检索结果-南通市图书馆

Revealing the effect of preparation parameters on zeolite adsorption performance for low and medium concentrations of ammonium

引用

Journal of Environmental Sciences 2019年第11期31卷 177-188页

作者： wenyan he Hui Gong Kuo Fang Fei Peng Kaijun Wang State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084China School of Water Resources & Environment China University of Geosciences Beijing 100083 China

The effect of preparation parameters on the performance of zeolite for ammonium (20-300 mg N/L) adsorption from simulated wastewater is *** was found that the ratios of Na2O/SiO2 and Si/Al had a more important influence than crystallization time on zeolite adsorption *** low Na2O/SiO2 ratios were beneficial for fabrication of zeolites with high proportions of micropore area and volume,which led to the surface adsorption mechanism being dominated by surface free energy and pore ***,with decreasing Si/Al ratios,the effect of ion-exchange was more prominent due to the high negative surface potential of *** addition,the concentration of weak acid sites on the zeolites was increased with lower ratios of Na2O/SiO2 and Si/Al,which may promote ammonium ***,the most effective zeolite for ammonium removal,which was fabricated at Na2O/SiO2 =1.375,Si/Al =4 and crystallization time of 48 hr,exhibited the cooperative effects of adsorption,ion-exchange and a large amount of weak acid *** maximum ammonium adsorption capacity (35.06 t 0.98 mg/g) and the removal efficiency (94.44%± 4.00%) were obtained at the dosage of 4.0 g/L zeolite NaX at ammonium concentrations of 300 mg N/L and 20 mg N/L,*** Freundlich isotherm and pseudo-first-order kinetics models provided excellent fitting for the ammonium adsorption *** addition,zeolite NaX showed about 1.23-3.2 times the ammonium adsorption capacity of *** stable and efficient reusability of zeolite NaX after five regeneration cycles demonstrated that this adsorbent has considerable potential for practical industrial applications.

关键词： Zeolite synthesis Ammonium nitrogen removal Ion exchange Performance optimization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geochronology and geochemistry of the Donglufang porphyry-skarn Mo-Cu deposit in the southern Yidun Terrane and their geological significances

引用

Geoscience Frontiers 2018年第5期9卷 1433-1450页

作者： wenyan he Shixiong Xie Xudong Liu Xue Gao Yanlu Xing State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences School of Earth Atmosphere and Environment Monash University

The newly-discovered Donglufang Moe Cu porphyry-skarn deposit is located in the southern Yidun Terrane, southeast Tibet, with more than 80 million tonnes(Mt) of reserves(grading 0.15 wt.% Mo and0.48 wt.% Cu) hosted in Triassic strata and Late Cretaceous granodiorite porphyry. Ree Os dating of molybdenum ore yielded a weighted mean age of 84.9 ± 1.0 Ma and an isochron age of 85.2 ± 0.6 ***-ICP-MS Ue Pb dating of zircons from the granodiorite porphyry yielded206 Pb/238 U ages ranging from 87.4 Ma to 84.2 Ma with a weighted mean206 Pb/238 U age of 85.1 ±0.5 Ma, indicating a temporal linkage between granitic magmatism and Moe Cu mineralization. Geochemical analyses show that the granodiorite porphyries are I-type granites with Si O_2 contents of 64.3 -66.7 wt.%. These rocks are typically metaluminous with high K_2 O/Na_2 O ratios, low Mg O(1.32 -1.56 wt.%), Cr(5.6 -12.9 ppm), Ni(3.79 -10.81 ppm), Mg#(43 -52) values, and high Sr(304 -844 ppm), Sr/Y(21.2 -50.8) and La/Yb ratios(37.0 -60.1). They are enriched in light rare-earth elements(LREE) relative to heavy rare-earth elements(HREE), with slightly negative Eu anomalies, and are enriched in Th, U and large ion lithophile elements(LILE, e.g., K and Rb), and depleted in high field strength elements(HFSE, e.g., Nb, Ta, P and Ti). They also show negative zircon εHf(t) values(-6.7 to -2.3) and negative whole rock εNd(t) values(à5.2 to-4.3), as well as old Hfe Nd model ages, indicating the magmas were derived from a thickened ancient lower crust within the garneteamphibolite facies. Considering the tectonic evolution of the Yidun Terrane, geochemical characteristics of granodiorite porphyry, and the ages of mineralization obtained in this study. We suggest that the Donglufang deposit was formed in a post-collisional setting, which has a genetic relationship with the emplacement of the granodiorite porphyry. The present study provide key information for the exploration of the Late Cretaceous metallogeny in the Yidun Terrane.

