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Chiang CC, Lee HC, Lin SC, Qu D, Chu MW, Chen CD, Chien CL, Huang SY. Unequivocal Identification of Spin-Triplet and Spin-Singlet Superconductors with Upper Critical Field and Flux Quantization. Phys Rev Lett 2023; 131:236003. [PMID: 38134800 DOI: 10.1103/physrevlett.131.236003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 11/13/2023] [Indexed: 12/24/2023]
Abstract
Spin-triplet superconductors play central roles in Majorana physics and quantum computing but are difficult to identify. We show the methods of kink-point upper critical field and flux quantization in superconducting rings can unequivocally identify spin-singlet, spin-triplet in centrosymmetric superconductors, and singlet-triplet admixture in noncentrosymmetric superconductors, as realized in γ-BiPd, β-Bi_{2}Pd, and α-BiPd, respectively. Our findings are essential for identifying triplet superconductors and exploring their quantum properties.
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Affiliation(s)
- C C Chiang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Willian H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - H C Lee
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - S C Lin
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
| | - D Qu
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
- Center of Atomic Initiatives for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - M W Chu
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
- Center of Atomic Initiatives for New Materials, National Taiwan University, Taipei 10617, Taiwan
| | - C D Chen
- Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
| | - C L Chien
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Willian H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - S Y Huang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Center of Atomic Initiatives for New Materials, National Taiwan University, Taipei 10617, Taiwan
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Wang X, Chen X, Kang X, Zhang R, Qu D, Xue L, Cheng G, Xi G, Zhang T, Deng L, Liu W, Bi N, Li Y. 92P Neoadjuvant multimodality RX including immunotherapy for highly selective unresectable locally advanced esophageal squamous cell carcinoma (NEXUS): A prospective, single-arm, phase II trial. Immuno-Oncology and Technology 2022. [DOI: 10.1016/j.iotech.2022.100196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Yu N, Wan Y, Zuo L, Cao Y, Qu D, Liu W, Deng L, Zhang T, Wang W, Wang J, Feng Q, Zhou Z, Xiao Z, BI N, Niu T, Wang X. MRI and CT Radiomics Features to Predict Overall Survival of Locally Advanced Esophageal Cancer after Definite Chemoradiotherapy. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.1051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Wang FM, Yang CY, Qian Y, Li F, Gu L, Chen DM, Sun Y, Zhu RN, Wang F, Guo Q, Zhou YT, De R, Cao L, Qu D, Zhao LQ. [Clinical characteristics of human adenovirus infection in hospitalized children with acute respiratory infection in Beijing]. Zhonghua Er Ke Za Zhi 2022; 60:30-35. [PMID: 34986620 DOI: 10.3760/cma.j.cn112140-20210809-00658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Objective: To compare the clinical characteristics of different types of human adenovirus (HAdV) infection in hospitalized children with acute respiratory infection in Beijing, and to clarify the clinical necessity of adenovirus typing. Methods: In a cross-sectional study, 9 022 respiratory tract specimens collected from hospitalized children with acute respiratory infection from November 2017 to October 2019 in Affiliated Children's Hospital, Capital Institute of Pediatrics were screened for HAdV by direct immunofluorescence (DFA) and (or) nucleic acid detection. Then the Penton base, Hexon and Fiber gene of HAdV were amplified from HAdV positive specimens to confirm their HAdV types by phylogenetic tree construction. Clinical data such as laboratory results and imaging data were analyzed for children with predominate type HAdV infection using t, U, or χ2 test. Results: There were 392 cases (4.34%) positive for HAdV among 9 022 specimens from hospitalized children with acute respiratory infection. Among those 205 cases who were successfully typed, 131 were male and 74 were female, age of 22.6 (6.7, 52.5) months,102 cases (49.76%) were positive for HAdV-3 and 86 cases (41.95%), HAdV-7, respectively, while 17 cases were confirmed as HAdV-1, 2, 4, 6, 14 or 21. In comparison of clinical characteristics between the predominate HAdV type 7 and 3 infection, significant differences were shown in proportions of children with wheezing (10 cases (11.63%) vs. 25 cases (24.51%)), white blood cell count >15 ×109/L (4 cases (4.65%) vs.14 cases (13.73%)), white blood cell count <5×109/L (26 cases (30.23%) vs.11 cases (10.78%)), procalcitonin level>0.5 mg/L (43 cases (50.00%) vs. 29 cases (28.43%)), multilobar infiltration (45 cases (52.33%) vs.38 cases (37.25%)), pleural effusion (23 cases (26.74%) vs. 10 cases (9.80%)), and severe adenovirus pneumonia (7 cases (8.14%) vs. 2 cases (1.96%)) with χ²=5.11, 4.44, 11.16, 9.19, 4.30, 9.25, 3.91 and P=0.024, 0.035, 0.001, 0.002, 0.038, 0.002, 0.048, respectively, and also in length of hospital stay (11 (8, 15) vs. 7 (5, 13) d, Z=3.73, P<0.001). Conclusions: HAdV-3 and 7 were the predominate types of HAdV infection in hospitalized children with acute respiratory tract infection in Beijing. Compared with HAdV-3 infection, HAdV-7 infection caused more obvious inflammatory reaction, more severe pulmonary symptoms, longer length of hospital stay, suggesting the clinical necessity of further typing of HAdVs.
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Affiliation(s)
- F M Wang
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - C Y Yang
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Y Qian
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - F Li
- Department of ICU, Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - L Gu
- Department of Respiratory Medicine, Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - D M Chen
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Y Sun
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - R N Zhu
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - F Wang
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Q Guo
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Y T Zhou
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - R De
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - L Cao
- Department of Respiratory Medicine, Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - D Qu
- Department of ICU, Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - L Q Zhao
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
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Yang CY, Zhou XH, Qian Y, Li F, Gu L, Chen DM, Sun Y, Zhu RN, Wang F, Guo Q, Zhou YT, De R, Cao L, Qu D, Zhao LQ. [Clinical characteristics of children infected with different subtypes/genotypes of human respiratory syncytial virus in Beijing from 2009 to 2017]. Zhonghua Yi Xue Za Zhi 2021; 101:2867-2872. [PMID: 34587726 DOI: 10.3760/cma.j.cn112137-20210314-00631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the different clinical characteristics of children infected with different subtype/genotype of human respiratory syncytial virus (HRSV) in Beijing. Methods: Respiratory specimens for positive HRSV were randomly collected from children with acute respiratory tract infection (ARTI) in the epidemic season of HRSV from November of each year to January of the next year during 2009 and 2017. G genes of HRSV were amplified and sequenced for subtyping and genotyping by bioinformatics analysis. Clinical data were collected and analyzed. Results: Out of 590 children, 376 (63.7%) with subtype A, and 214 (36.3) with subtype B. The annual dominant subtypes of HRSV from 2009 to 2017 were B-A-A-B-AB-A-A-B-A, respectively, whilst a total of 10 genotypes were detected with 95.8% assigned to genotype ON1 and NA1 of subtype A, and genotype BA9 of subtype B. Children infected with subtype B (96 cases, 44.9%) were more likely aged 0-3 month old than those with subtype A (118 cases, 31.4%) (P=0.001), and more likely to be admitted to Intensive Care Unit(ICU) ((124 cases, 57.9%) than those with subtype A (172 cases, 45.7%)) (P=0.005). Statistical significance were shown among children infected with genotype ON1, NA1 or BA9, in the possibility of infection in children aged 0-3 month (P=0.003), proportion of admission into ICU (P=0.007), length of stay in hospital (P=0.001), and clinical outcome (P=0.001), respectively. Conclusion: Children infected with different subtype or genotype of HRSV have different clinical characteristics, which stresses the important role of the monitoring HRSV subtypes and genotypes among children.
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Affiliation(s)
- C Y Yang
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - X H Zhou
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Y Qian
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - F Li
- Department of Intensive Care Unit Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - L Gu
- Department of Respiratory Diseases Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - D M Chen
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Y Sun
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - R N Zhu
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - F Wang
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Q Guo
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Y T Zhou
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - R De
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - L Cao
- Department of Respiratory Diseases Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - D Qu
- Department of Intensive Care Unit Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - L Q Zhao
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
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Huang T, Chen Y, Zhang J, He R, Qu D, Ye Q, Chen X. Rapid and accurate diagnosis of brain abscess caused by Nocardia asiatica with a combination of Ziehl-Neelsen staining and metagenomics next-generation sequencing. Eur J Neurol 2021; 28:355-357. [PMID: 32920981 DOI: 10.1111/ene.14533] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 08/31/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND PURPOSE Early and accurate diagnosis is vital in cerebral nocardiosis, a very rare and infectious disease associated with a high mortality rate. Herein, we report a case that a patient with brain abscess was swiftly diagnosed and successfully treated. METHODS We report a case of a 61-year-old woman with a brain abscess caused by Nocardia asiatica, diagnosed by a combination of Ziehl-Neelsen staining and metagenomics next-generation sequencing (mNGS). RESULTS A 61-year-old woman with left breast cancer resection, diabetes mellitus and a 7-month discontinuous cough and fever was admitted to our hospital. On the third day of hospitalization, she experienced a sudden loss of consciousness and was diagnosed with a brain abscess and a pathological change in cerebral mass on brain magnetic resonance imaging (MRI). Due to the failure of culturing any microorganisms from the pup, the dissected sample from the patient with Ziehl-Neelsen staining tested positive for acid-fast bacilli and was subjected to mNGS. The pathogen was identified as N. asiatica and the patient was treated accordingly with linezolid and trimethoprim-sulfamethoxazole until complete recovery was confirmed by the follow-up cerebral MRI. CONCLUSIONS This is the first case report of a brain abscess caused by N. asiatica being swiftly diagnosed by a combination of Ziehl-Neelsen staining and mNGS. This rapid diagnosis allowed us to successfully treat this rare infection.
