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Zhao YF, Zhao BQ, Ma KJ, Zhang J, Chen FY. [Forensic Analysis for 54 Cases of Suxamethonium Chloride Poisoning]. FA YI XUE ZA ZHI 2017; 33:374-375. [PMID: 29219267 DOI: 10.3969/j.issn.1004-5619.2017.04.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Indexed: 11/18/2022]
Abstract
OBJECTIVES To observe and analyze the performance of forensic science in the cases of suxa- methonium chloride poisoning, and to improve the identification of suxamethonium chloride poisoning. METHODS Fifty-four cases of suxamethonium chloride poisoning were collected. The rules of determination of suxamethonium chloride poisoning were observed by the retrospective analysis of pathological and toxicological changes as well as case features. RESULTS The pathological features of suxamethonium chloride poisoning were similar to the general changes of sudden death, which mainly included acute pulmonary congestion and edema, and partly showed myocardial disarray and fracture. Suxamethonium chloride could be detected in the heart blood of all cases and in skin tissue of part cases. CONCLUSIONS Suxa-methonium chloride poisoning has the characteristics with fast death and covert means, which are difficult to rescue and easily miss inspection. For the cases of sudden death or suspicious death, determination of suxamethonium chloride should be taken as a routine detection index to prevent missing inspection.
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Liu D, Wang LN, Li HX, Huang P, Qu LB, Chen FY. Pentoxifylline plus ACEIs/ARBs for proteinuria and kidney function in chronic kidney disease: a meta-analysis. J Int Med Res 2017; 45:383-398. [PMID: 28415944 PMCID: PMC5536675 DOI: 10.1177/0300060516663094] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Objective This meta-analysis aimed to investigate the efficacy and safety of pentoxifylline (PTF) plus angiotensin-converting enzyme inhibitors (ACEIs)/angiotensin receptor blockers (ARBs) for proteinuria and kidney function in chronic kidney disease (CKD). Methods CENTRAL, EMBASE, Ovid-MEDLINE, PubMed, and CNKI were searched for relevant, randomized, controlled trials (RCTs). A meta-analysis was performed to review the effect of PTF plus ACEIs/ARBs vs. ACEIs/ARBs alone on proteinuria and kidney function in CKD. Results Eleven RCTs including 705 patients were retrieved. PTF plus ACEI/ARB treatment significantly decreased proteinuria in patients with CKD within 6 months (standard mean difference [SMD] −0.52; 95% CI −0.90 to 0.15; I2 = 68%) and significantly attenuated a decrease in estimated glomerular filtration rate (eGFR) in patients with stages 3–5 CKD after 6 months of treatment (standard mean difference [SMD] 0.30; confidence limit [Cl] 95% CI 0.06 to 0.54; I2 = 0%). PTF plus ACEIs/ARBs for 9 to 12 months significantly reduced albuminuria in patients with CKD (SMD−0.30, 95% CI −0.57 to 0.03; I2 = 0%) and alleviated the decline in eGFR in patients with stages 3–5 CKD (SMD 0.51; 95% CI 0.06 to 0.96; I2 = 61%). Conclusion The combination of an ACEI or ARB and PTF has a protective effect in reducing proteinuria by ameliorating the decline in eGFR in patients with stages 3–5 CKD.
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Wang SQ, Xia J, Chen J, Lu JX, Wei YB, Chen FY, Huang GY, Shi JS, Yu YL. Influence of biological scaffold regulation on the proliferation of chondrocytes and the repair of articular cartilage. Am J Transl Res 2016; 8:4564-4573. [PMID: 27904662 PMCID: PMC5126304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 02/19/2016] [Indexed: 06/06/2023]
Abstract
PURPOSE To investigate the effects of hard tissue engineering scaffold (the material is β-TCP) with different micro-structures on the proliferation of chondrocytes, and the influence of its composite erythrocytes on the repair of articular cartilage defects. METHODS Rabbit cartilage cells were on β-TCP bioceramic scaffold with different micro-structures in vitro, the proliferation growth trend of chondrocytes within the scaffold was calculated, and a optimal micro-structure suitable for cartilage cell growth was determined. Composite chondrocytes were implanted into rabbit models of articular cartilage defects, and the repair situation was observed. RESULTS the bioceramic scaffold with an inner diameter of 120 μm and an aperture of 500-630 μm was suitable for the growth of cartilage cells. Scaffold loaded with second generation of cartilage cell suspension got a top histological score of 20.76±2.13, which was closely similar to that of normal cartilage. CONCLUSION When loaded with the second generation of cartilage cells, the β-TCP biological ceramic scaffold with a pore size of 500-630 μm, and an inner diameter of 120 μm, shows a best repairing effect on animal articular cartilage defects.
