901
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Chen M, Lu W, Chen Q, Ruchala K, Olivera G. ROI Constrained Deformable Image Registration for On-Line Adaptive Radiotherapy. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.2125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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902
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Jin J, Ryu S, Sheim S, Faber K, Chen Q, Ajlouni M, Movsas B. What are the Factors Affecting Patient Positioning Accuracy After Image Fusion Guided Target Localization in Stereotactic Body Radiosurgery? Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.2115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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903
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Bai J, Zhang Y, Lin M, Zeng X, Wang Z, Shen J, Jiang L, Gao F, Chen Q. Interleukin-18 gene polymorphisms and haplotypes in patients with oral lichen planus: a study in an ethnic Chinese cohort. ACTA ACUST UNITED AC 2007; 70:390-7. [PMID: 17854431 DOI: 10.1111/j.1399-0039.2007.00922.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Interleukin (IL)-18, a proinflammatory cytokine, induces T-helper 1 differentiation and cytotoxic T-lymphocyte functions, both of which have been proposed in the pathogenesis of oral lichen planus (OLP) - an oral disease resembles oral mucosal graft-versus-host disease (GVHD) both clinically and histologically. The aim of this study was to evaluate the association of single nucleotide polymorphisms (SNPs) in the IL18 gene on the chromosome 11q22 in patients with OLP. Four SNPs of the IL18 gene at positions -137G/C (rs187238), -607C/A (rs1946518), -656G/T (rs1946519), and 1248A/G (rs189667) were analyzed in 151 patients with OLP and 143 normal controls using polymerase chain reaction-sequence-specific primers method, and the serum level of IL-18 protein was determined by enzyme-linked immunosorbent assay (ELISA). The data revealed that there is a significant difference in IL18-607 genotype distributions between the patient group and the control group (P < 0.001), and the polymorphism -137G/C also appears to be statistically associated with the more severe erosive subtype (eOLP) (P = 0.023). The identified polymorphisms at the IL-18 promoter region (i.e. -137GG) are likely to exert positive effect on the production of IL-18 protein in OLP, as detected by ELISA. Using phase software, four haplotypes were deduced from the two polymorphisms -607C/A and -137G/C, named haplotypes I to IV, and the haplotypes I, II, and IV are significantly associated with OLP (P < 0.001). Our data suggest that the identified IL18 polymorphisms may be associated with the pathogenesis of OLP in this Chinese cohort by upregulation of IL-18 production in vivo.
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904
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Wang L, Chen Q. Theoretical and numerical studies of coupling multizone and CFD models for building air distribution simulations. INDOOR AIR 2007; 17:348-61. [PMID: 17880631 DOI: 10.1111/j.1600-0668.2007.00481.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
UNLABELLED Multizone network models employ several assumptions, such as uniform temperature and pressure and quiescent air inside a zone, which may lead to inaccurate results in flow calculations. These assumptions can be eliminated in the zones, where the assumptions are inappropriate, by coupling a multizone network program with a computational fluid dynamics (CFD) program. Through theoretical analysis, this paper proves that the solution of air distribution by using the coupled program exists and is unique. Three possible coupling methods have been discussed in the paper. The best method is pressure-pressure coupling that exchanges pressure between the multizone and CFD because it is most stable and can always lead to a converged solution. Numerical tests were further performed to verify the theory and it demonstrated that the coupled program is able to effectively improve the accuracy of the results. PRACTICAL IMPLICATIONS The results of this paper provide a theoretical basis for improving the accuracy for modeling airflow and contaminant distributions in buildings. The coupled multizone and computational fluid dynamics can give high fidelity results, so field measurements may not be needed in the future. Designers of indoor environment in the future can use such a tool to evaluate different alternatives in design and identify the best solution for a building that can provide a healthy indoor environment.
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905
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Tang S, Zhou Y, Li R, Chen Q, Xiao X. Pharmacokinetics and lung-targeting characterization of a newly formulated enrofloxacin preparation. J Vet Pharmacol Ther 2007; 30:443-50. [PMID: 17803737 DOI: 10.1111/j.1365-2885.2007.00895.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new lung-targeting and controlled releasing preparation, enrofloxacin microsphere, was formulated and its physical properties, stability, pharmacokinetics and lung-targeting characteristics were tested in this study. The enrofloxacin microsphere prepared was demonstrated round and regular, which was easy to be dispersed and stable in both light stability test and heat stability test. Following intravenous administration of a single dose in dog, the drug concentration-time data in the lung were fitted most suitably with three-compartment open model. Compared with enrofloxacin injection (Baytril, half-life of distribution phase in the lung was shortened from 0.72 to 0.16 h, half-life of elimination phase in the lung was prolonged from 5.15 to 33.86 h and clearance of drug concentration in the lung was decreased from 0.603 to 0.267 L/h/kg. Lung-targeting parameters, including the relative intake rate (Re), targeting efficacy (Te) and the ratio of peak concentration (Ce), were calculated according to the pharmacokinetic parameters. The results showed that Re (2.48) and Ce (4.27) of the lung was much greater than that of other tissues and the ratio of Te(microsphere) to Te(Baytril) increased by a factor of 1.77 (compared with liver) to 3.51 (compared with spleen). Therefore, the enrofloxacin microsphere prepared in this study had controlled releasing and lung-targeting effects in dog.
