2.Analysis of Molecular Profiles Among Trypanozoon Species and Subspecies By MGE-PCR Method
Fengjun LI ; Jiayu ZHENG ; Wanzhong JIA ; Zhaorong LUN
Chinese Journal of Parasitology and Parasitic Diseases 1997;0(05):-
Objective To analyze the relationship between genetic variability and evolution among Trypanosoma brucei (including T. b. brucei, T. b. rhodesiense and T. b. gambiense), T. evansi and T. equiperdum isolates. Methods Genomic DNAs of 26 trypanosome isolates were amplified by a mobile genetic elements (MGE)-PCR technique and cluster analysis was performed based on the molecular profiles with Neighbor-Joining method. Results The genetic variability among trypanosome isolates examined was obvious with an average genetic distance of 41.2% (ranged from 0 to 100%). Similarity coefficient among T. brucei isolates was 41.15% which was lower than that between T. evansi and T. equiperdum isolates. The closest relationship was found between T. evansi and T. brucei isolates with a similarity coefficient of 62.94%. The genetic variability between T. b. rhodesiense and T. b. brucei isolates was higher than that among T. b. gambiense isolates. Conclusion Species and subspecies in Trypanozoon displayed a higher genetic variability; T. equiperdum isolates collected from China and from South America, and T. evansi isolates from China and from South America, should have a similar origin.
3.Analysis of the automatic brightness controlling for x-ray imaging systems.
Yong-li HUANG ; Tan QU ; Kai-lun LU ; Zheng-zi PAN
Chinese Journal of Medical Instrumentation 2002;26(6):402-406
In this paper, the question about automatic brightness control for x-ray imaging systems based on CCD camera is discussed, and the structure and principle of an auto brightness control loop are analyzed along with the working procedure of the x-ray imaging system. A kind of digital brightness controller about a typical device and the designing idea of the computer brightness intelligent control software is introduced.
Algorithms
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Image Processing, Computer-Assisted
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Radiation Protection
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Radiographic Image Enhancement
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instrumentation
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Radiography
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instrumentation
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X-Ray Intensifying Screens
4.Distribution characteristics of pathogenic bacteria in hospitalized HIV/AIDS patients with wound infection in Yunnan
LI Meng-xue ; LIU Jia-fa ; ZHANG Rui ; LI Zheng-lun ; LI Jian-jian ; DENG Xue-mei ; DAI Jia-wei ; ZHANG Mi ; DONG Xing-qi
China Tropical Medicine 2023;23(1):33-
Abstract: Objective To analyze the distribution characteristics of the main pathogens of HIV/AIDS patients with wound infections and provide basis for clinical diagnosis and treatment. Methods The clinical data of 294 patients with positive secretions or pus specimens from 2016 to 2020 were analyzed retrospectively. Results A total of 357 strains of pathogenic bacteria were isolated from 294 cases, of which 123 strains of Gram-negative bacilli (G-b), accounting for 34.5%, were mainly Escherichia coli (15.4%), Klebsiella pneumoniae (3.9%), and Pseudomonas aeruginosa (3.6%); Gram-positive bacilli (G+b) 14 strains, accounting for 3.9%; 108 Gram-positive cocci (G+c), accounting for 30.3%, of which 44 strains were coagulase-positive Staphylococcus aureus (12.3%), Coagulase-negative staphylococci were mainly Staphylococcus epidermidis (4.2%) and Staphylococcus hemolyticus (2.8%); 37 strains of fungi, accounting for 10.4%, were mainly Candida albicans (5.9%); 75 strains of Mycobacterium, accounting for 21.0%, including 41 strains of Mycobacterium tuberculosis (11.5%) and 34 strains of non-tuberculosis mycobacteria (9.5%). 52 of the 294 HIV/AIDS patients had mixed infections, accounting for 17.7%. There was significant difference in the distribution of G+c, G-b, mycobacteria and mixed infection among different specimen sources (P<0.05), and there was significant difference in the distribution of mycobacteria among different CD4+T lymphocyte counts (P<0.05). There was significant difference in the level of CD4+T lymphocytes between patients of different ages (P<0.05), and there was significant difference in the level of CD4+T lymphocytes from postoperative incision and other parts (P<0.05). Conclusions Patients with HIV/AIDS are prone to combined wound infections with various pathogenic bacteria. We should strengthen the research on wound infection in HIV/AIDS patients, and timely send patients with a low number of CD4+T lymphocytes for secretion or pus culture, so as to carry out targeted treatment and improve the prognosis of patients.
5.Interruption failure of heptitis B virus vaccination in mother-to-infant transmission and heptitis B virus genotypes and preC/BCP mutations.
