Dinâmica populacional e análise da variação genética do camarão barba-ruça Artemesia longinaris Spence Bate, 1888 (Crustacea Penaeidae)

Pós-graduação em Ciências Biológicas (Zoologia) - IBB

Ictiofauna de lagoas marginais sazonalmente isoladas, rio Turvo, bacia do rio Grande, Alto Paraná, SP

Pós-graduação em Aquicultura - FCAV

A urdidura espacial do capital e do trabalho no cerrado do sudoeste goiano

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ações afirmativas e inclusão de negros por cotas raciais nos serviços públicos do Paraná

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Gases de efeito estufa produzidos pela combustão de biomassa

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Uma proposta de abordagem das relações semântico-cognitivas em processos de gramaticalização

Este estudo propõe uma abordagem específica da mudança semântico-cognitiva, em processos de gramaticalização, a partir da exploração de graus de não discretude conceitual e complexidade cognitiva crescente, conforme estudos de Kortmann (1997) a partir de subordinadores de base adverbial. O universo de investigação é constituído de textos medialmente escritos (editoriais, cartas e e-mails) e falados (amostras do Banco de Dados IBORUNA), representativos dos séculos XVIII a XXI. Os resultados mostram que, em relação aos padrões de usos juntivos de assim focalizados a partir de Halliday (1985), a saber, juntor coordenativo conclusivo (P assim Q), comparativos, conformativos (P assim como Q), temporal (Assim que Q, P) e contrastivo (P, mesmo assim Q), a análise das relações semântico-cognitivas no processo de GR de assim forneceu-nos uma escala crescente de complexidade cognitiva associada à discretude semântica e uma especificação das relações interoracionais desempenhadas por esses padrões. Os resultados dessa análise permitiram a proposta de uma relação tridimensional de derivação entre os domínios cognitivos, apontando Modo como a macrofunção mais produtiva nos dados.

Imagens hiperespectrais no monitoramento da nutrição em citros

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Photochemical transformation of antibiotics by excitation of Fe(III)-complexes in aqueous medium

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Assessing the replacement of lead in solders: effects on resource use and human health

Human health and environmental concerns are not usually considered at the same time. Tin-lead solders are still widely used in several countries, including Brazil, by manufacturers of electronic assemblies. One of the options to reduce or eliminate lead from the manufacturing environment is its replacement with lead-free alloys. This paper applies emergy synthesis and the DALY indicator (Disability Adjusted Life Years) to assess the impact of manufacturing soft solder using tin, lead and other metals on the environment and on human health. The results are presented together with the company's financial results and the results calculated from the Brazilian statistical value of life. The calculation of emergy per unit showed that more resources are used to produce one ton of lead-free solders than to produce one ton of tin-lead solders, with and without the use of consumer waste recovered through a reverse logistics system. The assessment of air emissions during solder production shows that the benefits of the lead-free solution are limited to the stages of manufacturing and assembling. The tin-lead solder appears as the best option in terms of resource use efficiency and with respect to emissions into the atmosphere when the mining stage is included. A discussion on the influence of the system's boundaries on the decision-making process for materials substitution is presented. (C) 2012 Elsevier Ltd. All rights reserved.

Photosynthate partitioning and morphoanatomical aspects of photomorphogenic mutants of tomato

The aim of this study was to analyze photosynthate partitioning in tomato photomorphogenic mutants at the ends of the vegetative (40 days after emergence [DAE]) and reproductive (69 DAE) stages and to determine its interaction with morphoanatomical aspects. The mutants aurea (au), phytochrome-deficient, high pigment-1 (hp1), light-exaggerated response, were studied along with the non-mutant Micro-Tom (MT) cultivar. The plants were analyzed at 40 and 68 DAE to identify photosynthate source organs and tissues as well as the target organs of remobilized photosynthate during the reproductive stage. The plants were evaluated for their internal and external morphology as well as the percentage of dry mass of their organs. Photosynthate allocation in the hp1 mutant occurred primarily in the roots and leaves, and allocation in the au mutant occurred primarily in fruits. The au mutant showed a high capacity for photosynthate remobilization to fruit during the reproductive stage, and the predominant sources of these remobilized photosynthates were the leaf spongy parenchyma, the root vascular cylinder and the marrow stem.

