Browsing by UP Author "Boeyens, Jan Christoffel Antonie"

Browsing by UP Author "Boeyens, Jan Christoffel Antonie"

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  • All is Number 
    Boeyens, Jan Christoffel Antonie; Levendis, Demetrius C. (Springer, 2013)
    Rational numbers, which correctly describe many recognizable patterns in the physical world, are often seen to converge in the process to irrational limits or even singularities. As a common example, atomic numbers are ...
  • Calculation of atomic structure 
    Boeyens, Jan Christoffel Antonie (Springer, 2013)
    The Thomas–Fermi and Hartree–Fock calculations of non-hydrogen atomic structure rely on complicated numerical computations without a simple visualizable physical model. A new approach, based on a spherical wave structure ...
  • Chemistry by number theory 
    Boeyens, Jan Christoffel Antonie; Comba, Peter (Springer, 2013)
    Aspects of elementary number theory pertaining to the golden ratio and the golden spiral are shown to be related to and therefore of importance in the simulation of chemical phenomena. Readily derived concepts include ...
  • Chemistry in four dimensions 
    Boeyens, Jan Christoffel Antonie (Springer, 2013)
    Some chemical phenomena, awkward to rationalize, are argued to originate in the four-dimensional nature of matter in curved space-time. The problem is traced back to the separation of space and time variables in the ...
  • Commensurability in the solar system 
    Boeyens, Jan Christoffel Antonie (University of Toronto Press, 2009-12)
    The features in common between the well-known Bode–Titius law, other commensurable astronomical relation- ships, and the organization of self-similar atomic systems, are used to demonstrate that the orbital data of all ...
  • Covalent interaction 
    Boeyens, Jan Christoffel Antonie (Springer, 2013)
    Reviewed in historical context, bond order emerges as a vaguely defined concept without a clear theoretical basis. As an alternative, the spherical standingwave model of the extranuclear electronic distribution on an ...
  • Effects of ω3- and ω6-polyunsaturated fatty acids on RANKL-induced osteoclast differentiation of RAW264.7 cells : a comparative in vitro study 
    Boeyens, Jan Christoffel Antonie; Deepak, Vishwa; Chua, Wei-Hang; Kruger, Marlena C.; Joubert, Annie M.; Coetzee, Magdalena (Molecular Diversity Preservation International, 2014-07)
    Polyunsaturated fatty acids (PUFAs) have been reported to have an anabolic effect on bone in vivo, but comparative studies to identify inhibitors of osteoclast formation amongst ω3- and ω6-PUFAs are still lacking. Here we ...
  • From uterus to jar : the significance of an infant pot burial from Melora Saddle, an early nineteenth-century African farmer site on the Waterberg Plateau 
    Boeyens, Jan Christoffel Antonie; Van der Ryst, Maria M.; Coetzee, Francois P.; Steyn, Maryna; Loots, Marius (Natal Museum, 2010-12)
    The interment of infants in ceramic receptacles was a fairly widespread funerary practice in southern Africa during the Iron Age. Using the rich source of ethnographic data on child-death and mortuary practices among ...
  • In vitro effekte van aragidoonsuur en prostaglandien E2 op proliferasie, osteoklastvorming en beenresorpsie in RAW 264.7 muismakrofae 
    Laing, M.J.; Boeyens, Jan Christoffel Antonie; Coetzee, Magdalena (Suid Afrikaanse Akademie vir Wetenskap & Kuns, 2012)
    This study investigated the effects of arachidonic acid and prostaglandin E2 on osteoclast formation and bone resorption in RAW 264.7 murine pre-osteoclasts. Data obtained suggests an inhibitory effect of these compounds on ...