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Chen FY, Lan YZ, Han MM, Feng YL. Two new coordination polymers based on tartaric acid ligand: Syntheses, crystal structure and thermal stability. CRYSTALLOGR REP+ 2016. [DOI: 10.1134/s1063774516050072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zhao L, Chen FY, Wang L. [Trimethyltin chloride intoxication in China: a systematic review and meta-analysis]. ZHONGHUA LAO DONG WEI SHENG ZHI YE BING ZA ZHI = ZHONGHUA LAODONG WEISHENG ZHIYEBING ZAZHI = CHINESE JOURNAL OF INDUSTRIAL HYGIENE AND OCCUPATIONAL DISEASES 2016; 34:600-604. [PMID: 27682669 DOI: 10.3760/cma.j.issn.1001-9391.2016.08.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
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Chen Y, Zhao JY, Shan X, Han XL, Tian SG, Chen FY, Su XT, Sun YS, Huang LY, Han L. A point-prevalence survey of healthcare-associated infection in fifty-two Chinese hospitals. J Hosp Infect 2016; 95:105-111. [PMID: 28007308 DOI: 10.1016/j.jhin.2016.08.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 08/10/2016] [Indexed: 11/29/2022]
Abstract
BACKGROUND Healthcare-associated infection (HCAI) represents a major problem for patient safety worldwide. AIM To demonstrate the prevalence, causative agents, and risk factors for HCAI in Chinese hospitals. METHODS A one-day point-prevalence survey was conducted in 52 Chinese hospitals between October 2014 and March 2015. A web-based software system was developed for data entry and management. FINDINGS Among 53,939 patients surveyed, the prevalence of patients with at least one HCAI was 3.7%. Of 2182 HCAI episodes, the most frequently occurring types were lower respiratory tract infections (47.2%), followed by urinary tract infection (12.3%), upper respiratory tract infection (11.0%), and surgical site infection (6.2%). The prevalence of patients with at least one HCAI in critical care units was highest (17.1%). Device-associated infections, including ventilator-associated pneumonia, catheter-associated urinary tract infection, and central catheter-associated bloodstream infection, accounted for only 7.9% of all HCAIs. The most frequently isolated micro-organisms were Pseudomonas aeruginosa [206 infections (9.4%)], Acinetobacter baumannii [172 infections (7.9%)], Klebsiella pneumoniae [160 infections (7.3%)], and Escherichia coli [145 infections (6.6%)]. Of the survey patients (18,206/53,939), 33.8% were receiving at least one antimicrobial agent at the time of the survey. Risk factors for HCAI included older age (≥80 years), male gender, days of hospital admission, admission into a critical care unit, and device utilization. CONCLUSION Our study suggests that the overall prevalence of HCAI in surveyed Chinese hospitals was lower than that reported from most European countries and the USA. More attention should be given to the surveillance and prevention of non-device-associated HCAI in China.
