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Mei S, Yao S, Mo J, Wang Y, Tang J, Li W, Wu T. Integration of cloud-based molecular networking and docking for enhanced umami peptide screening from Pixian douban. Food Chem X 2024; 21:101098. [PMID: 38229673 PMCID: PMC10790023 DOI: 10.1016/j.fochx.2023.101098] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Revised: 12/17/2023] [Accepted: 12/21/2023] [Indexed: 01/18/2024] Open
Abstract
This study presents an innovative cloud-based approach, using Pixian Douban, a well-known Chinese fermented seasoning, as a case study, to improve the identification of umami peptides and explore their interactions with the T1R1/T1R3 receptor. A feature-based molecular networking method was utilized to rapidly identify a total of eighteen peptides, including seven previously unrecorded ones. Notably, the umami threshold of QIVK in an aqueous solution was determined to be 0.3215 mmol/L, surpassing the majority of peptides reported in the past three years. Molecular docking analysis further revealed the strong binding of QIVK to T1R3 receptor residues through hydrogen bonds, as well as interactions via salt bridges and electrostatic attractions. As a result, this research significantly contributes to the efficient screening of umami peptides and the elucidation of the molecular basis of umami sensory perception in complex food systems.
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Affiliation(s)
- Sen Mei
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China
| | - Shanshan Yao
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China
| | - Jingjing Mo
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China
| | - Yi Wang
- Xi'an Jiaotong University, No. 28 Xinning West Road, Xi'an, Shaanxi, 710049, China
| | - Jie Tang
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China
| | - Weili Li
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China
| | - Tao Wu
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China
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Zhuang M, Chen H, Li Y, Mei S, Liu J, Du B, Wang X, Wang X, Tang J. Laparoscopic posterior pelvic exenteration is safe and feasible for locally advanced primary rectal cancer in female patients: a comparative study from China PelvEx collaborative. Tech Coloproctol 2023; 27:1109-1117. [PMID: 37243857 DOI: 10.1007/s10151-023-02824-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 05/08/2023] [Indexed: 05/29/2023]
Abstract
PURPOSE Posterior pelvic exenteration (PPE) for locally advanced rectal cancer is a technical and challenging procedure. The safety and feasibility of laparoscopic PPE remain to be determined. This study aims to compare short-term and survival outcomes of laparoscopic PPE (LPPE) with open PPE (OPPE) in female patients. METHOD From January 2015 to December 2020, data from 105 female patients who underwent PPE at three institutions were retrospectively analyzed. The short-term and oncological outcomes between LPPE and OPPE were compared. RESULTS A total of 54 cases with LPPE and 51 cases with OPPE were enrolled. The operative time (240 vs. 295 min, p = 0.009), blood loss (100 vs. 300 ml, p < 0.001), surgical site infection (SSI) rate (20.4% vs. 58.8%, p = 0.003), urinary retention rate (3.7% vs. 17.6%, p = 0.020), and postoperative hospital stay (10 vs. 13 days, p = 0.009) were significantly lower in the LPPE group. The two groups showed no significant differences in the local recurrence rate (p = 0.296), 3-year overall survival (p = 0.129), or 3-year disease-free survival (p = 0.082). A higher CEA level (HR 1.02, p = 0.002), poor tumor differentiation (HR 3.05, p = 0.004), and (y)pT4b stage (HR 2.35, p = 0.035) were independent risk factors for disease-free survival. CONCLUSION LPPE is safe and feasible for locally advanced rectal cancers and shows lower operative time and blood loss, fewer SSI complications, and better preservation of bladder function without compromising oncological outcomes.
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Affiliation(s)
- M Zhuang
- Department of Colorectal Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - H Chen
- Department of General Surgery, Tianjin Fifth Central Hospital, Tianjin, 300450, China
| | - Y Li
- Department of Colorectal Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - S Mei
- Department of Colorectal Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - J Liu
- Department of General Surgery, Peking University First Hospital, Beijing, 100034, China
| | - B Du
- Department of Colorectal Surgery, Gansu Provincial Hospital, Lanzhou, 730000, China
| | - X Wang
- Department of General Surgery, Peking University First Hospital, Beijing, 100034, China
| | - Xishan Wang
- Department of Colorectal Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China.
| | - J Tang
- Department of Colorectal Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China.
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Liu M, Dang Y, Huang H, Lu Z, Mei S, Cai Y, Zhou W, Zhao W. Vector solitonic pulses excitation in microresonators via free carrier effects. Opt Express 2023; 31:32172-32187. [PMID: 37859026 DOI: 10.1364/oe.498671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 09/02/2023] [Indexed: 10/21/2023]
Abstract
We numerically investigate the excitation of vector solitonic pulse with orthogonally polarized components via free-carrier effects in microresonators with normal group velocity dispersion (GVD). The dynamics of single, dual and oscillated vector pulses are unveiled under turn-key excitation with a single frequency-fixed CW laser source. Parameter spaces associated with detuning, polarization angle, interval between the pumped orthogonal resonances and pump amplitude have been revealed. Different vector pulse states can also be observed exploiting the traditional pump scanning scheme. Simultaneous and independent excitation regimes are identified due to varying interval of the orthogonal pump modes. The nonlinear coupling between two modes contributes to the distortion of the vector pulses' profile. The free-carrier effects and the pump polarization angle provide additional degrees of freedom for efficiently controlling the properties of the vector solitonic microcombs. Moreover, the crucial thermal dynamics in microcavities is discussed and weak thermal effects are found to be favorable for delayed vector pulse formation. These findings reveal complex excitation mechanism of solitonic structures and could provide novel routes for microcomb generation.
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Mei S, Chen LX, Zhang HL, Li ZW, Cheng LW, Lu JH, Li XQ, Yang Q, Wang YL, Liu ZY, Chai ZF, Wang S. Assembling a Heterobimetallic Actinide Metal-Organic Framework by a Reaction-Induced Preorganization Strategy. Angew Chem Int Ed Engl 2023:e202306360. [PMID: 37211534 DOI: 10.1002/anie.202306360] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 05/07/2023] [Revised: 05/12/2023] [Accepted: 05/19/2023] [Indexed: 05/23/2023]
Abstract
Periodically arranging coordination-distinct actinides into one crystalline architecture is intriguing but of great synthetic challenge. We report a rare example of a heterobimetallic actinide metal-organic framework (An-MOF) by a unique reaction-induced preorganization strategy. A thorium MOF (SCU-16) with the largest unit cell among all Th-MOFs was prepared as the precursor, then the uranyl was precisely embedded into the MOF precursor under oxidation condition. Single crystal of the resulting thorium-uranium MOF (SCU-16-U) shows that a uranyl-specific site was in situ induced by the formate-to-carbonate oxidation reaction. The heterobimetallic SCU-16-U exhibits multifunction catalysis properties derived from two distinct actinides. The strategy proposed here offers a new avenue to create mixed-actinide functional material with unique architecture and versatile functionality.
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Affiliation(s)
- Sen Mei
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Li Xi Chen
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Hai Long Zhang
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Zhi Wei Li
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Li Wei Cheng
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Jun Hao Lu
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Xiao Qi Li
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Qian Yang
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Yan Long Wang
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Zhi Yong Liu
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Zhi Fang Chai
- Soochow University, State Key Laboratory of Radiation Medicine and Protection, CHINA
| | - Shuao Wang
- Soochow University, School for Radiological and interdisciplinary Sciences, 199 Renai Road, 215123, Suzhou, CHINA
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Li W, Mei S, Zhou H, Salman Farid M, Hu T, Wu T. Metabolite fingerprinting of the ripening process in Pixian douban using a feature-based molecular network and metabolomics analysis. Food Chem 2023; 418:135940. [PMID: 36965392 DOI: 10.1016/j.foodchem.2023.135940] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 01/08/2023] [Revised: 03/09/2023] [Accepted: 03/10/2023] [Indexed: 03/27/2023]
Abstract
The unique flavor of Pixian douban (PXDB) is widely acknowledged to be associated with its maturation process. However, there is limited knowledge about the non-volatile metabolites that contribute to this flavor. To bridge this gap, this study employed a metabolomics approach and a feature-based molecular network (FBMN) analysis to investigate the non-volatile metabolite fingerprints of PXDB during its two-year maturation process. Specifically, the FBMN tool was utilized to annotate the flavonoid, amide derivatives, and lipid components of PXDB for the first time. Subsequently, the MolNetEnhancer tool was employed to complement the FBMN annotation and identify eight substructural components. Finally, metabolomics analysis was carried out to identify 45 key metabolites involved in flavor formation across 10 major metabolic pathways (p < 0.05). Overall, the findings of this study have significantly expanded our understanding of the non-volatile metabolite fingerprinting and flavor formation mechanisms.
