Comportamento alimentar e resistência à inanição de larvas de camarões ornamentais do género Lysmata (Decapoda: Hippolytidae)

Dissertação mest., Biologia Marinha, Universidade do Algarve, 2008The present study describes the effect of starvation on the survival of early zoeal stages of Lysmata amboinensis, L. debelius, L. boggessi, L. seticaudata. Studied species occupy different habitats and exhibit different levels of tolerance to the absence of food. Only newly hatched larvae of L. seticaudata and L. boggessi display facultative primary lecithotrophy, moulting from zoea I to zoea II when starved. All studied species show secondary facultative lecithotrophy on the second zoeal stage, being able to moult to zoea III in the absence of food. Nevertheless, this ability was only recorded in larvae at the second zoeal stage which have not been previously exposed to starvation in zoea I. This is the firts record of secondary facultative lecithotrophy among caridena shrimps. Newly hatched larvae of L. amboinensis, L. debelius, L. ankeri e L. seticaudata show a higher tolerance to starvation periods when kept in the dark, compared to photoperiods with 12 or 24 h of light. This fact may be due to a lower larval energetic consumption as a consequence of a decreased swimming activity. Light exposure is not a determinant factor for prey capture in Lysmata larvae, reinforcing the assumption of decapod crustacean larvae not being active predators. Newly hatched larvae of different studied species ingest similar amounts of Artemia nauplii, while L. ankeri and L. seticaudata are able to capture a higher number of enriched Artemia metanuplii. The comparison of morphological and biometrical larval features do not show a particular pattern, being insufficient to explain the differences recorded in the number of ingested preys. The ability displayed by these organisms to capture and ingest large sized preys (e.g. Artemia metanauplii) opens good perspectives for the use of inert diets during early zoeal stages

Determination of phytoextraction potential of plant speciesfor toxic elements in soils of abandoned sulphide-mining areas

This study has determined contamination levels in soils and plants from the Sa˜o Domingos mining area, Portugal, by k0-INAA. Total concentrations of As, Sb, Cr, Hg, Cu, Zn and Fe in soils were very high, exceeding the maximum limits in Portuguese legislation. Concentrations of toxic elements like As, Sb and Zn were highest in roots of Erica andevalensis, Juncus acutus, Agrostis castellana and Nicotiana glauca. Additionally, As, Br, Cr, Fe, Sb and Zn in all organs of most plants were above toxicity levels. Those species that accumulated relatively high concentrations of toxic elements in roots (and tops) may be cultivated for phytostabilisation of similar areas

A máquina escriturística: de Duchamp a Certeau

Nosso trabalho visa compreender a leitura que o historiador e antropólogo Michel De Certeau faz do projeto artístico mais ambicioso de Marcel Duchamp – O Grande Vidro. Na realização da pesquisa, buscamos entender como o pensador localizou a obra dentro de suas discussões teóricas e, mais, qual a relação de O Grande Vidro com os conceitos de arte predominantes em seus escritos

Transience analysis of bursty traffic with erbium doped fiber amplifiers

Copyright © [2009] IEEE. Reprinted from ICTON 2009. ISBN 978-1-4244-4826-5. This material is posted here with permission of the IEEE. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.In this paper, we investigate experimentally the impact of optical amplifiers, namely Erbium Doped Fiber Amplifiers (EDFA) on Optical Burst Switching (OBS) networks, operating at 2.5 Gb/s (typical bit rate for current passive optical networks - PON). Bursts with 212 – 1 and 216 – 1 pseudo random binary sequence (PRBS) were studied, with different idle times. The use of traffic with variable idle time was assessed in order to evaluate the effect on the burst initial amplitude. We also analyzed the performance of the packet based system by measuring the Q factor at the receiver and concluded that the performance is not affected by the type of traffic (variable or fixed idle times)

Durability assessment of external thermal insulation composite systems in urban and maritime environments

External Thermal Insulation Composite Systems (ETICS) are multilayer solutions which provide an enhanced thermal performance to the building envelope. However, significant anomalies can be detected on ETICS facades, in some cases shortly after the application of these systems. This study intends to evaluate and compare the durability of six commercially available ETICS after two years of outdoor exposure at both urban and maritime conditions in Portugal. The systems were characterized by means of non-destructive testing (i.e., visual and microscopic assessment, water transport properties, thermal conductivity, surface roughness), thus allowing to evaluate the performance loss throughout natural aging. The bio-susceptibility and aesthetic properties (color and gloss) were also investigated. Results showed that the performance and durability of the complete system is significantly affected by the rendering system formulation. The lime-based specimens obtained the highest rate of mold development after one year of aging in a maritime environment, becoming considerably darker and with lower surface gloss. Fungal analysis of this darkish stained area indicated the presence of mold species of the genera Alternaria, Didymella, Cladosporium and Epicoccum, and yeasts of the genera Vishniacozyma and Cystobasidium. An increase of both capillary water absorption and water vapor permeability was also registered for the aged lime-based specimens. Acrylic-based systems obtained lower capillary water absorption after aging and greater dirt deposition on their surfaces, especially in urban conditions. These systems had also higher color variation and surface gloss decrease and slightly higher mold growth, when compared with those aged in a maritime environment. Finally, no mold growth was detected on the silicate-based specimens after two years of aging. However, these specimens obtained higher capillary water absorption and lower vapor permeability after aging, possibly leading to moisture accumulation within the system. Results contribute towards the development of ETICS with enhanced performance and durability.info:eu-repo/semantics/publishedVersio

