401
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Yang B, Wang L, Zheng H, Xue Y. P1.003 Experimental Study on Pathogenic Diversity of Different Chlamydia TrachomatisSerovars in Mouse Genital Infection. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0224] [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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402
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Mir O, Parsha K, Nguyen C, Yang B, Savitz S. E-015 Differential expression of cytokines in Mesenchymal stem cells as a potential target for Endovascular stem cell therapy. J Neurointerv Surg 2013. [DOI: 10.1136/neurintsurg-2013-010870.73] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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403
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Yang B, Gao J, Rao Z, Shen Q. Clinicopathological and prognostic significance of α5β1-integrin and MMP-14 expressions in colorectal cancer. Neoplasma 2013; 60:254-61. [PMID: 23373994 DOI: 10.4149/neo_2013_034] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The purpose of this study was to evaluate the association of expression level of α5β1-integrin and MMP-14 with clinicopathologic features and prognosis in colorectal cancer (CRC). The expressions of α5β1-integrin and MMP-14 in normal colorectal mucosa and CRC tissue were detected with immunohistochemistry. We estimated the five-year survival rate by the Kaplan-Meier method. The positive expressions rates of α5β1-integrin and MMP-14 in CRC tissue were 60.6% and 63.3% respectively, and there were significant differences on their positive expression rates between in CRC tissue and in normal colorectal mucosa(P<0.05). The expression rates of α5β1-integrin and MMP-14 in patients with poor histological differentiation, lymph node metastasis and high clinical staging were heightened. There was a significant difference (P<0.05) on the five-year survival rate for α5β1-integrin expression, which was 44.6% in positive groups and 75.5% in negative groups. And there was a significant difference (P<0.05) on the five-year survival rate for MMP-14 expression, which was 48.2% in positive group and 73.1% in negative group. The expression of α5β1-integrin and MMP-14 is correlated with the progression and metastasis of CRC, and α5β1-integrin and MMP-14 may be used as prognostic markers in CRC.
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404
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Pang T, Yang B, Qiu J, Zhang F. SU-E-T-643: Quality Study of Beam Angle Optimization Algorithm In IMRT Plan for Cervix Cancer Radiotherapy. Med Phys 2013. [DOI: 10.1118/1.4815071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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405
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Wang Y, Han J, Wu H, Yang B, Wang X. Effect of sigma phase precipitation on the mechanical and wear properties of Z3CN20.09M cast duplex stainless steel. NUCLEAR ENGINEERING AND DESIGN 2013. [DOI: 10.1016/j.nucengdes.2013.02.037] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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406
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Yang B, Huang LL, Fang K, Wang YL, Peng DP, Liu ZL, Yuang ZH. A physiologically based pharmacokinetic model for the prediction of the depletion of methyl-3-quinoxaline-2-carboxylic acid, the marker residue of olaquindox, in the edible tissues of pigs. J Vet Pharmacol Ther 2013; 37:66-82. [PMID: 23631588 DOI: 10.1111/jvp.12053] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 03/17/2013] [Indexed: 11/29/2022]
Abstract
To estimate the consumer exposure to olaquindox (OLA) residues in porcine edible tissues, a physiologically based pharmacokinetic (PBPK) model for methyl-3-quinoxaline-2-carboxylic acid (MQCA), the marker residue of OLA, was developed in pigs based on the assumptions of the flow-limited distribution, hepatic metabolism, and renal excretion. The model included separate compartments corresponding to blood, muscle, liver, kidney, adipose, and an extra compartment representing the remaining carcass. Physiological parameters were determined from literatures. Plasma protein binding, partition coefficients, and renal clearance for MQCA were determined in in vitro and in vivo studies. The metabolic conversion of OLA to MQCA was assumed as a simple, one-step process, and an apparent first-order rate constant (k) was employed to describe this metabolic process. The PBPK model was optimized and validated with plasma and tissue data from literatures and our study. Sensitivity analysis and Monte Carlo simulation were also implemented to estimate the influence of model parameters on the goodness of fit. When compared with the observed data, the PBPK model underestimated the MQCA level in all compartments at the early time points, whereas gave excellent predictions of MQCA concentration in porcine edible tissues at later time points. The correlation coefficients between the predicted and observed values were over 0.88. The consistency between the model predictions and the real residues of OLA in pigs proved the good applicability of our model in food safety risk assessment.
