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Wang PJ, Wang DH, Gao Y, Shou YR, Liu JB, Mei ZS, Cao ZX, Pan Z, Kong DF, Xu SR, Liu ZP, Chen SY, Zhao JR, Geng YX, Zhao YY, Yan XQ, Ma WJ. A versatile control program for positioning and shooting targets in laser-plasma experiments. Rev Sci Instrum 2023; 94:093303. [PMID: 37772947 DOI: 10.1063/5.0158103] [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: 05/15/2023] [Accepted: 09/02/2023] [Indexed: 09/30/2023]
Abstract
We introduce a LabVIEW-based control program that significantly improves the efficiency and flexibility in positioning and shooting solid targets in laser-plasma experiments. The hardware driven by this program incorporates a target positioning subsystem and an imaging subsystem, which enables us to install up to 400 targets for one experimental campaign and precisely adjust them in six freedom degrees. The overall architecture and the working modes of the control program are demonstrated in detail. In addition, we characterized the distributions of target positions of every target holder and simultaneously saved the target images, resulting in a large dataset that can be used to train machine learning models and develop image recognition algorithms. This versatile control system has become an indispensable platform when preparing and conducting laser-plasma experiments.
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Affiliation(s)
- P J Wang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
- Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Dresden 01328, Germany
| | - D H Wang
- State Key Laboratory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology, Xi'an 710024, China
| | - Y Gao
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Y R Shou
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - J B Liu
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Z S Mei
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Z X Cao
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Z Pan
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - D F Kong
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - S R Xu
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Z P Liu
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - S Y Chen
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - J R Zhao
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Y X Geng
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Y Y Zhao
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - X Q Yan
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
- Beijing Laser Acceleration Innovation Center, Huairou, Beijing 101400, China
- Institute of Guangdong Laser Plasma Technology, Baiyun, Guangzhou 510540, China
| | - W J Ma
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
- Beijing Laser Acceleration Innovation Center, Huairou, Beijing 101400, China
- Institute of Guangdong Laser Plasma Technology, Baiyun, Guangzhou 510540, China
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Deb B, Rogers AJ, Bhatia NK, Baykaner T, Turakhia M, Clopton PL, Chang HJ, Brodt C, Narayan SM, Wang PJ, Viswanathan MN. Machine learned clusters explain heterogeneity in outcomes from map-guided ablation of Atrial Fibrillation results from the large PROspective STanford AF Registry (ProSTAR). Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.474] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Several mapping systems are being introduced to guide atrial fibrillation (AF) ablation to patient-specific regions of interest. However, results have been extremely heterogeneous between studies, ranging from very poor to very promising. It is unknown if this reflects specific patient characteristics or procedural factors because most prior series were middle sized (N∼30–100 patients).
Purpose
To study 1 year and 3 year very long-term outcomes from map guided AF-driver ablation in a large patient registry with multiple operators, to identify clinical and procedural features influencing outcomes. In real-world AF patients with diverse comorbidities, we applied a consistent patient-tailored AF mapping and ablation strategy, monitored outcomes carefully and applied statistical and unsupervised machine learning approaches to identify features of success and failure.
Method
We studied 632 consecutive patients (65±10 y, 178 F) undergoing ablation for drug-refractory AF. 59.7% had persistent AF, and 29.9% had prior unsuccessful ablation (median 1 procedure). All patients underwent pulmonary vein isolation (PVI), followed by ablation of AF regions of interest mapped from 64 pole baskets (RhythmView, Abbott, IL), by 11 operators. Patients were followed using ambulatory ECG monitors quarterly for one year, and at the time of symptoms for 3 years.
Results
Fig. 1A shows overall freedom from AF at 1-year of 77.5% (95% CI: 74.2%, 80.9%) and at 3 years of 55.5% (95% CI: 51.2%, 60.1%). Freedom from AF/AT at 1-year was 70.1% (95% CI: 66.5%, 73.8%), and at 3 years was 48.6% (95% CI: 44.3%, 53.3%). Success was higher in patients with procedural termination, first ablation versus prior unsuccessful procedures, for paroxysmal AF than non-paroxysmal AF (1 year: AT/AF freedom 74.9% versus 66.7%, p=0.006), and smaller left atrium. Three clusters (Fig 1B) were identified comprising CHA2DS2VASc score, enlarged LA, prior failed case, presenting rhythm and termination during the procedure (Table 2). At 1 year, freedom from AT/AF was 77.8% (95% CI: 72.2%, 82.1%) for cluster 3 and 56.2% (95% CI: 48.3%, 65.4%) for cluster 1 (Fig. 1B).
Conclusion
In our large registry of N=632 patients undergoing AF-map guided ablations, machine learned clusters identified cohorts with success of 56.2 to 77.8% at 1 year. Future studies should identify if lower success represents technical challenges, such as difficulties in mapping very large atria, or more difficult to treat mechanisms. These results may inform patient inclusion and ablation strategy in upcoming AF treatment trials.
Funding Acknowledgement
Type of funding sources: Public grant(s) – National budget only. Main funding source(s): National budget only - NIH, R01 HL149134, R01HL83359
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Affiliation(s)
- B Deb
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - A J Rogers
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - N K Bhatia
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - T Baykaner
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - M Turakhia
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - P L Clopton
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - H J Chang
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - C Brodt
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - S M Narayan
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - P J Wang
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
| | - M N Viswanathan
- Stanford University School of Medicine, Cardiology , Palo Alto , United States of America
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Hua KL, Huo MK, Dong ZC, Li S, Wang PJ, Li Y, Ren YK. [Study on the dynamic changes of peripheral platelet-to-lymphocyte ratio in the prognosis of neoadjuvant chemotherapy patients with gastric cancer]. Zhonghua Yi Xue Za Zhi 2022; 102:858-863. [PMID: 35330579 DOI: 10.3760/cma.j.cn112137-20211204-02700] [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 investigate the significance of platelet lymphocyte ratio (PLR) before and after neoadjuvant chemotherapy in advanced gastric cancer (AGC). Methods: The medical records of 247 AGC patients who underwent surgery between May 2015 and October 2016 were retrospectively reviewed. The relationship between PLR value and its changes before and after neoadjuvant therapy and clinicopathological features and prognosis was further analyzed. Results: △PLR was defined according to the different states of PLR before and after neoadjuvant therapy. If negative value was defined as"Reduced Group"(138) and positive value or 0 was defined as "Unreduced group"(109). There were statistical differences between the two groups of△PLR in tumor size, nerve invasion, presence or absence of vascular tumor thrombus, ypT staging, ypN staging, ypTNM staging, and pathological response (all P<0.05), but there was no statistical difference between age, gender, and postoperative adjuvant chemotherapy (all P>0.05). Survival analysis showed that the 5-year disease-free survival rates between the two groups were 39.0% and 54.0%, respectively (P=0.025); the 5-year overall survival rates between the two groups were 41.8% and 58.1%, respectively (P=0.035); the difference were statistically significant. Multivariate analysis showed that ypT3-4 stage, ypN3b stage and △PLR were independent risk factors for 5-year disease-free survival rate (HR=2.731/2.676, 95%CI: 1.026-7.268/1.014-6.985; HR=4.717, 95%CI: 1.922-11.579; HR=2.854, 95%CI: 1.117-4.124; all P<0.05) and 5-year overall survival rate (HR=3.226/2.655, 95%CI: 1.280-9.227/0.945-7.548; HR=4.550, 95%CI: 1.842-11.239; HR=2.897, 95%CI: 1.049-5.251; all P<0. 05). Conclusion: △PLR can better predict the prognosis of AGC patients receiving neoadjuvant chemotherapy.
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Affiliation(s)
- K L Hua
- Department of General Surgery, Henan Cancer Hospital, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - M K Huo
- Department of General Surgery, Henan Cancer Hospital, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - Z C Dong
- Department of General Surgery, Henan Cancer Hospital, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - S Li
- Department of General Surgery, Henan Cancer Hospital, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - P J Wang
- Department of General Surgery, Henan Cancer Hospital, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
| | - Y Li
- The Third Department of Surgery, the Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - Y K Ren
- Department of General Surgery, Henan Cancer Hospital, Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China
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Li LH, Dang XW, Zhang G, Li L, Li SX, Wang PJ, Shen DQ, Liu SY. [Effect of thrombolytic therapy and influencing factors of Budd-Chiari syndrome with inferior vena cava thrombosis]. Zhonghua Wai Ke Za Zhi 2021; 59:929-933. [PMID: 34743456 DOI: 10.3760/cma.j.cn112139-20201219-00868] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To examine the effect of thrombolytic therapy of Budd-Chiari syndrome (B-CS) with inferior vena cava (IVC) thrombosis, and the prognosis factors of it. Methods: The clinical data of 67 patients of B-CS with IVC thrombosis treated in the Department of Hepatopancreatobiliary Surgery, the First Affiliated Hospital of Zhengzhou University from January 2013 to August 2020 were analyzed retrospectively. There were 30 males and 37 females. The age was (47.7±11.1) years(range: 18 to 72 years). All patients received catheter directed thrombolysis, and the thrombolysis process, complications and outcomes were analyzed. All patients received IVC balloon angioplasty after thrombolytic therapy. The t test, χ2 test, Mann-Whitney U test were used for univariate analysis of the prognosis factors of thrombolysis effects, while unconditional Logistic regression model were used for multivariate analysis. Results: In the 67 patients, 47 cases succerssed in thrombolytic therapy. The successful rates of thrombolysis at 1-, 2-, 3- and 4-week were 9.0%, 29.9%, 64.2% and 70.1%, respectively. The rates of thrombolytic catheter-related infection at 1-, 2-, 3- and 4-week were 1.5%, 4.5%, 14.9% and 31.3%, respectively. No serious complications such as symptomatic and acute pulmonary embolism occurred during perioperative period of IVC balloon angioplasty. Univariate analysis showed that differences in thrombus length ((36.7±18.1) mm vs. (52.0±16.4) mm, t=-3.234, P=0.002), Child-Pugh classification (class A/B/C: 37/8/2 vs. 10/8/2, Z=-2.310, P=0.021) and pre-opening IVC proportion (68.1% (32/47) vs. 35.0% (7/20), χ²=6.313, P=0.012) were statistically significant. The thrombus length (OR=0.948, 95%CI: 0.913 to 0.984, P=0.005), pre-opening IVC (OR=5.451, 95%CI: 1.469 to 20.228, P=0.011) were independent prognosis factors of thrombolytic effect. Conclusions: Thrombolytic therapy for B-CS with IVC thrombosis were satisfactory, and the thrombolysis duration should be confined within 3 weeks. IVC balloon angioplasty is safe and effective for patients failing in thrombolysis, and pre-opening IVC is an important method to improve the thrombolytic effect.
