Polyelectrolyte becomes more and more popular in electrocatalysis.The understanding of electrode/polyelectrolyte interfaces at the molecular level is important for guiding further the polyelectrolyte-based electrocata...Polyelectrolyte becomes more and more popular in electrocatalysis.The understanding of electrode/polyelectrolyte interfaces at the molecular level is important for guiding further the polyelectrolyte-based electrocatalysis.Herein,we demonstrate an in-situ surface-enhanced Raman spectroscopic method by using a three-electrode spectroelectrochemical cell towards characterizing the electrode/polyelectrolyte interfaces.The Ag/AgCl and Ag/Ag_(2)O electrodes are used as the reference electrode in the acidic and the alkaline systems,respectively.The working electrode is made of a transparent carbon thin film which loads the electrocatalysts.The applications of this method are demonstrated through the in-situ characterizations of the p-methylthiophenol adsorbed on the Au and Pt and the electrochemical oxidation of Au on polyelectrolyte membranes.The potential-dependent spectral features of these two systems show that this method is a powerful tool for investigating the electrode/polyelectrolyte interfaces in electrocatalysis.展开更多
By the end of 2020,83 silver deposits(or ore occurrences),including four super-large-scale deposits,nine large-scale deposits,33 medium-scale deposits and 37 small-scale deposits or ore occurrences,have been proved.Th...By the end of 2020,83 silver deposits(or ore occurrences),including four super-large-scale deposits,nine large-scale deposits,33 medium-scale deposits and 37 small-scale deposits or ore occurrences,have been proved.The amount of silver metal exceeds 86000 t with average grade of 100 g/t,which makes Daxing’anling region one of the the most important silver ore belt in China.However,the metallogenic characteristics and metallogenesis need to be clarified.The silver deposits in the study area are classified into three main types,which are magmatic hydrothermal vein type,continental volcano-subvolcanic type and skarn type,respectively.The supergiant deposits include the Shuangjianzishan deposit(silver metal amount of 15214 t with average grade of 138 g/t),the Baiyinchagandongshan deposit(silver metal amount of 9446 t with average grade of 187 g/t),the Huaobaote deposit(silver metal amount of 6852 t with average grade of 170 g/t),and the Fuxingtun deposit(silver metal amount of 5240 t with average grade of 196 g/t).The silver deposits are mainly distributed in the central and south of the Daxing’anling area,and mainly formed in the Yanshanian period.The silver polymetallic deposits in the Daxinganling area are significantly controlled by regional faults and the junction zone of volcanic rock basins and their margins.The north-east trending deep faults are the most important ore-controlling structures in this area.The distribution of silver polymetallic deposits along the main faults is obvious,and the intersection area of multiple groups of faults often form important mine catchments.The Permian is the most important ore-bearing formation in this area,but some important silver polymetallic deposits occur in Mesozoic volcanic basins or pre-Mesozoic strata.The magmatic rocks related to mineralization are mainly intermediate acidic or acidic intrusions,intermediate acidic lavas,pyroclastic rocks,and small intrusions of ultra-shallow or shallow facies of the Yanshanian Period.The mineralization element combination is mainly determined by the elemental geochemical background of surrounding rocks or source layers.In addition,the type of deposit,the distance from the mineralization center,and the degree of differentiation of ore-forming rock mass are also important influence factors.The article analyzes the prospecting prospects of each silver deposit type in the study area,discusses the relationship between mineralization center and deep prospecting,and proposes that porphyry silver deposits should be paid attention to.In the prospecting and exploration of silver deposits,comprehensive evaluation and multi-target prospecting need to be strengthened because silver can coexist or be associated with a variety of metals.展开更多
