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Nanoparticles of Lanthanide and Transition Metal Oxysulfides : from Colloidal Synthesis to Structure, Surface, Optical and Magnetic Properties Clement Larquet
Nanoparticles of lanthanide and transition metal oxysulfides : from colloidal synthesis to structure, surface, optical and magnetic properties Clement Larquet To cite this version: Clement Larquet. Nanoparticles of lanthanide and transition metal oxysulfides : from colloidal synthe- sis to structure, surface, optical and magnetic properties. Material chemistry. Sorbonne Université, 2018. English. NNT : 2018SORUS432. tel-02950055 HAL Id: tel-02950055 https://tel.archives-ouvertes.fr/tel-02950055 Submitted on 27 Sep 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Sorbonne Université Ecole doctorale 397 : Physique et chimie des matériaux Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP) Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC) Nanoparticles of lanthanide and transition metal oxysulfides: from colloidal synthesis to structure, surface, optical and magnetic properties Par M. Clément Larquet Thèse de doctorat de Sorbonne Université Dirigée par Clément Sanchez et Andrea Gauzzi Présentée et soutenue publiquement le 25 septembre 2018 Devant un jury composé de : Mme. Elsje Alessandra Quadrelli Directrice de recherches - CPE Lyon Rapporteur M. Stéphane Jobic Directeur de recherches - IEMN Rapporteur Mme. Catherine Louis Directrice de recherches - SU Examinatrice Mme. Asma Tougerti Chargée de recherches – Univ. -
Dalton Transactions
Dalton Transactions View Article Online PAPER View Journal | View Issue The role of neutral Rh(PONOP)H, free NMe2H, boronium and ammonium salts in the dehydro- Cite this: Dalton Trans., 2019, 48, 14724 coupling of dimethylamine-borane using the 2 + cationic pincer [Rh(PONOP)(η -H2)] catalyst†‡ E. Anastasia K. Spearing-Ewyn,a Nicholas A. Beattie,b Annie L. Colebatch, a Antonio J. Martinez-Martinez, a Andrew Docker,a Timothy M. Boyd,a Gregg Baillie,b Rachel Reed,b Stuart A. Macgregor *b and Andrew S. Weller *a 1 F 3 The σ-amine-borane pincer complex [Rh(PONOP)(η -H3B·NMe3)][BAr 4][2, PONOP = κ -NC5H3-2,6- t 2 F (OP Bu2)2] is prepared by addition of H3B·NMe3 to the dihydrogen precursor [Rh(PONOP)(η -H2)][BAr 4], 1 F 1. In a similar way the related H3B·NMe2H complex [Rh(PONOP)(η -H3B·NMe2H)][BAr 4], 3, can be made in situ, but this undergoes dehydrocoupling to reform 1 and give the aminoborane dimer [H2BNMe2]2. Creative Commons Attribution 3.0 Unported Licence. NMR studies on this system reveal an intermediate neutral hydride forms, Rh(PONOP)H, 4, that has been prepared independently. 1 is a competent catalyst (2 mol%, ∼30 min) for the dehydrocoupling of H3B·Me2H. Kinetic, mechanistic and computational studies point to the role of NMe2H in both forming the neutral hydride, via deprotonation of a σ-amine-borane complex and formation of aminoborane, and Received 17th August 2019, closing the catalytic cycle by reprotonation of the hydride by the thus-formed dimethyl ammonium Accepted 3rd September 2019 + + [NMe2H2] . -
Southwest Retort
