检索结果-南通市图书馆

Study on Strontium Mineralization by Thiobacilus Denitrificans for Remediation

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2017年第S1期91卷 291-292页

作者： WU Qinqin dai qunwei Han Linbao Southwest University of Science and Technology Mianyang 621000

1 Introduction Radioactive pollution is increasingly serious and radioactive pollution can not be repaired immediately once it breaks *** contamination is a research hot point as one of the typical radioactive polluti... 详细信息

关键词： Study on Strontium Mineralization by Thiobacilus Denitrificans for Remediation

The Lowest Boundary Age of Travertine in Dawanzhangjia Ravine, Huanglong, China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2018年第2期92卷 879-880页

作者： WANG Fudong DONG Faqin ZHAO Xueqin ZHANG Haiwei SUN Shiyong dai qunwei LI Qiongfang LI Gang MA Pengcheng Department of Geological Engineering School of Environment and Resource Southwest University of Science and Technology Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education Institute of Global Environmental Change Xi'an Jiaotong University

Objective One of major challenges in paleoenvironmental reconstruction using travertine in the Huanglong area is whether one can accurately determinate the age of travertine through high-precision and high-resolution dating techniques. Previous works of 14C or ESR chronology, however, have shown that the variation of deposition ages of travertine was displayed inconsistent with each other even conflict. For instance, （1） The oldest travertine age （80 ka） located in the middle of this travertine succession is departure from sequential deposition; （2） Top or boundary ages in this sedimentary section, even with the same dating method （14C）, are three times errors, moreover, the age of the depositional sequence is not continuous. We report here the U230Th ages in lowest boundary of travertine in Dawanzhangjia Valley, Huanglong, China, to discuss the effectiveness of U-series dating for cold-water travertine and the significance of age for vicissitude of paleoenvironment.

关键词： The Lowest Boundary Age of Travertine in Dawanzhangjia Ravine China Huanglong

The analysis of microscopy imaging on liquid crystalline components of the cell nucleus

在线全文

学校读者我要写书评

暂无评论

Journal of Biomedical Science and Engineering 2012年第6期5卷 307-314页

作者： Shiyong Sun Mingxue Liu qunwei dai Faqin Dong Lizhu Liu Tingting Huo Key Laboratory of Waste Solid Treatment and Resource Recycle of Ministry of Education Southwest University of Science and Technology Mianyang China

Dinoflagellates nuclei allow for liquid crystalline characterization without core histones. In this study, nuclei were isolated from the athecate Karenia dinoflagellate species with minimum destruction to their native structure during preparation procedures. The liquid crystalline nuclei were studied by microscopy techniques of Metripol birefringence microscopy, Confocal Laser Scanning Microscopy (CLSM) and synchrotron radiation-based hard X-ray Microscopy with computed tomography, respectively. The 3D reconstruction techniques of hard X-ray tomography and CLSM were also discussed. The important biophysical parameters of the interspaces between chromosomes, nuclear surface areas and chromosome-occupied volumes were calculated from a 3D rendering of a reconstructed nucleus. The results of calculated average chromosomal DNA concentration of dinoflagellate was consistent with the concentration which can spontaneously assemble into the cholesteric liquid crystal phase in vitro.

关键词： Liquid Crystal Cellular Nucleus Microscopy 3D Reconstruction Genomic Condensation

Reciprocity Effect between Silicate Bacteria and Wollastonite

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

矿物学报 2013年第S1期33卷 16-16页

作者： dai qunwei DONG Fa-qin ZHAO Yulian DENG Jianjun Southwest University of Science and Technology The Forth People's Hospital

This paper studied the reciprocity effect between wollastonite and a strain silicate bacterium from purple soil. We analyzed the changes of pH value, glucose (GLU) residual concentration, electrolyte and Mn, Si, Fe etc. in the culture liquid with wollastonite after 48 h. The results show that the GLU wastage of silicate bacteria with wollastonite is 2.5 times of the bacterial contrast. It showed wollastonite could obviously accelerate silicate bacteria growth, but bacterial cell broken and distorted badly have been found by SEM analysis. The solubilization of silicate bacteria to Si element of wollastonite reached above 10 times. At the same time, three apices in FTIR of wollastonite (898 cm-1, 925 cm-1, 962 cm-1) descended obviously after the action of silicate bacteria, which shows that a great deal of Si has dissolved out. So we can get that wollastonite has remarkable effect to the growth of silicate bacteria and silicate bacteria has obvious solubilization to Si of wollastonite.

