5 resultados para distribution transformer life extension
em SAPIENTIA - Universidade do Algarve - Portugal
Resumo:
In order to produce packaging films with a broad spectrum of action on microorganisms, the
effect of two antimicrobial (AM) to be included in the films, carvacrol and GSE were studied
separately on different microorganisms. Carvacrol was more effective against the grampositive
bacteria than against the gram-negative bacterium. GSE was not effective against
yeast. Subsequently, a search for optimal combinations of carvacrol, GSE and the addition of
chitosan (as a third component with film forming properties) was carried out. Response
surface analysis showed several synergetic effects and three optimal AM combinations
(OAMC) were obtained for each microorganism. The experimental validation confirmed that
the optimal solutions found can successfully predict the response for each microorganism.
The optimization of mixtures of the three components, but this time, using the same
concentration for all microorganisms, was also studied to obtain an OAMC with wide spectrum
of activity. The results of the response surface analysis showed several synergistic effects for
all microorganisms. Three OAMC, OAMC-1, OAMC-2, OAMC-3, were found to be the optimal
mixtures for all microorganisms. The radical scavenging activity (RSA) of the different agents
was then compared with a standard antioxidant (AOX) BHT, at different concentrations; as also
at the OAMC. The RSA increased in the following order: chitosan
Resumo:
Dissertação mest., Gestão da Água e da Costa, Universidade do Algarve, 2007
Resumo:
Tese de doutoramento, Ciências do Mar, Faculdade de Ciências e Tecnologia, Universidade do Algarve, 2015
Resumo:
Holothurian populations are under pressure worldwide because of increasing demand for beche-de-mer, mainly for Asian consumption. Importations to this area from new temperate fishing grounds provide economic opportunities but also raise concerns regarding future over-exploitation. Studies on the habitat preferences and movements of sea cucumbers are important for the management of sea cucumber stocks and sizing of no-take zones, but information on the ecology and behavior of temperate sea cucumbers is scarce. This study describes the small-scale distribution and movement patterns of Holothuria arguinensis in the intertidal zone of the Ria Formosa national park (Portugal).Mark/recapture studieswere performed to record theirmovements over time on different habitats (sand and seagrass). H. arguinensis preferred seagrass habitats and did not show a size or life stage-related spatial segregation. Its density was 563 ind. ha−1 and mean movement speed was 10 m per day. Movement speed did not differ between habitats and the direction of movement was offshore during the day and shoreward during the night. Median home range size was 35 m2 and overlap among home ranges was 84%. H. arguinensis' high abundance, close association with seagrass and easy catchability in the intertidal zone, indicate the importance of including intertidal lagoons in future studies on temperate sea cucumber ecology since those systems might require different management strategies than fully submerged habitats.
Resumo:
Marine protected areas (MPAs) are today's most important tools for the spatial management and conservation of marine species. Yet, the true protection that they provide to individual fish is unknown, leading to uncertainty associated with MPA effectiveness. In this study, conducted in a recently established coastal MPA in Portugal, we combined the results of individual home range estimation and population distribution models for 3 species of commercial importance and contrasting life histories to infer (1) the size of suitable areas where they would be fully protected and (2) the vulnerability to fishing mortality of each species. Results show that the relationship between MPA size and effective protection is strongly modulated by both the species' home range and the distribution of suitable habitat inside and outside the MPA. This approach provides a better insight into the true potential of MPAs in effectively protecting marine species, since it can reveal the size and location of the areas where protection is most effective and a clear, quantitative estimation of the vulnerability to fishing throughout an entire MPA.