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    Wyświetlanie 1-7 z 7
    Tytuł:
    Purification and Characterization of a Low Molecular Weight Neutral Non-Starch Polysaccharide from Panax ginseng by Enzymatic Hydrolysis
    Autorzy:
    Ying, Ying
    Ma, Chao
    Zhang, Yajie
    Li, Xiaoping
    Wu, Hongxin
    Powiązania:
    https://bibliotekanauki.pl/articles/16538536.pdf
    Data publikacji:
    2023-02-21
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    ginseng polysaccharide
    chromatographic separation
    monosaccharide composition
    structure analysis
    Opis:
    In this study, a novel neutral non-starch polysaccharide (GP1A) was extracted using hot water from ginseng roots. Chemical characteristics, monosaccharide compositions and structure of GP1A were investigated using scanning electron microscopy, gel permeation chromatography, X-ray diffraction, Fourier transform infrared spectroscopy, gas chromatography with mass spectrometer, one-dimensional and two-dimensional nuclear magnetic resonance. The results indicated that the lyophilized GP1A was a homogeneous polysaccharide with a low molecular weight of 1.03 kDa. The dominating monosaccharides of GP1A were D-glucose, D-galactose, D-mannose, D-xylose and D-arabinose. The structure analysis indicated the main chain residues sequence of GP1A was α-D-Glcp-(6→3)-α-D-Galp-(1→1)-α-D-Glcp-(3→4)-β-D-Manp-(2→2)-β-D-Arap with branch chains of α-D-Glcp substituted at α-D-Galp and β-D-Xylp substituted at β-D-Manp.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2023, 73, 1; 70-79
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cracking control technique for continuous steel-concrete composite girders under negative bending moment
    Autorzy:
    Cai, Min
    Li, Wenjie
    Wan, Zhiyong
    Sheng, Jianjun
    Tan, Juliang
    Ma, Chao
    Powiązania:
    https://bibliotekanauki.pl/articles/27312132.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    dźwigar ciągły
    dźwigar zespolony
    dźwigar stalowo-betonowy
    odporność na pękanie
    wzmocnienie
    beton ultra wysokiej wartości
    continuous girder
    steel-concrete composite girder
    hogging moment
    cracking control
    strengthening
    ultra high performance concrete
    Opis:
    Continuous steel-concrete composite girder can fully utilize material strength and possess large spanning ability for bridge constructions. However, the weak cracking resistance at the negative bending moment region of the girder seriously harms its durability and serviceability. This paper investigates practical techniques to improve the cracking performance of continuous steel-concrete composite girders subjected to hogging moment.Areal continuous girderwas selected as the background bridge and introduced for numerical analysis. Modeling results show that under the serviceability limit state, the principle stress of concrete slabs near the middle piers of the bridgewas far beyond the allowable material strength, producing a maximum tensile stress of 10.0 MPa. Approaches for strengthening concrete decks at the negative moment region were developed and the effectiveness of each approach was assessed by examing the tensile stress in the slabs. Results indicate that the temporary counterweight approach decreased the maximum tensile stress in concrete slabs by 22%. Due to concrete shrinkage and creep, more than 65% of the prestressed compressive stresses in concrete slabs were finally dispersed to the steel beams. A thin ultra-high performance concrete (UHPC) overlay at the hogging moment region effectively increased the cracking resistance of the slabs, and practical engineering results convicted the applicability of the UHPC technique.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 3; 239--251
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Power Ultrasound on Microstructure Evolution During the Transient Liquid Stage of Ultrasonic-Promoted TLP Bonding SiCp/Al MMCs
    Autorzy:
    Zhou, Changzhuang
    Ma, Lin
    Zhu, Chao
    Cui, Qinghe
    Liang, Jindi
    Song, Yujian
    Powiązania:
    https://bibliotekanauki.pl/articles/2174569.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transient liquid phase bonding
    silicon carbide reinforced aluminum matrix composites
    ultrasonics
    zinc interlayer
    Opis:
    Ultrasound-promoted transient liquid phase bonding (U-TLP) is a high quality, high efficiency, and low-cost method for fast bonding of difficult-wetting materials in the atmospheric environment. In this paper, U-TLP was used to bond SiC particles reinforced aluminium-based metal matrix composite which particle volume fraction was 70%. The pure zinc foil was used as the intermediate layer. The effects of ultrasonic on microstructure evolution and mechanical properties of joints during the transient liquefaction stage were investigated. The mechanism of ultrasonic effects in the transient liquefaction stage of U-TLP was also inducted. The results showed that high volume fraction SiCp/Al MMCs were bonded well at low temperature in the air environment. Ultrasonic vibration can remove the oxide film on the surface of aluminum matrix composites, enhance the wettability of SiC particles with weld metal, promote atomic diffusion and homogenization of SiC particles, and improve the welding quality and efficiency. Reasonable increase of ultrasonic vibration time could effectively improve the joint strength.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1283--1291
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and verification of a high-precision laser measurement system for straightness and parallelism measurement
    Autorzy:
    Xu, Peng
    Li, Rui Jun
    Zhao, Wen Kai
    Chang, Zhen Xin
    Ma, Shao Hua
    Fan, Kuang Chao
    Powiązania:
    https://bibliotekanauki.pl/articles/1849006.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    straightness
    parallelism
    laser measurement system
    machine tool
    Opis:
    A laser measurement system for measuring straightness and parallelism error using a semiconductor laser was proposed. The designing principle of the developed system was analyzed. Addressing at the question of the divergence angle of the semiconductor laser being quite large and the reduction of measurement accuracy caused by the diffraction effect of the light spot at the long working distance, the optical structure of the system was optimized through a series of simulations and experiments. A plano-convex lens was used to collimate the laser beam and concentrate the energy distribution of the diffraction effect. The working distance of the system was increased from 2.6 m to 4.6 m after the optical optimization, and the repeatability of the displacement measurement is kept within 2.2 m in the total measurement range. The performance of the developed system was verified by measuring the straightness of a machine tool through the comparison tests with two commercial multi-degree-of-freedom measurement systems. Two different measurement methods were used to verify the measurement accuracy. The comparison results show that during the straightness measurement of the machine tool, the laser head should be fixed in front of the moving axis, and the sensing part should move with the moving table of the machine tool. Results also show that the measurement error of the straightness measurement is less than 3 m compared with the commercial systems. The developed laser measurement system has the advantages of high precision, long working distance, low cost, and suitability for straightness and parallelism error measurement.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 479-495
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and verification of a high-precision laser measurement system for straightness and parallelism measurement
    Autorzy:
    Xu, Peng
    Li, Rui Jun
    Zhao, Wen Kai
    Chang, Zhen Xin
    Ma, Shao Hua
    Fan, Kuang Chao
    Powiązania:
    https://bibliotekanauki.pl/articles/1849049.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    straightness
    parallelism
    laser measurement system
    machine tool
    Opis:
    A laser measurement system for measuring straightness and parallelism error using a semiconductor laser was proposed. The designing principle of the developed system was analyzed. Addressing at the question of the divergence angle of the semiconductor laser being quite large and the reduction of measurement accuracy caused by the diffraction effect of the light spot at the long working distance, the optical structure of the system was optimized through a series of simulations and experiments. A plano-convex lens was used to collimate the laser beam and concentrate the energy distribution of the diffraction effect. The working distance of the system was increased from 2.6 m to 4.6 m after the optical optimization, and the repeatability of the displacement measurement is kept within 2.2 m in the total measurement range. The performance of the developed system was verified by measuring the straightness of a machine tool through the comparison tests with two commercial multi-degree-of-freedom measurement systems. Two different measurement methods were used to verify the measurement accuracy. The comparison results show that during the straightness measurement of the machine tool, the laser head should be fixed in front of the moving axis, and the sensing part should move with the moving table of the machine tool. Results also show that the measurement error of the straightness measurement is less than 3 m compared with the commercial systems. The developed laser measurement system has the advantages of high precision, long working distance, low cost, and suitability for straightness and parallelism error measurement.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 479-495