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Han YC, Zeng XG, Xiang FY, Ren L, Chen FY, Gu YC. Distribution and Characteristics of Colletotrichum spp. Associated with Anthracnose of Strawberry in Hubei, China. PLANT DISEASE 2016; 100:996-1006. [PMID: 30686149 DOI: 10.1094/pdis-09-15-1016-re] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Anthracnose caused by Colletotrichum spp. is a serious disease of strawberry. The etiology of anthracnose of strawberry is complex, and several Colletotrichum spp. have been regarded as causal agents. In the present study, multilocus (actin, β-tubulin, calmodulin, glyceraldehyde-3-phosphate dehydrogenase, and chitin synthase) phylogenetic analysis revealed that 100 isolates of Colletotrichum associated with anthracnose of strawberry in central China belong to five species. In total, 97 isolates were identified belonging to the Colletotrichum gloeosporioides species complex, with C. murrayae, C. gloeosporioides, C. fructicola, and C. aenigma accounting for 81, 8, 4, and 4% of the total isolates, respectively. Three isolates belonging to the C. acutatum complex were identified as C. nymphaeae. On inoculated strawberry plants, isolates of C. fructicola and C. murrayae species showed strong pathogenicity to both leaves and petioles of strawberry, with plant mortality 30 days after inoculation of 77.8 and 55.6%, respectively. C. gloeosporioides, C. aenigma, and C. nymphaeae showed strong pathogenicity to leaves but weak pathogenicity to petioles, with plant mortality 30 days after inoculation of 5.6, 16.7, and 11.1%, respectively. The five species were divided into four classes based on their maximum growth temperatures. Isolates of C. murrayae and C. gloeosporioides were more tolerant to high temperature (>34°C) than isolates of other species, followed by C. fructicola and C. aenigma. Isolates of C. nymphaeae, which are only distributed in areas of higher altitude (1,100 m), were highly sensitive to higher temperature. These results indicate that pathogenicity and adaptation to temperature are important factors in the distribution of Colletotrichum spp. on strawberry plants. This research may increase our understanding of how Colletotrichum spp. emerge and spread to geographical regions with different latitudes or elevations.
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Chen FY, Gu ZJ, Yi JW, Xu XZ, Kulkarni P, Tang Q. The evaluation of lanthanum trapped prussian blue as a phosphate binding agent with reduced bone uptake. NEW J CHEM 2016. [DOI: 10.1039/c5nj03126e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lanthanum trapped Prussian blue is developed as a two-process-independent phosphate binder with the main feature of reduced lanthanum accumulation.
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Huang J, Du FL, Yao Y, Wan Q, Wang XS, Chen FY. Numerical magnitude processing in abacus-trained children with superior mathematical ability: an EEG study. J Zhejiang Univ Sci B 2015; 16:661-71. [PMID: 26238541 DOI: 10.1631/jzus.b1400287] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Distance effect has been regarded as the best established marker of basic numerical magnitude processes and is related to individual mathematical abilities. A larger behavioral distance effect is suggested to be concomitant with lower mathematical achievement in children. However, the relationship between distance effect and superior mathematical abilities is unclear. One could get superior mathematical abilities by acquiring the skill of abacus-based mental calculation (AMC), which can be used to solve calculation problems with exceptional speed and high accuracy. In the current study, we explore the relationship between distance effect and superior mathematical abilities by examining whether and how the AMC training modifies numerical magnitude processing. Thus, mathematical competencies were tested in 18 abacus-trained children (who accepted the AMC training) and 18 non-trained children. Electroencephalography (EEG) waveforms were recorded when these children executed numerical comparison tasks in both Arabic digit and dot array forms. We found that: (a) the abacus-trained group had superior mathematical abilities than their peers; (b) distance effects were found both in behavioral results and on EEG waveforms; (c) the distance effect size of the average amplitude on the late negative-going component was different between groups in the digit task, with a larger effect size for abacus-trained children; (d) both the behavioral and EEG distance effects were modulated by the notation. These results revealed that the neural substrates of magnitude processing were modified by AMC training, and suggested that the mechanism of the representation of numerical magnitude for children with superior mathematical abilities was different from their peers. In addition, the results provide evidence for a view of non-abstract numerical representation.
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Chen FY, Gu ZJ, Wan HP, Xu XZ, Tang Q. Manganese Nanosystem for New Generation of MRI Contrast Agent. ACTA ACUST UNITED AC 2015. [DOI: 10.1166/rnn.2015.1066] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Pan JN, Li CI, Chen FY. Evaluating environmental performance using new process capability indices for autocorrelated data. ENVIRONMENTAL MONITORING AND ASSESSMENT 2014; 186:6369-6384. [PMID: 24898520 DOI: 10.1007/s10661-014-3861-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Accepted: 05/21/2014] [Indexed: 06/03/2023]
Abstract
Traditionally, the process capability index is developed by assuming that the process output data are independent and follow normal distribution. However, in most environmental cases, the process data are autocorrelated. The autocorrelated process, if unrecognized as an independent process, can lead to erroneous decision making and unnecessary quality loss. In this paper, three new capability indices with unbiased estimators are proposed to relieve the independence assumption for the-nominal-the-best and the-smaller-the-better cases. Furthermore, we use mean squared error (MSE) and mean absolute percent error (MAPE) to compare the accuracy of our proposed indices to previous autocorrelated indices. The results show that our proposed capability indices outperform the predecessors.
