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fMRI time series analysis based on stationary wavelet and spectrum analysis

Progress in Natural science:Materials International 2006年第11期16卷 1171-1176页

作者： ZHI Lianhe~ 1,2,3 , ZHAO Xia~4. SHAN Baoci~1**, PENG Silong~5, YAN Qiang~1, YUAN Xiuli~1 and TANG Xiaowei~ 1,6 (1. Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of sciences, Beijing 10004., China 2. Graduate School of Chinese Academy of sciences, Beijing 10004., China 3. Department of Physics, Zhoukou Normal university, Zhoukou 4.6100, China 4. research imaging center,{4., san antonio, texas 78229, usa 5. National ASIC Design and Engineering center, Institute of Automation, Chinese Academy of sciences, Beijing 10004., China 6. Department of Physics, Zhejiang university, Hangzhou 310027, China) Key Laboratory of Nuclear Analysis Techniques Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Graduate School of Chinese Academy of sciences Beijing 100049 China Department of Physics Zhoukou Normal University Zhoukou 466100 China research imaging center University of Texas Health Science Center San Antonio TX 78229 United States National ASIC Design and Engineering center Institute of Automation Chinese Academy of Sciences Beijing 100049 China Department of Physics Zhejiang University Hangzhou 310027 China

The low signal to noise ratio (SNR) of functional MRI (fMRI) prefers more sensitive data analysis methods. Based on stationary wavelet transform and spectrum analysis, a new method with high detective sensitivity was developed for analyzing fMRI time series, which does not require any prior assumption of the characteristics of noises. In the proposed method, every component of fMRI time series in the different time-frequency scales of stationary wavelet transform was discerned by the spectrum analysis, then the components from noises were removed using the stationary wavelet transform, finally the components of real brain activation were detected by cross-correlation analysis. The results obtained from both simulated and in vivo visual experiments illustrated that the proposed method has much higher sensitivity than the traditional cross-correlation method.

关键词： fMRI stationary wavelet transform spectrum analysis data analysis.

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Molecular regulation of cardiovascular cell growth and apoptosis in atherosclerotic coronary artery disease

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中国病理生理杂志 2010年第A10期26卷 1947-1948页

作者： Yong-Jian Geng(The center for Cardiovascular Biology and Atherosclerosis research,university of texas {4. science center at Houston,and texas Heart Institute,Houston,usa.)

A balance between growth and apoptosis plays a critical role in maintaining the homeostasis of cardiovascular *** the development of atherosclerosis and atherosclerosis-associated coronary heart disease,many environmental factors exert regulatory effects on cardiovascular cells and their *** have recently investigated several proteins known to protect cells against ischemic damages.

关键词： cardiovascular homeostasis exert maintaining apolipoprotein damages Glucose blocked caspase protect

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Molecular signal transduction in vascular cell apoptosis

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Cell research 2001年第4期11卷 253-264页

作者： GENG YONG JIAN center for Cardiovascular Biology and Atherosclerosis research, Division of Cardiology, Department of Internal Medicine, university of texas Houston {4. science center Medical School, 64.1 Fannin Street, MSB 6.04., Houston, TX 77030, usa Division of Cardiology Department of Internal Medicine Center for Cardiovascular Biology and Atherosclerosis Research University of Texas Houston Health Science Center Medical School Houston USA

Apoptosis is a form of genetically programmed cell death, which plays a key role in regulation of cellularity in a variety of tissue and cell types including the cardiovascular tissues. Under both physiological and pathophysiological conditions, various biophysiological and biochemical factors, including mechanical forces, reactive oxygen and nitrogen species, cytokines, growth factors, oxidized lipoproteins, etc., ma influence apoptosis of vascular cells. The Fas/Fas ligand/caspase death-signaling pathway, Bcl-2 protein family/mitochondria, the tumor suppressive gene p53, and the proto-oncogene c-myc may be activated in atherosclerotic lesions, and mediates vascular apoptosis during the development of atherosclerosis. Abnormal expression and dysfunction of these apoptosis-regulating genes may attenuate or accelerate vascular cell apoptosis and affect the integrity and stability of atherosclerotic plaques. Clarification of the molecular mechanism that regulates apoptosis may help design a new strategy for treatment of atherosclerosis and ii major complication, the acute vascular syndromes.

关键词： Apoptosis vascular cells caspases atherosclerosis cytokines.

