oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 14 )

2018 ( 25 )

2017 ( 23 )

2016 ( 16 )

Custom range...

Search Results: 1 - 10 of 10466 matches for " Marcos;Smolka "
All listed articles are free for downloading (OA Articles)
Page 1 /10466
Display every page Item
Extraction, purification and biochemical characterization of a peroxidase from Copaifera langsdorffii leaves
Maciel, Hermelinda Penha Freire;Gouvêa, Cibele Marli Ca??o Paiva;Toyama, Marcos;Smolka, Marcus;Marangoni, Sergio;Pastore, Gláucia Maria;
Química Nova , 2007, DOI: 10.1590/S0100-40422007000500003
Abstract: the aim of this work is to obtain, purify and characterize biochemically a peroxidase from copaifera langsdorffii leaves (cop). cop was obtained by acetone precipitation followed by ion-exchange chromatography. purification yielded 3.5% of peroxidase with the purification factor of 46.86. the cop optimum ph is 6.0 and the temperature is 35 oc. cop was stable in the ph range of 4.5 to 9.3 and at temperatures below 50.0 oc. the apparent michaelis-menten constants (km) for guaiacol and h2o2 were 0.04 mm and 0.39 mm respectively. enzyme turnover was 0.075 s-1 for guaiacol and 0.28 s-1 for hydrogen peroxide. copaifera langsdorffii leaves showed to be a rich source of active peroxidase (cop) during the whole year. cop could replace hrp, the most used peroxidase, in analytical determinations and treatment of industrial effluents at low cost.
Recuperación de plusvalías para el desarrollo urbano: una comparación inter-americana
Smolka,Martim; Amborski,David;
EURE (Santiago) , 2003, DOI: 10.4067/S0250-71612003008800003
Abstract: local governments design a broad range of fiscal or regulatory policies that have been inspired by the idea that land value increment may be mobilized to the benefit of the community -that is of land value capture. this paper compares the experiences of north america (us and canada) and latin america with value capture tools and discusses the reasons why different policies have been favored and different results and degrees of success obtained in their implementation. focusing on broad categories of value capture policies, the first part of the paper compares the overall performance and/or experience of the two regions with the capturing of land value increment through conventional taxes, fees and regulatory urban policy instruments. the second part of the paper shows that the same "value capture principle" to address similar problems (to deepen land value taxation; to finance urban infrastructure; to control land use) result in different outcomes (sometimes even opposite) in different contexts, most notably those presented in north america and latin america, respectively. the paper?s concluding section provides some evaluative comments regarding the apparent lag between the intentions and outcomes of value capture policies as experienced by the two regions
A memória em quest?o: uma perspectiva histórico-cultural
Smolka, Ana Luiza Bustamante;
Educa??o & Sociedade , 2000, DOI: 10.1590/S0101-73302000000200008
Abstract: this article brings to the fore the issue of memory as social practice. it focuses on the many historically constituted ways of thinking and speaking about memory. it looks for the understanding of the collective modes of elaboration of memory, searching for signs or marks of this constitution at the level of the individual and inquiring about the discursive dimension and the status of language in this constitution.
O (im)próprio e o (im)pertinente na apropria??o das práticas sociais
Smolka, Ana Luiza Bustamante;
Cadernos CEDES , 2000, DOI: 10.1590/S0101-32622000000100003
Abstract: in the present paper we aim at bringing the issue of internalization/appropriation again into discussion, exploring possibilities and limits of such terms, departing from an analysis of the notions historically condensed and stabilized in such words, and commenting on the ways they merge in the cultural-historical perspective. we focus on some inherent contradictions which provoke theoretical difficulties and require conceptual refinement. we show how internalization/appropriation has usually implied the notions of accomplishment and adequacy in the incorporation of social practices, being inevitably positively oriented. we analyze how the (im)proper and the (im)pertinent - hence, the inappropriate - in such practices might be seen as locus of resistance, mobility and change, arguing for the need of considering appropriation as an essentially relational category.
A memória em quest o: uma perspectiva histórico-cultural
Smolka Ana Luiza Bustamante
Educa??o & Sociedade , 2000,
Abstract: Este texto tematiza a memória enquanto prática social, enfocando os muitos modos, historicamente constituídos, de pensar e de falar sobre memória. Procura compreender os modos de elabora o coletiva da memória, buscando indícios da constitui o da memória no nível individual e indagando sobre a dimens o discursiva, sobre o estatuto da linguagem nessa constitui o.
Recuperación de plusvalías para el desarrollo urbano: una comparación inter-americana
Martim Smolka,David Amborski
EURE (Santiago) , 2003,