SOUTHWEST RETORT SIXTY-NINTH YEAR OCTOBER 2016 Published for the advancement of Chemists, Chemical Engineers and Chemistry in this area published by The Dallas-Fort Worth Section, with the cooperation of five other local sections of the American Chemical Society in the Southwest Region. Vol. 69(2) OCTOBER 2016 Editorial and Business Offices: Contact the Editor for subscription and advertisement information. Editor: Connie Hendrickson: [email protected] Copy Editor: Mike Vance, [email protected] Business Manager: Danny Dunn: [email protected] The Southwest Retort is published monthly, September through May, by the Dallas-Ft. Worth Section of the American Chemical Society, Inc., for the ACS Sections of the Southwest Region. October 2016 Southwest RETORT 1 TABLE OF CONTENTS Employment Clearing House………….......3 Fifty Years Ago……………………….….....6 ARTICLES and COLUMNS Schulz Award Winner Gale Hunt………….7 And Another Thing……………………….11 Around the Area………………………….14 Letter from the Editor….…..……….........17 SPECIAL EVENTS National Chemistry Week…………………9 NEWS SHORTS Former pesticide ingredient found in dolphins, birds and fish……………………8 Coffee-infused foam removes lead from contaminated water………………………10 Snake venom composition could be related to hormones and diet……………………..13 Detecting blood alcohol content with an electronic skin patch………………...……16 INDEX OF ADVERTISERS Huffman Laboratories……………....……..4 Contact the DFW Section Vance Editing…..…………….…….……….4 General: [email protected] UT Arlington………………………………..4 Education: [email protected] ANA-LAB……………………...….…...……5 Elections: [email protected] Facebook: DFWACS Twitter: acsdfw October 2016 Southwest RETORT 2 EMPLOYMENT CLEARING HOUSE Job applicants should send name, email, and phone, along with type of position and geographical area desired; employers may contact job applicants directly. -
Thiazoline-Specific Amidohydrolase Purah Is the Gatekeeper of Bottromycin Biosynthesis
\ Sikandar, A., Franz, L., Melse, O., Antes, I. and Koehnke, J. (2019) Thiazoline-specific amidohydrolase PurAH is the gatekeeper of bottromycin biosynthesis. Journal of the American Chemical Society, 141(25), pp. 9748-9752. (doi: 10.1021/jacs.8b12231) The material cannot be used for any other purpose without further permission of the publisher and is for private use only. There may be differences between this version and the published version. You are advised to consult the publisher’s version if you wish to cite from it. http://eprints.gla.ac.uk/224167/ Deposited on 16 November 2020 Enlighten – Research publications by members of the University of Glasgow http://eprints.gla.ac.uk The Thiazoline-Specific Amidohydrolase PurAH is the Gatekeeper of Bottromycin Biosynthesis Asfandyar Sikandar,†,‡ Laura Franz,†,‡ Okke Melse,§ Iris Antes,§ and Jesko Koehnke†,* †Workgroup Structural Biology of Biosynthetic Enzymes, Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Cen- tre for Infection Research, Saarland University, Campus Geb. E8.1, 66123 Saarbrücken, Germany §Center for Integrated Protein Science Munich at the TUM School of Life Sciences, Technische Universität München, Emil-Erlen- meyer-Forum 8, 85354 Freising, Germany Supporting Information Placeholder ABSTRACT: The ribosomally synthesized and post-transla- the a/b-hydrolase BotH, successive oxidative decarboxylation of tionally modified peptide (RiPP) bottromycin A2 possesses the thiazoline to a thiazole (BotCYP) and O-methylation of an potent antimicrobial activity. Its biosynthesis involves the en- aspartate (BotOMT) complete bottromycin biosynthesis. zymatic formation of a macroamidine, a process previously Scheme 1. (a) A gene cluster highly homologous in se- suggested to require the concerted efforts of a YcaO enzyme quence and organization to those of confirmed bottromy- (PurCD) and an amidohydrolase (PurAH) in vivo. -
Elements of a Glovebox Glove Integrity Program