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407
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Yan JW, Zhu XF, Yang B, Zhang GP. Shear stress-driven refreshing capability of plastic deformation in nanolayered metals. PHYSICAL REVIEW LETTERS 2013; 110:155502. [PMID: 25167284 DOI: 10.1103/physrevlett.110.155502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2012] [Indexed: 06/03/2023]
Abstract
Severely localized deformation within shear bands can occur much more easily in a metal with nanoscale microstructures, such as nanograined and nanolayered materials. Based on atomic-scale observations, here we show that such locally large deformation (the continuous thinning of the layers) within the indentation-induced shear bands of the Cu/Au nanolayers is essentially attributed to the large shear stress component along the interface, which can refresh the capability of the interface to absorb incoming dislocations through unlocking the product of the dislocation-interface reaction. The results have implications for understanding the interface-mediated mechanisms of plastic deformation and for the engineering application of severe plastic deformation processing of metals at nanoscales.
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408
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Yang B, Xu JR, Liu XM, Yang Y, Na XF, Li M, Wang YJ. Polymorphisms of rs1799983 (G>T) and rs1800780 (A>G) of the eNOS gene associated with susceptibility to essential hypertension in the Chinese Hui ethnic population. GENETICS AND MOLECULAR RESEARCH 2013; 12:3821-9. [PMID: 23613274 DOI: 10.4238/2013.march.26.2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We investigated a possible association of polymorphism of the eNOS gene and essential hypertension in the Chinese Hui population; polymorphisms of rs2070744 (T>C), rs1799983 (G>T), rs1800780 (A>G), and rs3918181 (A>G) loci of the eNOS gene were examined. We found that the genotypic frequencies at rs1799983 and rs1800780 loci differed significantly between patients with essential hypertension and control cohorts. The allelic frequency of the rs1799983 locus also differed significantly between essential hypertension patients and non-essential hypertension controls in this population. Additionally, the G allele of the rs1799983 locus was less frequent in the essential hypertension patients than in controls, with an odds ratio (OR) value of 3.851 [95% confidence interval (95%CI) = 2.236-6.631]. This is an indication of a protective factor of essential hypertension in Chinese Hui people. Haplotype analysis using the 4 SNPs revealed 15 haplotypes. Haplotype frequencies of CGAG, TTAG, TGGG, TTGG, and TTGA were significantly different in essential hypertension patients compared to non-essential hypertension controls. Individuals with haplotypes CGAG [χ² = 7.371, OR (95%CI) = 0.352 (0.161-0.770)] and TGGG [χ² = 6.180, OR (95%CI) = 0.600 (0.400- 0.899)] appear less likely to have essential hypertension. However, Chinese Hui with the haplotype TTAG are at risk to develop essential hypertension [χ² = 10.816, OR (95%CI) = 2.689 (1.466-4.932)]. We conclude that polymorphism of the eNOS gene is associated with susceptibility to essential hypertension in the Chinese Hui population.