  • In vitro effekte van eikosapentaenoesuur en prostaglandien E3 op proliferasie, osteoklastvorming en beenresorpsie in RAW 264.7 muismakrofae 
    Kasonga, Abe E.; Boeyens, Jan Christoffel Antonie; Coetzee, Magdalena (AOSIS Open Journals, 2012)
    This study investigated the effects of eicosapentanoic acid and prostaglandin E3 on osteoclast formation and bone resorption in RAW 264.7 murine pre-osteoclasts. Data obtained suggests an inhibitory effect of these compounds ...
  • Inhibisie van osteoklastvorming en beenresorpsie deur poli-onversadigde vetsure in RAW 264.7 muismonosiete 
    Boeyens, Jan Christoffel Antonie; Chua, Wei-Hang; Kruger, Marlena C.; Joubert, Annie M.; Coetzee, Magdalena (Suid Afrikaanse Akademie vir Wetenskap & Kuns, 2012)
    This study investigated the effects of polyunsaturated fatty acids on osteoclast formation and bone resorption in RAW 264.7 murine pre-osteoclasts. Data obtained suggests an inhibitory effect of these compounds on ...
  • Molecular shape 
    Boeyens, Jan Christoffel Antonie; Comba, Peter (Springer, 2013)
    Molecular shape is recognized as an emergent property that complements the projection fromfour-dimensional space-time to tangent Euclidean space. Projection from hypercomplex algebra to real algebra necessitates the ...
  • A molecular-structure hypothesis 
    Boeyens, Jan Christoffel Antonie (MDPI Publishing, 2010-11)
    The self-similar symmetry that occurs between atomic nuclei, biological growth structures, the solar system, globular clusters and spiral galaxies suggests that a similar pattern should characterize atomic and molecular ...
  • Raman signatures of the modern pigment (Zn, Cd)S 1- xSe x and glass matrix of a red bead from Magoro Hill, an archaeological site in Limpopo Province, South Africa, recalibrate the settlement chronology 
    Prinsloo, Linda Charlotta; Boeyens, Jan Christoffel Antonie; Van der Ryst, Maria M.; Webb, Geoffrey (Elsevier, 2012)
    Two glass trade beads, one red and one yellow, retrieved from a secure archaeological context on Magoro Hill, an erstwhile Venda stronghold in South Africa’s Limpopo Province, were analyzed with Raman and photoluminescence ...
  • Redetermination of the crystal structure of calcium sulphate dihydrate, CaSO4 center dot 2H(2)O 
    Boeyens, Jan Christoffel Antonie; Ichharam, V.V.H. (De Gruyter, 2002-12)
    Please read abstract in the article.
  • The structure Lacuna 
    Boeyens, Jan Christoffel Antonie; Levendis, Demetrius C. (MDPI Publishing, 2012-07-20)
    Molecular symmetry is intimately connected with the classical concept of three-dimensional molecular structure. In a non-classical theory of wave-like interaction in four-dimensional space-time, both of these concepts and ...
  • Towards refining the classification of glass trade beads imported into Southern Africa from the 8th to the 16th century AD 
    Koleini, Farahnaz; Prinsloo, Linda Charlotta; Biemond, Wim M.; Colomban, Philippe; Ngo, Anh-Tu; Boeyens, Jan Christoffel Antonie; Van der Ryst, Maria M. (Elsevier, 2016-05)
    Tracing the origin of glass trade beads excavated at archaeological sites can contribute significantly to dating a site and reconstructing prehistoric trade routes. Wood developed a temporally sensitive bead sequence ...
  • The universe in perspective 
    Boeyens, Jan Christoffel Antonie (University of Toronto Press, 2010-06)
    Gödel’s rotating-universe solution of Einstein’s gravitational field equations is interpreted in real projective space. The compass of inertia is shown to coincide with the involuted geodesic of the closed manifold and ...
  • Wave-mechanical model for chemistry 
    Boeyens, Jan Christoffel Antonie (Springer, 2015-10)
    The strength and defects of wave mechanics as a theory of chemistry are critically examined. Without the secondary assumption of wave-particle duality, the seminal equation describes matter waves and leaves the concept ...