1,945 research outputs found
Acessos de mandioca açucarada coletados no Nordeste paraense possuem o mesmo genótipo detectado por marcadores microssatélites.
A mandioca Ă© encontrada na regiĂŁo Norte do Brasil e Ă© usada como fonte de subsistĂŞncia para muitas famĂlias. A mandioca açucarada ou mandiocaba, Ă© um tipo de mandioca que armazena em suas raĂzes, alĂ©m do amido, açúcares livres como reservas. Atualmente, vĂŞm recebendo destaque pelo seu potencial para uso na fabricação de álcool combustĂvel, devido ao acĂşmulo de glicose que pode ser convertida em etanol diretamente. Foi realizado teste para avaliar a diversidade genĂ©tica de acessos de mandiocas açucaradas coletadas em diferentes locais do estado do Pará mantidos no banco de germoplasma da Embrapa AmazĂ´nia Oriental. Foi realizada a genotipagem molecular de nove acessos de mandioca açucarada e um acesso de mandioca brava com marcadores microssatĂ©lites. Para isso, foram utilizados 13 primers microssatĂ©lites e a corrida dos produtos amplificados foi realizada em gĂ©is de poliacrilamida 6%. ApĂłs a análise dos gĂ©is, foi verificado que todas as nove amostras de mandioca açucarada possuĂam o mesmo genĂłtipo, sendo verificada baixa variabilidade genĂ©tica para esse grupo de mandiocas
Modeling Energy Communities with Collective Photovoltaic Self-Consumption: Synergies between a Small City and a Winery in Portugal
The recently approved regulation on Energy Communities in Europe is paving the way for
new collective forms of energy consumption and production, mainly based on photovoltaics. However,
energy modeling approaches that can adequately evaluate the impact of these new regulations
on energy community configurations are still lacking, particularly with regards to the grid tariffs
imposed on collective systems. Thus, the present work models three different energy community
configurations sustained on collective photovoltaics self-consumption for a small city in southern
Portugal. This energy community, which integrates the city consumers and a local winery, was
modeled using the Python-based Calliope framework. Using real electricity demand data from
power transformers and an actual winery, the techno-economic feasibility of each configuration
was assessed. Results show that all collective arrangements can promote a higher penetration of
photovoltaic capacity (up to 23%) and a modest reduction in the overall cost of electricity (up to 8%).
However, there are clear trade-offs between the different pathways: more centralized configurations
have 53% lower installation costs but are more sensitive to grid use costs (which can represent up to
74% of the total system costs). Moreover, key actor’s individual self-consumption rate may decrease
by 10% in order to benefit the energy community as a whole.info:eu-repo/semantics/publishedVersio
Location of R&D activities by vertical multinationals over asymmetric countries
This paper deals with the location of R&D by vertical multinational firms. By taking the colocation of laboratories and productive plants as a benchmark, we can see that the spatial separation of both emerges under two conditions – high intensity of R&D spillovers and strong size asymmetry between countries. The latter condition is effective since it is related with a rising international inequality of wages. If the spatial separation of R&D and manufacturing takes place, headquarters services (namely R&D units) will be likely located in the smaller country. The converse pattern, where laboratories are place in the larger country, may arise if production is high-tech and the localized externalities of research activity are strong. Hence, this article confirms the main results of the literature on this topic but in the context of a different framework which allows us to tackle two usually disregarded topics: the transfer cost of technology; and the direct engagement of industrial workers in R&D spillovers. These aspects are dealt with by presupposing that, in addition to a “technological” externality among researchers, there is an “educational” externality exerted by researchers upon neighbouring industrial workers. When a country loses its laboratories, the inhabitants become intellectually “impoverished” and their labour starts to have a lesser efficiency.info:eu-repo/semantics/publishedVersio
Item response theory analysis of the recoded Internet Gaming Disorder Scale-Short-Form (IGDS9-SF)
