Objective: To report on suicide plans and attempts among Brazilian physicians and to investigate the associated risk factors. Methods: From January 2018 to January 2019, a nationwide online survey was conducted among Brazilian physicians using the Tool for Assessment of Suicide Risk and the Satisfaction with Life Scale. Multivariate exploratory associations of demographic, psychological, and work-related factors were performed on reports of suicide plans and attempts. Results: Of the 4,148 participants, 1,946 (53.5%) were male, 2,527 (60.9%) were 30 to 60 years old, 2,675 (64.5%) had two to four jobs, and 1,725 (41.6%) worked 40 to 60 hours a week. The overall prevalence of suicide plans was 8.8% (n=364), and suicide attempts were reported by 3.2% (n=133) of participants. Daily emotional exhaustion (ORadj = 7.857; 95%CI 2.282-27.051, p = 0.002), weekly emotional exhaustion (ORadj = 7.953; 95%CI 2.403-26.324, p = 0.001), daily frustration at work (ORadj = 3.093; 95%CI 1.711-5.588, p < 0.001), and bisexuality (ORadj = 5.083; 95%CI 2.544-10.158, p < 0.001) were significantly associated with higher odds of suicide. Extremely dissatisfied physicians reported suicide plans and attempts in 38.3% of cases, whereas extremely satisfied physicians reported suicide plans and attempts in only 2.8% of cases (p < 0.001). Conclusion: Brazilian physicians with a history of suicide plans and attempts express emotional exhaustion and frustration at work. There is an urgent need for actions to promote professional safeguards and resilience. Objective Methods 201 2019 Scale demographic psychological workrelated related Results 4148 4 148 4,14 participants 1946 1 946 1,94 53.5% 535 53 5 (53.5% male 2527 2 527 2,52 60.9% 609 9 (60.9% 3 6 old 2675 675 2,67 64.5% 645 64 (64.5% jobs 1725 725 1,72 41.6% 416 41 (41.6% week 88 8 8.8 n=364, n364 n n=364 , 364 (n=364) 32 3.2 n=133 n133 133 (n=133 ORadj 7.857 7857 7 857 95CI CI 95 2.28227.051, 228227051 2.282 27.051, 282 27 051 2.282-27.051 0.002, 0002 0.002 0 002 0.002) 7.953 7953 953 2.40326.324, 240326324 2.403 26.324, 403 26 324 2.403-26.324 0.001, 0001 0.001 001 3.093 3093 093 1.7115.588, 17115588 1.711 5.588, 711 588 1.711-5.588 5.083 5083 083 2.54410.158, 254410158 2.544 10.158, 544 10 158 2.544-10.158 383 38 38.3 28 2.8 0.001. . Conclusion resilience 20 414 14 4,1 194 94 1,9 53.5 (53.5 252 52 2,5 60.9 (60.9 267 67 2,6 64.5 (64.5 172 72 1,7 41.6 (41.6 8. n36 n=36 36 (n=364 3. n=13 n13 13 (n=13 7.85 785 85 28227 2.28227.051 22822705 2282 2.28 27051 27.051 05 2.282-27.05 000 0.00 00 7.95 795 40326 2.40326.324 24032632 2403 2.40 26324 26.324 2.403-26.32 3.09 309 09 7115 1.7115.588 1711558 1711 1.71 5588 5.588 71 58 1.711-5.58 5.08 508 08 54410 2.54410.158 25441015 2544 2.54 10158 10.158 54 15 2.544-10.15 38. 2. 4, 19 1, 53. (53. 25 2, 60. (60. 64. (64. 17 41. (41. n3 n=3 (n=36 n=1 n1 (n=1 7.8 78 2822 2.28227.05 2282270 228 2.2 2705 27.05 2.282-27.0 0.0 7.9 79 4032 2.40326.32 2403263 240 2.4 2632 26.32 2.403-26.3 3.0 1.7115.58 171155 171 1.7 558 5.58 1.711-5.5 5.0 50 5441 2.54410.15 2544101 254 2.5 1015 10.15 2.544-10.1 (53 (60 (64 (41 n= (n=3 (n= 7. 2.28227.0 228227 22 270 27.0 2.282-27. 0. 2.40326.3 240326 24 263 26.3 2.403-26. 1.7115.5 17115 1. 55 5.5 1.711-5. 5. 2.54410.1 254410 101 10.1 2.544-10. (5 (6 (4 (n 2.28227. 22822 27. 2.282-27 2.40326. 24032 26. 2.403-26 1.7115. 1.711-5 2.54410. 25441 10. 2.544-10 ( 2.28227 2.282-2 2.40326 2.403-2 1.7115 1.711- 2.54410 2.544-1 2.2822 2.282- 2.4032 2.403- 2.5441 2.544-