关键词： reciprocity wollastonite silicate bacteria solubilization autolysis

Composition Characteristic and Surface Charge Simulation of Atmospheric Dust Fall in Tianshui City

在线全文

学校读者我要写书评

暂无评论

矿物学报 2013年第S1期33卷 13-13页

作者： CHEN Wu DONG Faqin dai qunwei YANG Jie NIU Zhen School of Materials Science and Engineering Southwest University of Science and Technology Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of EducationSouthwest University of Science and Technology

In order to know the particle size distribution and mineral compositions of dust in Maiji town, Tianshui City, Gansu Province, size distribution and physical compositions of atmosphere natural dropping dust have been analyzed. Based on the natural dropping dust ζ potential and the mass percentage of main mineral compositions in dust fall, we present two models (calculation method and hybrid method) for the zeta potential of atmospheric dust fall in pure water. The results illustrated that the natural dropping dust in Maiji town belongs to inhalable particles. The main mineral compositions and contents of the dust are quartz (57.08%), calcite (27.79%), albite (10.29%), muscovite (4.84%). Atmospheric dust fall in pure water is electronegativity and ζ potential decreased with increasing pH. There are some differences exist in the two modeling ways, but have a similar tendency. The zeta potential differences between natural dropping dust and modeling dust reflects the zeta potential contribution rate of main mineral particles in dust and the effect of trace polarity organic pollutants or other minerals.

关键词： Atmospheric dust particle size Maiji town, mineral compositions Tianshui City

Dissolution Characteristic Study on Dustfall in Citric

在线全文

学校读者我要写书评

暂无评论

矿物学报 2013年第S1期33卷 92-92页

作者： TANG Jun DONG Faqin dai qunwei DENG Yuequan ZHOU Shiping CHEN Wu Key Laboratory of Solid Waste Treatment and the Resource Recycle Ministry of EducationSouthwest University of Science and Technology School of Environment and Resource Southwest University of Science and Technology

In this paper, the dissolution characteristics of Xining dustfall in citric acid solution was studied to evaluate the physical chemical change in acid conditions. pH along with conductivity was tested with time. FTIR, SEM and ICP analysis were applied to analyze the residuum and filtrate after 2 days’ dissolution experiment. It was shown in the pH/conductivity variation, solution’s pH rise sharply in the front 4 hours, then decrease slowly. After 4 hours, both the pH and conductivity become stable. Based on combined analysis of XRD and FTIR spectrum of dustfall before and after dissolution, that calcite and dolomite in dustfall are dissolved completely in the 0.05M citric acid solution in two days. Besides, amount of metal cations were extracted from the dustfall during the dissolution, including Ca2+,K+,Mg2+,Fe3+,Al3+,Si. In general, after the dissolution of dustall in citric acid, some minerals are dissolved and amount of metal elements are extracted. Carbonate minerals almost dissolved completely, also the structure of silicate minerals changed as the extraction of elements.

关键词： Dustall Citric acid Dissolution Characteristic analysis

在线全文

学校读者我要写书评

暂无评论

工业固体废物资源循环利用矿物学

地学前缘 2014年第5期21卷 302-312页

作者：董发勤徐龙华彭同江代群威谌书西南科技大学固体废物处理与资源化教育部重点实验室四川绵阳621010

固体废物是一种潜在的"混合复杂资源",实现固体废物资源循环利用是构筑可持续资源供给与应用的重要方式,也是循环经济的重要内容。阐述了固体废物资源循环利用的属性特点、意义和5R原则,同时总结了固体废物资源循环利用研究的主要内容... 详细信息

固体废物是一种潜在的"混合复杂资源",实现固体废物资源循环利用是构筑可持续资源供给与应用的重要方式,也是循环经济的重要内容。阐述了固体废物资源循环利用的属性特点、意义和5R原则,同时总结了固体废物资源循环利用研究的主要内容和学科基础,归纳了固体废物资源循环利用面临的主要科学技术问题。以蛇纹石尾矿、煤矸石、粉煤灰、冶炼渣、工业副产石膏、电子废物等典型固废资源循环利用为例,介绍了不同种类固废的矿物学特性、循环利用发展方向,并阐述了固体废物资源循环利用的矿物学方法,指出了未来工业固体废物资源循环利用的研究重点。