Objective To determine the spatio-temporal expression of p70S6k activation in hippocampus in mesial temporal lobe epilepsy. Methods Temporal lobe epilepsy model was established by stereotaxically unilateral and intrah...Objective To determine the spatio-temporal expression of p70S6k activation in hippocampus in mesial temporal lobe epilepsy. Methods Temporal lobe epilepsy model was established by stereotaxically unilateral and intrahip-pocampal injection of kainite acid (KA) in adult male C57BL/6 mice. Latent and chronic epileptogenesis were represented by mice 5 days after KA injection (n=5) and mice 5 weeks after KA injection (n=8), respectively. Control mice (n=5) were injected with saline. Immunohistochemical assays were performed on brain sections of the mice. Results Hippocampus both ipsilateral and contralateral to the KA injection displayed significantly up-regulated pS6 immunoreactivity in dispersed granule cells in 5-day and 5-week model mice. Conclusion The activation of p70S6k is mainly located in the dentate gyrus in KA-induced mouse model of temporal lobe epilepsy, indicating that the activation may be related with the disperse degree and hypertrophy of granule cells.展开更多
Background:Advanced technology has become a valuable tool in etiological studies of intellectual disability/global developmental delay(ID/GDD).The present study investigated the role of genetic analysis to confirm the...Background:Advanced technology has become a valuable tool in etiological studies of intellectual disability/global developmental delay(ID/GDD).The present study investigated the role of genetic analysis to confirm the etiology in ID/GDD patients where the cause of the disease was uncertain in central China.Methods:We evaluated 1051 ID/GDD children aged 6 months to 18 years from March 2009 to April 2017.Data concerning basic clinical manifestations were collected,and the method of etiology confirmation was recorded.Genome-wide copy number variations(CNVs)detection and high-throughput sequencing of exons in the targeted regions was performed to identify genetically-based etiologies.We compared the incidence of different methods used to confirm ID/GDD etiology among groups with differing degrees of ID/GDD using the Chi-square or Fisher exact probability test.Results:We recruited 1051 children with mild(367,34.9%),moderate(301,28.6%),severe(310,29.5%),and profoundly severe(73,6.9%)ID/GDD.The main causes of ID/GDD in the children assessed were perinatal factors,such as acquired brain injury,as well as single gene imbalance and chromosomal gene mutation.We identified karyotype and/or CNVs variation in 46/96(47.9%)of cases in severe ID/GDD patients,which was significantly higher than those with mild and moderate ID/GDD of 34/96(35.4%)and 15/96(15.6%),respectively.A total of 331/536(61.8%)patients with clear etiology have undergone genetic analysis while 262/515(50.9%)patients with unclear etiology have undergone genetic analysis(x^2=12.645,P<0.001).Gene structure variation via karyotype analysis and CNV detection increased the proportion of children with confirmed etiology from 51.0%to 56.3%,and second-generation high-throughput sequencing dramatically increased this to 78.9%.Ten novel mutations were detected,recessive mutations in X-linked genes(ATPase copper transporting alpha and bromodomain and WD repeat domain containing 3)and dominant de novo heterozygous mutations in X-linked genes(cyclin-dependent kinase like 5,protocadherin 19,IQ motif and Sec7 domain 2,and methyl-CpG binding protein 2)were reported in the study.Conclusions:The present study indicates that genetic analysis is an effective method to increase the proportion of confirmed etiology in ID/GDD children and is highly recommended,especially in ID/GDD children with uncertain etiology.展开更多
文摘Polyelectrolyte becomes more and more popular in electrocatalysis.The understanding of electrode/polyelectrolyte interfaces at the molecular level is important for guiding further the polyelectrolyte-based electrocatalysis.Herein,we demonstrate an in-situ surface-enhanced Raman spectroscopic method by using a three-electrode spectroelectrochemical cell towards characterizing the electrode/polyelectrolyte interfaces.The Ag/AgCl and Ag/Ag_(2)O electrodes are used as the reference electrode in the acidic and the alkaline systems,respectively.The working electrode is made of a transparent carbon thin film which loads the electrocatalysts.The applications of this method are demonstrated through the in-situ characterizations of the p-methylthiophenol adsorbed on the Au and Pt and the electrochemical oxidation of Au on polyelectrolyte membranes.The potential-dependent spectral features of these two systems show that this method is a powerful tool for investigating the electrode/polyelectrolyte interfaces in electrocatalysis.
基金financially supported by the projects of China Geological Survey(DD20221695,DD20160346 and DD20190379)the Fundamental Research Funds of the Central Public Welfare Scientific Research Institutes(JYYWF20183701 and JYYWF20183704)the Inner Mongolia Geological Exploration Fund Project(2020-YS03).
