It’s SO Easy Being Green Low and No Cost Solutions Megan Kennedy 1, 3 , Christine Naca 2, 3 Lawrence Livermore National Laboratory Lawrence Berkeley National Laboratory DOE Joint Genome Institute March 2011 The work conducted by the U.S. Department of Energy Joint Genome Institute is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02- 05CH112
绿色低成本无成本的解决方案很简单Megan Kennedy Lawrence Livermore国家实验室Lawrence Berkeley国家实验室美国能源部联合基因组研究所2011年3月由美国能源部联合基因组研究所开展的工作由美国能源部科学办公室根据合同No. 1提供支持。DE-AC02 - 05 ch112
{"title":"It's SO Easy Being Green: Low and No Cost Solutions","authors":"Megan Kennedy","doi":"10.2172/1010931","DOIUrl":"https://doi.org/10.2172/1010931","url":null,"abstract":"It’s SO Easy Being Green Low and No Cost Solutions Megan Kennedy 1, 3 , Christine Naca 2, 3 Lawrence Livermore National Laboratory Lawrence Berkeley National Laboratory DOE Joint Genome Institute March 2011 The work conducted by the U.S. Department of Energy Joint Genome Institute is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02- 05CH112","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"95 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73106140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-08DOI: 10.1128/9781555816865.CH3
B. Willing, J. Jansson
The Gut Microbiota: Ecology and Function Benjamin P. Willing 1 and Janet K. Jansson 2 Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada V6T 1Z4. Department of Ecology, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720. J.K. Jansson’s work is partially supported by the U.S. Department of Energy and LBNL under Contract No. DE- AC02-05CH11231.
肠道微生物群:生态学和功能Benjamin P. Willing 1和Janet K. Jansson 2 Michael Smith实验室，不列颠哥伦比亚大学，温哥华，BC，加拿大V6T 1Z4。劳伦斯伯克利国家实验室地球科学部生态学系，加州伯克利94720。j.k Jansson的工作得到了美国能源部和LBNL的部分支持。DE - AC02-05CH11231。
{"title":"The Gut Microbiota: Ecology and Function","authors":"B. Willing, J. Jansson","doi":"10.1128/9781555816865.CH3","DOIUrl":"https://doi.org/10.1128/9781555816865.CH3","url":null,"abstract":"The Gut Microbiota: Ecology and Function Benjamin P. Willing 1 and Janet K. Jansson 2 Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada V6T 1Z4. Department of Ecology, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720. J.K. Jansson’s work is partially supported by the U.S. Department of Energy and LBNL under Contract No. DE- AC02-05CH11231.","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"13 1","pages":"39-65"},"PeriodicalIF":0.0,"publicationDate":"2011-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75482348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
JOURNAL OF APPLIED PHYSICS 109, 07B532 (2011) Orbital moment determination in (Mn x Fe 12x ) 3 O 4 nanoparticles V. L. Pool, 1,2,a) C. Jolley, 3,4 T. Douglas, 2,3 E. A. Arenholz, 5 and Y. U. Idzerda 1,2 Department of Physics, Montana State University, Bozeman, Montana 59717, USA Center for Bio-inspired Nanomaterials, Montana State University, Bozeman, Montana 59717, USA Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, USA Astrobiology Biogeocatalysis Research Center, Montana State University, Bozeman, Montana 59717, USA Advanced Light Source, Lawrence Berkeley National Labs, Berkeley, California 94720, USA (Presented 17 November 2010; received 24 September 2010; accepted 8 December 2010; published online 7 April 2011) Nanoparticles of (Mn x Fe 1Ax ) 3 O 4 with a concentration ranging from x ¼ 0 to 1 and a crystallite size of 14–15 nm were measured using X-ray absorption spectroscopy and X-ray magnetic circular dichroism to determine the ratio of the orbital moment to the spin moment for Mn and Fe. At low Mn concentrations, the Mn substitutes into the