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Wang SY, Zhang SJ, Meng HF, Xu HQ, Guo ZX, Yan JF, Gao JL, Niu LN, Wang SL, Jiao K. DPSCs regulate epithelial-T cell interactions in oral submucous fibrosis. Stem Cell Res Ther 2024; 15:113. [PMID: 38650025 PMCID: PMC11036714 DOI: 10.1186/s13287-024-03720-5] [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] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Accepted: 04/07/2024] [Indexed: 04/25/2024] Open
Abstract
BACKGROUND Oral submucous fibrosis (OSF) is a precancerous lesion characterized by fibrous tissue deposition, the incidence of which correlates positively with the frequency of betel nut chewing. Prolonged betel nut chewing can damage the integrity of the oral mucosal epithelium, leading to chronic inflammation and local immunological derangement. However, currently, the underlying cellular events driving fibrogenesis and dysfunction are incompletely understood, such that OSF has few treatment options with limited therapeutic effectiveness. Dental pulp stem cells (DPSCs) have been recognized for their anti-inflammatory and anti-fibrosis capabilities, making them promising candidates to treat a range of immune, inflammatory, and fibrotic diseases. However, the application of DPSCs in OSF is inconclusive. Therefore, this study aimed to explore the pathogenic mechanism of OSF and, based on this, to explore new treatment options. METHODS A human cell atlas of oral mucosal tissues was compiled using single-cell RNA sequencing to delve into the underlying mechanisms. Epithelial cells were reclustered to observe the heterogeneity of OSF epithelial cells and their communication with immune cells. The results were validated in vitro, in clinicopathological sections, and in animal models. In vivo, the therapeutic effect and mechanism of DPSCs were characterized by histological staining, immunohistochemical staining, scanning electron microscopy, and atomic force microscopy. RESULTS A unique epithelial cell population, Epi1.2, with proinflammatory and profibrotic functions, was predominantly found in OSF. Epi1.2 cells also induced the fibrotic process in fibroblasts by interacting with T cells through receptor-ligand crosstalk between macrophage migration inhibitory factor (MIF)-CD74 and C-X-C motif chemokine receptor 4 (CXCR4). Furthermore, we developed OSF animal models and simulated the clinical local injection process in the rat buccal mucosa using DPSCs to assess their therapeutic impact and mechanism. In the OSF rat model, DPSCs demonstrated superior therapeutic effects compared with the positive control (glucocorticoids), including reducing collagen deposition and promoting blood vessel regeneration. DPSCs mediated immune homeostasis primarily by regulating the numbers of KRT19 + MIF + epithelial cells and via epithelial-stromal crosstalk. CONCLUSIONS Given the current ambiguity surrounding the cause of OSF and the limited treatment options available, our study reveals that epithelial cells and their crosstalk with T cells play an important role in the mechanism of OSF and suggests the therapeutic promise of DPSCs.
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Affiliation(s)
- S Y Wang
- Department of Stomatology, Tangdu Hospital & State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & School of Stomatology, The Fourth Military Medical University, 169 West Changle Road, Xincheng District, 710032, Xi'an, Shaanxi, P. R. China
| | - S J Zhang
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, 169 West Changle Road, Xincheng District, 710032, Xi'an, Shaanxi, P. R. China
| | - H F Meng
- Beijing SH Bio-tech Co., 100071, Beijing, P.R. China
| | - H Q Xu
- Department of Stomatology, Tangdu Hospital & State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & School of Stomatology, The Fourth Military Medical University, 169 West Changle Road, Xincheng District, 710032, Xi'an, Shaanxi, P. R. China
- The College of Life Science, Northwest University, 710032, Xi'an, Shaanxi, P.R. China
| | - Z X Guo
- Department of Stomatology, Tangdu Hospital & State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & School of Stomatology, The Fourth Military Medical University, 169 West Changle Road, Xincheng District, 710032, Xi'an, Shaanxi, P. R. China
| | - J F Yan
- Department of Stomatology, Tangdu Hospital & State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & School of Stomatology, The Fourth Military Medical University, 169 West Changle Road, Xincheng District, 710032, Xi'an, Shaanxi, P. R. China
| | - J L Gao
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, 169 West Changle Road, Xincheng District, 710032, Xi'an, Shaanxi, P. R. China
| | - L N Niu
- State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, 169 West Changle Road, Xincheng District, 710032, Xi'an, Shaanxi, P. R. China.
| | - S L Wang
- Beijing Laboratory of Oral Health, Capital Medical University, 10 Xitoutiao, Fengtai District, 100069, Beijing, P.R. China.
- Laboratory of Homeostatic Medicine, School of Medicine, Southern University of Science and Technology, No. 1088 Xueyuan Avenue, Nanshan District, 518055, Shenzhen, P.R. China.
| | - K Jiao
- Department of Stomatology, Tangdu Hospital & State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration & School of Stomatology, The Fourth Military Medical University, 169 West Changle Road, Xincheng District, 710032, Xi'an, Shaanxi, P. R. China.