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Affiliation(s)
- T Huang
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Neuroscience, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Y Chen
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Neuroscience, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - J Zhang
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Neuroscience, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - R He
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Neuroscience, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - D Qu
- Department of Clinical Neurosciences, Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Q Ye
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Neuroscience, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - X Chen
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Neuroscience, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
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Chiang CC, Huang SY, Qu D, Wu PH, Chien CL. Absence of Evidence of Electrical Switching of the Antiferromagnetic Néel Vector. Phys Rev Lett 2019; 123:227203. [PMID: 31868421 DOI: 10.1103/physrevlett.123.227203] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 09/16/2019] [Indexed: 06/10/2023]
Abstract
Much theoretical and experimental attention has been focused on the electrical switching of the antiferromagnetic (AFM) Néel vector via spin-orbit torque. Measurements employing multiterminal patterned structures of Pt/AFM show recurring signals of the supposedly planar Hall effect and magnetoresistance, implying AFM switching. We show in this Letter that similar signals have been observed in structures with and without the AFM layer, and of an even larger magnitude using different metals and substrates. These may not be the conclusive evidence of spin-orbit torque switching of AFM, but the thermal artifacts of patterned metal structure on substrate. Large current densities in the metallic devices, beyond the Ohmic regime, can generate unintended anisotropic thermal gradients and voltages. AFM switching requires unequivocal detection of the AFM Néel vector before and after SOT switching.
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Affiliation(s)
- C C Chiang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - S Y Huang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - D Qu
- Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan
| | - P H Wu
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - C L Chien
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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Ji KX, Cui F, Qu D, Sun RY, Sun P, Chen FY, Wang SL, Sun HS. MiR-378 promotes the cell proliferation of non-small cell lung cancer by inhibiting FOXG1. Eur Rev Med Pharmacol Sci 2019; 22:1011-1019. [PMID: 29509249 DOI: 10.26355/eurrev_201802_14383] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To identify the functioning mode of miR-378 on non-small cell lung cancer (NSCLC) and provide therapeutic targets for NSCLC. PATIENTS AND METHODS Expression levels of miR-378 in human NSCLC tissue samples and NSCLC-derived cell lines were measured by using quantitative Real-time polymerase chain reaction (PCR). Cell proliferation capacity was assessed by methyl thiazolyl tetrazolium (MTT) assay and colony formation assay. Cell apoptosis and cell cycle distribution were identified by flow cytometry. Downstream target gene was confirmed by using luciferase and Western blotting assays. RESULTS MiR-378 was significantly elevated in NSCLC tissues when compared with para-carcinoma tissues (n=42). Decreased-miR-378 could attenuate cell proliferation capacity, as well as promoted cell apoptosis and induced cell cycle arrest at G0/G1 phase. FOXG1 was chosen as the target gene of miR-378 by bioinformatics analysis and luciferase reporter assay. Moreover, restoration of miR-378 could impair the tumor suppression role of downregulated-miR-378 on NSCLC growth. CONCLUSIONS Decreased-miR-378 exerted tumor-suppressive effects on NSCLC growth via targeting FOXG1 in vitro, which provided an innovative and candidate target for diagnosis and treatment of NSCLC.
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Affiliation(s)
- K-X Ji
- Department of Medical Oncology, The 2nd Affilliated Hospital of Harbin Medical University, Harbin, China.
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Ke X, Ye J, Pan Z, Geng J, Besser MF, Qu D, Caro A, Marian J, Ott RT, Wang YM, Sansoz F. Ideal maximum strengths and defect-induced softening in nanocrystalline-nanotwinned metals. Nat Mater 2019; 18:1207-1214. [PMID: 31548629 DOI: 10.1038/s41563-019-0484-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 08/15/2019] [Indexed: 06/10/2023]
Abstract
Strengthening of metals through nanoscale grain boundaries and coherent twin boundaries is manifested by a maximum strength-a phenomenon known as Hall-Petch breakdown. Different softening mechanisms are considered to occur for nanocrystalline and nanotwinned materials. Here, we report nanocrystalline-nanotwinned Ag materials that exhibit two strength transitions dissimilar from the above mechanisms. Atomistic simulations show three distinct strength regions as twin spacing decreases, delineated by positive Hall-Petch strengthening to grain-boundary-dictated (near-zero Hall-Petch slope) mechanisms and to softening (negative Hall-Petch slope) induced by twin-boundary defects. An ideal maximum strength is reached for a range of twin spacings below 7 nm. We synthesized nanocrystalline-nanotwinned Ag with hardness 3.05 GPa-42% higher than the current record, by segregating trace concentrations of Cu impurity (<1.0 weight (wt)%). The microalloy retains excellent electrical conductivity and remains stable up to 653 K; 215 K better than for pure nanotwinned Ag. This breaks the existing trade-off between strength and electrical conductivity, and demonstrates the potential for creating interface-dominated materials with unprecedented mechanical and physical properties.
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Affiliation(s)
- Xing Ke
- Materials Science Program, The University of Vermont, Burlington, VT, USA
| | - Jianchao Ye
- Materials Science Division, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - Zhiliang Pan
- Department of Mechanical Engineering, The University of Vermont, Burlington, VT, USA
| | - Jie Geng
- Division of Materials Sciences and Engineering, Ames Laboratory, Ames, IA, USA
| | - Matt F Besser
- Division of Materials Sciences and Engineering, Ames Laboratory, Ames, IA, USA
| | - Dongxia Qu
- Materials Science Division, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - Alfredo Caro
- Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - Jaime Marian
- Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, CA, USA
| | - Ryan T Ott
- Division of Materials Sciences and Engineering, Ames Laboratory, Ames, IA, USA
| | - Y Morris Wang
- Materials Science Division, Lawrence Livermore National Laboratory, Livermore, CA, USA.
| | - Frederic Sansoz
- Materials Science Program, The University of Vermont, Burlington, VT, USA.
- Department of Mechanical Engineering, The University of Vermont, Burlington, VT, USA.
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Zhu J, Yan Y, Wang Y, Qu D. Competitive interaction on dual-species biofilm formation by spoilage bacteria, Shewanella baltica and Pseudomonas fluorescens. J Appl Microbiol 2019; 126:1175-1186. [PMID: 30592126 DOI: 10.1111/jam.14187] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 12/04/2018] [Accepted: 12/20/2018] [Indexed: 12/18/2022]
Abstract
AIMS This study aims to characterize the biofilm produced by mono- and dual-species of Shewanella baltica and Pseudomonas fluorescens as fish spoilers at the different incubation temperature, and to elucidate the interactive behaviour of dual-species biofilm development. METHODS AND RESULTS The mono- and dual-species biofilm formation and adhesion characteristics of S. baltica and P. fluorescens were evaluated by using crystal violet staining, scanning electron microscopy and confocal laser scanning microscopy. Results showed that P. fluorescens had significantly higher biofilm biomass and polysaccharides production than S. baltica, and two isolates reached the maximum biofilm biomass during the early stationary phase. Lower biomass and polysaccharides in dual-species biofilms were observed compared to mono-species of P. fluorescens. Meanwhile, S. baltica and P. fluorescens formed fragile and viscous pellicles with different spatial architectures respectively. In dual-species pellicle few large microcolonies were dominated by P. fluorescens. Compared to mono-species of PF07, adherent cell population and biofilm thickness at the developing phase significantly decreased, and biofilm-forming cycle prolonged in the dual-species biofilms. Biofilm formation and adhesion of mono- and dual-species at 4 or 15°C were significantly higher than at 30°C during the same phase. The culture supernatant extracts of the two spoilage strains greatly inhibited biofilm development to each other. CONCLUSIONS Shewanella baltica and P. fluorescens had different biofilm and pellicle characteristics, and the inhibitory development on dual-species biofilm was associated with the competitive interaction by the two psychrotrophic spoilage bacteria. SIGNIFICANCE AND IMPACT OF THE STUDY This work contributes to a better understanding of interactive behaviour of multispecies biofilm communities by psychrotrophic spoilage bacteria at low temperature, which could contribute to further control contamination of spoilage organism during the preservation and processing of aquatic products.
