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Valorization of canned sardine and mackerel residues through the extraction of ...

K10-montmorillonite as support for a cationic manganese(III)-salen complex

A commercial K10-montmorillonite was used as support for the immobilization of a cationic manganese(III)-salen complex. The catalytic behavior of the resulting material was tested in the enantioselective epoxidation of three different alkenes, viz.: styrene, α-methylstyrene and 6-cyano-2,2-dimethylchromene, at 0 ºC, using three different oxidant systems: m-chloroperoxybenzoic acid (m-CPBA) and N-methylmorp...

Simultaneous effect of irradiance and temperature on biochemical composition of...

The biochemical composition of microalgae can be modulated through the environmental conditions prevailing during growth. The simultaneous effects of irradiance and temperature on the biochemical composition of Pavlova lutheri were evaluated using an experimental star factorial design. Five levels were tested for each parameter (temperature, 10, 14, 18, 22 and 26°C; irradiance, 60, 105, 150, 195 and 240 μmol ph...

Gilded wood from the organ of the Church of Santa Cruz (Coimbra)

Gilded wood is an important part of Portuguese cultural heritage. We profit an intervention in the organ of the Church of Santa Cruz (Coimbra) to make a study on its gilded wood decoration. Historical sources indicate that the organ dates from the XV-XVI centuries, although it has suffered several restoration works over the centuries. Samples were collected from different places of the central part of the organ...

Microalgae and foods

Metabolic relationships between macro- and micronutrients, and the eicosapentae...

The use of specific microalgae as sources of polyunsaturated fatty acids (PUFA), for incorporation in either aquaculture or human diets, has been receiving increasing interest. The fatty acid profile of intracellular fats in a given species can, within certain limits, be modulated via manipulation of the culture growth conditions, namely nutrient availability. In attempts to shed further light on the effects of...

Microalgal reactors: a review of enclosed system designs and performances

One major challenge to industrial microalgal culturing is to devise and develop technical apparata, cultivation procedures and algal strains susceptible of undergoing substantial increases in efficiency of use of solar energy and carbon dioxide. Despite several research efforts developed to date, there is no such thing as “the best reactor system”- defined, in an absolute fashion, as the one able to achieve max...

Optimization of ω-3 fatty acid production by microalgae: Crossover effects of C...

The microalga Pavlova lutheri is a potential source of economically valuable docosahexaenoic and eicosapentaenoic acids. Specific chemical and physical culture conditions may enhance their biochemical synthesis. There are studies relating the effect of CO2 on growth; however, this parameter should not be assessed independently, as its effect strongly depends on the light intensity available. In this research, t...

Kinetic modeling of the autotrophic growth of pavlova lutheri: Study of the com...

The optimization and control of biochemical processes require the previous establishment of mathematical models that can describe the effect of process variables on their actual kinetics. Environmental temperature is a modulating factor to which the algal cells respond continuously by adjusting their rates of cellular reactions, their nutritional requirements, and, consequently, their biomass composition. Light...

Classificação e eliminação dos ruídos em imagens hiperespectrais pela análise s...

As imagens hiperespectrais são muito suscetíveis às interferências de ruídos, o que dificulta a identificação e a quantificação mineral. Portanto, torna-se fundamental o emprego de técnicas para minimizá-los. Um eficiente procedimento matemático para redução de ruídos é a Fração de Ruído Mínima (MNF). Esse método é derivado e análogo à transformação Análise de Componentes Principais, distinguindo-se por promove...