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Search Results: 1 - 10 of 217168 matches for " Patrick L. Djonwouo "
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A Chiral Three Dimensional Potassium(I)/Strontium(II)/Chromium(III) Oxalato-Bridged Coordination Polymer: Synthesis, Characterization and Thermal Analysis  [PDF]
Justin Nenwa, Issoufou Kaboré, Yves A. Mbiangué, Patrick L. Djonwouo, Peter T. Ndifon
Crystal Structure Theory and Applications (CSTA) , 2014, DOI: 10.4236/csta.2014.34008
Abstract: A new compound of general formula {[(H2O)2K(μ-H2O)Sr]@[Cr(C2O4)3]}n (1) has been synthesized in water and characterized by elemental and thermal analyses, EDX, IR and UV-Vis spectroscopies and by single crystal X-ray structure determination. Compound 1 crystallizes in the chiral space group Fdd2 of orthorhombic system with a = 14.110 (4) ?, b = 36.074 (11)?, c =11.034 (3)? and Z = 16. Compound 1 is a coordination polymer in which the three-dimensional lattice framework is realized by the interconnectivity between K+ cations, Sr2+ cations, aqua ligands and [Cr(C2O4)3]3 complex anions. The asymmetric unit of 1 consists of one cationic motif formally written [(H2O)2K(μ-H2O)Sr]3+ and one anionic entity, [Cr(C2O4)3]3. The K+ and Sr2+ ions in the cationic motif are both eight-coordinate while the Cr3+ ions in the anionic complex are six-coordinate in a distorted octahedral geometry. Coulombic interactions between the ionic motifs and the three-dimensional H-bonding involving aqua ligands help to consolidate the bulk structure. Thermogra-vimetric analysis (TGA) shows that compound 1 is stable to heat up to ca. 80.
Synthesis and Crystal Structure of the First Example of a Tris-Chelated Co(II) Complex Based on Oxamide Dioxime Ligand  [PDF]
Gouet Bebga, Emmanuel N. Nfor, Yves A. Mbiangué, Patrick L. Djonwouo, Justin Nenwa
Crystal Structure Theory and Applications (CSTA) , 2015, DOI: 10.4236/csta.2015.42002
Abstract: A new cobalt(II) complex, [Co(H2 oxado)3 ]C2 O4 H2 oxado·2H2 O (H2 oxado = oxamide dioxime), has been synthesized in aqueous solution and characterized by elemental analysis and single crystal X-ray structure determination. The complex crystallizes in the triclinic space group P-1, with the parameters a = 9.46(4), b = 11.84(5), c = 12. 81(5)?Å, α = 104.94(6), β = 99.29(5), γ = 106.73(5), V = 1284(9) Å3, Z = 2. The central cobalt(II) cation is pseudo-octahedrally coordinated by six imino N atoms of the neutral oxamide dioxime ligand. In the solid state, each of the following bricks, namely the cationic complexes, the oxalate dianions as well as the oxamide dioxime crystallization molecules, pile up parallel to the a axis. The bulk structure is consolidated by an extended three-dimensional network of hydrogen bridgings—that link the ionic partners, oxamide dioxime and water molecules to one another—and by coulombic interactions.
Anionic Nanochanneled Silver-Deficient Oxalatochromate(III) Complex with Hydroxonium as Counter Ion: Synthesis, Characterization and Crystal Structure  [PDF]
Clémence T. Eboga, Gouet Bebga, Yves A. Mbiangué, Emmanuel N. Nfor, Patrick L. Djonwouo, Michel M. Bélombé, Justin Nenwa
Open Journal of Inorganic Chemistry (OJIC) , 2017, DOI: 10.4236/ojic.2017.73005
Abstract: Reaction of Ba0.50[Ag2Cr(C2O4)3]·5H2O with Ag2SO4 in an aqueous solution of sulfuric acid (pH ≈ 3) yielded the silver(I)/chromium(III) oxalate salt H0.50[Ag2.50Cr(C2O4)3]·5H2O (1). Compound 1 can be best described as an anionic silver-deficient oxalatochromate(III) complex [Ag2.50Cr(C2O4)3]0.5- with nanochannels containing hydrogen-bonded water molecules and protons. Thermal analyses show significant weight losses corresponding to the elimination of water molecules of crystallization followed by the decomposition of the network.