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Immunization with chlamydial plasmid protein pORF5 DNA vaccine induces protective immunity against genital chlamydial infection in mice

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science China(Life sciences) 2008年第11期51卷 973-980页

作者： LI ZhongYu1,2, WANG ShiPing1, Wu YiMou2, ZHONG GuangMing3 & CHEN Ding3 1 Xiangya School of Medicine, Central South university, Changsha 4.0078, China 2 Department of Microbiology and Immunology, university of South China, Hengyang 4.1001, China 3 university of texas health science center at san antonio, TX {4., usa Xiangya School of Medicine Central South University Changsha China Department of Microbiology and Immunology University of South China Hengyang China university of texas health science {4. at san antonio San Antonio USA

To validate the immune protective efficacy of pORF5 DNA vaccine and to analyze potential mechanisms related to this protection. In this study, pORF5 DNA vaccine was constructed and evaluated for its protective immunity in a mouse model of genital chlamydial infection. Groups of BALB/c mice were immunized intranasally with pORF5 DNA vaccine. Humoral and cell mediated immune responses were evaluated. The clearance ability of chlamydial challenge from the genital tract and the chlamy- dia-induced upper genital tract gross pathology and histopathological characterization were also de- tected. The results showed that the total and the IgG2a anti-pORF5 antibody levels in serum were sig- nificantly elevated after pcDNA3.1-pORF5 vaccination, as were the total antibody and IgA levels in vaginal fluids. pcDNA3.1-pORF5 induced a significantly high level of Th1 response as measured by robust gamma interferon (IFN-γ). Minimal IL-4.was produced by immune T cells in response to the re-stimulation with pORF5 protein or the inactive elementary body in vitro. pcDNA3.1-pORF5-vacci- nated mice displayed significantly reduced bacterial shedding upon a chlamydial challenge and an accelerated resolution of infection. 100% of pcDNA3.1-pORF5 vaccinated mice successfully resolved the infection by day 24. pcDNA3.1-pORF5-immunized mice also exhibited protection against patho- logical consequences of chlamydial infection. The stimulated index was significantly higher than that of mice immunized with pcDNA3.1 and PBS (P<0.05). Together, these results demonstrated that immu- nization with pORF5 DNA vaccine is a promising approach for eliciting a protective immunity against a genital chlamydial challenge.

关键词： Chlamydia trachomatis pORF5 DNA vaccine immune protection Th1 immune response

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Limbic leptin signaling and depression

Limbic leptin signaling and depression

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中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Xin-Yun LU Departments of Pharmacology and Psychiatry,university of texas health science {4. at san antonio,7703 Floya Curl Drive,san antonio,TX 78229,usa

＜正＞Major depressive disorder is the most common mental illness,affecting roughly 20%of the general population at some point during their *** approximately half of patients respond to existing antidepressant ***,the mechanisms underlying the pathogenesis of depression remain poorly *** is often comorbid with medical conditions such as ***,an adipocyte-derived hormone,is well known for its role in the control of energy homeostasis and body *** research has provided evidence for a novel action of leptin in the regulation of mood and *** leptin levels are reduced in chronic stress models of *** treatment reverses chronic stress-induced depression-like behavioral deficits and impairment of hippocampal *** addition,we have explored limbic leptin signaling in mood-related *** implications of leptin and leptin receptor signaling in human depression will be discussed.

关键词： depression leptin stress hippocampus

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AN INTERIOR TRUST REGION ALGORITHM FOR NONLINEAR MINIMIZATION WITH LINEAR CONSTRAINTS

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Journal of Computational Mathematics 2002年第3期20卷 225-244页

作者： Jian-guo Liu (Department of Mathematics, university of North texas, Denton, TX 76203, usa) Department of Mathematics University of North Texas 美国 Denton

Presents information on a study which analyzed an interior trust-region-based algorithm for linearly constrained minimization problems. Optimality conditions for the linearly constrained minimization problem presented; Vectors for each updating step in the algorithm proposed; Establishment of the convergence properties of the proposed algorithm.

关键词： Nonlinear programming Linear constraints Trust region algorithms Newton methods Interior algorithms Quadratic convergence

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Plasmacytoid dendritic cells in antiviral immunity and autoimmunity

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science China(Life sciences) 2010年第2期53卷 172-182页

作者： TANG Fei1,2,DU Qiumei1,2 & LIU Yong-Jun3 1 center for Infection and Immunity,Institute of Biophysics,Chinese Academy of sciences,Beijing 100101,China 2 Graduate university of Chinese Academy of sciences,Beijing 10004.,China 3 Department of Immunology and center for Cancer Immunology research,university of texas,M.D.Anderson Cancer center,Houston,texas 77030,usa center for Infection and Immunity Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China.

