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Theoretical Electron Affinities of Pahs and Electronic Absorption Spectra Of
A&A 432, 585–594 (2005) Astronomy DOI: 10.1051/0004-6361:20042246 & c ESO 2005 Astrophysics Theoretical electron affinities of PAHs and electronic absorption spectra of their mono-anions G. Malloci1,2,G.Mulas1, G. Cappellini2,3, V. Fiorentini2,3, and I. Porceddu1 1 INAF - Osservatorio Astronomico di Cagliari – Astrochemistry Group, Strada n. 54, Loc. Poggio dei Pini, 09012 Capoterra (CA), Italy e-mail: [gmalloci;gmulas;iporcedd]@ca.astro.it 2 Dipartimento di Fisica, Università degli Studi di Cagliari, Complesso Universitario di Monserrato, S. P. Monserrato-Sestu Km 0,700, 09042 Monserrato (CA), Italy e-mail: [giancarlo.cappellini;vincenzo.fiorentini]@dsf.unica.it 3 INFM - Sardinian Laboratory for Computational Materials Science (SLACS) Received 25 October 2004 / Accepted 8 November 2004 Abstract. We present theoretical electron affinities, calculated as total energy differences, for a large sample of polycyclic aromatic hydrocarbons (PAHs), ranging in size from azulene (C10H8) to dicoronylene (C48H20). For 20 out of 22 molecules under study we obtained electron affinity values in the range 0.4–2.0 eV, showing them to be able to accept an additional electron in their LUMO π orbital. For the mono-anions we computed the absolute photo-absorption cross-sections up to the vacuum ultraviolet (VUV) using an implementation in real time and real space of the Time-Dependent Density Functional Theory (TD–DFT), an approach which has already been proven to yield accurate results for neutral and cationic PAHs. Comparison with available experimental data hints that this is the case for mono-anions as well. We find that PAH anions, like their parent molecules and the corresponding cations, display strong π∗ ← π electronic transitions in the UV. -
The Best Defense Innovations for Europe and Asia
Special analytical export project of Industrial Weekly № 09 (27) September, 2018 FIFTH SUMMIT ROSOBORONEXPORT THE BEST FROM THE BEST WORLD EXCLUSIVE Convention the Legal Russian’s only state Technology and victory from Unique system for rescue Status of the Caspian special arms exporter Military-Industrial Company from any height .20 .26 .32 .44 The best defense innovations SPECIAL PARTNERSHIP for Europe and Asia CONTENTS NEWS SHORTLY 2 ‘City of the Future‘ EDITORIAL 2 Avia Solutions Group #9 (27) September, 2018 ‘Industrial Weekly‘ special export project 4 Re-equiping of the Registered in the Federal Service for Supervision Be-200 amphibious of Communications, Information Technology aircraft and Mass Media (Roscomnadzor) 09.12.2015 4 Military Aviation Service PI № FS77-63977 Centre in India 6 For Eurasia Largest Telescope 6 Mi-35M and Mi-35P at ARMY 2018 8 NtechLab Face Recognition System 10 Run Tests in The magazine ‘Russian Aviation & Military Mountainous Areas Guide‘, published by the United industrial edition, is a winner of National prize 10 Product Range for ‘Golden Idea 2016‘ FSMTC of Russia SSJ-100 and MC-21 12 Support from the The best partnership General director Russian Foreign Ministry at ADEX-2018 Editor-in-chief Valeriy STOLNIKOV 12 Engineering Machines to It has become already obvious and undeniable Vietnam that security is becoming increasingly important Chief editor‘s deputy among the various values of civilization. Today, for Elena SOKOLOVA MAIN TOPICS any state, the ability to reliably and securely pro- 14 Vladimir Putin tect the territory, residents and values is a priority. Political situation in the world (conflicts, sanc- Commercial director and Ilham Aliyev tions, threats of war and other) makes nations Oleg DEINEKO once again reconsider their defense possibilities. -
Photo-Processing of Astro-Pahs