host Fe 3 O 4 spinel structure as Mn 2þ in the tetrahedral A-site. The net Fe moment, as identified by the X-ray dichrosim intensity, is found to increase at the lowest Mn concentrations then rapidly decrease until no dichroism is observed at 20% Mn. The average Fe orbit/spin moment ratio is determined to initially be negative and small for pure Fe 3 O 4 nanoparticles and quickly go to 0 by 5%–10% Mn addition. The average Mn moment is anti-aligned to the Fe moment with an orbit/spin moment ratio of 0.12 which gradually C decreases with Mn concentration. V 2011 American Institute of Physics. [doi:10.1063/1.3562905] I. INTRODUCTION The doping of spinel ferrite nanoparticles (c-Fe 2 O 3 and Fe 3 O 4 ) with magnetic and nonmagnetic substitutional transi- tion metals has demonstrated good control of both moment and anisotropy, 1 with magnetic behavior and dopant occu- pancy sites often quite different from the bulk behavior. One example is for the biomineralization of (Mn x Fe 1Ax ) 3 O 4 nano- particles inside protein cage structures, where Mn initially substitutes as Mn 2þ into the octahedral B-site causing the moment to decrease instead of as Mn 2þ in the tetrahedral A-site, 1 creating an enhanced moment as occurs in the bulk. 2 It is unclear whether these differences are due to the gentle synthesis conditions of biomineralization, the presence of the protein encapsulation, or the reduced dimensionality of nanoparticles. A comparison of dopant occupation sites and anisotropy energies of similar nanoparticles synthesized under different conditions would be useful. For noninteracting particles, frequency dependent ac- susceptibility measurements are a useful way to determine anisotropy energies. 1,3 A related parameter to the magneto- crystalline anisotropy energy is the elemental orbital mag- netic moment as determined from energy integration of the X-ray magnet
V. L. Pool, 1,2,a) C. Jolley, 3,4 T. Douglas, 2,3 E. a . Arenholz, 5 and Y. U. Idzerda 1,2，美国蒙大拿州立大学物理系，波兹曼，蒙大拿州59717，美国蒙大拿州立大学生物启发纳米材料中心，波兹曼，蒙大拿州59717，美国蒙大拿州立大学化学与生物化学系，波兹曼，蒙大拿州59717，美国蒙大拿州立大学，波兹曼，蒙大拿州59717，美国蒙大拿州立大学，波兹曼，蒙大拿州59717，美国蒙大拿州立大学，波兹曼，蒙大拿州59717，美国天体生物学生物地理催化研究中心，蒙大拿州立大学，波兹曼，蒙大拿州59717，美国先进光源，劳伦斯伯克利国家实验室，伯克利，加州94720，美国(2010年11月17日提交;2010年9月24日收到;2010年12月8日接受;利用x射线吸收光谱和x射线磁圆二色性测量了浓度为x¼0 ~ 1、晶粒尺寸为14 ~ 15 nm的(Mn x Fe 1Ax) 3o 4纳米粒子，以确定Mn和Fe的轨道矩与自旋矩的比值。在低Mn浓度下，Mn在四面体a位上以Mn 2þ的形式取代宿主Fe 3o - 4尖晶石结构。通过x射线二色性强度确定的净铁矩在Mn浓度最低时增加，然后迅速下降，直到在Mn浓度为20%时没有二色性。纯fe3o4纳米粒子的平均Fe轨道/自旋矩比最初为负且较小，在添加5% ~ 10% Mn时，平均Fe轨道/自旋矩比迅速趋于0。Mn的平均矩与Fe的反向，轨道/自旋矩比为0.12，且随着Mn浓度的增加，轨道/自旋矩逐渐减小。V 2011美国物理研究所。[doi:10.1063/1.3562905]尖晶石铁氧体纳米粒子(c- fe2o3和fe2o3)与磁性和非磁性取代过渡金属的掺杂表现出对矩和各向异性的良好控制，其磁性行为和掺杂占据位置往往与体行为完全不同。一个例子是蛋白质笼结构内(Mn x Fe 1Ax) 3o - 4纳米颗粒的生物矿化，其中Mn最初以Mn 2þ的形式取代了八面体b位，导致力矩减小，而不是以Mn 2þ的形式取代了四面体a位，1产生了增强的力矩。目前尚不清楚这些差异是由于生物矿化的温和合成条件，蛋白质封装的存在，还是纳米颗粒的降低。比较不同条件下合成的类似纳米粒子的掺杂位置和各向异性能将是有用的。对于非相互作用粒子，频率相关的交流磁化率测量是确定各向异性能量的有效方法。与磁晶各向异性能量相关的一个参数是元素轨道磁矩，这是由x射线磁圆二色谱的能量积分确定的(使用XMCD求和规则)。主要用于单晶薄膜几何形状，这种分离每个元素的轨道力矩和自旋力矩的独特方法对纳米粒子，特别是那些发现相互作用的纳米粒子有实用价值。2实验蛋白包封颗粒(参考文献1中使用的合成路线，但不包含蛋白质)。在h2o中加入氮气去除溶解氧，并混合得到所需的[Fe 2þ]: [Mn 2þ]比例，制备12.5 mM (nh4) 2fe (so4) 2.6 h2o和12.5 mM MnCl 2溶液。将12.5 mM的金属混合物和4.17 mM的脱氧水溶液以40 ml/ H的速率加入到100 mM NaCl的脱氧水溶液中，在65℃下，通过自动滴定器添加脱氧水100 mM NaOH，将pH维持在8.5。样品经离心和去离子水三次洗涤，以去除NaCl和未反应的金属离子。用于x射线吸收光谱(XAS)和x射线磁圆二色性(XMCD)测量的样品存储在水悬浮液中，随后在Formvar涂层的TEM网格上干燥，而用于硬x射线对分布函数(PDF)分析的样品立即使用真空冻干机干燥成粉末。XAS和XMCD在伯克利国家实验室先进光源的光束线4.0.2处同时进行透射率(使用Ga光电探测器)和总电子产率(在样品电流模式下)的测量。在室温下，光子极化率设为90%，外加0.5 t的交变磁场下进行吸收测量。结果(Mn x Fe 1Ax) 3o - 4纳米颗粒在x¼0 ~ 1.0的浓度下合成，化学路线与pro- a相同。电子邮件:pool@physics.montana.edu。
