51
|
Xu F, Qian M, Wei Y, Wang Y, Wang J, Li M, Zhang Y, Zhao Y, Guo X. Postural change from lateral to supine is an important mechanism enhancing cephalic spread after injection of intrathecal 0.5% plain bupivacaine for cesarean section. Int J Obstet Anesth 2015; 24:308-12. [PMID: 26357934 DOI: 10.1016/j.ijoa.2015.06.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 06/14/2015] [Accepted: 06/29/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND Spinal anesthesia is widely used for cesarean section, but the factors that affect the spread of the block in pregnant patients are still not fully explained. This study was designed to investigate the effect of postural changes on sensory block level. METHODS Thirty patients scheduled for elective cesarean section under combined spinal-epidural anesthesia were randomly allocated into three groups. After intrathecal injection of 0.5% plain bupivacaine 7.5mg, patients in group S were immediately placed in the supine position with left tilt, patients in group L5 were kept lateral for 5 min and then turned to the supine position with left tilt, and patients in group L10 were kept lateral for 10 min and then turned to the supine position with left tilt. RESULTS At 5 min, median cephalad level of sensory block was lower in groups L5 and L10 compared with group S (corrected P<0.001); at 10 min, median cephalad sensory block level was lower in group L10 compared with group S (corrected P<0.001) and group L5 (corrected P<0.001), and lower in group L5 compared with group S (corrected P=0.033); at 15 min, median cephalad level of sensory block was lower in group L10 compared with group S (corrected P=0.003) and group L5 (corrected P=0.015). CONCLUSIONS In our population, using 0.5% plain bupivacaine 7.5mg, postural change from the lateral position to the supine position is an important mechanism enhancing cephalic spread of spinal anesthesia during late pregnancy.
Collapse
|
52
|
Song T, Yan M, Shi Z, Atrens A, Qian M. Creation of bimodal porous copper materials by an annealing-electrochemical dealloying approach. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.02.217] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
53
|
Song T, Yan M, Gao Y, Atrens A, Qian M. Concurrence of de-alloying and re-alloying in a ternary Al67Cu18Sn15 alloy and the fabrication of 3D nanoporous Cu–Sn composite structures. RSC Adv 2015. [DOI: 10.1039/c4ra15622f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The creation of nanoporous Cu3Sn–Cu–Cu6Sn5 composite structures in the form of self-supporting foils through the concurrence of de-alloying and re-alloying.
Collapse
|
54
|
Yan M, Qian M, Kong C, Dargusch M. Impacts of trace carbon on the microstructure of as-sintered biomedical Ti-15Mo alloy and reassessment of the maximum carbon limit. Acta Biomater 2014; 10:1014-23. [PMID: 24200712 DOI: 10.1016/j.actbio.2013.10.034] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Revised: 09/29/2013] [Accepted: 10/28/2013] [Indexed: 10/26/2022]
Abstract
The formation of grain boundary (GB) brittle carbides with a complex three-dimensional (3-D) morphology can be detrimental to both the fatigue properties and corrosion resistance of a biomedical titanium alloy. A detailed microscopic study has been performed on an as-sintered biomedical Ti-15Mo (in wt.%) alloy containing 0.032 wt.% C. A noticeable presence of a carbon-enriched phase has been observed along the GB, although the carbon content is well below the maximum carbon limit of 0.1 wt.% specified by ASTM Standard F2066. Transmission electron microscopy (TEM) identified that the carbon-enriched phase is face-centred cubic Ti2C. 3-D tomography reconstruction revealed that the Ti2C structure has morphology similar to primary α-Ti. Nanoindentation confirmed the high hardness and high Young's modulus of the GB Ti2C phase. To avoid GB carbide formation in Ti-15Mo, the carbon content should be limited to 0.006 wt.% by Thermo-Calc predictions. Similar analyses and characterization of the carbide formation in biomedical unalloyed Ti, Ti-6Al-4V and Ti-16Nb have also been performed.
Collapse
|
55
|
Luo SD, Yang YF, Schaffer GB, Qian M. Calibration of temperature measurement by infrared pyrometry in microwave heating of powder materials: an exothermic reaction based approach. THE JOURNAL OF MICROWAVE POWER AND ELECTROMAGNETIC ENERGY : A PUBLICATION OF THE INTERNATIONAL MICROWAVE POWER INSTITUTE 2013; 47:5-11. [PMID: 24779131 DOI: 10.1080/08327823.2013.11689842] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Accurate temperature measurement remains a challenge for microwave heating of powder materials. We propose a temperature calibration method based on exothermic reactions and the resultant thermal runaway that occurs during microwave heating. The approach was demonstrated on microwave heating of four titanium alloys. Differential scanning calorimetry was used to determine the threshold reaction temperature for each selected titanium alloy. This served as a standard for the microwave heating of these titanium alloys. Infrared pyrometric temperature measurements were then calibrated by comparing the starting temperature of each thermal runaway event with the threshold reaction temperature.