关键词： Late cretaceous Mo-Cu metallogenesis Molybdenite Re-Os geochronology U-Pb zircon dating Yidun terrane

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cellular and molecular imaging for stem cell tracking in neurological diseases

引用

Stroke & Vascular Neurology 2021年第1期6卷 121-127页

作者： Xiaoxia Yang De-Cai Tian wenyan he Wei Lv Junwan Fan Haowen Li Wei-Na Jin Xia Meng China National Clinical Research Center for Neurological Diseases Capital Medical UniversityBeijing Tiantan HospitalBeijingChina Department of Neurology Tianjin Neurological InstituteTianjin Medical University General HospitalTianjinChina

Stem cells(SCs)are cells with strong proliferation ability,multilineage differentiation potential and self-renewal *** transplantation represents an important therapeutic advancement for the treatment strategy of neurological diseases,both in the preclinical experimental and clinical *** and breakthrough SC labelling and tracking technologies are widely used to monitor the distribution and viability of transplanted cells non-invasively and *** we summarised the research progress of the main tracers,labelling methods and imaging technologies involved in current SC tracking technologies for various neurological ***,the applications,challenges and unresolved problems of current SC tracing technologies were discussed.

关键词： neurological diseases clinical

来源：

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

Pertussis toxin–induced inflammatory response exacerbates intracerebral haemorrhage and ischaemic stroke in mice

引用

Stroke & Vascular Neurology 2022年第1期7卷 29-37页

作者： Ming Zou Yan Feng Yuwhen Xiu Yan Li Ying Zhang Junwan Fan Haowen Li Jingli Cao wenyan he Wei-Na Jin Tianjin Neurological Institute Tianjin Medical University General HospitalTianjinChina China National Clinical Research Center for Neurological Diseases/Advanced Innovation Center for Human Brain Protection Beijing Tiantan HospitalBeijingChina

Background Stroke is a devastating disease,including intracerebral haemorrhage(ICH)and ischaemic *** evidences indicate that systemic inflammatory cascades after stroke contribute to brain ***,the direct effects and features of systemic inflammation on brain injury,especially comparing between ischaemic and haemorrhagic stroke,are still *** Pertussis toxin(PT)was used to build a pro-inflammatory milieu after ICH and ischaemic stroke in mouse *** neurodeficits,stroke lesion,immune response and blood–brain barrier(BBB)destruction were *** In ICH mouse model,PT-induced systemic inflammation exacerbated neurological deficits,and enlarged haemorrhage lesion and perihaematomal *** also found promoted leucocyte infiltration and inflammatory cytokine release into the brain after PT ***,the integrity of the BBB was further disrupted after receiving ***,we demonstrated that PT enhanced brain inflammation and aggravated stroke severity in middle cerebral artery occlusion mouse *** Our results suggest that PT increases inflammatory response that exacerbates brain injury after ICH or ischaemic stroke in mouse model.

关键词： inflammatory inflammation intracerebral

来源：

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

滇西金宝山铂钯矿床S-Os同位素特征及其对成矿过程的制约

引用

岩石学报 2018年第5期34卷 1258-1270页

作者：卢宜冠和文言中国地质大学地质过程与矿产资源国家重点实验室北京100083

金宝山铂钯矿床位于扬子板块西缘,毗邻哀牢山造山带北段,是三江成矿带唯一的大型岩浆型铂族元素矿床。以往的研究中,金宝山岩体是否经历地壳混染存在较大争议,制约了对硫饱和机制和矿床成因的认识。前人对矿石中硫化物的S同位素的研究... 详细信息

