• Improved Collagen Extraction by Modified Longin Method

      Brown, T. A.; Nelson, D. E.; Vogel, J. S.; Southon, J. R. (American Journal of Science, 1988-01-01)
      A re-evaluation of the Longin collagen-extraction method shows that a lower reflux temperature reduces degradation of protein ("collagen") remnants. This allows additional purification through ultrafiltration to isolate the >30kDalton fraction of the reflux product.
    • Small Sample 14C Dating by Liquid Scintillation Spectrometry

      Polach, Henry; Kaihola, Lauri; Robertson, Steve; Haas, Herbert (American Journal of Science, 1988-01-01)
      Small sample 14C dating is tested using conventional as well as high-resolution low-level liquid scintillation (LS) spectrometers. Contrasted are the results obtained dating -.25, 125 and 250mg of elemental carbon in standard size counting vials (3mL) and 0.3mL teflon and quartz vials. It is demonstrated that the improved performance of the 0.3mL counting vials enables just adequate resolution of 25mg and very good resolution of 100mg carbon samples both at Modern and Old age limits when the determination is made in a highresolution low-level LS spectrometer.
    • Treatment of Discrepancies in Radiocarbon Dating

      Vincent, C. H. (American Journal of Science, 1988-01-01)
      A method is given for modifying the estimated radiocarbon dates of two samples when they are known to be in the wrong order.
    • University of Lund Radiocarbon Dates XXI

      Håkansson, Sören (American Journal of Science, 1988-01-01)
    • University of Texas at Austin Radiocarbon Dates XVI

      Valastro, S.; Mott Davis, E.; Varela, Alejandra G.; Lisk, Susan V. (American Journal of Science, 1988-01-01)