Photo-processing of astro-PAHs C Joblin1, G Wenzel1, S Rodriguez Castillo1,2, A Simon2,H Sabbah1,3, A Bonnamy1, D Toublanc1, G Mulas1,4, M Ji1, A Giuliani5,6, L Nahon5 1Institut de Recherche en Astrophysique et Plan´etologie(IRAP), Universit´ede Toulouse (UPS), CNRS, CNES, 9 Avenue du Colonel Roche, F-31028 Toulouse Cedex 4, France 2Laboratoire de Chimie et Physique Quantiques (LCPQ/IRSAMC), Universit´ede Toulouse and CNRS,UT3-Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse, France 3Laboratoire Collisions Agr´egatsR´eactivit´e(LCAR/IRSAMC), Universit´ede Toulouse (UPS), CNRS, 118 Route de Narbonne, F-31062 Toulouse, France 4Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius (Cagliari), Italy 5Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette Cedex, France 6INRA, UAR1008, Caract´erisationet Elaboration des Produits Issus de l'Agriculture, F-44316 Nantes, France E-mail: [email protected] Abstract. Polycyclic aromatic hydrocarbons (PAHs) are key species in astrophysical environments in which vacuum ultraviolet (VUV) photons are present, such as star-forming regions. The interaction with these VUV photons governs the physical and chemical evolution of PAHs. Models show that only large species can survive. However, the actual molecular properties of large PAHs are poorly characterized and the ones included in models are only an extrapolation of the properties of small and medium-sized species. We discuss here experiments performed on trapped ions including some at the SOLEIL VUV beam line DESIRS. We focus + on the case of the large dicoronylene cation, C48H20, and compare its behavior under VUV processing with that of smaller species. -
The Visit of Amir HH Sheikh Tamim Bin Hamad Al
BUSINESS | 15 SPORT | 19 Natural gas demand will Southgate signs new grow significantly by contract, brings in 2030: Dr Al Sada new faces Friday 5 October 2018 | 25 Moharram I 1440 www.thepeninsula.qa Volume 23 | Number 7670 | 2 Riyals Ɲ@ Qatar's Fastest Mobile Network Ɲ®ƝƝ® Amir in Argentina to strengthen strategic ties Talks between Amir H H Sheikh Tamim bin Hamad Al Thani and President Mauricio Macri are expected to focus on strengthening bilateral cooperation in several fields. THE PENINSULA DOHA: Amir H H Sheikh Tamim bin Hamad Al Thani arrived in Buenos Aires yesterday on a state visit to the Republic of Argentina. H H the Amir was wel- comed upon arrival at Ministro Pistarini (Ezeiza) International Airport by Minister of Foreign and the government and people Affairs of the Argentine of the Republic of Paraguay. Republic Jorge Faure, Qatar’s Meanwhile, the Ambas- Ambassador to Argentina Fahad sador of the Republic of bin Ibrahim Al Mana and Argentina to Qatar, Carlos Her- members of the Qatari nandez, affirmed his country’s Embassy. keenness to intensify its rela- Talks between H H the Amir tions with Qatar and to make and President Mauricio Macri them more stronger. are expected to focus on The Ambassador pointed strengthening bilateral coop- out that H H the Amir’s visit to eration in various fields, espe- Argentina, the second in two cially in the economic, trade, years, is a clear demonstration food and investment sectors, of the solid relationship QNA reported. The talks are between the two countries. also expected to cover a He said that H H the Amir’s number of issues of joint will witness the signing of an interest that are taking place on agreement on the cancellation the international arena. -
Geomicrobiological Processes in Extreme Environments: a Review
202 Articles by Hailiang Dong1, 2 and Bingsong Yu1,3 Geomicrobiological processes in extreme environments: A review 1 Geomicrobiology Laboratory, China University of Geosciences, Beijing, 100083, China. 2 Department of Geology, Miami University, Oxford, OH, 45056, USA. Email: [email protected] 3 School of Earth Sciences, China University of Geosciences, Beijing, 100083, China. The last decade has seen an extraordinary growth of and Mancinelli, 2001). These unique conditions have selected Geomicrobiology. Microorganisms have been studied in unique microorganisms and novel metabolic functions. Readers are directed to recent review papers (Kieft and Phelps, 1997; Pedersen, numerous extreme environments on Earth, ranging from 1997; Krumholz, 2000; Pedersen, 2000; Rothschild and crystalline rocks from the deep subsurface, ancient Mancinelli, 2001; Amend and Teske, 2005; Fredrickson and Balk- sedimentary rocks and hypersaline lakes, to dry deserts will, 2006). A recent study suggests the importance of pressure in the origination of life and biomolecules (Sharma