金宝山铂钯矿床位于扬子板块西缘,毗邻哀牢山造山带北段,是三江成矿带唯一的大型岩浆型铂族元素矿床。以往的研究中,金宝山岩体是否经历地壳混染存在较大争议,制约了对硫饱和机制和矿床成因的认识。前人对矿石中硫化物的S同位素的研究发现绝大部分δ^(34)S值位于1‰~2‰,表现为幔源特征,显示少量或无明显地壳混染作用。本文对含非常规硫化物组合(紫硫镍矿-黄铁矿-黄铜矿)的矿石展开了同位素研究,结合最新研究数据,利用质量平衡原理定量建立了R值(硅酸盐岩浆/硫化物)、百分百硫化物PGE含量和δ^(34)S之间的关系。富PGE矿石具有较高的R值(2000~10000)和PGE含量(如Ir百分百硫化物:2429×10^(-9)~10738×10^(-9)),并具有地幔特征的δ^(34)S范围(1‰~2‰),而贫PGE(如Ir百分百硫化物:449×10^(-9)~2017×10^(-9))的矿石R值较低(500~2000),表现出显著的地壳S同位素的特征(4.4‰~6.7‰)。此外,Re-Os同位素研究表明金宝山铂钯矿床相比一些富硫化物铜镍矿床(如力马河和杨柳坪)具有较低的γOs(21.9~60.5)和较高R值,是大量岩浆与硫化物反应导致的结果,表明其矿石γOs的高低并不能直接反应岩体的地壳混染程度。因此我们在利用S-Os同位素在研究岩浆型铜镍铂族元素矿床时需特别注意,虽然δ^(34)S和γOs的大小通常作为研究地壳混染作用的指示剂,但它们却往往受到矿床类型(铂钯矿床、铜镍矿床)以及矿石类型(富PGE矿石、贫PGE矿石)的影响。特别是对于高R值的铂族元素矿床,矿石呈现出接近幔源特征的δ^(34)S和γOs同位素值并不能排除其在形成的过程中没有地壳物质的加入,而应综合SrNd同位素以及微量元素地球化学特征综合判断是否发生了明显的地壳混染作用。

关键词：铂钯矿床地壳混染 R值 S-Os同位素金宝山

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

滇西金宝山富铂钯岩体岩浆源区研究:铂族元素和Sr-Nd同位素约束

引用

地学前缘 2018年第6期25卷 196-208页

作者：卢宜冠和文言中国地质调查局天津地质调查中心天津300170 中国地质大学地质过程与矿产资源国家重点实验室北京100083

金宝山杂岩体位于扬子板块西缘,毗邻哀牢山造山带北段,岩体中蕴含丰富的铂钯资源,是峨眉山大火成岩省(ELIP)中大型岩浆型铂族元素矿床。岩体的主要组成为辉石橄榄岩,矿体以似层状、透镜状产出于辉石橄榄岩中。地幔是镍矿床和铂族元素矿... 详细信息

金宝山杂岩体位于扬子板块西缘,毗邻哀牢山造山带北段,岩体中蕴含丰富的铂钯资源,是峨眉山大火成岩省(ELIP)中大型岩浆型铂族元素矿床。岩体的主要组成为辉石橄榄岩,矿体以似层状、透镜状产出于辉石橄榄岩中。地幔是镍矿床和铂族元素矿床最重要的源区,因而对Ni、Cu及PGE等元素行为的研究,是剖析岩浆型Ni-Cu-PGE矿床源区特征的一个重要研究方向。该研究获得金宝山岩体中辉橄岩铂族元素及Sr-Nd同位素数据,结合前人对ELIP中不同类型岩石系列PGE成分研究及Ni、Cu、PGE等元素在岩浆和硫化物中的分配系数,半定量模拟得到金宝山原始岩浆的形成源于地幔中高度部分熔融(25%-40%)形成的富PGE岩浆(含12.8×10^-9 Pd,9.8×10^-9 Pt,0.6×10^-9 Rh和0.7×10^-9 Ir),其铂族元素成分与ELIP苦橄岩成分相当,并且岩浆在演化的过程中遭受了10%-20%地壳混染作用。利用批式部分熔融公式及各铂族元素在硅酸盐矿物和熔体之间的分配系数反演计算得到产生金宝山熔体的地幔约含有5.3×10^-9 Pd,7.5×10^-9 Pt,0.75×10^-9 Rh和1.5×10^-9 Ir,相比原始地幔而言并没有表现出明显富集PGE的特征。这表明地幔中高度部分熔融+大量岩浆与硫化物的充分反应是形成大型岩浆型铂族元素矿床的一种可具备的条件。