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Shi J, Xia J, Wei Y, Wang S, Wu J, Chen F, Huang G, Chen J. Three-dimensional virtual reality simulation of periarticular tumors using Dextroscope reconstruction and simulated surgery: a preliminary 10-case study. Med Sci Monit 2014; 20. [PMID: 24961404 PMCID: PMC4076173 DOI: 10.12659/msm.8897770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND Dextroscope® three-dimensional (3D) imaging has been extensively used to generate virtual reality (VR) workspaces for neurosurgery and laparoscopy, but few applications have been reported for orthopedic surgery. Here, we investigated orthopedic periarticular tumor surgery planning and anatomical characteristics using a Dextroscope. MATERIAL AND METHODS Patients undergoing surgery for periarticular tumors (n=10) between October 2008 and June 2010 were enrolled and presurgically subjected to computed tomography (CT), magnetic resonance imaging (MRI), and MRI angiography (MRI-A). Imaging data were transferred and integrated in a Dextroscope to produce a VR simulation. The presurgical 3D anatomical reconstructions and intraoperative anatomical characteristics (virtual vs. actual data) and surgical approach (virtual vs. actual situation) measurement and subjective appearance were compared. RESULTS Anatomical characteristics in the area of interest and tumor diameters in all 3 planes (superior-inferior, medial-lateral, and anteroposterior) were consistent between virtual and actual data (3.92±1.22, 1.96±0.53, and 1.73±0.44 vs. 3.92±1.13, 1.91±0.44, and 1.81±0.41; P=0.99, 0.24, and 0.09, respectively). However, the virtual surgical situations were inconsistent with the actual intraoperative situation in many cases, leading to complications. The resolutions of the original CT, MRI, and MRI-A images directly correlated with 3D simulation quality, with soft tissues most poorly represented. Tumor tissue imaging quality in 3D varied extensively by tumor type. CONCLUSIONS Anatomical structures of periarticular tumors can be reconstructed using the Dextroscope system with good accuracy in the case of simple fenestration, increasing treatment individualization, surgical competence level, and potentially reducing intraoperative complications. However, further specialization of VR tools for use in orthopedic applications that involve specialized tools and procedures, such as drilling and implant placement, are urgently need.
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Shi J, Xia J, Wei Y, Wang S, Wu J, Chen F, Huang G, Chen J. Three-dimensional virtual reality simulation of periarticular tumors using Dextroscope reconstruction and simulated surgery: a preliminary 10 case study. Acta Orthop Belg 2014; 80:132-138. [PMID: 24873098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
UNLABELLED Dextroscope three-dimensional (3D) imaging has been extensively applied for generation of virtual reality (VR) workspaces for in neurosurgery and laparoscopy, though few applications in orthopedic surgery have been reported. Patients undergoing surgery for periarticular tumors (n = 10) from Oct. 2008 to Jun. 2010 were enrolled and presurgically subjected to computed tomography (CT), magnetic resonance imaging (MRI), and MRI angiography (MRI-A). Imaging data was transferred and integrated in Dextroscope, producing a VR simulation. Resultant presurgical 3D anatomical reconstructions and intraoperative anatomical characteristics (virtual vs. actual data) and surgical approach (virtual vs. actual situation) measurement and subjective appearance were compared. Anatomical characteristics in the area of interest and tumor diameters were consistent between virtual and actual data. However, the virtual surgical situations remained inconsistent with the actual intraoperative situation in many cases, leading to complications. The resolution of original CT, MRI, and MRI-A images directly correlated with the quality of 3D simulations, with soft tissues most poorly represented. Tumor tissue imaging quality in 3D varied extensively by tumor type. CONCLUSIONS Anatomical structures of periarticular tumors can be reconstructed using the Dextroscope system with good accuracy in the case of simple fenestration, increasing individualization of treatment, surgical competence level, and potentially reducing intraoperative complications. However, further specialization of VR tools for use in orthopedic applications that involve specialized tools and procedures, such as drilling and implant placement, are urgently required.