et al., 2002). In and deep-ocean hydrothermal vent systems. In light of this short review and in light of some most recent developments, this recent progress, we review several currently active we focus on two specific aspects: novel metabolic functions and research frontiers: deep continental subsurface micro- energy sources. biology, microbial ecology in saline lakes, microbial Some metabolic functions of continental subsurface formation of dolomite, geomicrobiology in dry deserts, microorganisms fossil DNA and its use in recovery of paleoenviron- Because of the unique geochemical, hydrological, and geological mental conditions, and geomicrobiology of oceans. conditions of the deep subsurface, microorganisms from these envi- Throughout this article we emphasize geomicrobiological ronments are different from surface organisms in their metabolic processes in these extreme environments. -
March 2018 Presidential Election in Russia
20.03.2018-26.03.2018 • No: 156 7 MARCH 2018 PRESIDENTIAL ELECTION IN RUSSIA During recent presidential election in Russia while influential state mass media networks number of votes in favor of Putin exceeding held on March 18, 2018, incumbent President were widely used to build a patriotic enthusi- 90%, namely, Crimea (92.15%), Tyva Vladimir Putin secured a vote of confidence by asm over the vote. It is worth noting that even (91.98%), and Sevastopol (90.19%). winning a landslide re-election victory. As a the election date was moved in advance from Putin’s nearest competitor, Communist Party result, 65-year-old Vladimir Putin will extend March 11 to March 18, the day when Russia candidate Pavel Grudinin, got 11.77% of votes, his rule as a head of Russia for another six celebrates its reunification with Crimea, which marking the worst ever result for Russia’s left- years until 2024. In fact, Putin has been presi- is widely recognized among Russian citizens wing party, while leader of the far-right Liberal dent since 2000, stepping aside for one term as as Putin’s greatest achievement. Finally, Democratic Party of Russia Vladimir prime minister in order to comply with the Putin’s annual state of the nation address to the Zhirinovsky got 5.65% of votes. The only can- Russian legislation, according to which presi- Federal Assembly held on March 1, 2018, the didate to openly and strongly criticize Putin dents in Russia can’t serve more than two con- format of which underwent a number of during the campaign, well-known media per- secutive terms. -
L115 Modeling the Unidentified Infrared Emission With
The Astrophysical Journal, 511:L115±L119, 1999 February 1 q 1999. The American Astronomical Society. All rights reserved. Printed in U.S.A. MODELING THE UNIDENTIFIED INFRARED EMISSION WITH COMBINATIONS OF POLYCYCLIC AROMATIC HYDROCARBONS L. J. Allamandola, D. M. Hudgins, and S. A. Sandford NASA Ames Research Center, MS 245-6, Moffett Field, CA 94035 Received 1998 July 13; accepted 1998 November 24; published 1999 January 18 ABSTRACT The infrared emission band spectrum associated with many different interstellar objects can be modeled successfully by using combined laboratory spectra of neutral and positively charged polycyclic aromatic hydro- carbons (PAHs). These model spectra, shown here for the ®rst time, alleviate the principal spectroscopic criticisms previously leveled at the PAH hypothesis and demonstrate that mixtures of free molecular PAHs can indeed account for the overall appearance of the widespread interstellar infrared emission spectrum. Furthermore, these models give us insight into the structures, stabilities, abundances, and ionization balance of the interstellar PAH population. These, in turn, re¯ect conditions in the emission zones and shed light on the microscopic processes involved in the carbon nucleation, growth, and evolution in circumstellar shells and the interstellar medium. Subject headings: infrared: ISM: lines and bands Ð ISM: individual (Orion Bar, IRAS 2227215435) Ð line: formation Ð line: identi®cation Ð line: pro®les Ð molecular data Ð radiation mechanisms: nonthermal 1. INTRODUCTION resemblance of the -
Coronene Encapsulation in Singlewalled Carbon Nanotubes
