33 research outputs found

    High Efficient Photodegradation and Photocatalytic Hydrogen Production of CdS/BiVO<sub>4</sub> Heterostructure through <i>Z</i>‑Scheme Process

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    Novel heterostructured CdS/BiVO<sub>4</sub> nanocomposites were fabricated in a low-temperature water bath system. The uniform CdS nanoparticles with an average size of 20 nm were homogeneously interspersed on BiVO<sub>4</sub> nanosheets. The coupling of BiVO<sub>4</sub> and CdS nanoparticles could notably promote the photocatalytic activity. The composites reached a high H<sub>2</sub>-production rate of 0.57 mmol h<sup>–1</sup> under visible light irradiation, about 5.18 times higher than that of pure CdS nanoparticles. The dominant active species in the photocatalytic system were also confirmed by the radical trapping test. Based on the calculation and experimental results, a <i>Z</i>-scheme photocatalytic mechanism was proposed, which was further confirmed by the electrochemical impedance spectroscopy and the cycling test. The <i>Z</i>-scheme photocatalytic system endows the CdS/BiVO<sub>4</sub> heterostructure with strong reducibility and oxidizability and excellent stability

    Magnetically Separable CdS/ZnFe<sub>2</sub>O<sub>4</sub> Composites with Highly Efficient Photocatalytic Activity and Photostability under Visible Light

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    Novel CdS/ZnFe<sub>2</sub>O<sub>4</sub> composites were prepared through a two-step hydrothermal process. The homogeneous ZnFe<sub>2</sub>O<sub>4</sub> nanoparticles are decorated on the self-assembled CdS spheres. Compared to those of pure CdS and blank ZnFe<sub>2</sub>O<sub>4</sub>, the photocatalytic activity and stability of the magnetically separable CdS/ZnFe<sub>2</sub>O<sub>4</sub> composites are considerably increased. The results of photoluminescence and electrochemical impedance spectroscopy further validate that the performance enhancement results from the construction of heterojunction structure, leading to high charge separation efficiency. On the basis of the calculation and the trapping test, a heterojunction photocatalytic mechanism is proposed

    Association between Telomere Length and Type 2 Diabetes Mellitus: A Meta-Analysis

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    <div><p>Background</p><p>Several epidemiological studies have examined the association between shortened telomere length and type 2 diabetes mellitus (T2DM), while the results remained conflicting. We conducted a meta-analysis to derive a more precise estimation of the relationship between them.</p><p>Methods</p><p>We systematically reviewed the databases of PubMed, EMBASE, and Web of Science for all studies on the association between telomere length and T2DM. We conducted this study assessed by STATA 11.0. Data were summarized using random-effects or fixed-effects meta-analysis. The heterogeneity and publication bias among studies were examined by using χ<sup>2</sup>-based Q statistic test and Egger’s test, respectively.</p><p>Results</p><p>Nine cohorts consisting of 5759 cases and 6518 controls were selected into the meta-analysis. The results indicated that shortened telomere length was significantly associated with T2DM risk (OR: 1.291; 95% CI: 1.112, 1.498; <i>P</i><0.001) with heterogeneity (<i>I<sup>2</sup> = </i>71.6%). When three cohorts responsible for the heterogeneity were excluded, the pooled OR for the remaining cohorts indicated a significant association between shortened telomere length and T2DM (OR: 1.117; 95% CI: 1.002, 1.246; <i>P</i> = 0.045) without heterogeneity.</p><p>Conclusion</p><p>We found a statistically significant association between shortened telomere length and T2DM.</p></div

    Atomic-Scale Mechanisms of Sliding along an Interdiffused Li–Si–Cu Interface

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    We perform ab initio calculations on the shear deformation response of the interdiffused Li–Si–Cu phase structure existing between a lithiated Si electrode and a Cu current collector. We show that the formation of well-delineated and weakly bonded Si–Cu and Li–Cu crystalline atomic layers within this phase structure facilitates interface sliding. However, sliding can be terminated by the formation of LiSi<sub>3</sub> compounds across these atomic layers, which causes the abrupt capacity fade of the electrode after repeated cycling

    Characteristics of studies examining the association between telomere length and T2DM included in the meta-analysis.

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    <p>Characteristics of studies examining the association between telomere length and T2DM included in the meta-analysis.</p

    Sensitivity analyses of selected studies.

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    <p>Each line showed the recalculated pooled relative risk of remaining studies by omitting one study listed in the left volume a time.</p

    Subgroup analyses of the meta-analysis.

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    <p>NA, not applicable;</p>*<p>After excluding the key contributor studies to heterogeneity (Studies of Xiao <i>et al</i>, Shen <i>et al</i> and Salpea <i>et al</i>).</p

    Flow chart for the process of selecting eligible publications.

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    <p>Flow chart for the process of selecting eligible publications.</p

    Additional file 1: of Study of spontaneous mutations in the transmission of poplar chloroplast genomes from mother to offspring

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    Table S1. The ratio of split-reads mapped to each cpDNA of six Populus species using Bowtie and BWA. Table S2. The genome size of P. trichocarpa cpDNA was estimated using each of twelve sets of simulated reads (60 bp–10 k, 60 bp–100 k, 60 bp–1 M, 60 bp–10 M, 80 bp–10 k, 80 bp–100 k, 80 bp–1 M, 80 bp–10 M, 100 bp–10 k, 100 bp–100 k, 100 bp–1 M and 100 bp–10 M). Table S3. Basic statistics of 13 assemblies used for further analyses. Table S4. The cpDNA and gDNA ratios of read datasets for the three poplar clones I45, I69 and NL895. Table S5. The positions, reference and alternative base, types (Replace|Insert|Delete) and the genotypes of all 401 variants identified in the three poplar clones. (XLSX 31 kb
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