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Affiliation(s)
- L H Li
- Department of Hepatopancreatobiliary Surgery, the First Affiliated Hospital of Zhengzhou University, Budd-Chiari Syndrome Diagnosis and Treatment Center of Henan Province, Zhengzhou 450052, China
| | - X W Dang
- Department of Hepatopancreatobiliary Surgery, the First Affiliated Hospital of Zhengzhou University, Budd-Chiari Syndrome Diagnosis and Treatment Center of Henan Province, Zhengzhou 450052, China
| | - G Zhang
- Department of Hepatopancreatobiliary Surgery, the First Affiliated Hospital of Zhengzhou University, Budd-Chiari Syndrome Diagnosis and Treatment Center of Henan Province, Zhengzhou 450052, China
| | - L Li
- Department of Hepatopancreatobiliary Surgery, the First Affiliated Hospital of Zhengzhou University, Budd-Chiari Syndrome Diagnosis and Treatment Center of Henan Province, Zhengzhou 450052, China
| | - S X Li
- Department of Hepatopancreatobiliary Surgery, the First Affiliated Hospital of Zhengzhou University, Budd-Chiari Syndrome Diagnosis and Treatment Center of Henan Province, Zhengzhou 450052, China
| | - P J Wang
- Department of Hepatopancreatobiliary Surgery, the First Affiliated Hospital of Zhengzhou University, Budd-Chiari Syndrome Diagnosis and Treatment Center of Henan Province, Zhengzhou 450052, China
| | - D Q Shen
- Department of Hepatopancreatobiliary Surgery, the First Affiliated Hospital of Zhengzhou University, Budd-Chiari Syndrome Diagnosis and Treatment Center of Henan Province, Zhengzhou 450052, China
| | - S Y Liu
- Department of Hepatopancreatobiliary Surgery, the First Affiliated Hospital of Zhengzhou University, Budd-Chiari Syndrome Diagnosis and Treatment Center of Henan Province, Zhengzhou 450052, China
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Cheng SH, Ni J, Liu J, Huang F, Wang PJ. [The role of Artificial intelligent-based FFR CT in assessing the hemodynamic relevance of deep myocardial bridge of the left anterior descending coronary artery]. Zhonghua Yi Xue Za Zhi 2021; 101:464-469. [PMID: 33631889 DOI: 10.3760/cma.j.cn112137-20200924-02709] [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 investigate the role of artificial intelligence-based coronary CT blood flow reserve score (FFRCT) in assessing hemodynamic relevance in patients with deep myocardial bridge (MB) of the left anterior descending coronary artery. Methods: A total of 113 patients diagnosed with deep MB of the left anterior descending coronary artery by coronary CT angiography (CCTA) at the Department of Radiology of Tongji Hospital Affiliated to Tongji University from January 2017 to December 2019 were retrospectively analyzed. The location, length, depth, and degree of systolic compression of the MB were measured. The artificial intelligence-based coronary FFRCT software was employed to calculate the FFRCT value of the deep MB of the left anterior descending coronary artery. With the boundary of 0.80, all patients were divided into FFRCT normal group (FFRCT>0.80) and FFRCT abnormal group (FFRCT≤0.80), and the relationship between FFRCT abnormality and the location, length, depth, and degree of systolic stenosis of the deep MB of the left anterior descending branch was analyzed. The effectiveness of the receiver operating characteristic (ROC) curve in predicting FFRCT abnormalities was measured by using ROC curve to analyze the length, depth, and degree of systolic stenosis of MB. Results: There were no significant differences in age, gender and high-risk factors between FFRCT normal group (n=79) and FFRCT abnormal group (n=34) (P>0.05). In terms of clinical symptoms, unstable angina, asymptomatic myocardial ischemia, stable angina in the FFRCT normal group were 15.2%, 41.8%, 32.9%,respectively, while 32.4%, 23.5%, 35.3% in the FFRCT abnormal group,respectively. Except for unstable angina (χ²=4.32,P=0.038), there were no significant differences in asymptomatic myocardial ischemia and stable angina between the two groups (χ²=3.42, 0.06, P>0.05). The length of deep MB was about (36±5) mm in the FFRCT normal group and (44±5) mm in the FFRCT abnormal group, respectively. The difference between the two groups was statistically significant (t=-7.703, P<0.001). The ROC curve showed that the optimal critical value of the length of the deep MB was 39.7 mm, the area under the curve was 0.88 (95%CI:0.81-0.95, P<0.001), and the accuracy rate of diagnosing FFRCT ≤0.80 was 82.3%. Conclusion: FFRCT value is of great value in the evaluation of hemodynamics in patients with deep myocardial bridge of left anterior descending coronary artery, and the length of deep myocardial bridge is an important factor affecting FFRCT value.
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Affiliation(s)
- S H Cheng
- Department of Radiology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, China
| | - J Ni
- Department of Radiology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, China
| | - J Liu
- Department of Radiology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, China
| | - F Huang
- Department of Radiology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, China
| | - P J Wang
- Department of Radiology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, China
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Ni J, Wang PJ. [Present and future: artificial intelligence in medical imaging]. Zhonghua Yi Xue Za Zhi 2021; 101:455-457. [PMID: 33631887 DOI: 10.3760/cma.j.cn112137-20201213-03351] [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
Artificial intelligence (AI) is a hot point in clinical medicine research. In recent years, AI has played an important role in recognizing the lesion, improving the diagnostic accuracy and assessing the diagnostic efficacy. To accelerate the pace of AI industry, it should be a first thing to improve relevant industrial policies and regulations and to build a transformation platform for industry-university-research. All these will contribute to the standardization in further development of medical imaging AI industry.
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Affiliation(s)
- J Ni
- Department of Medical Imaging, Tongji Hospital of Tongji University, Shanghai 200065, China
| | - P J Wang
- Department of Medical Imaging, Tongji Hospital of Tongji University, Shanghai 200065, China
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Hao JH, Liu WD, Wang ZD, Wang PJ, Zhang M, Jiang QL, Liu C, Wang JY, Zhang LY. [Retrospective analysis of mechanical thrombectomy for distal branch occlusion of middle cerebral artery]. Zhonghua Yi Xue Za Zhi 2020; 100:1240-1244. [PMID: 32344496 DOI: 10.3760/cma.j.cn112137-20191120-02531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the necessity, feasibility, technical points, operative complications and prognosis of mechanical thrombectomy for distal branch occlusion of middle cerebral artery. Methods: Mechanical thrombectomy was performed on 42patients (28 males,14 females; age ranged from 43 to 88 years, mean 65.48years)with distal branch occlusion of middle cerebral artery (M2, M3), between May 2017 to July 2019. Theclinical feature was retrospectively analyzed. The NIHSS score before operation, 24 hours after operation and 1 week after operation, the recanalization of occluded vessels during operation, the complications and the recovery after 3 months (3 months mRS score) were analyzed. Results: Of the 42 patients, 38 patients were successfully recanalized, and the recanalization rate was 90.48%. Postoperative hemorrhage in 6 cases and vasospasm in 17 cases. At 90 days after operation, the mRS score was 0 in 13 cases, 1 in 11 cases, 2 in 6 cases, and 0 cases died. Conclusions: Mechanical thrombotomy is safe and feasible for patients with distal branch occlusion of middle cerebral artery (M2, M3). However, the risks and benefits of patients should be fully considered.
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Affiliation(s)
- J H Hao
- Departmen of Neurosurgery, Liaocheng Brain Hospital, Liaocheng 252000, China
| | - W D Liu
- Departmen of Neurosurgery, Liaocheng Brain Hospital, Liaocheng 252000, China
| | - Z D Wang
- Departmen of Neurosurgery, Liaocheng Brain Hospital, Liaocheng 252000, China
| | - P J Wang
- Departmen of Neurosurgery, Liaocheng Brain Hospital, Liaocheng 252000, China
| | - M Zhang
- Departmen of Neurosurgery, Liaocheng Brain Hospital, Liaocheng 252000, China
| | - Q L Jiang
- Departmen of Neurosurgery, Liaocheng Brain Hospital, Liaocheng 252000, China
| | - C Liu
- Departmen of Neurosurgery, Liaocheng Brain Hospital, Liaocheng 252000, China
| | - J Y Wang
- Departmen of Neurosurgery, Liaocheng Brain Hospital, Liaocheng 252000, China
| | - L Y Zhang
- Departmen of Neurosurgery, Liaocheng Brain Hospital, Liaocheng 252000, China
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Wang W, Shao ZH, Huang XH, Xu Y, Feng X, Wang PJ. [Effects of dynamic contrast enhancement on diffusion weighted imaging score of 3 in prostate imaging reporting and data system version 2 of peripheral zone]. Zhonghua Yi Xue Za Zhi 2020; 100:1002-1006. [PMID: 32294857 DOI: 10.3760/cma.j.cn112137-20190816-01820] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effects and value of dynamic contrast-enhanced (DCE) on diffusion-weighted imaging (DWI) score 3 in the prostate imaging data and reporting system version 2(PI-RADS V2)of peripheral zone. Methods: A retrospective study of consecutive 204 cases of prostate disease in peripheral zone was conducted from January 2015 to January 2018, including 169 cases of prostate cancer and 35 cases of non-prostate cancer. All cases were examined multi-parametric MR imaging on a 3-T MR scanner and confirmed by pathology. Images were analyzed according to PI-RADS V2.Inter-reader agreement of scores was evaluated by kappa coefficient. The constituent ratio of clinically significant prostate cancer (csPCa) in PI-RADS V2 overall scores 3, 3+1 and 4 were calculated and analyzed by non-parametric Chi-square test to determine whether the difference in composition ratio was significant. The positive rate of DCE in diffusion weighted imaging (DWI) score 3 and 4 were calculated. Results: There were 68.6%(140/204) cases in 204 patients with peripheral prostate disease who scored PI-RADS V2 overall score of 3,3+1 and 4. Kappa value was higher for the PI-RADS V2 overallscore of 4 than 3 or 3+1 in the PZ (k values of 0.802 vs 0.737 or 0.591, respectively; all P<0.01). The constituent ratio of csPCa in PI-RADS V2 overallscore of 3, 3+1 and 4 were 16.7%(3/18),43.2%(19/44),78.2%(61/78), the difference of which was significant (χ(2)=29.839, P<0.05).There was also a significant difference between the constituent ratio of csPCa in the score of 3+1 and 4 (χ(2)=15.286, P<0.01).The positive rate of DCE in cases of PI-RADS V2 overall score 3,3+1 and 4 was 76.4%(107/140).The positive rate of DCE incases of DWI score 3 and 4 were 71.0%(44/62), 80.8%(63/78),respectively. Conclusion: DCE has a certain value in PI-RADS V2 due to its high positive rate in the detection of prostate cancer in peripheral zone.DCE is helpful to DWI score 3 to improve the detection rate of csPCa.The PI-RADS V2 overall score 3+1 and 4 in the peripheral zone maybe need to be distinguished due to the different detection of csPCa.
