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Mou Y, Zhou K, Xu D, Yu R, Li J, Yin C, Zhou L. Enhancement of Diosgenin Production in Plantlet and Cell Cultures of Dioscorea zingiberensis by Palmarumycin C 13 from the Endophytic fungus, Berkleasmium sp. Dzf12. TROP J PHARM RES 2015. [DOI: 10.4314/tjpr.v14i2.8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Qu J, Ye H, Yu R, Lü X. [Role of efflux pumps in resistance to tigecycline in Acinetobacter baumannii]. ZHONGHUA YI XUE ZA ZHI 2014; 94:3661-3665. [PMID: 25622961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE To investigate the role of active efflux pumps in mediating the resistance of Acinetobacter baumannii to tigecycline. METHODS The in vitro susceptibility of Acinetobacter baumannii to tigecycline was determined by broth microdilution method. Minimal inhibitory concentrations (MICs) of tigecycline against Acinetobacter baumannii strains were determined by broth microdilution method with or without efflux pump inhibitors of Carbonylcyanide-m-chlorophenylhydrazone (CCCP). Efflux pumps genes including adeB, adeJ and abeM were amplified by polymerase chain reaction (PCR) and sequenced. The expression levels of these genes were measured using quantitative real-time transcription- polymerase chain reaction (RT-PCR). The modulating gene adeR and adeS were detected by PCR amplification, deoxyribonucleic acid (DNA) sequencing were performed with specific primers and were compared with the published sequence online. RESULTS The sensitive rate of Acinetobacter baumannii to tigecycline was 22.39% (15/67), active efflux of drugs existed. The adeB gene was positive in 88.06% (59/67) out of 67 Acinetobacter baumannii strains, and adeJ and abeM were 100% positive. adeB and adeJ genes expression in clinical isolates of resistant Acinetobacter baumannii increased 17.88-fold and 6.07-fold than sensitive strains, respectively. AbeM gene expression in resistant strains had not significant increase. The sequence of adeR and adeS genes in clinical isolates of sensitive and resistant strains were the same except several point mutations. CONCLUSIONS Efflux pump systems of AdeABC and AdeIJK may play a role in Acinetobacter baumannii resistant to tigecycline in western China, AbeM may be irrelevant to it. The point mutations of adeR and adeS may not up-regulate the transcription activities of adeB in this study.
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Hwang J, Choi H, Kim A, Yun J, Yu R, Woo ER, Lee D. Hibicuslide C-induced cell death in Candida albicans
involves apoptosis mechanism. J Appl Microbiol 2014; 117:1400-11. [DOI: 10.1111/jam.12633] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Revised: 06/21/2014] [Accepted: 08/26/2014] [Indexed: 12/19/2022]
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Kang YK, Rha SY, Tassone P, Barriuso J, Yu R, Szado T, Garg A, Bang YJ. A phase IIa dose-finding and safety study of first-line pertuzumab in combination with trastuzumab, capecitabine and cisplatin in patients with HER2-positive advanced gastric cancer. Br J Cancer 2014; 111:660-6. [PMID: 24960402 PMCID: PMC4134501 DOI: 10.1038/bjc.2014.356] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 04/30/2014] [Accepted: 06/02/2014] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Pertuzumab plus trastuzumab provides a more comprehensive blockade of HER2 signalling than trastuzumab alone. Therefore, we conducted a phase IIa study of the pharmacokinetics and safety of pertuzumab plus trastuzumab and chemotherapy in advanced gastric cancer (aGC). METHODS Patients received pertuzumab 840 mg for cycle 1 and 420 mg q3w for cycles 2-6 (Arm A) or pertuzumab 840 mg q3w for six cycles (Arm B). Trastuzumab, cisplatin and capecitabine were also given for six cycles, then trastuzumab q3w until disease progression or unmanageable toxicity. The co-primary endpoints were day 43 pertuzumab serum trough concentration (Cmin) and safety. RESULTS Thirty patients were randomised. Mean pertuzumab Cmin at day 43 was 40.0 μg ml(-1) (s.d.: 17.3) in Arm A and 62.7 μg ml(-1) (29.1) in Arm B. Mean day 43 Cmin in Arm A was ~37% lower than that seen in metastatic breast cancer. The safety profiles were similar between arms and treatment was well tolerated. Partial responses were achieved by 86% and 55% of patients in Arms A and B, respectively. CONCLUSIONS On the basis of the pharmacokinetic and safety data, the 840 mg q3w pertuzumab dose has been selected for a phase III study of pertuzumab, trastuzumab and chemotherapy in HER2-positive aGC.
