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Wyszukujesz frazę "Liu, Ting-ting" wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    High-grade mutant OmpF induces decreased bacterial survival rate
    Autorzy:
    Zhao, Zhi-ping
    Liu, Ting-ting
    Zhang, Li
    Luo, Min
    Nie, Xin
    Li, Zai-xin
    Pan, Yu
    Powiązania:
    https://bibliotekanauki.pl/articles/1039304.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    antibiotic resistance
    mOmpF
    OmpF
    outer membrane protein
    bacterial survival rate
    Opis:
    OmpF plays very important roles in the influx of antibiotics and bacterial survival in the presence of antibiotics. However, high-grade mutant OmpF and its function in decreasing bacterial survival rate have not been reported to date. In the present study, we cloned a high-grade mutant OmpF (mOmpF) and sequence analysis suggested that over 45 percent of the DNA sequence was significantly mutated, leading to dramatic changes in over 55 percent of the amino acid sequence. mOmpF protein was successfully expressed. When grown in the presence of antibiotic, the bacterial survival rate decreased and the antibiotic inhibition zone became larger with the increase of the mOmpF. It was concluded that concentration of high-grade mutant mOmpF dramatically influenced the bacterial survival rate. The study presented here may provide insights into better understanding of the relationships between structure and function of OmpF.
    Źródło:
    Acta Biochimica Polonica; 2014, 61, 2; 369-373
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photo-oxidative Aging Behaviors of Acrylic Coatings during UV Irradiation Investigated by Positron Annihilation Spectroscopy
    Autorzy:
    Zhao, Xipo
    Cai, Xiaolin
    Liu, Chang
    Chen, Ting
    He, Chunqing
    Fang, Pengfei
    Peng, Shaoxian
    Powiązania:
    https://bibliotekanauki.pl/articles/1033253.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    Acrylic coating
    UV irradiation
    positron annihilation spectroscopy
    Opis:
    Slow positron annihilation spectroscopy, contact angle and scanning electron microscope (SEM) were employed to investigate the surface polarity and morphologies as functions of aging time in acrylic coatings during UV-a irradiation. The S parameter plots of each exposed sample are lower than that of the virgin sample in the whole range of E. The S parameter plots become lower as the exposing longer time, indicated that the irradiation generated more polar groups and increased the oxidation layer depth. Combined with surface morphology and the surface energy of acrylic coating, the variation of contact angle, and surface energy, polar component and dispersive component is related with surface polarity and morphologies.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1527-1530
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Language learners’ emotion regulation and enjoyment in an online collaborative writing program
    Autorzy:
    Zhang, Zhipeng
    Gao, Xuesong (Andy)
    Liu, Ting
    Lee, Chwee Beng
    Powiązania:
    https://bibliotekanauki.pl/articles/2143628.pdf
    Data publikacji:
    2022-09-27
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    emotion regulation
    foreign language enjoyment
    online collaborative learning
    foreign language learners
    Opis:
    Collaborative learning in online contexts is emotionally challenging for language learners. To achieve successful learning outcomes, language learners need to regulate their emotions and sustain positive emotions during the collaborative learning process. This study investigated language learners’ emotion regulation and enjoyment, the most extensively researched positive emotion in foreign language learning, in an online collaborative English learning environment. In the study, we collected data by surveying 336 Chinese students majoring in English who collaboratively completed a series of English language writing tasks in 108 online groups facilitated by a social media app (WeChat). Principal component analysis revealed two primary types of emotion regulation: peer regulation and group regulation. The analysis also revealed one factor underpinning enjoyment: enjoyment of online collaboration. Correlation analysis showed medium and positive relationships between peer regulation, group regulation, and enjoyment of online collaboration. Structural equation modeling analysis further found that group regulation exerted a medium-sized direct effect on enjoyment of online collaboration. Peer regulation affected enjoyment of online collaboration moderately and indirectly via group regulation. The theoretical and pedagogical implications of the findings can help to optimize face-to-face and online collaborative language learning activities.
