21 research outputs found

    Tailor-Made Core–Shell CaO/TiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> Architecture as a High-Capacity and Long-Life CO<sub>2</sub> Sorbent

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    CaO-based sorbents are widely used for CO<sub>2</sub> capture, steam methane reforming, and gasification enhancement, but the sorbents suffer from rapid deactivation during successive carbonation/calcination cycles. This research proposes a novel self-assembly template synthesis (SATS) method to prepare a hierarchical structure CaO-based sorbent, Ca-rich, Al<sub>2</sub>O<sub>3</sub>-supported, and TiO<sub>2</sub>-stabilized in a core–shell microarchitecture (CaO/TiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>). The cyclic CO<sub>2</sub> capture performance of CaO/TiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> is compared with those of pure CaO and CaO/Al<sub>2</sub>O<sub>3</sub>. CaO/TiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> sorbent achieved superior and durable CO<sub>2</sub> capture capacity of 0.52 g CO<sub>2</sub>/g sorbent after 20 cycles under the mild calcination condition and retained a high-capacity and long-life performance of 0.44 g CO<sub>2</sub>/g sorbent after 104 cycles under the severe calcination condition, much higher than those of CaO and CaO/Al<sub>2</sub>O<sub>3</sub>. The microstructure characterization of CaO/TiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> confirmed that the core–shell structure of composite support effectively inhibited the reaction between active component (CaO particles) and main support (Al<sub>2</sub>O<sub>3</sub> particles) by TiO<sub>2</sub> addition, which contributed to its properties of high reactivity, thermal stability, mechanical strength, and resistance to agglomeration and sintering

    Investigation and Analysis of Genetic Diversity of Diospyros Germplasms Using SCoT Molecular Markers in Guangxi

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    <div><p>Background</p><p>Knowledge about genetic diversity and relationships among germplasms could be an invaluable aid in diospyros improvement strategies.</p><p>Methods</p><p>This study was designed to analyze the genetic diversity and relationship of local and natural varieties in Guangxi Zhuang Autonomous Region of China using start codon targeted polymorphism (SCoT) markers. The accessions of 95 diospyros germplasms belonging to four species <i>Diospyros kaki</i> Thunb, <i>D</i>. <i>oleifera</i> Cheng, <i>D</i>. <i>kaki</i> var. <i>silverstris</i> Mak, and <i>D</i>. <i>lotus</i> Linn were collected from different eco-climatic zones in Guangxi and were analyzed using SCoT markers.</p><p>Results</p><p>Results indicated that the accessions of 95 diospyros germplasms could be distinguished using SCoT markers, and were divided into three groups at similarity coefficient of 0.608; these germplasms that belong to the same species were clustered together; of these, the degree of genetic diversity of the natural <i>D</i>. <i>kaki</i> var. <i>silverstris</i> Mak population was richest among the four species; the geographical distance showed that the 12 natural populations of <i>D</i>. <i>kaki</i> var. <i>silverstris</i> Mak were divided into two groups at similarity coefficient of 0.19. Meanwhile, in order to further verify the stable and useful of SCoT markers in diospyros germplasms, SSR markers were also used in current research to analyze the genetic diversity and relationship in the same diospyros germplasms. Once again, majority of germplasms that belong to the same species were clustered together. Thus SCoT markers were stable and especially useful for analysis of the genetic diversity and relationship in diospyros germplasms.</p><p>Discussion</p><p>The molecular characterization and diversity assessment of diospyros were very important for conservation of diospyros germplasm resources, meanwhile for diospyros improvement.</p></div

    Diospyros germplasm resources and their respective localities.

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    <p>Note: The germplasms that have not been previously reported, or whose names are not sure were temporarily named after the first letter of their localities and numbers.</p><p>Diospyros germplasm resources and their respective localities.</p

    UPGMA dendrogram of the natural <i>D</i>. <i>kaki var</i>. <i>silvestris</i> Mak populations based on Nei’s genetic distance.

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    <p>UPGMA dendrogram of the natural <i>D</i>. <i>kaki var</i>. <i>silvestris</i> Mak populations based on Nei’s genetic distance.</p

    Results of analysis of the genetic diversity of the 12 natural <i>D</i>. <i>kaki</i> var. <i>silverstris</i> Mak. populations.

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    <p>Results of analysis of the genetic diversity of the 12 natural <i>D</i>. <i>kaki</i> var. <i>silverstris</i> Mak. populations.</p

    UPGMA dendrogram of the accessions of 95 diospyros germplasms based on SSR molecular markers.

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    <p>UPGMA dendrogram of the accessions of 95 diospyros germplasms based on SSR molecular markers.</p

    The localities of the natural <i>D</i>. <i>kaki var</i>. <i>silvestris</i> Mak samples.

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    <p>The localities of the natural <i>D</i>. <i>kaki var</i>. <i>silvestris</i> Mak samples.</p

    Analysis of molecular variance (AMOVA) within and among natural <i>D</i>. <i>kaki</i> var. <i>silvestris</i> Mak. populations.

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    <p>Note: MSD,expected mean squares</p><p>*Number of permutation = 1,000</p><p>Analysis of molecular variance (AMOVA) within and among natural <i>D</i>. <i>kaki</i> var. <i>silvestris</i> Mak. populations.</p
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