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| 1 | PDX1.1-dependent biosynthesis of vitamin B6 protects roots from ammonium-induced oxidative stress显示文摘Despite serving as a major inorganic nitrogen source for plants,ammonium causes toxicity at elevated con-centrations,inhibiting root elongation early on.While previous studies have shown that ammonium-inhibited root development relates to ammonium uptake and formation of reactive oxygen species(ROS)in roots,it remains unclear about the mechanisms underlying the repression of root growth and how plants cope with this inhibitory effect of ammonium.In this study,we demonstrate that ammonium-induced apo-plastic acidification co-localizes with Fe precipitation and hydrogen peroxide(H_(2)O_(2))accumulation along the stele of the elongation and differentiation zone in root tips,indicating Fe-dependent ROS formation.By screening ammonium sensitivity in T-DNA insertion lines of ammonium-responsive genes,we identified PDX1.1,which is upregulated by ammonium in the root stele and whose product catalyzes de novo biosyn-thesis of vitamin B6.Root growth of pdx1.1 mutants is hypersensitive to ammonium,while chemical complementation or overexpression of PDX1.1 restores root elongation.This salvage strategy requires non-phosphorylated forms of vitamin B6 that are able to quench ROS and rescue root growth from ammo-nium inhibition.Collectively,these results suggest that PDX1.1-mediated synthesis of non-phosphorylated B6 vitamers acts as a primary strategy to protect roots from ammonium-dependent ROS formation. | Ying Liu Rodolfo A.Maniero Ricardo F.H.Giehl Michael Melzer Priscille Steensma Gabriel Krouk Teresa B.Fitzpatrick Nicolaus von Wirén | 2022 | Molecular Plant2022，15，5： | 3 |
| 2 | 中国企业集团内部的FDI溢出效应研究显示文摘本文采用中国规模以上工业企业2000至2006年的统计数据,分析了企业集团内部的子公司引入FDI对其它内资子公司的经济绩效的影响。结果表明,在控制企业规模等因素后,集团引入FDI对内资子公司的经济绩效产生正的溢出,同时以上关系受到制度环境因素和集团内部结构因素的调节作用的影响;内资子公司所在区域产品市场的发育成熟度会正向促进集团FDI的技术溢出效应,而内资子公司所在区域要素市场的发育成熟度会削弱集团FDI的溢出效应;内资子公司已有的技术资源丰富程度有利于增强FDI溢出效应;集团内文化差异小的外资(港澳台资)相比于文化差异大的外资(其它外资)会带来更多的溢出效应。以上结论可以帮助我们更好地理解转型经济环境下企业集团的作用,以及在FDI溢出效应研究中结合制度理论视角与交易成本理论视角的必要性。 | 井润田 赵虎 Kevin Steensma | 2013 | 南开管理评论2013，16，5： | 2 |
| 3 | Multicenter Study of Decit-abine Administered Daily for 5 Days Every 4 Weeks to AdultsWith Myelodysplastic Syndromes: The Alternative Dosing forOutpatient Treatment (ADOPT) Trial显示文摘 | David P Steensma Maria R | 2009 | Clin Oncol2009，27，23： | 1 |
| 4 | Managing tacit and explicit knowledge transfer in IJVs : the role of relational embeddedness and the impact on performance显示文摘 | Dhanaraj C Lyles M A Steensma H K | 2004 | Journal of International Business Studies2004，35，11： | 1 |
| 5 | Maltotriose utilization in lager yeast strains: MTTI encodes a maltotriose transporter显示文摘 | DIETVORST J LONDESBOROUGH J STEENSMA H Y | 2005 | Yeast2005，22，： | 1 |
| 6 | Multi- center study of decitabine administered daily for 5 days every 4 weeks to adults with myelodysplastic syndromes: the alternative dosing for outpatient treatment (ADOPT) trial显示文摘 | STEENSMA D P BAER M R SLACK J L | 2009 | J Clin Oncol2009，27，23： | 1 |
| 7 | JAK2V617F in myeloid disorders:What do we know now,and where are we headed显示文摘 | Nelson ME Steensma DP | | 0，，02： | 1 |
| 8 | Symbolic or substantive document? The influence of ethics codes on financial executives' decisions显示文摘 | Stevens J M Steensma H K Harrison D A Cochran P L | | 0，，2： | 1 |
| 9 | The use of modular organizational forms: an industry-level analysis显示文摘 | SCHILLING M A STEENSMA H K | 2001 | Acade- my of Management Journal2001，，6： | 1 |
| 10 | The JAK2 V617F activating tyrosine kinase mutation is an infrequent event in both 'atypical' myeloproliferative disorders and myelodysplastic syndromes显示文摘 | STEENSMA D P DEWALD G W LASHO T L | 2005 | Blood2005，106，： | 1 |
| 11 | Evaluating Technological Collabora- tive Opportunities: Cognitive Modeling Perspective显示文摘 | Tyler B B Steensma H K | 1995 | Strategic Management Journal1995，，16： | 1 |
| 12 | Multicenter study of decitabine administered daily for 5 days every 4 weeks to adults with myelodysplastic syndromes:the alternative dosing for outpatient treatment (ADOPT)trial显示文摘 | Steensma DP Baer MR Slack JL | 2009 | J Clin Oncol2009，27，23： | 1 |
| 13 | Clostridium tertium isolated from a necrotizing soft tissue infection in a diabetic but otherwise nonimmunocompromised patient显示文摘 | STEENSMA EA ERTL CW BURKE LH | 2011 | J Am Col Certif WoundSpec2011，3，2： | 1 |
| 14 | Evaluating technological collaborative opportunities : A cognitive modeling perspective 显示文摘 | TYLER B B STEENSMA H K | 1995 | Strategic Management Journal1995，16，： | 1 |
| 15 | Multicenter study of decitabine administered daily for 5 days every 4 weeks to adults with myelodysplastic syndromes:the alternative dosing for outpatient treatment (ADOPT) trial显示文摘 | Steensma DP Baer MR Slack JL | 2009 | J Clin Oncol2009，27，23： | 1 |
| 16 | International market entry by US internet finns: An empirical analy- sis of country risk,national culture,and market size显示文摘 | Rothaermel F T Kotha S Steensma H K | 2006 | Journal of Management2006，，32： | 1 |
| 17 | Multicenter study of decitabine administered daily for 5 days every 4 weeks to adults with myelodysplastic syndromes: the alternative dosing for outpatient treatment (ADOPT) trial 显示文摘 | Steensma DP Baer MR Slack JL | 2009 | J Clin Oncol2009，27，23： | 1 |
| 18 | The use of modular organizational forms:An industry-level analysis显示文摘 | Schilling Melissa Steensma H Kevin | 2001 | Academy of Management Journal2001，44，6： | 1 |
| 19 | Multicenter study of decitabine administered daily for 5 days every 4 weeks to adults with myelodysplastic syndromes; the alternative dosing for outpatient treatment (ADOPT) trial显示文摘 | Steensma DP Baer MR Slack JL | 2009 | J Clin Oncol2009，27，23： | 1 |
| 20 | A high bone marrow plasma cell labeling index in stable plateau-phase multiple myeloma is a marker for early disease progression and death 显示文摘 | Steensma DP Gertz MA Greipp PR | 2001 | Blood2001，97，8： | 1 |
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