LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 6 of total 6

Search options

  1. Article ; Online: Integrated transcriptome and metabolome analysis provide insights into the mechanism of saponin biosynthesis and its role in alleviating cadmium-induced oxidative damage in Ophiopogon japonicum.

    Zhao, Qian / Wang, Jie / Li, Qing / Zhang, Jiarong / Hou, Ruijun / Wang, Zhihui / Zhu, Qian / Zhou, Yifeng / Chen, Yue / Huang, Jun

    Plant physiology and biochemistry : PPB

    2024  Volume 210, Page(s) 108634

    Abstract: Zhe-Maidong, a cultivar of Ophiopogon japonicus is a prominent traditional herbal medicine rich in saponins. This study explored the mechanism of saponin biosynthesis and its role in alleviating Cd-induced oxidative damage in the Zhe-Maidong cultivar ... ...

    Abstract Zhe-Maidong, a cultivar of Ophiopogon japonicus is a prominent traditional herbal medicine rich in saponins. This study explored the mechanism of saponin biosynthesis and its role in alleviating Cd-induced oxidative damage in the Zhe-Maidong cultivar using three experimental groups undergoing Cd stress. In the Cd-contaminated soil treatment, total saponins were 1.68 times higher than those in the control. The saponin content in the Cd-2 and Cd-3 treatments was approximately twice as high as that in the Cd-CK treatment. These findings revealed that Cd stress leads to total saponin accumulation. Metabolomic analysis identified the accumulated saponins, primarily several monoterpenoids, diterpenoids, and triterpenoids. The increased saponins exhibited an antioxidant ability to prevent the accumulation of Cd-induced reactive oxygen species (ROS). Subsequent saponin application experiments provided strong evidence that saponin played a crucial role in promoting superoxide dismutase (SOD) activity and reducing ROS accumulation. Transcriptome analysis revealed vital genes for saponin synthesis under Cd stress, including SE, two SSs, and six CYP450s, positively correlated with differentially expressed metabolite (DEM) levels in the saponin metabolic pathway. Additionally, the TF-gene regulatory network demonstrated that bHLH1, bHLH3, mTERF, and AUX/IAA transcript factors are crucial regulators of hub genes involved in saponin synthesis. These findings significantly contribute to our understanding of the regulatory network of saponin synthesis and its role in reducing oxidative damage in O. japonicum when exposed to Cd stress.
    Language English
    Publishing date 2024-04-17
    Publishing country France
    Document type Journal Article
    ZDB-ID 742978-2
    ISSN 1873-2690 ; 0981-9428
    ISSN (online) 1873-2690
    ISSN 0981-9428
    DOI 10.1016/j.plaphy.2024.108634
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 2696: Show issues
    Z 2005/727: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  2. Article: Identification and characterization of the critical genes encoding Cd-induced enhancement of SOD isozymes activities in Zhe-Maidong (

    Hou, Ruijun / Wang, Zhihui / Zhu, Qian / Wang, Jie / Zhou, Yifeng / Li, Ye / Liu, Huijun / Zhao, Qian / Huang, Jun

    Frontiers in plant science

    2024  Volume 15, Page(s) 1355849

    Abstract: Superoxide dismutase (SOD) protects plants from abiotic stress-induced reactive oxygen species (ROS) damage. Here, the effects of cadmium (Cd) exposure on ROS accumulation and SOD isozymes, as well as the identification of significant SOD isozyme genes, ... ...

    Abstract Superoxide dismutase (SOD) protects plants from abiotic stress-induced reactive oxygen species (ROS) damage. Here, the effects of cadmium (Cd) exposure on ROS accumulation and SOD isozymes, as well as the identification of significant SOD isozyme genes, were investigated under different Cd stress treatments to Zhe-Maidong (
    Language English
    Publishing date 2024-03-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2024.1355849
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  3. Article: Tuning butene selectivities by Cu modification on Pd-based catalyst for the selective hydrogenation of 1,3-butadiene

    Yang, Qiuchen / Hou, Ruijun / Sun, Kening

    Journal of catalysis. 2019 June, v. 374

    2019  

    Abstract: Pd-based bimetallic catalysts have shown unique selectivity to alkenes in the selective hydrogenation reactions, but often at the expense of activity. Therefore, the modification by a non-precious metal with similar or increased activity is crucial in ... ...