{"title":"Orbital Moment Determination in (MnxFe1-x)3O4 Nanoparticles","authors":"V. L. Pool","doi":"10.1063/1.3562905","DOIUrl":"https://doi.org/10.1063/1.3562905","url":null,"abstract":"JOURNAL OF APPLIED PHYSICS 109, 07B532 (2011) Orbital moment determination in (Mn x Fe 12x ) 3 O 4 nanoparticles V. L. Pool, 1,2,a) C. Jolley, 3,4 T. Douglas, 2,3 E. A. Arenholz, 5 and Y. U. Idzerda 1,2 Department of Physics, Montana State University, Bozeman, Montana 59717, USA Center for Bio-inspired Nanomaterials, Montana State University, Bozeman, Montana 59717, USA Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, USA Astrobiology Biogeocatalysis Research Center, Montana State University, Bozeman, Montana 59717, USA Advanced Light Source, Lawrence Berkeley National Labs, Berkeley, California 94720, USA (Presented 17 November 2010; received 24 September 2010; accepted 8 December 2010; published online 7 April 2011) Nanoparticles of (Mn x Fe 1Ax ) 3 O 4 with a concentration ranging from x ¼ 0 to 1 and a crystallite size of 14–15 nm were measured using X-ray absorption spectroscopy and X-ray magnetic circular dichroism to determine the ratio of the orbital moment to the spin moment for Mn and Fe. At low Mn concentrations, the Mn substitutes into the host Fe 3 O 4 spinel structure as Mn 2þ in the tetrahedral A-site. The net Fe moment, as identified by the X-ray dichrosim intensity, is found to increase at the lowest Mn concentrations then rapidly decrease until no dichroism is observed at 20% Mn. The average Fe orbit/spin moment ratio is determined to initially be negative and small for pure Fe 3 O 4 nanoparticles and quickly go to 0 by 5%–10% Mn addition. The average Mn moment is anti-aligned to the Fe moment with an orbit/spin moment ratio of 0.12 which gradually C decreases with Mn concentration. V 2011 American Institute of Physics. [doi:10.1063/1.3562905] I. INTRODUCTION The doping of spinel ferrite nanoparticles (c-Fe 2 O 3 and Fe 3 O 4 ) with magnetic and nonmagnetic substitutional transi- tion metals has demonstrated good control of both moment and anisotropy, 1 with magnetic behavior and dopant occu- pancy sites often quite different from the bulk behavior. One example is for the biomineralization of (Mn x Fe 1Ax ) 3 O 4 nano- particles inside protein cage structures, where Mn initially substitutes as Mn 2þ into the octahedral B-site causing the moment to decrease instead of as Mn 2þ in the tetrahedral A-site, 1 creating an enhanced moment as occurs in the bulk. 2 It is unclear whether these differences are due to the gentle synthesis conditions of biomineralization, the presence of the protein encapsulation, or the reduced dimensionality of nanoparticles. A comparison of dopant occupation sites and anisotropy energies of similar nanoparticles synthesized under different conditions would be useful. For noninteracting particles, frequency dependent ac- susceptibility measurements are a useful way to determine anisotropy energies. 1,3 A related parameter to the magneto- crystalline anisotropy energy is the elemental orbital mag- netic moment as determined from energy integration of the X-ray magnet","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"79 11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75114131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
LBNL59669 ERNEST ORLANDO LAWRENCE BERKELEY NATIONAL LABORATORY J Public Health Benefits of End- Use Electrical Energy Efficiency in California: An Exploratory Study Agnes B. Lobscheid Thomas E. McKone ; Environmental Energy Technologies Division · June 2006 This work was supported by the California Energy Commission and the US Environmental Protection Agency through the U.S. Department of Energy under Contract No. DE-AC02- OSCH11231.
