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Mu C, Xing D, Zhang D, Gong C, Wang J, Zhao L, Li D, Zhang X. Mass Spectrometry and Cryogenic Electron Microscopy Illuminate Molecular-Level Mechanisms of the Oxidative and Structural Damage to Lipid Membranes by Radical-Bearing Graphene Oxide. J Phys Chem Lett 2022; 13:2638-2643. [PMID: 35298160 DOI: 10.1021/acs.jpclett.2c00211] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 06/14/2023]
Abstract
Biomedical applications of graphene in tumor and bacterial treatment have become cutting-edge fields due to its unique physical and chemical properties. However, a mechanistic understanding of the interactions and reactions between graphene-based material and biological systems such as lipid membranes remains elusive, especially at the molecular level. By using the unique field-induced droplet ionization mass spectrometry and cryogenic electron microscopy methodologies, we reveal the oxidation products of monolayer lipid membranes at the air-water interface and the change in the morphology of bilayer lipid membranes in an aqueous solution caused by the incorporation of graphene oxide bearing π-conjugated carbon radicals [hydrated graphene oxide (hGO)]. We discovered that hGO is an efficient source of hydroxyl radicals and that it is not only the incorporation of the hGO sheets but also the irregular packing of the lipid oxides from the hydroxyl radical oxidation that causes the structural distortions of the liposomes.
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Affiliation(s)
- Chaonan Mu
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), Haihe Laboratory of Sustainable Chemical Transformations, Beijing National Laboratory for Molecular Sciences, Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Dong Xing
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), Haihe Laboratory of Sustainable Chemical Transformations, Beijing National Laboratory for Molecular Sciences, Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Dongmei Zhang
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), Haihe Laboratory of Sustainable Chemical Transformations, Beijing National Laboratory for Molecular Sciences, Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Chu Gong
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), Haihe Laboratory of Sustainable Chemical Transformations, Beijing National Laboratory for Molecular Sciences, Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Jie Wang
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), Haihe Laboratory of Sustainable Chemical Transformations, Beijing National Laboratory for Molecular Sciences, Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Lingling Zhao
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), Haihe Laboratory of Sustainable Chemical Transformations, Beijing National Laboratory for Molecular Sciences, Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Danyang Li
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), Haihe Laboratory of Sustainable Chemical Transformations, Beijing National Laboratory for Molecular Sciences, Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Xinxing Zhang
- College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), Haihe Laboratory of Sustainable Chemical Transformations, Beijing National Laboratory for Molecular Sciences, Shenzhen Research Institute, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
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Zhang J, Gao X, Zheng X, Yang Y, Fan G, Shi Y, Wang J, Mu C. A high stem to leaf ratio reduced rainfall use efficiency under altered rainfall patterns in a semi-arid grassland in northeast China. Plant Biol (Stuttg) 2021; 23:760-769. [PMID: 33915008 DOI: 10.1111/plb.13278] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/21/2021] [Indexed: 06/12/2023]
Abstract
Rainfall use efficiency (RUE) is crucial for understanding the changes in grassland productivity due to variations in future rainfall patterns. Recently, numerous studies have been conducted on the relationship between RUE and the amount of rainfall, but there has been little research on the influence of rainfall distribution and the interactive effect of rainfall amounts and distribution on RUE. Here, a simulated rainfall experiment was conducted to evaluate the impacts of rainfall amount (average rainfall amount (R0), 334 mm; decreased (R-) and increased (R+) rainfall amounts, 233 mm and 434 mm, respectively) and dry intervals (comprising 6-day, 9-day, 12-day, 15-day, 18-day and 21-day intervals between rainfall) on productivity and RUE in Leymus chinensis (Trin.) Tzvel., a dominant grass of the Eastern Eurasian Steppe. Our results showed that (1) for biomass production and RUE, moderate extension of dry intervals was conducive to enhancing total biomass production and RUE. The peak values of total biomass and RUE appeared during the 15-day interval for R-, and the 18-day interval for R0 and R+. (2) For biomass allocation, extension of dry intervals decreased the stem to leaf ratio (S/L) and the root to shoot ratio (R/S). (3) Further, the S/L ratio was significantly negatively correlated with RUE. These results suggest that variations in rainfall patterns can alter the RUE by changing the S/L ratio, and finally influence biomass production in L. chinensis. These findings have important implications for understanding and predicting the effect of future climate change on productivity in semi-arid grassland.
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Affiliation(s)
- J Zhang
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, 130024, China
| | - X Gao
- Meteorological Observatory of Jilin Province, Changchun Jilin Province, 130062, China
| | - X Zheng
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, 130024, China
| | - Y Yang
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, 130024, China
| | - G Fan
- Key Laboratory of Photobiology, Institute of botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Y Shi
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, 130024, China
| | - J Wang
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, 130024, China
| | - C Mu
- Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Jilin Songnen Grassland Ecosystem National Observation and Research Station, Northeast Normal University, Changchun, 130024, China
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Gong C, Zhao Y, Zhang D, Wang J, Mu C, Wang W, Zhu S, Zhang X. Investigation of the Acid-Mediated Photosensitized Reactions of Amphiphilic α-Keto Acids at the Air-Water Interface Using Field-Induced Droplet Ionization Mass Spectrometry. J Am Soc Mass Spectrom 2021; 32:2306-2312. [PMID: 33561341 DOI: 10.1021/jasms.1c00022] [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] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The photochemistry of α-keto acids has been of great interest due to its implications in atmospheric and prebiotic chemistries. α-Keto acids with long alkyl chains are amphiphilic in nature, and they tend to partition at the air-water interface of atmospheric water droplets and add to the complexity of the chemistries therein. The air-water interface is a unique environment that plays a vital role in overall atmospheric processes. However, existing studies mostly focus on the photochemistry of α-keto acids in the bulk solution and neglect the reactions that occur at the interface. In this study, using the field-induced droplet ionization mass spectrometry methodology that is capable of selectively sampling amphiphilic molecules that reside at the air-water interface, we show that the acid-mediated photochemistry of 2-oxooctanoic acid and 2-oxoheptoic acid is highly different from those of previously reported reactions in the bulk and contributes to the formation of humic-like substances (HULIS). This work emphasizes the uniqueness of the photochemistry at the air-water interface. We anticipate that studies of atmosphere-relevant photochemistry at the air-water interface will be an avenue rich with opportunities.