Jia WANG ; Jie LI ; Hui ZHUANG ; She-lan LIU ; Rong-cheng LI ; Yan-ping LI ; Zheng-lun LIANG
Chinese Journal of Epidemiology 2007;28(4):331-333
OBJECTIVETo investigate the association of heptitis B virus (HBV) genotypes and precore(PreC)/basal core promoter(BCP) mutation with interruption failure of HBV vaccination in mother-to-infant transmission.
METHODSA total number of 208 serum samples were collected from infants and mothers,including 16 infants who had become HBsAg-positive despite a complete and timely course of immunization and another 88 infants successfully protected from mother-to infant HBV transmission. HBV genotypes were determined by type-specific primers PCR method. PreC/BCP mutations were detected by direct sequencing of PCR products, and Clustal W 1.8 software was applied to analyzing the sequences.
RESULTSOf 16 mothers who were having vaccine failure infants, 15 (93.8%) were HBeAg positive and infected with genotype C (15/15, 100%). Among 88 mothers of having children being protected by vaccine, 51 (58.0%) were HBeAg positive, with 45.1% (23/51) of genotype C. The proportion of genotype C in HBeAg mothers of infants with vaccine failure, was significantly higher than that of mothers with vaccine protected infants (chi2 = 14.3, P = 0.003). However, the frequencies of T1762/A1764 mutations had no significant differences between genotype C HBeAg positive mothers with vaccine failure or protected infants (33.3% and 13.3%, respectively, P = 0.4). No A1896 mutation was found in these two groups.
CONCLUSIONHBV genotype C might contribute to the immune failure of HBV vaccination in mother-to-infant transmission, while PreC/BCP mutation might not have correlation with it.
Adult ; Female ; Genes, Viral ; Genotype ; Hepatitis B ; immunology ; prevention & control ; transmission ; Hepatitis B Vaccines ; immunology ; Hepatitis B virus ; genetics ; immunology ; Humans ; Infant, Newborn ; Infectious Disease Transmission, Vertical ; prevention & control ; Mutation ; Polymerase Chain Reaction ; Pregnancy ; Pregnancy Complications, Infectious ; immunology ; virology ; Promoter Regions, Genetic
6.Establishment and preliminary application of a gene chip for detection of hepatitis B virus "a" determinant hotpoint mutation.
Rui ZHANG ; Rong-cheng LI ; Yan-ping LI ; Sheng-qi WANG ; Zheng-lun LIANG ; He-min LI ; Hui ZHUANG
Chinese Journal of Hepatology 2007;15(2):103-106
OBJECTIVETo develop a gene chip for rapid detection of the "a" determinant hotpoint mutation of hepatitis B virus (HBV).
METHODSPrimers were designed in the HBV conservative region, and probes for detecting 126A, 126S, 144A, 145R, 145E, 144A+145R, and 144A+145E mutants were developed for that gene chip. PCR amplification and gene chip technology were optimized. The performance of the gene chip was evaluated by detecting the reference plasmids. Forty five samples of serum obtained from patients with chronic hepatitis B were used to compare the sensitivity of the gene chip and the direct sequencing of PCR products.
RESULTSThe oligonucleotide microarray was specific for mutant and native plasmids. The sensitivity of the gene chip was 5 x 10(3)copies/micro l with a high reproducibility. The gene chip could detect minor variants when they were more than 10% among the HBV strains. The positive rates of 126A, 126S-1, 126S-2 detected in the 45 specimens by the gene chip (46.67%, 35.56% and 24.44%, respectively) were higher than those detected by direct sequencing of PCR products (9.00%, 4.44% and 2.22%; P=0.000, P=0.000 and P=0.002, respectively). The sequencing of cloned PCR products demonstrated that the gene chip was specific for the "a" determinant hotpoint mutation detection.
CONCLUSIONHBV "a" determinant hotpoint mutations can be detected by oligonucleotide microarray with high sensitivity and specificity, providing a method for large scale screening of the mutants.
Hepatitis B ; blood ; diagnosis ; Hepatitis B virus ; genetics ; Humans ; Oligonucleotide Array Sequence Analysis ; methods ; Point Mutation
7.Therapeutic effect and safety of transcatheter occlusion of ventricular septal defects in 50 patients.
Da-Jun HU ; Chuan-Chang LI ; Xiao-Qun PU ; Zhao-Fen ZHENG ; Yang-Cheng ZHAO ; Tian-Lun YANG
Journal of Central South University(Medical Sciences) 2005;30(5):587-589
OBJECTIVE:
To determine the therapeutic effect and safety of transcatheter closure of ventricular septal defects (VSD) in 50 patients.
METHODS:
Fifty patients were diagnosed by transthoracic echocardiography. To perform the operation, transthoracic echocardiography and X ray were used continuously to monitor the procedure. Transthoracic echocardiography and ECG were performed at 1, 3, and 6 months after the operation to evaluate the therapeutic effect.