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Chen FY, Lu LM, Ni HZ, Wang Y, Wang YG, Li GQ. First Report of Pestalotiopsis mangiferae and P. vismiae Causing Twig Dieback of Myrica rubra in China. PLANT DISEASE 2012; 96:588. [PMID: 30727446 DOI: 10.1094/pdis-12-11-1054-pdn] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Chinese bayberry (Myrica rubra Siebold & Zucc.), an evergreen fruit tree, is widely grown in southern China. In 1999, severe twig dieback was observed on M. rubra in Taizhou and it spread to several major M. Rubra-producing areas of Zhejiang covering more than 6,000 ha by 2011. Symptoms were usually observed from June to November and first appeared as chlorosis of leaves and leaf drop, followed by the formation of dark brown lesions covered with white mycelia surrounding leaf scars. The lesions can extend to the whole twig and tree causing discoloration of the xylem. In most cases, infected trees die within 1 to 4 years. Two distinct fungi totaling 46 isolates were isolated from the surface-disinfested diseased twigs and cultured on potato dextrose agar (PDA) at 28°C. An isolate of each fungus, designated as C1 and B1, was characterized further following 10 days of growth on PDA at 28°C. C1 formed zonate, white colonies and black, acervular conidiomata with the conidia aggregated on acervuli as a creamy mass. Isolate B1 formed nonzonate, white colonies and black, acervular conidiomata with the conidia aggregated on acervuli as droplets. Conidia for each isolate were fusiform with five cells; one hyaline apical cell, one hyaline basal cell, and three, dark brown median cells. Conidia ranged from 17.8 to 25.2 × 6.7 to 9.2 μm for C1 and 21.2 to 27.8 × 4.3 to 7.5 μm for B1. There were two to three hyaline, filamentous appendages (9.8 to 23.5 μm long for C1 and 10.5 to 25.5 μm long for B1) attached to each apical cell, and one hyaline appendage (3.5 to 7.2 μm long for C1 and 3.0 to 6.8 μm long for B1) attached to each basal cell. The cultural and morphological characteristics of C1 (16 isolates) matched the description for Pestalotiopsis mangiferae while B1 (27 isolates) matched the description for P. vismiae (2). The PCR-amplified and sequenced internal transcribed spacer (ITS) region of the ribosomal DNA (ITS1-5.8S-ITS2) for isolate C1 (GenBank Accession No. JQ281542) and B1 (GenBank Accession No. JQ281543) were 99 and 100% homologous to that of the P. mangiferae isolate MM 102 (GenBank Accession No. GU722595) and P. vismiae isolate xsd08116 (GenBank Accession No. FJ481027), respectively. For pathogenicity tests, nine healthy detached leaves and 12 potted plants of M. rubra were wound inoculated with sterile water (control) or conidial suspensions (105 conidia per ml; 20 μl on each site) of C1 and B1, respectively, and maintained with relative humidity of more than 90% under fluorescent light at 28°C. Tests were performed twice. Necrotic lesions, resembling those that occurred in the field, were observed on all inoculated detached leaves and 33.3% of C1 and 25% of B1 inoculated potted plants 10 and 30 days following inoculation, respectively, while the controls remained healthy. Two fungi were reisolated from the lesions with identical morphology to the initial C1 and B1 inoculums. Therefore, P. mangiferae and P. vismiae were determined to be the causal agent for twig dieback of M. rubra in China. Pestalotiopsis spp. were previously reported as pathogens of loquat (4), mango (3), and blueberry (1) causing economic loss. To our knowledge, this is the first report of twig dieback disease of M. rubra caused by P. mangiferae and P. vismiae. References: (1) J. G. Espinoza et al. Plant Dis. 92:1407, 2008. (2) Q. X. Ge et al. Flora Fungorum Sinicorum. Vol. 38, Pestalotiopsis. Science Press, Beijing, 2009. (3). Y. Ko et al. Plant Dis. 91:1684, 2007. (4). A. E. Perelló and S. Larran. Plant Dis. 83:695, 1999.