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Affiliation(s)
- Chu Gong
- College of Chemistry, Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory and Institute of Elemento-Organic Chemistry, Renewable Energy Conversion and Storage Center (ReCAST), Nankai University, Tianjin 300071, China
| | - Yutao Zhao
- College of Chemistry, Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory and Institute of Elemento-Organic Chemistry, Renewable Energy Conversion and Storage Center (ReCAST), Nankai University, Tianjin 300071, China
| | - Dongmei Zhang
- College of Chemistry, Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory and Institute of Elemento-Organic Chemistry, Renewable Energy Conversion and Storage Center (ReCAST), Nankai University, Tianjin 300071, China
| | - Jie Wang
- College of Chemistry, Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory and Institute of Elemento-Organic Chemistry, Renewable Energy Conversion and Storage Center (ReCAST), Nankai University, Tianjin 300071, China
| | - Chaonan Mu
- College of Chemistry, Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory and Institute of Elemento-Organic Chemistry, Renewable Energy Conversion and Storage Center (ReCAST), Nankai University, Tianjin 300071, China
| | - Wei Wang
- College of Chemistry, Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory and Institute of Elemento-Organic Chemistry, Renewable Energy Conversion and Storage Center (ReCAST), Nankai University, Tianjin 300071, China
| | - Shoufei Zhu
- College of Chemistry, Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory and Institute of Elemento-Organic Chemistry, Renewable Energy Conversion and Storage Center (ReCAST), Nankai University, Tianjin 300071, China
| | - Xinxing Zhang
- College of Chemistry, Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory and Institute of Elemento-Organic Chemistry, Renewable Energy Conversion and Storage Center (ReCAST), Nankai University, Tianjin 300071, China
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Zhang D, Gong C, Wang J, Mu C, Wang W, Zhang X. Beyond lipid peroxidation: Distinct mechanisms observed for POPC and POPG oxidation initiated by UV-enhanced Fenton reactions at the air-water interface. J Mass Spectrom 2021; 56:e4626. [PMID: 32776645 DOI: 10.1002/jms.4626] [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] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 07/01/2020] [Accepted: 07/13/2020] [Indexed: 06/11/2023]
Abstract
Fenton or Fenton-like reactions are ubiquitous in nature, and the hydroxyl radicals (·OH) generated in these reactions are accountable for a plethora of oxidation processes both in the environment and in vivo. Among these oxidation reactions, lipid oxidation initiated by ·OH radicals has long been oversimplified as a peroxidation mechanism, but in reality, it is a highly complicated process that can result in a large variety of products. Using the unique field-induced droplet ionization mass spectrometry (FIDI-MS) methodology that is capable of selective sampling of amphiphilic molecules that reside at the air-water interface, here, we show distinct mechanisms from the ultraviolet (UV)-enhanced Fenton oxidations of two phospholipids, POPC and POPG, even though these two lipids possess the same functional groups that are vulnerable to ·OH attack. We postulate that it is the different packing densities that determine the permeability of ambient NO molecules into the monolayers, resulting in highly distinct reaction pathways and products. We anticipate that this work will be a wake-up call that the lipid peroxidation mechanism is sometimes taken for granted and that lipid oxidation can be subtly affected by various factors that deserves deeper investigations.
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Affiliation(s)
- Dongmei Zhang
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, 94 Weijin Road, Tianjin, 300071, China
| | - Chu Gong
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, 94 Weijin Road, Tianjin, 300071, China
| | - Jie Wang
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, 94 Weijin Road, Tianjin, 300071, China
| | - Chaonan Mu
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, 94 Weijin Road, Tianjin, 300071, China
| | - Wei Wang
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, 94 Weijin Road, Tianjin, 300071, China
| | - Xinxing Zhang
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, 94 Weijin Road, Tianjin, 300071, China
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Mu C, Wang W, Wang J, Gong C, Zhang D, Zhang X. Probe‐Free Direct Identification of Type I and Type II Photosensitized Oxidation Using Field‐Induced Droplet Ionization Mass Spectrometry. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010294] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Chaonan Mu
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Wei Wang
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Jie Wang
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Chu Gong
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Dongmei Zhang
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Xinxing Zhang
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
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Wang W, Wang J, Gong C, Mu C, Zhang D, Zhang X. Designer Mg−Mg and Zn−Zn single bonds facilitated by double aromaticity in the M2B7− (M=Mg, Zn) clusters. CHINESE J CHEM PHYS 2020. [DOI: 10.1063/1674-0068/cjcp2004057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Wei Wang
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jie Wang
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, Tianjin 300071, China
| | - Chu Gong
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, Tianjin 300071, China
| | - Chaonan Mu
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, Tianjin 300071, China
| | - Dongmei Zhang
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xinxing Zhang
- Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (ReCAST), College of Chemistry, Nankai University, Tianjin 300071, China
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Mu C, Wang W, Wang J, Gong C, Zhang D, Zhang X. Probe‐Free Direct Identification of Type I and Type II Photosensitized Oxidation Using Field‐Induced Droplet Ionization Mass Spectrometry. Angew Chem Int Ed Engl 2020; 59:21515-21519. [DOI: 10.1002/anie.202010294] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Chaonan Mu
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Wei Wang
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Jie Wang
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Chu Gong
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Dongmei Zhang
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
| | - Xinxing Zhang
- College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) Nankai University Tianjin 300071 China
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Gao Y, Lu B, Xu B, Jiang T, Hu H, Chen W, Zhang F, Song L, Mu C, Xu L, Zhao N, An Y. Diagnostic Performance Of Optimal Fusion Model Algorithm Based Computed Tomography Derived Fractional Flow Reserve For Hemodynamic Ischemia Assessment. J Cardiovasc Comput Tomogr 2020. [DOI: 10.1016/j.jcct.2020.06.086] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Fedik N, Mu C, Popov IA, Wang W, Wang J, Wang H, Bowen KH, Boldyrev AI, Zhang X. Boron‐Made N
2
: Realization of a B≡B Triple Bond in the B
2
Al
3
−
Cluster. Chemistry 2020; 26:8017-8021. [DOI: 10.1002/chem.202001159] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 04/05/2020] [Indexed: 01/23/2023]
Affiliation(s)
- Nikita Fedik
- Department of Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT 84322-0300 USA
| | - Chaonan Mu
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of, Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Ivan A. Popov
- Theoretical Division Los Alamos National Laboratory Los Alamos New Mexico 87545 USA
| | - Wei Wang
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of, Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Jie Wang
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of, Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 P. R. China
| | - Haopeng Wang
- Departments of Chemistry and Material Science Johns Hopkins University Baltimore MD 21218 USA
| | - Kit H. Bowen
- Departments of Chemistry and Material Science Johns Hopkins University Baltimore MD 21218 USA
| | - Alexander I. Boldyrev
- Department of Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT 84322-0300 USA
| | - Xinxing Zhang
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of, Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 P. R. China
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Mu C, Lee S. 0200 Trait Mindfulness Moderates the Within-Person Relationship Between Sleep and Pain in Nurses. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.198] [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: 11/13/2022] Open
Abstract
Abstract
Introduction
Sleep and pain have a bidirectional relationship in clinical populations; however, we know less about the daily association in non-clinical but potentially vulnerable populations. Nurses are prone to poor sleep and pain symptoms due to work schedules and occupational stress. Implications from mindfulness-based interventions suggest that mindfulness may play a role in improving sleep and subsequently, reducing pain. The current study examined the within-person relationship between sleep and pain in nurses, and whether trait mindfulness moderates the relationship.