CHEMPHYSCHEM ARTICLES DOI: 10.1002/cphc.201301200 Coronene Encapsulation in Single-Walled Carbon Nanotubes: Stacked Columns, Peapods, and Nanoribbons Ilya V. Anoshkin,*[a] Alexandr V. Talyzin,*[b] Albert G. Nasibulin,[a, e] Arkady V. Krasheninnikov,[c] Hua Jiang,[a] Risto M. Nieminen,[d] and Esko I. Kauppinen[a] Encapsulation of coronene inside single-walled carbon nano- tions between the coronene molecules and the formation of tubes (SWNTs) was studied under various conditions. Under hydrogen-terminated graphene nanoribbons. It was also ob- high vacuum, two main types of molecular encapsulation were served that the morphology of the encapsulated products observed by using transmission electron microscopy: coronene depend on the diameter of the SWNTs. The experimental re- dimers and molecular stacking columns perpendicular or tilted sults are explained by using density functional theory calcula- (45–608) with regard to the axis of the SWNTs. A relatively tions through the energies of the coronene molecules inside small number of short nanoribbons or polymerized coronene the SWNTs, which depend on the orientation of the molecules molecular chains were observed. However, experiments per- and the diameter of the tubes. formed under an argon atmosphere (0.17 MPa) revealed reac- 1. Introduction Graphene nanoribbons (GNRs) are of great interest for various in SWNTs by using thermally induced fusion of the molecular applications due to their unique electronic properties.[1–7] GNRs precursors: coronene and perylene.[17] The nanoribbons exhib- -
Human Spaceflight in Social Media: Promoting Space Exploration Through Twitter
Human Spaceflight in Social Media: Promoting Space Exploration Through Twitter Pierre J. Bertrand,1 Savannah L. Niles,2 and Dava J. Newman1,3 turn back now would be to deny our history, our capabilities,’’ said James Michener.1 The aerospace industry has successfully 1 Man-Vehicle Laboratory, Department of Aeronautics and Astro- commercialized Earth applications for space technologies, but nautics; 2Media Lab, Department of Media Arts and Sciences; and 3 human space exploration seems to lack support from both fi- Department of Engineering Systems, Massachusetts Institute of nancial and human public interest perspectives. Space agencies Technology, Cambridge, Massachusetts. no longer enjoy the political support and public enthusiasm that historically drove the human spaceflight programs. If one uses ABSTRACT constant year dollars, the $16B National Aeronautics and While space-based technologies for Earth applications are flourish- Space Administration (NASA) budget dedicated for human ing, space exploration activities suffer from a lack of public aware- spaceflight in the Apollo era has fallen to $7.9B in 2014, of ness as well as decreasing budgets. However, space exploration which 41% is dedicated to operations covering the Internati- benefits are numerous and include significant science, technological onal Space Station (ISS), the Space Launch System (SLS) and development, socioeconomic benefits, education, and leadership Orion, and commercial crew programs.2 The European Space contributions. Recent robotic exploration missions have -
Bhattacharya.1999.Thermophiles.Pdf
THE PHYLOGENY OF THERMOPHILES AND HYPERTHERMOPHILES AND THE THREE DOMAINS OF LIFE The Phylogeny of Thermophiles DEBASHISH BHATTACHARYA University of Iowa Department of Biological Sciences Biology Building, Iowa City, Iowa 52242-1324 United States THOMAS FRIEDL Department of Biology, General Botany University of Kaiserslautern P.O. Box 3049, D-67653 Kaiserslautern, Germany HEIKO SCHMIDT Deutsches Krebsforschungszentrum Theoretische Bioinformatik Im Neuenheimer Feld 280 , D-69120 Heidelberg, Germany 1. Introduction The nature of the first cells and the environment in which they lived are two of the most interesting problems in evolutionary biology. All living things are descendents of these primordial cells and are divided into three fundamental lineages or domains, Archaea (formerly known as Archaebacteria), Bacteria (formerly known as Eubacteria), and the Eucarya (formerly known as Eukaryotes, Woese et al. 1990). The Archaea and Bacteria are prokaryotic