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Pang P, Chen FY, Tang J, Ma LF, Wang JC, Zheng SJ. Avian leukosis virus p27 inhibits tumor necrosis factor alpha expression in RAW264.7 macrophages after stimulation with lipopolysaccharide. Acta Virol 2010; 54:119-24. [PMID: 20545441 DOI: 10.4149/av_2010_02_119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
UNLABELLED Avian leukosis is a widely distributed disease caused by Avian leukosis virus (ALV). ALV p27 is a capsid protein and group specific antigen, whose role in host immune response is poorly understood. To explore ALV p27, we developed a RAW264.7 macrophage cell line stably expressing p27-GFP fusion protein. The cells of this line and control cell line expressing GFP protein only were compared in production of tumor necrosis factor alpha (TNF-alpha), interleukins IL-1beta, IL-6, IL-12, and in proliferative activity stimulated by the lipopolysaccharide (LPS). It was found that the ALV p27 expression markedly reduced the production of TNF-alpha, but did not affect the production of IL-1beta, IL-6, and 12, and cell proliferative activity. These results demonstrate that ALV p27 specifically inhibits TNF-alpha expression in the macrophages stimulated by LPS, suggesting a possible contribution of ALV p27 to immunosuppression detected in ALV-infected hosts. KEYWORDS Avian leukosis virus; p27; tumor necrosis factor alpha; interleukins; macrophages; lipopolysaccharide.
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Chang RC, Chen FY, Chuang CT, Tung YC. Residual stresses of sputtering titanium thin films at various substrate temperatures. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2010; 10:4562-4567. [PMID: 21128457 DOI: 10.1166/jnn.2010.1696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This work seeks to characterize the residual stresses of titanium thin films as they are affected by various substrate temperatures during the sputtering process. The titanium thin films are deposited on silicon wafers by a RF magnetron sputter while different substrate temperatures are considered. The residual stresses are measured by both X-ray diffraction and a substrate curvature method, and consistent results are obtained by both methods. The results show that the residual stress decreases as the substrate temperature increases, in which the stress changes from tensile to compressive when the substrate temperature increases from 25 to 50 degrees C. Furthermore, the elastic modulus and hardness of the titanium thin films are tested with a nanoindenter using a standard Berkovich probe. Correlations between the residual stresses and mechanical properties measured by nanoindentation are also discussed.
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Wang L, Suo X, Chen FY, Zheng SJ. Expression of Newcastle disease virus (NDV) M protein from a recombinant plasmid prolongs the survival of NDV-infected chicken embryos and enhances the virus replication. Acta Virol 2009; 53:105-10. [PMID: 19537911 DOI: 10.4149/av_2009_02_105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
To explore the role of M protein in the replication of NDV in chicken embryos, the M gene was cloned and inserted into plasmid pcDNA4.0. Western blot analysis showed that the M protein was expressed in DF-1 cells after transfection with M gene plasmid. Chicken embryonated eggs inoculated with the M gene plasmid and 2 days later infected with NDV showed 10 times higher hemagglutination (HA) titers and an increased survival of the embryos as compared with the embryos inoculated with the empty plasmid. These data indicated that the expression of M protein in the NDV-infected chicken embryos primarily prolonged their survival and consequently enhanced virus replication.
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Chen XK, Xiao YY, Zheng WB, Chen FY, Wu RH. Functional magnetic resonance mapping of motor cortex in patients with mass lesions near primary motor and sensory cortices. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2008; 2006:1877-80. [PMID: 17946484 DOI: 10.1109/iembs.2006.260598] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
PURPOSE To study motor cortex mapping in patients with mass lesions near primary motor and sensory cortices with BOLD-fMRI. MATERIAL AND METHODS 18 patients with mass lesions near primary motor and sensory cortices, and 8 healthy volunteers were investigated with fMRI using a 1.5 T GE Signa scanner. The specific task was repetitive selfpaced index finger to thumb opposition with a frequency of approximately 2 Hz. Each task paradigm consisted of twelve 20-second blocks alternating between rest and activation. All functional data was sent to SUN GE Advanced Workstation 4.0 for post processing. RESULTS 14 patients showed functional activation near mass lesion, 4 patients failed to show, and one patient with meningeoma was excluded because of heavy head movement. Of 14 patients, the functional activation of eloquent cortex was different between the group with declination of muscle force and the group with normal muscle force, generally the activated areas of the former were more scattered, dislocated, relative smaller than that of the latter. CONCLUSION fMRI is a valuable method for pre-operative evaluation of neurosurgical patients and probably can evaluate the muscle force pre- and post-operation approximately.