RESEARCH ARTICLE Elements of a Glovebox Glove Integrity Program Programmatic operations at the Los Alamos National Laboratory Plutonium Facility involve working with various amounts of plutonium and other highly toxic, alpha-emitting materials. The spread of radiological contamination on surfaces and airborne contamination and excursions of contaminants into the operator’s breathing zone are prevented through the use of a variety of gloveboxes. The glovebox gloves are the weakest part of this engineering control. As a matter of good business practice, a team of glovebox experts from Los Alamos National Laboratory has been assembled to proactively investigate processes and procedures that minimize unplanned openings in the glovebox gloves, i.e., breaches and failures. Working together, they have developed the key elements of an efficient Glovebox Glove Integrity Program (GGIP). In the following report, the consequences of a glove failure or breach are identified, the acceptable risk is clarified, and elements needed to implement an efficient GGIP are discussed. By Michael E. Cournoyer, INTRODUCTION Through an integrated approach, Julio M. Castro, controls have been developed and Michelle B. Lee, Plutonium requires a high degree of implemented that come from input Cindy M. Lawton, confinement and continuous control from glovebox workers, scientists, Young Ho Park, measures in nuclear research labora- health physicists, statisticians, and phy- Roy Lee, tories because of its extremely low sical therapists. Working together, they Stephen Schreiber permissible body burden.1 Methods have developed an efficient Glovebox and equipment must be designed Glove Integrity Program (GGIP). toward the ultimate accomplishment Recent accomplishes of this team have 2–5 Michael E. -
Photochemical Generation of Carbenes and Ketenes from Phenanthrene-Based Precursors Part I: Dimethylalkylidene Part II: Diphenylketene
Colby College Digital Commons @ Colby Honors Theses Student Research 2017 Photochemical Generation of Carbenes and Ketenes from Phenanthrene-based Precursors Part I: Dimethylalkylidene Part II: Diphenylketene Tarini S. Hardikar Student Tarini Hardikar Colby College Follow this and additional works at: https://digitalcommons.colby.edu/honorstheses Part of the Organic Chemistry Commons Colby College theses are protected by copyright. They may be viewed or downloaded from this site for the purposes of research and scholarship. Reproduction or distribution for commercial purposes is prohibited without written permission of the author. Recommended Citation Hardikar, Tarini S. and Hardikar, Tarini, "Photochemical Generation of Carbenes and Ketenes from Phenanthrene-based Precursors Part I: Dimethylalkylidene Part II: Diphenylketene" (2017). Honors Theses. Paper 948. https://digitalcommons.colby.edu/honorstheses/948 This Honors Thesis (Open Access) is brought to you for free and open access by the Student Research at Digital Commons @ Colby. It has been accepted for inclusion in Honors Theses by an authorized administrator of Digital Commons @ Colby. Photochemical Generation of Carbenes and Ketenes from Phenanthrene-based Precursors Part I: Dimethylalkylidene Part II: Diphenylketene TARINI HARDIKAR A Thesis Presented to the Department of Chemistry, Colby College, Waterville, ME In Partial Fulfillment of the Requirements for Graduation With Honors in Chemistry SUBMITTED MAY 2017 Photochemical Generation of Carbenes and Ketenes from Phenanthrene-based Precursors Part I: Dimethylalkylidene Part II: Diphenylketene TARINI HARDIKAR Approved: (Mentor: Dasan M. Thamattoor, Professor of Chemistry) (Reader: Rebecca R. Conry, Associate Professor of Chemistry) “NOW WE KNOW” - Dasan M. Thamattoor Vitae Tarini Shekhar Hardikar was born in Vadodara, Gujarat, India in 1996. She graduated from the S.N. -
The Development of the First Catalyzed Reaction of Ketenes and Imines: Catalytic, Asymmetric Synthesis of Â-Lactams Andrew E