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409
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Linnamaa P, Nieminen K, Koulu L, Tuomasjukka S, Kallio H, Yang B, Tahvonen R, Savolainen J. Pro-inflammatory and Th2-type cytokine responses in PBMC in infants are associated with parental smoking. Clin Exp Allergy 2013; 42:1472-8. [PMID: 22994344 DOI: 10.1111/j.1365-2222.2012.04066.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND During infancy, a disturbed cytokine balance leads to an atopic immune response. Many risk factors have been associated with the development of atopy. These include parental smoking, elevated cord blood IgE, early exposure to pets and family history of atopy, but the knowledge of their impact on cytokine balance is limited. OBJECTIVE To assess the cytokines induced by mitogen in peripheral blood mononuclear cells (PBMC) of infants at 3 months and 12 months of age and their potential association with fatty acid (FA) intervention, parental atopy, atopic dermatitis and parental smoking. METHODS Infants from an intervention study using black currant seed oil (BCSO, n = 34) or placebo (n = 34) were included. PBMC samples were taken at the age of 3 and 12 months. Signs of atopic dermatitis and parental smoking were registered. PBMC were isolated from heparinized blood samples, stimulated with ConcanavalinA mitogen and the cytokine responses were detected at 72 h of stimulation by Luminex technology. RESULTS Children of smoking parents had elevated levels of IL-4 (P = 0.0004), IL-5 (P = 0.0002), IFN-γ (P = 0.039) and TNF (P = 0.0003) at 12 months of age. Children who had atopic dermatitis by the age of 3 months showed elevated levels of IL-5 at 3 months (P = 0.0027) and 12 months of age (P = 0.022). The production of TNF at the age of 3 months was higher (P = 0.010) and the production of IL-12 at the age of 12 months was lower (P = 0.025) in infants whose parents were atopic. BCSO intervention did not have any effect on any cytokine production or mRNA expression. CONCLUSION Children of smoking parents had highly significantly elevated levels of Th2-type cytokines IL-4, IL-5 and pro-inflammatory cytokine TNF. The detrimental effects of parental smoking on the child's immune function should lead us to pay more attention to supporting parents to stop smoking.
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410
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Choi H, Yang B, Cheung K, Yu S. EP-1165: Correlation between Tomo HD functional status and TQA data trends. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)33471-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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411
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Shi AW, Chen ML, Yang B, Cao KJ, Kong XQ. A morphological study of the left atrial appendage in chinese patients with atrial fibrillation. J Int Med Res 2013; 40:1560-7. [PMID: 22971509 DOI: 10.1177/147323001204000436] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE Using angiography, this study examined left atrial appendage (LAA) morphology in Chinese patients with atrial fibrillation (AF) or congenital atrial septal defects (ASD), to provide data that might aid the design of new LAA-occluding devices to prevent cardioembolism and stroke in patients with AF. METHODS Patients with AF or ASD were enrolled. The LAA was visualized angiographically; its dimensions were measured and the emptying fraction was calculated. RESULTS A total of 45 patients with AF and 30 patients with ASD were included in the study. LAA morphology was classified into eight categories. The majority of patients with AF had tube-shaped LAAs with a single lobe; the most common LAA morphologies in patients with ASD were irregular or sphere-like, with multiple lobes. Patients with AF had significantly larger LAAs with significantly lower emptying fractions compared with LAAs of patients with ASD. CONCLUSIONS The LAA demonstrated considerable morpho logical variability in terms of its size, shape and number of lobes. The design of new occluding devices must take into account the size and shape of the LAA in patients with AF.
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412
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Lobo N, Yang B, Rizvi M, Ma D. Hypothermia and xenon: Novel noble guardians in hypoxic-ischemic encephalopathy? J Neurosci Res 2013; 91:473-8. [DOI: 10.1002/jnr.23178] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 09/25/2012] [Accepted: 10/19/2012] [Indexed: 01/13/2023]
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413
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Cao Z, Li F, Okonkwo CM, van den Boom HPA, Chen M, Yang B, Zou S, Tangdiongga E, Chen L, Koonen AMJ. Synchronized signaling delivery for broadband 60 GHz in-building optical wireless network based on digital frequency division multiplexing and digital Nyquist shaping. OPTICS EXPRESS 2013; 21:270-275. [PMID: 23388920 DOI: 10.1364/oe.21.000270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A simple and low-cost synchronized signaling delivery scheme has been proposed for a 60 GHz in-building optical wireless network with 12.7Gbps throughput based on digital frequency division multiplexing and digital Nyquist shaping.
