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  1. Artikel ; Online: Titanium-Catalyzed Exhaustive Reduction of Oxo-Chemicals.

    Han, Bo / Ren, Chunping / Jiang, Min / Wu, Lipeng

    Angewandte Chemie (International ed. in English)

    2022  Band 61, Heft 46, Seite(n) e202209232

    Abstract: Catalytic reduction of carboxylic acids and derivatives all the way to their corresponding methyl-compounds is very rare and still challenging for homogeneous transition-metal catalysis. Herein, we report an unprecedented and general catalytic exhaustive ...

    Abstract Catalytic reduction of carboxylic acids and derivatives all the way to their corresponding methyl-compounds is very rare and still challenging for homogeneous transition-metal catalysis. Herein, we report an unprecedented and general catalytic exhaustive reduction of carboxylic functional group straightforwardly to a methyl group. This reaction was achieved using earth-abundant and readily available titanium as a catalyst. Our system has broad functional group tolerance and works for various other types of oxo-chemicals such as alcohols, aldehydes, ketones, lactones, and carboxylates (>100 examples). Preliminary mechanistic studies revealed that the in situ-generated Ti
    Sprache Englisch
    Erscheinungsdatum 2022-10-17
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202209232
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel: Effects of

    Ji, Lili / Wang, Shu / Zhou, Yanan / Nie, Qing / Zhou, Chunyan / Ning, Jiawen / Ren, Chunping / Tang, Chun / Zhang, Jiamin

    Foods (Basel, Switzerland)

    2024  Band 13, Heft 3

    Abstract: Saccharomyces ... ...

    Abstract Saccharomyces cerevisiae
    Sprache Englisch
    Erscheinungsdatum 2024-01-25
    Erscheinungsland Switzerland
    Dokumenttyp Journal Article
    ZDB-ID 2704223-6
    ISSN 2304-8158
    ISSN 2304-8158
    DOI 10.3390/foods13030396
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: Si-B Functional Group Exchange Reaction Enabled by a Catalytic Amount of BH

    Zhang, Jiong / Wei, Rui / Ren, Chunping / Liu, Liu Leo / Wu, Lipeng

    Journal of the American Chemical Society

    2023  Band 145, Heft 28, Seite(n) 15619–15629

    Abstract: Functional group exchanges based on single-bond transformation are rare and challenging. In this regard, functional group exchange reactions of hydrosilanes proved to be more problematic. This is because this exchange requires the cleavage of the C-Si ... ...

    Abstract Functional group exchanges based on single-bond transformation are rare and challenging. In this regard, functional group exchange reactions of hydrosilanes proved to be more problematic. This is because this exchange requires the cleavage of the C-Si bond, while the Si-H bond is relatively easily activated for hydrosilanes. Herein, we report the first Si-B functional group exchange reactions of hydrosilanes with hydroboranes simply enabled by BH
    Sprache Englisch
    Erscheinungsdatum 2023-07-06
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.3c05625
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel ; Online: Total Nitrogen Sources of the Three Gorges Reservoir--A Spatio-Temporal Approach.

    Ren, Chunping / Wang, Lijing / Zheng, Binghui / Holbach, Andreas

    PloS one

    2015  Band 10, Heft 10, Seite(n) e0141458

    Abstract: Understanding the spatial and temporal variation of nutrient concentrations, loads, and their distribution from upstream tributaries is important for the management of large lakes and reservoirs. The Three Gorges Dam was built on the Yangtze River in ... ...