Methods
Participants were 60 nurses employed at a cancer hospital (Mage=35.35±11.83, 32% reported pain). For 14 consecutive days, ecological momentary assessment collected participants’ sleep characteristics, pain symptoms (i.e., chest pain, headaches, upset stomach, and other pain), and pain interference with daily activities. Trait mindfulness was measured using the 15-item Mindful Attention Awareness Scale. Multilevel modeling decomposed variances at the between- and within-person levels.
Results
At the between-person level, after controlling for sociodemographic covariates, more frequent insomnia symptoms (β=0.35) or lower sleep sufficiency (β=-0.19) were associated with more pain symptoms (ps<.05). Inversely, individuals with more pain symptoms reported lower sleep sufficiency (β=-0.41, p<.05). At the within-person level, after nights with poorer sleep quality (β=-0.08, p<.01), lower sleep sufficiency (β=-0.08, p<.01), or shorter sleep duration (β =-0.03, p<.05), participants reported more pain symptoms the following day. There were significant interactions of mindfulness with (a) sleep sufficiency predicting pain interference and (b) sleep duration predicting number of pain symptoms, such that the adverse associations of less sufficient and shorter sleep with more pain were more apparent in those with lower mindfulness than those with higher mindfulness.
Conclusion
Although there was a bidirectional association between sleep and pain at the between-person level, sleep was more likely to be the predictor of pain at the within-person level in oncology nurses. The significant moderation by mindfulness suggest that promoting mindfulness among nurses, prone to having poor sleep and pain, may reduce the adverse impact of poor sleep on daily pain.
Support
This work was supported, in part, by the University of South Florida College of Behavioral & Community Sciences Internal Grant Program (PI: Lee, Grant No. 0134930).
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Affiliation(s)
- C Mu
- University of South Florida, School of Aging Studies, Tampa, FL
| | - S Lee
- University of South Florida, School of Aging Studies, Tampa, FL
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Lee S, Mu C, Gonzalez BD, Vinci CE, Small BJ. 0149 Nightly Sleep Characteristics are Associated with Next-Day Mindfulness. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.147] [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: 11/13/2022] Open
Abstract
Abstract
Introduction
Previous research shows that insufficient and poor sleep is associated with perceiving more stressors the following day. Sleep may also be associated with daily mindfulness, a state in which one is highly aware and focused on the present moment without evaluating or judging that moment. The association between high mindfulness and better sleep is well-established; yet, less is known about the temporal directionality between sleep and mindfulness. This study examined whether nightly sleep predicts next-day mindfulness, and vice versa.
Methods
Participants were 60 middle-aged adults working as a full-time nurse at a cancer hospital (Mage=35.35±11.83). Using ecological momentary assessments for 14 days, we asked participants about their previous night’s sleep upon waking and participants completed the 5-item state Mindful Attention Awareness Scale an average of 3 times/day. Multilevel modeling examined variance at the between- and within-person levels and tested two temporal directions simultaneously: better sleep predicting mindfulness and mindfulness predicting better sleep.
Results
Daily mindfulness, sleep duration, sleep sufficiency, and sleep quality displayed 34%, 85%, 82%, and 85% within-person variation, respectively. At the within-person level, daily mindfulness was greater on days following longer than usual sleep duration (B=0.39hrs or 23min, p<.01) and greater than usual sleep sufficiency (B=0.26, p<.001). The within-person link between sleep sufficiency and mindfulness remained even after controlling for the strong association of workdays with less sleep sufficiency. Conversely, mindfulness was not predictive of sleep outcomes. At the between-person level, participants who had greater sleep sufficiency and higher sleep quality overall reported greater mindfulness. These associations remained after adjusting for sociodemographics, dayshift vs. nightshift, and workdays vs. non-work days.
Conclusion
Sufficient sleep duration and perceived sleep sufficiency may be antecedents of how mindful individuals are the following day. Future analyses will test whether the daily link between sleep and mindfulness contributes to health outcomes.
Support
This work was supported, in part, by the University of South Florida College of Behavioral & Community Sciences Internal Grant Program (PI: Lee, Grant No. 0134930).
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Affiliation(s)
- S Lee
- University of South Florida, Tampa, FL
| | - C Mu
- University of South Florida, Tampa, FL
| | | | | | - B J Small
- University of South Florida, Tampa, FL
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Mu C, Lee S, Risal PG, Vigoureux TF, Bugos J, Meng H. 0341 Preliminary Effects of a Music Intervention on Actigraphy-Measured Sleep Among Older Adults with Dementia. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.338] [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: 11/12/2022] Open
Abstract
Abstract
Introduction
Music may benefit sleep and daytime alertness by decreasing stress, increasing attention, and potentially, slowing the progression of dementia. This study examined preliminary effects of a group-based music intervention on sleep health among older adults with dementia.
Methods
Participants were older adults with dementia living in an assisted living facility (n=9; Mage=80.11; Mrange=63−89 years). Cohort 1 (n=4) received the intervention in the morning and cohort 2 (n=5) received the intervention in the afternoon. Participants completed a 4-week intervention protocol (12 sessions) along with a one-week actigraphy sleep assessment before and after the intervention. Informed by sleep literature, we constructed a composite sleep health score encompassing Regularity, Satisfaction or quality, Alertness, Timing, Efficiency, and Duration (higher scores indicating more daily sleep problems). Using descriptive statistics and multilevel modeling, we evaluated preliminary effects of the intervention on overall sleep health and each of the sleep dimensions.
Results
Six out of nine participants exhibited a decrease in overall sleep problems at post-intervention. All 4 participants in cohort 1 showed improvement in overall sleep health at post-intervention. Specifically, in cohort 1, participants exhibited a decline in nightly sleep problems, decreased daytime nap duration, and number of naps. In contrast, while two out of five participants in cohort 2 exhibited improvement in overall sleep health, the remainder of the participants exhibited no improvement in daily sleep problems, especially in nap domains. Across cohorts, those younger in age, with vascular dementia, lower weight, and not taking sleep or hypertension related medications tended to respond better to the intervention.
Conclusion
Our preliminary results demonstrate the feasibility and potential benefit of a group-based music intervention in improving overall sleep health among older patients with dementia. Implications for conducting community-based non-pharmacological interventions to improve sleep and daytime functioning among older adults with dementia will be discussed.
Support
This work was supported, in part, by the Florida Department of Health Ed and Ethel Moore Alzheimer’s Disease Research Award (PI: Meng, Grant #9AZ28).