Collapse
|
56
|
Jennings BR, Kuok Y, Qian M, Heinze S, Irving LB. Aspiration pneumonia secondary to laparoscopic adjustable gastric band surgery. Intern Med J 2012; 42:108-11. [PMID: 22276565 DOI: 10.1111/j.1445-5994.2011.02592.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
57
|
Gao Y, Zhou YS, Qian M, Xie ZQ, Xiong W, Luo HF, Jiang L, Lu YF. Fast growth of branched nickel monosilicide nanowires by laser-assisted chemical vapor deposition. NANOTECHNOLOGY 2011; 22:235602. [PMID: 21474870 DOI: 10.1088/0957-4484/22/23/235602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Branched nickel monosilicide (NiSi) nanowires (NWs), for the first time, have been synthesized on Ni foams by laser-assisted chemical vapor deposition using disilane precursor molecules. Studies indicate that 600 °C is the threshold temperature for the growth of a large number of branched NiSi NWs with 100-500 nm long branches extending from the main stems. Below the threshold temperature, unbranched NiSi NWs were obtained. The density of the branched NiSi NWs is relatively higher in comparison to that of the unbranched ones. The growth rate of the branched NiSi NWs at 700 °C is estimated up to 10 µm min(-1). High-resolution transmission electron microscopy and energy-dispersive x-ray spectroscopy of the branched NiSi NWs suggest that the formation of these branched nanostructures is ascribed to the Ni-dominant diffusion process. These NiSi NWs with branched nanostructures could bring them new opportunities in nanodevices.
Collapse
|
58
|
Medicherla RC, Ma MW, Qian M, Vega-Saenz de Miera E, Berman RS, Shapiro RL, Pavlick AC, Bhardwaj N, Shao Y, Osman I, Darvishian F. Impact of immune modulation on sentinel lymph node positivity and outcome in melanoma patients. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.8561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
59
|
Ma MW, Qian M, Lackaye D, Berman RS, Shapiro RL, Pavlick AC, Golfinos J, Parker E, Hernando E, Shao Y, Osman I. Primary melanoma features associated with increased risk of brain metastasis. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.8560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
60
|
Li L, Strachan DM, Davis LL, Li H, Qian M. Gadolinium Solubility Limits in Sodium-Aluminoborosilicate Glasses. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-556-329] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractGadolinium and lanthanum solubility limits in a sodium-alumino-borosilicate glass system were studied. As melting temperature increased from 1400°C to 1450°C, 1500°C and 1550°C, the solubility of gadolinium in the baseline glass 15B2O3-5A12O3-20Na2O-60SiO2 (in molar composition) increased from 10.1 to 11.3, 12.2 and 13.1 (in mole percent of Gd2O3). The enthalpy change of Gd2O3 dissolution in this baseline glass is about 43.6 kJ/mol. Boron effect on lanthanum solubility was studied using the following baseline glasses: xB2O3-20Na2O- 5Al2O3-60SiO2, where x equals to 5, 10, 15, and 20, respectively. It was found that lanthanum solubility limit increased from 8.4 to 10.3, 12.5 and 14.9 (in mole percent of La2O3) as B2O3 increased from 5.1 to 9.5, 13.1 and 16.2 mol%. Gd2O. and La2O3 have similar solubility limits. Solubility limits of mixtures containing different ratios of Gd2O3 to La2O3 in the baseline glass 15B2O3-20Na2O-5A12O3-60SiO2 were found insensitive to the ratio of La/Gd. As far as gadolinium is concerned, its solubility limit will decrease when other lanthanides are introduced.