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Affiliation(s)
- Weili Li
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China
| | - Sen Mei
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China
| | - Huanzhen Zhou
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China
| | - Muhammad Salman Farid
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo 315211, China
| | - Tao Hu
- Sichuan Teway Food Group Co., Ltd., No. 333, Tengfei 1st Road, Xihangangangang Street, Chengdu 610207, China
| | - Tao Wu
- Food Microbiology Key Laboratory of Sichuan Province, Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Xihua University, No.999 Guangchang Road, Chengdu 610039, China.
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Li M, Mei S, Yang Y, Shen Y, Chen L. Strategies to mitigate the on- and off-target toxicities of recombinant immunotoxins: an antibody engineering perspective. Antib Ther 2022; 5:164-176. [PMID: 35928456 PMCID: PMC9344849 DOI: 10.1093/abt/tbac014] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 10/14/2021] [Accepted: 06/14/2022] [Indexed: 11/14/2022] Open
Abstract
Abstract
Targeted cancer therapies using immunotoxins has achieved remarkable efficacies in hematological malignancies. However, the clinical development of immunotoxins is also faced with many challenges like anti-drug antibodies and dose-limiting toxicity issues. Such a poor efficacy/safety ratio is also the major hurdle in the research and development of antibody-drug conjugates. From an antibody engineering perspective, various strategies were summarized/proposed to tackle the notorious on target off tumor toxicity issues, including passive strategy (XTENylation of immunotoxins) and active strategies (modulating the affinity and valency of the targeting moiety of immunotoxins, conditionally activating immunotoxins in the tumor microenvironments and reconstituting split toxin to reduce systemic toxicity etc.). By modulating the functional characteristics of the targeting moiety and the toxic moiety of immunotoxins, selective tumor targeting can be augmented while sparing the healthy cells in normal tissues expressing the same target of interest. If successful, the improved therapeutic index will likely help to address the dose-limiting toxicities commonly observed in the clinical trials of various immunotoxins.
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Affiliation(s)
- Mengyu Li
- Department of Postgraduate , Jiangxi University of Traditional Chinese Medicine, Nanchang, P.R. China
- Joint Graduate School , Yangtze Delta Drug Advanced Research Institute, Nantong, P.R. China
- Joint Graduate School , Yangtze Delta Pharmaceutical College, Nantong, P.R. China
| | - Sen Mei
- Biotherapeutics , Biocytogen Jiangsu Co. Ltd, Nantong, P.R. China
| | - Yi Yang
- Joint Graduate School , Yangtze Delta Drug Advanced Research Institute, Nantong, P.R. China
- Joint Graduate School , Yangtze Delta Pharmaceutical College, Nantong, P.R. China
- Institute of Innovative Medicine , Biocytogen Pharmaceuticals (Beijing) Co, Ltd, Beijing, P.R. China
| | - Yuelei Shen
- Joint Graduate School , Yangtze Delta Drug Advanced Research Institute, Nantong, P.R. China
- Joint Graduate School , Yangtze Delta Pharmaceutical College, Nantong, P.R. China
- Biotherapeutics , Biocytogen Pharmaceuticals (Beijing) Co, Ltd, Beijing, P.R. China
- Institute of Innovative Medicine , Biocytogen Pharmaceuticals (Beijing) Co, Ltd, Beijing, P.R. China
| | - Lei Chen
- Biotherapeutics , Biocytogen Jiangsu Co. Ltd, Nantong, P.R. China
- Biotherapeutics , Biocytogen Pharmaceuticals (Beijing) Co, Ltd, Beijing, P.R. China
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Tang L, Hu J, Mei S, Wu D, Zhang J, Wu W, Li H, Li H. Comparative analysis of the interaction between azobenzene di-maleimide and human serum albumin/lysozyme. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Qin Y, Liu Y, Jiang Y, Mei S, Liu Y, Feng J, Guo L, Du J, Graves DT, Liu Y. Cigarette Smoke Exposure Inhibits Osteoclast Apoptosis via the mtROS Pathway. J Dent Res 2021; 100:1378-1386. [PMID: 33978516 PMCID: PMC8723169 DOI: 10.1177/00220345211009471] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
It is widely known that smoking is a risk factor for bone loss and plays a key role in osteopenia. Despite this well-known association, the mechanisms by which smoking affects bone have not been definitively established. Since smoking increases bone loss and potentially affects bone resorption in response to mechanical force, we investigated the impact of cigarette smoke on osteoclast numbers and underlying mechanisms in a mouse model of orthodontic tooth movement (OTM). The experimental group was exposed to once-daily cigarette smoke while the control group was not, and tooth movement distance and osteoclast numbers were assessed. In addition, the effect of cigarette smoke extract (CSE) on osteoclast precursor proliferation and osteoclast apoptosis was assessed in vitro. We found that cigarette smoke exposure enhanced bone remodeling stimulated by mechanical force and increased osteoclast numbers in vivo. Also, CSE increased the number of osteoclasts by inhibiting osteoclast apoptosis via the mitochondrial reactive oxygen species/cytochrome C/caspase 3 pathway in vitro. Moreover, exposure of mice to cigarette smoke affected bone marrow cells, leading to increased formation of osteoclasts in vitro. This study identifies a previously unknown mechanism of how smoking has a detrimental impact on bone.
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Affiliation(s)
- Y Qin
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China
| | - Y Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China
| | - Y Jiang
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China
| | - S Mei
- Department of Stomatology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Y Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China
| | - J Feng
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China
| | - L Guo
- Department of Orthodontics School of Stomatology, Capital Medical University, Beijing, China
| | - J Du
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China
| | - D T Graves
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Y Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, China
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Zheng X, Wang YC, Zhu N, Cai DY, Gong XK, Mei S, Chen WJ, Chen T, Ruan JW. Downregulation of GNAS inhibits osteogenesis of bone marrow mesenchymal stem cells and promotes osteoporosis through the Wnt pathway. Eur Rev Med Pharmacol Sci 2021; 24:2886-2892. [PMID: 32271406 DOI: 10.26355/eurrev_202003_20652] [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: 11/12/2022]
Abstract
OBJECTIVE This study aims to explore the role of GNAS in accelerating the progression of osteoporosis by inhibiting osteogenesis of BMSCs by the Wnt pathway. PATIENTS AND METHODS GNAS levels in OP tissues and BMSCs undergoing osteogenesis for different time points were detected. Regulatory effects of GNAS on osteogenesis-related gene expressions, ALP activity, capability of mineralization, and activation of the Wnt pathway in BMSCs were assessed through a series of functional experiments. At last, rescue experiments were performed to further verify the significance of the Wnt pathway during GNAS-mediated osteogenesis development. RESULTS GNAS was downregulated in OP tissues relative to normal bone tissues. With the prolongation of osteogenesis, GNAS level gradually increased in BMSCs. Knockdown of GNAS downregulated expression levels of ALP and RUNX2, and attenuated ALP activity and capability of mineralization in BMSCs. GNAS was able to activate the Wnt pathway in BMSCs. Notably, overexpression of Wnt3a could reverse the regulatory effects of GNAS on osteogenesis-related gene expressions, ALP activity, and capability of mineralization in BMSCs. CONCLUSIONS Downregulation of GNAS suppresses osteogenesis of BMSCs through the Wnt pathway, thus aggravating the progression of osteoporosis.
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Affiliation(s)
- X Zheng
- Department of Orthopedics, Taizhou Municipal Hospital, Taizhou, Zhejiang Province, China.
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Dempsey DE, Cronin SJ, Mei S, Kempa-Liehr AW. Automatic precursor recognition and real-time forecasting of sudden explosive volcanic eruptions at Whakaari, New Zealand. Nat Commun 2020; 11:3562. [PMID: 32678107 PMCID: PMC7367339 DOI: 10.1038/s41467-020-17375-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 06/29/2020] [Indexed: 11/23/2022] Open
Abstract
Sudden steam-driven eruptions strike without warning and are a leading cause of fatalities at touristic volcanoes. Recent deaths following the 2019 Whakaari eruption in New Zealand expose a need for accurate, short-term forecasting. However, current volcano alert systems are heuristic and too slowly updated with human input. Here, we show that a structured machine learning approach can detect eruption precursors in real-time seismic data streamed from Whakaari. We identify four-hour energy bursts that occur hours to days before most eruptions and suggest these indicate charging of the vent hydrothermal system by hot magmatic fluids. We developed a model to issue short-term alerts of elevated eruption likelihood and show that, under cross-validation testing, it could provide advanced warning of an unseen eruption in four out of five instances, including at least four hours warning for the 2019 eruption. This makes a strong case to adopt real-time forecasting models at active volcanoes. In this study, the authors investigate the predictability of sudden eruptions, motivated by the 2019 eruption at Whakaari (White Island), New Zealand. The paper proposes a machine learning approach that is able to identify eruption precursors in data streaming from a single seismic station at Whakaari.