关键词：岩浆源区铂族元素部分熔融金宝山

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison of the Concentrations of Lidocaine in Different Body Fluids/Tissues after Subarachnoid Space and Intravenous Administration of a Lethal Dose of Lidocaine

引用

Journal of Forensic Science and Medicine 2015年第1期1卷 48-53页

作者： Nan Zhang JunHong Sun Zhiwen Wei wenyan he Guohua Jin Xiaohong Zhang Pengxiang Gao Longmei Wang Keming Yun School of Forensic Medicine Shanxi Medical UniversityTaiyuanChina

The objective of the study was to compare the concentration of lidocaine in different body fluids/tissues after subarachnoid space and intravenous administrations of a lethal dose of *** 18 dogs were used in the *** dogs were given subarachnoid anesthesia,another were given an intravenous injection of a dose of 75 mg/kg weight of lidocaine hydrochloride in 5 min and the last 6 dogs were used as the blank control dogs and given a subarachnoid space injection or a femoral artery injection of the same volume of sodium *** soon as its vital signs disappeared,each dog was dissected and the specimen,such as brain,cerebrospinal fluid(CSF)in lateral ventricle,CSF in subarachnoid space,spinal cord(cervical spinal cord,thoracic spinal cord,lumbar spinal cord,and waist spinal cord),heart,lung,liver,spleen,kidney,bile,urine,heart blood,peripheral blood,muscle in injection location,and muscle in no injection location,were collected for analysis of lidocaine *** was performed with gas chromatography‑mass spectrometry(GC‑MS).From the maximum to the minimum,the order of lidocaine concentration detected in the subarachnoid space‑administered dogs was as follows:CSF in subarachnoid space,waist spinal cord,thoracic spinal cord,CSF in lateral ventricle,lumbar spinal cord,cervical spinal cord,lung,kidney,muscle in injection location,heart,brain,spleen,heart blood,liver,peripheral blood,bile,muscle in no injection location,and *** order of lidocaine concentration detected in the intravenously administered dogs was as followed:Kidney,heart,lung,spleen,brain,liver,peripheral blood,bile,heart blood,cervical spinal cord,thoracic spinal cord,muscle in injection location,lumbar spinal cord,muscle in no injection location,CSF in subarachnoid space,urine,and CSF in lateral *** maximum concentration of lidocaine was detected in the subarachnoid space CSF of subarachnoid space‑administered dead dogs,while in intravenously injected d

关键词： Anesthesia accident distribution of lidocaine forensic medicine forensic toxicological analysis intravenous administration intravenous injection lidocaine postmortem distribution subarachnoid administration subarachnoid anesthesia

来源：

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

progenitors via suppression of ERK activation

progenitors via suppression of ERK activation

引用

第三届“模式生物与人类健康”发育遗传学全国学术研讨会

作者：兰雨 wenyan he Bing Liu Xiao Yang Genetic Laboratory of Development and Diseases Institute of Biotechnology Affiliated Hospital of Academy of Military Medical Sciences

In mouse mid-gestational embryos,definitive hematopoietic stem progenitor cells are derived directly from a very small proportion of the arterial ***,the physiological mechanisms restraining excessive endothelial-hematopoietic transition remain *** show here that genetic deletion of Smad4 from the endothelium stage(using Tie2-Cre),but not from embryonic hematopoietic cells(using Vav-Cre),leads to a strikingly augmented emergence of intra-arterial

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Generation of hematopoietic Stem Cells from Purified Embryonic Endothelial Cells by a Simple and Efficient Strategy

引用

Journal of Genetics and Genomics 2013年第11期40卷 557-563页

作者： Zhuan Li Fan Zhou Dongbo Chen wenyan he Yanli Ni Lingfei Luo Bing Liu Key Laboratory of Freshwater Fish Reproduction and Development Ministry of EducationLaboratory of Molecular Developmental BiologySchool of Life ScienceSouthwest University 307-Ivy Translational Medicine Center Laboratory of OncologyAffiliated Hospital of Academy of Military Medical Sciences

