目的:分析中药苍术的研究现状、热点和趋势。方法:以中国知网、万方数据库、PubMed和Web of Science Core Collection(WOS核心合集)作为数据源,对苍术研究论文进行筛选,采用CiteSpace 6.1.R6软件对发文量、作者、机构、关键词等绘制知...目的:分析中药苍术的研究现状、热点和趋势。方法:以中国知网、万方数据库、PubMed和Web of Science Core Collection(WOS核心合集)作为数据源,对苍术研究论文进行筛选,采用CiteSpace 6.1.R6软件对发文量、作者、机构、关键词等绘制知识图谱,进行可视化分析。结果:获得3 007篇中文文献和366篇英文文献,其中中文文献核心作者77位,英文文献核心作者87位。作者机构主要为中国、日本和韩国等国家的高校,中文发文量第一的机构为辽宁中医药大学,英文发文量第一的为中国中医科学院(China Acad Chinese Med Sci)。被引频次最高的文章发表在《中国中药杂志》,共计565次。“苍术”和“Atractylodes lancea”是高频关键词,研究热点主要集中于苍术的化学成分、药材栽培和药理作用等方面。前沿分析表明苍术的“焦苍术”和“免疫调节活性”是未来的研究趋势。结论:苍术研究热度处于上升趋势,但跨地区之间的作者和机构合作不足,研究方向趋同,需展开更多持续性的互动和交流,完善苍术质量标准和药理作用机制研究。展开更多
溶解性有机碳(Dissolved organic carbon,DOC)是农田土壤碳库中最重要的活性碳组分。DOC可为土壤微生物提供必需的营养元素,也会诱导复杂的环境效应。本研究以中国青岛市大沽河农业区为研究对象,利用室内培养实验,并结合傅里叶变换离子...溶解性有机碳(Dissolved organic carbon,DOC)是农田土壤碳库中最重要的活性碳组分。DOC可为土壤微生物提供必需的营养元素,也会诱导复杂的环境效应。本研究以中国青岛市大沽河农业区为研究对象,利用室内培养实验,并结合傅里叶变换离子回旋共振质谱(Fourier transform ion cyclotron resonance mass spectrometry,FT-ICR MS),从分子水平阐明不同氧化还原条件下土壤剖面中DOC转化的内在规律。研究发现:深层土壤的DOC来源以上层淋溶为主。土壤DOC的平均m/z、芳香指数(Aromatic index,AI)、O/C和双键当量(Double bond equivalent,DBE)随土壤深度的增加而减小。随着土壤深度的增加,反应过程中被降解的DOC分子DBE范围明显缩小(从0~18缩减至0~9),说明土壤对DOC的降解能力随着深度的增加有明显的下降。有氧培养后的DOC分子比无氧培养后的DOC分子具有更高的分子量、芳香性和不饱和度,且脂质的相对丰度比无氧组更低而木质素的相对丰度比无氧组更高,说明有氧条件可同步促进DOC分子的降解和生成。展开更多
Highly evolved granite is an important sign of the mature continent crust and closely associated with deposits of rare metals.In this work,the authors undertake systematically zircon U-Pb ages and whole rock elemental...Highly evolved granite is an important sign of the mature continent crust and closely associated with deposits of rare metals.In this work,the authors undertake systematically zircon U-Pb ages and whole rock elemental data for highly evolved granitic intrusions from the Great Xing’an Range(GXR),NE China,to elucidate their discriminant criteria,spatial-temporal distribution,differentiation and geodynamic mecha-nism.Geochemical data of these highly evolved granites suggest that high w(SiO_(2))(>70%)and differentiation index(DI>88)could be quantified indicators,while strong Eu depletion,high TE_(1,3),lowΣREE and low Zr/Hf,Nb/Ta,K/Rb could only be qualitative indicators.Zircon U-Pb ages suggest that the highly evolved gran-ites in the GXR were mainly formed in Late Mesozoic,which can be divided into two major stages:Late Ju-rassic-early Early Cretaceous(162-136 Ma,peak at 138 Ma),and late Early Cretaceous(136-106 Ma,peak at 126 Ma).The highly evolved granites are mainly distributed in the central-southern GXR,and display a weakly trend of getting younger from northwest to southeast,meanwhile indicating the metallogenic potential of rare metals within the central GXR.The spatial-temporal distribution,combined with regional geological data,indicates the highly evolved Mesozoic granites in the GXR were emplaced in an extensional environ-ment,of which the Late Jurassic-early Early Cretaceous extension was related to the closure of the Mongol-Okhotsk Ocean and roll-back of the Paleo-Pacific Plate,while the late Early Cretaceous extension was mainly related to the roll-back of the Paleo-Pacific Plate.展开更多