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Affiliation(s)
- D E Dempsey
- University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand.
| | - S J Cronin
- University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - S Mei
- University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
| | - A W Kempa-Liehr
- University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand
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Guo Q, Mei S, Xie C, Mi H, Jiang Y, Zhang SD, Tan TW, Fan LH. Reprogramming of sugar transport pathways in Escherichia coli using a permeabilized SecY protein-translocation channel. Biotechnol Bioeng 2020; 117:1738-1746. [PMID: 32048725 PMCID: PMC7147117 DOI: 10.1002/bit.27306] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 01/13/2020] [Accepted: 02/10/2020] [Indexed: 12/22/2022]
Abstract
In the initial step of sugar metabolism, sugar‐specific transporters play a decisive role in the passage of sugars through plasma membranes into cytoplasm. The SecY complex (SecYEG) in bacteria forms a membrane channel responsible for protein translocation. The present work shows that permeabilized SecY channels can be used as nonspecific sugar transporters in Escherichia coli. SecY with the plug domain deleted allowed the passage of glucose, fructose, mannose, xylose, and arabinose, and, with additional pore‐ring mutations, facilitated lactose transport, indicating that sugar passage via permeabilized SecY was independent of sugar stereospecificity. The engineered E. coli showed rapid growth on a wide spectrum of monosaccharides and benefited from the elimination of transport saturation, improvement in sugar tolerance, reduction in competitive inhibition, and prevention of carbon catabolite repression, which are usually encountered with native sugar uptake systems. The SecY channel is widespread in prokaryotes, so other bacteria may also be engineered to utilize this system for sugar uptake. The SecY channel thus provides a unique sugar passageway for future development of robust cell factories for biotechnological applications.
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Affiliation(s)
- Qiang Guo
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Sen Mei
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Chong Xie
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Hao Mi
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Yang Jiang
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Shi-Ding Zhang
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Tian-Wei Tan
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Li-Hai Fan
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
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Wu D, Mei S, Duan R, Geng F, Wu W, Li X, Cheng L, Wang C. How black tea pigment theaflavin dyes chicken eggs: Binding affinity study of theaflavin with ovalbumin. Food Chem 2020; 303:125407. [DOI: 10.1016/j.foodchem.2019.125407] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/26/2019] [Accepted: 08/21/2019] [Indexed: 12/31/2022]
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Mei S, Moron A, Lee R, Kanis M, Lee Y. Trends in sentinel lymph node biopsy for vulvar carcinoma and associated disparities in its utilization. Gynecol Oncol 2019. [DOI: 10.1016/j.ygyno.2019.04.274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Feng M, Jin JQ, Xia L, Xiao T, Mei S, Wang X, Huang X, Chen J, Liu M, Chen C, Rafi S, Zhu AX, Feng YX, Zhu D. Pharmacological inhibition of β-catenin/BCL9 interaction overcomes resistance to immune checkpoint blockades by modulating T reg cells. Sci Adv 2019; 5:eaau5240. [PMID: 31086813 PMCID: PMC6506245 DOI: 10.1126/sciadv.aau5240] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 03/27/2019] [Indexed: 06/09/2023]
Abstract
The Wnt/β-catenin (β-cat) pathway plays a critical role in cancer. Using hydrocarbon-stapled peptide technologies, we aim to develop potent, selective inhibitors targeting this pathway by disrupting the interaction of β-cat with its coactivators B-cell lymphoma 9 (BCL9) and B-cell lymphoma 9-like (B9L). We identified a set of peptides, including hsBCL9CT-24, that robustly inhibits the activity of β-cat and suppresses cancer cell growth. In animal models, these peptides exhibit potent anti-tumor effects, favorable pharmacokinetic profiles, and minimal toxicities. Markedly, these peptides promote intratumoral infiltration of cytotoxic T cells by reducing regulatory T cells (Treg) and increasing dendritic cells (DCs), therefore sensitizing cancer cells to PD-1 inhibitors. Given the strong correlation between Treg infiltration and APC mutation in colorectal cancers, it indicates our peptides can reactivate anti-cancer immune response suppressed by the oncogenic Wnt pathway. In summary, we report a promising strategy for cancer therapy by pharmacological inhibition of the Wnt/β-cat signaling.
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MESH Headings
- Animals
- Antineoplastic Agents, Immunological/metabolism
- Antineoplastic Agents, Immunological/pharmacology
- Cell Line, Tumor
- Cell Proliferation/drug effects
- Chemokine CCL20/antagonists & inhibitors
- Chemokine CCL20/metabolism
- Chemokine CCL22/antagonists & inhibitors
- Chemokine CCL22/metabolism
- Colorectal Neoplasms/metabolism
- Colorectal Neoplasms/pathology
- Female
- Humans
- Mice
- Mice, Inbred BALB C
- Mice, Nude
- Peptides/metabolism
- Peptides/pharmacology
- T-Lymphocytes, Cytotoxic/cytology
- T-Lymphocytes, Cytotoxic/immunology
- T-Lymphocytes, Cytotoxic/metabolism
- T-Lymphocytes, Regulatory/cytology
- T-Lymphocytes, Regulatory/immunology
- T-Lymphocytes, Regulatory/metabolism
- Transcription Factors/antagonists & inhibitors
- Transcription Factors/chemistry
- Transcription Factors/metabolism
- Transplantation, Heterologous
- Wnt Signaling Pathway/drug effects
- beta Catenin/antagonists & inhibitors
- beta Catenin/metabolism
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Affiliation(s)
- M. Feng
- School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - J. Q. Jin
- Harvard College, Harvard University, Cambridge, MA 02138, USA
| | - L. Xia
- School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - T. Xiao
- Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02145, USA
| | - S. Mei
- Department of Bioinformatics, School of Life Sciences and Technology, Tongji University, Shanghai, China
| | - X. Wang
- School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - X. Huang
- School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - J. Chen
- School of Pharmacy, Fudan University, Shanghai, 201203, China
| | - M. Liu
- Harvard College, Harvard University, Cambridge, MA 02138, USA
| | - C. Chen
- Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02145, USA
| | - S. Rafi
- Schrödinger, LLC, Cambridge, MA 02142, USA
| | - A. X. Zhu
- Massachusetts General Hospital Cancer Center, Boston, MA 02114, USA
| | - Y.-X. Feng
- The First Affiliated Hospital, Zhejiang University School of Medicine, Institute of Translational Medicine, Zhejiang University, Hangzhou 310029, China
- Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA
| | - D. Zhu
- School of Pharmacy, Fudan University, Shanghai, 201203, China
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15
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Gong J, Tian J, Lou J, Wang X, Ke J, Li J, Yang Y, Gong Y, Zhu Y, Zou D, Peng X, Yang N, Mei S, Zhong R, Chang J, Miao X. A polymorphic MYC response element in KBTBD11 influences colorectal cancer risk, especially in interaction with an MYC-regulated SNP rs6983267. Ann Oncol 2019; 29:632-639. [PMID: 29267898 DOI: 10.1093/annonc/mdx789] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Background MYC is a well-established cancer driver gene regulating the expression of numerous genes, indicating that polymorphisms in MYC response elements could affect tumorigenesis through altering MYC regulation. We performed integrative multistage study to evaluate the effects of variants in MYC response elements and colorectal cancer (CRC) risk. Patients and methods We systematically integrated ChIP-Seq, DNase-Seq and transcription factor motif data to screen variants with potential ability to affect the MYC binding affinity. Then, we conducted a two-stage case-control study, totally consisting of 4830 CRC cases and 4759 controls in Chinese population to identify risk polymorphisms and interactions. The effects of risk variants were confirmed by functional assays in CRC LoVo, SW480 and HCT15 cells. Results We identified a novel polymorphism rs11777210 in KBTBD11 significantly associated with CRC susceptibility (P = 2.43 × 10-12). Notably, we observed a significant interaction between rs11777210 and MYC nearby rs6983267 (P-multi = 0.003, P-add = 0.005), subjects carrying rs6983267 GG and rs11777210 CC genotypes showing higher susceptibility to CRC (2.83-fold) than those carrying rs6983267 TT and rs11777210 TT genotypes. We further demonstrated that rs6983267 T > G increased MYC expression, and MYC bound to and negatively regulated KBTBD11 expression when the rs11777210 C risk allele was present. KBTBD11 was downregulated in tumor tissues, and KBTBD11 knockdown promoted cell proliferation and inhibited cell apoptosis. Conclusion The rs11777210 is a potential predictive biomarker of CRC susceptibility, and KBTBD11 functions as a putative tumor suppressor in tumorigenesis. Our study highlighted the high CRC risk of people carrying rs6983267 G and rs11777210 C alleles, and provided possible biological mechanism of the interaction.