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Xu N, Biswas PK, Dil JH, Dhaka RS, Landolt G, Muff S, Matt CE, Shi X, Plumb NC, Radović M, Pomjakushina E, Conder K, Amato A, Borisenko SV, Yu R, Weng HM, Fang Z, Dai X, Mesot J, Ding H, Shi M. Direct observation of the spin texture in SmB6 as evidence of the topological Kondo insulator. Nat Commun 2014; 5:4566. [PMID: 25074332 DOI: 10.1038/ncomms5566] [Citation(s) in RCA: 175] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 07/01/2014] [Indexed: 11/09/2022] Open
Abstract
Topological Kondo insulators have been proposed as a new class of topological insulators in which non-trivial surface states reside in the bulk Kondo band gap at low temperature due to strong spin-orbit coupling. In contrast to other three-dimensional topological insulators, a topological Kondo insulator is truly bulk insulating. Furthermore, strong electron correlations are present in the system, which may interact with the novel topological phase. By applying spin- and angle-resolved photoemission spectroscopy, here we show that the surface states of SmB6 are spin polarized. The spin is locked to the crystal momentum, fulfilling time reversal and crystal symmetries. Our results provide strong evidence that SmB6 can host topological surface states in a bulk insulating gap stemming from the Kondo effect, which can serve as an ideal platform for investigating of the interplay between novel topological quantum states with emergent effects and competing orders induced by strongly correlated electrons.
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Yu R, Woo J, Hui E, Lee J, Poon D, Ip K, Yeung F. Feasibility and effect of a therapeutic robot PARO on moods and social interaction in older adults with declining cognitive function. ACTA ACUST UNITED AC 2014. [DOI: 10.4017/gt.2014.13.02.149.00] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Qu J, Zong Z, Yu R, Hu T, Ye H, Lu X. Impact of test methodology, media type and ion content on the susceptibility of Acinetobacter spp. to tigecycline. J Antimicrob Chemother 2014; 69:1710-1. [DOI: 10.1093/jac/dkt546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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108
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Portou M, Yu R, Shi-wen X, Abraham D, Hamilton G, Baker D, Tsui J. Hyperglycaemia Exaggerates Ischaemia Induced Tissue Damage in Dermal Fibroblasts Through MyD88 Dependant Toll-like Receptor 4 Activation. Eur J Vasc Endovasc Surg 2014. [DOI: 10.1016/j.ejvs.2014.03.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lademann J, Köcher W, Yu R, Meinke MC, Na Lee B, Jung S, Sterry W, Darvin ME. Cutaneous carotenoids: the mirror of lifestyle? Skin Pharmacol Physiol 2014; 27:201. [PMID: 24714060 DOI: 10.1159/000357222] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Accepted: 11/05/2013] [Indexed: 11/19/2022]
Abstract
Carotenoids could serve as marker substances of the antioxidant status of the human skin. In the present study, an optical skin scanner was used to analyse the carotenoid concentration obtained from 4 volunteers over a period of 13 days. The measurements were taken daily at different time points. In addition, the volunteers were asked to keep track of their daily nutritional behaviour and stress situations in a diary. It was found that the carotenoid values reflect clearly the nutritional behaviour and stress situations of the volunteers. While a steady, increased intake of fruit and vegetables resulted in a gradual increase in the dermal carotenoid values for several days, stressful situations entailed an immediate decline in these values. Although the impact of healthy nutrition on the antioxidant protection system is generally known and notwithstanding the small number of cases, the present study clearly demonstrates that the avoidance and/or reduction of stress is similarly important in order not to counteract or nullify the results achieved by healthy nutrition.