Abstract: Los gobiernos locales desarrollan una amplia gama de políticas fiscales o regulatorias inspiradas en la idea de que el incremento en el valor de la tierra puede ser utilizado en beneficio de la comunidad, esto es, en la recuperación de plusvalías inmobiliarias. Este trabajo compara las experiencias de recuperación de plusvalías en América del Norte (Estados Unidos y Canadá) y América Latina, discutiendo las razones que han llevado a la utilización de distintas herramientas y los diferentes resultados y grados de éxito obtenidos en su implementación. En primer término, el texto identifica categorías amplias de políticas de recuperación de plusvalías y compara los resultados y/o la experiencia de las dos regiones en la recuperación de los incrementos en el valor de la tierra por medio de impuestos convencionales, contribuciones fiscales e instrumentos urbanísticos. La segunda parte del texto muestra que el mismo principio de recuperación de plusvalías utilizado para abordar problemas similares (profundizar la tributación sobre el valor de la tierra, financiar infraestructura urbana, controlar el uso del suelo) tiene resultados diferentes -e incluso contradictorios- en diversos contextos, principalmente en los de América del Norte y América Latina. La sección final contiene algunos comentarios evaluatorios relativos a la aparente brecha entre las intenciones y los resultados de las políticas de recuperación de plusvalía observadas en ambas Américas Local governments design a broad range of fiscal or regulatory policies that have been inspired by the idea that land value increment may be mobilized to the benefit of the community -that is of land value capture. This paper compares the experiences of North America (US and Canada) and Latin America with value capture tools and discusses the reasons why different policies have been favored and different results and degrees of success obtained in their implementation. Focusing on broad categories of value capture policies, the first part of the paper compares the overall performance and/or experience of the two regions with the capturing of land value increment through conventional taxes, fees and regulatory urban policy instruments. The second part of the paper shows that the same "value capture principle" to address similar problems (to deepen land value taxation; to finance urban infrastructure; to control land use) result in different outcomes (sometimes even opposite) in different contexts, most notably those presented in North America and Latin America, respectively. The paper’s concluding section provides
Apresenta o
Ana Luiza Bustamante Smolka
Cadernos CEDES , 2000, DOI: 10.1590/s0101-32622000000100001
Abstract:
O (im)próprio e o (im)pertinente na apropria o das práticas sociais
Smolka Ana Luiza Bustamante
Cadernos CEDES , 2000,
Abstract: Nosso objetivo, neste trabalho, é discutir um certo modo de conceber e elaborar teoricamente a quest o da apropria o das práticas sociais, n o estritamente ligada ao construto de internaliza o, mas relacionada principalmente ao problema da significa o. Esse deslocamento encontra-se ancorado na concep o de media o do signo no desenvolvimento humano e na tese formulada por Vygotsky de que as fun es mentais s o rela es sociais internalizadas. Argumentando pela necessidade de considerar a apropria o como uma categoria essencialmente relacional, enfocamos e problematizamos as significa es das a es humanas, considerando que todas as a es adquirem múltiplos sentidos, tornam-se práticas significativas, dependendo das posi es e dos modos de participa o dos sujeitos nas rela es.
A Minimal Propositional Type Theory
Mark Kaminski,Gert Smolka
Computer Science , 2010,
Abstract: Propositional type theory, first studied by Henkin, is the restriction of simple type theory to a single base type that is interpreted as the set of the two truth values. We show that two constants (falsity and implication) suffice for denotational and deductive completeness. Denotational completeness means that every value of the full set-theoretic type hierarchy can be described by a closed term. Deductive completeness is shown for a sequent-based proof system that extends a propositional natural deduction system with lambda conversion and Boolean replacement.
A Complete and Recursive Feature Theory
Rolf Backofen,Gert Smolka
Computer Science , 1994,
Abstract: Various feature descriptions are being employed in logic programming languages and constrained-based grammar formalisms. The common notational primitive of these descriptions are functional attributes called features. The descriptions considered in this paper are the possibly quantified first-order formulae obtained from a signature of binary and unary predicates called features and sorts, respectively. We establish a first-order theory FT by means of three axiom schemes, show its completeness, and construct three elementarily equivalent models. One of the models consists of so-called feature graphs, a data structure common in computational linguistics. The other two models consist of so-called feature trees, a record-like data structure generalizing the trees corresponding to first-order terms. Our completeness proof exhibits a terminating simplification system deciding validity and satisfiability of possibly quantified feature descriptions.
Page 1 /10466
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.