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Affiliation(s)
- W Wang
- Department of Medical Imaging, Tongji Hospital, Tongji University, Shanghai 200065, China
| | - Z H Shao
- Department of Radiology, Shibei Hospital, Jing'an District, Shanghai 200435, China
| | - X H Huang
- Department of Medical Imaging, Tongji Hospital, Tongji University, Shanghai 200065, China
| | - Y Xu
- Department of Medical Imaging, Tongji Hospital, Tongji University, Shanghai 200065, China
| | - X Feng
- Department of Radiology, Shibei Hospital, Jing'an District, Shanghai 200435, China
| | - P J Wang
- Department of Medical Imaging, Tongji Hospital, Tongji University, Shanghai 200065, China
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Fu QS, Chen XH, Chakrabarti C, Li CL, Zheng J, Wang PJ, Yin HX, Qiu Y, Meng B, Yuan SL. Negative magnetization, complex magnetic ordering and applications of Cr-doped Co 2TiO 4. Phys Chem Chem Phys 2020; 22:7058-7064. [PMID: 32196030 DOI: 10.1039/c9cp06444c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polycrystalline Co2Ti1-xCrxO4 (0 ≤ x ≤ 0.2) inverse spinel ceramics have been synthesized via a sol-gel technique. The dc magnetization measurement in the field-cooled mode shows that negative magnetization could be observed until x reaches 0.2. The exchange constants are calculated using the ferrimagnetic Curie-Weiss fitting and the mean-field theory. This reveals that the strength of the inter sublattice magnetic interaction presents a non-monotonic trend with the increase in Cr content and reaches the minimum at x = 0.1, giving rise to the highest compensation temperature in the x = 0.1 sample. The applicability of the x = 0.1 sample is investigated in light of two prominent magnetic effects: (i) the stable magnetic switching effect indicates the potential applications in magnetic switching and data storage and (ii) the coexistence of normal and inverse magnetocaloric effects suggests a potential application in a constant temperature bath at 54 K.
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Affiliation(s)
- Q S Fu
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
| | - X H Chen
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
| | - C Chakrabarti
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
| | - C L Li
- School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, People's Republic of China
| | - J Zheng
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
| | - P J Wang
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
| | - H X Yin
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
| | - Y Qiu
- School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, People's Republic of China
| | - B Meng
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
| | - S L Yuan
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
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Xu XW, Wang PJ. [Pay attention to the research of artificial intelligence in central nervous system imaging]. Zhonghua Yi Xue Za Zhi 2020; 100:161-164. [PMID: 32008279 DOI: 10.3760/cma.j.issn.0376-2491.2020.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- X W Xu
- Department of Medical Imaging, Tongji Hospital of Tongji University, Shanghai 200065, China
| | - P J Wang
- Department of Medical Imaging, Tongji Hospital of Tongji University, Shanghai 200065, China
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11
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Meng L, Wang PJ, Yang L, Shen Y. [Repair of oroantral fistula via anterior lacrimal recess approach]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2019; 33:887-888. [PMID: 31446711 DOI: 10.13201/j.issn.1001-1781.2019.09.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Indexed: 11/12/2022]
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12
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Liang YB, Wu HX, Liao N, Li M, Zhang Q, Wang PJ, Zheng JW, Fang AW, Qu J. [Changing trends of topical anti-glaucoma medications in the Eye Hospital of Wenzhou Medical University during the past ten years]. Zhonghua Yan Ke Za Zhi 2019; 54:520-525. [PMID: 29996614 DOI: 10.3760/cma.j.issn.0412-4081.2018.07.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the changing trends of topical anti-glaucoma medications in the outpatient of the Eye Hospital of Wenzhou Medical University over the decade 2005-2014. Methods: Retrospective case series study. The medications data of glaucoma outpatients in the Eye Hospital of Wenzhou Medical University were collected for the period of January 1(st) 2005 to December 31(st) 2014. SPSS 20.0 statistical software was used, mainly for statistical description of the data. The main outcome measures were the proportions of the prescriptions of different medications, and the proportions of the monotherapy and combination therapies. Results: During the 10 years, the number of glaucoma outpatients increased year by year, from 994 in 2005 to 3 266 in 2014, the gender ration was close to 1∶1, and the age were (57±18) years. The proportion of β-blockers decreased from 56.7% (750/1 323) in 2005 to 33.1% (2 120/6 407) in 2014. The proportion of cholinergic agents decreased from 17.2% (227/1 323) in 2005 to 10.3% (663/6 407) in 2014. While the proportion of prostaglandins increased from 13.3% (176/1 323) in 2005 to 36.8% (1 916/5 209) in 2011, which was close to the 37.9% (1 972/5 209) of β-blockers in 2011. In 2012, the prostaglandins proportion increased to 41.9% (2 435/5 810) exceeding the 37.2% (2 161/5 810) of β-blockers, and became the most prescribed medication. The proportion of prostaglandins continued to increase to 46.9% (3 008/6 407) in 2014. The proportion of α(2)-agonists increased from 17.0% (225/1 323) in 2005 to 22.8% (1 460/6 407) in 2014. The proportion of carbonic anhydrase inhibitors increased from 9.6% (127/1 323) in 2005 to 24.1% (1 546/6 407) in 2014.The proportion of monotherapy decreased from 78.0% (1 032/1 323) in 2005 to 58.6% (3 757/6 407) in 2014. The proportion of two drugs combination increased from 20.0% (264/1 323) in 2005 to 26.7% (1 709/6 407) in 2014. The proportion of three drugs combination increased from 2.0% (26/1 323) in 2005 to 12.3% (788/6 407) in 2014. The proportion of four drugs combination increased from 0.1% (1/1 323) in 2005 to 2.3% (150/6 407) in 2014. Conclusions: The changes of the proportions of topical anti-glaucoma medications were remarkable from 2005 to 2014 in the outpatient of the Eye Hospital of Wenzhou Medical University. The β-blockers and cholinergic agents were declining, while the prostaglandins, α(2)-agonists and carbonic anhydrase inhibitors were increasing, and the prostaglandins became the most prescribed medication since 2012. The proportion of combination therapy was increasing. (Chin J Ophthalmol, 2018, 54: 520-525).
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Affiliation(s)
- Y B Liang
- The Eye Hospital of Wenzhou Medical University, Wenzhou 325000, China
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13
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Swerdlow M, Tamboli M, Alhusseini MI, Moosvi N, Rogers AJ, Leef G, Wang PJ, Rillig A, Brachmann J, Sauer WH, Ruppersberg P, Narayan SM, Baykaner T. Comparing phase and electrographic flow mapping for persistent atrial fibrillation. Pacing Clin Electrophysiol 2019; 42:499-507. [PMID: 30882924 DOI: 10.1111/pace.13649] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 01/17/2019] [Accepted: 02/04/2019] [Indexed: 12/21/2022]
Abstract
BACKGROUND An increasing number of methods are being used to map atrial fibrillation (AF), yet the sensitivity of identifying potential localized AF sources of these novel methods are unclear. Here, we report a comparison of two approaches to map AF based upon (1) electrographic flow mapping and (2) phase mapping in a multicenter registry of patients in whom ablation terminated persistent AF. METHODS Fifty-three consecutive patients with persistent AF in whom ablation terminated AF in an international multicenter registry were enrolled. Electrographic flow mapping (EGF) and phase mapping were applied to the multipolar simultaneous electrograms recorded from a 64-pole basket catheter in the chamber (left vs right atrium) where AF termination occurred. We analyzed if the mapping methods were able to detect localized sources at the AF termination site. We also analyzed global results of mapping AF for each method, patterns of activation of localized sources. RESULTS Patients were 64.3 ± 9.4 years old and 69.8% were male. EGF and phase mapping identified localized sources at AF termination sites in 81% and 83% of the patients, respectively. Methods were complementary and in only n = 2 (3.7%) neither method identified a source. Globally, EGF identified more localized sources than phase mapping (5.3 ± 2.8 vs 1.8 ± 0.5, P < 0.001), with a higher prevalence of focal (compared to rotational) activation pattern (49% vs 2%, P < 0.01). CONCLUSIONS EGF is a novel vectorial-based AF mapping method, which can detect sites of AF termination, agreeing with, and complementary to, an alternative AF mapping method using phase analysis.
