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  • Articles  (40)
  • Oxford University Press  (17)
  • Copernicus  (16)
  • Wiley-Blackwell  (6)
  • Sage
  • 2015-2019  (32)
  • 1980-1984  (5)
  • 1890-1899  (3)
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  • Articles  (40)
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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 44 (1891), S. 513-535 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 286 (1895), S. 27-57 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: PE Spectra and Molecular Properties. 89. Ionisation Patterns and Conformation of Cyclo Polythianes (H2CS)nCyclopolythianes (H2CS)n (n = 3, 4, 5) show characteristic low-energy ionization patterns, which are assigned to radical cation states with predominant sulfur lone pair contributions, and the correlation of which with topological eigenvalues ∊JHMO of a perimeter model exhibit the rather low standard deviation of only 0.08 eV. This finding suggests that the sulfur lone pairs should be equivalent on time-averaging. Geometry-optimized SCF calculations concerning preferred conformations as well as molecular flexibility of cyclopolythianes (H2CS)3 and (H2CS)4 in the gaseous phase, yield low barriers for transition between tub and chair conformers and also eigenvalue-sets which correlate with the PE data.
    Notes: Cyclopolythiane (H2CS)n (n = 3, 4, 5) besitzen im niederenergetischen Bereich charakteristische Ionisationsmuster, die Radikalkation-Zuständen mit überwiegendem Schwefelelektronenpaar-Anteil zuzuordnen sind, und deren Korrelation mit den topologischen Eigenwerten ∊JHMO eines Perimeter-Modells die geringe Standardabweichung von nur 0,08 eV aufweist. Dieser Befund legt nahe, daß im zeitlichen Mittel die Schwefel-Elektronenpaare äquivalent sein sollten. Geometrieoptimierte MNDO-Rechnungen über Vorzugskonformationen und zur Molekülbeweglichkeit von Cyclopolythianen (H2CS)3 und (H2CS)4 in der Gasphase ergeben niedrige Barrieren für die Übergänge zwischen Wannen- und Sessel-Formen und zugleich Eigenwert-Schemata, welche sich mit den PE-Daten korrelieren lassen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 464 (1980), S. 209-216 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Comparision of the Hitherto Known cis-Dihydrogenchalcogenido Complexes of d8 MetalsPhosphine-coordinated d8 metal dichlorides react in different ways with hydrogen-sulfide, sodium hydrogensulfide and sodium hydrogenselenide respectively. The phosphine ligand and the YH-providing reactand cut a great figure to get the monomere products. Some reactions of the dihydrogenchalcogenido platinum(II) compounds with sodium ethanolat and elemental sulfur respectively are investigated. I.r. and 1H-n.m.r. spectra are reported.
    Notes: Phosphankomplexierte Dichloro-d8-Metallverbindungen reagieren unterschiedlich mit Schwefelwasserstoff, Natriumhydrogensulfid bzw. Natriumhydrogenselenid. Der Phosphanligand und der YH-liefernde Reaktand spielen eine wichtige Rolle bei der Bildung monomerer Verbindungen. Einige Reaktionen der Dihydrogenchalkogenido-Platin(II)-Verbindungen mit Natriumethanolat bzw. elementarem Schwefel wurden näher untersucht. IR- und 1H-NMR-Spektren sind angegeben.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 257-260 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The results of measurements of the thin film growth rate along the wall of long discharge tubes with flowing gas are presented. The dependence of the growth rate distribution along the tube wall on various parameters is discussed. The analysis of the conversion rate of the monomer to thin film material leads to important conclusions on the mechanism of glow polymer film formation.
    Notes: Durch Ausmessen der Profile der Schichtabscheidungsrate entlang der Wand durchströmter langer Entladungsrohre lassen sich deren Abhängigkeiten von den verschiedenen Parametern diskutieren. Speziell die Auswertung des Umsetzungsgrades liefert wichtige Aussagen zum Mechanismus der Glimmpolymerschichtbildung.