domains whereas the Eucarya includes all other living things that have a nucleus (i.e., the genetic material is separated from the cytoplasm by a nuclear envelope). The observation of the three primary domains, first made on the basis of small subunit (i.e., 16S, 18S) ribosomal DNA (rDNA) sequence comparisons (Woese 1987), has created a framework with which the nature of the last common ancestor (LCA) can be addressed. In this review we present phylogenies of the prokaryotic domains to understand the origin and distribution of the thermophiles (organisms able to grow in temperatures > 45°C) and the hyperthermophiles (organisms able to grow in temperatures > 80°C). Hyperthermophiles are limited to the Archaea and Bacteria. In addition, we inspect the distribution of extremophiles within the cyanobacteria. -
Microbiota Dynamics During Host-Plant Adaptation of Whiteflies
The ISME Journal (2020) 14:847–856 https://doi.org/10.1038/s41396-019-0576-8 ARTICLE Inside out: microbiota dynamics during host-plant adaptation of whiteflies 1 1 2 1 Diego Santos-Garcia ● Natividad Mestre-Rincon ● Einat Zchori-Fein ● Shai Morin Received: 1 June 2019 / Accepted: 17 December 2019 / Published online: 2 January 2020 © The Author(s) 2020. This article is published with open access Abstract While most insect herbivores are selective feeders, a small proportion of them feed on a wide range of plants. This polyphagous habit requires overcoming a remarkable array of defenses, which often necessitates an adaptation period. Efforts for understanding the mechanisms involved mostly focus on the insect’s phenotypic plasticity. Here, we hypothesized that the adaptation process might partially rely on transient associations with bacteria. To test this, we followed in a field-like experiment, the adaptation process of Bemisia tabaci, a generalist sap feeder, to pepper (a less-suitable host), after switching from watermelon (a suitable host). Amplicon sequencing of 16S rRNA transcripts from hundreds of dissected guts revealed the presence of active “core” and “transient” bacterial communities, dominated by the phyla Proteobacteria, 1234567890();,: 1234567890();,: Actinobacteria, and Firmicutes, and increasing differences between populations grown on watermelon and pepper. Insects grown on pepper for over two generations presented a significant increase in specific genera, mainly Mycobacterium, with a predicted enrichment in degradative pathways of xenobiotics and secondary metabolites. This result correlated with a significant increase in the insect’s survival on pepper. Taken together, our findings suggest that gut-associated bacteria can provide an additional flexible metabolic “tool-box” to generalist sap feeders for facilitating a quick host switching process. -
Protection of Chemolithoautotrophic Bacteria Exposed to Simulated
Protection Of Chemolithoautotrophic Bacteria Exposed To Simulated Mars Environmental Conditions Felipe Gómez, Eva Mateo-Martí, Olga Prieto-Ballesteros, Jose Martín-Gago, Ricardo Amils To cite this version: Felipe Gómez, Eva Mateo-Martí, Olga Prieto-Ballesteros, Jose Martín-Gago, Ricardo Amils. Pro- tection Of Chemolithoautotrophic Bacteria Exposed To Simulated Mars Environmental Conditions. Icarus, Elsevier, 2010, 209 (2), pp.482. 10.1016/j.icarus.2010.05.027. hal-00676214 HAL Id: hal-00676214 https://hal.archives-ouvertes.fr/hal-00676214 Submitted on 4 Mar 2012 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. Accepted Manuscript Protection Of Chemolithoautotrophic Bacteria Exposed To Simulated Mars En‐ vironmental Conditions Felipe Gómez, Eva Mateo-Martí, Olga Prieto-Ballesteros, Jose Martín-Gago, Ricardo Amils PII: S0019-1035(10)00220-4 DOI: 10.1016/j.icarus.2010.05.027 Reference: YICAR 9450 To appear in: Icarus Received Date: 11 August 2009 Revised Date: 14 May 2010 Accepted Date: 28 May 2010 Please cite this article as: Gómez, F., Mateo-Martí, E., Prieto-Ballesteros, O., Martín-Gago, J., Amils, R., Protection Of Chemolithoautotrophic Bacteria Exposed To Simulated Mars Environmental Conditions, Icarus (2010), doi: 10.1016/j.icarus.2010.05.027 This is a PDF file of an unedited manuscript that has been accepted for publication.