Studies have shown that PARK1 gene is associated with the autosomal dominant inheritance of Parkinson's disease. PARK1 gene contains two mutation sites, namely Ala30Pro and Ala53Thr, which are located on exons 3 and ...Studies have shown that PARK1 gene is associated with the autosomal dominant inheritance of Parkinson's disease. PARK1 gene contains two mutation sites, namely Ala30Pro and Ala53Thr, which are located on exons 3 and 4, respectively. However, the genetic loci of the pathogenic genes remain unclear. In this study, blood samples were collected from 11 members of a family with high prevalence of Parkinson's disease, including four affected cases, five suspected cases and two non-affected cases. Point mutation screening of common mutation sites on PARK1 gene exon 4 was conducted using PCR, to determine the genetic loci of the causative gene for Parkinson's disease. Gene identification and sequencing results showed that a T base deletion mutation was observed in the PARK1 gene exon 4 of all 11 collected samples. It was confirmed that the PARK1 gene exon 4 gene mutation is an important pathogenic mutation for Parkinson's disease.展开更多
BACKGROUND: Interleukin 1β-converting enzyme (ICE) gene expression can induce neuronal apoptosis. However, the dynamic changes in ICE gene expression and its effects on neuronal apoptosis under cerebral ischemia/r...BACKGROUND: Interleukin 1β-converting enzyme (ICE) gene expression can induce neuronal apoptosis. However, the dynamic changes in ICE gene expression and its effects on neuronal apoptosis under cerebral ischemia/reperfusion conditions remain unclear. OBJECTIVE: To observe neuronal apoptosis and changes in ICE gene expression in the frontal cortex and hippocampus following ischemia/reperfusion injury. DESIGN, TIME AND SETTING: A randomized, controlled animal study was conducted at the Laboratory of Experimental Animal Center, the Second Hospital of Jilin University and Central Laboratory, the Second Hospital of Jilin University, China, from November 2008 to September 2009. MATERIALS: The ICE gene primer sequence (TaKaPa Co., Dalian, China), FACScan Flow cytometer (Becton Dickinson, Franklin Lakes, N J, USA), and Perkin Elmer GeneAmp PCR system 2400 (Perkin Elmer, Waltham, MA, USA) were used in this study. METHODS: A total of 45 healthy, adult, male, Kunming mice were randomly assigned to normal control (n = 5), sham surgery (n = 5), and model (n = 35) groups. The mice in the model group were equally and randomly subdivided into seven subgroups according to various reperfusion time points (1 hour, 1,3, 7, 14, 28, and 42 days). Animal models of ischemia/reperfusion injury were established by bilateral carotid artery ligation in the model group. The mice in the sham surgery group only received saline perfusion and surgery for carotid artery exposure. MAIN OUTCOME MEASURES: Neuronal apoptosis in the frontal cortex and hippocampus of mice was measured using flow cytometry. The time course of ICE mRNA levels in the frontal cortex and hippocampus were quantified using reverse transcription-polymerase chain reaction. RESULTS: Neuronal apoptosis in the frontal cortex and hippocampus peaked at 3 days following ischemia/reperfusion injury (P 〈 0.05). ICE mRNA expression increased in the frontal cortex at 1 day following ischemia/reperfusion injury (P 〈 0.05), decreased at 3 days, and then peaked at 14 days (P 〈 0.05). ICE mRNA expression increased in the hippocampus at 3 days following ischemia/reperfusion injury (P 〈 0.05), peaked at 7 days (P 〈 0.05), and then decreased gradually to normal levels at 28 days. CONCLUSION: Neuronal apoptosis peaked at 3 days following ischemia/reperfusion injury, and both apoptosis and ICE mRNA levels remained high for 2 weeks after injury. Early apoptosis may result from increased ICE mRNA expression.展开更多
Purpose:This paper describes a comprehensive user survey carried out in China to investigate public needs for government information service in libraries.It is expected to provide insights into the ways to help public...Purpose:This paper describes a comprehensive user survey carried out in China to investigate public needs for government information service in libraries.It is expected to provide insights into the ways to help public libraries meet the user needs.Design/methodology/approach:The paper is founded on a survey among library users,librarians and non-library users.Paper questionnaires were distributed in the National Library of China and 32 provincial public libraries in China and electronic questionnaires were sent to non-library users.A total of 909 valid questionnaires were collected.Findings:A lot of attention is paid to policies,laws and regulations relating to common people’s work and lives such as science,technology,education,culture,finance,market supervision,health care,sports,urban construction and environment protection.A wide variety of government information resources is needed and information delivered to users shall be accurate and timely.Internet has become the main means of accessing government information and mobile phones the preferred Web access channel,while printed materials are considered important information sources.Users need assistance and training in the use of library information resources and services.Research limitations:The sample was limited to respondents from provincial-level public libraries,but city and county-level library users were not included.Practical implications:The survey results are beneficial for the Chinese public libraries to design service programs and improve their services.Originality/value:The paper is one of the comprehensive surveys on public needs for government information service in the Chinese libraries and some of die findings will be of wider interest for other libraries.展开更多
This paper deals with an alternative proof of Beurling-Lax theorem by adopting a constructive approach instead of the isomorphism technique which was used in the original proof.