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906
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Su XX, Liu HY, Qi HW, Yu W, Chen Q. Effect of maize stalk processing methods on
fattening bulls and on diet digestibility. JOURNAL OF ANIMAL AND FEED SCIENCES 2007. [DOI: 10.22358/jafs/74588/2007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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907
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Yu H, Li T, Qiao W, Chen Q, Geng Y. Guanine tetrad and palindromic sequence play critical roles in the RNA dimerization of bovine foamy virus. Arch Virol 2007; 152:2159-67. [PMID: 17712597 DOI: 10.1007/s00705-007-1047-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2006] [Accepted: 07/18/2007] [Indexed: 10/22/2022]
Abstract
Retroviruses are unique in having a diploid genome. However, the RNA sequences and structures that link the two RNA molecules are different. To identify the dimer linkage site of bovine foamy virus (BFV), complementary DNAs were used to interfere with RNA dimerization of BFV. We found that two sites, designated SI and SII, within a 53-base RNA fragment, were essential for BFV dimerization in vitro. SI consists of a potential guanine tetrad (GGGGC), which overlaps the primer binding site, while SII contains 15 nucleotides including a palindromic sequence, UCCCUAGGGA. Masking either of the sites completely abolished RNA dimer formation. Furthermore, a deletion of SII was introduced into a BFV infectious DNA clone; we found that deletion of SII significantly increased expression of BFV transactivator Borf-1. Interestingly, we also found that this deletion abolished viral infectivity. These results suggest that dimerization might play a unique role in the BFV life cycle.
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908
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Shen SC, Ng WK, Chen Q, Zeng XT, Chew MZ, Tan RBH. Solid-phase low temperature steam-assisted synthesis of thermal stable alumina nanowires. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2007; 7:2726-33. [PMID: 17685289 DOI: 10.1166/jnn.2007.619] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A simple steam-assisted solid phase synthesis method was developed for synthesis of boehmite nanowires in the presence of TEAOH surfactant. The boehmite nanowires had uniform diameters (12-16 nm) and length up to 1-2 microm. The morphology of the nanostructured wires was well preserved after being converted to pure gamma-Al2O3 by thermal treatment at 600 degrees C for 5 h. The nanowires of Al2O3 exhibited excellent thermal stability by retarding the phase transformation and maintaining the wires-like nanostructure after being aged up to 1300 degrees C by preventing sintering between particles at high temperatures. The surface areas of Al2O3 nanowires could be maintained as high as 68 m2/g at 1300 degrees C while the surface areas of Al2O3 micropowder shrank to 0.89 m2/g after same thermal treatment. Both in-situ XRD and 27Al NMR results indicated that the crystal structure of gamma-Al2O3 nanowires was not transformed to alpha-Al2O3 at 1300 degrees C whereas micropowder Al2O3 was fully converted to alpha-Al2O3 at 1100 degrees C.
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909
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Chen Q, Li DY, Oiwa K. The coordination of protein motors and the kinetic behavior of microtubule — A computational study. Biophys Chem 2007; 129:60-9. [PMID: 17566632 DOI: 10.1016/j.bpc.2007.05.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2007] [Revised: 05/09/2007] [Accepted: 05/11/2007] [Indexed: 11/20/2022]
Abstract
Utilizing the mechanical energy converted from chemical energy through hydrolysis of ATP, motor proteins drive cytoskeleton filaments to move in various biological systems. Recent technological advance has shown the potential of the motor proteins for powering future nano-bio-mechanical systems. In order to effectively use motor proteins as a biological motor, the interaction between the protein motors and bio-filaments needs to be well clarified, since such interaction is largely influenced by many factors, such as the coordination among the motors, their dynamic behavior, physical properties of microtubules, and the viscosity of solution involved, etc. In this study, a two-dimensional model was proposed to simulate the motion of a microtubule driven by protein motors based on a dissipative particle dynamics (DPD) method with attempt to correlate the microtubule's kinetic behavior to the coordination among protein motors.