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Affiliation(s)
- J Gong
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - J Tian
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - J Lou
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - X Wang
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - J Ke
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - J Li
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Y Yang
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Y Gong
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Y Zhu
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - D Zou
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - X Peng
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - N Yang
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - S Mei
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - R Zhong
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - J Chang
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - X Miao
- Department of Epidemiology and Biostatistics, Huazhong University of Science and Technology, Wuhan, China; State Key Laboratory of Environment Health (Incubation), MOE (Ministry of Education) Key Laboratory of Environment & Health, Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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16
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Jaffe GR, Mei S, Boyle C, Kirch JD, Savage DE, Botez D, Mawst LJ, Knezevic I, Lagally MG, Eriksson MA. Measurements of the Thermal Resistivity of InAlAs, InGaAs, and InAlAs/InGaAs Superlattices. ACS Appl Mater Interfaces 2019; 11:11970-11975. [PMID: 30807087 DOI: 10.1021/acsami.8b17268] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Thermal management efforts in nanoscale devices must consider both the thermal properties of the constituent materials and the interfaces connecting them. It is currently unclear whether alloy/alloy semiconductor superlattices such as InAlAs/InGaAs have lower thermal conductivities than their constituent alloys. We report measurements of the crossplane thermal resistivity of InAlAs/InGaAs superlattices at room temperature, showing that the superlattice resistivities are larger by a factor of 1.2-1.6 than that of the constituent bulk materials, depending on the strain state and composition. We show that the additional resistance present in these superlattices can be tuned by a factor of 2.5 by altering the lattice mismatch and thereby the phonon-mode mismatch at the interfaces, a principle that is commonly assumed for superlattices but has not been experimentally verified without adding new elements to the layers. We find that the additional resistance in superlattices does not increase significantly when the layer thickness is decreased from 4 to 2 nm. We also report measurements of 250-1000 nm thick films of undoped InGaAs and InAlAs lattice-matched to InP substrates, for there is no published thermal conductivity value for the latter, and we find it to be 2.24 ± 0.09 at 22 °C, which is ∼2.7 times smaller than the widely used estimates.
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17
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Wu Q, Wang C, Shi H, Mei S, Liu L, Xin Y, Kong X. Identification of 4 novel mutations of androgen receptor gene in 8 Chinese families with complete androgen insensitivity syndrome. Clin Genet 2018; 94:269-270. [PMID: 29693241 DOI: 10.1111/cge.13248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 02/26/2018] [Accepted: 03/03/2018] [Indexed: 11/29/2022]
Affiliation(s)
- Q Wu
- Center of Genetics and Prenatal Diagnosis, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - C Wang
- Center of Genetics and Prenatal Diagnosis, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - H Shi
- Center of Genetics and Prenatal Diagnosis, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - S Mei
- Center of Genetics and Prenatal Diagnosis, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - L Liu
- Department of Rheumatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Y Xin
- Department of Obstetrics and Gynecology, The Zhengzhou Central Hospital of Zhengzhou University, Zhengzhou, China
| | - X Kong
- Center of Genetics and Prenatal Diagnosis, Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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18
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Ranjan A, Raghavan N, O'Shea SJ, Mei S, Bosman M, Shubhakar K, Pey KL. Conductive Atomic Force Microscope Study of Bipolar and Threshold Resistive Switching in 2D Hexagonal Boron Nitride Films. Sci Rep 2018; 8:2854. [PMID: 29434292 PMCID: PMC5809508 DOI: 10.1038/s41598-018-21138-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 01/29/2018] [Indexed: 11/09/2022] Open
Abstract
This study investigates the resistive switching characteristics and underlying mechanism in 2D layered hexagonal boron nitride (h-BN) dielectric films using conductive atomic force microscopy. A combination of bipolar and threshold resistive switching is observed consistently on multi-layer h-BN/Cu stacks in the low power regime with current compliance (Icomp) of less than 100 nA. Standard random telegraph noise signatures were observed in the low resistance state (LRS), similar to the trends in oxygen vacancy-based RRAM devices. While h-BN appears to be a good candidate in terms of switching performance and endurance, it performs poorly in terms of retention lifetime due to the self-recovery of LRS state (similar to recovery of soft breakdown in oxide-based dielectrics) that is consistently observed at all locations without requiring any change in the voltage polarity for Icomp ~1–100 nA.
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Affiliation(s)
- A Ranjan
- Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore. .,Institute of Materials Research and Engineering, Agency for Science Technology and Research, 2 Fusionopolis Way, 138634, Singapore.
| | - N Raghavan
- Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore
| | - S J O'Shea
- Institute of Materials Research and Engineering, Agency for Science Technology and Research, 2 Fusionopolis Way, 138634, Singapore
| | - S Mei
- Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore.,Institute of Materials Research and Engineering, Agency for Science Technology and Research, 2 Fusionopolis Way, 138634, Singapore
| | - M Bosman
- Institute of Materials Research and Engineering, Agency for Science Technology and Research, 2 Fusionopolis Way, 138634, Singapore
| | - K Shubhakar
- Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore
| | - K L Pey
- Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore.
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19
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Du J, Mei S, Guo L, Su Y, Wang H, Liu Y, Zhao Z, Wang S, Liu Y. Platelet‐rich fibrin/aspirin complex promotes alveolar bone regeneration in periodontal defect in rats. J Periodontal Res 2017; 53:47-56. [PMID: 28862325 DOI: 10.1111/jre.12485] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/16/2017] [Indexed: 12/24/2022]
Affiliation(s)
- J. Du
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction School of Stomatology Capital Medical University Beijing China
| | - S. Mei
- Department of Pharmacy Beijing Tiantan Hospital Capital Medical University Beijing China
| | - L. Guo
- Department of Orthodontics School of Stomatology Capital Medical University Beijing China
| | - Y. Su
- Department of Stomatology Beijing Tiantan Hospital Capital Medical University Beijing China
| | - H. Wang
- Department of Stomatology Beijing Tiantan Hospital Capital Medical University Beijing China
| | - Y. Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction School of Stomatology Capital Medical University Beijing China
| | - Z. Zhao
- Department of Pharmacy Beijing Tiantan Hospital Capital Medical University Beijing China
| | - S. Wang
- Salivary Gland Disease Center and Molecular Laboratory for Gene Therapy and Tooth Regeneration School of Stomatology Capital Medical University Beijing China
| | - Y. Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction School of Stomatology Capital Medical University Beijing China
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20
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Pan Y, Tian T, Park C, Lofftus S, Mei S, Liu X, Luo C, O'Malley J, Gehad A, Teague J, Divito S, Fuhlbrigge R, Puigserver P, Krueger J, Hotamisligil G, Clark R, Kupper T. 055 Tissue resident memory T cell survival requires exogenous lipid uptake and metabolism. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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21
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Zhang GM, Xia JM, Sun Y, Fan LH, Duan YY, Yu SH, Duan BS, Li B, Mei S, Zhou L, Huang HB, Li JY, Guo QZ, Zhu JM. [Treatment strategies of complex lesions in patients with acute Stanford type A dissection of important branches involvement]. Zhonghua Wai Ke Za Zhi 2017; 55:251-254. [PMID: 28355760 DOI: 10.3760/cma.j.issn.0529-5815.2017.04.003] [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
Acute Stanford type A aortic dissection with important branches involved is more complex, could lead to organ malperfusion syndrome even organ failure. The understanding of pathological anatomy, classification, staging, and the pathophysiological change has increasingly mature, but not complete. In addition, the treatment strategy for complex lesions is diversified, some questions may not reach consensus. Fully understanding of the anatomical and pathophysiology is very important for surgeons to choose reasonable treatment strategy. As the rapid development of the basic research, imaging techniques and the concept of surgery procedures, the manage technique of Stanfrod type A dissection and branch vessels at the same time is getting seriously, the related issues also need further discussions.