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Affiliation(s)
- C Mu
- University of South Florida, School of Aging Studies, Tampa, FL
| | - S Lee
- University of South Florida, School of Aging Studies, Tampa, FL
| | - P G Risal
- University of South Florida, School of Aging Studies, Tampa, FL
| | - T F Vigoureux
- University of South Florida, School of Aging Studies, Tampa, FL
| | - J Bugos
- University of South Florida, School of Aging Studies, Tampa, FL
| | - H Meng
- University of South Florida, School of Aging Studies, Tampa, FL
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Jiang J, Mu C, Zhao J, Zeng D, Wang C, Li H, Ye J, Zhang T. P1.11-07 CfDNA from Bronchoalveolar Lavage Fluid for the Identification of Solid Pulmonary Nodules: A New Medium of Liquid Biopsy. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1080] [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: 11/26/2022]
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14
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Mu C, Wang J, Barraza KM, Zhang X, Beauchamp JL. Mass Spectrometric Study of Acoustically Levitated Droplets Illuminates Molecular‐Level Mechanism of Photodynamic Therapy for Cancer involving Lipid Oxidation. Angew Chem Int Ed Engl 2019; 58:8082-8086. [DOI: 10.1002/anie.201902815] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Chaonan Mu
- Key Laboratory of Advanced Energy Materials Chemistry, (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 China
| | - Jie Wang
- Key Laboratory of Advanced Energy Materials Chemistry, (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 China
| | - Kevin M. Barraza
- Noyes Laboratory of Chemical Physics and the Beckman Institute California Institute of Technology Pasadena CA 91125 USA
| | - Xinxing Zhang
- Key Laboratory of Advanced Energy Materials Chemistry, (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 China
| | - J. L. Beauchamp
- Noyes Laboratory of Chemical Physics and the Beckman Institute California Institute of Technology Pasadena CA 91125 USA
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15
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Mu C, Wang J, Barraza KM, Zhang X, Beauchamp JL. Mass Spectrometric Study of Acoustically Levitated Droplets Illuminates Molecular‐Level Mechanism of Photodynamic Therapy for Cancer involving Lipid Oxidation. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201902815] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Chaonan Mu
- Key Laboratory of Advanced Energy Materials Chemistry, (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 China
| | - Jie Wang
- Key Laboratory of Advanced Energy Materials Chemistry, (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 China
| | - Kevin M. Barraza
- Noyes Laboratory of Chemical Physics and the Beckman Institute California Institute of Technology Pasadena CA 91125 USA
| | - Xinxing Zhang
- Key Laboratory of Advanced Energy Materials Chemistry, (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCAST) College of Chemistry Nankai University Tianjin 300071 China
| | - J. L. Beauchamp
- Noyes Laboratory of Chemical Physics and the Beckman Institute California Institute of Technology Pasadena CA 91125 USA
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16
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Wang W, Marshall M, Collins E, Marquez S, Mu C, Bowen KH, Zhang X. Intramolecular electron-induced proton transfer and its correlation with excited-state intramolecular proton transfer. Nat Commun 2019; 10:1170. [PMID: 30862822 PMCID: PMC6414547 DOI: 10.1038/s41467-019-09154-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [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: 11/08/2018] [Accepted: 02/20/2019] [Indexed: 11/09/2022] Open
Abstract
Electron-induced proton transfer depicts the proton motion coupled with the attachment of a low-energy electron to a molecule, which helps to understand copious fundamental chemical processes. Intramolecular electron-induced proton transfer is a similar process that occurs within a single molecule. To date, there is only one known intramolecular example, to the best of our knowledge. By studying the 10-hydroxybenzo[h]quinoline and 8-hydroxyquinoline molecules using anion photoelectron spectroscopy and density functional theory, and by theoretical screening of six other molecules, here we show the intramolecular electron-induced proton transfer capability of a long list of molecules that meanwhile have the excited-state intramolecular proton transfer property. Careful examination of the intrinsic electronic signatures of these molecules reveals that these two distinct processes should occur to the same category of molecules. Intramolecular electron-induced proton transfer could have potential applications such as molecular devices that are responsive to electrons or current.
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Affiliation(s)
- Wei Wang
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, 300071, Tianjin, China
| | - Mary Marshall
- Department of Chemistry, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Evan Collins
- Department of Chemistry, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Sara Marquez
- Department of Chemistry, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Chaonan Mu
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, 300071, Tianjin, China
| | - Kit H Bowen
- Department of Chemistry, Johns Hopkins University, Baltimore, MD, 21218, USA.
| | - Xinxing Zhang
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, 300071, Tianjin, China.
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17
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Zhang X, Popov IA, Lundell KA, Wang H, Mu C, Wang W, Schnöckel H, Boldyrev AI, Bowen KH. Realization of an Al≡Al Triple Bond in the Gas‐Phase Na
3
Al
2
−
Cluster via Double Electronic Transmutation. Angew Chem Int Ed Engl 2018; 57:14060-14064. [DOI: 10.1002/anie.201806917] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Xinxing Zhang
- Collaborative Innovation Center of Chemical Science and Engineering College of Chemistry Nankai University Tianjin 300071 China
| | - Ivan A. Popov
- Theoretical Division Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Katie A. Lundell
- Department of Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT 84322-0300 USA
| | - Haopeng Wang
- Departments of Chemistry and Material Science Johns Hopkins University Baltimore MD 21218 USA
| | - Chaonan Mu
- Collaborative Innovation Center of Chemical Science and Engineering College of Chemistry Nankai University Tianjin 300071 China
| | - Wei Wang
- Collaborative Innovation Center of Chemical Science and Engineering College of Chemistry Nankai University Tianjin 300071 China
| | - Hansgeorg Schnöckel
- Institute of Inorganic Chemistry Karlsruhe Institute of Technology Engesserstr. 15 76131 Karlsruhe Germany
| | - Alexander I. Boldyrev
- Department of Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT 84322-0300 USA
| | - Kit H. Bowen
- Departments of Chemistry and Material Science Johns Hopkins University Baltimore MD 21218 USA
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18
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Zhang X, Popov IA, Lundell KA, Wang H, Mu C, Wang W, Schnöckel H, Boldyrev AI, Bowen KH. Realization of an Al≡Al Triple Bond in the Gas‐Phase Na
3
Al
2
−
Cluster via Double Electronic Transmutation. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806917] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Xinxing Zhang
- Collaborative Innovation Center of Chemical Science and Engineering College of Chemistry Nankai University Tianjin 300071 China
| | - Ivan A. Popov
- Theoretical Division Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Katie A. Lundell
- Department of Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT 84322-0300 USA
| | - Haopeng Wang
- Departments of Chemistry and Material Science Johns Hopkins University Baltimore MD 21218 USA
| | - Chaonan Mu
- Collaborative Innovation Center of Chemical Science and Engineering College of Chemistry Nankai University Tianjin 300071 China
| | - Wei Wang
- Collaborative Innovation Center of Chemical Science and Engineering College of Chemistry Nankai University Tianjin 300071 China
| | - Hansgeorg Schnöckel
- Institute of Inorganic Chemistry Karlsruhe Institute of Technology Engesserstr. 15 76131 Karlsruhe Germany
| | - Alexander I. Boldyrev
- Department of Chemistry and Biochemistry Utah State University 0300 Old Main Hill Logan UT 84322-0300 USA
| | - Kit H. Bowen
- Departments of Chemistry and Material Science Johns Hopkins University Baltimore MD 21218 USA
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19
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Pei Y, Mu C, Li H, Li F, Chen J. Low-Cost K 4 Fe(CN) 6 as a High-Voltage Cathode for Potassium-Ion Batteries. ChemSusChem 2018; 11:1285-1289. [PMID: 29498226 DOI: 10.1002/cssc.201800057] [Citation(s) in RCA: 12] [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] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 02/28/2018] [Indexed: 06/08/2023]
Abstract
Potassium-ion batteries (KIBs) are of interest for large-scale electrical energy storage, owing to the abundance of K resources and potential high energy density. Low-cost cathodes with high performance are crucial for KIBs. Herein, K4 Fe(CN)6 is shown to be a low-cost and high-voltage cathode for KIBs. It can deliver a high voltage of approximately 3.6 V and a discharge capacity of 65.5 mAh g-1 with a lifespan of 400 cycles of discharge and charge. This is attributed to the strong σ bonds between C atoms and Fe and to the reduced particle size and good contact with conductive carbon brought about by ball milling, which benefit both the K+ ion and the electronic conduction. The [Fe(CN)6 ]3-/4- redox couple is found to be responsible for charge compensation upon reversible extraction/insertion of K+ from/into K4 Fe(CN)6 . The high voltage and stability of K4 Fe(CN)6 will make it a promising low-cost cathode for KIBs and encourage more investigations into high-performance cathode materials.