ABSTRACT Objective Currently programmed cell death protein 1 (PD-1) inhibitors in combination with other therapies are being evaluated to determine their efficacy in cancer treatment. However, the effect of PD-ligand (L) 1 expression on disease outcomes in stage III (EC III) non-small cell lung cancer is not completely understood. Therefore, this study aimed to assess the influence of PD-L1 expression on the outcomes of EC III non-small cell lung cancer. Methods This study was conducted on patients diagnosed with EC III non-small cell lung cancer who underwent treatment at a tertiary care hospital. PD-L1 expression was determined using immunohistochemical staining, all patients expressed PD-L1. Survival was estimated using the Kaplan-Meier method. Relationships between variables were assessed using Cox proportional regression models. Results A total of 49 patients (median age=69 years) with EC III non-small cell lung cancer and PD-L1 expression were evaluated. More than half of the patients were men, and most were regular smokers. The patients were treated with neoadjuvant chemotherapy, surgery, or sequential or combined chemotherapy and radiotherapy. The median progression-free survival of the entire cohort was 14.2 months, and the median overall survival was 20 months. There was no significant association between PD-L1 expression and disease progression, clinical characteristics, or overall survival. Conclusions PD-L1 expression was not correlated with EC III non-small cell lung cancer outcomes. Whether these findings differ from the association with immune checkpoint inhibitors remains to be addressed in future studies. PD1 PD (PD-1 However PDligand ligand L (L nonsmall non small understood Therefore PDL1 PDL L1 PD-L hospital staining PDL1. L1. KaplanMeier Kaplan Meier method models 4 age69 age 69 age=6 years men smokers surgery radiotherapy progressionfree progression free 142 14 2 14. months characteristics studies (PD- age6 6 age= (PD

Resumo Nas últimas três décadas, o tratamento do AVC sofreu transformações significativas, impulsionadas principalmente pela introdução das terapias de reperfusão e pela organização dos serviços de AVC. Os pacientes que recebem tratamento em um serviço de AVC bem estruturado têm uma probabilidade muito maior de resultados favoráveis, diminuindo assim a incapacidade funcional e a mortalidade. Neste artigo, revisamos as evidências científicas para as terapias de reperfusão do AVC, incluindo trombólise e trombectomia e sua implementação no sistema público de saúde no Brasil. décadas significativas favoráveis mortalidade artigo Brasil

Abstract Over the last three decades, stroke care has undergone significant transformations mainly driven by the introduction of reperfusion therapy and the organization of systems of care. Patients receiving treatment through a well-structured stroke service have a much higher chance of favorable outcomes, thereby decreasing both disability and mortality. In this article, we reviewed the scientific evidence for stroke reperfusion therapy, including thrombolysis and thrombectomy, and its implementation in the public health system in Brazil. decades wellstructured well structured outcomes mortality article thrombectomy Brazil

Resumo Objetivo Analisar os níveis séricos de TNF-alfa e de seus receptores TNF-R1 e TNF-R2 no sangue de pacientes com fraturas de baixo impacto, decorrentes de osteoporose, comparando entre os sexos e com pacientes saudáveis. Métodos Oestudofoi realizadocom amostradesanguede 62 pacientes,divididos em pacientes com osteoporose e pacientes saudáveis. Os resultados foram obtidos através do método de ELISA. As concentrações de citocinas foram determinadas com base nos valores de absorbância obtidos. Resultados Os níveis séricos de TNF-alfa foram indetectáveis nos pacientes do sexo feminino, enquanto no masculino encontrou-se somente em um paciente, não havendo diferença significativa. Encontrou-se resultados semelhantes nas análises dos níveis de TNF-R1 e TNF-R2, aumento significativo nos níveis dos receptores de TNF-alfa nos grupos de pacientes com osteoporose em comparação com o grupo controle, em ambos os sexos. Não houve diferença significativa entre os sexos na dosagem de ambos os receptores dentro do grupo com osteoporose. Houve ainda correlação positiva e significativa nos níveis de TNF-R1 e TNF-R2 apenas nas mulheres. Conclusão O aumento significativo nos níveis de TNF-R1 e TNF-R2 em mulheres com osteoporose sugerem que a liberação e expressão destes receptores pode estar contribuindo de maneira distinta no desenvolvimento da osteoporose em homens e mulheres. TNFalfa TNF alfa TNFR1 TNFR R1 R TNF-R TNFR2 R2 impacto saudáveis 6 pacientesdivididos divididos ELISA feminino encontrouse encontrou se paciente Encontrouse Encontrou TNFR2, R2, controle