Recent progress by versatile approaches supports the new hypothesis that multi-potent hematopoietic stein cells （HSCs） are directly formed from a rare population of endothelial cells in mid-gestation mouse embryos. This process is therefore known as the endothelial-to- hematopoietic transition （EHT）. Nevertheless, there is no functional evidence that documents the HSC transition from purified endothelial cells. In this study, we developed an OP9-DLl-based co-culture system that was able to facilitate the HSC specification and/or expansion in vitro of mouse embryonic day 10.5 （El0.5） Tie2~ cells remarkably. Then, the immunophenotypically defined endothelial ceils were harvested by a combination of surface markers （Flkl＋CD31 ~CD41 CD45 Ter119 ） from the caudal half of EI0.0-EI 1.0 mouse embryos. The transplantation of the endothelia/OP9-DL1 co-cultures led to long-term, high-level, multi-lineage, and multi-organ he- matopoietic reconstitution in the irradiated adult recipients. The induced HSC activity was initially observed at El0.5, and a significant increase was detected at El 1.0, which suggests a temporally specific regulation. Taken together, tbr the first time, we provide functional evidence showing the HSC potential of purified embryonic endothelial cells, which is indispensable for the emerging EHT concept. Moreover, the newly defined co-culture system will aid the exploration of the key molecules governing the HSC transition from embryonic and even postnatal endothelial cells, which has enormous significance in basic and translational research.

关键词： hematopoietic stem cells Endothelial-to-hematopoietic transition Endothelial cells Aorta-gonad--mesonephros region

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

滇西北衙金矿床富水岩浆对成矿的制约

引用

岩石学报 2017年第7期33卷 2175-2188页

作者：鲍新尚和文言高雪中国地质大学地质过程与矿产资源国家重点实验室北京100083

成矿岩浆富水(>4%)是形成斑岩型矿床的关键。滇西北衙金矿床是金沙江-哀牢山新生代富碱斑岩成矿带中规模最大的金多金属矿床,目前探明金资源储量超过320吨,伴生的铅锌、银、铜、铁、硫也达到大-中型规模。本文以北衙成矿的二长花岗斑岩... 详细信息

成矿岩浆富水(>4%)是形成斑岩型矿床的关键。滇西北衙金矿床是金沙江-哀牢山新生代富碱斑岩成矿带中规模最大的金多金属矿床,目前探明金资源储量超过320吨,伴生的铅锌、银、铜、铁、硫也达到大-中型规模。本文以北衙成矿的二长花岗斑岩中角闪石斑晶和锆石为研究对象,开展岩相学和地球化学研究,厘定成矿岩浆的特征,并探讨富水岩浆对成矿的制约。研究表明,北衙二长花岗斑岩角闪石斑晶发育、轻稀土富集而重稀土亏损、具有高Sr(>300×10^(-6))、低Y(<10×10^(-6))和高(La/Yb)N(6.19~26.8)的地球化学特征,暗示在岩浆结晶早期有角闪石斑晶的晶出。角闪石晶出的条件是岩浆中水含量大于4.5%,因此北衙金矿床成矿岩浆演化早期角闪石的晶出显示成矿岩浆相对富水。角闪石矿物组分计算表明岩浆熔体中水含量在3.8%~4.1%之间,进一步证实北衙金矿床成矿岩浆相对富水。北衙金矿床这种具有高水含量的岩浆在源区岩石部分熔融的过程中,水的加入可以降低其熔点,促进源区含Cu、Au硫化物重熔,或萃取岩石中Cu、Au成矿元素,或聚集岩浆中分散分布的金属元素,形成富金属、富水的岩浆。含矿岩浆就位后,其通过压力的降低(岩浆房脆性破裂或岩浆向上侵位)来降低水的溶解度,或通过岩浆持续的结晶(在等压条件下晶出无水矿物)逐渐提高岩浆水含量,促使熔体中水含量大于水在熔体中溶解度,从而导致岩浆水达到饱和状态,流体开始出溶。总体而言,北衙金矿床富水岩浆不仅能促进北衙矿床成矿流体的形成与演化,也对成矿流体中Cu、Au等成矿元素的富集具有重要的作用。

关键词：富水岩浆成矿制约岩相学地球化学北衙金矿床滇西

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：