60 research outputs found

    The combined use of cross-section analysis and other stratigraphic recording systems in the cleaning of two panel paintings from the fifteenth- and sixteenth-century

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    Cross sections are frequently used in the stratigraphic study of pictorial structures. Thanks to cross sections, it is possible to study and record original and non-original strata that may provide important information regarding the artist's technique and later restoration processes. This information helps conservators design different strategies in processes such as cleaning. However, it is often in cleaning where the advantages and limitations of cross sections become obvious. When dealing with a complex structure, cross sections may not be enough to record in a comprehensive and accurate manner all the strata removed during cleaning. In some cases, the conservator may obtain during cleaning a great amount of stratigraphic information that is not visible in the cross sections. Therefore, it may be necessary to resort to other recording systems, such as the stratigraphic unit recording sheet and the stratigraphic diagram, which are frequently used in archaeological stratigraphy. This article demonstrates how cross-section analysis was combined with stratigraphic study during the cleaning of two panel paintings to gain an improved understanding of their complicated layer structure.Barros García, JM.; Reina De La Torre, A.; Pérez Marín, E. (2014). The combined use of cross-section analysis and other stratigraphic recording systems in the cleaning of two panel paintings from the fifteenth- and sixteenth-century. Studies in Conservation. 60(4):245-252. doi:10.1179/2047058414Y.0000000128S24525260

    The effect of chair massage on muscular discomfort in cardiac sonographers: a pilot study

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    <p>Abstract</p> <p>Background</p> <p>Cardiac sonographers frequently have work-related muscular discomfort. We aimed to assess the feasibility of having sonographers receive massages during working hours in an area adjacent to an echocardiography laboratory and to assess relief of discomfort with use of the massages with or without stretching exercises.</p> <p>Methods</p> <p>A group of 45 full-time sonographers was randomly assigned to receive weekly 30-minute massage sessions, massages plus stretching exercises to be performed twice a day, or no intervention. Outcome measures were scores of the <it>Quick</it>DASH instrument and its associated work module at baseline and at 10 weeks of intervention. Data were analyzed with standard descriptive statistics and the separation test for early-phase comparative trials.</p> <p>Results</p> <p>Forty-four participants completed the study: 15 in the control group, 14 in the massage group, and 15 in the massage plus stretches group. Some improvement was seen in work-related discomfort by the <it>Quick</it>DASH scores and work module scores in the 2 intervention groups. The separation test showed separation in favor of the 2 interventions.</p> <p>Conclusion</p> <p>On the basis of the results of this pilot study, larger trials are warranted to evaluate the effect of massages with or without stretching on work-related discomfort in cardiac sonographers.</p> <p>Trial Registration</p> <p>NCT00975026 ClinicalTrials.gov</p

    Biodiversidade da fauna do solo e sua contribuição para os serviços ambientais.

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    A fauna do solo inclui organismos microscópicos, como os nematóides, ácaros e colêmbolos, até os facilmente visíveis, como as minhocas, aranhas, formigas, cupins e besouros, cuja biodiversidade mundial ultrapassa 900 mil espécies conhecidas. Para viver no solo e na serapilheira desenvolveram diversas adaptações comportamentais e morfológicas, e podem ser classificados em quatro grandes grupos funcionais: predadores/parasitas, detritívoros/decompositores, geófagos/ bioturbadores e fitófagos/pragas. Portanto, sua atividade está relacionada a diversos serviços ambientais, incluindo: a produção de alimentos e a produtividade primária; produtos farmacêuticos; ciclagem de nutrientes e a dinâmica da decomposição da matéria orgânica, inclusive o sequestro de carbono; a água disponível no solo; a troca de gases entre o solo e a atmosfera; a pedogênese; a conservação da biodiversidade; o controle de erosão e enchentes; a polinização; a dispersão de sementes; o tratamento de resíduos; a recreação e a educação ambiental. Contudo, o cálculo da contribuição da fauna a esses serviços e sua valoração econômica continuam representando grandes desafios para os cientistas naturais e economistas. As práticas de manejo e os sistemas de uso do solo podem afetar profundamente as populações e a atividade da fauna edáfica. Portanto, para aproveitar melhor os benefícios oriundos dos processos ecossistêmicos e serviços ambientais influenciados pela fauna edáfica é essencial considerar o manejo que preserve suas populações e atividade nos solos, especialmente em sistemas produtivos. Nesse contexto, mostramos quais organismos representam a fauna edáfica, os fatores de manejo do solo que afetam suas populações e explicamos como a atividade desses organismos contribui para os serviços ambientais.Capítulo 10
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