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Affiliation(s)
- Yuhou Pei
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Chaonan Mu
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Haixia Li
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Fujun Li
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Jun Chen
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300071, P. R. China
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20
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Lei K, Wang C, Liu L, Luo Y, Mu C, Li F, Chen J. A Porous Network of Bismuth Used as the Anode Material for High-Energy-Density Potassium-Ion Batteries. Angew Chem Int Ed Engl 2018; 57:4687-4691. [DOI: 10.1002/anie.201801389] [Citation(s) in RCA: 335] [Impact Index Per Article: 55.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Kaixiang Lei
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Chenchen Wang
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Luojia Liu
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Yuwen Luo
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Chaonan Mu
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Fujun Li
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Jun Chen
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
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21
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Lei K, Wang C, Liu L, Luo Y, Mu C, Li F, Chen J. A Porous Network of Bismuth Used as the Anode Material for High-Energy-Density Potassium-Ion Batteries. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201801389] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kaixiang Lei
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Chenchen Wang
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Luojia Liu
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Yuwen Luo
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Chaonan Mu
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Fujun Li
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
| | - Jun Chen
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education); College of Chemistry; Nankai University; Tianjin 300071 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300071 China
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22
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Abstract
A dual-function battery composed of a NaTi2(PO4)3 anode and a Ag cathode with NaCl aqueous electrolyte has been reported for simultaneous seawater desalination and renewable energy storage.
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Affiliation(s)
- Liubin Wang
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- College of Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
| | - Chaonan Mu
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- College of Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
| | - Haixia Li
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- College of Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
| | - Fujun Li
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)
- College of Chemistry
- Nankai University
- Tianjin 300071
- P. R. China
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23
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Zhao J, Wang Y, Mu C, Xu Y, Sang J. MAGEA1 interacts with FBXW7 and regulates ubiquitin ligase-mediated turnover of NICD1 in breast and ovarian cancer cells. Oncogene 2017; 36:5023-5034. [DOI: 10.1038/onc.2017.131] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 03/22/2017] [Accepted: 03/27/2017] [Indexed: 12/17/2022]
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24
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Huang Z, Mu C, Chen Y, Zhu Z, Chen C, Lan L, Xu Q, Zhao W, Chen G. Effects of dietary probiotic supplementation on LXRα and CYP7α1 gene expression, liver enzyme activities and fat metabolism in ducks. Br Poult Sci 2015; 56:218-24. [PMID: 25559164 DOI: 10.1080/00071668.2014.1000821] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
1. The objective of this study was to investigate the effects of dietary probiotic supplementation on liver X receptor alpha (LXRα) and cholesterol 7α-hydroxylase (CYP7α1) mRNA levels, protein enzymatic activities and fat metabolism in Cherry Valley Pekin ducks. 2. A total of 750 one-day-old Cherry Valley Pekin ducks were randomly divided into 5 groups with three replicates of 50 ducks each in a completely randomised experiment. Each group was fed on a basal diet supplemented with 0, 500, 1000, 1500 or 2000 mg probiotics/kg. 3. Body rate and feed conversion ratio were highest and abdominal subcutaneous fat % was lowest at 1000 mg probiotic/kg. 4. The mRNA levels of LXRα and CYP7α1 in liver tissue was estimated by RT-PCR; serum triglyceride (TG) and total cholesterol (TC) concentrations were measured by ELISA. 5. The expression levels and enzyme activity of LXRα and CYP7α1 increased in conjunction with decreases in TG and TC concentrations following probiotic supplementation to a maximum at 1000 mg probiotics/kg and decreased thereafter. 6. It is concluded that dietary probiotics can enhance LXRα and CYP7α1 enzyme activities in the liver and reduce lipid concentrations and fat deposition in ducks.
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Affiliation(s)
- Z Huang
- a Jiangsu Key Laboratory for Animal Genetic, Breeding and Molecular Design , Yangzhou University , Yangzhou 225009 , Jiangsu , China
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25
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Abstract
Bio-inspired laminated graphite nanosheets/copper composites with modified mechanical properties.
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Affiliation(s)
- P. Wang
- Shanghai Hiwave Advanced Materials Technology Co., Ltd
- Shanghai 200240
- P. R. China
| | - W. Liu
- Shanghai Hiwave Advanced Materials Technology Co., Ltd
- Shanghai 200240
- P. R. China
| | - L. Chen
- Shanghai Hiwave Advanced Materials Technology Co., Ltd
- Shanghai 200240
- P. R. China
| | - C. Mu
- Wenzhou Hongfeng Electrical Alloy Co., Ltd
- Wenzhou 325603
- P. R. China
| | - G. Qi
- Wenzhou Hongfeng Electrical Alloy Co., Ltd
- Wenzhou 325603
- P. R. China
| | - F. Bian
- Shanghai Synchrotron Radiation Facility
- Shanghai Institute of Applied Physics Chinese Academy of Sciences
- Shanghai 201204
- P. R. China
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26
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Yao C, Hu, Mu C. Mass production of function neutrophils from human hematopoietic stem cells by serum-free culture strategy. Cytotherapy 2014. [DOI: 10.1016/j.jcyt.2014.01.196] [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: 11/28/2022]
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27
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Feng Y, Bian W, Mu C, Xu Y, Wang F, Qiao W, Huang Y. Establish and verify TSH reference intervals using optimized statistical method by analyzing laboratory-stored data. J Endocrinol Invest 2014; 37:277-84. [PMID: 24615364 DOI: 10.1007/s40618-013-0031-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [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] [Received: 07/30/2013] [Accepted: 11/16/2013] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To establish reference intervals using an optimized statistical method by collecting available laboratory data of thyroid stimulating hormone (TSH), and then to verify with the laboratory-present reference intervals. METHODS TSH RIs of the total population and different races, genders, age, source of sample are established through improved Hoffmann and Katayev's method with TSH test results data from Jan 2010 to April 2012 were collected, and finally conduct comparative verification with the laboratory present RIs. RESULTS According to the improved method, we get various RIs of different sample populations. On comparing with the laboratory current RI (0.270-4.200 mIU/L) most reference change values (RCV) were within acceptable limits. Only lower limit of Han male, Uygur male and out-patient male populations outwith acceptable limits. On excluding the different values, finally, the new RI by the optimized statistical method is 0.233-4.979 mIU/L. Because the new RI expanded the current RI and was not different from the current RI, it was indicated that new RI could be used to verify the laboratory current RIs and seen as the current RI's confidence interval (CI). INFERENCE TSH RIs established by optimized Hoffmann's and Katayev's methods is viable and can be used to verify RIs provided by manufacturers or other laboratories.