Plasmacytoid dendritic cells (pDCs) represent a unique and crucial immune cell population capable of producing large amounts of type I interferons (IFNs) in response to viral *** function of pDCs as the professional type I IFN-producing cells is linked to their selective expression of Toll-like receptor 7 (TLR7) and TLR9,which sense viral nucleic acids within the endosomal *** I IFNs produced by pDCs not only directly inhibit viral replication but also play an essential role in linking the innate and adaptive immune *** aberrant activation of pDCs by self nucleic acids through TLR signaling and the ongoing production of type I IFNs do occur in some autoimmune ***,pDC may serve as an attractive target for therapeutic manipulations of the immune system to treat viral infectious diseases and autoimmune diseases.

关键词： plasmacytoid dendritic cells type I interferon TLR7 TLR9 antiviral immunity autoimmune diseases

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A general phase retrieval algorithm based on a ptychographical iterative engine for coherent diffractive imaging

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Chinese Physics B 2013年第1期22卷 243-248页

作者：傅健李鹏 research center of Digital Radiation imaging and Biomedical imaging Beijing University of Aeronautics and Astronautics

Coherent diffractive imaging （CDI） is a lensless imaging technique and can achieve a resolution beyond the Rayleigh or Abbe limit. The ptychographical iterative engine （PIE） is a CDI phase retrieval algorithm that uses multiple diffraction patterns obtained through the scan of a localized illumination on the specimen, which has been demonstrated successfully at optical and X-ray wavelengths. In this paper, a general PIE algorithm （gPIE） is presented and demonstrated with an He-Ne laser light diffraction dataset. This algorithm not only permits the removal of the accurate model of the illumination function in PIE, but also provides improved convergence speed and retrieval quality.

关键词： phase retrieval algorithm coherent diffractive imaging ptychography

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Seasonal water storage change of the Yangtze River basin detected by GRACE

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science China Earth sciences 2006年第5期49卷 483-491页

作者： HU Xiaogong1, CHEN Jianli1,2, ZHOU Yonghong1, HUANG Cheng1 & LIAO Xinhao1 1. center for Astro-geodynamics research, Shanghai Astronomical Observatory, National Astronomical Observatories, Shanghai 200030, China 2. center for Space research, {4. of texas at Austin, 3925 W. Braker Lane, Suite 200, Austin, TX78750, usa center for Astro-geodynamics research Shanghai Astronomical Observatory National Astronomical Observatories Shanghai China center for Space research University of Texas at Austin Austin USA

US-Germany co-sponsered satellite gravimetry mission GRACE (Gravity Recovery And Climate Experiment), launched in March 2002, has been producing monthly time series of Earth gravity models up to degree and order of 120. The GRACE mission consists of two identical satellites flying on an almost polar orbit with an altitude of about 300-500 km and satelite-to-satellite ranging of about 220 km. Thanks to the payloads of space-borne GPS receivers, accelerometers and high-precision K-band satelite-to-satellite ranging mesurements, GRACE gravity models are expected to achieve more than one order of magnitude of improvement over previous models at spatial scales of a few hundred kilometers or larger. Recovery of surface mass re-distribution based on GRACE’s time-varying gravity models is applied to studies in solid Earth geophysics, oceanography, climatology and geodesy. At secular time scales, GRACE is expected to provide valuable information on global ice changes, whose variations have profound influences on global climate, and in particular, on sea level changes. At seasonal time scales, GRACE is expected to reveal surface water changes with an ac- curacy of less than 1 cm, or ocean bottom pressure changes with an accuracy of less than 1 mbar (1 mbar =102 Pa). These surface mass redistribution measurements would impove our understanding of the global and regional mass and energy cycles that are critical to human life. Using 15 GRACE monthly gravity models covering the period from April 2002 to December 2003, this study compares seasonal water storage changes recovered from GRACE data and hydrology models at global and regional scales, with particular focus on the Yangtze River basin of China. Annual amplitude of 3.4.cm of equivalent water height change is found for the Yangtze River basin with maximum in Spring and Autumn, agreeing with two state-of-the-art hydrology models. The differences between GRACE re- sults and model predictions are less than 1-2 cm. We conclude

关键词： GRACE, earth gravity, water storage, Yangtze River basin.

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Molecular regulation of cardiovascular cell growth and apoptosis in atherosclerotic coronary artery disease

Molecular regulation of cardiovascular cell growth and apopt...

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中国病理生理学会第九届全国代表大会及学术会议

作者： Yong-Jian Geng (The center for Cardiovascular Biology and Atherosclerosis research,university of texas {4. science center at Houston, and texas Heart Institute,Houston,usa.)

＜正＞A balance between growth and apoptosis plays a critical role in maintaining the homeostasis of cardiovascular *** the development of atherosclerosis and atherosclerosis-associated coronary heart disease,many environmental factors exert regulatory effects on cardiovascular cells and their *** have recently investigated several proteins known to protect cells against ische-

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