Published on Web 00/00/0000 The Development of the First Catalyzed Reaction of Ketenes and Imines: Catalytic, Asymmetric Synthesis of â-Lactams Andrew E. Taggi, Ahmed M. Hafez, Harald Wack, Brandon Young, Dana Ferraris, and Thomas Lectka* Contribution from the Department of Chemistry, Johns Hopkins UniVersity, 3400 North Charles Street, Baltimore, Maryland 21218 Received February 5, 2002 Abstract: We report practical methodology for the catalytic, asymmetric synthesis of â-lactams resulting from the development of a catalyzed reaction of ketenes (or their derived zwitterionic enolates) and imines. The products of these asymmetric reactions can serve as precursors to a number of enzyme inhibitors and drug candidates as well as valuable synthetic intermediates. We present a detailed study of the mechanism of the â-lactam forming reaction with proton sponge as the stoichiometric base, including kinetics and isotopic labeling studies. Stereochemical models based on molecular mechanics (MM) calculations are also presented to account for the observed stereoregular sense of induction in our reactions and to provide a guidepost for the design of other catalyst systems. Introduction this structural motif a worthwhile goal for the synthetic organic 10 The clinical relevance of â-lactams continues to expand at a chemist, thus the synthesis of these nonantibiotic â-lactams surprising rate. Although their use as antibiotics is being will be the focus of this contribution. While considerable effort compromised to some extent by bacterial resistance pressures,1 has been put into synthetic methodology to construct the basic recently â-lactams (especially nonnatural ones) have achieved â-lactam skeleton, there have been few general methods many important nonantibiotic uses. -
Dr. Duke's Phytochemical and Ethnobotanical Databases Chemicals Found in Papaver Somniferum
Dr. Duke's Phytochemical and Ethnobotanical Databases Chemicals found in Papaver somniferum Activities Count Chemical Plant Part Low PPM High PPM StdDev Refernce Citation 0 (+)-LAUDANIDINE Fruit -- 0 (+)-RETICULINE Fruit -- 0 (+)-RETICULINE Latex Exudate -- 0 (-)-ALPHA-NARCOTINE Inflorescence -- 0 (-)-NARCOTOLINE Inflorescence -- 0 (-)-SCOULERINE Latex Exudate -- 0 (-)-SCOULERINE Plant -- 0 10-HYDROXYCODEINE Latex Exudate -- 0 10-NONACOSANOL Latex Exudate Chemical Constituents of Oriental Herbs (3 diff. books) 0 13-OXOCRYPTOPINE Plant -- 0 16-HYDROXYTHEBAINE Plant -- 0 20-HYDROXY- Fruit 36.0 -- TRICOSANYLCYCLOHEXA NE 0 4-HYDROXY-BENZOIC- Pericarp -- ACID 0 4-METHYL-NONACOSANE Fruit 3.2 -- 0 5'-O- Plant -- DEMETHYLNARCOTINE 0 5-HYDROXY-3,7- Latex Exudate -- DIMETHOXYPHENANTHRE NE 0 6- Plant -- ACTEONLYDIHYDROSANG UINARINE 0 6-METHYL-CODEINE Plant Father Nature's Farmacy: The aggregate of all these three-letter citations. 0 6-METHYL-CODEINE Fruit -- 0 ACONITASE Latex Exudate -- 32 AESCULETIN Pericarp -- 3 ALANINE Seed 11780.0 12637.0 0.5273634907250652 -- Activities Count Chemical Plant Part Low PPM High PPM StdDev Refernce Citation 0 ALKALOIDS Latex Exudate 50000.0 250000.0 ANON. 1948-1976. The Wealth of India raw materials. Publications and Information Directorate, CSIR, New Delhi. 11 volumes. 5 ALLOCRYPTOPINE Plant Father Nature's Farmacy: The aggregate of all these three-letter citations. 15 ALPHA-LINOLENIC-ACID Seed 1400.0 5564.0 -0.22115561650586155 -- 2 ALPHA-NARCOTINE Plant Jeffery B. Harborne and H. Baxter, eds. 1983. Phytochemical Dictionary. A Handbook of Bioactive Compounds from Plants. Taylor & Frost, London. 791 pp. 17 APOMORPHINE Plant Father Nature's Farmacy: The aggregate of all these three-letter citations. 0 APOREINE Fruit -- 0 ARABINOSE Fruit ANON. -