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Affiliation(s)
- M Swerdlow
- Cardiovascular Medicine, Stanford University, Stanford, California
| | - M Tamboli
- Cardiovascular Medicine, Stanford University, Stanford, California
| | - M I Alhusseini
- Cardiovascular Medicine, Stanford University, Stanford, California
| | - N Moosvi
- Cardiovascular Medicine, Stanford University, Stanford, California
| | - A J Rogers
- Cardiovascular Medicine, Stanford University, Stanford, California
| | - G Leef
- Cardiovascular Medicine, Stanford University, Stanford, California
| | - P J Wang
- Cardiovascular Medicine, Stanford University, Stanford, California
| | - A Rillig
- Cardiology, Asklepios Klinik St. Georg, Hamburg, Germany
| | - J Brachmann
- Cardiology, II Medizinische Klinik Klinikum Coburg, Coburg, Germany
| | - W H Sauer
- Cardiology, University of Colorado at Denver and Health Sciences Center, Denver, Colorado
| | | | - S M Narayan
- Cardiovascular Medicine, Stanford University, Stanford, California
| | - T Baykaner
- Cardiovascular Medicine, Stanford University, Stanford, California
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14
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Luo Y, Xue HW, Wang PJ. [The imaging study and progress of liver fibrosis should be emphasized]. Zhonghua Yi Xue Za Zhi 2019; 99:481-483. [PMID: 30786343 DOI: 10.3760/cma.j.issn.0376-2491.2019.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Affiliation(s)
- Y Luo
- Department of Medical Imaging, Tongji Hospital of Tongji University, Shanghai 200065, China
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15
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Zheng B, Wang PJ, Xue LY, Liu XY, Guo L, Ying JM. [Combination of environmental friendly reagent and ultrasonic assisted rapid processing for protein and molecular detection in tumor biopsy specimens]. Zhonghua Bing Li Xue Za Zhi 2019; 48:116-119. [PMID: 30695863 DOI: 10.3760/cma.j.issn.0529-5807.2019.02.008] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the impact of ultrasonic assisted rapid processing technique combined with the environment friendly reagent (which can be utilized in fixing,dehydrating and clearing) on processing tumor biopsy specimens and the subsequent target detection. Methods: Postoperative tissue samples of 56 cases of breast cancer, colorectal cancer, lung cancer, stomach cancer, liver mass, bladder mass, uterus mass were obtained at the National Cancer Center, Cancer Hospital, Chinese Academy of Medical Sciences from February to April, 2017. Three specimens ranging in size from 1 to 3 mm were collected from each sample, and were separated into control group (traditional tissue-processing method); experiment group 1 (3.7% neutral buffered formaldehyde fixation, composite environment friendly reagent and ultrasonic assisted rapid processing) and experimental group 2 (composite environment friendly reagent direct fixation, higher temperature and longer time for tissue processing). Two pathologists blinded to the experimental groups scored totally the nuclear, cytoplasmic, and membrane staining of 43 cases of immunohistochemistry (IHC), four HER2 fluorescence in situ hybridization (FISH), 20 extracted DNA quality and four EGFR gene mutation detection in lung adenocarcinoma; the results were compared with the control group. Results: There was no difference in the IHC staining, HER2 FISH, the DNA quality, and EGFR genetic results between experimental group 1 and control group. For experiment group 2, comparing results of IHC staining, HER2 FISH and the quality of DNA, there was no obvious difference from control group and experiment group 1, but might show an increase in the background of IHC staining. The difference between the treatment temperature and time in the experimental group 2 did not affect the results of the gene mutation detection. Conclusions: Environment freindly reagent and ultrasonic assisted rapid processing equipment could be used for rapid processing and diagnosis for tumor biopsies. Using complex environment-friendly reagents supplement fixation, higher treatment temperature and longer treatment time do not significantly affect the IHC, FISH and molecular detection accuracy.
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Affiliation(s)
- B Zheng
- Department of Pathology, National Cancer Center, Cancer Hospital, Chinese Academy of Medical Sciences, Beijing 100021, China
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16
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Yu T, Yu SL, Deng XF, Wang PJ, Luo RT, Cai HSL, Wang B, Zhang D, Wang S, Zhao JZ, Zhang Y. [Functional lateralization of major Chinese language cortex for presurgical evaluation in neurosurgery]. Zhonghua Yi Xue Za Zhi 2019; 99:329-332. [PMID: 30772971 DOI: 10.3760/cma.j.issn.0376-2491.2019.05.002] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the functional lateralization of major Chinese language cortex in patients with cerebral arteriovenous malformation (AVM) in dominant hemispheric via functional magnetic resonance imaging (fMRI). Methods: Nine right-handed normal volunteers and fourteen patients with cerebral AVM in dominant hemisphere diagnosed in Beijing Tiantan Hospital between December 2017 and June 2018 were included. Three language tasks (semantic judgment, word reading, and listening comprehension) were applied to activate language areas. Lateralization index (LI) was used to show the dominant hemisphere. Results: In the control group, right-sided lateralization of BOLD signal activations was observed in 0/27 (0%) of the language tasks. While in the AVM patients, right-sided lateralization of BOLD signal activations was observed in 8/42 (19%) language tasks. The difference was statistically significant (χ(2)=5.73, P=0.019). Conclusions: The dominant hemisphere of different language tasks may be different in patients with cerebral lesions. Compared with normal controls, patients with cerebral AVM in dominant hemispheric are more likely to have right-sided lateralization of language cortex.
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Affiliation(s)
- T Yu
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - S L Yu
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - X F Deng
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - P J Wang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - R T Luo
- Department of Neurosurgery, Beijing Children's Hospital, Beijing 100045, China
| | - H S L Cai
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - B Wang
- Beijing MRI Center for Brain Research, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - D Zhang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - S Wang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - J Z Zhao
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - Y Zhang
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
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Zeng JQ, Wu JQ, Li MH, Wang PJ. [ In vitro early detection of amyloid plaques in Alzheimer's disease by Pittsburgh compound B-modified magnetic nanoparticles]. Zhonghua Yi Xue Za Zhi 2018; 97:3258-3262. [PMID: 29141366 DOI: 10.3760/cma.j.issn.0376-2491.2017.41.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To construct magnetic nanoparticles targeting β-amyloid (Aβ) plaques, the pathological biomarker of Alzheimer's disease (AD) and to study their binding capability in vitro. Methods: Superparamagnetic nanoparticles Mn(0.6)Zn(0.4)Fe(2)O(4) (MZF) were coated with amphiphilic star-block copolymeric micelles and modified with Aβ-specific probe Pittsburgh compound B (PiB) to construct a novel magnetic nanoparticle MZF-PiB, which specifically targeted amyloid plaques. Transmission electron microscope was used to study the morphological features of MZF-PiB. Superparamagnetism of MZF-PiB was assessed by its r(2) relaxation rate by using 3.0 T MRI scanner. Cytotoxic test was applied to determine biosafety of MZF-PiB nanoparticles in differentiated human neuroblastoma cells (SH-SY5Y) and Madin-Darby canine kidney (MDCK). In vitro binding tests were conducted via immunohistochemistry on 6-month old AD mice brain sections. Differences of cell viability between groups were compared with one-way analysis of variance. Results: MZF-PiB nanoparticles were successfully constructed. Transmission electron microscope images showed that the nanoparticles were about 100 nm in size. The r(2) relaxation rate was 163.11 mMS(-1). No differences were found in cell viability of SH-SY5Y and MDCK incubated with MZF-PiB suspension for 24 h or 48 h when compared with those of untreated cells (F=2.336, 2.539, 0.293, 1.493, all P>0.05). In vitro binding tests indicated that the MZF-PiB were specifically bound to amyloid plaques. The smallest size of detected plaques was 27 μm. Conclusion: PiB-modified nanoparticles targeting Aβ are biologically safe and highly superparamagnetic, possessing the capability to detect amyloid plaques early in vitro and the potential for early diagnosis of AD.
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Affiliation(s)
- J Q Zeng
- Department of Radiology, Tongji Hospital of Tongji University, Shanghai 200065, China
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18
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Zhang XW, Lin T, Zhang P, Song HC, Jin H, Xu J, Xu J, Wang PJ, Niu KY, Chen KJ. Tunable quantum dot arrays as efficient sensitizers for enhanced near-infrared electroluminescence of erbium ions. Nanoscale 2018; 10:4138-4146. [PMID: 29436557 DOI: 10.1039/c7nr08820e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Under electrical pumping conditions, high-efficiency Si-based near-infrared light generation and amplification on a chip have long been pursued for future optical interconnection technology. However, the overall performance of Si-based near-infrared electroluminescence (EL) devices, including the overall efficiency, turn-on voltage and stability under operational conditions, can rarely meet the requirements of monolithic optoelectronic integration. In this work, we designed a confined crystallization growth strategy for fabricating metal oxide quantum dot (QD) arrays embedded in Si-based films as sensitizers of Er3+ ions. Through the precise control of particle size and number density of QD sensitizers, the near-infrared photoluminescence (PL) emission of Er3+ ions can be enhanced by more than three orders of magnitude. More significantly, such hierarchical control over the regular arrangement of QD arrays not only considerably enhances the resonance energy transfer efficiency, but also offers an effective conduction path for carrier transport. Therefore, the corresponding near-infrared EL device exhibits a decreased turn-on voltage of 4.5 V, a high external quantum efficiency of 0.7%, and a long operational lifetime of more than 1000 hours, making this device superior to most Si-based on-chip near-infrared EL devices. This well-controlled metal oxide QD array represents an ideal sensitizer to effectively promote the EL emission of rare earth ions and reduce the turn-on voltage. Meanwhile, the analysis of the carrier transport mechanism paves the way for future research into resonance energy transfer under electrical pumping conditions.
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Affiliation(s)
- X W Zhang
- Department of Electrical Engineering and Computer Science, Ningbo University, Ningbo, 315211, P. R. China.
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Wang W, Shao ZH, Zeng JQ, Wu DL, Wang GL, Wang PJ. [Effects of different computed high b-values on diffusion weighted imaging scores in Prostate Imaging Reporting and Data System version 2 of prostate cancer in peripheral zone]. Zhonghua Yi Xue Za Zhi 2017; 97:3401-3405. [PMID: 29179281 DOI: 10.3760/cma.j.issn.0376-2491.2017.43.009] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To determine the effects of different computed high b-value on diffusion weighted imaging (DWI) scores in Prostate Imaging Reporting and Data System version 2 (PI-RADS v2) of prostate cancer in peripheral zone. Methods: A retrospective study of 104 cases of prostate cancer in peripheral zone was conducted, all of the patients were histopathologically confirmed by transrectal ultrasound guided saturation biopsy or radical prostatectomy in Tongji Hospital of Tongji University from January 2012 to December 2015.All MRI imaging examinations were performed by using a 3.0T Siemens Verio MRI scanner.The imaging protocol consisted of high-resolution axial and sagittal T(2) weighted imaging (T(2)WI), axial acquired diffusion weighted imaging (aDWI) with b=0, 50, 1 000 s/mm(2) and dynamic contrast-enhanced (DCE) scans.Computed diffusion weighted imaging (cDWI) images with b=1 000, 1 400, 2 000 s/mm(2) were processed by Matlab.These three groups of cDWI images were analyzed according to the PI-RADS v2 criteria, and signal intensity of ratio (SIR) of lesions were analyzed by independent t test and one-way ANOVA in each group. Results: The numbers of cases with a DWI score of 2 and 5 were similar among three groups.Nine cases (33.3%) in all 27 cases with a DWI score of 3 on b=1 000 s/mm(2) upgraded to score 4 when b-value rose to 1 400 and 2 000 s/mm(2).The ratios of SIR of lesions in cases upgraded from DWI score 3 to 4 to those unchanged cases on b=1 400 and 2 000 s/mm(2) were 1.86±0.21 to 1.61±0.27 and 2.18±0.26 to 1.75±0.30, respectively (t=2.486, t=3.671, both P<0.05). In these 9 cases who upgraded to DWI score 4, SIRs of the lesion were significantly different between groups when b=1 000, 1 400 and 2 000 s/mm(2) (F=10.907, 33.768, 8.043, all P<0.05), and their SIRs increased with the rising of b-value. Conclusions: The computed high b-value (b≥1 400 s/mm(2)) mainly affects cases with a DWI score of 3, but DWI scores would not change neither in b=1 400 s/mm(2) nor in 2 000 s/mm(2) cases. For DWI score in PI-RADS v2 of prostate cancer in peripheral zone, b=1 400 s/mm(2) is probably of more scoring value than b=1 000 or 2 000 s/mm(2).
