Sulfide Mineralization in Pre-Silurian Rocks, Thrasher Peaks, Western Maine

Guidebook for field trips in the Rangeley Lakes - Dead River Basin region, western Maine: 62nd annual meeting October 2, 3, and 4, 1970: Trip F-

Types et trajectoires d'insertion socioprofessionnelle de jeunes diplômés: Caractéristiques et profil sociodémographique

This article discusses the results of a study conducted toward young graduates from professional high school, technical college and university during the first three years of their socio-professional integration process. The purpose is to understand different events, personal and professional, that are significant when young graduates enter to the work market. Moreover, their professional situation three years after graduation is discussed. More closely, we present four types and eleven paths of socio- professional integration, identified from interviews carried out three years after graduation. By means of these interviews, we propose an analysis of the results according to the gender and level of education of the subjects. Finally, a discussion about the insidious form of professional instability for a growing proportion of graduates, as well as a reflection about the different groups that are more vulnerable to it, is presented.Cet article aborde les résultats d'une étude menée auprès de jeunes diplômés des secteurs secondaire professionnel, collégial technique et universitaire, 1er cycle, en processus d'insertion socioprofessionnelle. Il vise à rendre compte des différents événements personnels et professionnels qui ponctuent l'entrée sur le marché du travail de ces jeunes diplômés et à faire état de leur situation professionnelle trois ans après leur sortie du système éducatif. Plus particulièrement, nous présentons d'abord quatre types et onze trajectoires d'insertion socioprofessionnelle identifiés à partir d'entretiens semi-structurés, effectués trois ans après l'obtention du diplôme. Nous proposons ensuite une analyse de ces résultats en fonction du sexe et du niveau de scolarité des sujets. Finalement, une discussion concernant les formes plus ou moins insidieuses que prend la précarité pour une proportion importante de diplômés et une réflexion sur les groupes qui y sont les plus vulnérables complètent l'article

catena-Poly[[[cis-aqua­dibromido­cobalt(II)]-μ-(pyrazine-2-carb­oxy­lic acid)-κ3 N 1,O:N 4] monohydrate]

The title compound, {[CoBr2(C5H4N2O2)(H2O)]·H2O}n, is a one-dimensional coordination polymer which crystallizes as a monohydrate. The asymmetric unit contains one CoII atom in a distorted octa­hedral geometry, forming a chain parallel to [010] with the pyrazine carb­oxy­lic acid ligands coordinating on one side in a bidentate fashion through one N and one O atom, and in a monodentate fashion through a N atom, with N atoms trans, and with both ligands lying in the same plane. The bromide atoms are cis to each other, while a water mol­ecule occupies the final octa­hedral coordination site. The chains are linked together though an O—H⋯Br hydrogen bonding network, and are further stabilized by an O—H⋯Br and O—H⋯O hydrogen-bonding framework with the solvent water mol­ecule

Date 2014-03-31

Title Interfaces the tandem protein identification algorithm in

Geographical and temporal distribution of SARS-CoV-2 clades in the WHO European Region, January to June 2020

We show the distribution of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) genetic clades over time and between countries and outline potential genomic surveillance objectives. We applied three genomic nomenclature systems to all sequence data from the World Health Organization European Region available until 10 July 2020. We highlight the importance of real-time sequencing and data dissemination in a pandemic situation, compare the nomenclatures and lay a foundation for future European genomic surveillance of SARS-CoV-2

Computational Study of the Reactions of Interstellar Molecules: CH2 Reacting with HCNO and HNCO

Association reactions among small molecules known to exist in the interstellar medium are interesting for theories on the origins of life. A screening of thousands of reactions, using machine learning estimates of energy barriers, identified the reaction of CH2 with HCNO and HNCO as particularly interesting. We report reaction mechanisms, including energies of transition states and products, computed with density functional theory and coupled cluster theory. The lowest energy pathway on the triplet ground state surface of CH2 + HNCO has a barrier of 11 kcal/mol and produces CH2(CO)NH. Singlet CH2 is 9 kcal/mol above the ground state. It can react with HCNO or HNCO without barrier giving four products: CH2NCHO, N-methyleneformamide, the thermodynamically favoured product; NHCHCHO; NHCHOCH; and (CH2OC)NH, oxiran-2-ylazanide. If triplet to singlet crossing occurs, an upper bound of roughly 10 kcal/mol is implied for the barrier to formation of these four products

Sugars in Space: A Quantum Chemical Study on the Barrierless Formation of Dihydroxyacetone in the Interstellar Medium

Among many theories on the life’s origins, regions between star systems in a galaxy is hypothesized to provide prebiotic material on Earth. Simple sugars, including glycolaldehyde, are confirmed to exist in interstellar medium (ISM) and can be intermediates in the formose reaction to form dihydroxyacetone or DHA. In the studied segment of the formose reaction, hydroxy carbene is sequentially added to formaldehyde, forming glycolaldehyde (hydroxyacetaldehyde) after the first addition and glycerone in the second. The proposed theoretical mechanism was validated through quantum chemical calculations. An exothermic and exergonic pathway favourable in ISM conditions was found, giving a possible explanation for glycerone formation. The products in question participates in biological processes like energy production, the phosphorylated form of glycerone, DHA-P, participates in glycolysis, and energy storage while glycerone is the source of the glycerine backbone in lipids. The studied reaction is a segment of the formose reaction and further polymerization can lead to pentose and hexose, which take part in the formation of RNA and DNA. Hence, this research explores the hypothesis of exogenous production and delivery of prebiotic material to Earth, building up to the conditions allowing the formation of rudimentary lifeforms.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author