219 research outputs found
Data for Thermodynamics of proton insertion across the perovskite-brownmillerite transition in La0.5Sr0.5CoO3-δ
No full textThe `protonation-of-lsco` zip includes the plots which appear in our manuscript, along with the data and scripts used to generate them. In addition to the structures, energies, and other data related to host, oxygen vacancy, and hydrogen interstitial structures of La0.5Sr0.5CoO3-δ (and SrCoO2.5), metadata (e.g., INCAR settings) related to the first-principle calculations is included in the data files. Each subfolder (`scripts`, `figures`, `dos_data`, and `data`) contains a detailed README.md file that provides additional information related to the files contained within.This repository exists to share the data and scripts used in the paper "Thermodynamics of proton insertion across the perovskite-brownmillerite transition in La0.5Sr0.5CoO3-δ" by Armand J. Lannerd, Nathan J. Szymanski, and Christopher J. Bartel. The files are contained in the folder `protonation-of-lsco` with additional detailed information presented in the `README.md` files of each subfolder (`scripts`, `figures`, `dos_data`, and `data`).This work was supported primarily by the National Science Foundation through the University of Minnesota MRSEC under Award Number DMR-2011401. This material is based upon work partially supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. 2237827. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing resources that contributed to the research results reported within this paper.Lannerd, Armand J; Szymanski, Nathan J; Bartel, Christopher J. (2026). Data for Thermodynamics of proton insertion across the perovskite-brownmillerite transition in La0.5Sr0.5CoO3-δ. Retrieved from the Data Repository for the University of Minnesota (DRUM), https://doi.org/10.13020/5etj-a120
Book review: ‘Cornea. Color Atlas & Synopsis of Clinical Ophthalmology. Wills Eye Institute’, by C.J. Rapuano. Wolters Kluwer/Lippincott Williams & Wilkins, Philadelphia 2012
No full textThis book is one in a series of seven atlases covering the ophthalmic sub-specialties: cornea, retina, glaucoma, oculoplastics, neuro-ophthalmology, uveitis and paediatrics. The author of Cornea and editor of the series is Christopher Rapuano, Attending Surgeon and Director of the Cornea Service at Wills Eye Hospital in Philadelphia, Pennsylvania, USA. In the introduction to the book, Rapuano states ‘The goal of this series is to provide an up-to-date clinical overview of the major areas of ophthalmology for students, residents and practitioners in all the healthcare professions’..
Archives Moving From Dacus Library and Will Reopen on Jan. 2
No full textResearchers, scholars, genealogists and others are expected to flock to the archives to pore over its contents, which number more than six million items. Some of the most popular draws will be the 5,000-year-old cuneiform collection, the letter from George Washington, the papers of “Lost Generation” writer Nathan Asch, the world-famous children’s book author Matt Christopher, the prolific South Carolina Women’s History collections and numerous rare books
On the making of African literatures
No full textMANUSCRIPTS AND SONGS. LETTERS AND ARCHIVAL SCRAPS. Inscriptions and book collections. Maps, machines, and crude oil. Each of the essays in this special issue looks to get a handle on an author, text, or set of texts by taking hold of something solid, tangible, sensuous. In his essay on Christopher Okigbo, Nathan Suhr-Sytsma attends to the poet’s compositional practice with an ear to his passion for music. Rachel Bower combs through editorial archives and correspondence to examine the ways in which Nigerian poetry has been made by anthologies. Asha Rogers re-reads Richard Rive’s short story ‘The Bench’ after looking into the author’s personal library..