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Affiliation(s)
- G M Zhang
- Department of Cardiovascular Surgery, First Affiliated Hospital of Kunming Medical University, Kunming 650032, China
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22
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Yang B, Wu J, Liang X, Mei S, Zhou B. Abstract P1-01-17: Establishment and preliminary clinical application of breast cancer CTC detection kit based on immune magnetic lipid microsphere/human breast mammaglobin. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p1-01-17] [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] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Objective
To explore the effect of breast cancer CTC detection kit based on immune magnetic lipid microsphere (IML) separation and human breast mammaglobin (hMAN) identification, we combined epithelial cell adhesion molecule (EpCAM) IML enrichment and immune fluorescence staining of CK/hMAN (IML/hM-BCD) method.
Methods
74 patients with metastatic breast cancer (MBC) were selected to validate the performance of our integrated CTC capture platform by carrying out side-by-side comparisons with the Cellsearch assay using the same sample. In each study, 15 mL blood was divided equally to identify CTC numbers by employing either Cellsearch and our platform.
Results
In MBC patients, the rates of diagnostic positive detection of Cellsearch and IML/hM-BCD method were 50% and 83.4%, respectively. The IML/hM-BCD method presented a greater ability to capture CTCs from MBC patients. A significant difference in the number (1~5) of CTCs captured by IMLM was observed in the images (2-fold more for IMLM vs CellsearchTM, P<0.001). Furthermore, the morphology and footprint sizes of the cells detected by IML/hM-BCD method offer another approach to validating these observations from the perspectives of cell pathology and cytology. The combined information was utilized to delineate CTCs (DAPI+/CK+/CD45-, cell size > 5 µm) from WBCs (DAPI+/CK-/CD45+, cell size < 15 µm) and cellular debris. Our immunomagnetic lipid microsphere captured significantly different CTC numbers that corresponded to the patients' clinical data.
Conclusions
The panel of IML separation and combined CK/hMAN identification may serve as representative enrichment and biomarkers for CTCs, thus it presents potentially significant valve for monitoring early metastasis, therapeutic efficacy and prognosis for the patients with breast cancer.
Citation Format: Yang B, Wu J, Liang X, Mei S, Zhou B. Establishment and preliminary clinical application of breast cancer CTC detection kit based on immune magnetic lipid microsphere/human breast mammaglobin [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P1-01-17.
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Affiliation(s)
- B Yang
- Fudan University Shanghai Cancer Center, Shanghai, China; State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China; Shanghai Baihuikang Biotechnology Co., Ltd, Shanghai, China
| | - J Wu
- Fudan University Shanghai Cancer Center, Shanghai, China; State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China; Shanghai Baihuikang Biotechnology Co., Ltd, Shanghai, China
| | - X Liang
- Fudan University Shanghai Cancer Center, Shanghai, China; State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China; Shanghai Baihuikang Biotechnology Co., Ltd, Shanghai, China
| | - S Mei
- Fudan University Shanghai Cancer Center, Shanghai, China; State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China; Shanghai Baihuikang Biotechnology Co., Ltd, Shanghai, China
| | - B Zhou
- Fudan University Shanghai Cancer Center, Shanghai, China; State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China; Shanghai Baihuikang Biotechnology Co., Ltd, Shanghai, China
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23
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Mei S, de Souza Júnior FSN, Kuan MYS, Green NC, Espino DM. Hemodynamics through the congenitally bicuspid aortic valve: a computational fluid dynamics comparison of opening orifice area and leaflet orientation. Perfusion 2016; 31:683-690. [PMID: 27484972 DOI: 10.1177/0267659116656775] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A computational fluid dynamics model of a bicuspid aortic valve has been developed using idealised three-dimensional geometry. The aim was to compare how the orifice area and leaflet orientation affect the hemodynamics of a pure bicuspid valve. By applying physiologic material properties and boundary conditions, blood flow shear stresses were predicted during peak systole. A reduced orifice area altered blood velocity, the pressure drop across the valve and the wall shear stress through the valve. Bicuspid models predicted impaired blood flow similar to a stenotic valve, but the flow patterns were specific to leaflet orientation. Flow patterns developed in bicuspid aortic valves, such as helical flow, were sensitive to cusp orientation. In conclusion, the reduced opening area of a bicuspid aortic valve amplifies any impaired hemodynamics, but cusp orientation determines subsequent flow patterns which may determine the specific regions downstream from the valve most at risk of clinical complications.
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Affiliation(s)
- Sen Mei
- 1 School of Mechanical Engineering, University of Birmingham, Birmingham, UK.,2 Mechanical Engineering, Rice University, Houston, TX, USA
| | - Francisco S N de Souza Júnior
- 1 School of Mechanical Engineering, University of Birmingham, Birmingham, UK.,3 Centro de Tecnologia e Geociências, Universidade Federal de Pernambuco, Cidade Universitária Recife, Recife, Brasil
| | - May Y S Kuan
- 1 School of Mechanical Engineering, University of Birmingham, Birmingham, UK.,4 Cameron (Singapore) Pte. Ltd, Singapore
| | - Naomi C Green
- 1 School of Mechanical Engineering, University of Birmingham, Birmingham, UK
| | - Daniel M Espino
- 1 School of Mechanical Engineering, University of Birmingham, Birmingham, UK
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24
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Fan LH, Zhang ZJ, Mei S, Lu YY, Li M, Wang ZY, Yang JG, Yang ST, Tan TW. Engineering yeast with bifunctional minicellulosome and cellodextrin pathway for co-utilization of cellulose-mixed sugars. Biotechnol Biofuels 2016; 9:137. [PMID: 27382414 PMCID: PMC4932713 DOI: 10.1186/s13068-016-0554-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 06/23/2016] [Indexed: 05/13/2023]
Abstract
BACKGROUND Consolidated bioprocessing (CBP), integrating cellulase production, cellulose saccharification, and fermentation into one step has been widely considered as the ultimate low-cost configuration for producing second-generation fuel ethanol. However, the requirement of a microbial strain able to hydrolyze cellulosic biomass and convert the resulting sugars into high-titer ethanol limits CBP application. RESULTS In this work, cellulolytic yeasts were developed by engineering Saccharomyces cerevisiae with a heterologous cellodextrin utilization pathway and bifunctional minicellulosomes. The cell-displayed minicellulosome was two-scaffoldin derived, and contained an endoglucanase and an exoglucanase, while the intracellular cellodextrin pathway consisted of a cellodextrin transporter and a β-glucosidase, which mimicked the unique cellulose-utilization system in Clostridium thermocellum and allowed S. cerevisiae to degrade and use cellulose without glucose inhibition/repression on cellulases and mixed-sugar uptake. Consequently, only a small inoculation of the non-induced yeast cells was required to efficiently co-convert both cellulose and galactose to ethanol in a single-step co-fermentation process, achieving a high specific productivity of ~62.61 mg cellulosic ethanol/g cell·h from carboxymethyl cellulose and ~56.37 mg cellulosic ethanol/g cell·h from phosphoric acid-swollen cellulose. CONCLUSIONS Our work provides a versatile engineering strategy for co-conversion of cellulose-mixed sugars to ethanol by S. cerevisiae, and the achievements in this work may further promote cellulosic biofuel production.