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414
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Zhong R, Liu L, Zou L, Sheng W, Zhu B, Xiang H, Chen W, Chen J, Rui R, Zheng X, Yin J, Duan S, Yang B, Sun J, Lou J, Liu L, Xie D, Xu Y, Nie S, Miao X. Genetic variations in the TGF signaling pathway, smoking and risk of colorectal cancer in a Chinese population. Carcinogenesis 2012; 34:936-42. [DOI: 10.1093/carcin/bgs395] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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415
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Jacobsen SC, Brøns C, Bork-Jensen J, Ribel-Madsen R, Yang B, Lara E, Hall E, Calvanese V, Nilsson E, Jørgensen SW, Mandrup S, Ling C, Fernandez AF, Fraga MF, Poulsen P, Vaag A. Effects of short-term high-fat overfeeding on genome-wide DNA methylation in the skeletal muscle of healthy young men. Diabetologia 2012; 55:3341-9. [PMID: 22961225 DOI: 10.1007/s00125-012-2717-8] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Accepted: 08/08/2012] [Indexed: 10/27/2022]
Abstract
AIMS/HYPOTHESIS Energy-dense diets that are high in fat are associated with a risk of metabolic diseases. The underlying molecular mechanisms could involve epigenetics, as recent data show altered DNA methylation of putative type 2 diabetes candidate genes in response to high-fat diets. We examined the effect of a short-term high-fat overfeeding (HFO) diet on genome-wide DNA methylation patterns in human skeletal muscle. METHODS Skeletal muscle biopsies were obtained from 21 healthy young men after ingestion of a short-term HFO diet and a control diet, in a randomised crossover setting. DNA methylation was measured in 27,578 CpG sites/14,475 genes using Illumina's Infinium Bead Array. Candidate gene expression was determined by quantitative real-time PCR. RESULTS HFO introduced widespread DNA methylation changes affecting 6,508 genes (45%), with a maximum methylation change of 13.0 percentage points. The HFO-induced methylation changes were only partly and non-significantly reversed after 6-8 weeks. Alterations in DNA methylation levels primarily affected genes involved in inflammation, the reproductive system and cancer. Few gene expression changes were observed and these had poor correlation to DNA methylation. CONCLUSIONS/INTERPRETATION The genome-wide DNA methylation changes induced by the short-term HFO diet could have implications for our understanding of transient epigenetic regulation in humans and its contribution to the development of metabolic diseases. The slow reversibility suggests a methylation build-up with HFO, which over time may influence gene expression levels.
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416
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Yang B, Sylvius N, Luo J, Nicholson ML. Transcriptome Changes in Human Renal Biopsy Tissues from Living and Cadaveric Donors at 30 Minutes and 3 Months Post-Transplantation. Transplantation 2012. [DOI: 10.1097/00007890-201211271-00618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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417
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Cheng S, Li F, Guo J, Pei J, Ma Y, Wei Y, Yang B, Xiao Y. Developmental changes of <i>GHR</i> and <i>IGF-I</i> mRNA expression in lamb rumen. Arch Anim Breed 2012. [DOI: 10.5194/aab-55-72-2012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Abstract. Lambs from birth (0-day-old) to 56-day-old were selected in present study to investigate developmental changes of growth hormone receptor (GHR) and insulin-like growth factor I (IGF-I) mRNA expression in their rumen tissue. Forty-five lambs (5 lambs per group) were slaughtered at 0, 7, 14, 21, 28, 35, 42, 49, 56 days of age respectively for sampling the tissue of the rumen dorsal sac. The abundance of GHR and IGF-I mRNA were detected through real-time quantitative PCR method. The results indicated that the expression levels of GHR and IGF-I mRNA had similar change tendency in rumen tissue that the GHR and IGF-I mRNA abundance decreased with age from birth to 56-day-old. There was significant positive correlation between the two gene mRNA expression levels. The results suggested that GHR and IGF-I gene expression levels had the specific developmental pattern in rumen tissue.