{"title":"Public Health Benefits of End-Use Electrical Energy Efficiency in California: An Exploratory Study","authors":"T. McKone, A. Lobscheid","doi":"10.2172/1010620","DOIUrl":"https://doi.org/10.2172/1010620","url":null,"abstract":"LBNL59669 ERNEST ORLANDO LAWRENCE BERKELEY NATIONAL LABORATORY J Public Health Benefits of End- Use Electrical Energy Efficiency in California: An Exploratory Study Agnes B. Lobscheid Thomas E. McKone ; Environmental Energy Technologies Division · June 2006 This work was supported by the California Energy Commission and the US Environmental Protection Agency through the U.S. Department of Energy under Contract No. DE-AC02- OSCH11231.","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79527501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. L. Pool, M. Klem, C. Chorney, E. Arenholz, Y. Idzerda
JOURNAL OF APPLIED PHYSICS 109, 07B529 (2011) Enhanced magnetism of Fe 3 O 4 nanoparticles with Ga doping V. L. Pool, 1,a) M. T. Klem, 2,3 C. L. Chorney, 2,3 E. A. Arenholz, 4 and Y. U. Idzerda 1 Department of Physics, Montana State University, Bozeman, Montana 59715, USA Department of Chemistry and Geochemistry, Montana Tech, Butte, Montana 59701, USA Center for Advanced Supramolecular and Nano Systems, Montana Tech, Butte, Montana 59715, USA Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA (Presented 18 November 2010; received 22 October 2010; accepted 1 December 2010; published online 5 April 2011) Magnetic (Ga x Fe 1Ax ) 3 O 4 nanoparticles with 5%–33% gallium doping (x ¼ 0.05–0.33) were measured using x-ray absorption spectroscopy and x-ray magnetic circular dichroism to determine that the Ga dopant is substituting for Fe 3þ as Ga 3þ in the tetrahedral A-site of the spinel structure, resulting in an overall increase in the total moment of the material. Frequency-dependent alternating-current magnetic susceptibility measurements showed these particles to be weakly interacting with a reduction of the cubic anisotropy energy term with Ga concentration. The element-specific dichroism spectra show that the average Fe moment is observed to increase C with Ga concentration, a result consistent with the replacement of A-site Fe by Ga. V 2011 American Institute of Physics. [doi:10.1063/1.3562196] I. INTRODUCTION Gallium doped iron oxide, (Ga x Fe 1Ax ) 3 O 4 , is interesting as it exhibits an energy-dependent photoabsorption as a func- tion of Ga concentration in bulk samples. 1 This property could be advantageous in nanoparticles providing utility for applications. Additionally, Ga-based mixed oxides have shown interesting catalytic behavior, an application that nano- particles are known to be exceptional for due to their large sur- face-to-volume ratio. 2–4 Furthermore, the doping of magnetic nanoparticles can have behaviors distinct from bulk alloys, including changes in dopant site occupation and different varia- tions of moment and anisotropy with doping concentration, making them interesting from a purely scientific standpoint. Bulk (Ga x Fe 1Ax ) 3 O 4 magnetic trends have not been fully studied, but Ga is typically present as a 3þ valence ion so it is likely to be present as a 3þ valence ion given the two options in the spinel structure. 1 The effect on the magnetic properties of doping Fe 3 O 4 with other nonmagnetic transi- tion metals of similar ionic radii, such as Zn, show that Zn preferentially substitutes for Fe 3þ as Zn 2þ in the tetrahedral coordination. For bulk Zn doped Fe 3 O 4 the total moment per unit cell increases as the tetrahedral sites become occupied by the nonmagnetic transition metal. 5 These substitutional atoms no longer partially cancel the Fe moment in the octa- hedral coordination. For Zn doping the average moment of the octahedral Fe sites also slightly increases as charge