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Affiliation(s)
- J Zhu
- College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang Province, China
| | - Y Yan
- College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang Province, China
| | - Y Wang
- College of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, Zhejiang Province, China
| | - D Qu
- Department of Medical Microbiology and Parasitology, Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, School of Basic Medical Sciences, Fudan University, Shanghai, China
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Ge Y, Weygant N, Qu D, Houchen C. DCLK1 as part of EMT feedback-loop promotes colorectal cancer cell proliferation, invasion, and 5-Fu resistance. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy431.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Vaßen R, Rauwald KH, Guillon O, Aktaa J, Weber T, Back H, Qu D, Gibmeier J. Vacuum plasma spraying of functionally graded tungsten/EUROFER97 coatings for fusion applications. Fusion Engineering and Design 2018. [DOI: 10.1016/j.fusengdes.2018.06.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Fang J, Wu Y, Qu D, Ma B, Yu X, Zhang M, Han J. Propidium monoazide real-time loop-mediated isothermal amplification for specific visualization of viable Salmonella
in food. Lett Appl Microbiol 2018; 67:79-88. [DOI: 10.1111/lam.12992] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 03/25/2018] [Accepted: 04/06/2018] [Indexed: 01/07/2023]
Affiliation(s)
- J. Fang
- Food Safety Key Laboratory of Zhejiang Province; School of Food Science and Biotechnology; Zhejiang Gongshang University; Hangzhou China
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine; College of Life Science; China Jiliang University; Hangzhou China
| | - Y. Wu
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine; College of Life Science; China Jiliang University; Hangzhou China
| | - D. Qu
- Food Safety Key Laboratory of Zhejiang Province; School of Food Science and Biotechnology; Zhejiang Gongshang University; Hangzhou China
| | - B. Ma
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine; College of Life Science; China Jiliang University; Hangzhou China
| | - X. Yu
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine; College of Life Science; China Jiliang University; Hangzhou China
| | - M. Zhang
- Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine; College of Life Science; China Jiliang University; Hangzhou China
| | - J. Han
- Food Safety Key Laboratory of Zhejiang Province; School of Food Science and Biotechnology; Zhejiang Gongshang University; Hangzhou China
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Qu D, Yan A, Zhang JS. SAR and QSAR study on the bioactivities of human epidermal growth factor receptor-2 (HER2) inhibitors. SAR QSAR Environ Res 2017; 28:111-132. [PMID: 28235391 DOI: 10.1080/1062936x.2017.1284898] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Accepted: 01/16/2017] [Indexed: 06/06/2023]
Abstract
In this paper, structure-activity relationship (SAR, classification) and quantitative structure-activity relationship (QSAR) models have been established to predict the bioactivity of human epidermal growth factor receptor-2 (HER2) inhibitors. For the SAR study, we established six SAR (or classification) models to distinguish highly and weakly active HER2 inhibitors. The dataset contained 868 HER2 inhibitors, which was split into a training set including 580 inhibitors and a test set including 288 inhibitors by a Kohonen's self-organizing map (SOM), or a random method. The SAR models were performed using support vector machine (SVM), random forest (RF) and multilayer perceptron (MLP) methods. Among the six models, SVM models obtained superior results compared with other models. The prediction accuracy of the best model (model 1A) was 90.27% and the Matthews correlation coefficient (MCC) was 0.80 on the test set. For the QSAR study, we chose 286 HER2 inhibitors to establish six quantitative prediction models using MLR, SVM and MLP methods. The correlation coefficient (r) of the best model (model 4B) was 0.92 on the test set. The descriptors analysis showed that HAccN, lone pair electronegativity and π electronegativity were closely related to the bioactivity of HER2 inhibitors.
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Affiliation(s)
- D Qu
- a State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing , P.R. China
| | - A Yan
- a State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing , P.R. China
| | - J S Zhang
- b The High School Affiliated to Renmin University of China , Beijing , P.R. China
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Chandrakesan P, Panneerselvam J, Qu D, Weygant N, May R, Bronze MS, Houchen CW. Regulatory Roles of Dclk1 in Epithelial Mesenchymal Transition and Cancer Stem Cells. ACTA ACUST UNITED AC 2016; 7. [PMID: 27335684 PMCID: PMC4913783 DOI: 10.4172/2157-2518.1000257] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The identification of functionally relevant subpopulations of therapy-resistant cancer cells is a challenge. These cells, intrinsically resistant to conventional therapy, can cause recurrence. Evidence has suggested that therapy-resistant cancer cells are likely epithelial–mesenchymal transition (EMT) cells and/or stem-like cells called cancer stem cells (CSCs). EMT, a normal embryological process that converts epithelial cells into mesenchymal cells, is frequently activated during cancer development and progression. CSCs are a small subpopulation of cancer cells within a tumor mass that have the ability to self-renew and maintain tumor-initiating capacity by giving rise to heterogeneous lineages of cancer cells that comprise the whole tumor. Although the origin of CSCs and EMT cells remains to be fully explored, a growing body of evidence has indicated that the biology of EMT and CSCs is strongly linked. Doublecortin-like kinase 1 (DCLK1), a cancer stem cell marker, is functionally involved in maintaining cancer stemness and the process of EMT important for cancer initiation, cancer metastasis, and secondary tumor formation. Therefore, targeting these cells may provide new strategies to overcome tumor heterogeneity, therapeutic resistance, and cancer relapse. In this review, we will provide a potential mechanistic link between EMT induction and the emergence of CSCs for the origin and progression of cancer. We will highlight the functional activity of DCLK1 in supporting EMT and cancer cell self-renewal, which will lead us to a better understanding of DCLK1 expression in cancer development and progression, and help us to develop targeted therapies for effective cancer treatment.
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Affiliation(s)
- P Chandrakesan
- Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; Stephenson Oklahoma Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; Department of Veterans Affairs Medical Center, Oklahoma City, OK 73104, USA
| | - J Panneerselvam
- Stephenson Oklahoma Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - D Qu
- Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; Stephenson Oklahoma Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - N Weygant
- Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - R May
- Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - M S Bronze
- Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - C W Houchen
- Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; Stephenson Oklahoma Cancer Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; Department of Veterans Affairs Medical Center, Oklahoma City, OK 73104, USA; COARE Biotechnology, Oklahoma City, OK, USA
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17
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Qian SS, Qu D, Chen XF, You ZL, Zhu HL. Syntheses, characterization and crystal structures of [Ni(La)2] and [Zn(Lb)(N3)(Amp)]. RUSS J COORD CHEM+ 2016. [DOI: 10.1134/s1070328416010036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Qu D, Zhang C, Liu Y, Wang L, Wang J, Xiong Y, Gao D. Glial cell line-derived neurotrophic factor promotes β-catenin phosphorylation and nuclear translocation in glioma cells. J Neurosurg Sci 2015; 59:429-435. [PMID: 25423132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
AIM Glial cell line-derived neurotrophic factor (GDNF) and N-cadherin interact to transduce intracellular signals. However, the specific molecular mechanisms of this interaction are unclear. This study attempted to detect changes in GDNF-induced β-catenin phosphorylation and nuclear translocation in C6 glioma cells. METHODS C6 glioma cells were treated with GDNF (70 ng/mL) and membrane and cytoplasmic proteins were extracted. A N-cadherin antibody was used for co-immunoprecipitation (co-IP). Western blot analysis using the co-IP protein was completed using antibodies for β-catenin, Src and β-actin. Immunocytochemistry was conducted with the same antibodies. To determine if Src induced phosphorylation of β-catenin Tyr-654, Western blot analysis was also performed on nuclear proteins from C6 cells treated with tyrosine kinase inhibitor PP2 using then p- β-catenin antibody. RESULTS After induced by GDNF, C6 cell membrane β-catenin was phosphorylated at Tyr-654 and subsequently separated from the N-cadherin/β-catenin complex. Further study confirmed that the induction by GDNF significantly increased cytoplasmic and nuclear expression of phospho-β-catenin (Tyr-654) in C6 glioma cells. There was also an increase in the binding of non-receptor protein kinase Src with N-cadherin on the inner cell membrane surface. Src induced phosphorylation of β-catenin Tyr-654 induced by GDNF decreased significantly. CONCLUSION The results of our study demonstrate that GDNF increases the intracellular phosphorylation level of β-catenin through N-cadherin/Src signaling, which subsequently stimulates the nuclear translocation of β-catenin. This study provides a theoretical basis for us to reveal the role of biological mechanisms on glioma cell by GDNF.
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Affiliation(s)
- D Qu
- Department of Neurosurgery, Nanjing General Hospital of Nanjing Military Command, Nanjing, Jiangsu, PR China -
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Qu D, Zhang Z, Yu X, Zhao J, Qiu F, Huang J. Psychotropic drugs for the management of cancer-related fatigue: a systematic review and meta-analysis. Eur J Cancer Care (Engl) 2015; 25:970-979. [PMID: 26490083 DOI: 10.1111/ecc.12397] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/16/2015] [Indexed: 12/24/2022]
Abstract
Cancer-related fatigue (CRF) is a common symptom affecting 60-90% of cancer survivors, and effective management for CRF is not yet available. Recently, an increasing number of trials examining the use of psychotropic drugs for the treatment of CRF have been performed, but these trials have yielded inconsistent results. Therefore, we conducted a meta-analysis aimed at assessing the effect and safety of psychotropic drugs for the management of CRF. Ten eligible trials of the psychotropic drugs methylphenidate and modafinil in a total of 1582 participants treated for CRF were subjected to statistical analyses. A meta-analysis of seven of these studies indicated that methylphenidate was superior to placebo for the treatment of CRF. Another meta-analysis of three studies evaluating modafinil found that this drug was no better than placebo. Adverse events were similar between both methylphenidate and modafinil and the placebo groups. Our meta-analysis indicated that the treatment of CRF with methylphenidate appears to be effective, whereas modafinil provides no benefit. These results of this analysis warrant further trials to confirm the efficacy and safety of psychotropic drugs for the treatment of CRF.