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Affiliation(s)
- Li-Hai Fan
- />College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- />Beijing Key Laboratory of Bioprocess, Beijing, People’s Republic of China
| | - Zi-Jian Zhang
- />College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- />Beijing Key Laboratory of Bioprocess, Beijing, People’s Republic of China
| | - Sen Mei
- />College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- />Beijing Key Laboratory of Bioprocess, Beijing, People’s Republic of China
| | - Yang-Yang Lu
- />College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- />Beijing Key Laboratory of Bioprocess, Beijing, People’s Republic of China
| | - Mei Li
- />College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- />Beijing Key Laboratory of Bioprocess, Beijing, People’s Republic of China
| | - Zai-Yu Wang
- />College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- />Beijing Key Laboratory of Bioprocess, Beijing, People’s Republic of China
| | - Jian-Guo Yang
- />College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- />Beijing Key Laboratory of Bioprocess, Beijing, People’s Republic of China
| | - Shang-Tian Yang
- />Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH USA
| | - Tian-Wei Tan
- />College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- />Beijing Key Laboratory of Bioprocess, Beijing, People’s Republic of China
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Huertas-Company M, Gravet R, Cabrera-Vives G, Pérez-González PG, Kartaltepe JS, Barro G, Bernardi M, Mei S, Shankar F, Dimauro P, Bell EF, Kocevski D, Koo DC, Faber SM, Mcintosh DH. A CATALOG OF VISUAL-LIKE MORPHOLOGIES IN THE 5 CANDELS FIELDS USING DEEP LEARNING. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/0067-0049/221/1/8] [Citation(s) in RCA: 147] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ho M, Mei S, Schlosser K, Stewart D. IDENTIFICATION OF A SUB-FRACTION OF INDUCED PLURIPOTENT STEM CELLS WITH HIGH PROPENSITY FOR DIFFERENTIATION INTO ENDOTHELIAL CELLS. Can J Cardiol 2014. [DOI: 10.1016/j.cjca.2014.07.504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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27
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Li X, Yu K, Mei S, Huo J, Wang J, Zhu Y, Zhao Z. HLA-B*1502 increases the risk of phenytoin or lamotrigine induced Stevens-Johnson Syndrome/toxic epidermal necrolysis: evidence from a meta-analysis of nine case-control studies. Drug Res (Stuttg) 2014; 65:107-11. [PMID: 24871931 DOI: 10.1055/s-0034-1375684] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND AND STUDY AIMS Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are fatal adverse cutaneous drug reactions which may be induced by phenytoin (PHT) or lamotrigine (LTG). The objective of this study was to analyze the association of human leukocyte antigen (HLA)-B*1502 and PHT or LTG induced SJS/TEN. PATIENTS AND METHODS All the participants were epileptic patients and the SJS/TEN were induced by PHT or LTG. The presence or absence of the HLA-B*1502 allele of all the patients was determined. ISI Web of Knowledge, PubMed, ScienceDirect, EMBASE, and Cochrane Register of Controlled Trials (CENTRAL) data were searched for the literature published before April 2014. Meta-analysis was performed using Review Manager 5.2 software. RESULTS From 256 citations, 6 English studies were included that involved 480 epilepsy patients. Meta-analysis showed that odd ratio (OR) of PHT and LTG were 5.65 [95% CI: 2.76-11.57] and 4.51 [95% CI: 1.57-12.98], respectively. Funnel plot analysis showed symmetry, indicting less possible publication bias and the results were partly reliable. CONCLUSION There is a significant association between HLA-B*1502 and PHT or LTG-induced SJS/TEN.
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Affiliation(s)
- X Li
- Department of Pharmacy, Beijing Tiantan Hospital Affiliated to Capital Medical University, Beijing, China
| | - K Yu
- Department of Pharmacy, Beijing Tiantan Hospital Affiliated to Capital Medical University, Beijing, China
| | - S Mei
- Department of Pharmacy, Beijing Tiantan Hospital Affiliated to Capital Medical University, Beijing, China
| | - J Huo
- Department of Pharmacy, Beijing Tiantan Hospital Affiliated to Capital Medical University, Beijing, China
| | - J Wang
- Department of Pharmacy, Beijing Tiantan Hospital Affiliated to Capital Medical University, Beijing, China
| | - Y Zhu
- Department of Pharmacy, Beijing Tiantan Hospital Affiliated to Capital Medical University, Beijing, China
| | - Z Zhao
- Department of Pharmacy, Beijing Tiantan Hospital Affiliated to Capital Medical University, Beijing, China
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Mei S, He L, Wu X, Sun J, Wang B, Xiong X, Sun L. Dynamic investigation of interface atom migration during heterostructure nanojoining. Nanoscale 2014; 6:405-411. [PMID: 24212469 DOI: 10.1039/c3nr03911k] [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] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Interface atom migration and compositional evolution during the heterostructure nanojoining process under external electrical loadings has been investigated in situ inside a transmission electron microscope with atomic resolution. The results indicate that the migration of oxygen atoms on the contact interface of metal nanorods is a thermal dominated process rather than an electromigration process. After removing the oxide layer at the nanometal contact interface, the metal atoms migrate under external electrical field. The formation region of nanoalloys can be modulated by controlling the electromigration direction of nanometal atoms, leading to an electromigration-dominated cutting process which offers an extra degree of freedom to design a sacrifice layer and interconnects in solid-state bonding. These findings offer an insight of potential failure mechanisms as well as fabrication methodology for interconnects in nanodevices.
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Affiliation(s)
- Sen Mei
- SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, PR China.
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Bagnoli P, Ardito A, Brocchi A, Cozzaglio L, Mussi C, Mei S, Deraco M, Brusa S, Carlino C, Quagliuolo V. Cytoreductive surgery + hyperthermic intraperitoneal chemotherapy: Beginning of a demanding task in a leading cancer center. Eur J Surg Oncol 2012. [DOI: 10.1016/j.ejso.2012.07.063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Xu Y, Zhao Q, Mei S, Wang J. Genomic and transcriptomic alterations following hybridisation and genome doubling in trigenomic allohexaploid Brassica carinata × Brassica rapa. Plant Biol (Stuttg) 2012; 14:734-44. [PMID: 22309095 DOI: 10.1111/j.1438-8677.2011.00553.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Allopolyploidisation is a prominent evolutionary force that involves two major events: interspecific hybridisation and genome doubling. Both events have important functional consequences in shaping the genomic architecture of the neo-allopolyploids. The respective effects of hybridisation and genome doubling upon genomic and transcriptomic changes in Brassica allopolyploids are unresolved. In this study, amplified fragment length polymorphism (AFLP), methylation-sensitive amplification polymorphism (MSAP) and cDNA-AFLP approaches were used to track genetic, epigenetic and transcriptional changes in both allohexaploid Brassica (ArArBcBcCcCc genome) and triploid hybrids (ArBcCc genome). Results from these groups were compared with each other and also to their parents Brassica carinata (BBCC genome) and Brassica rapa (AA genome). Rapid and dramatic genetic, DNA methylation and gene expression changes were detected in the triploid hybrids. During the shift from triploidy to allohexaploidy, some of the hybridisation-induced alterations underwent reversion. Additionally, novel genetic, epigenetic and transcriptional alterations were also detected. The proportions of A-genome-specific DNA methylation and gene expression alterations were significantly greater than those of BC-genome-specific alterations in the triploid hybrids. However, the two parental genomes were equally affected during the ploidy shift. Hemi-CCG methylation changes induced by hybridisation were recovered after genome doubling. Full-CG methylation changes were a more general process initiated in the hybrid and continued after genome doubling. These results indicate that genome doubling could ameliorate genomic and transcriptomic alterations induced by hybridisation and instigate additional alterations in trigenomic Brassica allohexaploids. Moreover, genome doubling also modified hybridisation-induced progenitor genome-biased alterations and epigenetic alteration characteristics.
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Affiliation(s)
- Y Xu
- Key Laboratory of the MOE for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan, China Engineering Research Center of Wetland Agriculture in the Middle Reaches of the Yangtze River, Ministry of Education, College of Agriculture, Yangtze University, Jingzhou, Hubei, China Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Q Zhao
- Key Laboratory of the MOE for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan, China Engineering Research Center of Wetland Agriculture in the Middle Reaches of the Yangtze River, Ministry of Education, College of Agriculture, Yangtze University, Jingzhou, Hubei, China Hubei Academy of Agricultural Sciences, Wuhan, China
| | - S Mei
- Key Laboratory of the MOE for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan, China Engineering Research Center of Wetland Agriculture in the Middle Reaches of the Yangtze River, Ministry of Education, College of Agriculture, Yangtze University, Jingzhou, Hubei, China Hubei Academy of Agricultural Sciences, Wuhan, China
| | - J Wang
- Key Laboratory of the MOE for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan, China Engineering Research Center of Wetland Agriculture in the Middle Reaches of the Yangtze River, Ministry of Education, College of Agriculture, Yangtze University, Jingzhou, Hubei, China Hubei Academy of Agricultural Sciences, Wuhan, China
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Cimini A, Mei S, Benedetti E, Laurenti G, Koutris I, Cinque B, Cifone MG, Galzio R, Pitari G, Di Leandro L, Giansanti F, Lombardi A, Fabbrini MS, Ippoliti R. Distinct cellular responses induced by saporin and a transferrin-saporin conjugate in two different human glioblastoma cell lines. J Cell Physiol 2012; 227:939-51. [PMID: 21503892 DOI: 10.1002/jcp.22805] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Glioblastoma multiforme (GBM) is the most common primary brain tumour in adults, with a median survival of ~12-18 months post-diagnosis. GBM usually recurs within 12 months post-resection, with poor prognosis. Thus, novel therapeutic strategies to target and kill GBM cells are urgently needed. The marked difference of tumour cells with respect to normal brain cells renders glioblastoma a good candidate for selective targeted therapies. Recent experimental strategies focus on over expressed cell surface receptors. Targeted toxins represent a new class of selective molecules composed by a potent protein toxin and a carrier ligand. Targeted toxins approaches against glioblastoma were under investigation in phase I and II clinical trials with several immunotoxins (IT)/ligand toxins such as IL4-Pseudomonas aeruginosa exotoxin A (IL4-PE, NBI-3001), tumour growth factor fused to PE38, a shorter PE variant, (TGF)alpha-TP-38, IL13-PE38, and a transferrin-C diphtheriae toxin mutant (Tf-CRM107). In this work, we studied the effects of the plant ribosome-inactivating saporin and of its chimera transferrin-saporin against two different GBM cell lines. The data obtained here indicate that cell proliferation is affected by the toxin treatments but that different mechanisms are used, directly linked to the presence of an active or inactive p53. A model is proposed for these alternative intracellular pathways.