V. L. Pool, 1,a) M. T. Klem, 2,3 C. L. Chorney, 2,3 E. a . Arenholz, 4和Y. U. Idzerda 1蒙大拿州立大学物理系，Bozeman, Montana 59715，美国蒙大拿州理工大学化学与地球化学系，Butte, Montana 59701，美国先进超分子和纳米系统中心，Montana Tech, Butte, Montana 59715，美国先进光源，劳伦斯伯克利国家实验室，美国加州伯克利94720(2010年11月18日提出;2010年10月22日收到;2010年12月1日接受;利用x射线吸收光谱和x射线磁性圆二色性测量了5%-33% (x¼0.05-0.33)镓掺杂的磁性(Ga x Fe 1Ax) 3o纳米颗粒，确定了Ga掺杂剂在尖晶石结构的四面体a位取代Fe 3þ作为Ga 3þ，导致材料的总力矩总体增加。频率相关的交流磁化率测量表明，这些粒子与立方各向异性能量项随Ga浓度的降低呈弱相互作用。元素特异性二色谱表明，随着Ga浓度的增加，平均Fe矩C增加，这与Ga取代a位Fe的结果一致。V 2011美国物理研究所。[doi:10.1063/1.3562196]引言镓掺杂氧化铁，(Ga x Fe 1Ax) 3o 4，是有趣的，因为它表现出能量依赖的光吸收作为一个函数的Ga浓度在体样品中。这一特性在纳米颗粒中具有优势，为应用提供了实用性。此外，基于ga的混合氧化物已经显示出有趣的催化行为，这是纳米粒子由于其大的表面体积比而被认为是例外的应用。2-4此外，磁性纳米颗粒的掺杂可以具有不同于块状合金的行为，包括掺杂位置的变化以及随掺杂浓度的不同矩和各向异性的变化，这使得它们从纯科学的角度来看很有趣。体(Ga x Fe 1Ax) 3o - 4磁性趋势尚未得到充分研究，但Ga通常以3þ价离子存在，因此考虑到尖晶石结构中的两种选择，它很可能以3þ价离子存在。1 .用类似离子半径的其他非磁性过渡金属(如Zn)掺杂fe3o4对磁性能的影响表明，在四面体配位中，Zn优先取代fe3 þ作为zn2 þ。对于体锌掺杂的fe3o4，当四面体位置被非磁性过渡金属占据时，单位晶胞的总力矩增加。这些取代原子不再部分抵消八面体配位中的铁矩。对于Zn掺杂，八面体Fe位的平均矩也略有增加，因为电荷的中性性要求一些八面体fe2 +转化为fe3 +。如果Ga作为Ga 3þ离子(而不是Zn 2þ)取代到四面体配位中，它应该产生类似的效果，尽管效果略有降低。纳米粒子并不总是遵循同样的趋势。性质通常取决于尺寸，其中表面效应和晶格畸变的松弛可以a)应解决对应问题的作者。电子邮件:pool@physics.montana.edu。0021-8979/2011/109(7)/07B529/3/$30.00导致纳米颗粒具有明显不同的磁性。6,7此外，纳米颗粒是出了名的依赖于合成的，而化学上温和的纳米颗粒合成过程，如蛋白质封装可能会产生一种行为，一个更苛刻的化学过程可能会显示出完全不同的行为。特别是，锌纳米粒子在蛋白质结构中的包封确实会导致锌取代四面体a位，但会产生明显不同的磁性行为，其特征是随着锌浓度的增加，纳米粒子的力矩急剧减少，与体行为相反。从简单的晶体填充论证来看，与Zn 2þ相比，Ga 3þ的离子半径减小表明，Ga掺杂剂应该比Zn更强烈地倾向于四合体配位，从而允许进一步研究特殊的矩行为。2在真空条件下，将Fe(acac)3,1,2-十六烷二醇、苯醚、油酸和油胺混合，合成了磁性(Ga x Fe 1Ax) 3o - 4纳米粒子，镓掺杂率为5%-33% (x¼0.05-0.33)。以铁(acac) 3 (0.5 mmol)、油酸(1.5mmol)、油酰胺(1.5mmol)、1,2-十六烷二醇(2.5 mmol)和苯醚(5 mL)为原料，在50 mL圆底烧瓶中真空合成fe3o4(磁铁矿)纳米颗粒。将混合物逐渐加热至200℃，退火24小时。
{"title":"Enhanced Magnetism of Fe3O4 Nanoparticles with Ga Doping","authors":"V. L. Pool, M. Klem, C. Chorney, E. Arenholz, Y. Idzerda","doi":"10.1063/1.3562196","DOIUrl":"https://doi.org/10.1063/1.3562196","url":null,"abstract":"JOURNAL OF APPLIED PHYSICS 109, 07B529 (2011) Enhanced magnetism of Fe 3 O 4 nanoparticles with Ga doping V. L. Pool, 1,a) M. T. Klem, 2,3 C. L. Chorney, 2,3 E. A. Arenholz, 4 and Y. U. Idzerda 1 Department of Physics, Montana State University, Bozeman, Montana 59715, USA Department of Chemistry and Geochemistry, Montana Tech, Butte, Montana 59701, USA Center for Advanced Supramolecular and Nano Systems, Montana Tech, Butte, Montana 59715, USA Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA (Presented 18 November 2010; received 22 October 2010; accepted 1 December 2010; published online 5 April 2011) Magnetic (Ga x Fe 1Ax ) 3 O 4 nanoparticles with 5%–33% gallium doping (x ¼ 0.05–0.33) were measured using x-ray absorption spectroscopy and x-ray magnetic circular dichroism to determine that the Ga dopant is substituting for Fe 3þ as Ga 3þ in the tetrahedral A-site of the spinel structure, resulting in an overall increase in the total moment of the material. Frequency-dependent alternating-current magnetic susceptibility measurements showed these particles to be weakly interacting with a reduction of the cubic anisotropy energy term with Ga concentration. The element-specific dichroism spectra show that the average Fe moment is observed to increase C with Ga concentration, a result consistent with the replacement of A-site Fe by Ga. V 2011 American Institute of Physics. [doi:10.1063/1.3562196] I. INTRODUCTION Gallium doped iron oxide, (Ga x Fe 1Ax ) 3 O 4 , is interesting as it exhibits an energy-dependent photoabsorption as a func- tion of Ga concentration in bulk samples. 