Abstract Musculoskeletal symptoms (MS) can derive from injuries or dysfunctions that affect biological tissues such as muscles, bones, and nerves, among others. Military Firefighters (MF) exercise their activities exposed to varied and complex biological conditions, in which the physical demands are intense. Shift work is another remarkable characteristic of the career, which is associated with sleep disorders. Our objective was to estimate the association between the risk of chronification of MS and sleep quality in MF with MS. Our study is a Cross-Sectional Observational Study, whose sample was composed of 753 BM from the Federal District. The analysis was performed with a Sample Characterization Questionnaire, Örebro Musculoskeletal Symptoms Screening Questionnaire (OMPSQ) and the Pittsburgh Sleep Quality Index (PSQI), answered remotely. Statistical analysis used the Spearman Correlation test, p<0.05. The correlation between OMPSQ and PSQI was rated moderate, demonstrating that sleep quality has an influence on the chronification process. The average of the evaluation of Sleep Quality through the PSQI is 8.79, indicating that military personnel present a deficient quality of sleep. There was a correlation between the PSQI score and the OMPSQ of 0.542 (p<0.001), a moderate correlation between the variables. We conclude that MF show correlation between SM and sleep quality, indicating a moderate relationship between the variables, where sleep quality explains 25% of SM. We found that most MF were classified as Low Risk for chronification of SM.

Resumo Os sintomas musculoesqueléticos (SM) podem derivar de lesões ou disfunções que afetam tecidos biológicos como músculos, ossos, nervos, entre outros. Os Bombeiros Militares (BM) exercem suas atividades expostos a condições biológicas variadas e complexas, nas quais as demandas físicas são intensas. O trabalho em turno é outra característica marcante na carreira, o qual está associado a distúrbios do sono. Nosso objetivo foi estimar a associação entre o risco de cronificação de SM e a qualidade do sono em BM com SM. Nosso estudo é um Estudo Observacional Transversal, cuja amostra foi composta por 753 BM do Distrito Federal. A análise foi realizada com um Questionário de Caracterização Amostral, Questionário Örebro de Triagem de Sintomas Musculoesqueléticos (OMPSQ) e com o Índice de Qualidade do Sono de Pittsburgh (PSQI), respondidos remotamente. A análise estatística utilizou o teste de Correlação Spearman, p<0,05. A correlação entre OMPSQ e PSQI foi classificada em moderada, demonstrando que a qualidade do sono apresenta influência no processo de cronificação. A média da avaliação da Qualidade do Sono através do PSQI é de 8,79, indicando que militares apresentam uma qualidade do sono deficitária. Houve correlação entre a pontuação no PSQI e o OMPSQ de 0,542 (p<0.001), correlação moderada entre as variáveis. Concluímos que os BM apresentam correlação entre os SM e a qualidade do sono, indicando uma relação moderada entre as variáveis, onde a qualidade de sono explica 25% dos SM. Verificamos que a maioria dos BM foram classificados como Baixo Risco de cronificação de SM.

RESUMO No presente trabalho foram estudados os grãos de pólen de 11 espécies pertencentes à família Urticaceae (Boehmeria cylindrica (L.) Sw., Cecropia glaziovii (Snethl), C. hololeuca (Miq), C. pachystachya Trécul, Coussapoa microcarpa ( Shott) Rizzini, Laportea aestuans (L.) Chew, Phenax sonneratti (Poir.) Wedd., Pilea microphylla (L.) Liebm., Urera baccifera (L.) Gaudich. ex Wedd., U. caracasana (Jacq.) Griseb., U. nitida (Vell.) Brack). Para todos os táxons estudados, são apresentadas descrições, ilustrações e observações.

ABSTRACT Pollen grain morphology of 11 species of Urticaceae was studied Boehmeria cylindrica (L.) Sw., Cecropia glaziovii (Snethl), C. hololeuca (Miq), C. pachystachya Trécul, Coussapoa microcarpa ( Shott ) Rizzini, Laportea aestuans (L.) Chew, Phenax sonneratti (Poir.) Wedd., Pilea microphylla (L.) Liebm., Urera baccifera (L.) Gaudich. ex Wedd., U. caracasana (Jacq.) Griseb., U. nitida (Vell.) Brack. Pollen grains descriptions, illustrations, and observations are presented for all studied taxa.

The current work evaluated the microstructures and martensitic transformation temperatures of NiTi shape memory alloy (SMA) deformed by equal channel angular extrusion (ECAE). The Ti-55.27wt.%Ni alloy was processed by 1 ECAE pass at 250 °C using a die with an intersection angle of 120°. After processing, samples were annealed at 300 °C, 400 °C and 500 °C for 1h to evaluate the microstructural changes. Microstructural characterization was performed by scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDS) device, and Vickers hardness measurement. Martensitic transformations temperatures were analyzed by differential scanning calorimetry (DSC). Results show that the annealing treatments presented no significant change in the microstructure of the ECAE processed samples. Meanwhile, the DSC curves corresponding to the annealing treatments performed at 300 °C and 400 °C show two step martensitic transformation related to B2→R→B19'. For the annealing at 500 °C, the martensitic transformation temperatures returned to the ST condition, indicating a reduction of the processing defects.

Porous 316L austenitic stainless steel was synthesized by powder metallurgy with relative density of 0.50 and 0.30 using 15 and 30 wt. (%) respectively of ammonium carbonate and ammonium bicarbonate as foaming agents. The powders were mixed in a planetary ball mill at 60 rpm for 10 minutes. The samples were uniaxially pressed at 287 MPa and subsequently vacuum heat treated in two stages, the first one at 200 ºC for 5 hours to decompose the carbonate and the second one at 1150 ºC for 2 hours to sinter the steel. The sintered samples had a close porous structure and a multimodal pore size distribution that varied with the foaming agent and its concentration. The samples obtained by addition of 30 wt. (%) of foaming agents had a more homogeneous porous structure than that obtained with 15 wt. (%). The MTT cytotoxicity test (3-[4,5-dimethylthiazol]-2,5-diphenyltetrazolium bromide) was used to evaluate the mitochondrial activity of L929 cells with samples for periods of 24, 48, and 72 hours. The cytotoxicity test showed that the steel foams were not toxic to fibroblast culture. The sample with the best cellular growth, therefore the most suitable for biomedical applications among those studied in this work, was produced with 30 wt. (%) ammonium carbonate. In this sample, cell development was observed after 48 hours of incubation, and there was adhesion and spreading on the material after 72 hours. Electrochemical experiments using a chloride-containing medium were performed on steel foams and compared to massive steel. The massive steel had a better corrosion performance than the foams as the porosity contributes to increase the surface area exposed to the corrosive medium.