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Yao J, Gao J, Yan JF, Fang S. Cardiac contractility modulation and subcutaneous defibrillator (S-ICD): First experience with simultaneous implantation. Pacing Clin Electrophysiol 2023; 46:1595-1598. [PMID: 36938703 DOI: 10.1111/pace.14695] [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: 11/18/2022] [Revised: 01/08/2023] [Accepted: 03/07/2023] [Indexed: 03/21/2023]
Abstract
BACKGROUNDS Two technologies, cardiac contractility modulation (CCM) and subcutaneous implantable cardioverter-defibrillator (S-ICD), can be successfully combined and applied to patients with advanced heart failure (HF) with reduced left ventricular ejection fraction (LVEF). CASE REPORT We reported a case of a 51-year-old man with reduced ejection fraction (LVEF = 33%) and a narrow QRS complex who first underwent simultaneous implantation of CCM and S-ICD. CONCLUSION Our case report aimed to reveal that the simultaneous implantation of CCM and S-ICD could be successfully used in patients with advanced HF, which could significantly improve the clinical symptoms of such patients during one surgery.
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Affiliation(s)
- Juan Yao
- Cardiology Department, People's Hospital of Xinjiang Uygur Autonomous Region, Urumqi, China
| | - Jie Gao
- Cardiology Department, People's Hospital of Xinjiang Uygur Autonomous Region, Urumqi, China
| | - Jian-Feng Yan
- Cardiology Department, People's Hospital of Xinjiang Uygur Autonomous Region, Urumqi, China
| | - Shu Fang
- Cardiology Department, People's Hospital of Xinjiang Uygur Autonomous Region, Urumqi, China
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Li XY, Zhang TY, Zhang ZH, Tao LQ, Huang ZY, Yan JF, Zhao X, Zhao XY, Li Y, Wu XH, Yin L, Yuan Y, Guo JM. Conversion of THz refractive index variation to detectable voltage change realized by a graphene-based Brewster angle device. Opt Express 2023; 31:23693-23701. [PMID: 37475448 DOI: 10.1364/oe.493453] [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: 04/17/2023] [Accepted: 06/14/2023] [Indexed: 07/22/2023]
Abstract
The Brewster effect has been previously reported as an essential mechanism for terahertz (THz) wave sensing application. However, generally in a sensing application, a complex rotation apparatus is required for detecting the slight change in Brewster angle. Here, we propose a graphene-based Brewster angle device operating at a specific terahertz frequency capable of sensing the refractive index at a fixed incident angle. In other words, our sensing device could avoid the impact of Brewster angle shift and eliminate the need for high-precision rotating equipment, which is usually required in traditional sensing applications. The conversion from the refractive index to a Volt-level detectable voltage roots from the tunability of graphene's Fermi level in the external electrical field. A linear correlation between the output voltage and the background refractive index is observed and theocratically analyzed. Furthermore, we present the improvement of our device in terms of sensing range and sensitivity by adjusting the permittivity of the dielectric substrate. As a demonstration of our proposed device, a detection range of 1.1-2.4 and a sensitivity of 20.06 V/RIU for refractive index is achieved on a high-resistance silicon substrate operating at 0.3 THz.
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Xu SN, Zheng Y, Ye JY, Chen ZY, Yan JF, Geng YH, Hong W, Yuan YF. Conductance of o-carborane-based wires with different substitution patterns. Dalton Trans 2023; 52:4349-4354. [PMID: 36916817 DOI: 10.1039/d3dt00011g] [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: 03/05/2023]
Abstract
Here, we report the synthesis, structure, and single-molecule conductance of three o-carborane-based molecular wires (ortho-, meta- and para-CN) with multiple conduction channels. The effect of connectivity in target wires compared with the corresponding phenyl-centered wires was studied using the scanning tunneling microscope break junction (STM-BJ) technique and theoretical calculations. Interestingly, the three-dimensional structure in o-carborane-based wires can effectively promote the through-space transmission paths or the formation of stable molecular junctions compared to the corresponding phenyl-centered wires. Moreover, the significant conductance difference of o-carborane-based wires was due to the combination of multiple conduction channels and quantum interference. Understanding the effects of different bridging groups and anchor group substitution patterns provides guidelines for designing o-carborane-based multichannel molecular wires.
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Affiliation(s)
- Shi-Nuo Xu
- Department of Chemistry, Fuzhou University, Fuzhou 350108, China.
| | - Yan Zheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
| | - Jing-Yao Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
| | - Zhong-Yang Chen
- Department of Chemistry, Fuzhou University, Fuzhou 350108, China.
| | - Jian-Feng Yan
- Department of Chemistry, Fuzhou University, Fuzhou 350108, China.
| | - Yan-Hou Geng
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou 350207, China.,School of Materials Science and Engineering and Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin 300072, China.
| | - Wenjing Hong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
| | - Yao-Feng Yuan
- Department of Chemistry, Fuzhou University, Fuzhou 350108, China.