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and verification of a high-precision laser measurement system for straightness and parallelism measurement
    Autorzy:
    Xu, Peng
    Li, Rui Jun
    Zhao, Wen Kai
    Chang, Zhen Xin
    Ma, Shao Hua
    Fan, Kuang Chao
    Powiązania:
    https://bibliotekanauki.pl/articles/1849061.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    straightness
    parallelism
    laser measurement system
    machine tool
    Opis:
    A laser measurement system for measuring straightness and parallelism error using a semiconductor laser was proposed. The designing principle of the developed system was analyzed. Addressing at the question of the divergence angle of the semiconductor laser being quite large and the reduction of measurement accuracy caused by the diffraction effect of the light spot at the long working distance, the optical structure of the system was optimized through a series of simulations and experiments. A plano-convex lens was used to collimate the laser beam and concentrate the energy distribution of the diffraction effect. The working distance of the system was increased from 2.6 m to 4.6 m after the optical optimization, and the repeatability of the displacement measurement is kept within 2.2 m in the total measurement range. The performance of the developed system was verified by measuring the straightness of a machine tool through the comparison tests with two commercial multi-degree-of-freedom measurement systems. Two different measurement methods were used to verify the measurement accuracy. The comparison results show that during the straightness measurement of the machine tool, the laser head should be fixed in front of the moving axis, and the sensing part should move with the moving table of the machine tool. Results also show that the measurement error of the straightness measurement is less than 3 m compared with the commercial systems. The developed laser measurement system has the advantages of high precision, long working distance, low cost, and suitability for straightness and parallelism error measurement.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 479-495
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SCREENING THE SPECIFIC SUBSTRATES OF ADENYLATION DOMAIN FROM MARINE ACTINOMYCETES BY FLUORESCENCE QUENCHING AND ISOTHERMAL TITRATION CALORIMETRY
    Autorzy:
    LEI, MING
    ZHAO, ZHIJUAN
    LIU, KE
    LIU, YANLI
    ZHANG, HUI
    WU, XUE
    GONG, SIYING
    MA, YANLING
    ZHAO, HAOBIN
    LIU, JINLIN
    MIN, JINRONG
    QI, CHAO
    Powiązania:
    https://bibliotekanauki.pl/articles/895432.pdf
    Data publikacji:
    2018-12-31
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    A domain
    Aspartic acid
    Fluorescence quenching (FQ)
    Isothermal titration calorimetry (ITC)
    Marine actinomycetes
    static quenching
    Opis:
    Adenylation domain (A domain) is a model of non-ribosomal peptide synthetases (NRPs), responsible for binding and activating the substrates-amino acids. In this study, a pGEX-2T-sare0718 recombinant plasmid (the gene sare0718 was cloned from Salinispora arenicola CNS-205, S.arenicola CNS-205) was transformed and expressed as a protein GST-Sare0718. Fluorescence quenching (FQ) was conducted to investigate the binding of 20 common amino acids to GST-Sare0718, then isothermal titration calorimetry (ITC) also be used[changed]. The results of FQ revealed that intrinsic fluorescence of GST-Sare0718 is quenched steadily by addition of aspartic acid (Asp) and glutamine (Gln) through static quenching mechanism. The binding constants Ka are Asp (1.504×106 L/mol) ≥ Gln (1.468×105 L/mol). And there is one binding site on the protein GST-Sare0718. We confirmed Asp preference of GST-Sare0718 by ITC. Therefore, Asp is the specific substrate. In addition, the experimental data indicates that the prediction system, “the specificity-conferring code”, is not suitable for marine actinomycetes. So it is urgent to set up a special predictive system for marine actinomycetes.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 6; 1287-1292
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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