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Affiliation(s)
- D Qu
- Cancer Institute (Key Laboratory of Cancer Prevention & Intervention National Ministry of Education Provincial Key Laboratory of Molecular Biology in Medical Sciences), The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Community Health Service Center, Hangzhou, China
| | - Z Zhang
- Cancer Institute (Key Laboratory of Cancer Prevention & Intervention National Ministry of Education Provincial Key Laboratory of Molecular Biology in Medical Sciences), The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Gynecology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - X Yu
- Cancer Institute (Key Laboratory of Cancer Prevention & Intervention National Ministry of Education Provincial Key Laboratory of Molecular Biology in Medical Sciences), The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Oncology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - J Zhao
- Cancer Institute (Key Laboratory of Cancer Prevention & Intervention National Ministry of Education Provincial Key Laboratory of Molecular Biology in Medical Sciences), The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Oncology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - F Qiu
- Cancer Institute (Key Laboratory of Cancer Prevention & Intervention National Ministry of Education Provincial Key Laboratory of Molecular Biology in Medical Sciences), The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Oncology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - J Huang
- Cancer Institute (Key Laboratory of Cancer Prevention & Intervention National Ministry of Education Provincial Key Laboratory of Molecular Biology in Medical Sciences), The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China. .,Department of Oncology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
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Ma L, Li X, Zhang J, Shao Y, Nie N, Huang Z, Ge M, Zheng Y, Qu D, Shi J. [Acquired aplastic anemia developing myelodysplastic syndrome/acute myeloid leukemia: clinical analysis of nineteen patients and literatures review]. Zhonghua Xue Ye Xue Za Zhi 2015; 36:216-20. [PMID: 25854465 PMCID: PMC7342519 DOI: 10.3760/cma.j.issn.0253-2727.2015.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To analyze the clinical features of clonal evolution of acquired aplastic anemia (AA) into myelodysplastic syndrome/acute myeloid leukemia (AML) and review of literatures. METHODS AA developing MDS/AML patients between December 1994 and December 2011 enrolled into this study to analyze their clinical characteristics. RESULTS During the median follow-up of 49(15-97) months, 19 patients evolved to MDS/AML, of whom 10, 8 and 1 were from VSAA, SAA and NSAA subgroups, respectively. The median G-CSF therapy was 270(29-510) days. There were monosomy 7 in 11(57.9%) of 19 patients with AA evolved to MDS/AML. The median AA evolved to MDS/AML was 33(11-88) months. The median MDS/AML transformation in responders (54.2 months) was significantly longer than of non-responders (25.7 months, P<0.01). CONCLUSION AA patients could evolved into MDS/AML concomitant with abnormal karotype and worse prognosis.
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Affiliation(s)
- Li Ma
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
| | - Xingxin Li
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
| | - Jing Zhang
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
| | - Yingqi Shao
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
| | - Neng Nie
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
| | - Zhendong Huang
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
| | - Meili Ge
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
| | - Yizhou Zheng
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
| | - Dongxia Qu
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
| | - Jun Shi
- Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300020, China
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Li XP, Xia Q, Qu D, Wu TC, Yang DG, Hao WD, Jiang X, Li XM. The dynamic dielectric at a brain functional site and an EM wave approach to functional brain imaging. Sci Rep 2014; 4:6893. [PMID: 25367217 PMCID: PMC4219156 DOI: 10.1038/srep06893] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 10/15/2014] [Indexed: 11/12/2022] Open
Abstract
Functional brain imaging has tremendous applications. The existing methods for functional brain imaging include functional Magnetic Resonant Imaging (fMRI), scalp electroencephalography (EEG), implanted EEG, magnetoencephalography (MEG) and Positron Emission Tomography (PET), which have been widely and successfully applied to various brain imaging studies. To develop a new method for functional brain imaging, here we show that the dielectric at a brain functional site has a dynamic nature, varying with local neuronal activation as the permittivity of the dielectric varies with the ion concentration of the extracellular fluid surrounding neurons in activation. Therefore, the neuronal activation can be sensed by a radiofrequency (RF) electromagnetic (EM) wave propagating through the site as the phase change of the EM wave varies with the permittivity. Such a dynamic nature of the dielectric at a brain functional site provides the basis for an RF EM wave approach to detecting and imaging neuronal activation at brain functional sites, leading to an RF EM wave approach to functional brain imaging.
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Affiliation(s)
- X P Li
- Neuroengineering Lab, National University of Singapore, 9 Engineering Drive 1, Singapore 117575
| | - Q Xia
- Newrocare Pte Ltd, 6 EU Tong Sen Street, #12-03, The Central, Singapore 059817
| | - D Qu
- Neuroengineering Lab, National University of Singapore, 9 Engineering Drive 1, Singapore 117575
| | - T C Wu
- Neuroengineering Lab, National University of Singapore, 9 Engineering Drive 1, Singapore 117575
| | - D G Yang
- Guilin University of Electronic Technology, No.1 Jinji Road, Guilin 541004, Guangxi, P.R. China
| | - W D Hao
- Guilin University of Electronic Technology, No.1 Jinji Road, Guilin 541004, Guangxi, P.R. China
| | - X Jiang
- Guilin University of Electronic Technology, No.1 Jinji Road, Guilin 541004, Guangxi, P.R. China
| | - X M Li
- Guilin University of Electronic Technology, No.1 Jinji Road, Guilin 541004, Guangxi, P.R. China
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Abstract
A new type of magnetoresistance (MR) observed in Pt/YIG when nominally nonmagnetic Pt comes in contact with a ferrimagnetic insulator yttrium iron garnet (YIG) has drawn intense experimental and theoretical interest. In this Letter, we experimentally demonstrate two physical origins of the new MR: a spin current across the Pt/YIG interface and the magnetic proximity effect. The new MR can also be reproduced when Pt is in contact with a nonmagnetic insulator doped with a few percent of Fe impurities. By tuning the YIG surface and inserting an Au layer between the Pt and YIG, we are able to separate the two contributions.
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Affiliation(s)
- B F Miao
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA and National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China
| | - S Y Huang
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - D Qu
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - C L Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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Yan F, Qu D, Zhao YY, Hu XH, Zhao ZY, Zhang Y, Zou ZR. Effects of exogenous 5-aminolevulinic acid on PIP1 and NIP aquaporin gene expression in seedlings of cucumber cultivars subjected to salinity stress. Genet Mol Res 2014; 13:2563-73. [PMID: 24535911 DOI: 10.4238/2014.january.22.12] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Aquaporins play a direct role in plant water relation under salt stress, but the effects of 5-aminolevulinic acid (ALA) on aquaporin gene expression in salt-treated plants remain unknown. This study investigated the potential effects of exogenous ALA (50 mg/dm3) on aquaporin expression levels under salt stress (75 mM NaCl) in the salt-sensitive (Jinchun No.4) and the relatively salt-tolerant cucumber (Jinyou No.1) seedlings. The expressions of cucumber PIP aquaporin gene (CsPIP1:1) and cucumber NIP aquaporin gene (CsNIP) were analyzed in 20-day-old seedling leaves at 2, 4, 8, 16, and 24 h after ALA treatment. After treatment with saline alone and ALA alone, CsPIP1:1 and CsNIP gene expression levels in the 2 cucumber cultivars increased to maximum at 2 h. The aquaporin gene expression in salt-treated cucumber seedling leaves was considerably higher than that in leaves subjected to exogenous ALA. Further, the aquaporin expression levels in Jinchun No.4 were higher than those in Jinyou No.1, reaching 5.20- and 2-fold induction levels, respectively. After treatment with both ALA and NaCl, the CsNIP gene expression was downregulated in both the cucumber cultivars, while that of CsPIP1:1 decreased at 2 h and then increased to 3.8-fold in Jinchun No.4. In Jinyou No.1, CsPIP1:1 gene expression gradually increased to 2.3-fold at 4 h, followed by a decline in expression. The results indicated that ALA might delay and counteract the upregulated expression of CsPIP1:1 and CsNIP genes in cucumber seedlings under NaCl stress. Thus, salt tolerance of cucumber seedlings might be enhanced by ALA application.