Collapse
|
61
|
Cao Q, Qian M, Wang XF, Wang B, Wu HW, Zhu XJ, Wang YW, Guo J. Negative Feedback Regulation of Raf/MEK/ERK Cascade After Sublethal Cerebral Ischemia in the Rat Hippocampus. Neurochem Res 2010; 36:153-62. [DOI: 10.1007/s11064-010-0285-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/28/2010] [Indexed: 10/19/2022]
|
62
|
Qian M, Yujie Z, Xiaomin N, Miao Y, Fei G, Zhijian W, Bin N, Zhenxian Y, Hailong G, Dean J, Shiwei Y, Xiaoli L, Hongya H, Bin H. e0519 Rapamycin suppress KrUppel-Like Factor 2 expression: mechanism of endothelial dysfunction associated with drug-eluting stents. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
63
|
Qian M, Yujie Z, Xiaomin N, Miao Y, Fei G, Zhijian W, Bin N, Zhenxian Y, Hailong G, Dean J, Shiwei Y, Xiaoli L, Hongya H, Bin H. e0520 Statin effects in stent thrombosis induced by rapamycin releasing from drug-eluting stents through KrUppel-Like Factor 2 overexpression. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
64
|
Spence AJ, Jimenez-Flores R, Qian M, Goddik L. Short communication: Evaluation of supercritical fluid extraction aids for optimum extraction of nonpolar lipids from buttermilk powder. J Dairy Sci 2009; 92:5933-6. [PMID: 19923597 DOI: 10.3168/jds.2009-2286] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The milk fat globule membrane, present in buttermilk, contains complex lipids such as phospholipids. Microfiltration coupled with supercritical fluid extraction (SFE) may provide a method of enriching these nutritionally valuable lipids into a novel ingredient. Therefore, SFE as a method for phospholipid enrichment needs to be optimized for lipid removal effectiveness. The role of matrix additions to the buttermilk powder for extraction efficiency was evaluated. Diatomaceous earth (biosilicates), Teflon beads, and physical vibration were tested and shown to reduce total lipid by 86, 78, and 70%, respectively. Four consecutive treatments were shown to exhaust the system; however, similar extraction efficiencies were noted for 1 treatment with biosilicate addition, 2 treatments with physical vibration, or 3 treatments with added Teflon beads. The extracted lipid material consisted of the nonpolar fraction, and protein concentration was observed to increase slightly compared with the control. Although higher lipid extraction was achieved from the powder with addition of diatomaceous earth, a removable aid is ideal for an edible product.
Collapse
|
65
|
Spence A, Jimenez-Flores R, Qian M, Goddik L. Phospholipid enrichment in sweet and whey cream buttermilk powders using supercritical fluid extraction. J Dairy Sci 2009; 92:2373-81. [DOI: 10.3168/jds.2008-1534] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
66
|
Spence A, Jimenez-Flores R, Qian M, Goddik L. The influence of temperature and pressure factors in supercritical fluid extraction for optimizing nonpolar lipid extraction from buttermilk powder. J Dairy Sci 2009; 92:458-68. [DOI: 10.3168/jds.2008-1278] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
67
|
Hui Z, Betten M, Huang D, Petillo D, Qian M, Mai W, Amato R, Butler E, Teh B, Teh B. 2671. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.1086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
68
|
Gao X, Qian M, McGregor WG, Eaton JW. 193 CYTOTOXIC AND MUTAGENIC EFFECTS OF TOBACCO-BORNE FREE FATTY ACIDS. J Investig Med 2005. [DOI: 10.2310/6650.2005.00006.192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
69
|
Lu Y, Bu L, Zhou S, Jin M, Sundberg JP, Jiang H, Qian M, Shi Y, Zhao G, Kong X, Hu L. Scd1ab-Xyk: a new asebia allele characterized by a CCC trinucleotide insertion in exon 5 of the stearoyl-CoA desaturase 1 gene in mouse. Mol Genet Genomics 2004; 272:129-37. [PMID: 15278437 DOI: 10.1007/s00438-004-1043-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2004] [Accepted: 07/01/2004] [Indexed: 10/26/2022]
Abstract
We describe here a spontaneous, autosomal recessive mutant mouse suffering from skin and hair defects, which arose in the outbred Kunming strain. By haplotype analysis and direct sequencing of PCR products, we show that this mutation is a new allele of the asebia locus with a naturally occurring mutation in the Scd1 gene (a CCC insertion at nucleotide position 835 in exon 5), which codes for stearoyl-CoA desaturase 1. This mutation introduces an extra proline residue at position 279 in the Scd1 protein. The mutant mice, originally designated km/km but now assigned the name Scd1ab-Xyk (hereafter abbreviated as abXyk/abXyk), have a similar gross and histological phenotype to that reported for previously characterized allelic asebia mutations (Scd1ab, Scd1abJ, Scd1ab2J, and Scd1tm1Ntam). Histological analysis showed they were also characterized by hypoplasic sebaceous glands and abnormal hair follicles. In a cross between Kunming- abXyk/abXyk and ABJ/Le-abJ/abJ mice, all the progeny showed the same phenotype, indicating that the two mutations were non-complementing and therefore allelic. Comparisons with the other four allelic mutants indicate that the Scd1ab-Xyk mutation causes the mildest change in Scd1 function. This new mouse mutant is a good model not only for the study of scarring alopecias in humans, which are characterized by hypoplasic sebaceous glands, but also for studying the structure and function of the Scd1 protein.
