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Tijolos perfurados com melhores características isolantes térmicas

Esta dissertação teve como principal objetivo a simulação numérica dos processos de transferência de calor nos tijolos perfurados, e avaliar a performance de tijolos com geometrias de perfuração diferentes das formas usuais quadrangular ou retangular, em busca das geometrias de perfuração conducentes às melhores características de isolamento térmico dos tijolos perfurados. O trabalho iniciou-se pela simulação n...

Activity of the Lupane isolated from Combretum leprosum against Leishmania amaz...

This paper describes the activity of the ethanolic extract (EE), obtained from the fruits of Combretum leprosum, the triterpene 3β, 6β, 16β-trihydroxylup-20(29)-ene (1) and its synthetic derivatives 1a-1d on Leishmania amazonensis promastigotes. The EE displayed leishmanicidal activity and the IC50 was 24.8 mg mL-1. However, the triterpene 3β, 6β, 16β-trihydroxylup-20(29)-ene (1), ...

Propolis influence on erythrocyte membrane disorder (hereditaryspherocytosis): ...

Propolis is a resinous substance collected from plants by bees. Its composition depends on the vegetation, the season, and the source area. It usually contains many chemical compounds such as polyphenols, steroids and amino acids. The hereditary spherocytosis (HS) is a type of anaemia characterized by microcytic and hyperchromic red cells, spherical in shape and without central pallor. Clinically, subjects pres...

Propólis ao longo da história da humanidade

O própolis é uma mistura complexa de substâncias recolhida pelas abelhas da espécie Apis mellifera, dos brotos de algumas árvores e plantas, que contêm substâncias como materiais lipofilicos, látex, resinas, bem como de exsudados de feridas nas plantas (Bankova, 2005; Castaldo and Capasso, 2002; Lustosa et al., 2008). A abelha recolhe os exsudados com as suas mandíbulas, mistura com a cera por si produzida, e c...

Propolis influence on erythrocyte membrane disorder (hereditary spherocytosis):...

Propolis is a resinous substance collected from plants by bees. Its composition depends on the vegetation, the season, and the source area. It usually contains many chemical compounds such as polyphenols, steroids and amino acids. The hereditary spherocytosis (HS) is a type of anaemia characterized by microcytic and hyperchromic red cells, spherical in shape and without central pallor. Clinically, subjects pre...

Honeybee-collected pollen from five Portuguese Natural Parks: palynological ori...

The aim of this study was to determine the palynological origin, phenolic content, antioxidant and antimicrobial properties of pollen from five Portuguese Natural-Parks [Parque Nacional Peneda Gerês (PNPG); Parque Natural do Montesinho (PNM); Parque Natural do Alvão (PNA); Parque Natural da Serra da Estrela (PNSE) and Parque Natural do Douro Internacional (PNDI)]. Eight families were found in the mixture of bee...

Efeitos terapêuticos do própolis na saúde humana

O própolis na actualidade é considerado um dos produtos naturais de maior destaque nos estudos farmacológicos. Como já foi referido no artigo anterior, é um produto conhecido pelas diversas propriedades biológicas que possui: antimicrobiana, antiviral, antiinflamatória, imunomodelatória e anti-tumoral (Lustosa et al., 2008; Sforcin, 2007; Simoes et al., 2008a).

Propolis influence on erythrocyte membrane disorder (hereditary spherocytosis):...

Honeybee-collected pollen from five Portuguese Natural Parks: palynological ori...

Physicochemical, microbiological and antimicrobial properties of commercial hon...

The present study aimed to characterize five commercial honeys available in the Portuguese market in respect to their floral origins, physicochemical parameters and microbial safety and commercial quality assessment. Pollen profile, colour, moisture content, ash, acidity, electrical conductivity, pH, reducing sugars, apparent sucrose and HMF were the parameters analysed in each honey sample. Aerobic mesophiles,...