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Wang X, Zhang X, Zong Z, Yu R, Lv X, Xin J, Tong C, Hao Q, Qin Z, Xiong Y, Liu H, Ding G, Hu C. Biapenem versus meropenem in the treatment of bacterial infections: a multicenter, randomized, controlled clinical trial. Indian J Med Res 2013; 138:995-1002. [PMID: 24521647 PMCID: PMC3978993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND & OBJECTIVES Biapenem is a newly developed carbapenem to treat moderate and severe bacterial infections. This multicenter, randomized, parallel-controlled clinical trial was conducted to compare the clinical efficacy, bacterial eradication rates and safety of biapenem and meropenem in the treatment of bacterial lower respiratory tract infections and urinary tract infections (UTIs) at nine centres in China. METHODS Patients diagnosed with bacterial lower respiratory tract infections or UTIs were randomly assigned to receive either biapenem (300 mg every 12 h) or meropenem (500 mg every 8 h) by intravenous infusion for 7 to 14 days according to their disease severity. The overall clinical efficacy, bacterial eradication rates and drug-related adverse reactions of biapenem and meropenem were analyzed. RESULTS A total of 272 enrolled cases were included in the intent-to-treat (ITT) analysis and safety analysis. There were no differences in demographics and baseline medical characteristics between biapenem group and meropenem group. The overall clinical efficacies of biapenem and meropenem were not significantly different, 94.70 per cent (125/132) vs. 93.94 per cent (124/132). The overall bacterial eradication rates of biapenem and meropenem showed no significant difference, 96.39 per cent (80/83) vs. 93.75 per cent (75/80). Drug-related adverse reactions were comparable in biapenem and meropenem groups with the incidence of 11.76 per cent (16/136) and 15.44 per cent (21/136), respectively. The most common symptoms of biapenem-related adverse reactions were rash (2.2%) and gastrointestinal distress (1.5%). INTERPRETATION & CONCLUSIONS Biapenem was non-inferior to meropenem and was well-tolerated in the treatment of moderate and severe lower respiratory tract infections and UTIs.
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Yu R, Yau F, Ho SC, Woo J. Longitudinal changes in physical activity levels over 5 years and relationship to cardiorespiratory fitness in Chinese midlife women. J Sports Med Phys Fitness 2013; 53:680-686. [PMID: 24247192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
AIM Better understanding the impact of changes in physical activity levels on cardiorespiratory fitness, as measured by maximal oxygen uptake (VO(2max)) may inform preventive interventions. We aimed to determine longitudinal changes in physical activity levels over 5 years and the relationship between these changes with VO(2max) in a sample of Chinese midlife women. METHODS A total of 184 Chinese women aged 50-64 years in Hong Kong were enrolled for this study. Physical activity was assessed with the modified Chinese Baecke questionnaire at baseline (2002-2004) and follow-up (2008-2009). VO(2max) was measured with a symptom-limited maximal exercise test on an electrically braked cycle ergometer at follow-up. RESULTS Compared with subjects who were persistently inactive, those who were increasingly/persistently active had significantly higher levels of VO(2max) (P<0.05). Being persistently active was also independently associated with a high level of VO(2max) (OR: 4.4, 95%CI: 1.0-19.2). However, the rate of decline in VO(2max) with age was apparently greater in persistently active subjects compared with their persistently inactive peers, but the differences were not statistically significant. CONCLUSION Our findings suggest that maintaining a high level of physical activity may lead to higher levels of VO(2max).
