Lattice effects in the quasi-two-dimensional valence-bond-solid Mott insulator EtMe3P[Pd(dmit)(2)](2)

The organic charge-transfer salt EtMe3P[Pd(dmit)(2)](2) is a quasi-two-dimensional Mott insulator with localized spins S = 1/2 residing on a distorted triangular lattice. Here we report measurements of the uniaxial thermal expansion coefficients alpha(i) along the in-plane i = a and c axis as well as along the out-of-plane b axis for temperatures 1.4 K <= T <= 200 K. Particular attention is paid to the lattice effects around the phase transition at T-VBS = 25 K into a low-temperature valence-bond-solid phase and the paramagnetic regime above where effects of short-range antiferromagnetic correlations can be expected. The salient results of our study include (i) the observation of strongly anisotropic lattice distortions accompanying the formation of the valence-bond-solid phase, and (ii) a distinct anomaly in the thermal expansion coefficients in the paramagnetic regime around 40 K. Our results demonstrate that upon cooling through T-VBS the in-plane c axis, along which the valence bonds form, contracts while the second in-plane a axis elongates by the same relative amount. Surprisingly, the dominant effect is observed for the out-of-plane b axis which shrinks significantly upon cooling through T-VBS. The pronounced anomaly in alpha(i) around 40 K is attributed to short-range magnetic correlations. It is argued that the position of this maximum, relative to that in the magnetic susceptibility around 70 K, speaks in favor of a more anisotropic triangular-lattice scenario for this compound than previously thought.

Effect of hydrolyzed copra meal separately or in combination with Bacillus cereus var. toyoi on growth performance of broiler chickens

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

O conceito de ecossistema na produção acadêmica brasileira em educação ambiental: construção de significados e sentidos

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A indústria farmacêutica da América Latina: um estudo comparativo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Uptake of Seeds Secondary Metabolites by Virola surinamensis Seedlings

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Botanical extracts: alternative control for silverleaf whitefly management in tomato

Bemisia tabaci (Hemiptera: Aleyrodidae) biotype B is one of the most limiting pests of tomato crops in the world. Tomato yield is currently dependent on the use of pesticides, which are problematic to farmers, consumers and the environment. A promising alternative to reduce the harmful effects caused by the indiscriminated use of synthetic insecticides is the use of insecticides of botanical origin. This study aimed to evaluate the effect of 3% (w/v) aqueous extracts from different structures of thirteen botanical species on the behavior of B. tabaci biotype B adults, as well as insecticidal activity of such aqueous extracts on B. tabaci eggs, nymphs, and adults infesting tomato plants. A distilled water solution was used as a negative control, and thiamethoxam insecticide (18 g/100 L of water) as a positive control. Leaf extract of Toona ciliata was observed to have the most efficient inhibitory effect in tests of extracts on whitefly behavior. Furthermore, the use of leaf extract of Toona ciliata led to the most drastic reduction in the number of adults and eggs on tomato leaflets. Leaf extract of Piper aduncum led to the greatest observed ovicidal effect (78.00% of non-hatched nymphs); however it was not effective against nymphs and adults. The leaf extracts of Trichilia pallida, Trichilia casaretti, and Toona ciliata showed the highest control indexes (67.9, 60.3, and 55.1%, respectively). For adults mortality, T. pallida was the most effective (72.8%). Our results indicate that application of extracts of T. pallida, T. ciliata, and T. casaretti are promising strategies to manage B. tabaci biotype B on tomato.

Study of Salmonella typhimurium mutagenicity assay of (Z)-piplartine by the Ames test

Processo FAPESP

Composition and antifungal activity against Candida albicans, C. parapsilopisis, Candida krusei and Cryptococcus neoformans of essential oils from leaves of Piper and Peperomia species

This study was addressed to investigate the composition and antifungal activity of essential oils from leaves of Piperaceae species (Piper aduncum, Piper amalago, Piper cernuum, Piper diospyrifolium, Piper crassinervium, Piper gaudichaudianum, Piper solmsianum, Piper regnellii, Piper tuberculatum, Piper umbelata and Peperomia obtusifolia) against Candida albicans, C. parapsilosis, C. krusei and Cryptococcus neoformans. The essential oils from P. aduncum, P. gaudichaudianum and P. solmsianum showed the highest antifungal activity against Cryptococcus neoformans with the MIC of 62.5, 62.5 and 3.9 mg.mL-1, respectively. The oil from P. gaudichaudianum showed activity against C. krusei with MIC of 31.25 mg.mL-1.

Capacidade funcional, estado nutricional e consumo alimentar em idosos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Neolignans from fruits of Virola elongata

Fruits of Virola elongata contain, besides the furofuranoid lignans eudesmin, epieudesmin and fargesin, the aryl-benzyl-methyl tetrahydrofuran neolignans magnostellins A and C. The absolute configuration of the magnostellins was detennined.

Ensino de leitura de sentenças: contribuições da análise do comportamento

O paradigma da equivalência de estímulos tem sido pouco usado para estudar o ensino de leitura de sentenças. Assim, o presente estudo avaliou o efeito de um procedimento de ensino e testes de relações condicionais seguidos pelo encadeamento de palavras sobre a leitura com compreensão de sentenças e a generalização de leitura. Participaram oito escolares, com 7 e 9 anos de idade. O procedimento incluiu pré e pós-teste, três fases de ensino e testes de leitura com compreensão, um teste de conectividade e um teste de construção de sentenças. A leitura de palavras e de sentenças melhorou do pré para o pós-teste em todos os casos, demonstrando que o procedimento foi efetivo para ensinar leitura com compreensão de sentenças.