Kinetic role of a histidine residue in the T1 copper site of the laccase from Rigidoporus lignosus

Laccases (benzendiol:oxygen oxidoreductases; EC 1.10.3.2) catalyze the oxidation of a broad range of substrates, such as polyphenols, dyes and pollutants, and thus these enzymes are widely applied in industrial, biotechnological and environmental fields. In order to improve their biotechnological applications, a deep knowledge of structural factors involved in controlling their activity, in various experimental conditions and on different substrates, is required. In the present study, a laccase from the mushroom Rigidoporus lignosus was kinetically characterized. In particular, the stability, the effects of pH, ionic strength and fluoride ion concentration on the kinetic parameters were investigated, using three di-hydroxy-benzene isomers (1,2-dihydroxy-benzene, 1,3-dihydroxy-benzene and 1,4-dihydroxy-benzene) as substrates. The catalytic constant values of the laccase showed a bell-shaped pH profile, with the same optimum pH and pK(a) values for all tested substrates. This behavior appears to be due to the presence of an ionizable residue in the enzyme active site. To identify this residue, the enzyme was derivatized with diethylpyrocarbonate to modify accessible histidine residues, which, according to structural data, are present in the active site of this enzyme. The kinetic behavior of the derivatized laccase was compared with that of the native enzyme and the derivatized residues were identified by mass spectrometry. Mass spectrometry and kinetic results suggest the main role of His-457 in the control of the catalytic activity of laccase from R. lignosus. (C) 2013 Elsevier B.V. All rights reserved.

Influence of Lentinus edodes and Agaricus blazei extracts on the prevention of oxidation and retention of tocopherols in soybean oil in an accelerated storage test

This study aimed to evaluate the influence of the methanol extracts of mushrooms Lentinus edodes and Agaricus blazei on the retention of tocopherols in soybean oil, when subjected to an accelerated storage test. The following treatments were subjected to an accelerated storage test in an oven at 60 A degrees C for 15 days: Control (soybean oil without antioxidants), TBHQ (soybean oil + 100 mg/kg of TBHQ), BHT (soybean oil + 100 mg/kg of BHT), L. edodes (soybean oil + 3,500 mg/kg of L. edodes extract) and A. blazei (soybean oil + 3,500 mg/kg of A. blazei extract). The samples were analyzed for tocopherols naturally present in soybean oil and mass gain. The results showed, the time required to reach a 0.5% increase in mass was 13 days for TBHQ and 15 days for A. blazei. The content of tocopherols for TBHQ was 457.50 mg/kg and the A. blazei, 477.20 mg/kg.

The first frequency of cantilevered bars with geometric effect: a mathematical and experimental evaluation

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Evaluation of Different Conditions of Contact for Caprolactam Migration from Multilayer Polyamide Films into Food Simulants

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O uso de bebida alcoólica por escolares

A bebida alcoólica, apesar dos diversos danos que causa à população em geral, e em especial aos jovens, ainda não é considerada como droga, e seu uso, em muitos contextos é até incentivado. Identificar o perfil de grupos de risco para o uso de álcool entre escolares pode auxiliar na compreensão dessa prática e servir de suporte à implantação de políticas públicas de prevenção na própria escola. O objetivo deste estudo foi o de verificar a ocorrência de uso nocivo de bebida alcoólica por escolares do 9º ano do ensino fundamental e suas implicações para o surgimento de comportamentos de risco em contexto social. A pesquisa transcorreu com 457 escolares nos anos de 2009 e 2010. Como instrumento de coleta de dados foi utilizado o Alcohol Use Disorders Identification Test – AUDIT. Foi verificado que 224 escolares (49,0 %), apesar de o álcool ser proibido a menores de 18 anos, fizeram uso de bebida alcoólica no último ano, e 1,6% foram classificados em níveis preocupantes de uso da substância. Concluiu-se que há necessidade de criação de projetos destinados à prevenção do uso de álcool entre os adolescentes, pois entre os escolares que relataram uso de álcool, na população estudada, sete apresentaram comportamento de risco ao atingirem pontuações acima de 19 no questionário AUDIT.