Collapse
|
70
|
Qian M, Zhang XH, Mei B, Zhang P, Yan Z, Yu M. [Cytotoxic effect of Acanthamoeba trophozoite on HeLa cells]. ZHONGGUO JI SHENG CHONG XUE YU JI SHENG CHONG BING ZA ZHI = CHINESE JOURNAL OF PARASITOLOGY & PARASITIC DISEASES 2003; 19:37-40. [PMID: 12572022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
OBJECTIVE To investigate the cytotoxic effect(CTE) on human cervix cancer HeLa cells induced by five strains of pathogenic free-living Acanthamoeba. METHODS The cytotoxic effect of five isolates of Acanthamoeba on HeLa cells was investigated by light microscopy and MTT method. RESULTS The photomicrographs of HeLa cells showed a sequence of cardinal morphological features of apoptosis when HeLa cells were exposed to Acanthamoeba in a time-dependent manner at a ratio of 1:1 for 12 h. MTT method showed more than 50% of tumor cells underwent cytolysis following exposure to A. lugdunensis trophozoites, and only 18% of cells treated with A. polyphaga underwent CTE. The CTE produced by A. lugdunensis and A. quina trophozoites was more rapid than the others, beginning as early as 6 h after coincubation and resulting in cytolysis by 72 h. CONCLUSION These five strains of Acanthamoeba exhibit cytotoxic effects of varying degrees on HeLa cells, inducing apoptosis.
Collapse
|
71
|
Akervall J, Guo X, Qian M, Schoumans J, Yuhas J, Carey T, Leeser B, Bradford C, Tennvall J, Teh B. 106 Genetic and expression profiles of squamous cell carcinoma of the head and neck correlate with cisplatin sensitivity and resistance in cell lines and patients. EJC Suppl 2003. [DOI: 10.1016/s1359-6349(03)90139-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
|
72
|
Qian M, Reineccius G. Static Headspace and Aroma Extract Dilution Analysis of Parmigiano Reggiano Cheese. J Food Sci 2003. [DOI: 10.1111/j.1365-2621.2003.tb08244.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
73
|
Klesk K, Qian M. Preliminary Aroma Comparison of Marion (Rubus spp. hyb) and Evergreen (R. laciniatus L.) Blackberries by Dynamic Headspace/OSME Technique. J Food Sci 2003. [DOI: 10.1111/j.1365-2621.2003.tb05734.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
74
|
Feldman AL, Costouros NG, Wang E, Qian M, Marincola FM, Alexander HR, Libutti SK. Advantages of mRNA amplification for microarray analysis. Biotechniques 2002; 33:906-12, 914. [PMID: 12398200 DOI: 10.2144/02334mt04] [Citation(s) in RCA: 127] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Expanding applications of cDNA microarrays such as fine needle aspiration biopsy and laser capture microdissection necessitate the ability to perform arrays with minute starting amounts of RNA. While methods for amplifying RNA have been advocated, the fidelity of array results using amplified material has not been fully validated. Here we demonstrate preserved fidelity in arrays using one or two rounds of mRNA amplification, validated by downstream real-time quantitative PCR. In addition, the quality of the array data was superior to that obtained using total RNA. Based on these results, we recommend routine mRNA amplification for all cDNA microarray-based analysis of gene expression.
Collapse
|
75
|
Zogakis TG, Costouros NG, Kruger EA, Forbes S, He M, Qian M, Feldman AL, Figg WD, Alexander HR, Liu ET, Kohn EC, Libutti SK. Microarray gene expression profiling of angiogenesis inhibitors using the rat aortic ring assay. Biotechniques 2002; 33:664-6, 668, 670. [PMID: 12238776 DOI: 10.2144/02333dd02] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The rat aortic ring assay has been previously described as a useful ex vivo model for analyzing the biological activity of various inhibitors of angiogenesis. Rat aortic rings are exposed to antiangiogenic agents for a five-day incubation period. Then, the degree of microvessel outgrowth from the rings is analyzed and quantified. In contrast to most in vitro angiogenesis assays, the rat aortic ring model provides a unique microenvironment to evaluate the interaction of various cell types and biological factors for their influence on angiogenesis. Microarray analysis is an accepted method for the evaluation of gene expression profiles and can be used to better understand changes in gene expression that occur when rat aortic rings are exposed to a particular biological agent. Here we describe a method of using microarray technology to evaluate the modulation of gene expression in angiogenesis using the rat aortic ring assay.
Collapse
|