We use the Weyl correspondence approach to investigate the spectral operators of the Laguerre and the Kautz systems. We show that the basic functions in the Laguerre and the Kautz systems are the eigenvectors of modif...We use the Weyl correspondence approach to investigate the spectral operators of the Laguerre and the Kautz systems. We show that the basic functions in the Laguerre and the Kautz systems are the eigenvectors of modified Sturm-Liouville operators. The results are further generalized to multiple parameters of one complex variable in both the unit disc and the upper half-plane contexts.展开更多
基金Supported by a Foundation of Science and Technology Department of Jilin Province, No. 200905152
文摘Studies have shown that PARK1 gene is associated with the autosomal dominant inheritance of Parkinson's disease. PARK1 gene contains two mutation sites, namely Ala30Pro and Ala53Thr, which are located on exons 3 and 4, respectively. However, the genetic loci of the pathogenic genes remain unclear. In this study, blood samples were collected from 11 members of a family with high prevalence of Parkinson's disease, including four affected cases, five suspected cases and two non-affected cases. Point mutation screening of common mutation sites on PARK1 gene exon 4 was conducted using PCR, to determine the genetic loci of the causative gene for Parkinson's disease. Gene identification and sequencing results showed that a T base deletion mutation was observed in the PARK1 gene exon 4 of all 11 collected samples. It was confirmed that the PARK1 gene exon 4 gene mutation is an important pathogenic mutation for Parkinson's disease.
文摘BACKGROUND: Interleukin 1β-converting enzyme (ICE) gene expression can induce neuronal apoptosis. However, the dynamic changes in ICE gene expression and its effects on neuronal apoptosis under cerebral ischemia/reperfusion conditions remain unclear. OBJECTIVE: To observe neuronal apoptosis and changes in ICE gene expression in the frontal cortex and hippocampus following ischemia/reperfusion injury. DESIGN, TIME AND SETTING: A randomized, controlled animal study was conducted at the Laboratory of Experimental Animal Center, the Second Hospital of Jilin University and Central Laboratory, the Second Hospital of Jilin University, China, from November 2008 to September 2009. MATERIALS: The ICE gene primer sequence (TaKaPa Co., Dalian, China), FACScan Flow cytometer (Becton Dickinson, Franklin Lakes, N J, USA), and Perkin Elmer GeneAmp PCR system 2400 (Perkin Elmer, Waltham, MA, USA) were used in this study. METHODS: A total of 45 healthy, adult, male, Kunming mice were randomly assigned to normal control (n = 5), sham surgery (n = 5), and model (n = 35) groups. The mice in the model group were equally and randomly subdivided into seven subgroups according to various reperfusion time points (1 hour, 1,3, 7, 14, 28, and 42 days). Animal models of ischemia/reperfusion injury were established by bilateral carotid artery ligation in the model group. The mice in the sham surgery group only received saline perfusion and surgery for carotid artery exposure. MAIN OUTCOME MEASURES: Neuronal apoptosis in the frontal cortex and hippocampus of mice was measured using flow cytometry. The time course of ICE mRNA levels in the frontal cortex and hippocampus were quantified using reverse transcription-polymerase chain reaction. RESULTS: Neuronal apoptosis in the frontal cortex and hippocampus peaked at 3 days following ischemia/reperfusion injury (P 〈 0.05). ICE mRNA expression increased in the frontal cortex at 1 day following ischemia/reperfusion injury (P 〈 0.05), decreased at 3 days, and then peaked at 14 days (P 〈 0.05). ICE mRNA expression increased in the hippocampus at 3 days following ischemia/reperfusion injury (P 〈 0.05), peaked at 7 days (P 〈 0.05), and then decreased gradually to normal levels at 28 days. CONCLUSION: Neuronal apoptosis peaked at 3 days following ischemia/reperfusion injury, and both apoptosis and ICE mRNA levels remained high for 2 weeks after injury. Early apoptosis may result from increased ICE mRNA expression.
基金supported by the National Social Science Foundation of China(Grant No.:10BTQ021)
文摘Purpose:This paper describes a comprehensive user survey carried out in China to investigate public needs for government information service in libraries.It is expected to provide insights into the ways to help public libraries meet the user needs.Design/methodology/approach:The paper is founded on a survey among library users,librarians and non-library users.Paper questionnaires were distributed in the National Library of China and 32 provincial public libraries in China and electronic questionnaires were sent to non-library users.A total of 909 valid questionnaires were collected.Findings:A lot of attention is paid to policies,laws and regulations relating to common people’s work and lives such as science,technology,education,culture,finance,market supervision,health care,sports,urban construction and environment protection.A wide variety of government information resources is needed and information delivered to users shall be accurate and timely.Internet has become the main means of accessing government information and mobile phones the preferred Web access channel,while printed materials are considered important information sources.Users need assistance and training in the use of library information resources and services.Research limitations:The sample was limited to respondents from provincial-level public libraries,but city and county-level library users were not included.Practical implications:The survey results are beneficial for the Chinese public libraries to design service programs and improve their services.Originality/value:The paper is one of the comprehensive surveys on public needs for government information service in the Chinese libraries and some of die findings will be of wider interest for other libraries.
基金supported by the Multi-Year Research Grant(No.MYRG115(Y1-L4)-FST13-QT)the Multi-Year Research Grant(No.MYRG116(Y1-L3)-FST13-QT)+1 种基金Macao Government(No.FDCT098/2012/A3)the Natural Science Foundation of Guangdong Province(No.S2011010004986)
文摘This paper deals with an alternative proof of Beurling-Lax theorem by adopting a constructive approach instead of the isomorphism technique which was used in the original proof.
基金supported by National Natural Science Foundation of China(Grant Nos.11571083,11971178 and 11701597)the starting grant of South China Agricultural Universitythe Science and Technology Development Fund,Macao SAR(Grant Nos.154/2017/A3,079/2016/A2 and FDCT 0123/2018/A3)
文摘We use the Weyl correspondence approach to investigate the spectral operators of the Laguerre and the Kautz systems. We show that the basic functions in the Laguerre and the Kautz systems are the eigenvectors of modified Sturm-Liouville operators. The results are further generalized to multiple parameters of one complex variable in both the unit disc and the upper half-plane contexts.