Universidade Positivo

About: Universidade Positivo is a education organization based out in Curitiba, Brazil. It is known for research contribution in the topics: Population & Biodiversity. The organization has 1290 authors who have published 1237 publications receiving 9335 citations. The organization is also known as: Positive University.

Os processos de desenvolvimento e desmatamento da Amazônia

Abstract: Este artigo analisa – com base na revisao da literatura existente e por meio da analise de dados secundarios, realizando uma analise historica desde a Colonizacao Portuguesa – as etapas de desenvolvimento da Regiao Amazonica e sua associacao com a pratica do desmatamento, destacando as politicas publicas que fomentaram o desenvolvimento da regiao e o atual avanco de sistemas produtivos orientados pelo estimulo economico. Demonstra-se que o desenvolvimento populacional e economico da Amazonia, citados como as principais causas do desmatamento e estimulados, em boa parte, por politicas economicas, e um processo desuniforme no tempo e no espaco, gerando o desmatamento desigual entre os estados que compoem essa regiao e dentro de cada estado.AbstractBasing on the literature review and on published dataset and following the time chronology of the events since the Portuguese colonization, this paper analyzes the stages of Amazonian region development and its impacts on deforestation, highlighting the policies addressing to foster the Amazon’s development and the current stage of economic activities. The population growth and the economic activities, pointed out as the main causes of the Amazonian deforestation and stimulated by economic policies, have been unequally developed inside the Amazonian region, generating the unequal deforestation process among the Amazonian states and inside each state.Keywords: Amazonian region. Development. Development policies. Deforestation causes

Marginal and internal fit of zirconia copings obtained using different digital scanning methods.

Abstract: The objective of this study was to evaluate the marginal and internal fit of zirconia copings obtained with different digital scanning methods. A human mandibular first molar was set in a typodont with its adjacent and antagonist teeth and prepared for an all-ceramic crown. Digital impressions were made using an intraoral scanner (3Shape). Polyvinyl siloxane impressions and Type IV gypsum models were also obtained and scanned with a benchtop laboratory scanner (3Shape D700). Ten zirconia copings were fabricated for each group using CAD-CAM technology. The marginal and internal fit of the zirconia copings was assessed by the silicone replica technique. Four sections of each replica were obtained, and each section was evaluated at four points: marginal gap (MG), axial wall (AW), axio-occlusal edge (AO) and centro-occlusal wall (CO), using an image analyzing software. The data were submitted to one-way ANOVA and Tukey's test (α = 0.05). They showed statistically significant differences for MG, AO and CO. Regarding MG, intraoral scanning showed lower gap values, whereas gypsum model scanning showed higher gap values. Regarding AO and CO, intraoral digital scanning showed lower gap values. Polyvinyl siloxane impression scanning and gypsum model scanning showed higher gap values and were statistically similar. It can be concluded that intraoral digital scanning provided a lower mean gap value, in comparison with conventional impressions and gypsum casts scanned with a standard benchtop laboratory scanner.

Soil ecotoxicology in Brazil is taking its course

Abstract: Soil ecotoxicology has been motivated by the increasing global awareness on environmental issues. Northern Hemisphere has been the main driver of this science branch; however, the number and quality of contributions from the Southern Hemisphere are increasing quickly. In this case study, Brazil is taken as an example of how soil ecotoxicology has developed over the last 30 years. It starts with a brief historical overview depicting the main events on soil ecotoxicology in the country. Following, an overview on the Brazilian legislation related to soil ecotoxicology is given, covering regulations with prospective focus, mainly on the registration of pesticides. Regulations with retrospective focus in contaminated areas are also given. Then, an outline of the actors in soil ecotoxicology and examples of prospective ecotoxicological studies performed with soil organisms and plants are given by stressor groups: pesticides, pharmaceuticals, metals, and residues. Experiences from retrospective studies, mainly looking at the assessment of industrial sites, are also covered. Emphasis is given on methodological aspects, pointing to needed actions, mainly regarding the different biotic and abiotic conditions of a tropical country. Finally, the last session discusses how soil ecotoxicology could be improved in methodological adaptations as well as legal requirements.

Thermal behavior of corn starch granules modified by acid treatment at 30 and 50°C

Abstract: Unprocessed native starches are structurally too weak and functionally too restricted for application in today's advanced food technologies. Processing is necessary to engender a range of functionality. Naturals or natives starches can be modified by using several methods physical, chemical, enzymatic or combined, according industrial purposes. In this work, native corn starch was hydrolyzed by hydrochloric acid solution and investigated by using thermoanalytical techniques (thermogravimetry - TG, differential thermal analysis - DTA and differential scanning calorimetry - DSC), as well as optical microscopy and X-ray diffractometry. After acid treatment at 30 and 50°C, a decrease of gelatinization enthalpy (ΔHgel) was verified. Optical microscopy and X-ray diffractometry allowed us to verify the granules contorn and rugosity typical of cereal starches.

Periódicos Brasileiros de Administração: Análise Bibliométrica de Impacto no Triênio 2005-2007

Abstract: This article deals with the evaluation of scientific periodicals from the field of Administration in Brazil, based on the use of the concept of the impact factor vis-a-vis their classification in the CAPES Qualis System. We seek to discuss the applicability of the impact factor as an instrument that ensures new guidelines for gauging quality. To this end, twenty-one periodicals and the Enanpad annals covering the period of 2005 to 2007 were analyzed. The periodicals were divided into three groups: ‘A’ Recent Domestic (made up of periodicals which were assigned the ‘A’ status in 2007); ‘A’ Traditional Domestic (made up of periodicals which have had the ‘A’ status for some time); and ‘B’ Domestic. The results show a significantly higher concentration of quotes and the impact factor for the group designated as ‘A’ Traditional Domestic. We did not find any significant difference concerning the impact factor in the other groups. This finding has some inconsistencies pertaining to the concepts obtained from Qualis-CAPES in 2007 by the other two groups. In addition, we did not find any significant influence of selfquoting in the annals of Enanpads or the temporal window for calculating the impact factor. These results enabled us to reach a conclusion on the viability of the use of the impact factor as a relevant criterion in the evaluation policy of periodicals. This is not about considering the unidimensional quality concept but rather about recognizing that the repercussion of a periodical reflects the interest sparked by the articles published in it in the construction of scientific knowledge