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Affiliation(s)
- F Yan
- College of Horticulture, Northwest Agricultural & Forest University, Yangling, Shaanxi, China
| | - D Qu
- College of Horticulture, Northwest Agricultural & Forest University, Yangling, Shaanxi, China
| | - Y Y Zhao
- College of Horticulture, Northwest Agricultural & Forest University, Yangling, Shaanxi, China
| | - X H Hu
- College of Horticulture, Northwest Agricultural & Forest University, Yangling, Shaanxi, China
| | - Z Y Zhao
- College of Horticulture, Northwest Agricultural & Forest University, Yangling, Shaanxi, China
| | - Y Zhang
- College of Horticulture, Northwest Agricultural & Forest University, Yangling, Shaanxi, China
| | - Z R Zou
- College of Horticulture, Northwest Agricultural & Forest University, Yangling, Shaanxi, China
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Uosaki K, Fukumitsu H, Masuda T, Qu D. Construction of a metal–organic monolayer–semiconductor junction on a hydrogen-terminated Si(111) surface via Si–C covalent linkage and its electrical properties. Phys Chem Chem Phys 2014; 16:9960-5. [DOI: 10.1039/c3cp54619e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Agarwal M, Nitta R, Dovat S, Li G, Arita H, Narita Y, Fukushima S, Tateishi K, Matsushita Y, Yoshida A, Miyakita Y, Ohno M, Collins VP, Kawahara N, Shibui S, Ichimura K, Kahn SA, Gholamin S, Junier MP, Chneiweiss H, Weissman I, Mitra S, Cheshier S, Avril T, Hamlat A, Le Reste PJ, Mosser J, Quillien V, Carrato C, Munoz-Marmol A, Serrano L, Pijuan L, Hostalot C, Villa SL, Ariza A, Etxaniz O, Balana C, Benveniste ET, Zheng Y, McFarland B, Drygin D, Bellis S, Bredel M, Lotsch D, Engelmaier C, Allerstorfer S, Grusch M, Pichler J, Weis S, Hainfellner J, Marosi C, Spiegl-Kreinecker S, Berger W, Bronisz A, Nowicki MO, Wang Y, Ansari K, Chiocca EA, Godlewski J, Brown K, Kwatra M, Brown K, Kwatra M, Bui T, Nitta R, Li G, Zhu S, Kozono D, Li J, Kushwaha D, Carter B, Chen C, Schulte J, Srikanth M, Das S, Zhang J, Lathia J, Yin L, Rich J, Olson E, Kessler J, Chenn A, Cherry A, Haas B, Lin YH, Ong SE, Stella N, Cifarelli CP, Griffin RJ, Cong D, Zhu W, Shi Y, Clark P, Kuo J, Hu S, Sun D, Bookland M, Darbinian N, Dey A, Robitaille M, Remke M, Faury D, Maier C, Malhotra A, Jabado N, Taylor M, Angers S, Kenney A, Ren X, Zhou H, Schur M, Baweja A, Singh M, Erdreich-Epstein A, Fu J, Koul D, Yao J, Saito N, Zheng S, Verhaak R, Lu Z, Yung WKA, Gomez G, Volinia S, Croce C, Brennan C, Cavenee W, Furnari F, Lopez SG, Qu D, Petritsch C, Gonzalez-Huarriz M, Aldave G, Ravi D, Rubio A, Diez-Valle R, Marigil M, Jauregi P, Vera B, Rocha AADL, Tejada-Solis S, Alonso MM, Gopal U, Isaacs J, Gruber-Olipitz M, Dabral S, Ramkissoon S, Kung A, Pak E, Chung J, Theisen M, Sun Y, Monrose V, Franchetti Y, Sun Y, Shulman D, Redjal N, Tabak B, Beroukhim R, Zhao J, Buonamici S, Ligon K, Kelleher J, Segal R, Haas B, Canton D, Diaz P, Scott J, Stella N, Hara K, Kageji T, Mizobuchi Y, Kitazato K, Okazaki T, Fujihara T, Nakajima K, Mure H, Kuwayama K, Hara T, Nagahiro S, Hill L, Botfield H, Hossain-Ibrahim K, Logan A, Cruickshank G, Liu Y, Gilbert M, Kyprianou N, Rangnekar V, Horbinski C, Hu Y, Vo C, Li Z, Ke C, Ru N, Hess KR, Linskey ME, Zhou YAH, Hu F, Vinnakota K, Wolf S, Kettenmann H, Jackson PJ, Larson JD, Beckmann DA, Moriarity BS, Largaespada DA, Jalali S, Agnihotri S, Singh S, Burrell K, Croul S, Zadeh G, Kang SH, Yu MO, Song NH, Park KJ, Chi SG, Chung YG, Kim SK, Kim JW, Kim JY, Kim JE, Choi SH, Kim TM, Lee SH, Kim SK, Park SH, Kim IH, Park CK, Jung HW, Koldobskiy M, Ahmed I, Ho G, Snowman A, Raabe E, Eberhart C, Snyder S, Agnihotri S, Gugel I, Remke M, Bornemann A, Pantazis G, Mack S, Shih D, Sabha N, Taylor M, Tatagiba M, Zadeh G, Krischek B, Schulte A, Liffers K, Kathagen A, Riethdorf S, Westphal M, Lamszus K, Lee JS, Xiao J, Patel P, Schade J, Wang J, Deneen B, Erdreich-Epstein A, Song HR, Leiss L, Gjerde C, Saed H, Rahman A, Lellahi M, Enger PO, Leung R, Gil O, Lei L, Canoll P, Sun S, Lee D, Ho ASW, Pu JKS, Zhang XQ, Lee NP, Dat PJR, Leung GKK, Loetsch D, Steiner E, Holzmann K, Spiegl-Kreinecker S, Pirker C, Hlavaty J, Petznek H, Hegedus B, Garay T, Mohr T, Sommergruber W, Grusch M, Berger W, Lukiw WJ, Jones BM, Zhao Y, Bhattacharjee S, Culicchia F, Magnus N, Garnier D, Meehan B, McGraw S, Hashemi M, Lee TH, Milsom C, Gerges N, Jabado N, Trasler J, Pawlinski R, Mackman N, Rak J, Maherally Z, Thorne A, An Q, Barbu E, Fillmore H, Pilkington G, Maherally Z, Tan SL, Tan S, An Q, Fillmore H, Pilkington G, Malhotra A, Choi S, Potts C, Ford DA, Nahle Z, Kenney AM, Matlaf L, Khan S, Zider A, Singer E, Cobbs C, Soroceanu L, McFarland BC, Hong SW, Rajbhandari R, Twitty GB, Gray GK, Yu H, Benveniste EN, Nozell SE, Minata M, Kim S, Mao P, Kaushal J, Nakano I, Mizowaki T, Sasayama T, Tanaka K, Mizukawa K, Nishihara M, Nakamizo S, Tanaka H, Kohta M, Hosoda K, Kohmura E, Moeckel S, Meyer K, Leukel P, Bogdahn U, Riehmenschneider MJ, Bosserhoff AK, Spang R, Hau P, Mukasa A, Watanabe A, Ogiwara H, Saito N, Aburatani H, Mukherjee J, Obha S, See W, Pieper R, Nakajima K, Hara K, Kageji T, Mizobuchi Y, Kitazato K, Fujihara T, Otsuka R, Kung D, Nagahiro S, Rajbhandari R, Sinha T, Meares G, Benveniste EN, Nozell S, Ott M, Litzenburger U, Rauschenbach K, Bunse L, Pusch S, Ochs K, Sahm F, Opitz C, von Deimling A, Wick W, Platten M, Peruzzi P, Chiocca EA, Godlewski J, Read R, Fenton T, Gomez G, Wykosky J, Vandenberg S, Babic I, Iwanami A, Yang H, Cavenee W, Mischel P, Furnari F, Thomas J, Ronellenfitsch MW, Thiepold AL, Harter PN, Mittelbronn M, Steinbach JP, Rybakova Y, Kalen A, Sarsour E, Goswami P, Silber J, Harinath G, Aldaz B, Fabius AWM, Turcan S, Chan TA, Huse JT, Sonabend AM, Bansal M, Guarnieri P, Lei L, Soderquist C, Leung R, Yun J, Kennedy B, Sisti J, Bruce S, Bruce R, Shakya R, Ludwig T, Rosenfeld S, Sims PA, Bruce JN, Califano A, Canoll P, Stockhausen MT, Kristoffersen K, Olsen LS, Poulsen HS, Stringer B, Day B, Barry G, Piper M, Jamieson P, Ensbey K, Bruce Z, Richards L, Boyd A, Sufit A, Burleson T, Le JP, Keating AK, Sundstrom T, Varughese JK, Harter P, Prestegarden L, Petersen K, Azuaje F, Tepper C, Ingham E, Even L, Johnson S, Skaftnesmo KO, Lund-Johansen M, Bjerkvig R, Ferrara K, Thorsen F, Takeshima H, Yamashita S, Yokogami K, Mizuguchi S, Nakamura H, Kuratsu J, Fukushima T, Morishita K, Tanaka H, Sasayama T, Tanaka K, Nakamizo S, Mizukawa K, Kohmura E, Tang Y, Vaka D, Chen S, Ponnuswami A, Cho YJ, Monje M, Tateishi K, Narita Y, Nakamura T, Cahill D, Kawahara N, Ichimura K, Tiemann K, Hedman H, Niclou SP, Timmer M, Tjiong R, Rohn G, Goldbrunner R, Timmer M, Tjiong R, Stavrinou P, Rohn G, Perrech M, Goldbrunner R, Tokita M, Mikheev S, Sellers D, Mikheev A, Kosai Y, Rostomily R, Tritschler I, Seystahl K, Schroeder JJ, Weller M, Wade A, Robinson AE, Phillips JJ, Gong Y, Ma Y, Cheng Z, Thompson R, Wang J, Fan QW, Cheng C, Gustafson W, Charron E, Zipper P, Wong R, Chen J, Lau J, Knobbe-Thosen C, Weller M, Jura N, Reifenberger G, Shokat K, Weiss W, Wu S, Fu J, Zheng S, Koul D, Yung WKA, Wykosky J, Hu J, Taylor T, Villa GR, Gomez G, Mischel PS, Gonias SL, Cavenee W, Furnari F, Yamashita D, Kondo T, Takahashi H, Inoue A, Kohno S, Harada H, Ohue S, Ohnishi T, Li P, Ng J, Yuelling L, Du F, Curran T, Yang ZJ, Zhu D, Castellino RC, Van Meir EG, Zhu W, Begum G, Wang Q, Clark P, Yang SS, Lin SH, Kahle K, Kuo J, Sun D. CELL BIOLOGY AND SIGNALING. Neuro Oncol 2013. [DOI: 10.1093/neuonc/not174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Abstract
The inverse spin Hall effect (ISHE) has been observed only in nonmagnetic metals, such as Pt and Au, with a strong spin-orbit coupling. We report the observation of ISHE in a ferromagnetic permalloy (Py) on ferromagnetic insulator yttrium iron garnet (YIG). Through controlling the spin current injection by altering the Py-YIG interface, we have isolated the spin current contribution and demonstrated the ISHE in a ferromagnetic metal, the reciprocal phenomenon of the anomalous Hall effect. A large spin Hall angle in Py, determined from Py thin films of different thicknesses, indicates many other ferromagnetic metals may be exploited as superior pure spin current detectors and for applications in spin current.