Based on the nine criteria for Internet gaming disorder (IGD) in DSM-5, the Internet Gaming Disorder Scale 9-Short Form (IGDS9-SF; Pontes and Griffiths 2015) is the most widely used questionnaire for assessing IGD. The present study examined support for the unidimensional factor structure of the instrument, with a group of 868 adolescent and adult gamers from the USA, with criteria recoded as present or absent. The two-parameter logistic model (2PLM) was used to examine the item response theory properties of the criteria included in the measure. Confirmatory factor analysis supported the one-factor model. The 2PLM analysis indicated that all the criteria were strong discriminators of high and low latent IGD. Furthermore, the items measured more of the GAD dimension and with more precision from around +2 SD from the mean trait level. The implications of the findings for interpreting the IGDS9-SF scores for clinical practice are discussed
An overview of COVID-19 infection in dental practices - a questionnaire survey
Dental nurses and practitioners are at high risk of exposure to COVID-19 due to physical proximity and exposure to body fluids during treatment. Dental practices have implemented multiple protective protocols to decrease COVID-19 transmission; however, it is difficult to evaluate how effective these measures are, as there is limited data on COVID-19 in dental practices. To evaluate COVID-19 infection rates among dentists, dental staff, and patients in different countries through an online survey, with a primary focus on South Africa (SA). Cross-sectional online survey. One hundred fifty-four participants from 52 countries answered the survey, 48.6% (n=561) from SA. COVID-19 infections were reported in 18.2% (n=210) of dental practices. Only 1.1% regarded the practice as the source of infection for dentists and staff who got infected. In total, 13.9% (n=160) treated COVID-19 patients. SA presented a higher infection rate (19% vs 13%, p=0.04) and more frequent treatment of COVID-19 patients than the other countries combined (17% vs 11%, p=0.006). These findings support the need to maintain strict infection control measures to decrease transmission of SARSCoV-2 during the delivery of oral care
Microinjection molding of polyamide 6/carbon nanotube composites
Microinjection molding of polymer composites with carbon nanotubes (CNT) requires previous production of the nanocomposites, often by melt extrusion. Each processing step has a thermo-mechanical effect on the polymer melt, conveying different properties to the final product. In this work, polyamide 6 and its composites with pristine and functionalized CNT (f-CNT) were processed by a mini twin-screw extrusion, followed by microinjection molding. The morphology induced on the polymer by each process was analyzed by differential scanning calorimetry and wide angle X-ray diffraction. Calorimetric analysis showed a secondary crystallization for the microinjected materials, absent for the extruded materials. The characterization of microinjected polyamide 6 by X-ray diffraction revealed a large contribution of the c phase to the total crystallinity, mainly in the skin region, while the nanocomposites and extruded materials were characterized by a larger contribution of the a phase. Functionalization of CNT did not affect significantly the polymer morphology compared to composites with pristine CNT.The authors acknowledge Fundacao para a Ciencia e Tecnologia for project PEst-C/CTM/LA0025/2013 (Strategic Project - LA 25 - 2013-2014), and for PhD grant for T. Ferreira (SFRH/BD/39119/2007). We acknowledge University of Aveiro, Department of Chemistry/CICECO for the use of the X-ray equipment, in particular Dr Paula Brandao, for helping on the X-ray measurements
LATE TRAUMATIC BIRTH COMPLICATION
Introdução: A necrose gorda do tecido subcutâneo (NGTS) Ă© uma patologia transitĂłria rara do tecido adiposo, que afeta sobretudo recĂ©m-nascidos de termo ou pĂłs-termo com um perĂodo perinatal complicado.
Caso clĂnico: RecĂ©m-nascido de termo, grande para a idade gestacional, nascido por parto vaginal complicado, com necessidade de reanimação. Aos 13 dias de vida surgiram lesões cutâneas compatĂveis com NGTS, que resolveram sem complicações.
Discussão: Relatamos um caso de NGTS que apresentou uma evolução benigna, para relembrarmos esta entidade incomum. A patogenia é mal compreendida e, embora geralmente resolva espontaneamente, pode complicar-se de hipercalcemia condicionando uma evolução desfavorável
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