    Abstract Pd-based bimetallic catalysts have shown unique selectivity to alkenes in the selective hydrogenation reactions, but often at the expense of activity. Therefore, the modification by a non-precious metal with similar or increased activity is crucial in lowering the catalyst cost. In the current study, γ-Al2O3 supported Pd–Cu catalysts with different metal ratios were investigated in the selective hydrogenation of 1,3-butadiene. The adsorption properties of hydrogen and C4 species over model surfaces Pd(1 1 1), Pd1Cu3(1 1 1) and Cu(1 1 1) were studied by DFT calculations, and it was predicted that the Pd–Cu bimetallic catalysts should be more selective to butenes than the Pd monometallic catalyst. Moreover, the γ-Al2O3 supported Pd–Cu catalysts were prepared by incipient wetness co-impregnation, and were characterized by TEM, CO pulse titration, TPR, N2O chemisorption, FT-IR of adsorbed CO and XPS; the catalytic study was performed in a fixed-bed reactor as well as in a batch reactor equipped with FT-IR. By the addition of Cu, Pd active sites were diluted, and the particle sizes were reduced. The Pd–Cu bimetallic catalysts exhibited surprisingly higher activity than Pd at low temperatures. In consistent with the DFT results, Pd–Cu bimetallic catalysts showed higher selectivities to total butenes and 1-butene. By analyzing the characterization and the hydrogenation test results, the electronic effect and geometric effect should be responsible in enhancing activity and tuning selectivity.
    Keywords C4 plants ; Fourier transform infrared spectroscopy ; X-ray photoelectron spectroscopy ; active sites ; adsorption ; alkenes ; carbon monoxide ; catalysts ; copper ; geometry ; hydrogen ; hydrogenation ; nitrous oxide ; palladium ; particle size ; temperature ; titration ; transmission electron microscopy
    Language English
    Dates of publication 2019-06
    Size p. 12-23.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 1468993-5
    ISSN 0021-9517
    ISSN 0021-9517
    DOI 10.1016/j.jcat.2019.04.018
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Article: Role of acid sites and surface hydroxyl groups in isophthalonitrile hydrogenation catalyzed by supported Ni–Co catalysts

    Liu, Chang / Hou, Ruijun / Wang, Tiefeng

    RSC advances. 2015 Mar. 17, v. 5, no. 34

    2015  

    Abstract: meta-Xylylenediamine (m-XDA) is industrially produced by the hydrogenation of isophthalonitrile (IPN) using Raney® Ni/Co and basic additives. Compared with Raney® Ni/Co, the supported Ni/Co catalysts are safer and have better mechanical strength. This ... ...

    Abstract meta-Xylylenediamine (m-XDA) is industrially produced by the hydrogenation of isophthalonitrile (IPN) using Raney® Ni/Co and basic additives. Compared with Raney® Ni/Co, the supported Ni/Co catalysts are safer and have better mechanical strength. This work aimed at studying the catalytic performance of the supported Ni–Co catalysts in hydrogenation of IPN to m-XDA. The active sites for the condensation side reactions were studied using Ni–Co catalysts supported on different oxides and with different loadings. It was found that the acid sites catalyzed the condensation reactions between intermediate imines and amines. Two types of acid sites existed on the supported Ni–Co catalysts, namely, the original acid sites of the support and new acid sites formed by Ni/Co aluminates. In addition to acid sites, the surface hydroxyl groups on the oxide supports also catalyzed the condensation reactions, but were not active for the hydrogenation reaction. By increasing the Ni–Co loading, the selectivity to m-XDA was significantly enhanced, which was attributed to the suppression of both acid sites and hydroxyl groups. Compared to the low-loading catalysts (5Ni–1.25Co/Al2O3 and 5Ni–1.25Co/SiO2), the high-loading catalysts (20Ni–5Co/Al2O3 and 20Ni–5Co/SiO2) increased the m-XDA selectivity from ∼45.5 to 99.9%.
    Keywords active sites ; additives ; aluminum oxide ; amines ; catalysts ; catalytic activity ; cobalt ; condensation reactions ; hydrogenation ; imines ; moieties ; nickel ; silica ; strength (mechanics)
    Language English
    Dates of publication 2015-0317
    Size p. 26465-26474.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/c5ra01007a
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Article: Enhanced Selectivity in the Hydrogenation of Acetylene due to the Addition of a Liquid Phase as a Selective Solvent

    Hou, Ruijun / Lan Xiaocheng / Wang Tiefeng

    Industrial & Engineering Chemistry Research. 2013 Sept. 18, v. 52, no. 37

    2013  

    Abstract: The selective hydrogenation of acetylene is usually a gas-phase reaction. In this work, a liquid phase was introduced as a selective solvent to improve the selectivity to ethylene by coupling absorption to the reaction. The catalyst was 0.01% Pd ... ...

