Photochemical determination of the interactions between surfactants and polyelectrolytes

The interaction of polyelectrolytes with oppositely charged ionic surfactants was studied at low surfactant concentrations using photochemical bound and free probes. Free probes migrate to initially formed pre-aggregates in systems with high charge- density polyelectrolytes, giving rise to excimer emission. For these systems the initial aggregation process seems to be due to electrostatic interactions. For larger surfactants or copolymers containing larger proportions of neutral monomer that interactions are of hydrophobic nature.

Períodes de controle de Brachiaria sp e seus reflexos na produtividade de Eucalyptus grandis

A field trial was conduced in Piratininga, São Paulo State, Brazil, from August to 1991 to May 1999, aiming to study the effects of weed interference on the productivity of Eucalyptus grandis W. Hill Ex Maiden. The experimental design was complete randomized blocks with four replications. The treatments consisted of different extensions and times of the weed free period. The weed free periods were divided in two groups. In the first one, the weed free period were from the Eucalyptus planting to 28, 56, 112, 140, 168, 224, 278 and 360 days. In the second group the weed free period began at 0, 28, 56, 112, 140, 168, 224 and 278 days after the planting and finished at 364 days. The main weeds were Brachiaria decumbens and Brachiaria brizantha. The eucalypt plants were strong susceptive at weed interference at 12 months after planting, it was showing PAI of 12 and 6 days, when to consider 2 and 5% reduction on height. Although, to assure crop productivity at Piratininga it was necessary to maintain a weed free period of to 364 and 365 days after planting (PTPI) at 12 months, 194 and 166 days after planting at 24 months, 188 and 130 days after planting at 36 months, 88 and 54 days after planting at 48 months and 155 and 133 days after planting at 78 months, when to consider 2 an 5% reduction on heigth. But, if when to consider the DAP, the PTPI was 242 and 200 days after planting at 24 months, 208 and 153 days after planting at 36 months, 224 and 150 days after planting at 48 months and 134 and 119 days after planting at 78 months. Although when to consider the wood volume it was necessary to keep the weed free from the planting to 153 and 142 days at 36 months after planting, 99 and 91 days at 48 months after planting and 92 and 72 days at 78 months after planting (crop). However, in area to suggest the recuperation the eucalypt plants at weed Interference.

Study of antioxidant activity of non-conventional Brazilian fruits

This study aimed to analyze the proximate composition of seeds from some non-conventional Brazilian fruits, as well as to evaluate the antioxidant activity through DPPH • free radical and to quantify the total phenolic compounds. To obtain the extracts, dried and crushed seeds were extracted with ethanol for 30 min, in a ratio of 1:3 (seeds:ethyl alcohol), under continuous agitation, at room temperature. Then, the mixtures were filtered and the supernatants were subjected to rotary evaporator under pressure reduced to 40 °C. The results report that the seeds of non-conventional fruits are remarkable sources of lipids, and the extraction of oil from these seeds could be an alternative for the commercial utilization of waste. They also presented significant percentages of protein and carbohydrates. Ethanol extracts of seeds from non-conventional Brazilian fruits showed relevant antioxidant activity and high amount of phenolic compounds. Therefore Brazilian non-conventional fruits can be used as functional food products or feed. © 2011 Association of Food Scientists & Technologists (India).

Awaking the vacuum with spheroidal shells

It has been shown that well-behaved spacetimes may induce the vacuum fluctuations of some nonminimally coupled free scalar fields to go through a phase of exponential growth. Here, we discuss this mechanism in the context of spheroidal thin shells emphasizing the consequences of deviations from spherical symmetry. © 2013 American Physical Society.

Relação entre estresse de radiação ultravioleta-b e óxido nítrico em plantas de eucalipto

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise do fenômeno de cavitação em bomba centrífuga

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A regional basic income: towards the eradication of extreme poverty in Central America

Incluye Bibliografía

Captura de carbono y desarrollo forestal sustentable en la Patagonia argentina: sinergias y desafíos

Incluye Bibliografía

Interação genótipo-ambiente para a produção de leite em bubalinos no Brasil e na Colômbia

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

Efeito de reagentes de branqueamento nas propriedaes físicas e mecânicas da polpa de celulose Kraft de eucalipto

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

Estudo do efeito springback em aços avançados de alta resistência aplicados a indústria automobilística

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Um sistema com um bloco de teflon e um bastão abrasivo para a limpeza da superfície de corte de rebolos

Pós-graduação em Engenharia Mecânica - FEB

Ontologia empresarial do modelo de referência MPS para software (MR-MPS-SW) com foco nos níveis G e F

Pós-graduação em Ciência da Computação - IBILCE

Avaliação da resistência de cultivares de amendoim de hábitos de crescimento ereto e rasteiro a Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

Pós-graduação em Agronomia - FEIS

Resistência de cultivares de soja a Spodoptera frugiperda (J. E. SMITH) (LEPIDOPTERA: NOCTUIDAE

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)