Abstract Objective To analyze the serum levels of TNF-alpha and its TNF-R1 and TNF-R2 receptors in the blood of patients with low-impact fractures due to osteoporosis, comparing between genders and with healthy patients. Methods The present study was conducted with a blood sample of 62 patients, divided into patients with osteoporosis and healthy patients. The results were obtained using the ELISA method. Cytokine concentrations were determined based on the absorbance values obtained. Results Serum TNF-alpha levels were undetectable in female patients, while in males they were found only in one patient, with no significant difference. Similar results were found in the analyses of TNF-R1 and TNF-R2 levels, a significant increase in levels of TNF-alpha receptors in the groups of patients with osteoporosis compared with the control groupinbothsexes.There wasnosignificant difference between the sexes in the dosage of both receptors within the group with osteoporosis. There was also a positive and significant correlation in the levels of TNF-R1 and TNF-R2 only in women. Conclusion The significant increase in TNF-R1 and TNF-R2 levels in women with osteoporosis suggest that the release and expression of these receptors may be contributing differently to the development of osteoporosis in men and women. TNFalpha TNF alpha TNFR1 TNFR R1 R TNF-R TNFR2 R2 lowimpact low impact 6 method patient groupinbothsexesThere groupinbothsexes

Abstract In this case study of a soil nail retaining wall, the measured horizontal displacement is of the order of 0.023% H, where H is the excavation depth, while the two-dimensional Finite Element Method (FEM) analysis suggests horizontal displacements of the order of at least 0.5% H. This study aims to understand which parameters influence such displacements through a Sensitivity Analysis. In addition, the study compares results obtained through two-dimensional and three-dimensional FEM analyses for this case. It concludes that Young's Modulus (E) and the in-situ earth pressure coefficient (K0) are the two parameters that most influence such displacements. This study shows that Mohr Coulomb's perfectly plastic Elastic Constitutive Model is unsuitable for simulating this structure, which had minimal displacements in situ, suggesting the Hardening Soil model (Schanz et al., 1999) as a viable alternative. Compared to 3D analysis, 2D analysis showed significantly larger horizontal displacements. This led to the conclusion that 2D analysis in MEF is unsuitable for predicting lateral displacements unless a Reduction Factor (FR) ranging from 0.4 to 1.0 was applied. wall 0023 0 023 0.023 depth twodimensional dimensional (FEM 05 5 0.5 Analysis addition threedimensional three Youngs Young s E (E insitu situ K0 K (K0 Coulombs Coulomb structure Schanz al al. 1999 alternative D FR (FR 04 4 0. 10 1 1. applied 002 02 0.02 (K 199 00 0.0 19

ABSTRACT Background: Non-metastatic castration resistant prostate cancer (M0 CRPC) has seen important developments in drugs and diagnostic tools in the last two years. New hormonal agents have demonstrated improvement in metastasis free survival in M0 CRPC patients and have been approved by regulatory agencies in Brazil. Additionally, newer and more sensitive imaging tools are able to detect metastasis earlier than before, which will impact the percentage of patients staged as M0 CRPC. Based on the available international guidelines, a group of Brazilian urology and medical oncology experts developed and completed a survey on the diagnosis and treatment of M0 CRPC in Brazil. These results are reviewed and summarized and associated recommendations are provided. Objective: To present survey results on management of M0 CRPC in Brazil. Design, setting, and participants: A panel of six Brazilian prostate cancer experts determined 64 questions concerning the main areas of interest: 1) staging tools, 2) treatments, 3) side effects of systemic treatment/s, and 4) osteoclast-targeted therapy. A larger panel of 28 Brazilian prostate cancer experts answered these questions in order to create country-specific recommendations discussed in this manuscript. Outcome measurements and statistical analysis: The panel voted publicly but anonymously on the predefined questions. These answers are the panelists' opinions, not a literature review or meta-analysis. Therapies not yet approved in Brazil were excluded from answer options. Each question had five to seven relevant answers including two non-answers. Results were tabulated in real time. Conclusions: The results and recommendations presented can be used by Brazilian physicians to support the management of M0 CRPC patients. Individual clinical decision making should be supported by available data, however, for Brazil, guidelines for diagnosis and management of M0 CRPC patients have not been developed. This document will serve as a point of reference when confronting this disease stage.