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Li Y, Zhang TY, Zhang ZH, Yan JF, Zhao X, Zhao XY, Li XY, Wu XH, Yin L, Yuan Y, Guo JM. Chemometrics applied quantitative analysis of iron oxide mixtures by terahertz spectroscopy. Appl Opt 2023; 62:1167-1174. [PMID: 36821214 DOI: 10.1364/ao.481383] [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: 11/18/2022] [Accepted: 01/07/2023] [Indexed: 06/18/2023]
Abstract
A quantitative analysis method for corrosion products based on terahertz spectroscopy is proposed in this paper. Mixture samples consisting of three major corrosion products (magnetite, hematite, and goethite) were prepared in 51 different concentrations. The refractive index spectra measured by terahertz time-domain spectroscopy were projected to the 2D score diagram by performing principal component analysis. The Euclidean distances between the mixtures and pure analyte on the diagram were used to build a concentration prediction model. The results indicate that the established model can precisely predict the concentration of magnetite, which is essential for a stability evaluation of the corrosion system.
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Zhu XZ, Hu HD, Chen S, Li Y, Yan JF, Yuan Y. Nonlinear Properties of Benzothiadiazole-based Intramolecular Charge-Transfer Compounds. NEW J CHEM 2023. [DOI: 10.1039/d2nj06157k] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Intramolecular charge-transfer (ICT) chromophores have received a lot of attention due to their wide range of applications in nonlinear optical materials. In this work, we introduced the electron-rich benzothiadiazole group...
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Wei JW, Fu SR, Zhang J, Gu DS, Li XQ, Chen XD, Zhang ST, He XF, Yan JF, Lu LG, Tian J. CT-based radiomics to predict development of macrovascular invasion in hepatocellular carcinoma: A multicenter study. Hepatobiliary Pancreat Dis Int 2022; 21:325-333. [PMID: 34674948 DOI: 10.1016/j.hbpd.2021.09.011] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 09/24/2021] [Indexed: 02/05/2023]
Abstract
BACKGROUND Macrovascular invasion (MaVI) occurs in nearly half of hepatocellular carcinoma (HCC) patients at diagnosis or during follow-up, which causes severe disease deterioration, and limits the possibility of surgical approaches. This study aimed to investigate whether computed tomography (CT)-based radiomics analysis could help predict development of MaVI in HCC. METHODS A cohort of 226 patients diagnosed with HCC was enrolled from 5 hospitals with complete MaVI and prognosis follow-ups. CT-based radiomics signature was built via multi-strategy machine learning methods. Afterwards, MaVI-related clinical factors and radiomics signature were integrated to construct the final prediction model (CRIM, clinical-radiomics integrated model) via random forest modeling. Cox-regression analysis was used to select independent risk factors to predict the time of MaVI development. Kaplan-Meier analysis was conducted to stratify patients according to the time of MaVI development, progression-free survival (PFS), and overall survival (OS) based on the selected risk factors. RESULTS The radiomics signature showed significant improvement for MaVI prediction compared with conventional clinical/radiological predictors (P < 0.001). CRIM could predict MaVI with satisfactory areas under the curve (AUC) of 0.986 and 0.979 in the training (n = 154) and external validation (n = 72) datasets, respectively. CRIM presented with excellent generalization with AUC of 0.956, 1.000, and 1.000 in each external cohort that accepted disparate CT scanning protocol/manufactory. Peel9_fos_InterquartileRange [hazard ratio (HR) = 1.98; P < 0.001] was selected as the independent risk factor. The cox-regression model successfully stratified patients into the high-risk and low-risk groups regarding the time of MaVI development (P < 0.001), PFS (P < 0.001) and OS (P = 0.002). CONCLUSIONS The CT-based quantitative radiomics analysis could enable high accuracy prediction of subsequent MaVI development in HCC with prognostic implications.
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Affiliation(s)
- Jing-Wei Wei
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China; Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Si-Rui Fu
- Zhuhai Interventional Medical Center, Zhuhai Precision Medical Center, Zhuhai People's Hospital, Zhuhai Hospital of Jinan University, Zhuhai 519000, China
| | - Jie Zhang
- Department of Radiology, Zhuhai Precision Medical Center, Zhuhai People's Hospital, Zhuhai Hospital of Jinan University, Zhuhai 519000, China
| | - Dong-Sheng Gu
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China; Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiao-Qun Li
- Department of Interventional Treatment, Zhongshan City People's Hospital, Zhongshan 528400, China
| | - Xu-Dong Chen
- Department of Radiology, Shenzhen People's Hospital, Shenzhen 518000, China
| | - Shuai-Tong Zhang
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China; Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiao-Fei He
- Interventional Diagnosis and Treatment Department, Nanfang Hospital, Southern Medical University, Guangzhou, 510000, China
| | - Jian-Feng Yan
- Department of Radiology, Yangjiang People's Hospital, Yangjiang 529500, China
| | - Li-Gong Lu
- Zhuhai Interventional Medical Center, Zhuhai Precision Medical Center, Zhuhai People's Hospital, Zhuhai Hospital of Jinan University, Zhuhai 519000, China.
| | - Jie Tian
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China; Beijing Key Laboratory of Molecular Imaging, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China; Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Medicine and Engineering, Beihang University, Beijing 100191, China; Engineering Research Center of Molecular and Neuro Imaging of Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an 710126, China.