Local accommodation: from paradise to hell - the impact of Covid 19 and strategies to recover the investment, in Portugal

This study seeks to fill the epistemological gap regarding the impact of Covid 19 on local accommodation. The growth of Local Accommodation led to some good and bad results: for once, the old buildings were rebuilt as the owners saw a way to recover the investment, and some families found a way to increase their income, and on the other hand, the exponential growth created severe dangers to municipal institutions: the risk of ‘desertification’ of the center by local citizens, rent pressure, social polarization, amongst other risks, which led to the “gentrification phenomenon”. This pandemic situation brought the real destruction of this accommodation sector, as the fear of travelling, besides the cancelation of flights and sanitary restrictions change the face of tourism sector and the owners of local accommodation places struggle to survive. On the course of this study we propose to find some ways out of hell that step into this sector.info:eu-repo/semantics/publishedVersio

Durability assessment of external thermal insulation composite systems in urban and maritime environments

Funding Information: The authors acknowledge the Portuguese Foundation for Science and Technology (FCT) for funding the research project PTDC/ECI-EGC/30681/2017 (WGB_Shield – Shielding building facades for cities revitalization. Triple resistance to water, graffiti and biocolonization of external thermal insulation systems), the research units CERIS ( UIDB/04625/2020 ), CERENA ( UIDB/04028/2020 ) and iBB ( UIDP/04565/2020 ), the Associate Laboratory Institute for Health and Bioeconomy – i4HB ( LA/P/0140/2020 ), and the Ph.D. scholarship 2020.05180.BD (J. L. Parracha). The authors also acknowledge CIN, Saint-Gobain and Secil for the material supply and the Portuguese Institute for Sea and Atmosphere (IPMA) for the meteorological data. Funding Information: The authors acknowledge the Portuguese Foundation for Science and Technology (FCT) for funding the research project PTDC/ECI-EGC/30681/2017 (WGB_Shield – Shielding building facades for cities revitalization. Triple resistance to water, graffiti and biocolonization of external thermal insulation systems), the research units CERIS (UIDB/04625/2020), CERENA (UIDB/04028/2020) and iBB (UIDP/04565/2020), the Associate Laboratory Institute for Health and Bioeconomy – i4HB (LA/P/0140/2020), and the Ph.D. scholarship 2020.05180.BD (J. L. Parracha). The authors also acknowledge CIN, Saint-Gobain and Secil for the material supply and the Portuguese Institute for Sea and Atmosphere (IPMA) for the meteorological data. Publisher Copyright: © 2022 Elsevier B.V.External Thermal Insulation Composite Systems (ETICS) are multilayer solutions which provide an enhanced thermal performance to the building envelope. However, significant anomalies can be detected on ETICS facades, in some cases shortly after the application of these systems. This study intends to evaluate and compare the durability of six commercially available ETICS after two years of outdoor exposure at both urban and maritime conditions in Portugal. The systems were characterized by means of non-destructive testing (i.e., visual and microscopic assessment, water transport properties, thermal conductivity, surface roughness), thus allowing to evaluate the performance loss throughout natural aging. The bio-susceptibility and aesthetic properties (color and gloss) were also investigated. Results showed that the performance and durability of the complete system is significantly affected by the rendering system formulation. The lime-based specimens obtained the highest rate of mold development after one year of aging in a maritime environment, becoming considerably darker and with lower surface gloss. Fungal analysis of this darkish stained area indicated the presence of mold species of the genera Alternaria, Didymella, Cladosporium and Epicoccum, and yeasts of the genera Vishniacozyma and Cystobasidium. An increase of both capillary water absorption and water vapor permeability was also registered for the aged lime-based specimens. Acrylic-based systems obtained lower capillary water absorption after aging and greater dirt deposition on their surfaces, especially in urban conditions. These systems had also higher color variation and surface gloss decrease and slightly higher mold growth, when compared with those aged in a maritime environment. Finally, no mold growth was detected on the silicate-based specimens after two years of aging. However, these specimens obtained higher capillary water absorption and lower vapor permeability after aging, possibly leading to moisture accumulation within the system. Results contribute towards the development of ETICS with enhanced performance and durability.publishersversionpublishe