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Wang X, Qiao F, Yu R, Gao Y, Zong Z. Clonal diversity of Acinetobacter baumannii clinical isolates revealed by a snapshot study. BMC Microbiol 2013; 13:234. [PMID: 24144168 PMCID: PMC3815251 DOI: 10.1186/1471-2180-13-234] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 10/18/2013] [Indexed: 02/05/2023] Open
Abstract
Background Acinetobacter baumannii is a notorious opportunistic pathogen mainly associated with hospital-acquired infections. Studies on the clonal relatedness of isolates could lay the foundation for effective infection control. A snapshot study was performed to investigate the clonal relatedness of A. baumannii clinical isolates in our local settings. Results Among 82 non-repetitive Acinetobacter spp. clinical isolates that were recovered during a period of four days in 13 hospitals in Sichuan, Southwest China, 67 isolates were identified as A. baumannii. Half of the 67 A. baumannii isolates were non-susceptible to carbapenems. blaOXA-23 was the only acquired carbapenemase gene detected, present in 40 isolates including five carbapenem-susceptible ones. The isolates belonged to 62 pulsotypes determined by PFGE and 31 sequence types (ST) by multi-locus sequence typing. Forty-three isolates belonged to the globally-disseminated clonal complex 92, among which ST75, ST92 and ST208 were the most common sequence types. Conclusions Clinical isolates of A. baumannii were diverse in clonality in this snapshot study. However, most of the isolates belonged to the globally-distributed clonal complex CC92. ST75, ST92 and ST208 were the most common types in our region. In particular, ST208 might be an emerging lineage carrying blaOXA-23.
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Zhu G, Geng J, Ge H, Shi A, Yu R, Yang C. A Randomized Phase 2 Trial Comparing Weekly Usage and Every Triweekly Usage of Docetaxel and Platinum in Concurrent Chemoradiation Therapy for Patients With Locally-Advanced Non-Small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Chen S, Yin Y, Chen X, Dai X, Yu R, Han Y, Unemo M. P3.288 Antimicrobial Susceptibility and Molecular Epidemiologic Clusters of Neisseria GonorrhoeaeStrains in 2007 and 2012 in Nanjing, China. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Wang X, Chen T, Yu R, Lü X, Zong Z. Acinetobacter pittii and Acinetobacter nosocomialis among clinical isolates of the Acinetobacter calcoaceticus-baumannii complex in Sichuan, China. Diagn Microbiol Infect Dis 2013; 76:392-5. [PMID: 23639796 DOI: 10.1016/j.diagmicrobio.2013.03.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 03/22/2013] [Accepted: 03/27/2013] [Indexed: 02/05/2023]
Abstract
Among 82 clinical isolates of the Acinetobacter calcoaceticus-baumannii complex recovered in 13 hospitals of Sichuan, China, in 2011, 13 were Acinetobacter pittii and 2 were Acinetobacter nosocomialis. Multilocus sequence typing revealed a novel sequence type (ST) of A. nosocomialis and 7 novel STs of A. pittii. Most isolates were hospital-acquired and colonized in the respiratory tract, while 6 cases with pneumonia due to A. pittii were identified. This study provided a snapshot of the local incidence of A. pittii and A. nosocomialis.
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McGregor RA, Kwon EY, Shin SK, Jung UJ, Kim E, Park JHY, Yu R, Yun JW, Choi MS. Time-course microarrays reveal modulation of developmental, lipid metabolism and immune gene networks in intrascapular brown adipose tissue during the development of diet-induced obesity. Int J Obes (Lond) 2013; 37:1524-31. [PMID: 23628853 DOI: 10.1038/ijo.2013.52] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Revised: 03/21/2013] [Accepted: 03/23/2013] [Indexed: 02/06/2023]
Abstract
OBJECTIVE The aim of this study was to establish the time-course of molecular events in intrascapular brown adipose tissue (iBAT) during the development of diet-induced obesity using microarrays and molecular network analysis. DESIGN C57BL/6J male inbred mice were fed a high-fat diet (HFD) or normal diet (ND) and killed at multiple time-points over 24 weeks. METHODS Global transcriptional changes in iBAT were determined by time-course microarrays of pooled RNA (n=6, pools per time-point) at 2, 4, 8, 20 and 24 weeks using Illumina MouseWG-6 v2.0 Beadchips. Molecular networks were constructed using the Ingenuity knowledgebase based on differentially expressed genes at each time-point. RESULTS Body weight and subcutaneous adipose were progressively increased over 24 weeks, whereas iBAT was significantly increased between 6 and 12 weeks in HFD-fed C57BL/6J mice compared with controls. Blood glucose and insulin levels were increased between 16 and 24 weeks. Time-course microarrays, revealed 155 differentially expressed genes at one or more time-points over 24 weeks in the iBAT of HFD-fed mice compared with controls. Time-course network analysis revealed a network of skeletal muscle development genes that was activated between 2 and 4 weeks, subsequently a network of immune trafficking genes was activated at 8 weeks. After 20 and 24 weeks, multiple lipid metabolism and immune response networks were activated. Several target genes identified by time-course microarrays were independently validated using RT-qPCR. Tnnc1 was upregulated early between 2 and 4 weeks, later Cd68 and Col1a1 were upregulated between 20 and 24 weeks, whereas 11β-hydroxysteroid dehydrogenase (Hsd11b1) was consistently downregulated during the development of diet-induced obesity. CONCLUSION Molecular networks in iBAT are modulated in a time-dependent manner in response to a HFD. A broad range of gene targets exists to alter molecular changes within iBAT during the development of diet-induced obesity.