1 This property could be advantageous in nanoparticles providing utility for applications. Additionally, Ga-based mixed oxides have shown interesting catalytic behavior, an application that nano- particles are known to be exceptional for due to their large sur- face-to-volume ratio. 2–4 Furthermore, the doping of magnetic nanoparticles can have behaviors distinct from bulk alloys, including changes in dopant site occupation and different varia- tions of moment and anisotropy with doping concentration, making them interesting from a purely scientific standpoint. Bulk (Ga x Fe 1Ax ) 3 O 4 magnetic trends have not been fully studied, but Ga is typically present as a 3þ valence ion so it is likely to be present as a 3þ valence ion given the two options in the spinel structure. 1 The effect on the magnetic properties of doping Fe 3 O 4 with other nonmagnetic transi- tion metals of similar ionic radii, such as Zn, show that Zn preferentially substitutes for Fe 3þ as Zn 2þ in the tetrahedral coordination. For bulk Zn doped Fe 3 O 4 the total moment per unit cell increases as the tetrahedral sites become occupied by the nonmagnetic transition metal. 5 These substitutional atoms no longer partially cancel the Fe moment in the octa- hedral coordination. For Zn doping the average moment of the octahedral Fe sites also slightly increases as charge","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76029881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-05DOI: 10.1016/S0166-2481(10)34012-8
S. Fendorf, P. Nico, B. Kocar, Yoko Masue, K. Tufano
{"title":"Arsenic chemistry in soils and sediments","authors":"S. Fendorf, P. Nico, B. Kocar, Yoko Masue, K. Tufano","doi":"10.1016/S0166-2481(10)34012-8","DOIUrl":"https://doi.org/10.1016/S0166-2481(10)34012-8","url":null,"abstract":"","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"9 1","pages":"357-378"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76722146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Daum, Matthew Zane, James E. Han, Megan Kennedy, Matthew San Diego, A. Copeland, Mingkun Li, S. Lucas
The U.S. Department of Energy (DOE) Joint Genome Institute's (JGI) Production Sequencing group is committed to the generation of high-quality genomic DNA sequence to support the mission areas of renewable energy generation, global carbon management, and environmental characterization and clean-up. Within the JGI's Production Sequencing group, a robust Illumina Genome Analyzer and HiSeq pipeline has been established. Optimization of the sesequencer pipelines has been ongoing with the aim of continual process improvement of the laboratory workflow, reducing operational costs and project cycle times to increases ample throughput, and improving the overall quality of the sequence generated. A sequence QC analysis pipeline has been implemented to automatically generate read and assembly level quality metrics. The foremost of these optimization projects, along with sequencing and operational strategies, throughput numbers, and sequencing quality results will be presented.