Vanadium and chromium complexes supported by sterically demanding ligands : studies relevant to the reduction of dinitrogen to ammonia
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2006.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Vita.Includes bibliographical references.Chapter 1. Using the [HIPTN3N]3- ligand ([HIPTN3N]3- = [(HIPTNCH2CH2)3N]3-; HIPT = 3,5-(2,4,6-i-Pr3C6H2)2C6H3 = HexaIsoPropylTerphenyl), green paramagnetic [HIPTN3N]V(THF) (1) can be prepared from VCl3(THF)3. Reduction of 1 with potassium graphite in ethereal solvents yields a highly sensitive red solution identified as containing paramagnetic {[HIPTN3N]VN2}-(2) via infrared spectroscopy. 1 also reacts with ammonia to form bright green paramagnetic [HIPTN3N]V(NH3) (5), 2-methylaziridine to form red diamagnetic [HIPTN3N]V=NH (7), azidotrimethylsilane to form orange diamagnetic [HIPTN3N]V=N(SiMe3) (9), propylene oxide to form purple diamagnetic [HIPTN3N]V=O (11), elemental sulfur to form dark green diamagnetic [HIPTN3N]V=S (10), and carbon monoxide to form red-gold [HIPTN3N]V(CO) (12). X-Ray crystal structures were obtained for 1, 5, and the decomposition product [HIPTN3N]VH. 5 could be converted to 7 by oxidation/deprotonation using [FeCp2]OTf/(Me3Si)2NLi. The anionic nitride "{[HIPTN3N]V=N}-" could not be obtained through deprotonation of 7, removal of the -SiMe3 group from 9, or the reaction of 1 with azides. Addition of potassium graphite to 5 resulted in decomposition rather than the formation of 2. Under the catalytic conditions used for the [HIPTN3N]Mo system, 1 produced no ammonia, while 2 and 7 yielded 0.2 and 0.78 equivalents respectively.(cont.) Chapter 2. Four dianionic diamidoamine-donor based ligands were synthesized. Two were based on a pyridine donor arm 2-(C5H4N)CH2N(CH2CH2NHIPT)2]2- ([Pyrl]2-) and 2-(6-MeC5H3N)CH2N(CH2CH2NHIPT)2]2- ([Myrl]2-), one was based on an oxygen donor arm (3,5-Me2C6H3)OCH2CH2N(CH2CH2NHIPT)2]2- ([NNO]2-), and one was based on a sulfur donor arm [(3,5-Me2C6H3)SCH2CH2N(CH2CH2NHIPT)2]2- ([NNS]2-) where HIPT = 3,5-(2,4,6-i-Pr3C6H2)2C6H3. The reaction between H2[Pyrl] with VCl3(THF)3 yielded an unstable orange product believed to be dimeric. Using H2[Myrl] yielded a stable product that on reduction with potassium graphite generated what is believed to be a dimeric, bridging dinitrogen complex, which was not catalytically active under the conditions used for the [HIPTN3N]Mo system. The reaction between VCl3(THF)3 and H2[NNO] yielded {[NNO]VCl}2 (32), which underwent ligand decomposition upon reduction with potassium graphite (33) or attempted alkylation with di-neopentyl magnesium (34). Ligand decomposition was also observed in the reaction of H2[NNS] with VCl3(THF)3 (35). X-Ray crystal structures were obtained for 32, 33, 34, and 35.(cont.) Chapter 3. Red-black [HIPTN3N]Cr (1) can be prepared from CrCl3 ([HIPTN3N]3- = [(HIPTNCH2CH2)3N]3-, while green-black [HIPTN3N]Cr(THF) (2) can be prepared from CrCl3(THF)3 where HIPT = 3,5-(2,4,6-i-Pr3C6H2)2C6H3 = exaIsoPropylTerphenyl). Reduction of {1-2} (which means either 1 or 2) with potassium graphite in diethyl ether at room temperature yields [HIPTN3N]CrK (3) as a yellow-orange powder. There is no evidence that dinitrogen is incorporated into 1, 2, or 3. Compounds that can be prepared readily from {1-2} include red [HIPTN3N]CrCO (4), blood-red [HIPTN3N]CrNO (6), and purple [HIPTN3N]CrCl (7, upon oxidation of {1-2} with AgCl). The dichroic (purple/green) Cr(VI) nitride, [HIPTN3N]CrN (8) was prepared from Bu4NN3 and 7. X-ray studies have been carried out on 4, 6, and 7, and on two co-crystallized compounds, 7 and [HIPTN3N]CrN3 (65:35) and[HIPTN3N]CrN3 and 8 (50:50). Exposure of a degassed solution of {1-2} to an atmosphere of ammonia does not yield "[HIPTN3N]Cr(NH3)" as a stable and well-behaved species analogousto [HIPTN3N](NH3). An attempt to reduce dinitrogen under conditions described for thecatalytic reduction of dinitrogen by [HIPTN3N]Mo compounds with 8 yielded a substoichiometric amount (0.8 equiv) of ammonia, which suggests that some ammonia is formedfrom the nitride, but none is formed from dinitrogen.