Fumaria Parviflora Lam. (Fumitory): a Traditional Herbal Medicine with Modern Evidence
Asian Journal of Pharmacy and Pharmacology 2017; 3(6): 200-207 200 Review Article Fumaria parviflora Lam. (Fumitory): A traditional herbal medicine with modern evidence Suresh Kumar* 1, 2, Anil Kumar Sharma 3 , Anjoo Kamboj 4 1Lord Shiva College of Pharmacy Sirsa, Haryana, India-125055 2Research Scholar, Department of Pharmacy, IK Gujral Punjab Technical University, Jalandhar, Punjab, India-144001 3Formerly Director and Principal in CT Institute of Pharmaceutical Sciences, Jalandhar, Punjab, India-144020 4Chandigarh College of Pharmacy, Landran, Mohali, Punjab, India-140110 Received: 2 November 2017 Revised: 4 December 2017 Accepted: 5 December 2017 Abstract Fumaria parviflora is an important medicinal herb which is used in various traditional medicines to cure many diseases. The herbal extracts have been reported to possess anti-inflammatory, antispasmodic, antidiarrheal, bronchodilator, hypoglycemic, anthelmintic, laxative, antiprotozoal, dermatological diseases, enhance male fertility and antinociceptive effect. Their biological activity is primarily associated with the presence of alkaloids such as protopine, cryptopine, parfumine, berberine, oxyberberine, fumarine, protocatechuic acid and caffeic acid. Some other bioactive are fatty acids, volatile oils and sesquterpenoids and aromatic hydrocarbons in plant. The present review is therefore, an effort to give a detailed survey of the literature on its botany, phytochemistry and biological activities of Fumaria parviflora, chronologically. Keywords: Fumaria parviflora, Protopine, fumitory, -
Total Synthesis of (+)-Malbrancheamide B Utilizing a Stereoselective Domino Reaction Sequence to Establish the Bicyclo[2.2]Diazaoctane Core
W&M ScholarWorks Dissertations, Theses, and Masters Projects Theses, Dissertations, & Master Projects 2013 Total Synthesis of (+)-Malbrancheamide B Utilizing a Stereoselective Domino Reaction Sequence to Establish the Bicyclo[2.2]diazaoctane Core Stephen William Laws College of William & Mary - Arts & Sciences Follow this and additional works at: https://scholarworks.wm.edu/etd Part of the Organic Chemistry Commons Recommended Citation Laws, Stephen William, "Total Synthesis of (+)-Malbrancheamide B Utilizing a Stereoselective Domino Reaction Sequence to Establish the Bicyclo[2.2]diazaoctane Core" (2013). Dissertations, Theses, and Masters Projects. Paper 1539626719. https://dx.doi.org/doi:10.21220/s2-rk6n-w245 This Thesis is brought to you for free and open access by the Theses, Dissertations, & Master Projects at W&M ScholarWorks. It has been accepted for inclusion in Dissertations, Theses, and Masters Projects by an authorized administrator of W&M ScholarWorks. For more information, please contact [email protected]. Total synthesis of (+)-malbrancheamide B utilizing a stereoselective domino reaction sequence to establish the bicyclo[2.2.2]diazaoctane core Stephen William Laws Richmond, VA Bachelor of Science, College of William and Mary, 2011 A Thesis presented to the Graduate Faculty of the College of William and Mary in Candidacy for the Degree of Master of Science Chemistry Department The College of William and Mary August, 2013 APPROVAL PAGE This Thesis is submitted in partial fulfillment of the requirements for the degree of Master of Science Stephen William Laws Approved by thei^qmmittee, 07/2013 Committee Chair Assistant Professor Jonathan Scheerer, Chemistry The College of William and Mary ^ e S iA ^ G O K g y---- Professor Deborah Bebout, Chemistry The College of William and Mary / jProfessor Robert Hinkle, Chernrstry ' TheTho CollegePrkllono nfof \A/flliamWilliam anrland Mary Marx/ ABSTRACT The total enantioselective and formal racemic syntheses of malbrancheamide B, a bicyclo[2.2.2]diazaoctane-containing fungal metabolite are described. -