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Yu R, Ho S, Woo J. Prevalence and incidence of the metabolic syndrome over 5 years and relationship to the development of carotid atherosclerosis in mid-life Chinese women. Int J Cardiol 2013. [DOI: 10.1016/s0167-5273(13)70595-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Shen J, Yu R. Perioperative management of pheochromocytoma: the heart of the issue. MINERVA ENDOCRINOL 2013; 38:77-93. [PMID: 23435444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Pheochromocytoma is an endocrine tumor derived from the adrenal medulla and paraganglia. Pheochromocytoma presents with a wide spectrum of symptoms, from a silent adrenal mass to cardiac arrest. Perioperative management of pheochromocytoma is critical for preventing perioperative cardiovascular complications. Traditionally, perioperative management focuses on blood pressure control, which has generated considerable controversy. In this review, we suggest that perioperative management should focus more on treating subclinical and clinical pheochromocytoma-induced cardiomyopathy. We first describe the natural history of pheochromocytoma and illustrate that cardiomyopathy is present to various degrees in patients with pheochromocytoma. We then classify pheochromocytomas into 3 groups according to the risks of developing clinical cardiomyopathy. After going over perioperative physiological changes, we propose that the need for preoperative preparation depends on the risk level of the pheochromocytoma. We present the regimens for perioperative management, emphasizing that the goals of perioperative management should extend beyond blood pressure control and include improvement of cardiac function. Perioperative management in unique clinical situations is also discussed.
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Yi M, Lu DH, Yu R, Riggs SC, Chu JH, Lv B, Liu ZK, Lu M, Cui YT, Hashimoto M, Mo SK, Hussain Z, Chu CW, Fisher IR, Si Q, Shen ZX. Observation of temperature-induced crossover to an orbital-selective Mott phase in A(x)Fe(2-y)Se2 (A=K, Rb) superconductors. PHYSICAL REVIEW LETTERS 2013; 110:067003. [PMID: 23432294 DOI: 10.1103/physrevlett.110.067003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2012] [Indexed: 06/01/2023]
Abstract
Using angle-resolved photoemission spectroscopy, we observe the low-temperature state of the A(x)Fe(2-y)Se(2) (A=K, Rb) superconductors to exhibit an orbital-dependent renormalization of the bands near the Fermi level-the d(xy) bands heavily renormalized compared to the d(xz)/d(yz) bands. Upon raising the temperature to above 150 K, the system evolves into a state in which the d(xy) bands have depleted spectral weight while the d(xz)/d(yz) bands remain metallic. Combined with theoretical calculations, our observations can be consistently understood as a temperature-induced crossover from a metallic state at low temperatures to an orbital-selective Mott phase at high temperatures. Moreover, the fact that the superconducting state of A(x)Fe(2-y)Se(2) is near the boundary of such an orbital-selective Mott phase constrains the system to have sufficiently strong on-site Coulomb interactions and Hund's coupling, highlighting the nontrivial role of electron correlation in this family of iron-based superconductors.