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Li JM, Shen Y, Wu DP, Liang H, Jin J, Chen FY, Song YP, Song EYP, Qiu XF, Hou M, Qiu ZC, Shen ZX. Aclarubicin and low-dose Cytosine arabinoside in combination with granulocyte colony-stimulating factor in treating acute myeloid leukemia patients with relapsed or refractory disease and myelodysplastic syndrome: a multicenter study of 112 Chinese patients. Int J Hematol 2006; 82:48-54. [PMID: 16105759 DOI: 10.1532/ijh97.a10424] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
One hundred twelve patients with geriatric acute myeloid leukemia (AML), refractory or relapsed AML, or myelodysplastic syndrome and refractory anemia with excess of blasts in transformation (MDS-RAEBt) were entered into this study to receive CAG (aclarubicin and low-dose cytosine arabinoside [Ara-C]in combination with granulocyte colony-stimulating factor [G-CSF]) with the objective of evaluating the efficacy and tolerance of this regimen. Low-dose Ara-C was given subcutaneously at a dosage of 10 mg/m2 every 12 hours on days 1 to 14. Aclarubicin was administered intravenously at a dosage of 14 mg/m2 per day on days 1 to 4 (CAG regimen A) or 7 mg/m2 on days 1 to 8 (CAG regimen B). Recombinant G-CSF was given subcutaneously at a dosage of 200 3g/m2 per day on days 1 to 14. We demonstrated comparable overall complete remission rates for the 4 groups of patients: 30.8% (8/26) in the elderly patients, 48.4% (30/62) in the refractory AML patients, 44.4% (8/18) in the relapsed AML patients, and 38.5% (5/13) in the MDS-RAEBt patients. Of the 52 patients followed up, the 12-month progression-free survival (PFS) and overall survival (OS) rates estimated by the Kaplan-Meier method were 40.73% 3 8.15% and 42.85% 3 8.23%, respectively. The median PFS and OS times were 9.0 3 2.2 months and 11.0 3 1.6 months, respectively. Toxic effects were very rare and mainly consisted of neutropenia and thrombocytopenia due to myelosuppression; approximately 70% to 80% of patients had neutropenia or thrombocytopenia that exceeded National Cancer Institute grade II. Nonhematologic toxicities were not observed in this study. The CAG regimen seems promising, with acceptable toxicity, for the treatment of various categories of poor-prognosis AML and MDS-RAEBt.
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Xiao YY, Chen XK, Du L, Pei RQ, Chen FY, Liu GR, Wu RH. The brain mapping on reinforcement acupuncture stimulation at ST36 (zusanli) evidenced by fMRI. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2006; 2006:1036-9. [PMID: 17946439 DOI: 10.1109/iembs.2006.260495] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
To characterize the brain mapping on reinforcement acupuncture stimulation at ST36 (zusanli), and to discuss the mechanisms of acupuncture to treat diseases. fMRI was performed on 26 healthy Chinese student volunteers. Sixteen subjects were acupunctured at the acupoint ST36, while 10 others at sham-acupoint (lateral from ST36 about 3 cm). The fMRI studies were performed using a gradient echo-EPI sequence. Brain mapping were generated using GE Functool program. Cerebral blood flow and correlation coefficient (CC) of ROl were analyzed. Stimulation at the right ST36 elicited 13 brain functional areas, and 10 of these areas were the same with the sham-acupoint group. However, only the temporal gyrus was specificity while by using reinforcement manual acupuncture (MA) at ST36 (Fisher's Exact test, P=0.022), and the contralateral hemisphere activation was prominent (McNemer test, P=0.020). Our results support the theory of acupuncture about meridian distribution overlapping on the whole body. The special transmission channel of meridian may exists, and it may be consist of spinal nerve and autonomic nerve. However, our results may oppose the theory concerning on stomach meridian walking lateral.
