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Search Results: 1 - 10 of 32453 matches for " Elbio Antonio;Kutner "
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Platelet aggregation and lipoprotein levels in a patient with familial hypercholescholesterolemia after selective LDL-apheresis
Pares, Madalena Nunes da Silva;D'Amico, Elbio Antonio;Kutner, José Mauro;Chamone, Dalton de Alencar Fischer;Bydlowski, Sergio Paulo;
Sao Paulo Medical Journal , 1997, DOI: 10.1590/S1516-31801997000300009
Abstract: platelet aggregation was studied in a patient with familial hypercholesterolemia immediately after aphereis selective for low-density lipoprotein (ldl), a lipid-lowering procedure.this treatment reduced plasmatic levels of total and ldl-cholesterol, apo b, and triglyceride. increased platelet aggregation was reduced immediately after the apheresis in whole blood as well as in platelet-rich plasma. however, aggregation in washed platelets remained unchanged after ldl-apheresis. in conclusion, in this patient reduction of ldl-cholesterol improved platelet function in the very short term.
Trombofilia: quando suspeitar e como investigar?
D'Amico Elbio Antonio
Revista da Associa??o Médica Brasileira , 2003,
Estudo comparativo entre agrega??o plaquetária por turbidimetria e impedancia elétrica em pacientes sob terapia antiplaquetária à base de ácido acetilsalicílico
Silva, Leonardo Lorenzo da;D'Amico, Elbio Antonio;
Revista Brasileira de Hematologia e Hemoterapia , 2010, DOI: 10.1590/S1516-84842010000600010
Abstract: introduction: hyperaggregation of platelets can cause the formation of thrombi and subsequent occlusion of blood vessels leading to ischemia. this phenomenon can be responsible for ischemic cardiovascular diseases such as angina pectoris and atherosclerosis as well as other forms of ischemia such as stroke. to decrease platelet function and reduce the formation of thrombi, acetylsalicylic acid has been used for antithrombotic treatment, with several studies showing its effectiveness. therefore it is necessary to use a laboratory tool to monitor the effectiveness of treatment, which is achieved through laboratory testing of platelet aggregation. the aim of this study was to compare two different methods (impedance and turbidimetry) to test platelet aggregation in 30 adult patients of both genders taking acetylsalicylic acid. conclusion: the results show that there is a good correlation between these two methods and so both these techniques can be used in the clinical routine.
Correlated Electrons in High Temperature Superconductors
Elbio Dagotto
Physics , 1993, DOI: 10.1103/RevModPhys.66.763
Abstract: Theoretical ideas and experimental results concerning high temperature superconductors are reviewed. Special emphasis is given to calculations carried out with the help of computers applied to models of strongly correlated electrons proposed to describe the two dimensional ${\rm Cu O_2}$ planes. The review also includes results using several analytical techniques. The one and three band Hubbard models, and the ${\rm t-J}$ model are discussed, and their behavior compared against experiments when available. Among the conclusions of the review, we found that some experimentally observed unusual properties of the cuprates have a natural explanation through Hubbard-like models. In particular abnormal features like the mid-infrared band of the optical conductivity $\sigma(\omega)$, the new states observed in the gap in photoemission experiments, the behavior of the spin correlations with doping, and the presence of phase separation in the copper oxide superconductors may be explained, at least in part, by these models. Finally, the existence of superconductivity in Hubbard-like models is analyzed. Some aspects of the recently proposed ideas to describe the cuprates as having a $\dx2y2$ superconducting condensate at low temperatures are discussed. Numerical results favor this scenario over others....(continues).
Open Questions in CMR Manganites, Relevance of Clustered States, and Analogies with other Compounds
Elbio Dagotto
Physics , 2003,
Abstract: This is an informal paper that contains a list of ``things we know'' and ``things we do not know'' in manganites. It is adapted from the conclusions chapter of a recent book by the author, {\it Nanoscale Phase Separation and Colossal Magnetoresistance. The Physics of Manganites and Related Compounds}, Springer-Verlag, Berlin, November 2002. The main new result of recent manganite investigations is the discovery of tendencies toward inhomogeneous states, both in experiments and in simulations of models. The colossal magnetoresistance effect appears to be closely linked to these mixed-phase tendencies, although considerably more work is needed to fully confirm these ideas. The paper also includes information on cuprates, diluted magnetic semiconductors, relaxor ferroelectrics, cobaltites, and organic and heavy fermion superconductors. These materials potentially share some common phenomenology with the manganites, such as a temperature scale $T^*$ above the ordering temperature where anomalous behavior starts. Many of these materials also present low-temperature phase competition. The possibility of colossal-like effects in compounds that do not involve ferromagnets is briefly discussed. Overall, it is concluded that inhomogeneous ``clustered'' states should be considered a new paradigm in condensed matter physics, since their presence appears to be far more common than previously anticipated.