文摘By the end of 2020,83 silver deposits(or ore occurrences),including four super-large-scale deposits,nine large-scale deposits,33 medium-scale deposits and 37 small-scale deposits or ore occurrences,have been proved.The amount of silver metal exceeds 86000 t with average grade of 100 g/t,which makes Daxing’anling region one of the the most important silver ore belt in China.However,the metallogenic characteristics and metallogenesis need to be clarified.The silver deposits in the study area are classified into three main types,which are magmatic hydrothermal vein type,continental volcano-subvolcanic type and skarn type,respectively.The supergiant deposits include the Shuangjianzishan deposit(silver metal amount of 15214 t with average grade of 138 g/t),the Baiyinchagandongshan deposit(silver metal amount of 9446 t with average grade of 187 g/t),the Huaobaote deposit(silver metal amount of 6852 t with average grade of 170 g/t),and the Fuxingtun deposit(silver metal amount of 5240 t with average grade of 196 g/t).The silver deposits are mainly distributed in the central and south of the Daxing’anling area,and mainly formed in the Yanshanian period.The silver polymetallic deposits in the Daxinganling area are significantly controlled by regional faults and the junction zone of volcanic rock basins and their margins.The north-east trending deep faults are the most important ore-controlling structures in this area.The distribution of silver polymetallic deposits along the main faults is obvious,and the intersection area of multiple groups of faults often form important mine catchments.The Permian is the most important ore-bearing formation in this area,but some important silver polymetallic deposits occur in Mesozoic volcanic basins or pre-Mesozoic strata.The magmatic rocks related to mineralization are mainly intermediate acidic or acidic intrusions,intermediate acidic lavas,pyroclastic rocks,and small intrusions of ultra-shallow or shallow facies of the Yanshanian Period.The mineralization element combination is mainly determined by the elemental geochemical background of surrounding rocks or source layers.In addition,the type of deposit,the distance from the mineralization center,and the degree of differentiation of ore-forming rock mass are also important influence factors.The article analyzes the prospecting prospects of each silver deposit type in the study area,discusses the relationship between mineralization center and deep prospecting,and proposes that porphyry silver deposits should be paid attention to.In the prospecting and exploration of silver deposits,comprehensive evaluation and multi-target prospecting need to be strengthened because silver can coexist or be associated with a variety of metals.
基金Supported by National Natural Science Foundation of China (31021091, 30971001)Beijing Natural Science Foundation (7102109)Fok Ying Tong Education Foundation (121024)
文摘Objective To determine the spatio-temporal expression of p70S6k activation in hippocampus in mesial temporal lobe epilepsy. Methods Temporal lobe epilepsy model was established by stereotaxically unilateral and intrahip-pocampal injection of kainite acid (KA) in adult male C57BL/6 mice. Latent and chronic epileptogenesis were represented by mice 5 days after KA injection (n=5) and mice 5 weeks after KA injection (n=8), respectively. Control mice (n=5) were injected with saline. Immunohistochemical assays were performed on brain sections of the mice. Results Hippocampus both ipsilateral and contralateral to the KA injection displayed significantly up-regulated pS6 immunoreactivity in dispersed granule cells in 5-day and 5-week model mice. Conclusion The activation of p70S6k is mainly located in the dentate gyrus in KA-induced mouse model of temporal lobe epilepsy, indicating that the activation may be related with the disperse degree and hypertrophy of granule cells.
基金grants from the National Natural Science Foundation of China(No.81771408,No.81771409,and No.81300555)the National Key Research and Development Program of China(No.2016YFC1306202).
文摘Background:Advanced technology has become a valuable tool in etiological studies of intellectual disability/global developmental delay(ID/GDD).The present study investigated the role of genetic analysis to confirm the etiology in ID/GDD patients where the cause of the disease was uncertain in central China.Methods:We evaluated 1051 ID/GDD children aged 6 months to 18 years from March 2009 to April 2017.Data concerning basic clinical manifestations were collected,and the method of etiology confirmation was recorded.Genome-wide copy number variations(CNVs)detection and high-throughput sequencing of exons in the targeted regions was performed to identify genetically-based etiologies.We compared the incidence of different methods used to confirm ID/GDD etiology among groups with differing degrees of ID/GDD using the Chi-square or Fisher exact probability test.Results:We recruited 1051 children with mild(367,34.9%),moderate(301,28.6%),severe(310,29.5%),and profoundly severe(73,6.9%)ID/GDD.The main causes of ID/GDD in the children assessed were perinatal factors,such as acquired brain injury,as well as single gene imbalance and chromosomal gene mutation.We identified karyotype and/or CNVs variation in 46/96(47.9%)of cases in severe ID/GDD patients,which was significantly higher than those with mild and moderate ID/GDD of 34/96(35.4%)and 15/96(15.6%),respectively.A total of 331/536(61.8%)patients with clear etiology have undergone genetic analysis while 262/515(50.9%)patients with unclear etiology have undergone genetic analysis(x^2=12.645,P<0.001).Gene structure variation via karyotype analysis and CNV detection increased the proportion of children with confirmed etiology from 51.0%to 56.3%,and second-generation high-throughput sequencing dramatically increased this to 78.9%.Ten novel mutations were detected,recessive mutations in X-linked genes(ATPase copper transporting alpha and bromodomain and WD repeat domain containing 3)and dominant de novo heterozygous mutations in X-linked genes(cyclin-dependent kinase like 5,protocadherin 19,IQ motif and Sec7 domain 2,and methyl-CpG binding protein 2)were reported in the study.Conclusions:The present study indicates that genetic analysis is an effective method to increase the proportion of confirmed etiology in ID/GDD children and is highly recommended,especially in ID/GDD children with uncertain etiology.