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418
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Zhu ZH, Liu K, Xu W, Luo Z, Guo CC, Yang B, Ma T, Yuan XD, Ye WM. One-way transmission of linearly polarized light in plasmonic subwavelength metallic grating cascaded with dielectric grating. OPTICS LETTERS 2012; 37:4008-4010. [PMID: 23027261 DOI: 10.1364/ol.37.004008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We show that optical transmission of linearly polarized light through a plasmonic subwavelength metallic grating cascaded with a dielectric grating at a 45° angle to each other is asymmetric in opposite directions. A key characteristic of this asymmetric transmission is that the polarization of the transmitted light is changed. Simulation results reveal that transmission of 0.92 in one direction and 10(-5) in the opposite direction can be obtained at normal incidence at a wavelength of 1550 nm. Because of their high optical performance and loose fabrication requirements, the structures may provide practical applications in the control of light transmission.
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419
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Feng M, Yang B, Zhuang YJ, Yanagi U, Cheng XJ. A study on indoor environment contaminants related to dust mite in dwellings of allergic asthma patients and of healthy subjects. Biosci Trends 2012; 6:7-9. [PMID: 22426097 DOI: 10.5582/bst.2012.v6.1.7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This study investigated the pollution of dust mite allergens in the houses of 30 families and their infection to young allergic asthma patients in Shanghai. Medical records, family information, and dust samples were collected from the dwellings of 15 young allergic asthma patients and 15 healthy subjects. Der 1 allergen, which is a common allergen causing allergic asthma, was measured in collected dust samples using the Pharmacia Uni-CAP System. A significant correlation was found between the number of Der 1 allergens collected from floor surfaces and the number of Der 1 allergens collected from bed surfaces. Some factors influencing Der 1 allergen levels were found in this study. Relative humidity in dwellings was found to be most influential to the allergen levels. The findings suggested that traditional reduction methods for coarse particles, such as opening windows and periodic cleaning of beddings, may be effective in removing dust mite allergens.
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420
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Yang B, Bao X, Guo Q, Dong W, Li H, Gao J, Chen Y. Effects of active immunization against the recombinant second extracellular loop of sheep
β 2-adrenoceptor on growth and blood biochemical parameters of female rats. JOURNAL OF ANIMAL AND FEED SCIENCES 2012. [DOI: 10.22358/jafs/66123/2012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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421
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Ramayo-Caldas Y, Mercadé A, Castelló A, Yang B, Rodríguez C, Alves E, Díaz I, Ibáñez-Escriche N, Noguera J, Pérez-Enciso M, Fernández A, Folch J. Genome-wide association study for intramuscular fatty acid composition in an Iberian × Landrace cross1. J Anim Sci 2012; 90:2883-93. [DOI: 10.2527/jas.2011-4900] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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422
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Yang B, Sun H, Wan Y, Wang H, Qin W, Yang L, Zhao H, Yuan J, Yao B. Associations between testosterone, bone mineral density, vitamin D and semen quality in fertile and infertile Chinese men. ACTA ACUST UNITED AC 2012; 35:783-792. [PMID: 22713128 DOI: 10.1111/j.1365-2605.2012.01287.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Testosterone (T) and vitamin D (VD) interact in androgen deficient men, however, this interaction and subsequent semen quality and bone mineral density (BMD) status is not clear in infertile men. Our objective was to investigate T, VD, semen quality, BMD and their relationships in Chinese infertile men. We conducted a cross-sectional study of 559 men aged 20-40 years, including 195 fertile men, 9 infertile men with known risk factors for osteoporosis (WR) and 355 infertile men without known risk factors for osteoporosis (WOR). WOR infertile men constituted 314 oligo-, astheno-, teratospermic or normospermic infertile men (OATN men) and 41 non-obstructive azoospermic men (NOA men). Differences of parameters were assessed, and the relationships were adjusted by multiple linear regression. WOR infertile men had significantly lower T, lumbar spine and total hip BMD than fertile men (all p < 0.05). Bioavailable T (Bio-T) and 25-hydroxyvitamin D [25(OH)D] were independent determinants of BMD in WOR infertile men (all p < 0.01) but not in fertile men. After stratifying Bio-T, WOR infertile men had lower BMD than fertile men (all p < 0.05) in low Bio-T subgroups (Bio-T ≤ 11.6 nmol/L), but not high Bio-T subgroups (Bio-T > 11.6 nmol/L). 25(OH)D was an independent determinant of sperm motility and morphology in WOR OATN men (all p < 0.05), with only borderline significance in fertile men(motility: p = 0.047; morphology: p = 0.056). T determined sperm concentration (square root) and morphology in WOR OATN men (all p < 0.001). No correlations between T and 25(OH)D were found in all groups. We suggest that infertile men have lower T and BMD than fertile men. 25(OH)D and T were associated with low BMD and poor semen quality in infertile men.