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Affiliation(s)
- A Cimini
- Department of Basic and Applied Biology, University of L'Aquila, L'Aquila, Italy
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Galzio R, Rosati F, Benedetti E, Cristiano L, Aldi S, Mei S, D'Angelo B, Gentile R, Laurenti G, Cifone MG, Giordano A, Cimini A. Glycosilated nucleolin as marker for human gliomas. J Cell Biochem 2012; 113:571-9. [PMID: 21938743 DOI: 10.1002/jcb.23381] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Nucleolin is a multifunctional DNA and RNA binding protein involved in regulation of gene transcription, chromatin remodeling, RNA metabolism, and ribosomal RNA synthesis. Nucleolin seems to be over-expressed in highly proliferative cells and is involved in many aspect of gene expression: DNA recombination and replication, RNA transcription by RNA polymerase I and II, rRNA processing, mRNA stabilization, cytokinesis, and apoptosis. Although nucleolin is localized predominantly in the nucleolus, it has also been shown to be localized in a phosphorylated/glycolsilated form on the cell surface of different cells. Numerous articles dealing with surface nucleolin targeting for tumor therapy have been recently published. However, at present, no extensive informations are so far available for the presence of nucleolin in human gliomas. In the present work we investigated on the presence and localization of nucleolin in glioma on glioma specimens at different grade of malignancy and on primary glioma cell cultures derived by surgical resection, trying to correlate the presence of glycosilated membrane nucleolin with the malignancy grade. To this purpose an antibody produced by us against gp273 protein, demonstrated to recognized the glycosilated surface nucleolin, has been used. The results obtained demonstrate that surface nucleolin increase with the malignancy grade thus suggesting that it may constitute a histopathological marker for glioma grading and a possible tool for targeted therapy.
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Affiliation(s)
- R Galzio
- Department of Health Sciences, University of L'Aquila, L'Aquila, Italy
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Pellegrino M, Taddeucci P, Peccianti C, Mei S, Fioravanti A, Fimiani M. Etanercept induced hidradenitis suppurativa. GIORN ITAL DERMAT V 2011; 146:503-504. [PMID: 22095184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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34
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Romano C, Taddeucci P, Mei S, Fimiani M. Solitary nodule on left lower back. GIORN ITAL DERMAT V 2011; 146:243-244. [PMID: 21566554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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35
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Zhu D, Yu B, Ju C, Mei S, Chen D. Effect of high dietary copper on the expression
of hypothalamic appetite regulators in weanling pigs. J Anim Feed Sci 2011. [DOI: 10.22358/jafs/66158/2011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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36
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Pellegrino M, Taddeucci P, Mei S, Peccianti C, Fimiani M. Chondrodermatitis nodularis chronica helicis and photodynamic therapy: a new therapeutic option? Dermatol Ther 2011; 24:144-7. [DOI: 10.1111/j.1529-8019.2010.01389.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Quercetani R, Rebora AE, Fedi MC, Carelli G, Mei S, Chelli A, Poli E. Patients with profuse hair shedding may reveal anagen hair dystrophy: a diagnostic clue of alopecia areata incognita. J Eur Acad Dermatol Venereol 2010; 25:808-10. [PMID: 20946585 DOI: 10.1111/j.1468-3083.2010.03869.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Several patients, especially women, seek advice because of hair loss. They may be diagnosed clinically as having telogen effluvium (TE) or androgenetic alopecia (AGA), but histopathology may reveal that a proportion of them have in fact alopecia areata incognita (AAI). OBJECTIVES To detect dystrophic anagen hairs in such patients. METHODS We studied 1932 patients with hair loss and no signs of classical alopecia areata. They were submitted to the modified wash test (which counts the total number of telogen hairs lost and the percentage of vellus hairs) and divided into patients having pure TE (403), patients with AGA+TE (1235) and patients with pure AGA (294). Dystrophic hairs were detected with a low magnification microscope. RESULTS Dystrophic hairs were observed in 13 patients with TE (3.2%), in 54 with AGA+TE (4.4%) and in none with AGA. In addition, 7 patients with TE and 32 with AGA+TE developed small patches of alopecia areata in 6 to 9 weeks. No patches developed in patients with AGA. CONCLUSIONS The presence of dystrophic hairs and the development of patches of alopecia areata (and their absence in pure AGA) provide a first evidence of the possibility that within the heterogenous condition named TE some patients have in fact AAI.
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Affiliation(s)
- R Quercetani
- Division of Dermatology, I.F.C.A. GRUPPO G.I.O.M.I., Florence, Italy
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Mei S, Suzuki AM, Kohlstedt DL, Dixon NA, Durham WB. Experimental constraints on the strength of the lithospheric mantle. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jb006873] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Jackson MJ, Robinson GM, Ali N, Kousar Y, Mei S, Gracio J, Taylor H, Ahmed W. Surface engineering of artificial heart valve disks using nanostructured thin films deposited by chemical vapour deposition and sol-gel methods. J Med Eng Technol 2007; 30:323-9. [PMID: 16980288 DOI: 10.1080/03091900500441287] [Citation(s) in RCA: 12] [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] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Pyrolytic carbon (PyC) is widely used in manufacturing commercial artificial heart valve disks (HVD). Although PyC is commonly used in HVD, it is not the best material for this application since its blood compatibility is not ideal for prolonged clinical use. As a result thrombosis often occurs and the patients are required to take anti-coagulation drugs on a regular basis in order to minimize the formation of thrombosis. However, anti-coagulation therapy gives rise to some detrimental side effects in patients. Therefore, it is extremely urgent that newer and more technically advanced materials with better surface and bulk properties are developed. In this paper, we report the mechanical properties of PyC-HVD, i.e. strength, wear resistance and coefficient of friction. The strength of the material was assessed using Brinell indentation tests. Furthermore, wear resistance and coefficient of friction values were obtained from pin-on-disk testing. The micro-structural properties of PyC were characterized using XRD, Raman spectroscopy and SEM analysis. Also in this paper we report the preparation of freestanding nanocrystalline diamond films (FSND) using the time-modulated chemical vapour deposition (TMCVD) process. Furthermore, the sol-gel technique was used to uniformly coat PyC-HVD with dense, nanocrystalline-titanium oxide (nc-TiO2) coatings. The as-grown nc-TiO2 coatings were characterized for microstructure using SEM and XRD analysis.
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Affiliation(s)
- M J Jackson
- Birck Nanotechnology Center and College of Technology, Purdue University, West Lafayette, IN 47907-2021, USA.
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Nakagawa K, Holla VR, Wei Y, Wang WH, Gatica A, Wei S, Mei S, Miller CM, Cha DR, Price E, Zent R, Pozzi A, Breyer MD, Guan Y, Falck JR, Waterman MR, Capdevila JH. Does Malfunction of Arachidonic Acid Epoxygenase Explain Salt-Sensitive Hypertension? J Am Soc Nephrol 2006; 17:2345-2352. [PMID: 37000980 DOI: 10.1681/01.asn.0000926848.81018.f7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2023] Open
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Affiliation(s)
- L Amato
- Department of Dermatology, University of Florence, Florence, Italy
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Qiu L, Hu X, Zhou Y, Mei S, Nguyen KB, Pang Y. Steinernema akhursti sp. n. (Nematoda: Steinernematidae) from Yunnan, China. J Invertebr Pathol 2005; 90:151-60. [PMID: 16289544 DOI: 10.1016/j.jip.2005.09.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2004] [Revised: 05/05/2005] [Accepted: 09/02/2005] [Indexed: 10/25/2022]
Abstract
A new species of entomopathogenic nematode, herein described as Steinernema akhursti sp. n., was recovered from soil samples collected from Yunnan Province, the People's Republic of China. Both morphological and molecular data show congruently that S. akhursti sp. n. belongs to the Steinernema feltiae group. It can be separated from all described Steinernema species by the combined morphological and morphometrical characters of various stages of the nematodes. For the first generation male, the new species can be recognized by spicule length 90 +/- 4.6 microm, spicule tip blunt with an aperture on the ventral side, gubernaculum with a long and needle-shaped cuneus, and tail conoid with a prominent mucron on the tip and a concave on ventral side. For the infective juvenile, the combination of the following characters: body length 812 +/- 19 microm, distance from anterior end to excretory pore 59 +/- 1.5 microm, tail length 73 +/- 2.9 microm, E% 77 +/- 4.5, lateral field with six evenly distributed and identical ridges at the middle body portion, and tail with long and slightly constrict hyaline portion can be used to separate the new species from other nematodes. For the female, the new species is characterized by: tail conoid with a short mucron and slightly swelling anal portion and a symmetrical, slightly protruding vulva with conspicuous double-flapped epiptygma. The nematode can be separated from other described species of Steinernema by DNA sequences of either a partial 28S rDNA or the internal transcribed spacer regions of rDNA and from the closely related species S. feltiae and Steinernema oregonense by cross-breeding tests.