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Affiliation(s)
- Y Feng
- The Clinical Laboratory Center, The Tumor Hospital Affiliated to Xin Jiang Medical University, Urumqi, China
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28
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Wang M, Wang L, Zhou Z, Gao Y, Wang L, Shi X, Gai Y, Mu C, Song L. The molecular characterization of a catalase from Chinese mitten crabEriocheir sinensis. Int J Immunogenet 2012; 40:230-40. [DOI: 10.1111/iji.12019] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2011] [Revised: 02/23/2012] [Accepted: 10/18/2012] [Indexed: 11/29/2022]
Affiliation(s)
- M. Wang
- Key Laboratory of Experimental Marine Biology; Institute of Oceanology; Chinese Academy of Sciences; Qingdao; China
| | - L. Wang
- Key Laboratory of Experimental Marine Biology; Institute of Oceanology; Chinese Academy of Sciences; Qingdao; China
| | | | | | | | | | - Y. Gai
- Key Laboratory of Experimental Marine Biology; Institute of Oceanology; Chinese Academy of Sciences; Qingdao; China
| | - C. Mu
- Key Laboratory of Experimental Marine Biology; Institute of Oceanology; Chinese Academy of Sciences; Qingdao; China
| | - L. Song
- Key Laboratory of Experimental Marine Biology; Institute of Oceanology; Chinese Academy of Sciences; Qingdao; China
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29
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Abstract
New methodology is important to the advancement of biomedical science. We recently described a polymorphism within exon IV of the ERCC1 gene, which is associated with an approximate 50% decrease in codon usage in some biological systems. In this report we show that this polymorphism can be readily demonstrated by standard manual DNA sequencing, and by a recently developed methodology which relies on spectrophotometric principles. The major advantage of this new methodology is that several-fold more samples can be assessed per unit time, at reduced cost.
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Affiliation(s)
- J Yu
- NCI,MED OVARIAN CANC SECT,MED BRANCH,DEV THERAPEUT DEPT,DIV CLIN SCI,BETHESDA,MD 20892
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30
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Yu J, Dabholkar M, Bennett W, Welsh J, Mu C, Bostickbruton F, Reed E. Platinum-sensitive and platinum-resistant ovarian cancer tissues show differences in the relationships between mRNA levels of p53, ERCC1 and XPA. Int J Oncol 2012; 8:313-7. [PMID: 21544361 DOI: 10.3892/ijo.8.2.313] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We investigated the association between p53 mRNA expression and clinically relevant surrogates of nucleotide excision repair (ERCC1 and XPA) in 28 ovarian cancer specimens. We observed that platinum-resistant tumors showed higher mRNA levels of p53, ERCC1, and XPA than platinum-sensitive tumors; mRNA expression patterns in responders differed substantially from nonresponders; and p53 expression showed a strong correlation with the expression of ERCC1, and of XPA in platinum-sensitive tumor tissues, but not with platinum-resistant tumors. 47% of the mutations from p53 sequence analysis were not related to clinical response to chemotherapy. We conclude that the p53 influence on DNA repair in human malignancy may vary substantially from tumor to tumor, and that such differences are not necessarily related to the mutational status of p53.
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Affiliation(s)
- J Yu
- NCI,DIV CANC TREATMENT,CLIN PHARMACOL BRANCH,MED OVARIAN CANC SECT,BETHESDA,MD 20892. NCI,DIV CANC ETIOL,HUMAN CARCINOGENESIS LAB,BETHESDA,MD 20892
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31
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Mu C, Jia P, Yan Z, Liu X, Li X, Liu H. Quercetin induces cell-cycle G1 arrest through elevating Cdk inhibitors p21 and p27 in human hepatoma cell line (HepG2). ACTA ACUST UNITED AC 2007; 29:179-83. [PMID: 17520098 DOI: 10.1358/mf.2007.29.3.1092095] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Quercetin is a flavonoid ubiquitously found in nature. The therapeutic effect of quercetin on human hepatoma cell line (HepG2) was evaluated in this study. Various groups were incubated with different doses of quercetin for 12-, 24-, 48- and 72-h time duration and compared with control groups. Dose- and time-dependent inhibition in HepG2 proliferation was found with quercetin treatment. At 48 h of incubation, 61.78% of the cells were arrested at G(1) phase with 25 microM/l quercetin while 89.62% were arrested at G(1) phase with 50 microM/l quercetin. Furthermore, the results indicate that quercetin increased the content of Cdk inhibitor p21 protein, which was correlated with the elevation in p53 levels during 12 h of incubation. In addition, quercetin also increased the level of Cdk inhibitor p27 protein during 24 h of incubation. From our results it can be concluded that quercetin blocks cell cycle progression at G(1) phase and exerts its growth-inhibitory effect through the increase of Cdk inhibitors p21 and p27 and tumor suppressor p53 in HepG2.
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Affiliation(s)
- C Mu
- Institute of Cell Biology, Life Science School, Lanzhou University, Lanzhou, People's Republic of China
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32
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Lewin PA, Mu C, Umchid S, Daryoush A, El-Sherif M. Acousto-optic, point receiver hydrophone probe for operation up to 100 MHz. Ultrasonics 2005; 43:815-21. [PMID: 16054665 DOI: 10.1016/j.ultras.2005.05.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2005] [Revised: 04/30/2005] [Accepted: 05/26/2005] [Indexed: 05/03/2023]
Abstract
This work describes the results of initial evaluation of a wideband acousto-optic hydrophone probe designed to operate as point receiver in the frequency range up to 100 MHz. The hydrophone was implemented as a tapered fiber optic (FO) probe sensor with a tip diameter of approximately 7 microm. Such small physical dimensions of the sensor eliminate the need for spatial averaging corrections so that true pressure-time (p-t) waveforms can be faithfully recorded. The theoretical considerations that predicted the FO probe sensitivity to be equal to 4.3 mV/MPa are presented along with a brief description of the manufacturing process. The calibration results that verified the theoretically predicted sensitivity are also presented along with a brief description of the improvements being currently implemented to increase this sensitivity level by approximately 20 dB. The results of preliminary measurements indicate that the fiber optic probes will exhibit a uniform frequency response and a zero phase shift in the frequency range considered. These features might be very useful in rapid complex calibration i.e. determining both magnitude and phase response of other hydrophones by the substitution method. Also, because of their robust design and linearity, these fiber optic hydrophones could also meet the challenges posed by high intensity focused ultrasound (HIFU) and other therapeutic applications. Overall, the outcome of this work shows that when fully developed, the FO probes will be well suited for high frequency measurements of ultrasound fields and will be able to complement the data collected by the current finite aperture piezoelectric PVDF hydrophones.