(cont.) Chapter 4. TRAP (P(CH2CH2NH2)3), a phosphine containing analogue to TREN (N(CH2CH2NH2)3) was synthesized from PH3, but suitable conditions for arylation of the amine arms could not be found. Using the "pre-arylated" arm BrCH2CH2N(BOC)HIPT (BOC = tert-butoxycarbonyl; HIPT = 3,5-(2,4,6-i-Pr3C6H2)2C6H3) in the reaction with PH3 resulted in the isolation of H2PCH2CH2N(BOC)HIPT, but further substitution was unsuccessful. HIPTBr could be converted to HIPTNH2 using benzophenone imine and a rac-BINAP (2,2'-bis(diphenylphosphino)-1,1'-binaphthyl) supported Pd catalyst in preparation for DCC (dicyclohexylcarbodiimide) mediated coupling to tris-(3-propylcarboxylicacid)phosphine.by Nathan Christopher Smythe.Ph.D
Critical Engagements 3.1: A Journal of Criticism and Theory, Reassessing the Graphic Novel: Special issue
No full textReassessing the graphic novel special issues. Critical Engagements is a journal affiliated to the UK Network for Modern Fiction Studies, featuring criticism and theory, author interviews, reviews, and various other contributions concerned with the literary-critical field from the 1880's
Critical Engagements 3.1: A Journal of Criticism and Theory, Reassessing the Graphic Novel: Special issue
No full textReassessing the graphic novel special issues. Critical Engagements is a journal affiliated to the UK Network for Modern Fiction Studies, featuring criticism and theory, author interviews, reviews, and various other contributions concerned with the literary-critical field from the 1880's
Raymond Aron: ‘La lutte de classes’
No full textPublished in 1964, the result of one of Aron’s four cycles of university lectures dedicated to ‘industrial society’ between 1955 and 1958, La lutte de classes is – as the author himself admitted – one of his best works from a scientific point of view. In the book, the concept of ‘class struggle’, used by Marxists as the main interpretative key of the economic and social transformations generated by industrialism, undergoes a radical critique. According to Aron, it was a political, ideological and metaphysical formula, which was not very useful from the point of view of sociological research. In order to understand the structure and the dynamics of industrial societies, it is instead more useful to reflect on the concepts of ruling class or ruling minority and the way how, within such societies, power is distributed, as well as how the relationships between social groups are structured. What Aron offers in this book is therefore an original re-elaboration of the theory of the élites
Integrating manual and automated metabolic engineering methods
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Previous issue date: 2016-04-14Embargo set by: Seth Robbins for item 93100
Lift date: 2018-07-07T20:28:14Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemMetabolic engineering—the process of altering an organism's metabolism to achieve a desired goal—presents an alternative to established chemical processes. By tapping into the enormous range of metabolic transformations carried out by microbes, we can create microbial cell factories that improve upon chemical processes efficiencies while eliminating potential waste products. One of the greatest obstacles to realizing this potential is our incomplete picture of the possibilities of metabolism, a challenge we address by developing automated tools and databases to guide our inquiries. Though these high throughput studies have greatly accelerated the timeline to go from sequencing a genome to piecing together overall metabolic functions, these accelerated results generally come at the price of higher error rates. In my thesis work, I investigated ways to mitigate this loss of precision by more deeply integrating manually curated information into automated approaches.