{"title":"Illumina GA IIx & HiSeq 2000 Production Sequenccing and QC Analysis Pipelines at the DOE Joint Genome Institute","authors":"C. Daum, Matthew Zane, James E. Han, Megan Kennedy, Matthew San Diego, A. Copeland, Mingkun Li, S. Lucas","doi":"10.2172/1010544","DOIUrl":"https://doi.org/10.2172/1010544","url":null,"abstract":"The U.S. Department of Energy (DOE) Joint Genome Institute's (JGI) Production Sequencing group is committed to the generation of high-quality genomic DNA sequence to support the mission areas of renewable energy generation, global carbon management, and environmental characterization and clean-up. Within the JGI's Production Sequencing group, a robust Illumina Genome Analyzer and HiSeq pipeline has been established. Optimization of the sesequencer pipelines has been ongoing with the aim of continual process improvement of the laboratory workflow, reducing operational costs and project cycle times to increases ample throughput, and improving the overall quality of the sequence generated. A sequence QC analysis pipeline has been implemented to automatically generate read and assembly level quality metrics. The foremost of these optimization projects, along with sequencing and operational strategies, throughput numbers, and sequencing quality results will be presented.","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77464353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liange Zheng, N. Spycher, Tianfu Xu, J. Apps, Y. Kharaka, J. Birkholzer
LBNL-4339E Ernest Orlando Lawrence Berkeley National Laboratory Technical Report November 2010 Modeling Studies on the Transport of Benzene and H 2 S in CO 2 -Water Systems Lawrence Berkeley National Laboratory (LBNL) Contact: Jens T. Birkholzer Ph: (510) 486-7134 Email: jtbirkholzer@lbl.gov Authors: Liange Zheng, Nicolas Spycher, Jens Birkholzer, Tianfu Xu, John Apps (LBNL) Yousif Kharaka (USGS) Submitted to: U.S. Environmental Protection Agency EPA Project Manager: Sean Porse
LBNL- 4339e欧内斯特·Orlando劳伦斯伯克利国家实验室2010年11月技术报告二氧化碳-水系统中苯和h2 S运输的建模研究劳伦斯伯克利国家实验室(LBNL)联系人:Jens T. Birkholzer Ph:(510) 486-7134电子邮件:jtbirkholzer@lbl.gov作者:郑liange, Nicolas Spycher, Jens Birkholzer，许天福，John Apps (LBNL) Yousif Kharaka (USGS)提交给:美国环境保护署EPA项目经理:Sean Porse
{"title":"Modeling Studies on the Transport of Benzene and H2S in CO2-Water Systems","authors":"Liange Zheng, N. Spycher, Tianfu Xu, J. Apps, Y. Kharaka, J. Birkholzer","doi":"10.2172/1010545","DOIUrl":"https://doi.org/10.2172/1010545","url":null,"abstract":"LBNL-4339E Ernest Orlando Lawrence Berkeley National Laboratory Technical Report November 2010 Modeling Studies on the Transport of Benzene and H 2 S in CO 2 -Water Systems Lawrence Berkeley National Laboratory (LBNL) Contact: Jens T. Birkholzer Ph: (510) 486-7134 Email: jtbirkholzer@lbl.gov Authors: Liange Zheng, Nicolas Spycher, Jens Birkholzer, Tianfu Xu, John Apps (LBNL) Yousif Kharaka (USGS) Submitted to: U.S. Environmental Protection Agency EPA Project Manager: Sean Porse","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75256269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eloise V. Dray, Myun Hwa Dunlop, L. Kauppi, J. S. Filippo, C. Wiese, M. Tsai, S. Begović, D. Schild, M. Jasin, S. Keeney, P. Sung