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Affiliation(s)
- L Qiu
- State Key Laboratory for Biocontrol, Zhongshan University, Guangzhou 510275, People's Republic of China.
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Yang J, Mei S, Ferreira JMF, Norby P, Quaresmâ S. Fabrication of rutile rod-like particle by hydrothermal method: an insight into HNO3 peptization. J Colloid Interface Sci 2005; 283:102-6. [PMID: 15694429 DOI: 10.1016/j.jcis.2004.08.109] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2004] [Accepted: 08/13/2004] [Indexed: 10/25/2022]
Abstract
In this work, well-crystallized and well-dispersed rod-like TiO(2) rutile particles were prepared by hydrothermally treating acid-peptized TiO(2) sols at relatively low temperatures of 200 and 240 degrees C. Raman spectra, transmission electron microscopy (TEM), and X-ray diffraction (XRD) were used to characterize the peptized sols before and after hydrothermal treatment. The results showed that HNO(3) peptization of amorphous TiO(2) was able to promote, at room temperature, the formation of crystalline phases of anatase or rutile, at low (HNO(3)/Ti=1) or at high (HNO(3)/Ti=4) concentrations of peptizer, respectively. However, after hydrothermal treatment, well-crystalline rutile developed independent of the starting concentration of the peptizer. The formation of well-dispersed rutile particles is attributed to high long-range electrostatic forces between particles in the presence of the high concentration of the peptizer. The acid peptization would easily break the oxolation bonds between triple bond Ti-O-Ti triple bond, promote the formation of titanium species with fewer oxolation bonds depending on the amount of acid, and create conditions for the formation of rutile nuclei after structural rearrangements.
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Affiliation(s)
- Juan Yang
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway.
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Xu X, Mei S, Ferreira JMF, Nishimura T, Hirosaki N. Temperature-induced gelation of concentrated silicon carbide suspensions. J Colloid Interface Sci 2004; 277:111-5. [PMID: 15276046 DOI: 10.1016/j.jcis.2004.04.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2004] [Accepted: 04/12/2004] [Indexed: 10/26/2022]
Abstract
Due to the steric barrier provided by the adsorption of the dispersant hypermer KD1 (a polyester/polyamine condensation polymer), stable and low-viscosity suspensions of SiC, Y(2)O(3), and Al(2)O(3) powder mixtures could be prepared in methyl ethyl ketone (MEK)/ethanol (E) solvent with solids loading as high as 60 vol%. The solvency of the dispersant in MEK/E decreased dramatically on cooling. Steady shear viscosity and oscillatory measurements were performed as a function of temperature for suspensions with different solids loading. The viscosity and elastic modulus of suspension increased with decreasing temperature and became more sensitive with the increase of solids loading. The suspensions with solids loading higher than 40 vol% could be solidified with decreasing temperature, but gelation temperature and gelation stiffness decreased with decreasing solids loading. The 60 vol% solid-loaded suspension was a stable and free-flowing fluid at 20 degrees C and gradually transformed to a very highly viscous and elastic system upon cooling to about 13 degrees C. Complete solidification occurred when the temperature was decreased to 5 degrees C. The gelation mechanism was mainly based on the collapse of the adsorbed layer as the temperature decreases, which induced incipient flocculation and formed a stiff network. The gelled body was further strengthened by separation of the dispersant from the suspension.
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Affiliation(s)
- X Xu
- Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
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Abstract
Weakly flocculated aqueous anatase suspensions were prepared in situ by hydrothermally treating amorphous titania particles peptized with different amounts of tetraethylammonium hydroxide (TENOH). The simultaneous formation of hydrous TiO2 polyanions in the presence of OH- and tetraethylammonium cations are two essential conditions for the peptization process to occur. The absence of either of these conditions will cause reprecipitation. Transmission electron microscopy (TEM) revealed that the morphology of the particles formed at low TENOH concentrations consisted of well-dispersed anatase crystals, changing to asterisk-like structured particles with increasing concentrations of TENOH. Because of the extremely high absolute zeta potential (over -70 mV in all the samples) and ionic strength values, nontouching particle networks may be formed in situ in the mother solution in all samples, as predicted by DLVO theory. A trend to coagulation was observed in the suspensions with increasing concentrations of TENOH due to a more pronounced secondary minimum in the particle pair potential curves. Assuming the particles remained in the secondary minimum throughout the hydrothermal treatment may lead to the formation of the asterisk-like hard agglomerates. This may arise from the condensation of the -OH-rich TiO2 particles or from the deposition of material in the interparticle gap during the particle growth process. The green packing density of slip-cast bodies from a suspension containing 20 wt% solids was around 46%.
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Affiliation(s)
- Juan Yang
- Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
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Amato L, Mei S, Massi D, Gallerani I, Fabbri P. Cicatricial alopecia; a dermatopathologic and immunopathologic study of 33 patients (pseudopelade of Brocq is not a specific clinico-pathologic entity). Int J Dermatol 2002; 41:8-15. [PMID: 11895507 DOI: 10.1046/j.1365-4362.2002.01331.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [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: 11/20/2022]
Abstract
BACKGROUND Pseudopelade of Brocq (PB) is a permanent progressive scarring alopecia characterized by numerous alopecic patches localized only in the scalp, that tend to coalesce into larger, irregular plaques with policyclic borders. PB can be considered either the final atrophic stage of several scarring disorders such as lichen planus pilaris (LPP) and discoid lupus erythematosus (DLE) (secondary PB) or an autonomous disease (primary PB). The aim of this study was to assess the incidence of primary vs. secondary PB by a combined histopathological and immunopathological study in a series of patients who fulfilled the clinical diagnostic criteria for PB set forth by Braun Falco et al. METHODS We studied 33 patients (5 males and 28 females, whose age ranged from 24 to 75 years). The duration of the disease (from onset to biopsy) ranged from 3 months to 8 years. Serum samples were tested for circulating auto-antibodies (antinuclear antibodies anti ENA, anticentromere, anti-Scl70, antithyroid, antigastric parietal cells) circulating immune complexes, total and single fraction (C3, C4) complement activity. The skin biopsies taken from the active advancing margin of the more recent alopecic patch were bisected vertically, one was sent for histopathological examination, and the other for the immunofluorescence studies. RESULTS In all patients the serum tests above were found to be negative or normal. Histopathologically, 11 biopsies (33.3%) displayed findings typical for LPP whereas seven cases (21.2%) showed typical DLE features. In the remaining 15 cases (45.5%) histopathological findings were not suggestive of any specific dermatosis. DIF investigations showed findings typical of LPP in six cases (18.1%) and typical of DLE in seven cases (21%). In three cases we did not find findings typical of LPP, DLE, or any other specific dermatitis. In 11 cases no immunological deposits could be detected and therefore were classified as negative. CONCLUSION In conclusion, PB is a type of scarring alopecia of the scalp associated with a peculiar clinical presentation and evolution, which cannot be considered an autonomous nosologic entity because in 66.6% of patients it is the end stage of other inflammatory chronic diseases such as LPP and DLE. It is conceivable that even in those cases in which the histopathological and immunopathological findings did not allow for a specific diagnosis, LPP and DLE were also involved. It is noteworthy that in our study the histopathological and the immunopathological examinations did not conflict and often the results were even coincidental, thus confirming the compatibility of the combined histo-immunopathological approach in the diagnostic evaluation of PB.
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Affiliation(s)
- L Amato
- Department of Dermatological Sciences, University of Florence, Florence, Italy
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Yang J, Mei S, Ferreira J. Hydrothermal synthesis of TiO2 nanopowders from tetraalkylammonium hydroxide peptized sols. Materials Science and Engineering: C 2001. [DOI: 10.1016/s0928-4931(01)00274-0] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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