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Affiliation(s)
- W Wang
- Department of Medical Imaging, Tongji Hospital, Tongji University, Shanghai 200065, China
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Chen SQ, Huang M, Liu CL, Shen YY, Cai Q, Wang PJ. [Differentiation of induced pluripotent stem cells into neural stem cells induced by brain-derived neurotrophic factor via Wnt/β-catenin and extracellular signal-regulated kinase/mitogen-activated protein kinases signal pathway]. Zhonghua Yi Xue Za Zhi 2017; 97:3263-3268. [PMID: 29141367 DOI: 10.3760/cma.j.issn.0376-2491.2017.41.014] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the mechanism of brain-derived neurotrophic factor (BDNF) promoting induced pluripotent stem cells (iPSCs) to differentiate into neural stem cells (NSCs) via Wnt/β-catenin and extracellular signal-regulated kinase/mitogen-activated protein kinases (ERK/MAPK) signal pathways. Methods: iPSCs were cultured and identified. The iPSCs were induced to differentiate into NSCs by BDNF and retinoic acid (RA). Nestin was detected by immunofluorescence and flow cytometry after iPSCs differentiated. The technique of small interfering RNA (siRNA) was used to silence the gene expression of β-catenin and ERK, and iPSCs were divided into control group, BDNF group (adding 10 μg/L BDNF), siRNA-ERK/BDNF group (transfected with siRNA-ERK and adding 10 μg/L BDNF) and siRNA-β-catenin/BDNF group (transfected with siRNA-β-catenin and adding 10 μg/L BDNF). Real-time polymerase chain reaction (RT-PCR) and Western blotting were used to detect the mRNA and protein expression of key elements of Wnt/β-catenin and ERK/MAPK signaling pathways, included β-catenin, ERK1/2, c-fos, c-jun, and c-myc. The least significant difference test was used when data were compared between groups. Results: The immunofluorescence showed that iPSCs expressed octamer-binding transcription factor-4 (Oct4), SRY-related HMG box protein-2 (Sox2) and Nanog genes. The flow cytometry showed that Nestin-positive cells were 78.7% for BDNF and 43.5% for RA, and it was only 7.8% for routine medium. Compared with those in the control group, the mRNA expression of β-catenin, ERK1/2, c-fos, c-jun, and c-myc in the BDNF group were upregulated significantly (t=2.80, 2.318, 2.255, 1.799, 1.582, 1.663, all P<0.05), and the same results were acquired with the protein expression (t=2.805, 2.318, 2.255, 1.799, 1.582, 1.663, all P<0.050). Compared with those in BDNF group, the mRNA and protein expression of ERK1/2 in siRNA-ERK/BDNF group down-regulated obviously (t=1.917, 2.042, 1.673, 1.540, all P<0.05), and the mRNA and protein expression of c-fos and c-jun were down-regulated (t=1.022, 0.907, 0.848, 0.801, all P<0.05). However, the mRNA and protein expression of β-catenin and c-myc were not suppressed by siRNA-ERK (t=0.216, 0.185, 0.097, 0.112, all P>0.05). In siRNA-β-catenin/BDNF group, the mRNA and protein expression of β-catenin and c-myc was obviously down-regulated when compared with those in BDNF group (t=3.104, 2.774, 2.235, 1.911, all P<0.05), and expression of ERK1/2, c-fos and c-jun were down-regulated too (t=0.776-1.192, all P<0.05). Conclusion: BDNF promotes the differentiation of iPSCs by activating Wnt/β-catenin and ERK/MAPK signal pathway, there should be cross-talk between the two signal pathways, and c-fos and c-jun may be common nuclear transcription factors.
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Affiliation(s)
- S Q Chen
- Neuroimaging Research Center, the Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou 215001, China
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Han J, Li Y, Wang PJ, Shi CL, Ding B, Wang L. [Blastic plasmacytoid dentritic cell neoplasm with myeloproliferative neoplasms:a case report]. Zhonghua Xue Ye Xue Za Zhi 2017; 38:256. [PMID: 28395455 PMCID: PMC7348372 DOI: 10.3760/cma.j.issn.0253-2727.2017.03.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
| | | | | | | | | | - L Wang
- Qingdao center medical group, Qingdao 266042, China
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Yang AQ, Wang PJ, Huang T, Zhou WL, Landman J. Effects of monomethoxypolyethylene glycol-chitosan nanoparticle-mediated dual silencing of livin and survivin genes in prostate cancer PC-3M cells. Genet Mol Res 2016; 15:gmr7430. [PMID: 27173182 DOI: 10.4238/gmr.15027430] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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
Monomethoxypolyethylene glycol-chitosan (mPEG-CS) nanoparticles were used as interfering RNA carriers to transfect human prostate cancer PC-3M cells to evaluate the effects of livin and survivin gene silencing on the proliferation and apoptosis. mPEG-CS nanoparticles with sizes of approximately 60 nm were first synthesized by ionic crosslinking. Through electrostatic adsorption, mPEG-CS-livin short hairpin RNA (shRNA), mPEG-CS-survivin shRNA, and mPEG-CS-(livin shRNA + survivin shRNA) nanoparticles were then prepared to transfect PC-3M cells. The mRNA and protein expression levels of livin and survivin were measured by reverse transcription-PCR and western blotting, respectively. The inhibitory effects of down-regulated livin and survivin gene expression on the cell proliferation were evaluated by MTT assay. Cell apoptosis was assessed visually using Hoechst staining. Livin and survivin expression levels in all shRNA interference groups were effectively down-regulated at both the mRNA and protein levels. Dual silencing of livin and survivin genes markedly inhibited cell proliferation and facilitated apoptosis, with better outcomes than those of individual shRNA treatments. mPEG-CS nanoparticle-mediated dual shRNA interference of livin and survivin genes significantly reduced the expression levels in PC-3M cells, inhibited proliferation, and promoted apoptosis. As these effects were superior to single interference, this method may have synergistic effects.
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Affiliation(s)
- A Q Yang
- Department of Urology, Ruijin Hospital Luwan Branch of Jiaotong University, Shanghai, China
| | - P J Wang
- Department of Urology, Ruijin Hospital Luwan Branch of Jiaotong University, Shanghai, China
| | - T Huang
- Department of Urology, Ruijin Hospital Luwan Branch of Jiaotong University, Shanghai, China
| | - W L Zhou
- Department of Urology, Ruijin Hospital Luwan Branch of Jiaotong University, Shanghai, China
| | - J Landman
- Department of Urology, UCI Medical Center, Orange, CA, USA
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Affiliation(s)
- B Jiang
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, PR China
| | - P J Wang
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, PR China
| | - J J Zhao
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu, PR China
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Dang SC, Feng S, Wang PJ, Cui L, Qu JG, Zhang JX. Overexpression of Survivin mutant Thr34Ala induces apoptosis and inhibits gastric cancer growth. Neoplasma 2015; 62:81-7. [DOI: 10.4149/neo_2015_010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Cui N, Wen PC, Liang Q, Liu HN, Zhang WB, Wang PJ, Guo HY, Ren FZ. Chemical composition of yak colostrum and transient milk. J Anim Physiol Anim Nutr (Berl) 2014; 99:825-33. [PMID: 25545664 DOI: 10.1111/jpn.12282] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 11/20/2014] [Indexed: 11/30/2022]
Abstract
The objective of this study was to assess the changes in the chemical composition of yak colostrum and transient milk. Samples were collected from 12 yaks on days 1, 2, 3, 4, 5, 6 and 7 post-partum (PP). The gross composition, nitrogen fraction distribution, amino acid (AA) profile and fatty acid (FA) profile were analysed. All the components decreased rapidly during the first 3 days except lactose which increased. The ratio of whey protein to casein protein decreased from 46:54 to 17:83 during the first 7 days PP. The content of all the AAs decreased, while the percentages of eight essential AAs in protein of samples increased during the study period. Monounsaturated FAs and polyunsaturated FAs decreased in the first 7 days PP, whereas saturated FAs increased. In conclusion, the changes in chemical composition were remarkable during the first 3 days. The slight variations, happened during the transient period, are not negligible, which also should be taken into account in the development of yak colostrum supplements.
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Affiliation(s)
- N Cui
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, China
| | - P C Wen
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, China
| | - Q Liang
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, China
| | - H N Liu
- College of Life Science and Engineering, Northwest University for Nationalities, Lanzhou, China
| | - W B Zhang
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, China
| | - P J Wang
- Key Laboratory of Functional Dairy, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - H Y Guo
- Key Laboratory of Functional Dairy, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.,Beijing key laboratory of Nutrition, Health & Food Safety, Beijing, China
| | - F Z Ren
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, China.,Key Laboratory of Functional Dairy, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
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Lv XJ, Sun JW, Hu B, Ouyang M, Fu ZY, Wang PJ, Bian GF, Zhang C. Effective process to achieve enhanced electrochromic performances based on poly(4,4',4″-tris[4-(2-bithienyl)pheny]amine)/ZnO nanorod composites. Nanotechnology 2013; 24:265705. [PMID: 23735932 DOI: 10.1088/0957-4484/24/26/265705] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Poly(4,4',4″-tris[4-(2-bithienyl)pheny]amine) (PTBTPA) was electrochemically synthesized on a ZnO-coated ITO electrode to form a PTBTPA/ZnO nanocomposite electrode. The composite film exhibited a noticeable electrochromism, with reversible color changes from orange in the reduced state (0 V), olive green in the middle state (0.9 V) to dark gray in the oxidized state (1.2 V). Furthermore, the composite film showed a fast switching time of 0.92 s and a high optical contrast of 65% at 1100 nm, and retained 97% of its original electroactivity after 500 cycles, while PTBTPA film had switching time of 1.63 s and an optical contrast of 52% at 1100 nm, and retained 75% of its original electroactivity. The results demonstrated that the electrochromic performances were significantly enhanced through incorporating PTBTPA with ZnO nanorods. ZnO nanorods were introduced to modify the structure of the electrode: on one hand, to offer a directional attraction for the counterions, and on the other hand, to enhance the adhesion between the polymer and the ITO electrode. Accordingly, a conducting polymer/inorganic nanocomposite system could improve the polymer's electrochromic performance, especially in terms of the switching speed and long-term stability of the electrochromic materials.