    Abstract Understanding the spatial and temporal variation of nutrient concentrations, loads, and their distribution from upstream tributaries is important for the management of large lakes and reservoirs. The Three Gorges Dam was built on the Yangtze River in China, the world's third longest river, and impounded the famous Three Gorges Reservoir (TGR). In this study, we analyzed total nitrogen (TN) concentrations and inflow data from 2003 till 2010 for the main upstream tributaries of the TGR that contribute about 82% of the TGR's total inflow. We used time series analysis for seasonal decomposition of TN concentrations and used non-parametric statistical tests (Kruskal-Walli H, Mann-Whitney U) as well as base flow segmentation to analyze significant spatial and temporal patterns of TN pollution input into the TGR. Our results show that TN concentrations had significant spatial heterogeneity across the study area (Tuo River> Yangtze River> Wu River> Min River> Jialing River>Jinsha River). Furthermore, we derived apparent seasonal changes in three out of five upstream tributaries of the TGR rivers (Kruskal-Walli H ρ = 0.009, 0.030 and 0.029 for Tuo River, Jinsha River and Min River in sequence). TN pollution from non-point sources in the upstream tributaries accounted for 68.9% of the total TN input into the TGR. Non-point source pollution of TN revealed increasing trends for 4 out of five upstream tributaries of the TGR. Land use/cover and soil type were identified as the dominant driving factors for the spatial distribution of TN. Intensifying agriculture and increasing urbanization in the upstream catchments of the TGR were the main driving factors for non-point source pollution of TN increase from 2003 till 2010. Land use and land cover management as well as chemical fertilizer use restriction were needed to overcome the threats of increasing TN pollution.
    Mesh-Begriff(e) China ; Environmental Monitoring ; Nitrogen/analysis ; Rivers/chemistry ; Spatio-Temporal Analysis
    Chemische Substanzen Nitrogen (N762921K75)
    Sprache Englisch
    Erscheinungsdatum 2015
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0141458
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel: Ten-year change of total phosphorous pollution in the Min River, an upstream tributary of the Three Gorges Reservoir

    Ren, Chunping / Lijing Wang / Binghui Zheng / Jun Qian / Hongjin Ton

    Environmental earth sciences. 2016 June, v. 75, no. 12

    2016  

    Abstract: Understanding the spatial and temporal variation of nutrient concentrations, loads and their distribution from upstream tributaries is important for management of large lakes and reservoirs. The Min River is an important tributary of the upper reaches of ...

    Abstract Understanding the spatial and temporal variation of nutrient concentrations, loads and their distribution from upstream tributaries is important for management of large lakes and reservoirs. The Min River is an important tributary of the upper reaches of the Three Gorges Reservoir (TGR) that contributes about 20 % of the inflow water from the Yangtze River to the TGR. It is also one of the main phosphorous sources of the TGR. In this study, total phosphorous (TP) concentrations and hydrological data from 2004 through 2014 for 13 sites in Min River and its tributaries were analyzed. The result suggested that the concentration of TP was comparatively lower in the upstream of the Min River and Dadu River, but tended to increase in recent years. Additionally, the TP pollution status in the Min River basin has gradually evolved from local pollution to whole-basin pollution. The concentration of TP in the Min River main stream increased, decreased and then increased again along the waterway. Pollution from nonpoint sources was the main contribution in the upstream portion and Outer River basin of Min River. Pollution from point sources was more serious than that from nonpoint sources in Chengdu, Meishan and Leshan segment. Specifically, TP pollution in Min River of Chengdu segment (Huanglongxi, Inner River) was primarily affected by urbanization, while Leshan segment (Yuebo) was mainly affected by glyphosate production. Controlling pollution from nonpoint sources and improving the sewage collection rate to reduce TP loads will be the primary task in the upstream portion and Outer River basin. Point source pollution controlling will still be the primary task associated with water quality management in the Inner River (Chengdu segment) and the downstream (Leshan segment) basin of Min River for the foreseeable future. Pollution from both point sources and nonpoint sources should be cared in the other area of Min River basin.
    Schlagwörter Meishan ; basins ; glyphosate ; hydrologic data ; lakes ; phosphorus ; point source pollution ; rivers ; sewage ; temporal variation ; urbanization ; water quality ; watersheds ; Yangtze River
    Sprache Englisch
    Erscheinungsverlauf 2016-06
    Umfang p. 1015.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 2493699-6
    ISSN 1866-6299 ; 1866-6280
    ISSN (online) 1866-6299
    ISSN 1866-6280
    DOI 10.1007/s12665-016-5789-9
    Datenquelle NAL Katalog (AGRICOLA)

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  6. Artikel: Ten-year change of total phosphorous pollution in the Min River, an upstream tributary of the Three Gorges Reservoir

    Ren, Chunping / Lijing Wangauthor / Binghui Zhengauthor / Jun Qianauthor / Hongjin Tonauthor
    Sprache Englisch
    Dokumenttyp Artikel
    Datenquelle AGRIS - International Information System for the Agricultural Sciences and Technology

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