RESUMO O projeto objetiva abordar a obra educacional de Condorcet a partir de dois problemas. O primeiro é a relação entre os princípios educacionais do autor, como: liberdade, laicidade, gratuidade e universalidade de ensino. O segundo é a comparação entre as suas duas obras: Cinco Memórias Sobre a Instrução Pública e Instrução Pública e Organização do Ensino, tendo em vista analisar semelhanças e diferenças entre ambas. Buscamos a comparação entre as obras devido à dissonância na literatura sobre o tema, pois, enquanto Cahen afirma que não há qualquer diferença substancial entre as duas obras, Albertone destaca que, em uma compração entre as duas obras, o Projeto parece ter maior sensibilidade social do que as Memórias, demonstrando, assim, uma descontinuidade entre as obras.

ABSTRACT The project aims to address the educational work of Condorcet from two problems. The first is the relationship between the educational principles of the author, such as freedom, secularism, gratuity and universality of teaching. The second is the comparison between his two works: Cinco Memórias Sobre a Instrução Pública and Instrução Pública e Organização do Ensino, in order to analyze similarities and differences between the two. We seek to compare those works because of the dissonance in the literature on the subject, for while Cahen states that there is no substantial difference between the two works, Albertone highlights that, in a comparison between the two works, the Project seems to have greater social sensitivity than the Memoirs, thus demonstrating a discontinuity between the works.

RESUMEN El objetivo del proyecto es abordar la obra educativa de Condorcet desde dos problemas. El primero es la relación entre los principios educativos del autor, como: libertad, laicidad, gratuidad y universalidad de la enseñanza. El segundo es la comparación entre sus dos obras: Cinco Memórias Sobre a Instrução Pública e Instrução Pública e Organização do Ensino, con el fin de analizar las similitudes y diferencias entre ambas. Se busca comparar las obras respecto la disonancia en la literatura sobre el tema, pues, ya que mientras Cahen afirma no haber ninguna diferencia sustancial entre las dos obras, Albertone destaca que, en una comparación entre las dos obras, el Proyecto parece tener una mayor sensibilidad social que las Memorias, demostrando aí una discontinuidad entre las obras.

Resumo Um dos principais métodos para estudo de anatomia das plantas é a análise de cortes finos e transparentes, submetidos à coloração. Corantes sintéticos tradicionalmente utilizados em estudos anatômicos podem ser caros e produzidos por empresas específicas. O uso alternativo de corantes têxteis industriais, pode representar tanto uma substituição acessível economicamente quanto uma opção ecologicamente viável de uso desses corantes. Neste estudo foram avaliados 22 tipos de corantes têxteis. Cortes transversais, longitudinais e paradérmicos de órgãos de plantas, obtidos pela técnica de corte à mão livre foram submetidos às soluções hidroalcoólicas (0 a 100%) de corantes têxteis adquiridos em mercados locais. A solução hidroalcoólica a 50% dos corantes mostrou maior eficiência no contraste dos tecidos, maior solubilidade do pó corante e melhor interação das soluções com os tecidos vegetais. A maioria dos corantes testados mostraram resultados satisfatórios. A parede celular, especialmente a lignificada, mostrou maior eficiência de coloração. Análises de ancoragem molecular utilizando modelos de celulose e lignina mostraram os prováveis mecanismos de associação e seletividade dos corantes com os componentes da parede celular. A abordagem aqui realizada pode ser útil em aulas práticas conjugadas de anatomia vegetal, química e / ou bioquímica, tanto no ensino médio quanto no nível de graduação.