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Chen FY, Uang BJ. Enantioselective synthesis of (R)-3-(3,4-dihydroxyphenyl)alanine from tert-butyl glycinate. J Org Chem 2002; 66:3650-2. [PMID: 11348167 DOI: 10.1021/jo015569c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Li YK, Chir J, Chen FY. Catalytic mechanism of a family 3 beta-glucosidase and mutagenesis study on residue Asp-247. Biochem J 2001; 355:835-40. [PMID: 11311148 PMCID: PMC1221801 DOI: 10.1042/bj3550835] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A family 3 beta-glucosidase (EC 3.2.1.21) from Flavobacterium meningosepticum has been cloned and overexpressed. The mechanistic action of the enzyme was probed by NMR spectroscopy and kinetic investigations, including substrate reactivity, secondary kinetic isotope effects and inhibition studies. The stereochemistry of enzymic hydrolysis was identified as occurring with the retention of an anomeric configuration, indicating a double-displacement reaction. Based on the k(cat) values with a series of aryl glucosides, a Bronsted plot with a concave-downward shape was constructed. This biphasic behaviour is consistent with a two-step mechanism involving the formation and breakdown of a glucosyl-enzyme intermediate. The large Bronsted constant (beta=-0.85) for the leaving-group-dependent portion (pK(a) of leaving phenols >7) indicates substantial bond cleavage at the transition state. Secondary deuterium kinetic isotope effects with 2,4-dinitrophenyl beta-D-glucopyanoside, o-nitrophenyl beta-D-glucopyanoside and p-cyanophenyl beta-D-glucopyanoside as substrates were 1.17+/-0.02, 1.19+/-0.02 and 1.04+/-0.02 respectively. These results support an S(N)1-like mechanism for the deglucosylation step and an S(N)2-like mechanism for the glucosylation step. Site-directed mutagenesis was also performed to study essential amino acid residues. The activities (k(cat)/K(m)) of the D247G and D247N mutants were 30000- and 200000-fold lower respectively than that of the wild-type enzyme, whereas the D247E mutant retained 20% of wild-type activity. These results indicate that Asp-247 is an essential amino acid. It is likely that this residue functions as a nucleophile in the reaction. This conclusion is supported by the kinetics of the irreversible inactivation of the wild-type enzyme by conduritol-B-epoxide, compared with the much slower inhibition of the D247E mutant and the lack of irreversible inhibition of the D247G mutant.
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Yuan WJ, Chen FY, Zhang GY. [Effect of indomethacin on natural killer(NK) cell and T lymphocyte subsets from patients with hepatocellular carcinoma]. HUNAN YI KE DA XUE XUE BAO = HUNAN YIKE DAXUE XUEBAO = BULLETIN OF HUNAN MEDICAL UNIVERSITY 2000; 25:583-4. [PMID: 12516414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
Abstract
Twenty-one patients with advanced hepatocellular carcinoma were randomly divided into two groups. They were orally given tegafur 200 mg three times a day with(Group I, n = 11) or without(Group II, n = 10) indomethacin 25 mg three times a day for 7 days. Before and after the therapies the NK cell and T-lymphocyte subset activity in peripheral blood were measured. The results showed that NK cell activity in Group I was significantly higher than that in Group II(P < 0.01) and that before the treatment as well(P < 0.05). T-lymphocyte subsets had no significant difference between the two groups and before or after the therapy. It is suggested that the indomethacin might improve the NK activity of the patients with advanced hepatocellular carcinoma.
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Hung WC, Chen FY, Huang HW. Order-disorder transition in bilayers of diphytanoyl phosphatidylcholine. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1467:198-206. [PMID: 10930522 DOI: 10.1016/s0005-2736(00)00221-2] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A comparative study on bilayers of diphytanoyl phosphatidylcholine (DPhPC) and bilayers of dimyristoyl phosphatidylcholine (DMPC) was made by X-ray lamellar diffraction as a function of temperature and the degree of hydration. An order-disorder phase transition of DPhPC reveals an interesting contrast to the standard model of DMPC. Electron density profiles allow us to deduce the conformational changes which occur in the headgroup-glycerol region and in the chain region. The important conclusion is that the lipid headgroup may have different conformational energetics in lipids of different chains. We explain why this is important to protein-membrane interactions.
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Chen FY, Ho JJ, Fang YK, Shu CY, Hsu CY, Chen JR, Ju MS. Switching transient analysis of a metal/ferroelectric/semiconductor switch diode with high speed response to infrared light. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 1999; 46:502-510. [PMID: 18238450 DOI: 10.1109/58.764835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A thin PbTiO(3)-n-p(+) silicon switch diode has been developed, in which the switching voltage (the turned-on voltage) changes in proportion to the infrared light power. The diode has a rapid response time of 0.65 mus compared with other conventional infrared sensors. It is attributed to the rapid switching device structure and the smaller pyroelectric layer thickness, 50 nm. In this paper, we have analyzed the rapid switching transient response by using heat conduction and switching theory successfully. The experimental results are in agreement with the theoretical analysis.
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