    Additional Material: 7 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 27 (1894), S. 2753-2762 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 7
    Publication Date: 2015-12-25
    Description: To evaluate compaction and interstitial melt expulsion during cumulate formation, a 20 m cumulate section including the UG2 and UG3 chromitites from a 264 m drill core through the Upper Critical Zone of the Bushveld Complex (South Africa) has been studied. The cumulates in the studied section are as follows: 3 m plagioclase pyroxenite to pyroxenite, pegmatoid footwall pyroxenite at the lower contact to UG2, 0·7 m UG2 chromitite, 6·8 m pyroxenite, 0·24 m UG3 chromitite, 2·0 m plagioclase-rich pyroxenite changing locally to norite, the two 5 cm leader stringers UG3a and UG3b, and 7 m total of olivine pyroxenites grading into plagioclase pyroxenites. All pyroxenites are dominated by orthopyroxene (opx) and the cumulate sequence is topped by mottled anorthosite grading into norite. Stratigraphic concentrations of major and trace elements of 52 bulk-rock samples were determined. Bulk-rock Mg-numbers are 0·79–0·81 throughout the silicate cumulate units, and 0·40–0·46 in the chromitite layers. The stratigraphic distribution of six incompatible trace elements (K, Rb, Ba, Cs, Zr and Th) has been used to determine the amount of trapped liquid ( F TL ) or paleo-porosity in the cumulate rocks. Final porosities (volume fractions), based on averages from the six trace elements, are 0·06–0·33 in the pyroxenites. In chromitite layers, trapped melt fractions of 0·12–0·36 are calculated from incompatible trace element concentrations, but bulk SiO 2 concentrations and X-ray tomography yield 0·04–0·17 higher porosities. Hence, the bulk silicate fraction in the chromitites may not necessarily correspond to the trapped liquid fraction, as poikilitic opx was crystallizing while the silicate melt still equilibrated. Using a previously derived experiment-based model for compaction time scales, gravitationally driven chemical compaction in the UG2–UG3–pyroxenite section is calculated to occur within 1–10 years. This time frame corresponds to the times necessary to cool a 20 m layer by 10–50°C, the temperature interval argued to encompass the liquidus and almost complete solidification. Compaction within a decade can in fact easily develop the paleo-porosities indirectly observed today and is probably stopped by crystallization of the interstitial liquid. Contrary to previous assertions, melt expulsion from the cumulate pile does not hinder compaction; calculated permeabilities would allow for the migration of an order of magnitude higher amount of melt than has to be expelled from the 20 m pile of cumulate. The pegmatoid zones in the chromitite footwalls enriched in incompatible trace elements are consistent with a collection of interstitial melts expelling from the underlying compacting pyroxenites. Their entrapment below the chromitite layers suggests that these act as permeability barriers. This is in part due to their finer grain size compared with the pyroxenites, but is mainly due to the crystallization of large poikilitic opx during compaction.
    Print ISSN: 0022-3530
    Electronic ISSN: 1460-2415
    Topics: Geosciences
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  • 8
    Publication Date: 2016-03-30
    Description: Coinductive definitions, such as that of an infinite stream, may often be described by elegant logic programs, but ones for which SLD-refutation is of no value as SLD-derivations fall into infinite loops. Such definitions give rise to questions of lazy corecursive derivations and parallelism, as execution of such logic programs can have both recursive and corecursive features at once. Observational and coalgebraic semantics have been used to study them abstractly. The programming developments have often occurred separately and have usually been implementation-led. Here, we give a coherent semantics-led account of the issues, starting with abstract category theoretic semantics, developing coalgebra to characterize naturally arising trees and proceeding towards implementation of a new dialect, CoALP, of logic programming, characterised by guarded lazy corecursion and parallelism.
    Print ISSN: 0955-792X
    Electronic ISSN: 1465-363X
    Topics: Computer Science , Mathematics
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  • 9
    Publication Date: 2016-08-11
    Description: : Intrinsically disordered proteins (IDPs) play central roles in many biological processes. Consequently, an accurate description of the disordered state is an important step towards a comprehensive understanding of a number of important biological functions. In this work we describe a new web server, Mollack, for the automated construction of unfolded ensembles that uses both experimental and molecular simulation data to construct models for the unfolded state. An important aspect of the method is that it calculates a quantitative estimate of the uncertainty in the constructed ensemble, thereby providing an objective measure of the quality of the final model. Overall, Mollack facilitates structure-function studies of disordered proteins. Availability and Implementation: http://cmstultz-mollack.mit.edu Contact: cmstultz@mit.edu Supplementary information: Supplementary data are available at Bioinformatics online.
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
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  • 10
    Publication Date: 2016-06-02
    Description: Candida albicans is a dimorphic yeast commonly found on human mucosal membranes that switches from yeast to hyphal morphology in response to environmental factors. The change to hyphal growth requires histone H3 modifications by the yeast-specific histone acetyltransferase Rtt109. In addition to its role in morphogenesis, Rtt109-dependent acetylation of histone H3 lysine residues 9 and 56 has regulatory functions during DNA replication and repair. Boric acid (BA) is a broad-spectrum agent that specifically inhibits C. albicans hyphal growth, locking the fungus in its harmless commensal yeast state. The present study characterizes the effect of BA on C. albicans histone acetylation in respect to specificity, time-course and significance. We demonstrate that sublethal concentrations of BA reduce H3K9/H3K56 acetylation, both on a basal level and in response to genotoxic stress. Acetylation at other selected histone sites were not affected by BA. qRT-PCR expression analysis of the DNA repair gene Rad51 indicated no elevated level of genotoxic stress during BA exposure. A forward-mutation analysis demonstrated the BA does not increase spontaneous or induced mutations . The findings suggest that DNA repair remains effective even when histone H3 acetylation decreases and dispels the notion that BA treatment impairs genome integrity in yeast.
    Keywords: Physiology & Biochemistry
    Print ISSN: 0378-1097
    Electronic ISSN: 1574-6968
    Topics: Biology
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