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  • 1
    Book
    Book
    United Kingdom: CRC Press Inc
    Language: English
    Description: Widely employed for separating and detecting chemicals in solution, separation techniques are most often applied in tandem, subsequently referred to as hyphenated...
    Keywords: Speciation (Chemistry)
    ISBN: 084939077X
    ISBN: 9780849390777
    E-ISSN: 97814200
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  • 2
    Language: English
    In: Inorganic Chemistry, June 7, 2010, Vol.49(11), p.5079-5093
    Description: Sulfur-containing mono- or bidentate types of ligands, usually form square planar Ni((II))S(4) complexes. However, it has already been established that the bidentate L(-) dithioimidodiphosphinato ligands, [R(2)P(S)NP(S)R'(2)](-), R, and R' = aryl or alkyl, can afford both tetrahedral and square planar, NiS(4)-containing, homoleptic Ni(R,R')L(2) complexes, owing to an apparent structural flexibility, which has not, so far, been probed. In this work, the literature tetrahedral Ni[R(2)P(S)NP(S)R(2)](2) complexes, R = Ph (Ni(Ph,Ph)L(2), 1(Td)) and R = (i)Pr (Ni(iPr,iPr)L(2), 2) as well as the newly synthesized Ni[(i)Pr(2)P(S)NP(S)Ph(2)](2) complex (Ni(iPr,Ph)L(2), 3), have been studied by UV-vis, IR, and (31)P NMR spectroscopy. Complex 3 was shown by X-ray crystallography to be square planar, and magnetic studies confirmed that it is diamagnetic in the solid state. However, it becomes paramagnetic in solution, as it shows a similar UV-vis spectrum to one of the tetrahedral 1(Td) and 2 complexes. The crystal structure of the potassium salt of the asymmetric ligand, [(i)Pr(2)P(S)NP(S)Ph(2)]K, has also been determined and compared to those of the protonated (i)Pr(2)P(S)NHP(S)Ph(2) ligand and complex 3. All three, 1(Td), 2, and 3, Ni(R,R')L(2) complexes show strong paramagnetic effects in their solution (31)P NMR spectra. The magnetic properties of paramagnetic complexes 1 and 2 in the solid state were investigated on oriented crystals, and their analysis afforded remarkably small values of the spin-orbit coupling constant (lambda) and orbital reduction factor (k) parameters, implying significant delocalization of unpaired electronic density toward the ligands. The above experimental findings are combined with data from standard density functional theory and correlated multiconfiguration ab initio theoretical methods, in an effort to investigate the interplay between the square planar and tetrahedral geometries of the NiS(4) core, the mechanistic pathway for the spin-state interconversion, the degree of covalency of the Ni-S bonds, and the distribution of the spin density in this type of system. The analysis provides justification for the structural flexibility of such ligands, affording Ni(R,R')L(2) complexes with variable metallacycle conformation and NiS(4) core geometries. Of particular importance are the large zero-field splitting values estimated by both experimental and theoretical means, which have not, as yet, been verified by direct methods, such as electron paramagnetic resonance spectroscopy. The findings of our work confirm earlier observations on the feasibility of synthesizing either tetrahedral or square planar NiS(4) complexes containing the same type of ligands. They can also form the basis of investigating structure-properties relationships in other NiS(4)-containing systems.
    Keywords: Density Functional Theory -- Usage ; Nickel (Metal) -- Chemical Properties ; Nuclear Magnetic Resonance Spectroscopy -- Usage ; Organometallic Compounds -- Structure ; Organometallic Compounds -- Chemical Properties ; Phosphine -- Chemical Properties ; Spin Coupling -- Analysis ; Ultraviolet-visible Spectroscopy -- Usage
    ISSN: 0020-1669
    E-ISSN: 1520510X
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  • 3
    Language: English
    In: Journal of Magnetism and Magnetic Materials, Feb 1, 2016, Vol.399, p.32(9)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jmmm.2015.09.056 Byline: Svetlana Estemirova, Valentin Mitrofanov, Galina Kozhina, [ETH]ndrew Fetisov Abstract: Phase relationships in Nd-deficient solid solutions Nd.sub.0.95-x Ca.sub.x MnO.sub.2.93[+ or -][delta] (x=0.00, 0.05, 0.10, 0.15, 0.20) were investigated in the temperature range T=800-1100[degrees]C in air and under reduced oxygen partial pressure (at T=1000[degrees]C). Phase diagrams in the coordinates "Temperature-calcium content" and "Po2-calcium content" were constructed. The boundaries of two-phase regions on the phase diagrams were defined.The oxidation mechanism and the stability conditions for the perovskite structure were determined.The magnetic properties of single phase samples with x=0, 0.1, 0.2 have been studied as a function of temperature and magnetic field. The observed magnetic anomalies: magnetization sign reversal and spin-reorientation transitions are compatible with the coexistence of AFM and FM phases, clusters of different nature, quasi heterogeneity (presence of clusters enriched/depleted with neodymium or manganese oxide). Quadrupole centers are considered as a source of spin inversion phenomena. Author Affiliation: (a) Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences, 101 Amundsen Street, Ekaterinburg 620016, Russia (b) Ural Federal University, 19 Mira St., 620002 Ekaterinburg, Russia Article History: Received 18 June 2015; Revised 7 September 2015; Accepted 16 September 2015
    Keywords: Magnetic Anomalies – Magnetic Properties ; Magnetic Anomalies – Analysis ; Magnetization – Magnetic Properties ; Magnetization – Analysis ; Magnetic Alloys – Magnetic Properties ; Magnetic Alloys – Analysis ; Atomic Force Microscopy – Magnetic Properties ; Atomic Force Microscopy – Analysis ; Perovskite – Magnetic Properties ; Perovskite – Analysis ; Magnetic Fields – Magnetic Properties ; Magnetic Fields – Analysis ; Solid Solutions – Magnetic Properties ; Solid Solutions – Analysis ; Manganese Compounds – Magnetic Properties ; Manganese Compounds – Analysis
    ISSN: 0304-8853
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  • 4
    Book
    Book
    Routledge Ltd
    Language: English
    Description: The period of Japanese history before the advent of industrialization and modernism is of tremendous interest to historians and others fore the insights it offers...