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Affiliation(s)
- B F Miao
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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27
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Abstract
The acute magnetic proximity effects in Pt/YIG compromise the suitability of Pt as a spin current detector. We show that Au/YIG, with no anomalous Hall effect and a negligible magnetoresistance, allows the measurements of the intrinsic spin Seebeck effect with a magnitude much smaller than that in Pt/YIG. The experiment results are consistent with the spin polarized density functional calculations for Pt with a sizable and Au with a negligible magnetic moment near the interface with YIG.
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Affiliation(s)
- D Qu
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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Huang SY, Fan X, Qu D, Chen YP, Wang WG, Wu J, Chen TY, Xiao JQ, Chien CL. Transport magnetic proximity effects in platinum. Phys Rev Lett 2012; 109:107204. [PMID: 23005323 DOI: 10.1103/physrevlett.109.107204] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Indexed: 06/01/2023]
Abstract
Platinum (Pt) metal, being nonmagnetic and with a strong spin-orbit coupling interaction, has been central in detecting the pure spin current and establishing most of the recent spin-based phenomena. Magnetotransport measurements, both electrical and thermal, conclusively show strong ferromagnetic characteristics in thin Pt films on the ferromagnetic insulator due to the magnetic proximity effects. The pure spin current phenomena measured by Pt, including the inverse spin Hall and the spin Seebeck effects, are thus contaminated and not exclusively established.
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Affiliation(s)
- S Y Huang
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
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29
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Qu D, Song Y, Li WM, Pei XW, Wang ZX, Jia SR, Zhang YQ. Isolation and characterization of the organ-specific and light-inducible promoter of the gene encoding rubisco activase in potato (Solanum tuberosum). Genet Mol Res 2011; 10:621-31. [PMID: 21491372 DOI: 10.4238/vol10-2gmr1088] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Constitutive promoters have been widely used in crop biotechnology applications. Tissue-specific or inducible promoters, however, have advantages in some cases. We isolated the 731-bp 5' flanking sequence of a potato (Solanum tuberosum) gene, encoding ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) activase (RCA), which was isolated by genome walking. By using GUS as a reporter and with Northern blot analysis, the 702-bp fragment (referred to as StRCAp), ranging from nt -731 to -30 relative to the initiation code of the RCA gene, was analyzed in transgenic tobacco plants. The activity of StRCAp in leaves was 0.4-fold less than that of cauliflower mosaic virus 35S promoter, and was expressed throughout the green part of the light-grown transgenic T(1) seedlings, including cytoledons, leaves and young stems, but not roots. Further deletion analysis revealed that a shorter fragment (nt -249 to -30, StRCAp2) retained light-inducible features in cytoledons and leaves, but showed no detectable activity in young stems and roots. Although the activity of StRCAp2 in leaves was reduced significantly compared with that of StRCAp, the overall data indicated that cis-elements sufficient to regulate organ-specific and light-inducible transcription are within the 220-bp fragment. There is potential for application of StRCAp in plant genetic engineering.
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Affiliation(s)
- D Qu
- Biotechnology Research Institute, National Key Facility for Gene Resources and Gene Improvement, Chinese Academy of Agricultural Sciences, Beijing, PR China
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30
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Abstract
The electrical properties of single crystals of p-type Bi(2)Te(3) are shown to be tuned by annealing as-grown crystals in elemental Te vapor at temperatures in the range of 400-420 °C. While as-grown nominally stoichiometric Bi(2)Te(3) has p-type conductivity below room temperature, Te vapor annealed Bi(2)Te(3) shows a cross over from p- to n-type behavior. The temperature dependent resistivity of the Te annealed crystals shows a characteristic broad peak near 100 K. Applied magnetic fields give rise to a large low temperature magnetothermoelectric effect in the Te annealed samples and enhance the low temperature peak in the resistivity. Further, Te annealed Bi(2)Te(3) shows a large positive magnetoresistance, ∼ 200% at 2 K, and ∼ 15% at room temperature. The annealing procedure described can be employed to optimize the properties of Bi(2)Te(3) for study as a topological insulator.
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Affiliation(s)
- Y S Hor
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
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31
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Dubey JP, Rajendran C, Costa DGC, Ferreira LR, Kwok OCH, Qu D, Su C, Marvulo MFV, Alves LC, Mota RA, Silva JCR. New Toxoplasma gondii Genotypes Isolated from Free-Range Chickens from the Fernando de Noronha, Brazil: Unexpected Findings. J Parasitol 2010; 96:709-12. [DOI: 10.1645/ge-2425.1] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Hou DY, Wang J, Qu D, Luan ZK, Zhao CW, Ren XJ. Desalination of brackish groundwater by direct contact membrane distillation. Water Sci Technol 2010; 61:2013-2020. [PMID: 20388998 DOI: 10.2166/wst.2010.110] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The direct contact membrane distillation (DCMD) applied for desalination of brackish groundwater with self-made polyvinylidene fluoride (PVDF) membranes was presented in the paper. The PVDF membrane exhibited high rejection of non-volatile inorganic salt solutes and a maximum permeate flux 24.5 kg m(-2) h(-1) was obtained with feed temperature at 70 degrees C. The DCMD experimental results indicated that the feed concentration had no significant influence on the permeate flux and the rejection of solute. When natural groundwater was used directly as the feed, the precipitation of CaCO(3) would be formed and clog the hollow fibre inlets with gradual concentration of the feed, which resulted in a rapid decline of the module efficiency. The negative influence of scaling could be eliminated by acidification of the feed. Finally, a 250 h DCMD continuous desalination experiment of acidified groundwater with the concentration factor at constant 4.0 was carried out. The permeate flux kept stable and the permeate conductivity was less than 7.0 microS cm(-1) during this process. Furthermore, there was no deposit observed on the membrane surface. All of these demonstrated that DCMD could be efficiently used for production of high-quality potable water from brackish groundwater with water recovery as high as 75%.
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Affiliation(s)
- D Y Hou
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, People's Republic Of China.
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Abstract
Endothelial protein C receptor (EPCR) plays an important role in the protein C anticoagulation pathway. Previously, we have reported that EPCR can be shed from the cell surface, and that this is mediated by an unidentified metalloproteinase. In this study, we demonstrate that tumor necrosis factor-alpha converting enzyme/ADAM17 (TACE) is responsible for EPCR shedding. Phorbol-12-myristate 13-acetate (PMA)-stimulated EPCR shedding is reduced by approximately 50% in HEK293 cells transfected with human EPCR cDNA and by 60% in human umbilical vein endothelial cells after transfection of TACE small interfering RNA (siRNA) into these cells. PMA-stimulated EPCR shedding is completely blocked in fibroblasts from TACE-deficient mice transfected with human EPCR cDNA, and restored by transfection of TACE cDNA into this cell line. To characterize the EPCR sequence requirement for shedding, we generated several mutants of EPCR. Replacing amino acids from residue 193 to residue 200 with the FLAG sequence (DYKDDDDK) completely blocks EPCR shedding, whereas a single amino acid substitution in this region has less effect on EPCR shedding.
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Affiliation(s)
- D Qu
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA
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34
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Abstract
Combining theoretical and experimental techniques, we investigate the structure formation of charged colloidal suspensions of silica particles in bulk and in spatial confinement (slit-pore geometry). Our focus is to identify characteristic length scales determining typical quantities, such as the position of the main peak of the bulk structure factor and the period of the oscillatory force profile in the slitpore. We obtain these quantities from integral equations/SANS experiments (bulk) and Monte Carlo simulations/colloidal probe-AFM measurements (confinement), in which the theoretical calculations are based on the Derjaguin-Landau-Verwey-Overbeck (DLVO) potential. Both in bulk and in the slitpore, we find excellent qualitative and quantitative agreement between theory and experiment as long as the ionic strength chosen in the DLVO potential is sufficiently low (implying a relatively long-ranged interaction). In particular, the bulk properties of these systems obey the widely accepted density scaling of xi proportional to phi(-1/3). On the other hand, systems with larger ionic strengths and, consequently, more short-ranged interactions do not obey such power law behavior and rather resemble an uncharged hard-sphere fluid, in which the relevant length scale is the particle diameter.