RESULTS:
The VSD diameter ranged from 1.8 to 13.4 (5.54 +/- 2. 75) mm. The successful rate of the operation was 96.0%, and the complication rate of the operation was 16.7%. A 3 month follow-up was completed in 20 patients, and the median left ventricle end-diastolic dimension significantly decreased from (40.20 +/- 8.80) mm to (32.90 +/- 8.36) mm (P < 0.001).
CONCLUSION
Transcatheter closure of ventricular septal defects is a good method with a high success rate of placement, fewer complications, and a good occlusion effect.
Adolescent
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Adult
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Balloon Occlusion
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adverse effects
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instrumentation
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methods
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Cardiac Catheterization
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methods
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Child
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Child, Preschool
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Echocardiography
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Female
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Heart Septal Defects, Ventricular
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diagnostic imaging
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therapy
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Humans
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Male
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Prostheses and Implants
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Treatment Outcome
8.Advances in research of ketamine addiction mechanism.
Wei-Li LIU ; Shi-Zhong BIAN ; Zhen-Lun GU ; Xiao-Gang JIANG ; Zheng-Hong QIN
Journal of Forensic Medicine 2009;25(3):200-207
Ketamine is a phencyclidine derivative acting primarily as a noncompetitive antagonist of N-methyl-D-aspartate (NMDA) excitatory glutamate receptors. As a common intravenous anaesthetic in clinic, it is also increasingly abused because of its hallucination and addiction effects. Based on the pharmacological and toxicologic characteristics of ketamine and the acknowledged addiction mechanism of other abused drugs, this article reviews the possible addiction mechanism of the ketamine in the aspects of its enhanced effects and reward systems, the anatomic structures, the related receptors and the individual differences.
Anesthetics, Dissociative/adverse effects*
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Animals
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Brain/drug effects*
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Humans
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Illicit Drugs
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Ketamine/adverse effects*
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Mental Disorders/chemically induced*
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Rats
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Receptors, Dopamine/drug effects*
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Receptors, N-Methyl-D-Aspartate/drug effects*
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Substance-Related Disorders
9.Regulatory genes controlling neural stem cells differentiation into neurons.
Li ZHANG ; E-mail: ZHQIN5@HOTMAIL.COM. ; Zhen-Lun GU ; Zheng-Hong QIN
Neuroscience Bulletin 2006;22(5):294-300
The recent progress in neural stem cells (NSCs) research has shed lights on possibility of repair and restoration of neuronal function in neurodegenerative diseases using stem cells. Induction of stem cells differentiate into mature neurons is critical to achieve the clinical applications of NSCs. At present, molecular mechanisms modulating NSC differentiation are not fully understood. Differentiation of stem cells into neuronal and glial cells involves an array of changes in expression of transcription factors. Transcription factors then trigger the expression of a variety of central nervous system (CNS) genes that lead NSCs to differentiate towards different cell types. In this paper, we summarized the recent findings on the gene regulation of NSCs differentiation into neuronal cells.
10.Correlation between nonalcoholic fatty liver disease and three anthropometric indices.
Li JIANG ; Xue-wan CHEN ; Rui-dan ZHENG ; Jia-rong MENG ; Lun-gen LU
Journal of Southern Medical University 2010;30(5):1009-1011
OBJECTIVETo investigate the correlation between nonalcoholic fatty liver disease (NAFLD) and three anthropometric indices, namely waist to hip ratio (WHR), body mass index (BMI) and waist to height ratio (WHtR).
METHODSThis retrospective case-control study involved 77 NAFLD patients and 50 patients without such disease, and their data of the 3 anthropometric indices were collected. Risk correlation analysis and Mantel-Haenszel chi-square test were used for correlation analysis.
RESULTSNAFLD was significantly correlated to WHR (chi(2)(MH)=59.609, P<0.001; odds ratio=30.522, 95% CI 12.815-72.695), WHtR (chi(2)(MH)=45.316, P<0.001; odds ratio=21.037, 95% CI 8.665-51.072) and showed a dose-response relationship with BMI (chi(2)=25.017, P<0.001).
CONCLUSIONThese results support a close correlation between NAFLD and the 3 anthropometric indices, indicating that BMI, WHR and WHtR can be significant predictors of NAFLD and have potential value for evaluating and predicting NAFLD.
Adolescent ; Adult ; Anthropometry ; Body Constitution ; Body Height ; Body Mass Index ; Case-Control Studies ; Fatty Liver ; diagnosis ; Female ; Humans ; Male ; Middle Aged ; Non-alcoholic Fatty Liver Disease ; Retrospective Studies ; Waist Circumference ; Waist-Hip Ratio ; Young Adult