Arxiv:1802.07220V1 [Cond-Mat.Str-El] 20 Feb 2018 1
Thermoelectricity in Correlated narrow-gap semiconductors Jan M. Tomczak Institute of Solid State Physics, TU Wien, A-1040 Vienna, Austria We review many-body effects, their microscopic origin, as well as their impact onto thermoelec- tricity in correlated narrow-gap semiconductors. Members of this class|such as FeSi and FeSb2| display an unusual temperature dependence in various observables: insulating with large ther- mopowers at low temperatures, they turn bad metals at temperatures much smaller than the size of their gaps. This insulator-to-metal crossover is accompanied by spectral weight-transfers over large energies in the optical conductivity and by a gradual transition from activated to Curie-Weiss-like behaviour in the magnetic susceptibility. We show a retrospective of the understanding of these phenomena, discuss the relation to heavy-fermion Kondo insulators|such as Ce3Bi4Pt3 for which we present new results|and propose a general classification of paramagnetic insulators. From the latter FeSi emerges as an orbital-selective Kondo insulator. Focussing on intermetallics such as sili- cides, antimonides, skutterudites, and Heusler compounds we showcase successes and challenges for the realistic simulation of transport properties in the presence of electronic correlations. Further, we advert to new avenues in which electronic correlations may contribute to the improvement of thermoelectric performance. PACS numbers: 71.27.+a, 71.10.-w, 79.10.-n CONTENTS 2. A microscopic understanding: spin fluctuations and Hund's physics 35 Avant-propos 2 3. Realistic many-body calculations for Ce3Bi4Pt3. 38 I. Introduction 3 E. Kondo insulators, transition-metal A. Correlated narrow-gap semiconductors: a intermetallics and oxides: A categorization 39 brief overview 3 1. -
Microparticles Enhance the Formation of Seven Major Classes of Natural
Received: 4 March 2021 | Revised: 17 April 2021 | Accepted: 30 April 2021 DOI: 10.1002/bit.27818 ARTICLE Microparticles enhance the formation of seven major classes of natural products in native and metabolically engineered actinobacteria through accelerated morphological development Martin Kuhl1 | Christian Rückert3 | Lars Gläser1 | Selma Beganovic1 | Andriy Luzhetskyy2 | Jörn Kalinowski3 | Christoph Wittmann1 1Institute of Systems Biotechnology, Saarland University, Saarbrücken, Germany Abstract 2Department of Pharmaceutical Actinobacteria provide a rich spectrum of bioactive natural products and therefore Biotechnology, Saarland University, display an invaluable source towards commercially valuable pharmaceuticals and Saarbrücken, Germany 3Center for Biotechnology, Bielefeld agrochemicals. Here, we studied the use of inorganic talc microparticles (hydrous University, Bielefeld, Germany magnesium silicate, 3MgO·4SiO2·H2O, 10 µm) as a general supplement to enhance natural product formation in this important class of bacteria. Added to cultures of Correspondence Christoph Wittmann, Institute of Systems recombinant Streptomyces lividans, talc enhanced production of the macrocyclic Biotechnology, Saarland University, peptide antibiotic bottromycin A2 and its methylated derivative Met‐bottromycin Saarbrücken, Germany. −1 Email: [email protected] A2 up to 109 mg L , the highest titer reported so far. Hereby, the microparticles fundamentally affected metabolism. With 10 g L−1 talc, S. lividans grew to 40% Funding information