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Affiliation(s)
- Sabine H L Klapp
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Sekretariat C7, Technische Universität Berlin, Strasse des 17. Juni 115, D-10623 Berlin, Germany.
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35
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Qu D, Wang Y, Song Y, Esmon NL, Esmon CT. The Ser219-->Gly dimorphism of the endothelial protein C receptor contributes to the higher soluble protein levels observed in individuals with the A3 haplotype. J Thromb Haemost 2006; 4:229-35. [PMID: 16409473 DOI: 10.1111/j.1538-7836.2005.01676.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The endothelial cell protein C receptor (EPCR) plays an important role in regulating blood coagulation and in activated protein C-mediated anti-inflammatory and antiapoptotic processes. Recent studies reported that there are polymorphisms in the human EPCR gene. One of the polymorphisms (haplotype A3) results in substitution of the Ser at residue 219 with Gly in the transmembrane domain. This haplotype is associated with increased plasma levels of soluble EPCR and is a candidate risk factor for thrombosis. We established stable cell lines expressing either the EPCR A1 (Ser at residue 219) or A3 (Gly at residue 219) haplotype. Both constitutive and PMA-stimulated shedding are five- to sevenfold higher in the A3 cell line than the A1 cell line. We also isolated human umbilical vein endothelial cells (HUVEC) from A1/A1 or A1/A3 origins. PMA-stimulated shedding is fourfold higher in HUVEC derived from A1/A3 origin than from A1/A1 origin. After PMA treatment, the rate of human protein C activation decreased 36% in HUVEC derived from A1/A3 origin, while it only decreased 18% in HUVEC derived from A1/A1 origin. These results indicate that the A3 haplotype does promote cellular shedding in either 293 or endothelial cells and therefore is likely directly contributory to the higher soluble EPCR levels seen in patients carrying this haplotype.
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Affiliation(s)
- D Qu
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA
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Qu D, Grischkowsky D. Observation of a new type of THz resonance of surface plasmons propagating on metal-film hole arrays. Phys Rev Lett 2004; 93:196804. [PMID: 15600864 DOI: 10.1103/physrevlett.93.196804] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2004] [Indexed: 05/24/2023]
Abstract
Highly conducting metal-film subwavelength hole arrays, lithographically fabricated on high-resistivity silicon wafers in optical contact with thick silicon plates, have been characterized by terahertz time-domain spectroscopy with subpicosecond resolution and over a frequency range from 0.5 to 3 THz with 5 GHz resolution. A well-defined ringing structure extending to more than 250 psec is observed on the trailing edge of the transmitted THz pulse. In the frequency domain this ringing structure corresponds to a new type of extremely sharp resonant line structure between the fundamental surface plasmon modes of the hole array. A simple theoretical model is presented and shows good agreement with the experimental data.
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Affiliation(s)
- Dongxia Qu
- School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA
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Qu D, Ratering S, Schnell S. Microbial reduction of weakly crystalline iron (III) oxides and suppression of methanogenesis in paddy soil. Bull Environ Contam Toxicol 2004; 72:1172-81. [PMID: 15362446 DOI: 10.1007/s00128-004-0367-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Affiliation(s)
- D Qu
- Max-Planck-Institute for Terrestrial Microbiology, Karl-Frisch-Strasse, 35043 Marburg, Germany
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Zheng BJ, Zhou J, Qu D, Siu KL, Lam TW, Lo HY, Lee SS, Wen YM. Selective functional deficit in dendritic cell--T cell interaction is a crucial mechanism in chronic hepatitis B virus infection. J Viral Hepat 2004; 11:217-24. [PMID: 15117323 DOI: 10.1111/j.1365-2893.2004.00497.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A defect in specific T cell immunity has long been assumed to be the central mechanism of persistent Hepatitis B virus (HBV) infection. Recent studies on HBV transgenic mice have suggested, however, that functional deficit of dendritic cells (DC) was an underlying cause for the T cell dysfunction. The functions of monocyte-derived DC were determined by studying 75 subjects that included chronic hepatitis B patients with low or high HBV load; antibody to hepatitis B surface antigen (anti-HBs) positive individuals who had recovered completely from previous acute HBV infection; healthy donors who had received hepatitis B vaccination and were anti-HBs positive; and immunologically naïve to HBV or the vaccine individual. Impaired interactions between monocyte-derived DC and T cells were shown in chronic HBV infection patients, especially in those with active virus replication. The dysfunctions included: (i) failure of DC to increase human leukocyte antigen (HLA-II), B7 expression and interleukin-12 secretion in responses to hepatitis B surface antigen (HBsAg), (ii) defective induction of T cell proliferative response to HBsAg, (iii) failure to activate T cells to produce cytokines and (iv) deficit in the induction of antigen specific cytotoxic T lymphocytes (CTLs). In vitro treatment of DC with tumour necrosis factor-alpha improved HLA-II and B7 expression, as well as Th cell and CTL responses. It is concluded that defective DC-T cell interactions may account for the specific T cell immune defects in chronic HBV infection. Immunotherapy that aims at restoring DC functions could offer a new opportunity for effectively managing persistent HBV infections.
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Affiliation(s)
- B J Zheng
- Department of Microbiology, The University of Hong Kong, Hong Kong
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39
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Abstract
We present experimental results of the transmission magnitude and phase change of terahertz pulses through thin metallic films patterned with subwavelength hole arrays on silicon wafers. Terahertz time-domain spectroscopy measurements reveal a sharp phase peak centered on the surface plasmon resonance. Correspondingly, and consistent with the Kramers-Kronig relations, the measured transmission magnitude has the shape of the derivative of this peak. In addition, we determine that the aperture shape has a notable effect on the transmission properties of two-dimensional hole arrays.
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Affiliation(s)
- Dongxia Qu
- School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA
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Qu D, Schnell S. [Microbial reduction ability of various iron oxides in pure culture experiment]. Wei Sheng Wu Xue Bao 2001; 41:745-9. [PMID: 12552834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
The microbial reduction of ferrihydrite, lepidocrocite, hematite, goethite and aluminum-substituted iron oxides were examined by iron-reducer GS-15 under anaerobic pure culture condition. The results indicated that the ferrihydrite and lepidocrocite can be rapidly reduced by iron-reducer, and the percentage of microbial reduction are respectively 95.4% and 95.8% after 4 days incubation at 25 degrees C. The other iron oxides like hematite, Al-hematite, goethite and Al-goethite are very difficult to reduce during short-term incubation. The amounts of Fe(III)-reducing, Fe(II)-producing and Fe-reducing calculated by acetate consumption are identical under the conditions of lower concentration iron oxides addition.
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Affiliation(s)
- D Qu
- Northwest Science and Technology University of Agriculture and Forestry, Yangling 712100, China
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Biguzzi E, Merati G, Liaw PC, Bucciarelli P, Oganesyan N, Qu D, Gu JM, Fetiveau R, Esmon CT, Mannucci PM, Faioni EM. A 23bp insertion in the endothelial protein C receptor (EPCR) gene impairs EPCR function. Thromb Haemost 2001; 86:945-8. [PMID: 11686350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
EPCR is a type I transmembrane protein, highly expressed on the endothelium of large vessels, that binds protein C and augments its activation. In this study, a 23bp insertion in the EPCR gene was found in 4/198 survivors of myocardial infarction and 3/194 patients with deep vein thrombosis. The EPCR gene with the insertion predicts a protein that lacks part of the extracellular domain, the transmembrane domain and the cytoplasmic tail. Expression studies showed that the truncated protein is not localized on the cell surface, cannot be secreted in the culture medium, and does not bind activated protein C. Since protein C activation depends on the concentration of EPCR, patients with the EPCR insertion could have a diminished protein C activation capacity. Further clinical studies of adequate samples size are necessary to establish whether or not the EPCR insertion predisposes to the development of thrombotic events.
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Affiliation(s)
- E Biguzzi
- Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, IRCCS Maggiore Hospital and University of Milano, Italy.
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Jin D, Chen J, Qu D. [Anterior thoracolumbar K-plate fixation system: design and clinical application]. Zhonghua Wai Ke Za Zhi 2001; 39:704-7. [PMID: 11769608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVES To develop an anterior thoracolumbar K-plate fixation system and to report its preliminary clinical application. METHODS The K-plate system was developed with titanium alloy(TC4, Ti6A14V) and self-locking screw design was used. In 23 cases treated with this system, 13 had thoracolumbar fracture, 9 tuberculosis, and back syndrome after lumbar TFC operation. RESULTS All the 23 cases were followed up for one to ten months, averaging 4.5 months. In the 13 cases of fracture, body height of injured vertebra were regained completely, and neurologic deficits improved 2.1 grades in Frankel scale. In the 9 cases of tuberculosis, neurologic functions recovered and no local recurrence was noted. In one case of back syndrome, symptoms and signs did not occur after anterior TFC removal, interbody fusion, and K-plate fixation. This patient received second operation to remove K-plate 3 months after solid osseous fusion, and no electric erosion or obvious tissue reaction was found. 18 of the 23 cases were followed up for four months or more, and solid fusion was found in these patients in three to four months after surgery. No early complications related to implant were noted during the follow-up. CONCLUSION This K-plate system is suitable for reconstruction of thoracolumbar stability after anterior decompression in indicated patients.