文摘目的:分析中药苍术的研究现状、热点和趋势。方法:以中国知网、万方数据库、PubMed和Web of Science Core Collection(WOS核心合集)作为数据源,对苍术研究论文进行筛选,采用CiteSpace 6.1.R6软件对发文量、作者、机构、关键词等绘制知识图谱,进行可视化分析。结果:获得3 007篇中文文献和366篇英文文献,其中中文文献核心作者77位,英文文献核心作者87位。作者机构主要为中国、日本和韩国等国家的高校,中文发文量第一的机构为辽宁中医药大学,英文发文量第一的为中国中医科学院(China Acad Chinese Med Sci)。被引频次最高的文章发表在《中国中药杂志》,共计565次。“苍术”和“Atractylodes lancea”是高频关键词,研究热点主要集中于苍术的化学成分、药材栽培和药理作用等方面。前沿分析表明苍术的“焦苍术”和“免疫调节活性”是未来的研究趋势。结论:苍术研究热度处于上升趋势,但跨地区之间的作者和机构合作不足,研究方向趋同,需展开更多持续性的互动和交流,完善苍术质量标准和药理作用机制研究。
文摘溶解性有机碳(Dissolved organic carbon,DOC)是农田土壤碳库中最重要的活性碳组分。DOC可为土壤微生物提供必需的营养元素,也会诱导复杂的环境效应。本研究以中国青岛市大沽河农业区为研究对象,利用室内培养实验,并结合傅里叶变换离子回旋共振质谱(Fourier transform ion cyclotron resonance mass spectrometry,FT-ICR MS),从分子水平阐明不同氧化还原条件下土壤剖面中DOC转化的内在规律。研究发现:深层土壤的DOC来源以上层淋溶为主。土壤DOC的平均m/z、芳香指数(Aromatic index,AI)、O/C和双键当量(Double bond equivalent,DBE)随土壤深度的增加而减小。随着土壤深度的增加,反应过程中被降解的DOC分子DBE范围明显缩小(从0~18缩减至0~9),说明土壤对DOC的降解能力随着深度的增加有明显的下降。有氧培养后的DOC分子比无氧培养后的DOC分子具有更高的分子量、芳香性和不饱和度,且脂质的相对丰度比无氧组更低而木质素的相对丰度比无氧组更高,说明有氧条件可同步促进DOC分子的降解和生成。
基金Supported by projects of the National Natural Science Foundation of China(Nos.92062216,41888101).
文摘Highly evolved granite is an important sign of the mature continent crust and closely associated with deposits of rare metals.In this work,the authors undertake systematically zircon U-Pb ages and whole rock elemental data for highly evolved granitic intrusions from the Great Xing’an Range(GXR),NE China,to elucidate their discriminant criteria,spatial-temporal distribution,differentiation and geodynamic mecha-nism.Geochemical data of these highly evolved granites suggest that high w(SiO_(2))(>70%)and differentiation index(DI>88)could be quantified indicators,while strong Eu depletion,high TE_(1,3),lowΣREE and low Zr/Hf,Nb/Ta,K/Rb could only be qualitative indicators.Zircon U-Pb ages suggest that the highly evolved gran-ites in the GXR were mainly formed in Late Mesozoic,which can be divided into two major stages:Late Ju-rassic-early Early Cretaceous(162-136 Ma,peak at 138 Ma),and late Early Cretaceous(136-106 Ma,peak at 126 Ma).The highly evolved granites are mainly distributed in the central-southern GXR,and display a weakly trend of getting younger from northwest to southeast,meanwhile indicating the metallogenic potential of rare metals within the central GXR.The spatial-temporal distribution,combined with regional geological data,indicates the highly evolved Mesozoic granites in the GXR were emplaced in an extensional environ-ment,of which the Late Jurassic-early Early Cretaceous extension was related to the closure of the Mongol-Okhotsk Ocean and roll-back of the Paleo-Pacific Plate,while the late Early Cretaceous extension was mainly related to the roll-back of the Paleo-Pacific Plate.