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Miao Z, Shen J, Zhang FQ, Hu K, Hou XR, Lian X, Sun S, Yan JF, Liu ZK. [The relationship between HPV integration and prognosis of cervical cancer]. Zhonghua Zhong Liu Za Zhi 2021; 42:1014-1019. [PMID: 33342157 DOI: 10.3760/cma.j.cn112152-20191031-00705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the relationship between human papillomavirus (HPV) integration and prognosis of cervical cancer patients. Methods: The data of 82 patients with cervical cancer treated in the Radiotherapy Department of Peking Union Medical College Hospital from October 2004 to June 2012 were retrospectively analyzed.The patients were divided into poor prognosis group (recurrence or metastasis after surgery and adjuvant radiotherapy) and good prognosis group based on a propensity score matching strategy.The HPV integration of the two groups were detected by whole exome sequencing to determine whether the integration sites were located in the common fragile sites (CFSs). HPV integration and integration into CFSs were compared between the two groups. Results: Among the enrolled 82 patients, 37 were divided in poor survival group and 45 in good survival group. A total of 90 integration breakpoints were identified, 30 of them occurred in poor prognosis group and 60 occurred in good prognosis group. In the poor prognosis group, HPV integration occurred in 20 patients, 13 of them were inserted in CFSs of 11 patients, and the numbers in good prognosis group were 26, 17, 11, respectively. There were no significantly statistical differences in the number of HPV integration events (P=0.289), HPV integration patients (P=0.735), CFSs integration events (P=0.427), and CFSs integration patients (P=0.591) between the two groups. In poor prognosis group, more CFSs integration events occurred in patients with metastasis than those in patients with only local recurrence (9 vs 2, P=0.003). Conclusions: No significant differences are observed in HPV integration and HPV integration into CFSs between cervical cancer patients with different prognoses. HPV integration into CFSs may be associated with distant metastasis.
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Affiliation(s)
- Z Miao
- Department of Radiation Oncology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - J Shen
- Department of Radiation Oncology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - F Q Zhang
- Department of Radiation Oncology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - K Hu
- Department of Radiation Oncology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - X R Hou
- Department of Radiation Oncology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - X Lian
- Department of Radiation Oncology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - S Sun
- Department of Radiation Oncology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - J F Yan
- Department of Radiation Oncology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Z K Liu
- Department of Radiation Oncology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
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Yan JF, Men RX, Chen XX, Lin CX, Nockemann P, Yuan YF. D–π–A type ferrocene-substituted azobenzene photochromic switches: synthesis, structures, and electrochemical and photoisomerization studies. NEW J CHEM 2021. [DOI: 10.1039/d1nj03894j] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of D–π–A type azobenzenes with a ferrocenyl/ferrocenylethynyl electron donor at the para/meta-position have been synthesized and characterized by electrochemistry and UV-vis spectroscopy.
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Affiliation(s)
- Jian-Feng Yan
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University), Department of Chemistry, Fuzhou University, Fuzhou 350108, China
| | - Rui-Xi Men
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University), Department of Chemistry, Fuzhou University, Fuzhou 350108, China
| | - Xiao-Xiao Chen
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University), Department of Chemistry, Fuzhou University, Fuzhou 350108, China
| | - Cai-Xia Lin
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University), Department of Chemistry, Fuzhou University, Fuzhou 350108, China
| | - Peter Nockemann
- School of Chemistry and Chemical Engineering, Queen's University of Belfast, The QUILL Research Centre, Belfast BT9 5AQ, UK
| | - Yao-Feng Yuan
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University), Department of Chemistry, Fuzhou University, Fuzhou 350108, China
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
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Abstract
Abnormal subchondral bone remodeling plays important roles during osteoarthritis (OA) pathology. Recent studies show that bone marrow mesenchymal stem cells (BMSCs) in osteoarthritic subchondral bones exhibit a prominent pro-osteoclastic effect that contributes to abnormal subchondral bone remodeling; however, the pathologic mechanism remains unclear. In the present study, we used a mouse model with OA-like change in the temporomandibular joint (TMJ) induced by an experimentally unilateral anterior crossbite (UAC) and found that the level of microRNA-29b (miR-29b), but not miR-29a or miR-29c, was markedly lower in BMSCs from subchondral bones of UAC mice as compared with that from the sham control mice. With an intra-articular aptamer delivery system, BMSC-specific overexpression of miR-29b by aptamer-agomiR-29b rescued subchondral bone loss and osteoclast hyperfunction in UAC mice, as demonstrated by a significant increase in bone mineral density, bone volume fraction, trabecular thickness, and the gene expression of osteocalcin and Runx2 but decreased trabecular separation, osteoclast number and osteoclast surface/bone surface, and the gene expression of cathepsin K, Trap, Wnt5a, Rankl, and Rank as compared with those in the UAC mice treated by aptamer-NC (all P < 0.05). In addition, BMSC-specific inhibition of miR-29b by aptamer-antagomiR-29b exacerbated those responses in UAC mice. Notably, although it primarily affected miR-29b levels in the subchondral bone (but not in cartilage and synovium), BMSC-specific overexpression of miR-29b in UAC mice largely rescued OA-like cartilage degradation, including decreased chondrocyte density, cartilage thickness, and the percentage areas of proteoglycans and type II collagen, while BMSC-specific inhibition of miR-29b aggravated these characteristics of cartilage degradation in UAC mice. Moreover, we identified Wnt5a, but not Rankl or Sdf-1, as the direct target of miR-29b. The results of the present study indicate that miR-29b is a key regulator of the pro-osteoclastic effects of BMSCs in TMJ-OA subchondral bones and plays important roles in the TMJ-OA progression.
