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8篇 您的检索式:作者名="W.Armstrong"
    题名 作者 年代 出处 被引量
1A Randomized, Double‐Blind, Placebo‐Controlled Study Evaluating the Efficacy and Safety of Rifaximin for the Prevention of Travelers’ Diarrhea in US Military Personnel Deployed to Incirlik Air Base, Incirlik, Turkey显示文摘Adam W.Armstrong SefaUlukan MatthewWeiner ManalMostafa HindShaheen IsabelleNakhla David R.Tribble Mark S.Riddle 2010Journal of Travel Medicine2010,,6:2
2Characterization and utilization of a novel triflate ionic liquid stationary phase for use in comprehensive two‐dimensional gas chromatography显示文摘Vanessa R.Reid Jeffery A.Crank Daniel W.Armstrong 2008J. Sep. Science2008,,:1
3Mass spectrometry detection of basic drugs in fast chiral analyses with vancomycin stationary phases显示文摘Current trends in chiral analysis of pharmaceutical drugs are focused on faster separations and higher separation efficiencies. Core-shell or superficially porous particles(SPP) based chiral stationary phases(CSPs) provide reduced analysis times while maintaining high column efficiencies and sensitivity. In this study, mobile phase conditions suitable for chiral analyses with electrospray ionization LC-MS were systematically investigated using vancomycin as a representative CSP. The performance of a 2.7 mm SPP based vancomycin CSP(SPP-V) 10 cm×0.21 cm column was compared to that of a corresponding 5 mm fully porous particles based analogue column. The results demonstrated that the SPP-V column provides higher efficiencies, 2–5 time greater sensitivity and shorter analysis time for a set of 22 basic pharmaceutical drugs. The SPP-V was successfully applied for the analysis of the degradation products of racemic citalopram whose enantiomers could be selectively identified by MS.Hongyue Guo M.Farooq Wahab Alain Berthod Daniel W.Armstrong 2018Journal of Pharmaceutical Analysis2018,8,5:1
4Capillary electrophoretic enantioseparations using macrocyclic antibiotics as chiral selectors显示文摘Daniel W.Armstrong Usha B.Nair 2005ELECTROPHORESIS (鈥?)2005,,12:1
5生物技术生产天然调味品显示文摘目前,世界调味品市场销售额达20—30亿美元,而且还在增长。产生香和味的调味化合物其重量占世界所用食品添加剂的10—15%,但销售额却占到25%。 市场向“天然”David W.Armstrong 徐家立 1989生物工程进展1989,9,4:0
6Screening primary racemic amines for enantioseparation by derivatized polysaccharide and cyclofructan columns显示文摘It is a challenge to separate the enantiomers of native chiral amines prone to deleterious silanol interactions. Aset of 39 underivatized chiral primary amines was screened for enantiomeric separation. Seven recentlyintroduced commercial chiral columns were tested. They included six polysaccharide based chiral stationaryphases (CSP) with bonded derivatives, ChiralPak? IA, IB, IC, ID, IE and IF columns and a cyclofructanderivatized CSP, Larihc? CF6-P column. Both the normal phase (NP) mode with heptane/alcohol mobile phasesand the polar organic (PO) mode with acetonitrile/alcohol were evaluated. It was found that the cyclofructanbased CSP demonstrated the highest success rate in separating primary amines in the PO mode with only onechiral amine not resolved. It is shown that, when screening the columns, there is no standard optimal condition;an excellent mobile phase composition for one column may be poorly suited to another one. Althoughbutylamine was a good mobile phase additive for the polysaccharide columns in both PO and NP modes, it wasdetrimental to the enantio-recognition capability of the cyclofructan column. Triethylamine was the appropriatesilanol screening agent for this latter column.Yeeun Lim Zachary S.Breitbach Daniel W.Armstrong Alain Berthod 2016Journal of Pharmaceutical Analysis2016,6,6:0
7Measurements of the ablation-front trajectory and low-mode nonuniformity in direct-drive implosions using x-ray self-emission shadowgraphy显示文摘Self-emission x-ray shadowgraphy provides a method to measure the ablation-front trajectory and low-mode nonuniformity of a target imploded by directly illuminating a fusion capsule with laser beams. The technique uses time-resolved images of soft x-rays(>1 ke V) emitted from the coronal plasma of the target imaged onto an x-ray framing camera to determine the position of the ablation front. Methods used to accurately measure the ablation-front radius(δ R= ±1.15 μm), image-to-image timing(δ( t)= ±2.5 ps) and absolute timing(δt= ±10 ps) are presented.Angular averaging of the images provides an average radius measurement of δ( Rav)= ±0.15 μm and an error in velocity of δV / V= ±3%. This technique was applied on the Omega Laser Facility [Boehly et al., Opt. Commun. 133, 495(1997)] and the National Ignition Facility [Campbell and Hogan, Plasma Phys. Control. Fusion 41, B39(1999)].D.T.Michel A.K.Davis W.Armstrong R.Bahr R.Epstein V.N.Goncharov M.Hohenberger I.V.Igumenshchev R.Jungquist D.D.Meyerhofer P.B.Radha T.C.Sangster C.Sorce D.H.Froula 2015High Power Laser Science and Engineering2015,3,3:0
8溴甲烷熏蒸加利福尼亚核果上的桔小实蝇显示文摘桔小实蝇 Dacus dorsalis Hendel(双翅目:实蝇科)是夏威夷和太平洋盆地其它地区的一个严重的农业害虫。许多国家已经对从感染地区进口的易感果蔬实行检疫限制,以阻止这种害虫的传人。桔小实蝇的寄主范围包括多达250种不同作物,而且这个昆虫对加利福尼亚州的数十亿美元的果蔬工业是一个严重的威胁。虽然北美本地没有桔小实蝇,但自从1960年以来几乎每年都偶然有桔小实蝇的传入。John W.Armstrong 于复坤 1990植物检疫1990,4,3:0
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