    Źródło:
    Studies in Second Language Learning and Teaching; 2022, 12, 3; 459-481
    2083-5205
    2084-1965
    Pojawia się w:
    Studies in Second Language Learning and Teaching
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of magnesium hydroxide by modifier-directed hydration and its effect on flame retardancy and mechanical properties of polypropylene
    Autorzy:
    Wang, Mei Jia
    Bai, Li Mei
    Zhang, Meng Ting
    Ma, Yu Xin
    Zhao, Liu Cheng
    Li, Shao Ying
    Powiązania:
    https://bibliotekanauki.pl/articles/27323651.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    modifier
    hydration preparation
    magnesium hydroxide
    polypropylene
    Opis:
    With the rapid development of the polymer materials industry and the improvement of people's environmental awareness, magnesium hydroxide has been widely used in polymer materials due to its high decomposition temperature, non-toxic smoke suppression, and the advantages of neutralizing harmful gases produced by polymer combustion. However, the conventional preparation methods of magnesium hydroxide exhibit several issues, including high hydrophilicity, elevated polarity, and limited compatibility with polymers. This research proposes an improved method by adding sodium stearate and KH560 modifier, controlling the rate of magnesium oxide and preparing magnesium hydroxide flame retardants using a modifier-directed hydration method. Various characterizations confirmed its morphology, particle size and structure. The magnesium hydroxide exhibits low polarity, small particle size, stable structure and excellent hydrophobicity (with a contact angle of 120.32°, and a free energy of 1.34mN/m). In parallel, the magnesium hydroxide/polypropylene composites demonstrate excellent flame retardancy (LOI of 25%, V-1 grade) and simultaneously enhance the dispersion of magnesium hydroxide within the polypropylene matrix, improving the material's toughness and strength.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 175706
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Curcumin Prevents Free Fatty Acid-Induced Lipid Accumulation via Targeting the miR-22-3p/CRLS1 Pathway in HepG2 Cells
    Autorzy:
    Mei, Yuanyuan
    Sun, Xiaoting
    Huang, Shi-Ying
    Wu, Xiaowen
    Ho, Kuo-Ting
    Lu, Liming
    Chen, Chaoxiang
    Li, Jian
    Liu, Jingwen
    Li, Guiling
    Powiązania:
    https://bibliotekanauki.pl/articles/28408450.pdf
    Data publikacji:
    2024-02-13
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    polyphenol
    epigenetics
    liver
    steatosis
    mitochondria
    Opis:
    Dysregulated lipid metabolism in liver is an important hallmark of non-alcoholic fatty liver disease (NAFLD), which may be modulated by dietary polyphenols or microRNAs (miRNAs). However, the underlying epigenetic regulatory mechanism of polyphenols remain unclear. The current study aimed to address how miRNA mediates hepatic lipid metabolic control of curcumin, a polyphenolic food supplement. The results showed that 24 h treatment with 5 - 20 μM curcumin prevented free fatty acid-induced lipid accumulation by around 10 ~ 50% in HepG2 cells, which was attenuated by pre-transfection with 40 nM miR-22-3p mimic for 48 h. In consequence, transfection with 40 nM miR-22-3p inhibitor for 48 h significantly reduced lipid accumulation by around 10%. And 48 h overexpression of miR-22-3p targeting cardiolipin synthase 1 (CRLS1) gene, which encodes a mitochondrial phospholipid synthase, showed a similar regulatory effect. Thus, miR-22-3p and CRLS1 showed opposite effects in modulating lipid metabolism, which probably involved mitochondrial control. In summary, this study demonstrated that curcumin improved hepatic lipid metabolism via targeting the miR-22-3p/CRLS1 pathway. Identification of the epigenetic regulatory mechanism underlying lipid metabolism may thereby facilitate alleviation of metabolic disorders by natural polyphenols.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2024, 74, 1; 59-68
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nitrogen-doped Carbon Catalyst by Ultrasonic for Electrocatalytic CO2 Reduction
    Autorzy:
    Liu, Jianfeng
    Wang, Ting
    Zhang, Zhenhai
    Ning, Kai
    Yin, Shibin
    Yuan, Binxia
    Powiązania:
    https://bibliotekanauki.pl/articles/780079.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Nitrogen-doped
    Catalyst
    Ultrasonic
    CO2 Reduction
    Opis:
    The electrocatalytic reduction of carbon dioxide into valued chemicals such as formic acid has the most promising potential in applying renewable energy for useful materials and mitigating the greenhouse effect. However, the studies still focus on developing catalysts with low price and high catalytic properties. In this study, nitrogen atoms were decorated into carbon structure by a unique ultrasonic method, then the nitrogen-doped carbon material was applied as catalyst in CO2 reduction, it exhibited excellent electrochemical activity, 4 times higher than the normal method. The improved activity should be attributed to the interaction between nitrogen and carbon atoms through analysis.
    Źródło:
    Polish Journal of Chemical Technology; 2020, 22, 3; 24-28
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Oxygen Reduction Activity of Nitrogen-doped Graphene
    Autorzy:
    Jian-feng, Liu
    Ge, Sun
    Ting, Wang
    Kai, Ning
    Bin-xia, Yuan
    Wei-guo, Pan
    Powiązania:
    https://bibliotekanauki.pl/articles/2174819.pdf
    Data publikacji:
    2022
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Nitrogen Doping
    Graphene
    Oxygen Reduction Activity
    Molecular Simulation
    Opis:
    Graphite nitrogen, pyridine nitrogen and pyrrole nitrogen are the main nitrogen types in nitrogen-doped graphene materials. In order to investigate the mechanism of the oxygen reduction activity of nitrogen-doped graphene, several models of nitrogen-doped graphene with different nitrogen contents and different nitrogen types are developed. The nitrogen content is varied from 1.3 at% to 7.8 at%, and the adsorption energy is calculated according to the established models, then the band gaps are analyzed through the optimization results, so as to compare the mag-nitude of the conductivity. Finally, the oxygen reduction activity of graphite nitrogen-doped graphene (GNG) is found to be better than pyridine nitrogen-doped graphene (PDNG) and pyrrole nitrogen-doped graphene (PLNG) when the nitrogen content is lower than 2.6 at%, and the oxygen reduction activity of PDNG is the best when the nitrogen content was higher than 2.6 at%.
    Źródło:
    Polish Journal of Chemical Technology; 2022, 24, 3; 29--34
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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