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Affiliation(s)
- J L Sun
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, Xi'an, China.,Department of Stomatology, Sixth Medical Center of PLA General Hospital, Beijing, China
| | - J F Yan
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - S B Yu
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - J Zhao
- Department of Stomatology, Sixth Medical Center of PLA General Hospital, Beijing, China
| | - Q Q Lin
- Department of Stomatology, Sixth Medical Center of PLA General Hospital, Beijing, China
| | - K Jiao
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, School of Stomatology, The Fourth Military Medical University, Xi'an, China
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Yan JF, Zhu GG, Yuan Y, Lin CX, Huang SP, Yuan YF. Carborane bridged ferrocenyl conjugated molecules: synthesis, structure, electrochemistry and photophysical properties. NEW J CHEM 2020. [DOI: 10.1039/d0nj00826e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
mono- and bis-carborane bridged ferrocenyl conjugated molecules 8–11 have been synthesized and systematically analyzed.
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Affiliation(s)
- Jian-Feng Yan
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University)
- Department of Chemistry
- Fuzhou University
- Fuzhou 350108
- People's Republic of China
| | - Gai-Ge Zhu
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University)
- Department of Chemistry
- Fuzhou University
- Fuzhou 350108
- People's Republic of China
| | - Ye Yuan
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University)
- Department of Chemistry
- Fuzhou University
- Fuzhou 350108
- People's Republic of China
| | - Cai-Xia Lin
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University)
- Department of Chemistry
- Fuzhou University
- Fuzhou 350108
- People's Republic of China
| | - Shu-Ping Huang
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University)
- Department of Chemistry
- Fuzhou University
- Fuzhou 350108
- People's Republic of China
| | - Yao-Feng Yuan
- Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University)
- Department of Chemistry
- Fuzhou University
- Fuzhou 350108
- People's Republic of China
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Shen J, Yuan Y, Hu K, Lian X, Hou XR, Sun S, Yan JF, Liu ZK, Zhang FQ. [Survival and prognostic factors analysis of primitive neuroectodermal tumor]. Zhonghua Zhong Liu Za Zhi 2018; 40:614-618. [PMID: 30139033 DOI: 10.3760/cma.j.issn.0253-3766.2018.08.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the clinical features and prognosis of primitive neuroectodermal tumor (PNET). Methods: The clinical data of 99 patients with PNET from February 1, 1998 to February 1, 2017 were retrospectively analyzed. Univariate analysis was performed using Kaplan-Meier and Log rank test. Multiviate Cox regression was applied to analyzed independent prognostic factor for patient survival. Results: Among the 99 patients, 81 were peripheral PNET(pPNET) and 18 were central PNET (cPNET) . Biopsy was performed exclusively in 16 cases, with R0 resection in 61 cases, with R1 resection in 4 cases, and with R2 resection in 18 cases. Twelve patients underwent surgery only, nine had chemotherapy only, and one received radiotherapy only. There were 72 patients who had combined treatment including chemotherapy, and 48 patients had combined therapy including radiotherapy. The one-year, three-year and five-year overall survival(OS) rates of the 99 PNET patients were 79.2%, 63.9% and 56.1% respectively, and median OS time was 14.0 months. The one-year, three-year and five-year progression free survival (PFS) rates of these patients were 42.7%, 25.7% and 19.8% respectively, and median PFS time was 8.0 months. The univariate analysis revealed that lymph node metastasis, surgical resection, numbers of cycles of chemotherapy and radiotherapy dose were the main factors affecting the OS (all P<0.05). Gender, age, lymph node metastasis, staging, and chemotherapy cycles were related to PFS in PNET patients (P<0.05). Multivariate analysis showed that the degree of surgical resection, chemotherapy cycle, and radiotherapy dosage were independent influencing factors of OS in PNET patients (risk ratio=1.856, 0.398, and 0.408, respectively, all P<0.05), and gender was an independent factor influencing PFS in PNET patients (risk ratio=0.494, P<0.05). Conclusions: Comprehensive therapy is the main therapy for PNET patients. The surgical resection, cycles of chemotherapy and radiotherapy dosage are independent prognostic factors for patient's OS.