Interventions ponctuelles en Europe
Patrick Léon
In Situ : Revue de Patrimoines , 2012, DOI: 10.4000/insitu.2065
Abstract: Concernant le patrimoine de l’industrieLa Route du patrimoine industriel du Cher a été présentée en 1999, en Hongrie et en Slovaquie, à l’occasion d’un colloque du CILAC (Comité d’information et de liaison pour l’archéologie, l’étude et la mise en valeur du patrimoine industriel) consacré à economic structures in change - industrial heritage in danger (21–27 septembre) par une communication commune avec le professeur J. Y. Andrieux : French iron industry : history and heritage, cultural and t...
The Mediating Role of Workers’ Climate and Behavioral Perceptions on Safety Management System Performance  [PDF]
Jan K. Wachter, Patrick L. Yorio
Open Journal of Safety Science and Technology (OJSST) , 2014, DOI: 10.4236/ojsst.2014.42010
Abstract: Based on survey results from over fifty groups of workers and their employees, it has been determined that worker perceptions related to safety climate, interactional justice, and task and team safety proficiency behaviors act as mediators between a system of safety management practices and reductions in recordable injuries and, to a lesser extent, lost time injuries. It appears that in those instances where workers view or believe that their management has placed a strong priority on safety, that they are being treated with dignity and respect through the system of safety management practices, that they are carrying out their own work safely, and that they are cooperating with others to work safely as a group, the system of safety management practices is more effective in producing measurable performance results. Certain human performance constructs (informational and procedural justice climates) do not appear to act as strong mediators. Thus, there appears to be some discrimination as to which human performance constructs actually act as mediators versus a situation where all worker climate and behavioral perceptions have the same or nondistinguishing effects. These results support previous conclusions that safety management practices should be designed and implemented to promote and enhance positive worker perceptions, thereby putting workers at the center of safety management systems which is a fundamental concept behind the human performance approach to safety management.
HTLV-1 p30II: selective repressor of gene expression
Patrick L Green
Retrovirology , 2004, DOI: 10.1186/1742-4690-1-40
Abstract: The complex sequence of events set in motion by human T-lymphotropic virus type 1 (HTLV-1) to cause proliferation and ultimately transformation of T lymphocytes is beginning to be unraveled. Only recently has it become clear that viral encoded proteins, the so-called "accessory" gene products of this complex retrovirus, play an integral role in the pathogenic process. In addition to the structural and enzymatic gene products, HTLV-1 encodes regulatory and accessory proteins from four open reading frames (ORF) in the pX region between env and the 3' long terminal repeat (LTR) of the provirus [1,2]. The well studied Rex and Tax positive regulators are encoded in the ORF III and IV, respectively. Rex plays a critical role in nuclear export of unspliced or singly spliced viral mRNA [3,4]. Tax orchestrates multiple interactions with cellular transcription factors and activates transcription from the viral promoter and modulates the transcription or activity of numerous cellular genes involved in cell growth and differentiation, cell cycle control, and DNA repair [5,6]. Recent studies have indicated novel roles for pX ORF I and II gene products in the replication of HTLV-1 [7-9]. Although the study of these gene products were largely by-passed by virologists until the mid 1990's, they intensified when infectious molecular clones provided the tools to better understand their role in vivo. Both HTLV-1 pX ORF I and II mRNAs have been detected in infected cell lines and blood leukocytes from HTLV-1-infected subjects including ATL and HAM/TSP patients [10,11]. Also, immune responses of HTLV-1 infected patients and asymptomatic carriers indicate that these proteins are expressed in vivo [12-14].Molecular clones of HTLV-1 with selective mutations of ORF I and II have revealed the requirement of p12I and p13II/p30II in the establishment of infection and maintenance of viral loads in a rabbit model of infection [15-17]. The nuclear and nucleolar localizing p30II has minimal homolo