关键词：工业固体废物混合资源复杂资源循环利用矿物学 5R原则

在线全文

学校读者我要写书评

暂无评论

啤酒酵母菌对溶液中锶离子的吸附行为

环境污染与防治 2009年第8期31卷 11-15页

作者：张伟董发勤代群威西南科技大学固体废物处理与资源化省部共建教育部重点实验室四川绵阳621010 西南科技大学分析测试中心四川绵阳621010 西南科技大学环境与资源学院四川绵阳621010

利用废弃啤酒酵母菌为生物吸附剂,考察了pH、啤酒酵母菌加入量、锶离子初始浓度、吸附时间等对锶离子吸附行为的影响,并通过红外光谱分析探讨了吸附机制。结果表明:(1)在吸附温度为25℃、pH为4.5、啤酒酵母菌加入量为2.0g/L、锶离子初... 详细信息

利用废弃啤酒酵母菌为生物吸附剂,考察了pH、啤酒酵母菌加入量、锶离子初始浓度、吸附时间等对锶离子吸附行为的影响,并通过红外光谱分析探讨了吸附机制。结果表明:(1)在吸附温度为25℃、pH为4.5、啤酒酵母菌加入量为2.0g/L、锶离子初始质量浓度为10.0mg/L、吸附60min的条件下,啤酒酵母菌对锶离子的吸附基本达到平衡。(2)啤酒酵母菌对锶离子的吸附较好地符合Langmuir和Freundlich吸附等温式,且以Langmuir吸附等温式拟合效果更优。在吸附温度为25℃、pH为4.5、啤酒酵母菌加入量为2.0g/L、吸附时间为180min、锶离子初始质量浓度为5.0～250.0mg/L的条件下,啤酒酵母菌对锶离子的理论饱和吸附量为29.67mg/g。(3)啤酒酵母菌吸附锶离子前后的红外图谱显示,部分吸收峰发生了位移并且透过率改变。推断在啤酒酵母菌吸附锶离子的过程中,锶离子先与—NH2和酰胺基团中的N原子进行配位络合,随后被络合了的锶作为成核位点再吸附更多的锶离子在表面。此外,蛋白质特征谱带——酰胺Ⅰ带和酰胺Ⅱ带吸收峰的透过率也发生变化,可能是啤酒酵母菌蛋白质上的官能团也结合了锶离子。

关键词：啤酒酵母菌生物吸附放射性核素锶离子等温吸附

大气自然降尘与单株人体正常菌的体外相互作用研究

在线全文

学校读者我要写书评

暂无评论

环境科学学报 2007年第4期27卷 699-703页

作者：代群威董发勤邓建军西南科技大学环境与资源学院绵阳621010 绵阳市第四人民医院绵阳621000

对5种大气自然降尘主要化学成分进行分析,并对其与表皮葡萄球菌相互作用后各培养液中pH值、葡萄糖(GLU)、电解质以及Mn2+、Zn2+、Fe3+、Ni3+等浓度的变化进行测定,以比较粉尘的化学成分及物理性状对试验目标菌生长的影响.同时通过SEM分... 详细信息

对5种大气自然降尘主要化学成分进行分析,并对其与表皮葡萄球菌相互作用后各培养液中pH值、葡萄糖(GLU)、电解质以及Mn2+、Zn2+、Fe3+、Ni3+等浓度的变化进行测定,以比较粉尘的化学成分及物理性状对试验目标菌生长的影响.同时通过SEM分析对粉尘与细菌作用过程中细菌形态和界面作用的情况进行了研究.结果表明,各种大气尘粒所含化学成分不同,与细菌作用后离子溶出量也不完全相同;Ca2+或Mg2+含量高的大气尘粒能使表皮葡萄球菌数量增大并增加其对GLU的利用;粉尘颗粒越小,越易与菌体结合;另外,粉尘颗粒形状的不规则性也大大增加了其与菌体间的膜界结合程度.

关键词：表皮葡萄球菌正常菌大气自然降尘电解质菌落数