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Search Results: 1 - 10 of 401703 matches for " M. Koga "
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Brazilian nonprofit organizations and the new legal framework: an institutional perspective
Alves, Mário Aquino;Koga, Natália Massaco;
BAR. Brazilian Administration Review , 2006, DOI: 10.1590/S1807-76922006000200006
Abstract: the purpose of this study is to understand the impact of the new brazilian legislation regulating partnerships between the state and civil society (nonprofit) organizations between 1999 and 2002. the passing of law no. 9790/99 - known as the nonprofit law - created the legal concept of organiza??es da sociedade civil de interesse público - oscips (public interest civil society organizations). based on an exploratory survey, this study, using the institutional theory, allowed the analysis of how older organizations (ngos and traditional social benefit organizations) resisted to the adoption of the oscip standard due to organizational inertia, while acceptance of the model was greater among younger organizations, in a clear coercive and normative isomorphic development.
Brazilian nonprofit organizations and the new legal framework: an institutional perspective
Alves, Mário Aquino;Koga, Natália Massaco;
Revista de Administra??o Contemporanea , 2006, DOI: 10.1590/S1415-65552006000500011
Abstract: the purpose of this study is to understand the impact of the new brazilian legislation regulating partnerships between the state and civil society (nonprofit) organizations between 1999 and 2002. the passing of law no. 9790/99 - known as the nonprofit law - created the legal concept of organiza??es da sociedade civil de interesse público - oscips (public interest civil society organizations). based on an exploratory survey, this study, using the institutional theory, allowed the analysis of how older organizations (ngos and traditional social benefit organizations) resisted to the adoption of the oscip standard due to organizational inertia, while acceptance of the model was greater among younger organizations, in a clear coercive and normative isomorphic development.
Brazilian Nonprofit Organizations and the New Legal Framework: an Institutional Perspective
Mário Aquino Alves,Natália Massaco Koga
BAR. Brazilian Administration Review , 2006,
Abstract: The purpose of this study is to understand the impact of the new Brazilian legislation regulating partnerships between the State and Civil Society (Nonprofit) Organizations between 1999 and 2002. The passing of Law No. 9790/99 – known as the Nonprofit Law – created the legal concept of Organiza es da Sociedade Civil de Interesse Público – OSCIPs (Public Interest Civil Society Organizations). Based on an exploratory survey, this study, using the Institutional Theory, allowed the analysis of how older organizations (NGOs and traditional social benefit organizations) resisted to the adoption of the OSCIP standard due to organizational inertia, while acceptance of the model was greater among younger organizations, in a clear coercive and normative isomorphic development.
Superconductivty without inversion symmetry: MnSi versus CePt_3Si
P. Frigeri,D. F. Agterberg,A. Koga,M. Sigrist
Physics , 2003, DOI: 10.1103/PhysRevLett.92.097001
Abstract: Superconductivity in materials without spatial inversion symmetry is studied. We show that in contrast to common believe, spin-triplet pairing is not entirely excluded in such systems. Moreover, paramagnetic limiting is analyzed for both spin-singlet and triplet pairing. The lack of inversion symmetry reduces the effect of the paramagnetic limiting for spin-singlet pairing. These results are applied to MnSi and CePt_3Si.
Mott transitions in the multi-orbital systems
Akihisa Koga,Norio Kawakami,T. M. Rice,Manfred Sigrist
Physics , 2004, DOI: 10.1016/j.physb.2005.01.414
Abstract: We investigate the Mott transitions in the two-orbital Hubbard model with different bandwidths. By combining dynamical mean field theory with the exact diagonalization, we discuss the stability of itinerant quasi-particle states in each band. We demonstrate that separate Mott transitions occur at different Coulomb interaction strengths in general, which merge to a single transition only under special conditions. In particular, it is clarified that the $xy$ and pair-hopping components of the Hund coupling play a key role to control the nature of the Mott transitions.
Orbital-selective Mott transitions in the degenerate Hubbard model
Akihisa Koga,Norio Kawakami,T. M. Rice,Manfred Sigrist
Physics , 2004, DOI: 10.1103/PhysRevLett.92.216402
Abstract: We investigate the Mott transitions in two-band Hubbard models with different bandwidths. Applying dynamical mean field theory, we discuss the stability of itinerant quasi-particle states in each band. We demonstrate that separate Mott transitions occur at different Coulomb interaction strengths in general, which merge to a single transition only under special conditions. This kind of behavior may be relevant for the physics of the single-layer ruthenates, Ca$_{2-x}$Sr$_x$RuO$_4$.