Abstract One of the main methods for plant anatomy study is the analysis of thin, transparent, and stained tissue sections. Synthetic dyes traditionally used in anatomical studies might be expensive and produced by specific companies. In contrast, the use of alternative industrial dyes can both represent an inexpensive substitute as well as an environmentally friendly option for conducting plant anatomy studies. In this study, a set of 22 textile dyes was evaluated. Transversal-, longitudinal, and paradermal sections of plant organs obtained using the freehand cutting technique were stained using hydroalcoholic solution (0 to 100%) of textile dyes purchased from a local market. Dyes mixed with 50% hydroalcoholic solution showed higher efficiency in tissue contrast, allowing greater solubility of dye powder and better solution interaction with the plant tissues. Most of the tested dyes showed satisfactory staining results. Cell wall, especially lignified one, showed higher staining efficiency. Computational docking analysis and molecular models of cellulose and lignin showed the probable association mechanisms and dye selectivity to cell wall constituents. Our findings suggest that the developed method can be useful in mixed practical classes of plant anatomy, chemistry, and/or biochemistry, both at high school as well as undergraduate levels.

Resumo: Introdução: A Faculdade de Medicina da Universidade Federal de Goiás (FM-UFG) iniciou um novo processo de mudança curricular em 2014. As disciplinas de Semiologia I e II passaram a adotar metodologias ativas de ensino para adequação às necessidades da reforma curricular. O objetivo deste artigo foi avaliar a percepção dos discentes do primeiro ano da FM-UFG sobre o ambiente educacional das disciplinas de Semiologia I e II. Método: Trata-se de um estudo descritivo, do tipo corte transversal, envolvendo 86 alunos. O instrumento de coleta de dados foi o questionário Dundee Ready Education Environment Measure (Dreem), versão em português. Os resultados foram considerados em três níveis: questões individuais, cinco dimensões e Dreem global. Calcularam-se a média, o desvio padrão e os respectivos intervalos de confiança de 95%. Obteve-se a confiabilidade interna do Dreem pelo cálculo do alfa de Cronbach, avaliou-se a distribuição dos dados da amostra pelo teste de Shapiro-Wilk e realizou-se a comparação entre os percentuais da média dos escores dos domínios e do DRREM global pela ANOVA, seguida do teste de Tukey. Resultados: A média do Dreem global foi de 134,83/200 ± 17,42, uma percepção mais positiva que negativa. As cinco dimensões tiveram os seguintes resultados: percepção da aprendizagem (32,74 / 48 ± 5,59 / uma visão mais positiva); percepção dos docentes (32,71 / 44 ± 6,23 / na direção certa); percepção dos resultados acadêmicos (20,22 / 32 ± 4,09 / sentimento positivo); percepção do ambiente geral (31,74 / 48 ± 5,69 / atitude positiva); percepção das relações sociais (17,42 / 28 ± 3,83 / não é tão ruim). Foram encontrados alguns pontos problemáticos em relação a fatos memorizáveis, metodologia de ensino prévio e cansaço para cursarem a disciplina. A dimensão com mais áreas fortes foi a percepção dos docentes. Houve significância estatística quando os percentuais da média dos escores dos domínios e do Dreem global foram comparados. Conclusão: O ambiente educacional das disciplinas de Semiologia I e II da Faculdade de Medicina da UFG criado pelas inovações metodológicas foi avaliado positivamente pelos discentes participantes, com destaque para o domínio percepção dos docentes.

Abstract: Introduction: In 2014, the Medical School of the Federal University of Goias (FM-UFG) started its curricular changing process. The disciplines of Semiology I and II started to use active teaching methodologies to fit the curricular reform needs. The objective of this article was to evaluate the FM-UFG students’ perception of the Educational Environment in the disciplines of Semiology I and II. Method: This is a descriptive, cross-sectional study encompassing 86 students. The data collection tool was the Dundee Ready Education Environment Measure (DREEM) questionnaire, in its Portuguese version. Results were considered at three levels: individual questions, five domains and global DREEM. Mean values, standard deviation and respective 95% confidence intervals were calculated. The internal reliability of the DREEM was determined using Cronbach’s alpha; the sample normality was determined using the Shapiro-Wilk test; and the comparison between the mean score percentages of the domains and of the global DREEM was performed by ANOVA ,followed by Tukey’s test. Results: The global DREEM mean was 134.83 / 200 ± 17.42, a more positive than negative perception. The five domains showed the following results: Students’ Perception of Learning - SPL (32.74 / 48 ± 5.59 / a more positive approach); Students’ Perception of Teachers - SPT (32.71 / 44 ± 6.23 / going in the right direction); Students’ Academic Self-Perception - SASP: (20.22 / 32 ± 4.09 / feeling more on the positive side); Students’ Perception of the Atmosphere - SPA (31.74 / 48 ± 5.69 / a more positive attitude); Students’ Social Self-Perception - SSSP: (17.42 / 28 ± 3.83 / not too bad). Some issues were found in relation to: memorizable facts; previous teaching methodology; and, fatigue to attend the discipline. The SPT was the domain with the largest number of strong areas. Statistical significance was found when comparing the mean score percentages of the domains and the global DREEM. Conclusion: Students positively evaluated the educational environment in the subjects Semiology I and II created by the new active teaching methodologies adopted by the institution, with the SPT domain being highlighted.