    Keywords: Asian Studies ; History & Archaeology;
    ISBN: 0700711848
    ISBN: 9780700711840
    E-ISSN: 97811366
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  • 5
    Language: English
    Description: Thomas Jefferson and Philosophy: Essays on the Philosophical Cast of Jefferson's Writings is a collection of essays on topics that relate to philosophical aspects...
    Keywords: Philosophy, American
    ISBN: 0739180916
    ISBN: 9780739180914
    E-ISSN: 97807391
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  • 6
    Book
    Book
    United States: Jason Aronson Publishers
    Language: English
    Description: Radical Claims in Freudian Psychoanalysis: Point/Counterpoint, edited by M. Andrew Holowchak, features pro and con essays on some of the most extreme Freudian claims, including the Freudian unconscious and the Oedipus complex. Holowchak collects the writings of critical scholars in the fields of psychology and philosophy who have distinguished themselves in the area through prior publications. This edited collection comprises six parts that address the topics—the Oedipus complex, dreams and wish-fulfillment, religion as an illusion, free association, the Freudian unconscious, and Freudian psychoanalysis as a Weltanschauung—in pro/con essay format. The format of this volume allows for a close examination of contentious issues from more than one viewpoint so as to enable readers to see that there are (often wide) differences of opinion on contentious issues, thereby allowing for a broader perspective for critical engagement. Moreover, by addressing some of the most radical claims of Freud’s psychoanalysis, this collection is proof that even many radical Freudian claims are still taken very seriously by prominent scholars.
    Keywords: Psychoanalysis
    ISBN: 0765708213
    ISBN: 9780765708212
    E-ISSN: 97807657
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  • 7
    Language: English
    In: American Journal of Human Genetics, April 3, 2014, Vol.94(4), p.485(11)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.ajhg.2014.02.011 Byline: Yun Liu, Xin Li, Martin J. Aryee, Tomas J. Ekstrom, Leonid Padyukov, Lars Klareskog, Amy Vandiver, Ann Zenobia Moore, Toshiko Tanaka, Luigi Ferrucci, M. Daniele Fallin, Andrew P. Feinberg Abstract: Epigenetic marks such as DNA methylation have generated great interest in the study of human disease. However, studies of DNA methylation have not established population-epigenetics principles to guide design, efficient statistics, or interpretation. Here, we show that the clustering of correlated DNA methylation at CpGs was similar to that of linkage-disequilibrium (LD) correlation in genetic SNP variation but for much shorter distances. Some clustering of methylated CpGs appeared to be genetically driven. Further, a set of correlated methylated CpGs related to a single SNP-based LD block was not always physically contiguous -- segments of uncorrelated methylation as long as 300 kb could be interspersed in the cluster. Thus, we denoted these sets of correlated CpGs as GeMes, defined as potentially noncontiguous methylation clusters under the control of one or more methylation quantitative trait loci. This type of correlated methylation structure has implications for both biological functions of DNA methylation and for the design, analysis, and interpretation of epigenome-wide association studies. Author Affiliation: (1) Center for Epigenetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA (2) Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA (3) Department of Pathology, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02114, USA (4) Center for Molecular Medicine, Karolinska Institutet and University Hospital, Stockholm 17176, Sweden (5) Department of Clinical Neuroscience, Karolinska Institutet, Stockholm 17176, Sweden (6) Rheumatology Unit, Department of Medicine, Solna, Karolinska Institutet, Stockholm 17176, Sweden (7) Intramural Research Program, National Institute on Aging, National Institutes of Health, Baltimore, MD 21224, USA (8) Deparment of Mental Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA Article History: Received 10 November 2013; Accepted 14 February 2014 Article Note: (miscellaneous) Published: March 20, 2014
    Keywords: Epigenetic Inheritance – Health Aspects ; Medical Genetics – Research ; Methylation – Health Aspects ; DNA – Health Aspects ; Diseases – Genetic Aspects ; Diseases – United States
    ISSN: 0002-9297
    E-ISSN: 15376605
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  • 8
    Book
    Book
    United Kingdom: Cambridge University Press
    Language: English
    Description: Recent advances in molecular genetics and genomics have been embraced by many in natural resource conservation. Today, several major conservation and management journals...
    Keywords: Biodiversity conservation
    ISBN: 0521515645
    ISBN: 0521731348
    ISBN: 9780521515641
    ISBN: 9780521731348
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  • 9
    Language: English
    Description: At the coast all is not what it seems. Decades of beachfront development have seen a variety of efforts to stabilize the shoreline to protect ill-placed beachfront...
    Keywords: Shore protection
    ISBN: 9400741227
    ISBN: 9789400741225
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  • 10
    Book
    Book
    United Kingdom: Clinical Publishing
    Language: English
    Description: With challenging infectious diseases facing all doctors, this latest case study guide will prove to be an invaluable resource. Fifty clinical cases are authored by...
    Keywords: Infection
    ISBN: 1904392830
    ISBN: 9781904392835
    E-ISSN: 97818469
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