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Affiliation(s)
- J Shen
- Department of Radiation Oncology, Peking Union Medical College Hospital, Beijing 100730, China
| | - Y Yuan
- Department of Radiation Oncology, Nanshi Hospital of Nanyang, Nanyang 473005, China
| | - K Hu
- Department of Radiation Oncology, Peking Union Medical College Hospital, Beijing 100730, China
| | - X Lian
- Department of Radiation Oncology, Peking Union Medical College Hospital, Beijing 100730, China
| | - X R Hou
- Department of Radiation Oncology, Peking Union Medical College Hospital, Beijing 100730, China
| | - S Sun
- Department of Radiation Oncology, Peking Union Medical College Hospital, Beijing 100730, China
| | - J F Yan
- Department of Radiation Oncology, Peking Union Medical College Hospital, Beijing 100730, China
| | - Z K Liu
- Department of Radiation Oncology, Peking Union Medical College Hospital, Beijing 100730, China
| | - F Q Zhang
- Department of Radiation Oncology, Peking Union Medical College Hospital, Beijing 100730, China
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Yuan Y, Yan JF, Lin DQ, Mao BW, Yuan YF. Ferrocene-Alkynyl Conjugated Molecular Wires: Synthesis, Characterization, and Conductance Properties. Chemistry 2018; 24:3545-3555. [DOI: 10.1002/chem.201705176] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Ye Yuan
- Department of Chemistry; Fuzhou University; Fuzhou 350116 China
| | - Jian-Feng Yan
- Department of Chemistry; Fuzhou University; Fuzhou 350116 China
| | - Da-Qiang Lin
- Department of Chemistry; Fuzhou University; Fuzhou 350116 China
| | - Bing-Wei Mao
- State Key Laboratory of Physical Chemistry of Solid Surfaces; College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 China
| | - Yao-Feng Yuan
- Department of Chemistry; Fuzhou University; Fuzhou 350116 China
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Jin WW, Xu XW, Mou YP, Zhou YC, Zhang RC, Yan JF, Zhou JY, Huang CJ, Lu C. [Laparoscopic pancreaticoduodenectomy: a report of 233 cases by a single team]. Zhonghua Wai Ke Za Zhi 2017; 55:354-358. [PMID: 28464575 DOI: 10.3760/cma.j.issn.0529-5815.2017.05.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To summary the experience of 233 cases of laparoscopic pancreaticoduodenectomy (LPD) performed by a single surgical team. Methods: Data of patients undergoing LPD from September 2012 to October 2016 were reviewed. There were 145 males and 88 females with the mean age of(60.3±13.0)years old, ranging from 19 to 92 years old, and the mean body mass index of (22.8±3.5)kg/m(2,) ranging from 16.3 to 36.8 kg/m(2). There were 195 patients with clinical manifestation and 54 patients who had the history of abdominal surgery. Results: LPD were performed on 233 patients by same surgical team consecutively. The mean operative time was(368.0±57.4)minutes. Mean blood loss was(203.8±138.6)ml. The postoperative morbidity rate was 33.5%, with 6.9% of grade B or C pancreatic fistula and 9.9% of bleeding. The reoperation rate was 5.6%. The mortality during 30 days after operation was 0.9%. Mean postoperative hospital stay was (18.1±11.2)days. Mean tumor size was (3.9±2.4)cm, and the mean number of lymph nodes harvested was 21.3±11.9.One hundred and sixty-three patients were diagnosed as malignant tumor, including pancreatic adenocarcinoma(n=84), cholangiocarcinoma(n=17), ampullary adenocarcinoma(n=55), duodenal adenocarcinoma(n=5), gastric cancer(n=1)and duel cancer (n=1) located in distal stomach and duodenum. Conclusion: The key point to make laparoscopic pancreaticduodenectomy a routine safe procedure is to operate the procedure under skilled hands in selected patients via suitable surgical approaches.
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Affiliation(s)
- W W Jin
- Department of Gastro-entero-pancreatic, Zhejiang Provincial People's Hospital, Hangzhou 310014, China
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Yan JF, Lin DQ, Wang XG, Wu KQ, Xie LL, Yuan YF. Ferrocenylethynyl-Terminated Azobenzenes: Synthesis, Electrochemical, and Photoisomerization Studies. Chem Asian J 2015; 10:614-21. [DOI: 10.1002/asia.201403327] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Indexed: 11/08/2022]
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Wang YG, Zhang L, Ji XH, Yan JF, Liu YT, Lv XX, Feng H. Mapping of quantitative trait loci for the bolting trait in Brassica rapa under vernalizing conditions. Genet Mol Res 2014; 13:3927-39. [PMID: 24938603 DOI: 10.4238/2014.may.23.3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Premature bolting can occur occasionally during spring cultivation of heading Chinese cabbage in East Asia when the plants encounter low temperatures (vernalization), leading to economic loss. Breeding bolting-resistant cultivars is the best choice for solving this problem. We looked for QTLs responsible for varietal differences in the bolting trait in Brassica rapa under environmental conditions that promote vernalization. To achieve this goal, we constructed a linkage map with 107 simple sequence repeats and 54 insertion/deletion markers based on a segregating population of 186 F2 individuals. The resulting map consisted of 10 linkage groups and covered a total length of 947.1 cM, with an average genetic distance of 5.84 cM between adjacent markers. QTL analysis of the bolting trait was performed by two phenotypic evaluations (bolting index and flowering time) based on the scores in an F2 population in the spring of 2010, and scores in F2:3 families in autumn 2010 and spring 2011, respectively. Twenty-six QTLs that controlled bolting were detected, accounting for 2.6 to 31.2% of the phenotypic variance. The detected QTLs with large effects co-localized mainly on linkage groups A02, A06, and A07. These QTLs may provide useful information for marker-assisted selection in a breeding program for late bolting or bolting-resistant cultivars in B. rapa crops.