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423
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Martynova Y, Yang B, Yu X, Boscoboinik JA, Shaikhutdinov S, Freund HJ. Low Temperature CO Oxidation on Ruthenium Oxide Thin Films at Near-Atmospheric Pressures. Catal Letters 2012. [DOI: 10.1007/s10562-012-0823-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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424
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Malkhandi S, Yang B, Manohar AK, Manivannan A, Prakash GKS, Narayanan SR. Electrocatalytic Properties of Nanocrystalline Calcium-Doped Lanthanum Cobalt Oxide for Bifunctional Oxygen Electrodes. J Phys Chem Lett 2012; 3:967-972. [PMID: 26286557 DOI: 10.1021/jz300181a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Calcium-doped lanthanum cobalt oxide is a promising electrocatalyst for oxygen evolution and oxygen reduction in rechargeable metal-air batteries and water electrolyzers operating with alkaline electrolyte. Nanocrystalline perovskite of composition La0.6Ca0.4CoO3 with a unique cellular internal structure was prepared at 350 °C and then annealed in air at progressively higher temperatures in the range of 600-750 °C. The samples were characterized by electrochemical techniques and X-ray photoelectron spectroscopy. The area-specific electrocatalytic activity for oxygen evolution/oxygen reduction, the oxidation state of cobalt, and the crystallite size increased with annealing temperature, while the Tafel slope remained constant. These trends provide new insights into the role of the cobalt center in oxygen evolution and oxygen reduction, and how preparation conditions can be altered to tune the activity of the cobalt center for electrocatalysis. We expect these findings to guide the design of electrocatalysts for bifunctional oxygen electrodes, in general.
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425
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Wang Y, Yang B, Townsend PD. Structural changes and relaxations monitored by luminescence. LUMINESCENCE 2012; 28:253-8. [PMID: 22511618 DOI: 10.1002/bio.2362] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 02/07/2012] [Accepted: 02/09/2012] [Indexed: 11/09/2022]
Abstract
Luminescence data have often been used to study imperfections and to characterize lattice distortions because the signals are sensitive to changes of structure and composition. Previous studies have included intentionally added probe ions such as rare earth ions to sense distortions in local crystal fields caused by modified structural environments. An under-exploited extension of this approach was to use luminescence to monitor crystalline phase changes. A current overview of this new and powerful technique shows that continuous scanning of the sample temperatures immediately offered at least three types of signatures for phase transitions. Because of high sensitivity, luminescence signals were equally responsive to structural changes from inclusions and nanoparticles. These coupled to the host material via long-range interactions and modified the host signals. Two frequently observed examples that are normally overlooked are from nanoparticle inclusions of water and CO2. Examples also indicated that phase transitions were detected in more diverse materials such as superconductors and fullerenes. Finally, luminescence studies have shown that in some crystalline examples, high dose ion implantation of surface layers could induce relaxations and/or structural changes of the entire underlying bulk material. This was an unexpected result and therefore such a possibility has not previously been explored. However, the implications for ion implication are significant and could be far more general than the examples mentioned here.
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