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910
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Li C, Zhang J, Huang C, Chen Q, Wang H. Isolation of DNA topoisomerase II gene from Pleurotus ostreatus and its application in phylogenetic analysis. J Appl Microbiol 2007; 103:2026-32. [DOI: 10.1111/j.1365-2672.2007.03446.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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911
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Chen Q, Li X, He W, Zhang H, Gao A, Cheng Y, Lei J, Li S, Zeng L. The epitope study of alpha-fodrin autoantibody in primary Sjögren's syndrome. Clin Exp Immunol 2007; 149:497-503. [PMID: 17614976 PMCID: PMC2219331 DOI: 10.1111/j.1365-2249.2007.03435.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Alpha-fodrin, an intracellular organ-specific cytoskeleton protein, was identified recently as an autoantigen associated with Sicca- and Sjögren's syndrome (SS). Identification of the antigenic determinants of alpha-fodrin is a prerequisite to developing highly sensitive and specific anti-alpha-fodrin antibodies, which provides potential means for the diagnosis of primary Sjögren's syndrome (pSS) in patients. Based on the structure and predicted antigenic sites of alpha-fodrin protein with 560 amino acids (alpha-fodrin 560), we prepared a set of overlapping recombinant protein fragments covering antigenic epitopes and synthesized a set of peptides derived from the alpha-fodrin protein. These recombinant proteins and synthesized peptides were subjected to screening with pSS patients sera, respectively. The peptide with the strongest immunoreactivity was used as antigenic peptide to define further the role of anti-alpha-fodrin-peptide antibodies in the sera of 135 patients with pSS, 48 patients with systemic lupus erythematosus (SLE), 88 patients with rheumatoid arthritis (RA) and 83 normal controls. Our data showed that the N-terminal peptide of amino acids 46-59 (N46) of alpha-fodrin 560 was the epitope with strongest antigenicity. The prevalences of anti-N46 peptide antibodies (alpha-N46PA) in patients with pSS, SLE, RA and normal controls were 78.5%, 10.4%, 21.6% and 6.0%, respectively. The sensitivity and specificity of the autoantibodies in pSS were 78.5% and 86.8%, respectively. These results suggest the alpha-N46PA which shows highest sensitivity and specificity is of significance to develop an effective diagnostic approach for pSS.
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912
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Morel-Kopp M, Chen Q, McLean L, Tennant C, Tofler G, Ward C. THE ASSOCIATION OF DEPRESSION WITH PLATELET ACTIVATION: EVIDENCE FOR A TREATMENT EFFECT. J Thromb Haemost 2007. [DOI: 10.1111/j.1538-7836.2007.tb02930.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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913
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Zhang L, Liu Z, Chen Q, Hansen EW. Quantitative Determination of Phase Content in Multiphase Polymers by Combining Spin-Diffusion and CP-MAS NMR. Macromolecules 2007. [DOI: 10.1021/ma0707786] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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914
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Lin R, Fan N, Guo Z, Wang X, Chen Q, Liu J, Lin J. Results of semimonthly 5-florouracil/leucovorin combined with paclitaxel and oxaliplatin in treatment of advanced gastric cancer (AGC). J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.15045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
15045 Background: At present there is still no standard chemotherapy regimen for AGC, the progress of AGC exhibits a pessimistic result with a median survival of less than 9 months. The purpose of this trial was designed to enhance the treatment efficacy for AGC by using semimonthly FU/LV combined with paclitaxel and oxaliplatin. Methods: Patients chosen with histologically proven diagnosis of adenocarcinoma of the stomach or gastroesophageal junction, locally advanced (i.e., unresectable) or metastatic and measurable disease. The chemotherapy regimen was comprised of a 3-hour infusion of 135 mg/m2 of paclitaxel followed by oxaliplatin 85 mg/m2 and LV 400 mg/m2, administered simultaneously as a 2-hour infusion, then continued a 46-hour infusion of FU 2.4 g/m2 using an ambulatory pump. Treatment was continued until disease progressed, unacceptable toxicity, or patient choice. The primary endpoint was response rate. Results: Twenty-seven patients were enrolled onto this study in our center between September 19, 2005 and December 25, 2006. The median patient age was 51 years (range, 28 to 66 years), 21 were males and 6 were females. All patients received the chemotherapy between at least two cycles and maximum eight cycles with a median of three. Four CRs of 27 enrolled patients, fifteen PRs and eight SDs were observed. Nineteen patients were chemonaive within enrolled patients: Four CRs, eleven PRs. At a median follow-up of 8.7 months, the median survival was 6.8 months. Frequent grade 3 to 4 toxicities were: neutropenia (37.0%), stomatitis (7.4%), nausea (7.4%), vomiting (7.4%), hepatic dysfunction (3.7%), paresthesia (18.5%). No treatment-related death occurred. Conclusion: Semimonthly FU/LV combined with paclitaxel and oxaliplatin appears to be of well efficacy and is well tolerated in patients with AGC. Currently, this regimen is being tested in the phase III trial involving patients with AGC on the basis of well result. No significant financial relationships to disclose.