Spin, charge and orbital fluctuations in a multi-orbital Mott insulator
Akihisa Koga,Norio Kawakami,T. M. Rice,Manfred Sigrist
Physics , 2005, DOI: 10.1103/PhysRevB.72.045128
Abstract: The two-orbital degenerate Hubbard model with distinct hopping integrals is studied by combining dynamical mean-field theory with quantum Monte Carlo simulations. The role of orbital fluctuations for the nature of the Mott transition is elucidated by examining the temperature dependence of spin, charge and orbital susceptibilities as well as the one-particle spectral function. We also consider the effect of the hybridization between the two orbitals, which is important particularly close to the Mott transition points. The introduction of the hybridization induces orbital fluctuations, resulting in the formation of a Kondo-like heavy-fermion behavior, similarly to $f$ electron systems, but involving electrons in bands of comparable width.
Thermal Adaptation of the Archaeal and Bacterial Lipid Membranes
Yosuke Koga
Archaea , 2012, DOI: 10.1155/2012/789652
Abstract: The physiological characteristics that distinguish archaeal and bacterial lipids, as well as those that define thermophilic lipids, are discussed from three points of view that (1) the role of the chemical stability of lipids in the heat tolerance of thermophilic organisms: (2) the relevance of the increase in the proportion of certain lipids as the growth temperature increases: (3) the lipid bilayer membrane properties that enable membranes to function at high temperatures. It is concluded that no single, chemically stable lipid by itself was responsible for the adaptation of surviving at high temperatures. Lipid membranes that function effectively require the two properties of a high permeability barrier and a liquid crystalline state. Archaeal membranes realize these two properties throughout the whole biological temperature range by means of their isoprenoid chains. Bacterial membranes meet these requirements only at or just above the phase-transition temperature, and therefore their fatty acid composition must be elaborately regulated. A recent hypothesis sketched a scenario of the evolution of lipids in which the “lipid divide” emerged concomitantly with the differentiation of archaea and bacteria. The two modes of thermal adaptation were established concurrently with the “lipid divide.”
Dilséa A. Bonetti: uma especial presen a entre nós Dilséa A. Bonetti: a special presence among us
Dirce Koga
Servi?o Social & Sociedade , 2011, DOI: 10.1590/s0101-66282011000300011
Abstract:
Thermal Adaptation of the Archaeal and Bacterial Lipid Membranes
Yosuke Koga
Archaea , 2012, DOI: 10.1155/2012/789652
Abstract: The physiological characteristics that distinguish archaeal and bacterial lipids, as well as those that define thermophilic lipids, are discussed from three points of view that (1) the role of the chemical stability of lipids in the heat tolerance of thermophilic organisms: (2) the relevance of the increase in the proportion of certain lipids as the growth temperature increases: (3) the lipid bilayer membrane properties that enable membranes to function at high temperatures. It is concluded that no single, chemically stable lipid by itself was responsible for the adaptation of surviving at high temperatures. Lipid membranes that function effectively require the two properties of a high permeability barrier and a liquid crystalline state. Archaeal membranes realize these two properties throughout the whole biological temperature range by means of their isoprenoid chains. Bacterial membranes meet these requirements only at or just above the phase-transition temperature, and therefore their fatty acid composition must be elaborately regulated. A recent hypothesis sketched a scenario of the evolution of lipids in which the “lipid divide” emerged concomitantly with the differentiation of archaea and bacteria. The two modes of thermal adaptation were established concurrently with the “lipid divide.” 1. Introduction The unique structural characteristics of the archaeal polar lipids, that is, the sn-glycerol-1-phosphate (G-1-P) backbone, ether linkages, and isoprenoid hydrocarbon chains, are in striking contrast to the bacterial characteristics of the sn-glycerol-3-phosphate (G-3-P) backbone, ester linkages, and fatty acid chains. This contrast in membrane lipid structures between archaea and bacteria has been termed the “lipid divide” [1]. Because this has been repeatedly discussed [2–4], it is not discussed again here. The only thing that needs to be pointed out is that the enantiomeric difference of the lipid backbone (G-1-P and G-3-P), which is the most important feature from the evolutionary point of view, is insignificant in terms of the thermal adaptation of the membrane, because enantiomers have equivalent thermal properties. The chemical properties and physiological roles of archaeal lipids are often discussed in terms of the presence of the chemically stable ether bonds in thermophilic archaea. However, based on the archaeal lipids analyzed thus far, as shown by lipid component parts analysis [5], the mesophilic archaea possess essentially the same core lipid composition as that of the thermophilic archaea. The ether bonds therefore do not seem to be
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