Peregrinación de Luz del Día: La desilusión de Juan Bautista Alberdi
O?Connell,Patrick L.;
Acta literaria , 2004, DOI: 10.4067/S0717-68482004002900006
Abstract: in peregrinación de luz del día (1871), juan bautista alberdi (1810-1884) debaes domingo faustino sarmiento?s (1811-1888) dichotomy "civilización-barbarie" and employs irony, through the allegorical voyage of the hermaphroditic "luz del día", to critize the civilizing concept similar to sarmiento?s found in james fenimore cooper?s (1789-1851) notions of the americans (1848). in this essay, the "mitología de exclusión" used by literary critic nicolás shumway in the invention of argentina (1991) to expose argentina?s foundational fictions, the importance of alberdi?s literary contributions, and cooper and sarmiento?s contrasting political esthetic to that of alberdi, will be investigated in order to study alberdi?s dialectical vacillation between political reality and utopian imagination
The effect of random scale changes on limits of infinitesimal systems
Patrick L. Brockett
International Journal of Mathematics and Mathematical Sciences , 1978, DOI: 10.1155/s0161171278000368
Abstract: Suppose S={{Xnj, ¢ € ‰ ¢ € ‰ ¢ € ‰j=1,2, ¢ € |,kn}} is an infinitesimal system of random variables whose centered sums converge in law to a (necessarily infinitely divisible) distribution with Levy representation determined by the triple ( 3, 2,M). If {Yj, ¢ € ‰ ¢ € ‰ ¢ € ‰j=1,2, ¢ € |} are independent indentically distributed random variables independent of S, then the system S ¢ € 2={{YjXnj,j=1,2, ¢ € |,kn}} is obtained by randomizing the scale parameters in S according to the distribution of Y1. We give sufficient conditions on the distribution of Y in terms of an index of convergence of S, to insure that centered sums from S ¢ € 2 be convergent. If such sums converge to a distribution determined by ( 3 ¢ € 2,( ¢ € 2)2, ), then the exact relationship between ( 3, 2,M) and ( 3 ¢ € 2,( ¢ € 2)2, ) is established. Also investigated is when limit distributions from S and S ¢ € 2 are of the same type, and conditions insuring products of random variables belong to the domain of attraction of a stable law.
Una llamada (colectiva) por cobrar: El perpetuo exilio en Cobro revertido de José Leandro Urbina
Patrick L. O'Connell
Acta Literaria , 2001,
Peregrinación de Luz del Día: La desilusión de Juan Bautista Alberdi
Patrick L. O’Connell
Acta Literaria , 2004,
Abstract: En Peregrinación de Luz del Día (1871), Juan Bautista Alberdi (1810-1884) cuestiona la dicotomía civilización-barbarie planteada por Domingo Faustino Sarmiento (1811-1888) e ironiza, por medio del viaje alegórico de su personaje hermafrodita Luz del Día, el concepto civilizador que propone James Fenimore Cooper (1789-1851) en Notions of the Americans (1848). La "mitología de exclusión" en la Argentina manejada por el crítico literario Nicolás Shumway en The Invention of Argentina (1991) para exponer las ficciones fundacionales de la nación, la importancia de las contribuciones literarias de Alberdi y la contrastante estética política de Cooper y Sarmiento se se alarán en este ensayo por desarrollar el juego dialéctico de Alberdi entre realidad política e imaginación utópica In Peregrinación de Luz del Día (1871), Juan Bautista Alberdi (1810-1884) debaes Domingo Faustino Sarmiento’s (1811-1888) dichotomy "civilización-barbarie" and employs irony, through the allegorical voyage of the hermaphroditic "Luz del Día", to critize the civilizing concept similar to Sarmiento’s found in James Fenimore Cooper’s (1789-1851) Notions of the Americans (1848). In this essay, the "mitología de exclusión" used by literary critic Nicolás Shumway in The Invention of Argentina (1991) to expose Argentina’s foundational fictions, the importance of Alberdi’s literary contributions, and Cooper and Sarmiento’s contrasting political esthetic to that of Alberdi, will be investigated in order to study Alberdi’s dialectical vacillation between political reality and utopian imagination
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