    Abstract The selective hydrogenation of acetylene is usually a gas-phase reaction. In this work, a liquid phase was introduced as a selective solvent to improve the selectivity to ethylene by coupling absorption to the reaction. The catalyst was 0.01% Pd supported on a low surface area silica. N-methyl-2-pyrrolidone (NMP) was used as a selective solvent, and decane was used as a nonselective solvent for comparison. The liquid-phase hydrogenation was carried out in a stirred flat bottom flask operated in gas continuous and liquid batch mode, and the gas-phase hydrogenation was carried out in a fixed bed reactor. The selectivity to ethylene in the gas-phase hydrogenation was 50–70%. In contrast, the highest selectivity to ethylene in the NMP liquid-phase hydrogenation was increased to 96%, while in decane it had the same value as in the gas phase. In NMP, a low reaction temperature below 80 °C did not give a high selectivity to ethylene because the relatively high ethylene solubility in NMP led to deep hydrogenation and the high acetylene solubility caused more oligomerization. Good catalyst stability was obtained under the optimized conditions of a relatively low space velocity, H₂:C₂H₂ ratio above 10, and reaction temperature above 80 °C. Significant deactivation also occurred in NMP under other conditions due to oligomerization.
    Keywords absorption ; catalysts ; decane ; ethylene ; gases ; hydrogenation ; liquids ; oligomerization ; silica ; solubility ; solvents ; surface area ; temperature
    Language English
    Dates of publication 2013-0918
    Size p. 13305-13312.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 1484436-9
    ISSN 1520-5045 ; 0888-5885
    ISSN (online) 1520-5045
    ISSN 0888-5885
    DOI 10.1021%2Fie303630p
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  6. Article: Selective hydrogenation of 1,3-butadiene on PdNi bimetallic catalyst: From model surfaces to supported catalysts

    Hou, Ruijun / Jingguang G. Chen / Marc D. Porosoff / Tiefeng Wang / Weiting Yu

    Journal of catalysis. 2014 July, v. 316

    2014  

    Abstract: The selective hydrogenation of 1,3-butadiene serves as a means to purify the butene stream generated from cracking naphtha or gas oil. To identify selective hydrogenation catalysts, 1,3-butadiene was studied on single crystal Ni/Pd(111) bimetallic ... ...

    Abstract The selective hydrogenation of 1,3-butadiene serves as a means to purify the butene stream generated from cracking naphtha or gas oil. To identify selective hydrogenation catalysts, 1,3-butadiene was studied on single crystal Ni/Pd(111) bimetallic surfaces, utilizing density functional theory (DFT) calculations and temperature-programmed desorption (TPD). DFT calculations predicted that the Pd-terminated bimetallic surface should be more active and selective to produce 1-butene, which were verified experimentally using TPD. The promising results on model surfaces were extended to γ-Al2O3-supported catalysts using both batch and flow reactors. Extended X-ray absorption fine structure (EXAFS) and transmission electron microscopy (TEM) confirmed the formation of bimetallic nanoparticles. The PdNi bimetallic catalyst showed higher hydrogenation activity and 1-butene selectivity than the monometallic catalysts. The excellent correlation between model surfaces and supported catalysts demonstrates the feasibility of designing effective bimetallic catalysts for selective hydrogenation reactions.
    Keywords catalysts ; cracking ; density functional theory ; desorption ; fuel oils ; hydrogenation ; models ; nanoparticles ; nickel ; transmission electron microscopy ; X-radiation
    Language English
    Dates of publication 2014-07
    Size p. 1-10.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 1468993-5
    ISSN 0021-9517
    ISSN 0021-9517
    DOI 10.1016/j.jcat.2014.04.015
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

To top