Browsing by Author "Silva, F."
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- Bioimplantable impedance and temperature monitor low power micro-system suitable for estrus detectionPublication . Miranda, N.; Morais, R.; Dias, M.; Viegas, C.; Silva, F.; Serôdio, C.; Almeida, J.; Azevedo, J.; Reis, M.C.Based on cyclic physiologic animal bioimpedance and body temperature a new method is being evaluated to predict estrus in dairy cattle with the aim of improving artificial insemination efficiency. Preceding in-vivo tests are being performed with a dedicated system based on the impedance converter AD5933, and a two-electrode configuration bioimplantable capsule. Acquired results will allow the optimal design of an implantable and autonomous low-power system. The implantable microsystem is being designed and simulated employing low-power techniques in a 0.35μm CMOS standard process.
- Negative impact on the reproductive potential of blue jack mackerel Trachurus picturatus by Kudoa infection of the ovaryPublication . Neves, A.; Gordo, I.; Sequeira, V.; Vieira, A.R.; Silva, E.; Silva, F.; Duarte, A.M.; Mendes, S.; Ganhão, R.; Peleteiro, M.C.; Assis, C.; Rebelo, R.; Magalhães, M.F.; Gil, M. M.; Gordo, L.S.Reproduction of Trachurus picturatus off the western Portuguese coast was studied over 1 yr. During histological analyses, the presence of Kudoa sp. was detected in advanced vitellogenic oocytes. Kudoa infections are known to cause economic loss through the induction of postmortem liquefaction of fish muscles, but ovarian infection as reported in this study will seriously affect the reproductive potential of the species and thus impact fisheries productivity. Only females showed gonad infection which led to total degradation of advanced vitellogenic oocytes. No macroscopic, somatic or condition indices revealed differences between infected and uninfected females, rendering this infection event a concealed suppression of reproduction.
- Tourism as a tool of community development: an ecotourism project in Cantanhez, Guinea-BissauPublication . Oliveira, F.; Silva, F.In recent decades the scientific community and various international organizations have provided a range of guidelines towards the development of more sustainable tourism. The responsible use of natural and cultural resources and the participation of local communities - with the involvement of the different actors in the development process - are inseparable aspects of sustainability's concept. However, when we try to put it into practice it appears that this is a very slow process, with many aspects that must be considered, especially in the case of underdeveloped regions. This paper focuses precisely on one of these regions - Cantanhez National Park, Guinea Bissau. This region has natural and cultural resources that are real treasures, which enhance the environmental and green forms of tourism; however, the structural problems of the country can be a real challenge to any type of initiative. The purpose of this communication is to present the ecotourism project in Cantanhez National Park, identifying the objectives, the first stages of the project implementation, the difficulties arising from the social, economic and political situation of the country and finally, its relevance in promoting community development. The realities that will be shared in this paper resulted from an initial visit to identify the needs of tourism planning, management and training in the communities directly involved.