Pharmaceutical care (PC) is in the implementation process in Brazil and Latin America. Synthesis of evidence has been requested for monitoring and evaluating the process regarding the treatment effect. The objective is to build and disseminate a systematic review protocol to make a standard for updating results from pharmaceutical care for hypertension and for other diseases. This is a protocol for systematic review studies regarding a real example of a protocol reasoned in pharmaceutical care for hypertension in primary care. This protocol was delineated grounded in the Cochrane Handbook. Descriptors and words were defined using MeSH (Medical Subject Headings), DeCS (Descriptors in Health Sciences) and Emtree thesaurus, and the search was performed in English, Spanish and Portuguese, without filters, up to March, 27th, 2017. The results were structured in the PRISMA flowchart. Results found from all databases were: the Cochrane Library (n= 202); PubMed (n= 2608); LILACs (n= 909); Embase (n= 1653); Scopus (n=1298); IPA (n=967); and Web of Sciences (n=435). From these, 1688 were duplicate articles. The content of this paper can aid the constant monitoring of pharmaceutical care implementation and contribute to the improvement of the quality and evidence levels of published studies.

Resumo A modelagem do recrutamento em florestais tropicais é importante para estudos de sustentabilidade do manejo florestal, por dar subsídio adequado à recuperação do estoque de madeira. O objetivo do trabalho foi estimar o recrutamento após a colheita de madeira, empregando um modelo de rede neural artificial (RNA). A área de estudo está localizada na Floresta Nacional do Tapajós (55°00’ W, 2°45’ S), Pará. Em 64 ha da área de estudo, em 1979, foi realizada colheita intensiva de 72,5 m3 ha-1. Em 1981 foram instaladas, aleatoriamente, 36 parcelas permanentes de 50 m x 50 m. Essas parcelas foram mensuradas em 1982, 1983, 1985, 1987, 1992, 1997, 2007, 2010 e 2012. Para modelar o recrutamento foram consideradas as variáveis da subparcela-alvo e a sua vizinhança. As estimativas obtidas no treino e na generalização da RNA foram avaliadas pelas estatísticas: correlação () e raiz quadrada do erro quadrático médio (RQRQM), sendo obtido RQRQM 35,6% e 0,89. Foi possível modelar a tendência do recrutamento ao longo do tempo em florestas tropicais, após a colheita de madeira.

Abstract Recruitment models in tropical forests are important for studies on forest management sustainability because they provide adequate support to recovery of wood stocks. The objective of this work was to estimate recruitment after wood harvesting by using an artificial neural network (ANN) model. The study area is located at Tapajós National Forest (55° 00’ W, 2° 45’ S), Pará state. In 64 ha of the study area, in 1979, an intensive harvest of 72.5 m3 ha-1 was carried out. In 1981, 36 permanent plots of 50 m x 50 m were randomly installed. These plots were measured in 1982, 1983, 1985, 1987, 1992, 1997, 2007, 2010 and 2012. For recruitment modeling, the variables of the target subplot and its vicinity were considered. The estimates obtained in ANN training and generalization were evaluated by statistics: correlation () and root mean square error (RMSE) were determined: RMSE 35.6% and 0.89. Recruitment tendency could be modeled over time in tropical forests after wood harvesting.

