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  1. 1
    J. W. Ho ; Y. L. Jung ; T. Liu ; B. H. Alver ; S. Lee ; K. Ikegami ; K. A. Sohn ; A. Minoda ; M. Y. Tolstorukov ; A. Appert ; S. C. Parker ; T. Gu ; A. Kundaje ; N. C. Riddle ; E. Bishop ; T. A. Egelhofer ; S. S. Hu ; A. A. Alekseyenko ; A. Rechtsteiner ; D. Asker ; J. A. Belsky ; S. K. Bowman ; Q. B. Chen ; R. A. Chen ; D. S. Day ; Y. Dong ; A. C. Dose ; X. Duan ; C. B. Epstein ; S. Ercan ; E. A. Feingold ; F. Ferrari ; J. M. Garrigues ; N. Gehlenborg ; P. J. Good ; P. Haseley ; D. He ; M. Herrmann ; M. M. Hoffman ; T. E. Jeffers ; P. V. Kharchenko ; P. Kolasinska-Zwierz ; C. V. Kotwaliwale ; N. Kumar ; S. A. Langley ; E. N. Larschan ; I. Latorre ; M. W. Libbrecht ; X. Lin ; R. Park ; M. J. Pazin ; H. N. Pham ; A. Plachetka ; B. Qin ; Y. B. Schwartz ; N. Shoresh ; P. Stempor ; A. Vielle ; C. Wang ; C. M. Whittle ; H. Xue ; R. E. Kingston ; J. H. Kim ; B. E. Bernstein ; A. F. Dernburg ; V. Pirrotta ; M. I. Kuroda ; W. S. Noble ; T. D. Tullius ; M. Kellis ; D. M. MacAlpine ; S. Strome ; S. C. Elgin ; X. S. Liu ; J. D. Lieb ; J. Ahringer ; G. H. Karpen ; P. J. Park
    Nature Publishing Group (NPG)
    Published 2014
    Staff View
    Publication Date:
    2014-08-29
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Animals ; Caenorhabditis elegans/*cytology/*genetics ; Cell Line ; Centromere/genetics/metabolism ; Chromatin/chemistry/*genetics/*metabolism ; Chromatin Assembly and Disassembly/genetics ; DNA Replication/genetics ; Drosophila melanogaster/*cytology/*genetics ; Enhancer Elements, Genetic/genetics ; Epigenesis, Genetic ; Heterochromatin/chemistry/genetics/metabolism ; Histones/chemistry/metabolism ; Humans ; Molecular Sequence Annotation ; Nuclear Lamina/metabolism ; Nucleosomes/chemistry/genetics/metabolism ; Promoter Regions, Genetic/genetics ; Species Specificity
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    ISSN:
    1432-1130
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract A new procedure has been developed for the FT-IR determination of caffeine in roasted coffee samples. The method involves wetting the coffee samples with a 0.25 M aqueous NH3 solution, extracting the caffeine with CHCl3, and measuring absorbance at 1659 cm–1 using a baseline established between 1900 and 830 cm–1. The procedure proposed is fast, only requiring a total extraction time of 16 min for each sample, and provides a drastic reduction of the organic solvent consumed, from the 200 mL diethyl ether and 50 mL CHCl3 required for each sample by the reference chromatographic UV-spectrometric determination to only 5 mL CHCl3. The method provides a limit of detection of the order of 3 mg L–1 caffeine and a relative standard deviation of 0.4% for 3 independent analyses of a sample containing 18.6%mg/g caffeine. The accuracy of the FT-IR procedure was evaluated from recovery experiments on spiked samples providing values from 94.4 to 100.1% and from the comparison of results found for a series of commercial samples, by both FT-IR and the official reference procedure.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/s002160050063

    Articles: DFG German National Licenses