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Affiliation(s)
- Y G Wang
- Department of Horticulture, Shenyang Agricultural University, Shenyang, China
| | - L Zhang
- Department of Horticulture, Shenyang Agricultural University, Shenyang, China
| | - X H Ji
- Department of Horticulture, Shenyang Agricultural University, Shenyang, China
| | - J F Yan
- College of Life Science, Dalian Nationalities University, Dalian, China
| | - Y T Liu
- Department of Horticulture, Shenyang Agricultural University, Shenyang, China
| | - X X Lv
- Department of Horticulture, Shenyang Agricultural University, Shenyang, China
| | - H Feng
- Department of Horticulture, Shenyang Agricultural University, Shenyang, China
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Wu KQ, Guo J, Yan JF, Xie LL, Xu FB, Bai S, Nockemann P, Yuan YF. Ruthenium(ii) bis(terpyridine) electron transfer complexes with alkynyl–ferrocenyl bridges: synthesis, structures, and electrochemical and spectroscopic studies. Dalton Trans 2012; 41:11000-8. [DOI: 10.1039/c2dt31091k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Wu KQ, Guo J, Yan JF, Xie L, Xu FB, Bai S, Nockemann P, Yuan YF. Alkynyl-Bridged Ruthenium(II) 4′-Diferrocenyl-2,2′:6′,2′′-terpyridine Electron Transfer Complexes: Synthesis, Structures, and Electrochemical and Spectroscopic Studies. Organometallics 2011. [DOI: 10.1021/om200113d] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kai-Qiang Wu
- State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, People's Republic of China
| | - Jian Guo
- State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, People's Republic of China
| | - Jian-Feng Yan
- State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, People's Republic of China
| | - Li−Li Xie
- State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, People's Republic of China
| | - Feng-Bo Xu
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Sha Bai
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Peter Nockemann
- School of Chemistry and Chemical Engineering, Queen’s University of Belfast, The QUILL research centre, Belfast BT9 5AQ, United Kingdom
| | - Yao-Feng Yuan
- State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, People's Republic of China
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China
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Chen XP, Yang W, Fan Y, Luo JS, Hong K, Wang Z, Yan JF, Chen X, Lu JX, Benovic JL, Zhou NM. Structural determinants in the second intracellular loop of the human cannabinoid CB1 receptor mediate selective coupling to G(s) and G(i). Br J Pharmacol 2011; 161:1817-34. [PMID: 20735408 DOI: 10.1111/j.1476-5381.2010.01006.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND AND PURPOSE The cannabinoid CB(1) receptor is primarily thought to be functionally coupled to the G(i) form of G proteins, through which it negatively regulates cAMP accumulation. Here, we investigated the dual coupling properties of CB(1) receptors and characterized the structural determinants that mediate selective coupling to G(s) and G(i). EXPERIMENTAL APPROACH A cAMP-response element reporter gene system was employed to quantitatively analyze cAMP change. CB(1)/CB(2) receptor chimeras and site-directed mutagenesis combined with functional assays and computer modelling were used to determine the structural determinants mediating selective coupling to G(s) and G(i). KEY RESULTS CB(1) receptors could couple to both G(s)-mediated cAMP accumulation and G(i)-induced activation of ERK1/2 and Ca(2+) mobilization, whereas CB(2) receptors selectively coupled to G(i) and inhibited cAMP production. Using CB(1)/CB(2) chimeric receptors, the second intracellular loop (ICL2) of the CB(1) receptor was identified as primarily responsible for mediating G(s) and G(i) coupling specificity. Furthermore, mutation of Leu-222 in ICL2 to either Ala or Pro switched G protein coupling from G(s) to G(i), while to Ile or Val led to balanced coupling of the mutant receptor with G(s) and G(i) . CONCLUSIONS AND IMPLICATIONS The ICL2 of CB(1) receptors and in particular Leu-222, which resides within a highly conserved DRY(X)(5) PL motif, played a critical role in G(s) and G(i) protein coupling and specificity. Our studies provide new insight into the mechanisms governing the coupling of CB(1) receptors to G proteins and cannabinoid-induced tolerance.
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Affiliation(s)
- X P Chen
- Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, China
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Guo LQ, Zhang W, Yan JF, Lin XC, Xie ZH, Chen GN. [Research of Hg2+ sol-gel membrane made of organically modified silicates]. Guang Pu Xue Yu Guang Pu Fen Xi 2006; 26:1281-4. [PMID: 17020040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A photochemical sensor for the determination of Hg2+ consisting of organically modified silicates (ormosils) was developed. Hg(2+)-sensitive fluorescent sol-gel films were prepared by co-condensation of tetramethoxysilane (TMOS) and dimethyldimethoxysilane (DMOS), and the fluorescent indicator 5,10,15, 20-tetra (p-sulfonatophenyl) porphyrin sodium was embedded in sol-gel in the form of ion pairs with cetyltrimethyl ammonium bromide. The optimization condition of preparation and response performance of sol-gel membrane were investigated. The experimental results showed a linear range of Hg2+ concentrations from 1.0 x 10(-5) to 1.0 x 10(-4) mol x L(-1) in a Tris-HCl buffer at pH 8.0 with fast response and good repetition. The indicators in the sol-gel membrane did not leak out and the sensor showed good selectivity over other metal ions.