In the first part of my thesis, I focused on defined microbial growth media, the essential substances that comprise the raw materials of biochemical processes. The vast majority of microbes cannot currently be cultured in a laboratory, a formidable obstacle to characterizing these organisms and their metabolisms. Methods that predict new defined media could expedite culturing experiments; however, such efforts require a repository of known defined media that collects successful growth conditions. To address this need, I created MediaDB, an open access database of chemically defined microbial media from published biochemical literature. MediaDB enables studies across different media that can reveal emergent trends in known media formulations across organisms. By examining media in the database, I found that they often contain similar trace mineral and vitamin solutions, suggesting a measure of uniformity in the way that biologists have traditionally created growth media. Clustering organisms based on their media compounds, I found no connection between media similarity and organism phylogeny, though several cases demonstrated a link connecting media to specific metabolic functions.
For the second part of my thesis, I built a genome scale metabolic reconstruction for Methanococcus maripaludis, an archaeon that produces methane from CO2 and H2. M. maripaludis provided an excellent engineering target, both for modifying forward methanogenesis as well as for working to oxidize methane to methanol, a first step towards building a pathway to liquid fuel that is of interest to the Department of Energy. I reconstructed my metabolic network model by relying chiefly on manual, resulting in the first network to correctly depict hydrogenotrophic methanogenesis. My reconstruction demonstrates the importance of electron bifurcation in central metabolism, providing both a window into hydrogenotrophic methanogenesis and platform to generate metabolic engineering hypotheses. I validated my model on growth yield and gene knockout data, showing its strong ability to reproduce experimentally measured results. Using the completed network, I predicted the previously unknown gene for glycine biosynthesis, a hypothesis I am now verifying with auxotrophic growth experiments. Moreover, I generated strain designs to achieve energetically feasible conversion of methane to methanol and in doing so, further demonstrated the vital role of manual curation for these predicted engineering strategies.
For the final piece of my thesis, I explored how to leverage manual curation to improve automated metabolic reconstruction. To this end, I created a method that “morphs” a manually curated metabolic model to a draft model of a closely related organism. My method combines genes from the original manually curated model with genes from an annotation database to create a final structure that contains gene-associated reactions from both sources. I used this method to create morphed models of three methanogens from iMR540 and showed that phylogenetic similarity between the source and target organisms correlated with the similarity of their models. I also found that gene annotations from iMR540 showed very low intersection with those from the annotation database, demonstrating the volume of information added by my manual curation. The morphing method could provide a viable alternative to other automated reconstruction methods for organisms that are dissimilar from those that form the foundation of annotation databases.
Together, my work exemplifies the advantages conferred by integrating manual methods with automated tools. My studies demonstrate the importance of maximizing the information we glean from manually curated data and blending that data with automated tools that accelerate large scale studies of metabolism. Such approaches mitigate the pitfalls associated with relying solely on automated methods, ensuring the high quality and depth of data as we work to characterize the space of microbial metabolism.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-05-01The student, Matthew Richards, accepted the attached license on 2016-04-13 at 11:18.The student, Matthew Richards, submitted this Dissertation for approval on 2016-04-13 at 11:27.This Dissertation was approved for publication on 2016-04-14 at 08:32.DSpace SAF Submission Ingestion Package generated from Vireo submission #9200 on 2016-07-07 at 13:49:05Embargo set by: Seth Robbins for item 93100
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Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 93100 on 2018-07-08T09:15:27Z
Orderability of Homology Spheres Obtained by Dehn Filling
No full textIn this paper, we develop a method for constructing left-orders on the
fundamental groups of rational homology 3-spheres. We begin by constructing the
holonomy extension locus of a rational homology solid torus , which encodes
the information about peripherally hyperbolic
representations of . Plots of
the holonomy extension loci of many rational homology solid tori are shown, and
the relation to left-orderability is hinted. Using holonomy extension loci, we
study rational homology 3-spheres coming from Dehn filling on rational homology
solid tori and construct intervals of Dehn fillings with left-orderable
fundamental group.Comment: 32 pages, 20 figures. arXiv admin note: text overlap with
arXiv:1602.03793 by other author
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