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Affiliation(s)
- X J Lv
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou, People's Republic of China
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Zhang W, Wang PJ, Li MH, Gao XL, Gu GJ, Shao ZH. 1H-MRS can monitor metabolites changes of lateral intraventricular BDNF infusion into a mouse model of Alzheimer's disease in vivo. Neuroscience 2013; 245:40-9. [PMID: 23608100 DOI: 10.1016/j.neuroscience.2013.04.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Revised: 04/02/2013] [Accepted: 04/03/2013] [Indexed: 11/16/2022]
Abstract
Proton magnetic resonance spectroscopy (1H-MRS) can provide noninvasive detection of brain metabolite changes in vivo in Alzheimer's disease (AD). AD is a prevalent neurodegenerative disorder characterized by deposition of β-amyloid peptides (Aβ) in multiple brain regions. Brain-derived neurotrophic factor (BDNF) is a neurotrophic factor whose level has been shown to be decreased in AD. BDNF supplementation can offer improvement in AD. However, the means of evaluation are still relatively limited. In the present study, 1H-MRS was applied to evaluate the therapeutic effects of bilateral intraventricular BDNF infusion into APP+PS1 (amyloid precursor protein+presenilin 1) transgenic mice. For comparison to the 1H-MRS changes in the prefrontal cortex, Morris water maze (MWM) test, Fluoro-Jade B staining and immunofluorescence for Aβ, glial fibrillary acidic protein and tropomyosin-related kinase B (TrkB) were also performed. Our results showed that N-acetylaspartate (NAA) levels increased and myo-inositol levels decreased in Tg-BDNF mice compared with Tg-PBS mice. But NAA level in Tg-BDNF mice was still lower than that in wild-type mice at 6weeks after infusion. These changes correlated with increased immunoreactivity of TrkB, reduced compact Aβ peptide and FJB+ neurons in Tg-BDNF mice compared to Tg-PBS mice. However, Tg-BDNF mice did not present obvious changes in behavior in the MWM. Taken together, we suggest that 1H-MRS may be a sensitive means of evaluating metabolic changes in response to therapeutic strategies in AD. Moreover, BDNF, may be a viable means of offering trophic support during disease.
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Affiliation(s)
- W Zhang
- Department of Radiology, Tongji Hospital, Medical School of Tongji University, Shanghai, China
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28
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Costeas XF, Link MS, Foote CB, Homoud MK, Wang PJ, Estes NA. Predictors of ventricular tachycardia recurrence in 100 patients receiving tiered therapy defibrillators. Clin Cardiol 2009; 23:852-6. [PMID: 11097134 PMCID: PMC6655218 DOI: 10.1002/clc.4960231113] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND AND HYPOTHESIS Programmed electrical stimulation (PES) is a time-honored diagnostic tool in patients with ventricular tachyarrhythmias. The response to PES can be used to assess efficacy of pharmacologic or electrical therapy, as well as to obtain prognostic information. Reproducible induction of ventricular tachycardia with invasive electrophysiologic testing, or stimulation through defibrillator lead systems, can help optimize antiarrhythmic drug therapy and device programming during clinical follow-up. METHODS We present our experience with 100 patients who had inducible sustained monomorphic ventricular tachycardia (SMVT) during invasive PES at baseline, and received a third-generation implantable cardioverter-defibrillator (ICD) alone, or in combination with antiarrhythmic drug therapy. Noninvasive programmed stimulation (NIPS) was performed prior to hospital discharge in 61 patients. RESULTS The inducibility of SMVT was concordant between the invasive study and NIPS in a subgroup of 40 (82%) patients who had invasive PES on the same drug regimen. During a mean follow-up of 16 months, there were 12 nonarrhythmic deaths and recurrence of spontaneous SMVT in 36 (40%) of the surviving patients. Using a Cox proportional hazards model, the following variables were associated with early arrhythmia recurrence: persistent inducibility of SMVT during the NIPS session (relative risk 11, range 2.6-47); induction of SMVT with a cycle length > 280 ms during invasive baseline PES (2.5, 1.2-5) and presence of prior inferior myocardial infarction (2.1, 1-4.2). Timing to initial recurrence of spontaneous tachycardia was unaffected by other clinical variables or concomitant antiarrhythmic drug use. CONCLUSION Programmed electrical stimulation techniques offer insight into the patterns of spontaneous ventricular tachycardia recurrence and have significant practical utility in the management of patients receiving third-generation ICDs.
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Affiliation(s)
- X F Costeas
- Cardiac Arrhythmia Service, Division of Cardiology, New England Medical Center, Boston, Massachusetts, USA
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29
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Wang PJ, Li YD, Xia JH, Liu CS. Characterization of reflection intermittency in a composite granular chain. Phys Rev E Stat Nonlin Soft Matter Phys 2008; 77:060301. [PMID: 18643202 DOI: 10.1103/physreve.77.060301] [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: 12/02/2007] [Indexed: 05/26/2023]
Abstract
The physical factors controlling the power-law behavior of impact energy in a composite granular chain remain elusive. Based on event-driven simulations and the on-off intermittency of wave reflections, we obtain the probability distribution functions of the waiting time tau and the energy leakage DeltaE . They exhibit lognormal distributions, which together with the relationship between DeltaE and tau allow one to explain directly the power-law behavior of the confined energy. This work may be extended to higher dimensions and help us understand the complex dynamics in granular materials.
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Affiliation(s)
- P J Wang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, PO Box 1129, Hefei, People's Republic of China
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30
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Abstract
During the first meiotic cell division (meiosis I), homologous chromosomes pair, synapse, recombine, and segregate, using highly coordinated and tightly regulated mechanisms. The synaptonemal complex (SC), a proteinaceous tripartite structure, plays an important role both as a scaffold for the close juxtaposition of homologous chromosomes and in regulating the overall process of homologous recombination. Specifically, it mediates chromosome synapsis during the lengthy prophase of meiosis I. The SC consists of two parallel lateral elements, one central element, and numerous transverse filaments. Recent genetic studies in mice have provided novel insights into the mechanisms by which the SC regulates meiosis and into the etiology of diseases such as aneuploidy. Even though the tripartite ultrastructure and meiotic functions of the SC are similar in different species, the SC components are not well-conserved at the protein sequence level. This review will focus on the identification, characterization, and functions of the synaptonemal complex proteins in mammals.
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Affiliation(s)
- F Yang
- Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pa., USA
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31
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Wang PJ, Xia JH, Li YD, Liu CS. Crossover in the power-law behavior of confined energy in a composite granular chain. Phys Rev E Stat Nonlin Soft Matter Phys 2007; 76:041305. [PMID: 17994979 DOI: 10.1103/physreve.76.041305] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2007] [Revised: 10/04/2007] [Indexed: 05/25/2023]
Abstract
We present a numerical study of the impact energy decay in a composite granular chain containing two heavy and one light sections. We observe a marked crossover in the power-law behavior of the impact-energy decay. The average reflection frequency first increases with a decreasing acceleration, and arrives at its maximum at "crossing" time then decays almost exponentially. The analysis demonstrates that this phenomenon is related to the structural transition from compression to dilation state in both heavy-particle sections. The further calculations suggest the dependence relation of the power-law exponent (gammacb) in compression state on the mass ratio (m2/m1) and the Hertz law exponent (n) of the composite granular chain gammacb approximately (m2/m1)1/(n+1).
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Affiliation(s)
- P J Wang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, P. O. Box 1129, Hefei 230031, People's Republic of China
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Abstract
Up to now, the studies in the world have demonstrated that CT-guided percutaneous neurolytic celiac plexus block (PNCPB) is an invaluable therapeutic modality in the treatment of refractory abdominal pain caused by cancer. Its efficacy of pain relief varied in reported studies. The main technical considerations which would affect the analgesic effects on abdominal pain included the patients' cooperation, needle entry approaches, combined use of blocking approaches, localization of the target area, dosage of the blocker, and so on. A success of PNCPB depends greatly on close cooperation with patients. The patient should be educated about the purpose and steps of the procedure, and trained of breathing in and breathing hold. The needle entry can be divided into the posterior approach and the anterior approach. The former one is the most commonly used in clinical practice, but the latter one is rarely used except in the cases that the posterior approach becomes technically difficult. Bilateral multiple blocking of celiac plexus and splanchnic nerves is often required to achieve optimal analgesia. The needle entry site, insertion course, and depth should be preselected and simulated on CT monitor prior to the procedure in order to ensure an accurate and safe celiac plexus block. The magnitude of analgesic effect is closely related to the degree of degeneration and necrosis of the celiac plexus. Maximally filling with blocker in the retropancreatic space is an indication of sufficient blocking. We also provided an overview of indications and contraindications, preoperative preparations, complications and its treatment of PNCPB.
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Affiliation(s)
- P J Wang
- Department of Radiology, Tongji Hospital Affiliated to Tongji University, Shanghai 200065, China.
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33
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Abstract
NAC1 is a cocaine-regulated POZ/BTB (Pox virus and Zinc finger/Bric-a-brac Tramtrack Broad complex) protein. NAC1 is increased by cocaine selectively in the nucleus accumbens, a CNS region important for drug addiction. NAC1's role in the cell, however, is not known. Each of the two NAC1 isoforms, sNAC1 (short NAC1) and lNAC1 (long NAC1), may serve as corepressors for other POZ/BTB proteins. This study investigated whether sNAC1 and lNAC1 demonstrated protein-protein interactions with other corepressors. Histone deacetylase (HDAC) inhibition reversed sNAC1 and lNAC1 repression of Gal4 luciferase, but only in neuronal-like cultures. Because these inhibitors do not distinguish among histone deacetylases, two histone deacetylases were selected for further study. HDAC 3 and 4 both demonstrated protein-protein interactions with sNAC1 and lNAC1. This was shown using coimmunoprecipitations, glutathione-S-transferase (GST) pulldowns and mammalian two-hybrids. Importantly, either the POZ domain or NAC1 without the POZ domain can bind these two HDACs. Other corepressors, specifically NCoR (nuclear receptor corepressor), SMRT (silencing mediator for retinoid and thyroid hormone receptor) and mSin3a, do not exhibit protein-protein interactions with sNAC1 and lNAC1. None showed protein-protein interactions in GST pulldowns or mammalian two-hybrids. Taken together, the results of these experiments indicate sNAC1 and lNAC1 recruit histone deacetylases for transcriptional repression, further enhancing POZ/BTB protein mediated repression.
