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基于优化MaxEnt模型的中国紫堇属植物生境适宜性研究
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作者 陈程浩 龙主多杰 +4 位作者 陆徐伟 宋扎磋 苗琪 孙芳慧 索南吉 《生态学报》 CAS CSCD 北大核心 2023年第24期10345-10362,共18页
气候变化正深刻地影响着植物的地理分布格局,预测紫堇属植物的潜在适生区有利于认识气候变化对紫堇属植物分布的影响,对制定紫堇属植物的保护策略具有重要意义。以紫堇属植物作为研究对象,基于优化的MaxEnt模型,对1910个紫堇属植物分布... 气候变化正深刻地影响着植物的地理分布格局,预测紫堇属植物的潜在适生区有利于认识气候变化对紫堇属植物分布的影响,对制定紫堇属植物的保护策略具有重要意义。以紫堇属植物作为研究对象,基于优化的MaxEnt模型,对1910个紫堇属植物分布点和22个环境因子进行潜在适生区预测,探讨影响紫堇属植物分布的主要环境因子,并预测其在末次盛冰期(last glacial maximum,LGM)、当代(Current)、未来2021—2040年(2040s)、2041—2060年(2060s)、2061—2080年(2080s)和2081—2100年(2100s)2种温室气体排放浓度场景(SSP126和SSP585)下的潜在适生区的空间分布格局及其质心迁移趋势,最后对其保护现状进行了分析。结果表明:(1)最优化模型参数组合为RM=1.4,FC=LQPT,此时MaxEnt模型的复杂度和过拟合都最低,模型预测精度较高,AUC=0.793;(2)由刀切法贡献率、置换贡献率和单因子响应曲线可知影响紫堇属植物地理分布的主要环境因子为气温年较差(bio7)、气温季节性变动系数(bio4)、年降水量(bio12)、平均气温日较差(bio2),其中温度是影响紫堇属植物分布的最重要环境因子;(3)当前气候条件下紫堇属植物分布的范围几乎涵盖整个中国,在气候分区上看,从北亚热带、南亚热带、中温带、南温带及高原气候区均有分布。然而,各个时期间紫堇属植物的潜在适生区变化较大,其潜在适生区总体呈现向高原气候区及中温带地区扩张的趋势,且面积不断扩大;随着温室气体浓度的增加,适生区的破碎化逐渐严重。质心迁移结果也表明紫堇属植物在未来的潜在适生区总体呈现向西北移动的趋势;(4)我国东喜马拉雅地区及横断山区为紫堇属植物保护的关键地区,然而该地区自然保护区面积较小且破碎化严重,亟待对该地区的紫堇属植物进行保护,同时也应继续加强西北地区自然保护区的建设。 展开更多
关键词 气候变化 物种适应性 物种分布格局 青藏高原 紫堇属
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Establishment and Application of A Human Primary Keratinocyte Inflammation Model for Cosmetic Raw Material Screening
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作者 sun fanghui Song Xiaojie Huo gang 《China Detergent & Cosmetics》 CAS 2023年第3期58-62,共5页
Using inducers to induce cells to produce inflammatory response is a common in vitro experimental method to study inflammation.However,there are relatively few inflammatory models developed for the cosmetic industry,a... Using inducers to induce cells to produce inflammatory response is a common in vitro experimental method to study inflammation.However,there are relatively few inflammatory models developed for the cosmetic industry,and there are also great differences in the control of model induction,the selection of inflammatory indicators,and the concentration of inducers.Therefore,in this paper,by systematically studying the effects of Lipopolysaccharide(LPS)on the cell viability,the levels of IL-1α,IL-8 and ROS of human primary keratinocytes,a skin inflammation model based human primary keratinocyte was developed.The results showed that 0.01~100μg/mL LPS had no significant effect on the cell viability of human primary keratinocytes,while 100μg/mL LPS could simultaneously induce human primary keratinocytes to produce large amounts of IL-1αand IL-8,and 0.01μg/mL LPS could induce plentiful ROS.Therefore,a skin inflammation model for differential induction of different inflammatory indicators was established,and the sample OSM2021041301 was tested with this model,it was found that sample OSM2021041301 could significantly inhibit LPS-induced elevated IL-1αand IL-8 levels,the inhibitory effect on LPS-induced elevated ROS level was weak.The results indicated that OSM2021041301 has certain anti-inflammatory effect on inflammation caused by the increase of IL-1α,IL-8 and ROS induced by LPS and its analogues. 展开更多
关键词 LPS human primary keratinocytes inflammation model IL-1Α IL-8 ROS
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