The Race to Beat the Cuprates
Elbio Dagotto
Physics , 2001,
Abstract: Recent results reported in Science by Schon et al. using field-effect doping to study ladders and fullerenes are here described.
Experiments on Ladders Reveal a Complex Interplay between a Spin-Gapped Normal State and Superconductivity
Elbio Dagotto
Physics , 1999, DOI: 10.1088/0034-4885/62/11/202
Abstract: In recent years, the study of ladder materials has developed into a well-established area of research within the general context of Strongly Correlated Electrons. This effort has been triggered by an unusual cross-fertilization between theory and experiments. In this paper, the main experimental results obtained in the context of ladders are reviewed from the perspective of a theorist. Emphasis is given to the many similarities between the two-dimensional high-$\rm T_c$ cuprates and the two-leg ladder compounds, including Sr$_{14-x}$Ca$_x$Cu$_{24}$O$_{41}$ (14-24-41) which has a superconducting phase at high pressure and a small hole density. Examples of these similarities include regimes of linear resistivity vs temperature in metallic ladders and a normal state with spin-gap or pseudogap characteristics. Some controversial results in this context are also discussed. It is remarked that the ladder 14-24-41 is the first superconducting copper-oxide material with a non-square-lattice layered arrangement, and certainly much can be learned from a careful analysis of this compound. A short summary of the main theoretical developments in this field is also included, as well as a brief description of the properties of non-copper-oxide ladders. Suggestions by the author on possible experiments are described in the text. Overall, it is concluded that the enormous experimental effort carried out on ladders has already unveiled quite challenging and interesting physics that adds to the rich behavior of electrons in transition-metal-oxides, and in addition contributes to the understanding of the two-dimensional cuprates. However, still considerable work needs to be carried out to fully understand the interplay between charge and spin degrees of freedom in these materials.
Complexity in Strongly Correlated Electronic Systems
Elbio Dagotto
Physics , 2005, DOI: 10.1126/science.1107559
Abstract: A wide variety of experimental results and theoretical investigations in recent years have convincingly demonstrated that several transition metal oxides and other materials, have dominant states that are not spatially homogeneous. This occurs in cases in which several physical interactions -- spin, charge, lattice, and/or orbital -- are simultaneously active. This phenomenon causes interesting effects, such as colossal magnetoresistance, and it also appears crucial to understand the high temperature superconductors. The spontaneous emergence of electronic nanometer-scale structures in transition metal oxides, and the existence of many competing states, are properties often associated with complex matter where nonlinearities dominate, such as soft materials and biological systems. This electronic complexity could have potential consequences for applications of correlated electronic materials, because not only charge (semiconducting electronic), or charge and spin (spintronics) are of relevance, but in addition the lattice and orbital degrees of freedom are active, leading to giant responses to small perturbations. Moreover, several metallic and insulating phases compete, increasing the potential for novel behavior.
The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
Elbio Dagotto
Physics , 2012, DOI: 10.1103/RevModPhys.85.849
Abstract: The iron-based superconductors that contain FeAs layers as the fundamental building block in the crystal structures have been rationalized in the past using ideas based on the Fermi Surface nesting of hole and electron pockets when in the presence of weak Hubbard $U$ interactions. This approach seemed appropriate considering the small values of the magnetic moments in the parent compounds and the clear evidence based on photoemission experiments of the required electron and hole pockets. However, recent results in the context of alkali metal iron selenides, with generic chemical composition $A_x$Fe$_{2-y}$Se$_2$ ($A$ = alkali element), have drastically challenged those previous ideas since at particular compositions $y$ the low-temperature ground states are insulating and display antiferromagnetic magnetic order with large iron magnetic moments. Moreover, angle resolved photoemission studies have revealed the absence of hole pockets at the Fermi level in these materials. The present status of this exciting area of research, with the potential to alter conceptually our understanding of the iron-based superconductors, is here reviewed, covering both experimental and theoretical investigations. Other recent related developments are also briefly reviewed, such as the study of selenide two-leg ladders and the discovery of superconductivity in a single layer of FeSe. The conceptual issues considered established for the alkali metal iron selenides, as well as the several issues that still require further work, are discussed in the text.
Algumas diatomáceas encontradas s?bre algas superiores
Kutner, Miryam B.;
Boletim do Instituto Oceanográfico , 1961, DOI: 10.1590/S0373-55241961000200001
Abstract: a list of diatoms found on the higher algae centroceras sp., collected at itanhaém, state of s?o paulo, brazil, and ectocarpus sp. and caulerpa racemosa from ubatuba, also in the state of s?o paulo, brazil, is given in this paper. only onq species licmophora abbreviate agardh is typically epiphitic. nine different species and the genus auricula, are here recorded for the first time for brazil. a new species navicula melchersi is described. the difference of the surrounding conditions, calm waters at ubatuba and breakers at itanhaém, probably accounts for the species composition of the communities from the two places.
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