Coniferous bark hot steam treatment for the elimination of the pinewood nematode

In order to develop an artificial heat treatment to eliminate the pinewood nematode (PWN), Bursaphelenchus xylophilus, from coniferous bark, an industrial equipment, based on hot steam was build up which enables continuous bark treatment for more than 30 min with temperatures above 80ºC. Biological assays were performed using experimental units (bags) with Pinus pinaster bark and wood chips containing more than 100 000 PWN (.60% third dispersal juvenile s tage). The bags were heat treated for 30 min and the temperature inside monitored by temperature probes. The total number of live nematodes was quantified immediately after treatment and after incubation (25ºC for 15 days) and in both situations no nematodes were detected revealing efficacy in eliminating PWN from coniferous bark

Environmental benchmarks based on ecotoxicological assessment with planktonic species might not adequately protect benthic assemblages in lotic systems

Freshwater ecosystems face widespread diffuse and point-source contamination. Species Sensitivity Distributions (SSDs) have been used as a tool to determine chemical concentration benchmarks that represent protective levels for most species in the environment. Here we used a SSD approach to assess on the adequacy of standard planktonic organisms to reflect the response of benthic communities, critically supporting the structure and function of lotic ecosystems. For the purpose, SSDs reflecting non-lethal responses of standard planktonic and selected benthic organisms were built based on EC50 values (collected in the literature or estimated following testing herein) regarding three model contaminants: potassium dichromate (PD), 3,5-dichlorophenol (DCP) and lead chloride (LC). The derived HC5 estimates were discriminatory between chemicals and the uncertainty associated with the estimate was remarkably low. The HC5 estimates with corresponding uncertainty were generally within the same order of magnitude for the three chemicals tested, with better discrimination between chemicals regarding their hazardous potential being achieved for benthic organisms: DCP was clearly less hazardous than PD, but LC tends to be as hazardous as PD and DCP (assuming the confidence interval ranges). Moreover, benthic communities were more sensitive to both DCP and PD, in this later case the HC5 being lower by more than one order of magnitude than that found for planktonic communities; for LC, confidence intervals overlapped, preventing a feasible assumption regarding differential sensitivity of the compared communities. Microphytobenthos was highlighted as the most sensitive group to the three tested chemicals in SSDs covering the benthic compartment, while SSDs with planktonic organisms did not consistently show trends in sensitivity ordering. Overall, our results suggest that protective benchmarks retrieved from SSDs built with the responses of standard planktonic organisms (which are the most commonly used for regulation purposes) do not adequately protect benthic communities.publishe

Instalações para manutenção e desenvolvimento de matrizes de Batata-doce com alta sanidade.

bitstream/item/30916/1/Circular-76.pd

Study of the dust produced in rehabilitation works

"First International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2019)"Urban rehabilitation is becoming more frequent nowadays. With cities full of falling buildings and no space to build new ones, the only solution is to rehabilitate the existing heritage in order to give new life to the vacant buildings and repopulate the cities. A large amount of the built heritage suffers from advanced degradation, making the recovery, increasing the complexity of the rehabilitation and restoration intervention and implying a highly specialized interdisciplinary component. In this type of works more dust is produced than in a new work. In addition, the origin and composition of existing materials is often unknown and can therefore pose many risks to the health of workers. Meaning, dust is breathable and can remain in the air for a long period of time, being invisible to the naked eye and very light. When a building is being demolishing, the production of dust increases significantly. Depending on the type of materials to demolish, the risk of occupational diseases, or risks, to the health of workers may be great. To avoid such risks, preventive measures must be taken in the execution of the tasks. In this study, the dust of two rehabilitation works in the district of Viana do Castelo was studied through experimental tests in order to verify the composition of the demolished materials. Particles characterization was done, using scanning electron microscopy (SEM). Then, with the tests results, the chemical composition of the existing materials was analyzed in detail. After that, the chemical components of demolished materials were carefully studied to identify which of these particles could represent a risk to the workers? health. As a conclusion the preventive measures that workers must take when performing rehabilitation works are presented, depending on what type of materials they are potentially exposed.(undefined