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Affiliation(s)
- L Korutla
- Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA
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34
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Abstract
Repeated exposure to cocaine can cause long-term behavioral changes in mammals, including an augmented locomotor response known as behavioral sensitization. A major goal of research is the identification of molecules associated with these behaviors. NAC1, a member of the POZ/BTB transcription factor family, exhibited increased mRNA levels in the nucleus accumbens of the rat weeks after cocaine use. NAC1 exists as two isoforms, each demonstrating the ability to inhibit transcription, but to different extents. The present experiments examined the time course for both NAC1 isoforms after five consecutive days of systemic cocaine administration in male rats. Tissues were collected from several central nervous system regions and underwent Western blot analysis. There was significantly greater expression of the long isoform, lNAC1 (cocaine 1.341+/-0.641; saline 1+/-0.321; P=.044), and the short isoform, sNAC1 (cocaine 3.038+/-2.816; saline 1+/-0.720; P=.001), in the nucleus accumbens of cocaine-treated rats. The olfactory tubercle also showed a significant increase, but only in sNAC1 expression and at only one time period. No other significant differences were observed for either isoform of NAC1 in any other brain region. The expression of lNAC1 exhibited an inverse relationship with behavioral sensitization in rats 1-3 months following repeated cocaine injections predicting approximately 40% of the variance in the behavior variables (R(2)=.387; and P=.031 for distance and P=.025 for ambulatory count). These results indicate that NAC1 expression is increased for a period of several months after chronic cocaine exposure. Furthermore, these data suggest that NAC1 may function as an endogenous inhibitor of behavioral sensitization. NAC1 represents a target for future studies examining cocaine-induced behavioral changes.
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Affiliation(s)
- P J Wang
- Department of Pharmacology, University of Pennsylvania, Philadelphia, PA 19104, USA
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35
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Korutla L, Wang PJ, Lewis DM, Neustadter JH, Stromberg MF, Mackler SA. Differences in expression, actions and cocaine regulation of two isoforms for the brain transcriptional regulator NAC1. Neuroscience 2002; 110:421-9. [PMID: 11906783 DOI: 10.1016/s0306-4522(01)00518-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [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: 11/21/2022]
Abstract
BTB/POZ proteins can influence the cell cycle and contribute to oncogenesis. Many family members are present in the mammalian CNS. Previous work demonstrated elevated NAC1 mRNA levels in the rat nucleus accumbens in response to cocaine. NAC1 acts like other BTB/POZ proteins that regulate transcription but is unusual because of the absence of identifiable DNA binding domains. cDNAs were isolated encoding two NAC1 isoforms differing by only 27 amino acids (the longer isoform contains 514 amino acids). The mRNAs for both isoforms were simultaneously expressed throughout the rat brain and peripheral tissues. Semi-quantitative reverse transcription-polymerase chain reaction analysis revealed that the mRNA of the longer isoform was more abundant than the mRNA of the shorter isoform. Western blot analysis demonstrated a similar unequal distribution between the isoforms in the CNS. The longer isoform was the more abundant of the two NAC1 proteins and the ratio between them differed throughout the rat brain. The shorter isoform was not detected in most of the examined peripheral tissues, suggesting differences from the CNS in post-transcriptional processing. Both isoforms repressed transcription in H293T cells using a Gal4-luciferase reporter system. However, the shorter isoform did not repress transcription as effectively as the longer isoform. Transfection of different ratios for both isoforms, in order to replicate the relative amounts observed throughout the CNS, supported an interaction between the isoforms. The net effect on transcriptional repression was determined by the ratio of the two NAC1 isoforms. Each isoform exhibited the subnuclear localization that is characteristic of many BTB/POZ proteins. A rapid and transient increase in the level of the shorter isoform occurred in the nucleus accumbens 2 h following a single i.p. cocaine injection. We conclude that the two isoforms of NAC1 may differentially affect neuronal functions, including the regulation of cocaine-induced locomotion.
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Affiliation(s)
- L Korutla
- Department of Medicine and Psychiatry, Medical Research Service, Philadelphia VAMC, PA 19104, USA
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Men FK, Liu F, Wang PJ, Chen CH, Cheng DL, Lin JL, Himpsel FJ. Self-organized nanoscale pattern formation on vicinal Si(111) surfaces via a two-stage faceting transition. Phys Rev Lett 2002; 88:096105. [PMID: 11864034 DOI: 10.1103/physrevlett.88.096105] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2000] [Revised: 12/04/2001] [Indexed: 05/23/2023]
Abstract
We demonstrate a self-organized pattern formation on vicinal Si(111) surfaces that are miscut toward the [2;11] direction. All the patterns, consisting of a periodic array of alternating (7 x 7) reconstructed terraces and step-bunched facets, have the same periodicity and facet structure, independent of the miscut angle, while the width of the facets increases linearly with miscut angle. We attribute such unique pattern formation to a surface faceting transition that involves two transition stages: the first stage forms a stress-domain structure defining the universal periodicity; the second stage forms the low-energy facets controlling the facet width.
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Affiliation(s)
- F K Men
- Department of Physics, National Chung Cheng University, Chia-Yi, Taiwan, Republic of China
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Abstract
We investigated the risk factors associated with infantile spasms (IS) by a hospital-based case-control study in Taiwan. Twenty-five patients with IS were recruited from one medical center (National Taiwan University Hospital) between 1990 and 1997. Based on a close-structured questionnaire, standardized interviews were carried out to obtain information on risk factors associated with IS. Two comparison groups are used, including a total of 106 subjects in the Disease Control group, and 139 subjects in the Normal Control group. Unconditional logistic regression is used to calculate odds ratios (OR) and 95% confidence interval (CI). Univariate analysis revealed gestational age, congenital cerebral anomalies, tuberous sclerosis (TS), asphyxia, febrile seizure, and developmental delay (before onset of spasm) were at increased risk of IS. After adjustment of multiple risk factors through unconditional logistic regression, significant risk factors for IS include congenital cerebral anomalies, TS, asphyxia, postterm, and developmental delay were highly associated with IS. The risk factors of IS may closely relate to underlying neurological abnormalities. Our results are consistent with the previous findings.
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Affiliation(s)
- H H Liou
- Department of Neurology and Pharmacology, National Taiwan University Hospital and National Taiwan University College of Medicine, 7 Chung San South Road, Taipei, Taiwan, ROC
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Chen PT, Young C, Lee WT, Wang PJ, Peng SS, Shen YZ. Early epileptic encephalopathy with suppression burst electroencephalographic pattern--an analysis of eight Taiwanese patients. Brain Dev 2001; 23:715-20. [PMID: 11701284 DOI: 10.1016/s0387-7604(01)00285-6] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Early epileptic encephalopathy with suppression burst (SB) comprises two distinct epileptic syndromes, early infantile epileptic encephalopathy (EIEE) and early myoclonic encephalopathy (EME). We reviewed etiologies, neurological outcome and clinico-electroencephalographic features of EIEE and EME. Chart records of early epileptic encephalopathy with SB from January 1997 to December 2000 were reviewed. These cases fulfilled the diagnostic criteria of EIEE and EME. Totally eight patients (four females, four males) were enrolled. They consisted of three cases of EIEE and five cases of EME. The follow-up periods ranged from 6 to 30 months. For EIEE, two cases had migrational disorders, and one was cryptogenic; for EME, three cases had non-ketotic hyperglycinemia (NKH), one was pyridoxine dependency and one was cryptogenic. The main initial seizure patterns were tonic spasms in EIEE, and were erratic myoclonus in EME. The age of seizure onset ranged from 26 h to 5 days after birth for EIEE, and 2 h to 7 days of life for EME. The SB pattern in the electroencephalography (EEG) was noted mainly during sleep state in EME, but in both awake and sleep states in EIEE. Asymmetric SB pattern and background activities in EEG were found in migrational disorders. The EEG in all cases of EIEE changed to hypsarrhythmia at 4-6 months of age. In EME, only the EEG in cases of NKH evolved to hypsarrhythmia. Response to anti-convulsants was generally poor. All had severe psychomotor retardation. Although EIEE and EME share several common features, differences in terms of seizure seminology and evolution, EEG patterns and etiologies still exist.
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Affiliation(s)
- P T Chen
- Department of Pediatrics, Cardinal Tien Hospital, No. 362, Chung-Cheng Road, Hsintien City, Taipei, Taiwan.
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Saeed M, Homoud MK, Wang PJ, Estes NA, Link MS. Role of invasive electrophysiologic testing in risk stratification for sudden cardiac death. J Invasive Cardiol 2001; 13:758-62. [PMID: 11689722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Affiliation(s)
- M Saeed
- Division of Cardiology, New England Medical Center, Box #197, Boston, MA 02111, USA
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40
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Affiliation(s)
- M S Link
- The Cardiac Arrhythmia Service, New England Medical Center, Tufts University School of Medicine, Boston, Massachusetts 02111, USA.
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Kosco KA, Pearson CG, Maddox PS, Wang PJ, Adams IR, Salmon ED, Bloom K, Huffaker TC. Control of microtubule dynamics by Stu2p is essential for spindle orientation and metaphase chromosome alignment in yeast. Mol Biol Cell 2001; 12:2870-80. [PMID: 11553724 PMCID: PMC59720 DOI: 10.1091/mbc.12.9.2870] [Citation(s) in RCA: 139] [Impact Index Per Article: 6.0] [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: 11/11/2022] Open
Abstract
Stu2p is a member of a conserved family of microtubule-binding proteins and an essential protein in yeast. Here, we report the first in vivo analysis of microtubule dynamics in cells lacking a member of this protein family. For these studies, we have used a conditional Stu2p depletion strain expressing alpha-tubulin fused to green fluorescent protein. Depletion of Stu2p leads to fewer and less dynamic cytoplasmic microtubules in both G1 and preanaphase cells. The reduction in cytoplasmic microtubule dynamics is due primarily to decreases in both the catastrophe and rescue frequencies and an increase in the fraction of time microtubules spend pausing. These changes have significant consequences for the cell because they impede the ability of cytoplasmic microtubules to orient the spindle. In addition, recovery of fluorescence after photobleaching indicates that kinetochore microtubules are no longer dynamic in the absence of Stu2p. This deficiency is correlated with a failure to properly align chromosomes at metaphase. Overall, we provide evidence that Stu2p promotes the dynamics of microtubule plus-ends in vivo and that these dynamics are critical for microtubule interactions with kinetochores and cortical sites in the cytoplasm.
