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| 1 | In-Situ Differentiation of Acidic and Non-Acidic Tundra via Portable X-ray Fluorescence (PXRF) Spectrometry显示文摘Frozen soils or those with permafrost cover large areas of the earth's surface and support unique vegetative ecosystems. Plants growing in such harsh conditions have adapted to small niches, which allow them to survive. In northern Alaska, USA, both moist acidic and non-acidic tundra occur, yet determination of frozen soil p Hs currently requires thawing of the soil so that electrometric pH methods can be utilized. Contrariwise, a portable X-ray fluorescence(PXRF) spectrometer was used in this study to assess elemental abundances and relate those characteristics to soil pH through predictive multiple linear regressions. Two operational modes, Soil Mode and Geochem Mode, were utilized to scan frozen soils in-situ and under laboratory conditions, respectively, after soil samples were dried and ground. Results showed that lab scanning produced optimal results with adjusted coefficient of determination(R^2) of 0.88 and 0.33 and root mean squared errors(RMSEs) of 0.87 and 0.34 between elemental data and lab-determined pH for Soil Mode and Geochem Mode, respectively. Even though the presence of ice attenuated fluoresced radiation under field conditions, adjusted R^2 and RMSEs between the datasets still provided reasonable model generalization(e.g., 0.73 and 0.49 for field Geochem Mode). Principal component analysis qualitatively separated multiple sampling sites based on elemental data provided by PXRF, reflecting differences in the chemical composition of the soils studied. Summarily, PXRF can be used for in-situ determination of soil pH in arctic environments without the need for sample modification and thawing. Furthermore, use of PXRF for determination of soil pH may provide higher sample throughput than traditional eletrometric-based methods, while generating elemental data useful for the prediction of multiple soil parameters. | Somsubhra CHAKRABORTY David C. WEINDORF GARY J. MICHAELSON Chien Lu PING Ashok CHOUDHURY Tarek KANDAKJI Autumn ACREE Akriti SHARMA WANG Dandan | 2016 | Pedosphere2016，26，4： | 4 |
| 2 | Comparative effectiveness of axitinib versus sorafenib in advanced renal cell carcinoma (AXIS): a randomised phase 3 trial显示文摘 | Brian I Rini Bernard Escudier Piotr Tomczak Andrey Kaprin Cezary Szczylik Thomas E Hutson M Dror Michaelson Vera A Gorbunova Martin E Gore Igor G Rusakov Sylvie Negrier Yen-Chuan Ou Daniel Castellano Ho Yeong Lim Hirotsugu Uemura Jamal Tarazi David Cella | 2011 | The Lancet . 2011 (9807)2011，，9807： | 2 |
| 3 | Comparative effectiveness of axitinib versus sorafenib in advanced renal cell carcinoma (AXIS): a randomised phase 3 trial显示文摘 | Brian I Rini Bernard Escudier Piotr Tomczak Andrey Kaprin Cezary Szczylik Thomas E Hutson M Dror Michaelson Vera A Gorbunova Martin E Gore Igor G Rusakov Sylvie Negrier Yen-Chuan Ou Daniel Castellano Ho Yeong Lim Hirotsugu Uemura Jamal Tarazi David Cella | 2011 | The Lancet2011，，9807： | 2 |
| 4 | Axitinib treatment in patients with cytokine-refractory metastatic renal-cell cancer: a phase II study显示文摘 | Olivier Rixe Ronald M Bukowski M Dror Michaelson George Wilding Gary R Hudes Oliver Bolte Robert J Motzer Paul Bycott Katherine F Liau James Freddo Peter C Trask Sinil Kim Brian I Rini | 2007 | Lancet Oncology2007，，： | 2 |
| 5 | Activity of SUl1248, a muhitargeted inhibitor of vascular endothelial growth faclor receptor and platelet-derived growth factor receptor, in patients with metastatic renal cell carcinoma 显示文摘 | Motzer R J Michaelson MD Redman BG | 2006 | J Clin Oncol2006，24，1： | 1 |
| 6 | Correlation of Mehlich 3,Bray 1,and ammonium acetate extractable P,K,Ca and Mg for Alaska agricultural soils显示文摘 | MICHAELSON G J PING C L MITCHELL G A | 1987 | Commun Soil Sci Plant Anal1987，18，9： | 1 |
| 7 | Whole-genome se- quencing in autism identifies hot spots for de novo germline mutation显示文摘 | Michaelson JJ Shi Y Gujral M | 2012 | Cell2012，151，7： | 1 |
| 8 | Beta-catenin is a downstream el- lector of Wnt mediated tumorigenesis in the mammary gland显示文摘 | Michaelson JS Leder P | 2001 | Oncogene2001，20，37： | 1 |
| 9 | N0/NI, PNL, or LNR? The effect of lymph node number on accurate survival prediction in pancreatic ductal adenocarcinoma显示文摘 | Valsangkar NP Bush DM Michaelson JS | 2013 | J Gastrointest Surg2013，17，2： | 1 |
| 10 | Crush injury and crush syndrome显示文摘 | | 1992 | World J Surg1992，16，： | 1 |
| 11 | Sunitinib efficacy against advanced renal cell carcinoma 显示文摘 | Motzer R J Michaelson MD Rosenberg J | 2007 | J Urol2007，178，5： | 1 |
| 12 | Lipocalin-2, TWEAK,and other cytokines as urinary biomarkers for lupus nephritis 显示文摘 | Schwartz N Michaelson J S Putterman C | 2007 | Ann N Y Acad Sci2007，1202，11： | 1 |
| 13 | Prevention of acute renal failure in traumatic rhabdomyolysis 显示文摘 | Ron D Taitelman U Michaelson M | 1984 | Arch In- tern Med1984，144，： | 1 |
| 14 | Cationic de-fensins arise from charge-neutralized propeptides:a mechanism for avoiding leukocyte autocytotoxicity显示文摘 | Rayner J Couto M | 1992 | J Leukocyte Biol1992，51，： | 1 |
| 15 | Beyond and Before the Law at Guantanamo显示文摘 | Scott Michaelson Scott Cutler Shershow | 2004 | Peace Review2004，16，3： | 1 |
| 16 | Declining bone mass in men with chronic pulmonary disease: contribution of glueocortieoid treat- ment, body mass index, and gonadal function 显示文摘 | Iqbal F Michaelson J Thaler L | 1999 | Chest1999，116，6： | 1 |
| 17 | Activity of SU11248, a multitargeted inhibitor of vascular endothelial growth factor receptor and platelet-derived growth factor receptor, in patients with metastatic renal cell carcinoma 显示文摘 | Motzer R J Michaelson M D Redman B G | 2006 | J CIin Oncol2006，24，1： | 1 |
| 18 | Axltinib treatment in patients with cytokine-refractory metastatic renal-cell cancer: a phase II study 显示文摘 | RIXE O BUKOWSKI RM MICHAELSON MD | 2007 | Lancet Oncol2007，8，11： | 1 |
| 19 | Environmental enrichment stimulates neurogenesis in apolipopro-tein E3 and neuronal apoptosis in apolipoprotein E4 transgenic mice显示文摘 | Levi O Michaelson DM | 2007 | J Neurochem2007，100，1： | 1 |
| 20 | Preliminary experience with new bioactive prosthetic material for repair of hernias in infected fields显示文摘 | Franklin ME Gonzalez JJ Michaelson RP | 2002 | Hernia2002，6，4： | 1 |
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