Homologous recombination is needed for meiotic chromosome segregation, genome maintenance, and tumor suppression. RAD51AP1 (RAD51 Associated Protein 1) has been shown to interact with and enhance the recombinase activity of RAD51. Accordingly, genetic ablation of RAD51AP1 leads to enhanced sensitivity to and also chromosome aberrations upon DNA damage, demonstrating a role for RAD51AP1 in mitotic homologous recombination. Here we show physical association of RAD51AP1 with the meiosis-specific recombinase DMC1 and a stimulatory effect of RAD51AP1 on the DMC1-mediated D-loop reaction. Mechanistic studies have revealed that RAD51AP1 enhances the ability of the DMC1 presynaptic filament to capture the duplex DNA partner and to assemble the synaptic complex, in which the recombining DNA strands are homologously aligned. We also provide evidence that functional co-operation is dependent on complex formation between DMC1 and RAD51AP1, and that distinct epitopes in RAD51AP1 mediate interactions with RAD51 and DMC1. Finally, we show that RAD51AP1 is expressed in mouse testes, and that RAD51AP1 foci co-localize with a subset of DMC1 foci in spermatocytes. These results suggest that RAD51AP1 also serves an important role in meiotic homologous recombination.
{"title":"Molecular Basis for Enhancement of the Meiotic DMCI Recombinase by RAD51AP1","authors":"Eloise V. Dray, Myun Hwa Dunlop, L. Kauppi, J. S. Filippo, C. Wiese, M. Tsai, S. Begović, D. Schild, M. Jasin, S. Keeney, P. Sung","doi":"10.2172/1011037","DOIUrl":"https://doi.org/10.2172/1011037","url":null,"abstract":"Homologous recombination is needed for meiotic chromosome segregation, genome maintenance, and tumor suppression. RAD51AP1 (RAD51 Associated Protein 1) has been shown to interact with and enhance the recombinase activity of RAD51. Accordingly, genetic ablation of RAD51AP1 leads to enhanced sensitivity to and also chromosome aberrations upon DNA damage, demonstrating a role for RAD51AP1 in mitotic homologous recombination. Here we show physical association of RAD51AP1 with the meiosis-specific recombinase DMC1 and a stimulatory effect of RAD51AP1 on the DMC1-mediated D-loop reaction. Mechanistic studies have revealed that RAD51AP1 enhances the ability of the DMC1 presynaptic filament to capture the duplex DNA partner and to assemble the synaptic complex, in which the recombining DNA strands are homologously aligned. We also provide evidence that functional co-operation is dependent on complex formation between DMC1 and RAD51AP1, and that distinct epitopes in RAD51AP1 mediate interactions with RAD51 and DMC1. Finally, we show that RAD51AP1 is expressed in mouse testes, and that RAD51AP1 foci co-localize with a subset of DMC1 foci in spermatocytes. These results suggest that RAD51AP1 also serves an important role in meiotic homologous recombination.","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84032718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
LBL-7825 UC-95d TID-4500-R66 TWO-WEEK LOAN COpy This is a Library Circulating Copy which may be borrowed for two weeks. For a personal retention copy, call Tech. Info. Diuision, Ext. 782 Environment Division High Performance Solar Control Office Windows William King December 1977 C'e Berkeley Prepa boratory University of California/Berkeley r t::;t:; r I the U.S. Department of Energy under Contract No. W-7405-ENG-48 '-J .Il
{"title":"High performance solar control office windows","authors":"W. J. King","doi":"10.2172/6763789","DOIUrl":"https://doi.org/10.2172/6763789","url":null,"abstract":"LBL-7825 UC-95d TID-4500-R66 TWO-WEEK LOAN COpy This is a Library Circulating Copy which may be borrowed for two weeks. For a personal retention copy, call Tech. Info. Diuision, Ext. 782 Environment Division High Performance Solar Control Office Windows William King December 1977 C'e Berkeley Prepa boratory University of California/Berkeley r t::;t:; r I the U.S. Department of Energy under Contract No. W-7405-ENG-48 '-J .Il","PeriodicalId":17982,"journal":{"name":"Lawrence Berkeley National Laboratory","volume":"136 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84032935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：