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Affiliation(s)
- Liang-Qia Guo
- Institute of Food Safety and Environmental Monitoring, Fuzhou University, Fuzhou 350002, China
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Abstract
Konjac glucomannan (KGM) is one of the most versatile soluble biomaterials having wide-ranging applications. The shear storage, G', and loss, G", moduli of this hydrocolloid were recorded as functions of angular frequency varying from 0.1 to 100.0 rad/s and temperature from 5 to 50 degrees C. It was found that both G' and G" mainly increase with angular frequency in the range from 0.1 to 100 rad/s. As the temperature increases from 5 to 95 degrees C, the values of G' and G" decrease. A novel criterion for the thermorheologically simple material, and a procedure to calculate the shift factor from the angular frequency sweep and temperature ramp data were presented. By these methods, the KGM hydrocolloid is found to obey the TTS principle as log G" and log G' are less than 1.529 and 1.436, respectively. The Williams-Landel-Ferry equation can describe the shift factor of the KGM hydrocolloid.
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Affiliation(s)
- X H Yang
- Department of Biotechnology and Chemical Engineering, Wuhan Polytechnic University, Hankou, P R China.
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Abstract
We have modeled protein folding by packing a unified length of regular structural elements (alpha-helices and beta-sheets) into a 'cube'. In a globular protein with m alpha-helices and n beta-strands, this unified length is expressed in units of heptapeptides in alpha-helices, and in units of tripeptides in beta-strands. Calculations using published data show that a 4-helix bundle (m = 4, n = 0) has at least 2 x 2 x 2 helical heptapeptides; the 16-strand beta-barrel of porin (m = 0, n = 16) is at most 4 x 4 x 4 tripeptides in beta-strands. Compact, recurring protein modules with mixed helices and beta-strands are the ones that actually acquire a geometrically quasi-spherical, or cubic, shape.
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Affiliation(s)
- B C Yan
- Yan Research, Federal Way, WA 98063, USA
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Abstract
Natural numbers are characterized as being odd or even, prime or non-prime. If the quaternary information units of (DNA or RNA) nucleotide bases are assigned as 0 (for A), 1 (C), 2 (U or T) and 3 (G), then a unique set of amino acid numbers can be obtained by comparing the properties of numbers and coding properties. These numbers are: 0 for "stop" signals, 1 for Trp, 2 for Ile and 3 for Met. For other codons, synonymous quartets follow exclusively the P1 number series (prime numbers of the form 4n + 1); doublets mostly follow the P3 series (primes with quaternary remainder 3). A "one-to-one correspondence" between these numbers and the genetic code is established by considering their combinatorial specificities.
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Affiliation(s)
- J F Yan
- Yan Research, Federal Way, WA 98063-4115
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Abstract
A treelike model has been proposed for the structure of lignin. Kinetics of delignification are formulated to account for the cleavage of linkages along the linear primary chains and at the cross-links. Experimental data obtained from isothermal delignification are used to verify this theory. Good agreement has been obtained in calculating the delignification curves. Activation energies are found to be 172 kilojoules per mole of cross-links and 132 kilojoules per mole of aryl ether bonds.
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Momany FA, McGuire RF, Yan JF, Scheraga HA. Energy parameters in polypeptides. IV. Semiempirical molecular orbital calculations of conformational dependence of energy and partial charge in di- and tripeptides. J Phys Chem 1971; 75:2286-97. [PMID: 5091273 DOI: 10.1021/j100684a011] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Momany FA, McGuire RF, Yan JF, Scheraga HA. Energy parameters in polypeptides. 3. Semiempirical molecular orbital calculations for hydrogen-bonded model peptides. J Phys Chem 1970; 74:2424-38. [PMID: 5448603 DOI: 10.1021/j100706a003] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Vournakis JN, Yan JF, Scheraga HA. Effect of side chains on the conformational energy and rotational strength of the n-pi transition for some alpha-helical poly-alpha-amino acids. Biopolymers 1968; 6:1531-50. [PMID: 5698900 DOI: 10.1002/bip.1968.360061103] [Citation(s) in RCA: 44] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Yan JF, Vanderkooi G, Scheraga HA. Conformational analysis of macromolecules. V. Helical structures of poly-L-aspartic acid and poly-L-glutamic acid, and related compounds. J Chem Phys 1968; 49:2713-26. [PMID: 5682471 DOI: 10.1063/1.1670476] [Citation(s) in RCA: 124] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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Taylor JE, Yan JF, Wang JL. The iron(3)-catalyzed oxidation of cysteine by molecular oxygen in the aqueous phase. An example of a two-thirds-order reaction. J Am Chem Soc 1966; 88:1663-7. [PMID: 5942981 DOI: 10.1021/ja00960a016] [Citation(s) in RCA: 52] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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