Estudos nacionais sobre o ensino para cegos: uma revisão bibliográfica

O presente artigo tem como objetivo apresentar uma revisão bibliográfica dos estudos nacionais acerca do ensino curricular para cegos. Foi realizada uma busca sistemática em três bases de dados: Google Acadêmico, Scielo e Lilacs, de estudos publicados no período de 2004 a 2014, que tivessem em seu título um dos seguintes descritores: alunos cegos; alunos deficientes visuais; crianças cegas; crianças deficientes visuais. Foram localizados 188 estudos e 56 selecionados dentro dos critérios estabelecidos. Fez-se a leitura integral desses e definiram-se cinco categorias de análise: tipo de estudo; participantes; tipo de abordagem; tipo de discussão e matrizes curriculares. Para cada categoria, foram estabelecidas subcategorias. Ao total 26 subcategorias foram descritas. Os resultados indicam que o Google Acadêmico é a base de dados com maior número de títulos encontrados (188/156); a Scielo apresenta melhor eficiência na relação encontrado x selecionado (12/10). Nas subcategorias de análise, as maiores frequências são identificadas nos estudos empíricos (22); junto a crianças (19); de análises qualitativas (21); na matriz curricular de Educação Física (sete) e na subcategoria relacionamento social (16). Contudo, os estudos são convergentes em apontar que as principais dificuldades no ensino às pessoas cegas se referem a deficiências na formação de professores, onde, normalmente, não são discutidos métodos de ensino e produção de material para trabalhar com essa população específica. Em conclusão, além de realizar um mapeamento dos estudos que têm sido conduzidos junto a alunos cegos nos últimos dez anos, este artigo aponta para lacunas na literatura e direciona futuras investigações na área.

Collaboration as a Foundation for the Project Approach in Family Child Care

Supporting children's curiosity was considered important at my family child care home. How could we best achieve this? As my assistant caregiver Deb and 1 attended professional development workshops, we began to wonder if the project approach (Helm & Katz 2001) would be an effective means of supporting inquiry and collaborative learning. Before we would commit ourselves, we wanted to learn more. We had many questions. Just what is the project approach? What does it look like? How will it support children's learning? What do we need to be successful with it? The literature suggested many examples of successful projects at child care centers and preschools (Breig-Allen et al. 1998; Harkem: 1999; Beneke 2000; Glassman & Whaley 2000). Our challenge was how to adapt the project approach to our home child care situations.

Secondary Metabolites from the Phloem of Piper solmsianum (Piperaceae) in the Honeydew of Edessa meditabunda

Introduction The phytochemistry of species of the genus Piper has been studied extensively, including Piper solmsianum. However, no studies have addressed the phytochemistry of the sap content of Piper species. Objective To evaluate the transferring of secondary compounds from the saps of P. solmsianum to the honeydew of Edessa meditabunda. Methodology The honeydew of E. meditabunda and saps of P. solmsianum were analysed by GC-MS, H-1-NMR and LC-MS. Results The lignan (-)-grandisin and the phenylpropanoid (E)-isoelemicin were detected in both saps of P. solmsianum and honeydew of E. meditabunda. Conclusion Analysis of honeydew secreted by the sap-sucking insect E. meditabunda indicated that (-)-grandisin and (E)-isoelemicin are absorbed from the phloem of Piper solmsianum. Copyright (c) 2012 John Wiley & Sons, Ltd.

Larvicidal activity of Piper tuberculatum on Spodoptera frugiperda (Lepidoptera: Noctuidae) under laboratory conditions

The larvicidal activity of the neotropical "matico" Piper tuberculatum was evaluated. The secondary compounds were extracted of leaves, stems and mature spikes with fruits and seeds from wild plants and in vitro plants of Piper tuberculatum. The acute toxicities to the fall armyworm, Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae), of extracts of spikes with fruits and seeds and in vitro plants of P tuberculatum were evaluated by means of contact bioassays. Only CH2Cl2:MeOH (2:1) and EtOH extracts of mature spikes and CH2C12:MeOH (2:1) extract from in vitro plants showed significant levels of larval mortality. The CH2Cl2:MeOH (2:1) and EtOH extracts of mature spikes caused 90% mortality when doses of 0.1850 mg/mu L were applied to the S. frugiperda in 24 and 48 h of exposure, respectively. The CH2Cl2:MeOH (2:1) extract from in vitro plants caused 95% mortality when doses of 0.1850 mg/mu L were too applied in 48 h of exposure. The mature spikes test best results were: LD50 0.001 mg/mu L with EtOH and 0.007 mg/mu L with CH2Cl2:MeOH (2:1) and LD90 0.027 mg/mu L with EtOH and 0.103 mg/mu L with CH2Cl2:MeOH (2:1); and, in the case of in vitro plants, only CH2Cl2:MeOH (2:1) extract was: LD50 0.003 mg/mu L and LD90 0.060 mg/mu L. The potential value of extracts derived from P. tuberculatum as efficient insecticides against S.frugiperda is discussed.