LEARNING HOW TO WORK IN THE ARTS FIELD IN PORTUGAL: A BIOGRAPHICAL APPROACH TO THE MIGRANT ARTISTS’ TRAJECTORIES

The article considers the key dimensions of the life trajectories of the immigrant artists living in the Lisbon metropolitan area focusing on those related to the socialization process both in formal institutions and in a broader setting of informal learning. The authors conducted a sociological analysis of 20 biographical interviews with a heterogeneous set of individuals, including musicians, dancers and plastic artists. These interviews were a part of the research project on the social trajectories of migrant artists from the non-European Union countries living in Portugal. The results of the analysis show that formal and informal learning together with the migrant experience are intertwined and constitute the key factor in the configuration of migrant trajectories. There is often a mobility pattern across art styles, which makes differences between formal and informal circumstances in the life trajectories of migrant artists evident. Migration has a strong impact on the artistic work; this impact affects different areas of biographical experience: contact with the Portuguese culture, development of ethnic references, and participation in transnational art movements. The condition of immigrant artists generally implies a long trajectory of artistic training, including significant experiences of formal and informal learning in multiple social contexts throughout the life course. For those dedicated to the new transnational urban cultures (hip hop, graffiti, etc.), informal learning is the most important element. For those engaged in the traditional arts, the attendance of lengthy artistic programs seems to be a fundamental prerequisite for training and recognition. Together with the long and significant artists’ investments in their education, the sociological study also revealed the great vulnerability (and precariousness) of their life trajectories, and the lack of structures supporting their access to the labor market

Post-fire diversity and abundance in pine and eucalipt stands in Portugal: effects of biogeography, topography, forest type and post-fire management

This study concerned the mid-term regeneration of the woody understory vegetation of pure and mixed stands of Pinus pinaster Ait. and Eucalyptus globulus Labill. in northern and central Portugal following wildfires in 2005 and 2006. Pine and eucalypt stands are the most widespread and most fire-prone forest types in Portugal. The main aim was to investigate the importance of biogeography, topography, forest type and post-fire management operations in explaining the patterns in shrub diversity (species richness) and abundance (cover). To this end, 284 study sites in four distinct biogeographic regions were sampled 5 to 7 years following the last wildfire. At each site, the presence and cover of individual shrub species were estimated using 4 sub-plot of approximately 10 m2 each. The entire data set was analyzed by means of GLM using a total of seven explanatory variables: biogeographic region, forest type, three types post-fire management operations (soil tillage, tree harvesting, and shrub clearance), and two topographic variables (slope angle and elevation). The GLM analysis was also done for the individual biogeographic regions. Biogeographic region and slope steepness were key factors explaining shrub species richness, albeit the role of slope angle was possibly linked to the intensity of past land use. Biogeographic region equally played a significant role in explaining the cover of all shrubs together as well as of the shrubs of Leguminosae and Cistaceae. All three types of post-fire management operations appeared to hamper the recovery of resprouters and Leguminosae, whereas just tree harvesting and shrub clearance (but not soil tillage) negatively affected the cover of seeder species. These impacts of post-fire management operations had a noticeable region-specific component, being more relevant in the less productive biogeographic regions. Also the role of forest type depended strongly on biogeographic region. It was only significant in the South Mediterranean region, where pine plantations had a higher total shrub cover as well as higher covers of seeders and Cistaceae. Possibly, however, this significant role of forest type could be due to the lower incidence of shrub clearance in the pine standsinfo:eu-repo/semantics/publishedVersio

Modeling the individual height and volume of two integrated crop-livestock-forest systems of Eucalyptus spp. in the Brazilian Savannah.

The aim of this study was to model the individual height and volume of eucalyptus wood in two integrated crop-livestock-forest systems (ICLF1 and ICLF2) in Campo Grande, a city in the state of Mato Grosso do Sul, Brazil. Classic nonlinear growth models were adjusted for height (Logistic, Gompertz, Richards, Weibull, Van Bertalanffy, Brody, Mitscherlich, and Chapman and Richards) and volume (Shumacher-hall nonlinear, Takata, Honner, Logistic, Gompertz, and Weibull) in two structural arrangements: ICLF1, with a spacing of 14 x 2 m and density of 357 trees ha-1, and ICLF2, with a spacing of 22 x 2 m and density of 227 trees ha-1. Diameter at Breast Height (DBH) measurements were performed in 100% of trees, with measurements of the total height of some individuals and a rigorous scaling procedure in diameter classes. According to the calculated value of Student's t-test, there was no significant evidence that DBH and the average height of the trees were different between ICLF1 and ICLF2. Based on the Akaike information criterion (AIC), the corrected Akaike information criterion (AICC) and the Bayesian information criterion (BIC), the Richards model was selected to estimate heights and the Takata model was selected to estimate the volume

Sociology in Portugal: Local, national, and international dialogues

Although the institutionalisation of sociology in Portugal was only possible after the revolution of 1974, it is currently characterised by a remarkable vitality, noticeable for instance in the number and diversity of the members of the Portuguese Sociological Association (Associação Portuguesa de Sociologia), as well as the participants at its national conference. However, significant challenges have also emerged, not only resulting from the expansion and diversification of sociologists, but also from the economic crisis, the austerity policies, the growth of social sciences specialisations, and policies favouring business, law, health and engineering in research and the labour markets.info:eu-repo/semantics/acceptedVersio