Van Pelt Robert

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Van Pelt
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Robert
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  • Article
    MIxS-BE : a MIxS extension defining a minimum information standard for sequence data from the built environment
    (Nature Publishing Group, 2013-10-24) Glass, Elizabeth M. ; Dribinsky, Yekaterina ; Yilmaz, Pelin ; Levin, Hal ; Van Pelt, Robert ; Wendel, Doug ; Wilke, Andreas ; Eisen, Jonathan A. ; Huse, Susan M. ; Shipanova, Anna ; Sogin, Mitchell L. ; Stajich, Jason ; Knight, Rob ; Meyer, Folker ; Schriml, Lynn M.
    The need for metadata standards for microbe sampling in the built environment.
  • Article
    Fire history of a giant African baobab evinced by radiocarbon dating
    (Dept. of Geosciences, University of Arizona, 2010-08) Patrut, Adrian ; Mayne, Diana H. ; von Reden, Karl F. ; Lowy, Daniel A. ; Van Pelt, Robert ; McNichol, Ann P. ; Roberts, Mark L. ; Margineanu, Dragos
    The article reports the first radiocarbon dating of a live African baobab (Adansonia digitata L.), by investigating wood samples collected from 2 inner cavities of the very large 2-stemmed Platland tree of South Africa. Some 16 segments extracted from determined positions of the samples, which correspond to a depth of up to 15–20 cm in the wood, were processed and analyzed by accelerator mass spectrometry (AMS). Calibrated ages of segments are not correlated with their positions in the stems of the tree. Dating results indicate that the segments originate from new growth layers, with a thickness of several centimeters, which cover the original old wood. Four new growth layers were dated before the reference year AD 1950 and 2 layers were dated post-AD 1950, in the post-bomb period. Formation of these layers was triggered by major damage inside the cavities. Fire episodes are the only possible explanation for such successive major wounds over large areas or over the entire area of the inner cavities of the Platland tree, able to trigger regrowth.
  • Article
    Radiocarbon dating of a very large African baobab from Limpopo, South Africa : investigation of the Sagole Big Tree
    (Studia Chemia, 2017) Patrut, Adrian ; Patrut, Roxana T. ; Van Pelt, Robert ; Lowy, Daniel A. ; Forizs, Edit ; Bodis, Jeno ; Margineanu, Dragos ; von Reden, Karl F.
    The article reports the AMS (accelerator mass spectrometry) radiocarbon dating results of Sagole Big tree, a giant African baobab from Limpopo, South Africa. Several wood samples were collected from the walls of its inner cavity and dated by radiocarbon. The age values along the cavity samples increase with the distance into the wood. This anomaly shows that the cavity is a false one. The oldest sample segment had a radiocarbon date of 781 ± 29 BP, which corresponds to a calibrated age of 740 ± 15 yr. We estimate that the oldest part of the Sagole baobab has an age of 800-900 yr. We determined that the tree has a closed ring-shaped structure, which consists of a large unit with six fused stems and of two additional leaning stems.