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915
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Wang RH, Chen Q, Chen FR, Kai JJ, Peng LM. Quantitative analysis of defects and domain boundaries in mesoporous SBA-16 films. Micron 2007; 38:362-70. [PMID: 16919963 DOI: 10.1016/j.micron.2006.06.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Some quantitative structural analyses on defects and domain boundaries observed in SBA-16 films were performed using the lattice concept and geometric phase method. These analyses show that there exist low angle, high angle and translational anti-phase domain boundaries in SBA-16 films. While some of the domain boundaries bear analogue to those found in normal solid crystals, others are similar to that found in the liquid crystals. In particular near Sigma11 and Sigma13b high angle boundaries were observed. On the one hand the Sigma11 boundaries were found to exist with or without steps (ledge) associated with them depending on whether or not the boundary plane is parallel to the densely packed lattice plane. On the other hand segments of the boundary plane in the Sigma13b boundary were found being always associated with densely packed lattice plane, with the {011} type of lattice plane in one domain being parallel to the {112} type of plane in the other domain. The translational domain boundary was observed to have a translation vector having a projected component of (1/2) <110> on the (111) plane. The bending deformation similar to that found in the nematics liquid crystal was also observed and quantitatively analyzed using the geometric phase method, and rotational field associated with the deformation was identified.
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916
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Chen Q, Lu W, Chen M, Ruchala K, Olivera G. SU-FF-J-69: A Unified Framework for Planning Uncertainty and Delivery Uncertainty in Inverse Planning. Med Phys 2007. [DOI: 10.1118/1.2760574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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917
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Kumar S, Ryu S, Chen Q, Sheim S, Movsas B, Li S, Jin J. SU-FF-T-322: On Optimization of Treatment Planning for Intensity Modulated Spinal Radiosurgery. Med Phys 2007. [DOI: 10.1118/1.2760985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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918
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Chen M, Lu W, Chen Q, Ruchala K, Olivera G. SU-FF-J-20: A Decision Strategy for Re-Optimization in Adaptive Radiotherapy. Med Phys 2007. [DOI: 10.1118/1.2760525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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919
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Li S, Jiang Q, Athiraman H, Jin J, Chen Q, Ryu S. TH-D-AUD-02: Feasibility of Using High-Field MRI, Functional Imaging, And Diffusion Tensor Images for Treatment Planning of SRS and IMRT. Med Phys 2007. [DOI: 10.1118/1.2761721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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920
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Lu W, Chen M, Chen Q, Ruchala K, Olivera G. TH-C-M100J-02: Real Time Motion Adaptive Delivery-I. Topotherapy. Med Phys 2007. [DOI: 10.1118/1.2761650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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921
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Chen Q, Jin J, Guan H, Hammoud R, Sheim S, Li S, Ryu S, Movsas B. SU-FF-T-391: Study of Treatment Couch Leveling and Sagging Related to Patient Weight and Couch Longitudinal Positions. Med Phys 2007. [DOI: 10.1118/1.2761116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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922
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Guan H, Ajlouni M, Chen Q, Hammoud R, Li S, Jin J, Movsas B. SU-FF-J-125: Fractionated Stereotactic Body Radiation Therapy (SBRT) of Lung Tumors - 4DCT Simulation with An AcQSim CT and Varian's RPM System. Med Phys 2007. [DOI: 10.1118/1.2760630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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923
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Chen Q, Lu W, Chen M, Ruchala K, Olivera G. MO-D-L100J-05: A Semi-Manual Contouring Method in TCS Views. Med Phys 2007. [DOI: 10.1118/1.2761215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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924
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Hammoud R, Guan H, Chen Q, Nurushev T, Pradhan D, Movsas B. SU-FF-T-364: Quality Assurance (QA) Procedure for KV-KV Setup Correction Verification Using Autodetection of Radiopaque Markers. Med Phys 2007. [DOI: 10.1118/1.2761089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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925
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Chen M, Lu W, Chen Q, Ruchala K, Olivera G. MO-E-AUD-06: Ultra-Fast Gamma Index Calculation for Quality Assurance and Optimization in Radiotherapy. Med Phys 2007. [DOI: 10.1118/1.2761292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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