilities. Among various types of octupole deformations investigated theY 32-type deformation is found to have a strong shell-structure as well as a very interesting symmetry which leads to the occurrence of highly-degenerate single-particle levels. One particle spectra of the octupole-coupled two-level model (withl andl + 3) are analytically studied in the limit of large angular-momentum,l.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-601X
    Keywords: 21.10.Re ; 21.60Jz ; 23.40.Hc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Gamow-Teller (GT)β + -decay probability is estimated for three neutron-deficientN=Z nuclei, 36 72 Kr36, 38 76 Sr38, and 40 80 Zr40, using a quasiparticle Tamm-Dancoff approximation (TDA) based on a Skyrme-type deformed Hartree-Fock (HF) calculation. The distribution of the GT strength is found to depend sensitively on the nuclear shape, namely, a spherical shape or a prolate or an oblate deformation of the obtained HF minima. At the shape of the lowest HF minimum about a half of the calculated total GT strength lies below the ground state of thoseN=Z mother nuclei, and there seems to be a good chance to observeβ-delayed proton emission.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1435-1536
    Keywords: Key words Thermosensitive ; Gel ; Lower critical solution temperature ; Fast response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A gel is a kind of water-swellable but water-insoluble, crosslinked polymer. Some kinds of gels can respond to external temperature changes. This specific property is useful in biomedical and other technological fields. In this paper the synthesis of a novel, thermosensitive gel by the copolymerization of N-isopropylacrylamide or N,N- diethylacrylamide with 3-methacryloxypropyltrimethoxy silane (MPTMS) is reported. The formation of the gel is caused through the interaction of MPTMS under acidic condition. This thermosensitive gel can deswell and reswell quickly in response to the external temperature changes, this behavior probably being due to the heterogeneous structure of the gel produced. This fast-response gel may be useful both in biomedical and biotechnological fields.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1572-946X
    Keywords: Pulsar ; Supernova Remnant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we argue that the PSR B 1849+00 and SNR G33.6+0.1 are possibly associated, because (1) there is only a small probability of chance superposition in this sky region; (2) although the estimates of the distance and the age of the two objects contain a high degree of uncertainty, they are not inconsistent; (3) the implied transverse velocity of the pulsar is also quite reasonable according to the measured distribution of pulsar velocities. The association could be verified by measuring the proper motion of PSR B 1849+00, which is estimated to be about 10 mas·yr−1.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Uniform hematite particles with an average size of 400 Å were prepared for reducing the influence of the particle-size distribution on the measurement of the Morin temperature. A series of Mössbauer spectra at different temperatures have been recorded. The Morin transition occurs at 216 K for sample B coated with a surfactant-oleic acid, and it occurs at 192 K for uncoated sample A. The temperature intervals in the region of the spin flip are almost the same for both samples. These results show that aT m shift could arise from surface effects such as spin pinning directly induced by a surfactant, and that the distortion produces restriction not only on the top few layers, but also on the whole volume of the particle.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1572-9567
    Keywords: composites ; copper ; flash method ; iron ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method for measuring thermal diffusivity in one of the layers of a two-layer composite sample has been described. The heat transfer problem of a two-layer sample associated with pulse thermal diffusivity measurements has been analyzed for two cases: exponential and square-wave pulses. According to our measurements, a triangular heat-pulse function approximates reasonably well the output of the Nd-glass laser. In this paper, an expression is derived for the temperature transient at the rear face of two-layer sample being subjected to a triangular heat-pulse input on the front face. The analytical solution of the problem forms the basis of our method of data reduction. This solution has been programmed for computer processing of the data. The method described here has been successfully tested by limited measurements on copper and iron.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1572-9567
    Keywords: anisotropic materials ; pyrolytic graphite ; pyrolytic boron nitride ; thermal conductivity ; thermal diffusivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The laser pulse method can be successfully applied to the measurement of thermal diffusivity of isotropic materials subject to some assumptions. For anisotropic materials, this method is applicable to the measurement of principal thermal diffusivity only on the condition that there is no difference in direction between the principal axis and that of the temperature gradient. After analyzing the heat conduction process in an anisotropic solid, it has been shown that large errors in the measurement of thermal diffusivity would exist if the direction of the principal axis deviates inconspicuously from that of the temperature gradient. The experimental results of thermal diffusivity of highly oriented pyrolytic graphite (HOPG) samples with various deviation angles have been compared with the analytical results. The laser pulse method is not applicable to measurements on semitransparent pyrolytic boron nitride (PBN). We adopted a two-layer composite sample to measure the thermal diffusivity of PBN in the c direction and a particular graphite-PBN composite sample has been prepared which has a very low thermal resistance at the interface. The thermal diffusivity and thermal conductivity of PG (below 2300°C) and PBN (below 1000°C) are given.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Analytical Biochemistry 176 (1989), S. 427-431 
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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