A leitura como um processo cognitivo
Figueiredo, Olívia Maria
1999-01-01
Search results
15 records were found.
The objective of this study was to assess the antimicrobial capability of non-chemically altered chitosan
as an alternative to traditional antimicrobials used in the treatment of oral infections. The action
mechanism of chitosan was also ascertained. High and low molecular weight chitosan showed antimicrobial
activity at low concentrations for all tested bacteria with the MICs varying between 1 and 7 mg/
ml with a drop of efficacy relatively to the action of LMW chitosan. In addition chitosan showed also to be
an effective bactericidal presenting bactericidal effect within 8 h at the latest. Additionally the evaluation
of chitosan’s action mechanism showed that both MWs acted upon the bacterial cell wall and were not
capable of interacting with the intracellular substances, as showed by the inefficacy obtained in the
flocculati...
tModern dentistry emphasizes the importance of dental plaque control to improve oral health. To that endthe development of oral care formulations has been geared toward the incorporation of antiplaque agentsthat may play a crucial role in oral health maintenance. In later years the research into antiplaque agentshas led to the discovery of compounds with significant capability to affect biofilm formation. Among thesecompounds was chitosan, a polysaccharide which showed great ability to interfere with Streptococcusmutans biofilm formation. As such the aim of this work was to incorporate chitosan into a mouthwashmatrix and assess its effect upon biofilm formation of oral microorganisms. This assessment was per-formed via study of the impact the mouthwash upon microbial adherence, biofilm formation and maturebiofilms. Additionally, the ac...
Anthocyanins have gathered the attention of the scientific community mostly due to their vast
range of possible applications. They have been the center point of the research in many different
fields, among which is food development, where their innate coloring, antioxidant capacity and
biological potential open interesting venues to the development of new food additives and
functional foodstuffs. As the range of application grows, so does the necessity to obtain these
compounds and since they are naturally occurring, the most common way to obtain anthocyanins
is to extract them from different plant sources, such as fruits and flowers. Several efforts have
been made to develop methods that allow for better extraction yields and higher purification rates
therefore this review aims to compile the information regarding extraction a...
info:eu-repo/semantics/publishedVersion
Eighteen healthy skeletally mature (3 years old) ewes, with an average weight of 45 kg, of the
Portuguese Churra da Terra Quente breed were used to evaluate the normal values of total
and bone-specific isoform of alkaline phosphatase serum activities (ALP and BALP,
respectively) and serum osteocalcin (OC) and their correlation with the serum minerals –
calcium (Ca), phosphorus (P), magnesium (Mg) and ionized calcium (Ca2þ). The sheep were
maintained under controlled environmental conditions (constant diurnal photoperiod cycle
and identical husbandry and feeding) for six weeks before the collection of the blood samples.
The measurement of the total ALP and serum minerals was performed with automated
biochemistry analysers using the BioMe´rieuxw kits, the serum electrolyte Ca2þ Diametrics
Medical, Incw specific cassettes and the...