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Affiliation(s)
- K A Kosco
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853-2703, USA
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42
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Chiang MC, Chou YH, Wang PJ. Auditory brainstem evoked potentials in healthy full-term and pre-term infants. Chang Gung Med J 2001; 24:557-62. [PMID: 11725625] [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: 02/22/2023]
Abstract
BACKGROUND Auditory brainstem evoked potentials (ABEP) are used to evaluate the integrity of auditory pathways. Since there are difficulties in the performance and still no reference ranges for pre-term infants in Taiwan, the purpose of this study was to evaluate the characteristics of ABEP in full-term and pre-term infants. METHODS Forty full-term and 52 pre-term infants were enrolled between January and December 1997. ABEP study was performed at 3-7 days after birth, 3, 6 and 12 months of age in the full-term group while the pre-term infants were assessed at 34-36 weeks of gestational age, at term age, and at 3, 6, 12 months of corrected age. Acoustic stimulation of mixed frequency rarefaction clicks was presented to each ear through earphones. The clicks were presented at an intensity of 70-90 dB (hearing level) and a gradual decrement of intensity to 20-40 dB to determine the threshold. Electrical activity was picked up by surface electrodes. Latency of peaks I, III, V, inter-peak latency I-III, III-V, I-V and the threshold were assessed. RESULTS In the full-term group, the peak and inter-peak latencies decreased with age. In the pre-term group, the responses of 70 dB stimulus intensity were 53.8%, 58%, 82.8%, 88.9%, 100% in the sequence and the threshold of response decreased with age. CONCLUSION There are maturational changes after birth in both full-term and pre-term infants. We conclude that ABEP study is a sensitive, non-invasive tool for the evaluation of auditory pathway in infants.
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Affiliation(s)
- M C Chiang
- Division of Neonatology, Department of Pediatrics, Chang Gung Children's Hospital, Taipei, Taiwan, R.O.C
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Abstract
Nuclear mRNA export mediated by the human protein TAP requires a carboxy-terminal domain that directly interacts with components of the nuclear pore complex. Here we demonstrate that NXF3, a human RNA binding protein related to TAP, lacks this domain yet retains the ability to export tethered RNA transcripts and to shuttle between the nucleus and the cytoplasm. NXF3 contains a novel Crm1-dependent nuclear export signal that compensates in cis for the loss of the nuclear pore targeting domain. NXF3-dependent RNA export is therefore blocked by Crm1-specific inhibitors that do not affect TAP function. Thus, while the related TAP and NXF3 proteins are both capable of mediating nuclear RNA export, they do so via unrelated export pathways.
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Affiliation(s)
- J Yang
- Howard Hughes Medical Institute, Department of Genetics, Duke University Medical Center, Durham, NC 27710, USA
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Yang GY, Wang PJ, Jia XB. [Effect of bushen huoxue decoction on in vitro fertilization and early embryonic development in mice]. Zhongguo Zhong Xi Yi Jie He Za Zhi 2001; 21:522-4. [PMID: 12575399] [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
OBJECTIVE To explore the effect of Bushen Huoxue decoction (BSHX) on female reproduction and elucidate its therapeutic mechanism to infertility. METHODS The BSHX medicated serum of rabbit, as a supplement, was co-cultured with the sperm and ovum of non-copulated mice, and the 2-cell embryos of copulated female mice separately, to observe the changes of in vitro fertilization rate (IVF) and early embryogenesis rate. RESULTS By co-cultured with BSHX medicated serum, IVF rate was increased obviously (P < 0.01), and the follow-up early embryogenesis rate at various period was promoted, particularly that of the 4-cell and 8-cell embryos (P < 0.05). No influence on developmental rate of in vitro 4-cell embryos obtained from the in vivo 2-cell embryos. But the development of the 8-cell embryos, morula, blastula and hatching were promoted significantly. CONCLUSION BSHX could raise the fertilization rate and promote the early embryonic development.
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Affiliation(s)
- G Y Yang
- Jiangsu Provincial Hospital of Integrated Traditional and Western Medicine, Nanjing 210028
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Saba S, Feld G, Yang S, MacAdam D, Su W, Link MS, Homoud MK, Foote C, Estes NA, Wang PJ. Testing of a new real-time computer algorithm as an aid to pace mapping and entrainment with concealed fusion. Am J Cardiol 2001; 87:1301-5. [PMID: 11377362 DOI: 10.1016/s0002-9149(01)01527-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- S Saba
- Tufts University-New England Medical Center, Boston, Massachusetts, USA.
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Saba S, VanderBrink BA, Perides G, Glickstein LJ, Link MS, Homoud MK, Bronson RT, Estes M, Wang PJ. Cardiac conduction abnormalities in a mouse model of Lyme borreliosis. J Interv Card Electrophysiol 2001; 5:137-43. [PMID: 11342749 DOI: 10.1023/a:1011469223042] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
BACKGROUND Borrelia Burgdorferi (BB) induces cardiac conduction abnormalities in infected humans. Mice models of Lyme disease have been developed, however their electrophysiologic (EP) properties of conduction are unknown. METHODS Seventy-six C3H/J mice (BB infected and age- and gender-matched controls) underwent blinded in vivo EP studies. In a first phase of the study, 40 male C3H/J mice were divided into 2 groups: Group (A) mice were infected at age 3 (weeks) and studied at 5, and Group (B) mice were infected at 9 and studied at 11. In a second phase, 36 female mice were divided into 2 groups: Group (C) mice were infected at 3 weeks and studied at 5, and Group (D) mice were infected at 3 and studied at 11. RESULTS Infected mice of group (A) and (C) had wider QRS complexes (21.0+/-1.6 versus 17.3+/-1.3ms, p< or =0.0001 and 20.3+/-2.1 versus 18.5+/-1.7, p = 0.05, respectively) compared to the healthy controls (HC). Infected mice of group (B) and group (D) were similar to the HC. In all groups, the presence of conduction abnormalities correlated very closely with the amount of inflammation on pathology. CONCLUSION This study describes the first EP mouse model of Lyme carditis. C3H/J mice exhibit conduction abnormalities that are reversible 8 weeks after inoculation, closely paralleling the resolution of inflammation on pathology. This model can be a valuable tool in the developing and testing of new modalities for the prevention and treatment of Lyme carditis.
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Affiliation(s)
- S Saba
- Division of Cardiology, Tufts University School of Medicine, New England Medical Center, Boston, Massachusetts, USA.
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47
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Abstract
Spermatogonia are the self-renewing, mitotic germ cells of the testis from which sperm arise by means of the differentiation pathway known as spermatogenesis. By contrast with hematopoietic and other mammalian stem-cell populations, which have been subjects of intense molecular genetic investigation, spermatogonia have remained largely unexplored at the molecular level. Here we describe a systematic search for genes expressed in mouse spermatogonia, but not in somatic tissues. We identified 25 genes (19 of which are novel) that are expressed in only male germ cells. Of the 25 genes, 3 are Y-linked and 10 are X-linked. If these genes had been distributed randomly in the genome, one would have expected zero to two of the genes to be X-linked. Our findings indicate that the X chromosome has a predominant role in pre-meiotic stages of mammalian spermatogenesis. We hypothesize that the X chromosome acquired this prominent role in male germ-cell development as it evolved from an ordinary, unspecialized autosome.
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Affiliation(s)
- P J Wang
- Howard Hughes Medical Institute, Whitehead Institute, and Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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48
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Abstract
CONTEXT Sudden cardiac death is a major public health problem in the United States, and improving survival after out-of-hospital cardiac arrest has been the subject of intense study. Early defibrillation has been shown to be critical to improving survival. Use of automated external defibrillators (AEDs) has become an important component of emergency medical systems, and recent advances in AED technology have allowed expansion of AED use to nontraditional first responders and the lay public. OBJECTIVES To examine advancements in AED technology, review the impact of AEDs on time to defibrillation and survival, and explore the future role of AEDs in the effort to improve survival following sudden cardiac arrest. DATA SOURCES MEDLINE was searched for articles from 1966 through December 2000 (Medical Subject Headings: electric countershock, heart arrest, resuscitation, emergency medical services; keywords: automatic external defibrillator, automated external defibrillator, public access defibrillation). Reference lists of relevant articles, news releases, and product information from manufacturers were also reviewed. STUDY SELECTION Initial MEDLINE search produced 4816 articles, from which 101 articles were selected for referencing based on having been published in a peer-reviewed journal and on relevance to the subject of the manuscript as determined by all 5 authors. DATA EXTRACTION All studies were critically reviewed for relevance, accuracy, and quality of data and study design by all authors. DATA SYNTHESIS Recent advances in AED technology and design have resulted in marked simplification of AED operation, improvements in accuracy and effectiveness, and reductions in cost. Use of AEDs by first responders and laypersons has reduced time to defibrillation and improved survival from sudden cardiac arrest in several communities. Initial studies of the cost-effectiveness of AED use in comparison with other commonly used treatments are favorable. CONCLUSION The AED represents an efficient method of delivering defibrillation to persons experiencing out-of-hospital cardiac arrest and its use by both traditional and nontraditional first responders appears to be safe and effective. The rapidly expanding role of AEDs in traditional emergency medical systems is supported by the literature, and initial studies of public access to defibrillation offer hope that further improvements in survival after sudden cardiac death can be achieved.
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Affiliation(s)
- J P Marenco
- New England Cardiac Arrhythmia Center, Division of Cardiology, New England Medical Center, 750 Washington St, Boston, MA 02111, USA.
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49
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Abstract
ECGs and cardiac rhythms of normal athletes can vary widely. The heightened vagal tone from athletic conditioning can result in variant ECG findings that may mimic serious disorders. ECG patterns of long-QT syndrome, arrhythmogenic right ventricular dysplasia, Wolff-Parkinson-White syndrome, and hypertrophic cardiomyopathy signal the need for further evaluation, therapy, and possible participation restriction. Radiofrequency ablation may be appropriate when symptomatic supraventricular arrhythmias or Wolff-Parkinson-White syndrome is present. Further research is needed to effectively distinguish normal ECG changes in the athlete from changes that underlie cardiac disease. Improvements in identifying athletes at risk of serious or life-threatening arrhythmias are also needed.
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Affiliation(s)
- M Estes
- Tufts University School of Medicine, Boston, MA, 02111, USA.
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50
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Abstract
Our data show that although estrogen does not seem to affect the QT interval in healthy women, it significantly decreases the QT dispersion. This finding could provide an explanation to the gender differences in susceptibility to ventricular arrhythmias, besides the difference in the incidence of coronary artery disease.
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Affiliation(s)
- S Saba
- Tufts University School of Medicine-New England Medical Center, Boston, Massachusetts, USA.
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