排序方式: 共有100条查询结果,搜索用时 203 毫秒
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Faming Wu Jie Peng Junfeng Ran Yubo Tian Xiang Li Yan Ren Rongyin Gai Yunying Zhang 《化学与生物多样性》2023,20(2):e202200563
As a highly representative traditional Chinese anti-tumor medicinal material, the biomass of Mylabris is collected from the wild. However, the living environments of Mylabris is differ, so Mylabris may be contaminated by heavy metal pollution depending on the environment. These environments may also affect the amount of biosynthesis of its medicinal ingredient, cantharidin, there by affecting the quality of Mylabris. In this study, we determined the heavy metal content in Mylabris from different origins by using ICP-MS, evaluated the risk posed by these heavy metals, and recommended theoretical maximum limits of heavy metals in medicinal Mylabris. The results show that the Cu content in Mylabris is substantially higher than that in Cr, As, Pb, Cd, and Hg. A quantitative risk assessment showed that Mylabris poses no noncarcinogenic risks. The results of the total carcinogenic risk value showed that origins S12 and S13 pose carcinogenic risk by Cr and As, and the rest of the origins were in the human-tolerable carcinogenic risk range. We found large differences in the cantharidin content in Mylabris from different origins. In general, the Mylabris from origins S2, S3 and S4 had a higher in vivo cantharidin content, which proved that the quality of the medicinal materials was higher here than in other production areas. Finally, we providing a reference for the quality evaluation of medicinal Mylabris materials. 相似文献
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Summary Clustering is a widely used method in extracting useful information from gene expression data, where unknown correlation structures in genes are believed to persist even after normalization. Such correlation structures pose a great challenge on the conventional clustering methods, such as the Gaussian mixture (GM) model, k‐means (KM), and partitioning around medoids (PAM), which are not robust against general dependence within data. Here we use the exponential power mixture model to increase the robustness of clustering against general dependence and nonnormality of the data. An expectation–conditional maximization algorithm is developed to calculate the maximum likelihood estimators (MLEs) of the unknown parameters in these mixtures. The Bayesian information criterion is then employed to determine the numbers of components of the mixture. The MLEs are shown to be consistent under sparse dependence. Our numerical results indicate that the proposed procedure outperforms GM, KM, and PAM when there are strong correlations or non‐Gaussian components in the data. 相似文献
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Zhou Jinge Zhang Jingfan Lambers Hans Wu Jingtao Qin Guoming Li Yingwen Li Yongxing Li Zhian Wang Jun Wang Faming 《Plant and Soil》2022,476(1-2):337-351
Plant and Soil - Precipitation patterns in the tropics of southern China are predicted to change with an increase of the rainfall in the wet season (WW) and a delay of the wet season into autumn... 相似文献
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Faming Wang Simona Del Ferraro Vincenzo Molinaro Matthew Morrissey René Rossi 《International journal of biometeorology》2014,58(7):1673-1682
Regional sweating patterns and body surface temperature differences exist between genders. Traditional sportswear made from one material and/or one fabric structure has a limited ability to provide athletes sufficient local wear comfort. Body mapping sportswear consists of one piece of multiple knit structure fabric or of different fabric pieces that may provide athletes better wear comfort. In this study, the ‘modular’ body mapping sportswear was designed and subsequently assessed on a ‘Newton’ type sweating manikin that operated in both constant temperature mode and thermophysiological model control mode. The performance of the modular body mapping sportswear kit and commercial products were also compared. The results demonstrated that such a modular body mapping sportswear kit can meet multiple wear/thermal comfort requirements in various environmental conditions. All body mapping clothing (BMC) presented limited global thermophysiological benefits for the wearers. Nevertheless, BMC showed evident improvements in adjusting local body heat exchanges and local thermal sensations. 相似文献
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Clothing evaporative resistance is one of the inherent factors that impede heat exchange by sweating evaporation. It is widely
used as a basic input in physiological heat strain models. Previous studies showed a large variability in clothing evaporative
resistance both at intra-laboratory and inter-laboratory testing. The errors in evaporative resistance may cause severe problems
in the determination of heat stress level of the wearers. In this paper, the effect of temperature difference between the
manikin nude surface and wet textile skin surface on clothing evaporative resistance was investigated by both theoretical
analysis and thermal manikin measurements. It was found that the temperature difference between the skin surface and the manikin
nude surface could lead to an error of up to 35.9% in evaporative resistance of the boundary air layer. Similarly, this temperature
difference could also introduce an error of up to 23.7% in the real clothing total evaporative resistance (R
et_real
< 0.1287 kPa m2/W). Finally, it is evident that one major error in the calculation of evaporative resistance comes from the use of the manikin
surface temperature instead of the wet textile fabric skin temperature. 相似文献
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