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Affiliation(s)
- D Jin
- Department of Orthopaedic Surgery, Nanfang Hospital, First Military Medical University, Guangzhou 510515, China
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Jin D, Chen J, Qu D. [Development and clinical application of posterior STBtrade mark thoracolumbar transpedicular screw-plate fixation system]. Zhonghua Yi Xue Za Zhi 2001; 81:794-7. [PMID: 11798968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To develop a posterior STBTM thoracolumbar transpedicular screw-plate system and to apply it clinically. METHODS A posterior STBTM thoracolumbar transpedicular screw-plate system was developed with titanium alloy (TC4, Ti64A14V) and was used, from December 1999 to July 2000, to treat 63 cases with thoracolumbar or lumbar injuries or diseases, including thoracolumbar fracture/dislocation (33 cases), lumbar spondylosis and spondylolisthesis (16 cases), lumbar spondylosis and disk protrusion (6 cases), degenerative lumbar instability (4 cases), kyphosis due to ankylosing spondylitis (2 cases), and tuberculosis of spine (2 cases). RESULTS The 33 cases with thoracolumbar fracture/dislocation showed perfect reduction and fixation after the operation. The height of injured vertebral bodies returned to normal. One month later, all patients with neurological deficits, except the 6 cases with neurological deficits of Frankel grade A, showed improvement by 1 approximately 3 Frankel grades. The radicular symptoms in the 26 patients with lumbar spondylolisthesis, lumbar spondylosis and disk protrusion, and degenerative lumbar instability disappeared after operation. Among those cases, complete reduction was achieved in the 7 cases with grade I spondylolisthesis and 7 out of the 9 cases with grade II spondylolisthesis, and incomplete reduction (grade I) was seen in the remaining 2 cases with grade II spondylolisthesis. Forty cases were followed up for 5 months or over in out-patient department, no complication was found. CONCLUSION The posterior STBTM thoracolumbar transpedicular screw-plate system has the advantages of biological stability, excellent reduction capacity, easiness of operation, and positive clinical effectiveness.
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Affiliation(s)
- D Jin
- Department of Orthopedics, Nanfang Hospital, Guangzhou 510515, China
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Chen Y, Li J, Zeng M, Lu L, Qu D, Mao Y, Fan Z, Hua J. [The inhibitory effect of oxymatrine on hepatitis C virus in vitro]. Zhonghua Gan Zang Bing Za Zhi 2001; 9 Suppl:12-4. [PMID: 11509127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
OBJECTIVE To study the inhibitory effect of oxymatrine on HCV in vitro. METHODS SMMC-7721 cells transfected with pBK-HCV using lipofectin transfection protocal were treated with oxymatrine. bDNA signal amplification assay and MTT colorimetric assay were used for intracellular HCV RNA and cytotoxicity. RESULTS The stable HCV expression cell model established here could be used as a tool for medicine screen. Oxymatrine at the concentration of 100~1000 mug/ml could significantly decrease the level of intracellular HCV RNA. No cytotoxicity was shown in such concentrations. CONCLUSIONS Oxymatrine has an anti-HCV potential activity in vitro.
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Affiliation(s)
- Y Chen
- Shanghai Institute of Digestive Diseases, Renji Hospital, Shanghai Second Medical University, Shanghai 200001, China
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Qu D, Liu C, Zhang Y, Ma Q. [Construction of plasmid gene bank of V. cholerae O139 and detection of O-antigen genes]. Wei Sheng Wu Xue Bao 2001; 41:65-9. [PMID: 12549191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
Because O-antigen biosynthesis genes are a tandem gene cluster. Gnomic fragments of 4-20 kilobases (kb) were obtained by digesting genomic DNA of V. cholerae O139 with restriction endonuclease EcoRI, then plasmid gene bank was constructed. Recombinant colony, E. coli DH5 alpha (pMG320), expressing O-antigen of V. cholerae O139 was detected from the bank by immunological agglutinative reaction. The futher analysis showed O-antigen expressed by recombinant colony had both immunogenicity and reactogenicity, and the size of O-antigen biosynthesis genes was about 4.6 kb.
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Affiliation(s)
- D Qu
- Institute of Biotechnology, Academy of Military Medical Sciences, Beijing 100850, China
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Long JE, Huang LN, Wang WY, Cheng MJ, Wen YM, Yuan ZH, Qu D. Cloning and Expression of Chinese Duck Interferon-gamma Gene. Sheng Wu Hua Xue Yu Sheng Wu Wu Li Xue Bao (Shanghai) 2001; 33:707-712. [PMID: 12035067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
The efficacy of cytokine therapy has been demonstrated in several viral diseases. Interferon-gamma is a cytokine that has potent antiviral property and immunomodulatory activity. To investigate the role of IFN-gamma in viral clearance during natural infection and to define the antiviral mechanism, DHBV-infected ducks was used as an animal model. To clone, express, and develop the method of quantifying DuIFN-gamma gene transcription and expression, DuIFN -gamma cDNA was amplified by RT-PCR from PHA stimulated duck PBMC. Recombinant plasmid expressing DuIFN-gamma was used to transfect COS-7, and the cell culture supernatant was analyzed by CPE inhibitory assay and MTT methods to determine the antiviral titer of IFN-gamma. The GST-DuIFN-gamma fusion protein was expressed in E.coli and purified using the GST sepharose 4B. Results indicated that the supernatant collected from COS-7 cells transfected with DuIFN-gamma cDNA was able to prevent duck fibroblasts from VSV induced CPE in a dose dependent manner. An anti-DuIFN-gamma antibody neutralized this antiviral activity.
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Affiliation(s)
- J E Long
- Department of Molecular Virology, Medical Center of Fudan University, Shanghai 200032, China.
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Kokkotou E, Mastaitis JW, Qu D, Hoersch D, Slieker L, Bonter K, Tritos NA, Maratos-Flier E. Characterization of [Phe(13), Tyr(19)]-MCH analog binding activity to the MCH receptor. Neuropeptides 2000; 34:240-7. [PMID: 11021987 DOI: 10.1054/npep.2000.0821] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Melanin concentrating hormone (MCH), a hypothalamic neuropeptide, is an important regulator of energy homeostasis in mammals. Characterization of an MCH specific receptor has been hampered by the lack of a suitable radioligand. The [Phe(13), Tyr(19)]-MCH analog has been shown by different investigators to bind specifically to cell lines of epithelial or pigment cell origin. Recently, using functional assays, the MCH receptor has been characterized as a seven transmembrane G-coupled protein initially identified as SLC-1. In the present study, we used tyrosine iodinated [Phe(13), Tyr(19)]-MCH analog, which stimulates food intake in a manner similar to that of MCH, as well as native MCH to conduct binding studies. Specific binding could not be demonstrated in intact cells of several cell lines, including A431 and B16. Specific binding associated with membranes localized to the microsomal, not the plasma membrane, fraction. Message for SLC-1 was absent in these cell lines, as assessed by Northern blot analysis. We conclude that cells previously reported to express the MCH receptor do not express SLC-1 and that both iodinated MCH and the [Phe(13), Tyr(19)]-MCH have a large component of non-specific binding. These ligands may be useful for binding studies in transfected cells with high levels of SLC-1 expression. However they do not appear to be suitable for screening for the MCH receptor as most cells demonstrate significant low affinity non-specific binding.
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Affiliation(s)
- E Kokkotou
- Research Division, Joslin Diabetes Center and Harvard Medical School, 1 Joslin Place, Boston, MA 02215, USA
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Abstract
Previous studies observed that there is about 100 ng/ml soluble endothelial cell protein C receptor (EPCR) in human plasma and that the levels increase in inflammatory diseases. In this study we examine the potential mechanisms involved in release of EPCR from cells. We find that EPCR is released from the surface of endothelium and transfected 293 cells by a metalloprotease in a constitutive fashion. The mass of soluble EPCR is 4 kDa less than intact EPCR. Release is blocked by either the hydroxamic acid based inhibitor, KD-IX-73-4 or by 1,10-phenanthroline, but not by matrix metalloprotease inhibitors. Release is stimulated by phorbol 12-myristate 13-acetate, thrombin, interleukin-1beta, and hydrogen peroxide. Stimulation with these agents reduces EPCR expression levels sufficiently to decrease the rate of protein C activation to a limited extent. The influence of phorbol 12-myristate 13-acetate on both EPCR release and inhibition of protein C activation are enhanced by microtubule disruption with nocodazole. EPCR release is augmented by transfection of EPCR expressing 293 cells with caveolin, suggesting that release is caveolae dependent. These studies indicate that metalloproteolytic release of EPCR is a highly regulated process that is sensitive to both coagulation factors and inflammatory mediators.
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Affiliation(s)
- J Xu
- Howard Hughes Medical Institute, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma 73104, USA
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