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Yang J, Chen Y, Jia X, Luo Y, Song Q, Zhao W, Wang Y, Liu H, Zheng D, Xia Y, Yu R, Han X, Jiang G, Zhou Y, Zhou W, Hu X, Liang L, Han L. Dissemination and characterization of NDM-1-producing Acinetobacter pittii in an intensive care unit in China. Clin Microbiol Infect 2012; 18:E506-13. [DOI: 10.1111/1469-0691.12035] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yang HX, Tian HF, Wang Z, Qin YB, Ma C, Li JQ, Cheng ZY, Yu R, Zhu J. Effect of oxygen stoichiometry in LuFe2O(4-δ) and its microstructure observed by aberration-corrected transmission electron microscopy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:435901. [PMID: 23032863 DOI: 10.1088/0953-8984/24/43/435901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A series of oxygen deficient LuFe(2)O(4-δ) materials have been prepared under a controlled oxygen partial-pressure atmosphere. Measurements of magnetization reveal that the increase of oxygen deficiencies could evidently depress the ferrimagnetic phase transition temperature (T(N)). In additional to the well-known charge ordering within the (11(-)0) crystal plane, a visible structural modulation with q = (0,1/4.2,7/8) commonly appears on the (100) plane in the oxygen deficient samples. An aberration-corrected transmission electron microscopy study on the oxygen deficient samples demonstrates the presence of oxygen vacancies and local structural distortion. The atomic structural features in correlation with the structural modulation, distortion of the FeO(5) polyhedron and the (001) twinning domains have been also examined.
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Li A, Ma J, Cao J, Wang Q, Yu R, Thomas K, Quilliam M. Analysis of paralytic shellfish toxins and their metabolites in shellfish from the North Yellow Sea of China. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2012; 29:1455-64. [DOI: 10.1080/19440049.2012.699005] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Fan W, Downes M, Atkins A, Yu R, Evans RM. Nuclear receptors and AMPK: resetting metabolism. COLD SPRING HARBOR SYMPOSIA ON QUANTITATIVE BIOLOGY 2012; 76:17-22. [PMID: 22411605 PMCID: PMC3870013 DOI: 10.1101/sqb.2012.76.010470] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Obesity, and in particular central adiposity, is a key feature of metabolic syndrome, which includes trends toward increased triglycerides, insulin resistance, high blood pressure, hypercholesterolemia, and heart disease. It has a prevalence of 25% or more and is a dominant component of the health care budgets in Western societies. In addition to genetic causes, high-fat diets and disrupted sleep patterns have major influences on the development of metabolic syndrome. Recent studies have demonstrated active roles for the nuclear receptor superfamily and the energy-sensing kinase adenosine monophosphate (AMP)-activated protein kinase (AMPK) in regulating metabolism and circadian rhythm. In this chapter, we review these findings and attempt to develop a better understanding of the interplay between metabolism and circadian rhythm and their coordinated regulation by nuclear receptors and AMPK. This supraregulatory network may be considered a target for novel therapeutic applications against metabolic syndrome.
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Yu R. Sizable but clinically inapparent adrenal pheochromocytomas. J Endocrinol Invest 2012; 35:349-50. [PMID: 22555409 DOI: 10.1007/bf03345427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Custers J, Lorenzer KA, Müller M, Prokofiev A, Sidorenko A, Winkler H, Strydom AM, Shimura Y, Sakakibara T, Yu R, Si Q, Paschen S. Destruction of the Kondo effect in the cubic heavy-fermion compound Ce3Pd20Si6. NATURE MATERIALS 2012; 11:189-194. [PMID: 22231597 DOI: 10.1038/nmat3214] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Accepted: 11/25/2011] [Indexed: 05/31/2023]
Abstract
How ground states of quantum matter transform between one another reveals deep insights into the mechanisms stabilizing them. Correspondingly, quantum phase transitions are explored in numerous materials classes, with heavy-fermion compounds being among the most prominent ones. Recent studies in an anisotropic heavy-fermion compound have shown that different types of transitions are induced by variations of chemical or external pressure, raising the question of the extent to which heavy-fermion quantum criticality is universal. To make progress, it is essential to broaden both the materials basis and the microscopic parameter variety. Here, we identify a cubic heavy-fermion material as exhibiting a field-induced quantum phase transition, and show how the material can be used to explore one extreme of the dimensionality axis. The transition between two different ordered phases is accompanied by an abrupt change of Fermi surface, reminiscent of what happens across the field-induced antiferromagnetic to paramagnetic transition in the anisotropic YbRh2Si2. This finding leads to a materials-based global phase diagram--a precondition for a unified theoretical description.
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