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Affiliation(s)
- P A Lewin
- School of Biomedical Engineering Science and Health Systems and Department of Electrical and Computer Engineering, Drexel University, Philadelphia, PA 19014, USA.
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Abstract
Over the past 5 years, and especially within the last year, there has been a rapid expansion of vagus nerve stimulation (VNS)-related preclinical research, as well as clinical studies in indications other than epilepsy. The research advances in understanding VNS are occurring in the midst of a blossoming of other forms of therapeutic brain stimulation, such as electroconvulsive therapy (ECT), transcranial magnetic stimulation (TMS), and deep brain stimulation (DBS). In general, improved understanding of the neurobiological effects of VNS therapy as a function of the different use parameters (frequency, intensity, pulse width, duration, dose) is beginning to guide clinical use and help determine which diseases, in addition to epilepsy, VNS might treat.
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Affiliation(s)
- Mark S George
- 502 North, IOP, Department of Psychiatry, Medical University of South Carolina, 67 President Street, Charleston, SC 29425, USA
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Chen Y, Mu C, Intes X, Chance B. Signal-to-noise analysis for detection sensitivity of small absorbing heterogeneity in turbid media with single-source and dual-interfering-source. Opt Express 2001; 9:212-24. [PMID: 19421292 DOI: 10.1364/oe.9.000212] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Previous studies have suggested that the phased-array detection can achieve high sensitivity in detecting and localizing inhomogeneities embedded in turbid media by illuminating with dual interfering sources. In this paper, we analyze the sensitivity of single-source and dual-interfering-source (phased array) systems with signal-to-noise ratio criteria. Analytical solutions are presented to investigate the sensitivity of detection using different degrees of absorption perturbation by varying the size and contrast of the object under similar configurations for single- and dual-source systems. The results suggest that dual-source configuration can provide higher detection sensitivity. The relation between the amplitude and phase signals for both systems is also analyzed using a vector model. The results can be helpful for optimizing the experimental design by combining the advantages of both single- and dual-source systems in object detection and localization.
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Mu C, Han S, Luo J, Wang X. [Analysis of environmental gradient and community of forest-swamp ecotone in Changbai mountains]. Ying Yong Sheng Tai Xue Bao 2001; 12:1-7. [PMID: 11813409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
This paper discussed the change pattern between environmental gradients and community structure, productivity and plant diversity of forest-swamp ecotones, and the mechanism forming those community's traits, which could supply a theoretical basis for conserving and managing the biological resources of ecotonal communities. By setting up sample belts along the environmental gradients on three kinds of ecotones between forests and swamps in Changbai Mountains and through investigating initial data and establishing regression models, the authors studied the dynamic pattern of species composition, diameter class and age class of dominant species, plant diversity, community productivity of forest-swamp ecotone communities with environmental gradients. The results showed that the distribution patterns of community structure characteristics, plant diversity and community productivity were consistent with the changes of environmental gradients of forest-swamp ecotones. Along the environmental gradient from swamp to forest, the displace of dominant species happened, and the species number increased by positive exponent. The diameter distribution of trees decreased by inverse curve, and the age class of trees was suited to cubic distribution. The plant diversity increased by quadratic, and the community biomass increased by cubic power curve along the environmental gradients. The above-mentioned results suggested that the relationships between communities and environmental gradients were closely related.
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Affiliation(s)
- C Mu
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016
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Li Q, Yu JJ, Mu C, Yunmbam MK, Slavsky D, Cross CL, Bostick-Bruton F, Reed E. Association between the level of ERCC-1 expression and the repair of cisplatin-induced DNA damage in human ovarian cancer cells. Anticancer Res 2000; 20:645-52. [PMID: 10810335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Nucleotide excision repair (NER) is responsible for the repair of platinum-DNA lesions. ERCC-1 is a critical gene within the NER pathway, and cells without a functional ERCC-1 do not repair cisplatin-caused DNA damage. The present study was therefore designed to evaluate the relationship between the expression of ERCC-1 and the repair of cisplatin-induced DNA adducts in human ovarian cancer cells in vitro. One hour exposure of MCAS cells to cisplatin yielded an approximately two-fold increment in the levels of ERCC-1 mRNA and ERCC-1 protein, as determined, respectively, by Northern and Western blottings. In addition, nuclear run-on assay showed that ERCC-1 gene transcription rate was increased to about the same extent as steady-state ERCC-1 mRNA and protein, in response to cisplatin treatment. However, the levels of ERCC-1 mRNA, ERCC-1 protein, and ERCC-1 transcript in MCAS cells are two-fold lower than those in A2780/CP70 cells, as previously reported. Furthermore, the repair of cisplatin-DNA adducts in MCAS cells, as measured by atomic absorption spectrometry, is also nearly two-fold less than that in A2780/CP70 cells, indicating a strong association between the level of ERCC-1 expression and the activity of excision repair in these two human ovarian tumor cell lines. These results suggest that ERCC-1 may be a useful marker to monitor the repair of platinum-DNA damage in tumor cells, and further highlight that potential pharmacological approaches which specifically inhibit ERCC-1 expression may increase cellular sensitivity to cisplatin.
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Affiliation(s)
- Q Li
- Developmental Therapeutics Department, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
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Yu JJ, Lee KB, Mu C, Li Q, Abernathy TV, Bostick-Bruton F, Reed E. Comparison of two human ovarian carcinoma cell lines (A2780/CP70 and MCAS) that are equally resistant to platinum, but differ at codon 118 of the ERCC1 gene. Int J Oncol 2000; 16:555-60. [PMID: 10675489 DOI: 10.3892/ijo.16.3.555] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
ERCC1 is an essential gene within the nucleotide excision repair process. We studied two human ovarian carcinoma cell lines for cisplatin resistance, which differed with respect to ERCC1. The A2780/CP70 cell line has been extensively studied previously, and has the wild-type ERCC1 sequence. The MCAS cell line has a recently described ERCC1 polymorphism at codon 118, which is associated with an approximate 50% reduction in codon usage. These cells did not differ with respect to p53 sequence nor p53 mRNA induction following cisplatin exposure. The induction of ERCC1 mRNA was markedly reduced in MCAS cells as compared to A2780/CP70 cells. At the IC50 cisplatin dose for each cell line, MCAS cells were less proficient at cisplatin-DNA adduct repair than A2780/CP70 cells. In absolute terms, A2780/CP70 cells repaired 3-fold as much adduct (2.7 pg/microgram DNA over 6 h vs 0.86 pg/microgram DNA); and when expressed in terms of the maximal DNA adduct load, A2780/CP70 cells repaired 50% more adduct than MCAS cells. MCAS cells had increased cytosolic inactivation of drug at the IC50 dose level, which has been previously suggested to be a compensatory cellular response for reduced DNA repair capacity. These data suggest the possibility that this specific ERCC1 polymorphism, may be associated with reduced DNA repair capacity in human ovarian cancer cells. This association may be effected through a reduction in peak production of ERCC1 mRNA, and a consequent reduction in the translation of ERCC1 mRNA into protein.
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Affiliation(s)
- J J Yu
- Medical Ovarian Cancer Section, Developmental Therapeutics Department, Medicine Branch, Division of Clinical Sciences, National Cancer Institute, Bethesda, MD 20892, USA
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Mu C, Yang L, Wang J, Hu Y, Lin H. [Wetland ecosystems formation and its protection in Yellow River Delta]. Ying Yong Sheng Tai Xue Bao 2000; 11:123-6. [PMID: 11766568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Site investigation, satellite photo analysis and historic material analysis show that the vast neonatal wetlands in Yellow River Delta were created by high concentration sediment of the river and the land-sea evolution. Affected by the regional climate, landform, geological deposition, soil, vegetation and their interactions, the wetlands covered 4.5 x 10(5) hm2, 6.84 x 10(4) hm2 of which were artificial wetlands. The wetland ecosystems changed with the waving of the Yellow River Mouth and the land development in the Delta area. From ocean to land, the sublittoral aquatic wetland, eulittoral wetland, eplittoral salt wetland, bulrush-quitch wetland, meadow wetland and land agroecosystem were developed. The wetland ecosystems had abundant biological resources, including 1524 wild animals, 300 birds and 1040 fishes, which were changed recently by the oil development and affected by the interruption of Yellow River. Wetland protection should be strengthened in resources utilization.
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Affiliation(s)
- C Mu
- Institute of Geography, Chinese Academy of Sciences, Beijing 100101
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Li Q, Ding L, Yu JJ, Mu C, Tsang B, Bostick-Bruton F, Reed E. Cisplatin and phorbol ester independently induce ERCC-1 protein in human ovarian carcinoma cells. Int J Oncol 1998; 13:987-92. [PMID: 9772291 DOI: 10.3892/ijo.13.5.987] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Nucleotide excision repair (NER) is the DNA repair pathway by which cisplatin-induced damage is removed from DNA in human cells. ERCC-1 is one of the essential proteins in NER, and is essential for life. Enhanced ERCC-1 expression has been associated with clinical and cellular resistance to cisplatin. We therefore carried out this study to investigate the effect of cisplatin on ERCC-1 protein expression in A2780/CP70 human ovarian cancer cells. Western blot analysis showed that ERCC-1 protein levels were increased to more than 3 times control after a 1 h cisplatin exposure to A2780/CP70 cells in culture. This increase was time- and concentration-dependent. The effect of cisplatin was maximal at 40 mM and peaked 24-48 h after exposure to the drug. These results extend our previous observations that ERCC-1 mRNA expression is induced by cisplatin in this system. TPA, a known AP-1 activator and tumor-promoting phorbol ester, also induced ERCC-1 protein to the same extent as cisplatin, but did not synergize with cisplatin in this regard. These findings suggest that ERCC-1 gene up-regulation in these cells can result through a DNA damage-response pathway, or through the induction of AP-1 activity, independent of the occurrence of DNA damage.
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Affiliation(s)
- Q Li
- Medical Ovarian Cancer Section, Developmental Therapeutics Department, Medicine Branch, Division of Clinical Sciences, National Cancer Institute, Bethesda, MD 20892, USA
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Yu JJ, Mu C, Dabholkar M, Guo Y, Bostick-Bruton F, Reed E. Alternative splicing of ERCC1 and cisplatin-DNA adduct repair in human tumor cell lines. Int J Mol Med 1998; 1:617-20. [PMID: 9852275 DOI: 10.3892/ijmm.1.3.617] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Alternative splicing is a common natural tool for the inhibition of function of full length gene products. We explored whether there was evidence that alternative splicing of ERCC1 may serve such a function for nucleotide excision repair. The ratio of alternatively spliced species to full length species was assessed for the protein and/or for the mRNA, for a series of human cell lines and tissues. This ratio was plotted against the amount of cisplatin-DNA adduct repair in each cell line (n=9), as measured by atomic absorbance spectrometry. As the percentage of alternatively spliced protein and/or mRNA increased, the amount of cisplatin-DNA adduct that was repaired was reduced. This inverse relationship was associated with a substantial amount of scatter (r=0.635), particularly at low levels of repair. These data demonstrate an association between alternative splicing of ERCC1, and reduction in cellular capability to repair cisplatin-DNA adduct.
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Affiliation(s)
- J J Yu
- Medical Ovarian Cancer Section, Developmental Therapeutics Department, 10/12N226, Medicine Branch, National Cancer Institute, Bethesda, MD 20892, USA
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Yu JJ, Mu C, Lee KB, Okamoto A, Reed EL, Bostick-Bruton F, Mitchell KC, Reed E. A nucleotide polymorphism in ERCC1 in human ovarian cancer cell lines and tumor tissues. Mutat Res 1997; 382:13-20. [PMID: 9360634 DOI: 10.1016/s1383-5726(97)00004-6] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.3] [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: 02/05/2023]
Abstract
We studied the DNA sequence of the entire coding region of ERCC1 gene, in five cell lines established from human ovarian cancer (A2780, A2780/CP70, MCAS, OVCAR-3, SK-OV-3), 29 human ovarian cancer tumor tissue specimens, one human T-lymphocyte cell line (H9), and non-malignant human ovary tissue (NHO). Samples were assayed by PCR-SSCP and DNA sequence analyses. A silent mutation at codon 118 (site for restriction endonuclease MaeII) in exon 4 of the gene was detected in MCAS, OVCAR-3 and SK-OV-3 cells, and NHO. This mutation was a C-->T transition, that codes for the same amino acid: asparagine. This transition converts a common codon usage (AAC) to an infrequent codon usage (AAT), whereas frequency of use is reduced two-fold. This base change was associated with a detectable band shift on SSCP analysis. For the 29 ovarian cancer specimens, the same base change was observed in 15 tumor samples and was associated with the same band shift in exon 4. Cells and tumor tissue specimens that did not contain the C-->T transition, did not show the band shift in exon 4. Our data suggest that this alteration at codon 118 within the ERCC1 gene, may exist in platinum-sensitive and platinum-resistant ovarian cancer tissues.
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Affiliation(s)
- J J Yu
- Developmental Therapeutics Department, National Cancer Institute, Bethesda, MD 20892, USA
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