Resumo A procura intensa por essências madeireiras nativas consolidadas, que apresentam elevado uso, pode ocasionar a superexploração de espécies e diminuição do seu estoque na floresta. Uma alternativa para essa situação é a substituição dessas espécies por outras com propriedades da madeira semelhantes e com suficiente estoque de crescimento na floresta. O objetivo deste trabalho foi agrupar as espécies da Amazônia através das propriedades físico-mecânicas da madeira e realizar a análise discriminante para identificar quais características tecnológicas são mais importantes para o agrupamento. As espécies estudadas foram provenientes de oito localidades distintas da região amazônica. As propriedades físico-mecânicas utilizadas obtidas da literatura especializada nacional foram: densidade básica, contração (tangencial, radial e volumétrica), flexão estática, compressão paralela e perpendicular às fibras, dureza Janka paralela e transversal, tração perpendicular às fibras, fendilhamento e cisalhamento. Foi utilizada a técnica de análise multivariada de Cluster (distância euclidiana simples e o método de Ward) e a análise discriminante para avaliar o agrupamento. A análise de Cluster foi eficiente para agrupar as espécies, que foram separadas em três grupos distintos. As espécies que se destacaram foram a Helicostylis pedunculata Benoist. e Tachigali chrysophylla (Poepp.) Zarucchi & Herend., por se agruparem com as espécies mais comercializadas. Os menores valores de Wilks’Lambda foram da densidade da madeira (0,759053), cisalhamento (0,802960) e compressão paralela às fibras (0,825594). Essas características foram as mais determinantes para discriminar os grupos. A análise de agrupamento é eficiente para indicar a substituição de espécies consolidadas na Amazônia.

Abstract The intense search for consolidated native wood essences, which are highly used, can lead to the overexploitation of species and decrease their stocks in the forest. An alternative to this situation is the replacement of these species by others with similar wood properties and with sufficient forest growing stock. The objective of this work was to cluster the Amazon species through wood physical-mechanical properties and perform the discriminant analysis to identify which technological characteristics are more important for the clustering. The species studied came from eight different locations in the Amazon region. The properties used were: basic density, contraction (tangential, radial and volumetric), static flexion, compression parallel and perpendicular to the fibers, Janka hardness parallel and transversal, traction perpendicular to the fibers, cracking and shearing, all obtained from the national specialized literature. Multivariate Cluster analysis (simple Euclidean distance and Ward’s method) and the discriminant analyses were used to evaluate the clustering. Cluster analysis was efficient to cluster the species, which were separated into three distinct groups. The species that stood out were Helicostylis pedunculata Benoist. and Tachigali chrysophylla (Poepp.) Zarucchi & Herend., f or clustering with the most commercialized species. The lowest values of Wilks’Lambda were wood density (0.759053), shearing (0.802960) and compression parallel to the fibers (0.825594). These characteristics were the most determinant to discriminate the clusters. The clustering analysis was efficient for the separation of the species into marketing clusters.

Resumo A implementação de atividades práticas que envolvam cores constitui uma estratégia poderosa para estimular o interesse de crianças e adolescentes para a Ciência. Devido ao seu forte apelo visual e presença no cotidiano, as cores despertam a curiosidade dos estudantes e propiciam o aprendizado de conceitos fundamentais no campo da óptica, tais como reflexão, transmissão e refração. Nesse trabalho, descrevemos um programa de atividades desenvolvido para ensinar conceitos de óptica presentes na formação de cores a partir de materiais simples, baratos e acessíveis. Através de demonstrações abertas e discussões autônomas por parte dos estudantes, elucidamos o processo de formação de cores por reflexão e transmissão, bem como a razão pela qual se pode visualizar objetos incolores. As atividades aqui descritas foram apresentadas num evento de divulgação científica direcionado a crianças e adolescentes com idade entre 8 e 17 anos.

Abstract The implementation of practical activities that involve colors consists in a powerful strategy to stimulate the children and teenagers' interest in Science. Due to its strong visual appeal and presence in everyday life, colors spark students' curiosity and allow the learning of fundamental concepts in Optics, such as reflection, transmission and refraction. In this work, we describe a program of activities developed to teach concepts of Optics present in color formation by means of simple, cheap and accessible materials. Through open demonstrations and the students' autonomous discussion, we clarify the process of color formation by reflection and transmission, as well as the reason by which we can observe colorless objects. The activities described here were presented in a science outreach event directed to children and teenagers with ages ranging from 8 to 17 years old.

Abstract: Timber from the second cutting cycle may make up the majority of future crop volumetric. However, there are few studies of the physical and mechanical properties of this timber, which are important to support the consolidation of new species. This study aimed to use Artificial Neural Networks to estimate the physical and mechanical properties of wood from the Amazon, based on basic density. The properties were: shrinkage (tangential, radial and volumetric), static bending, parallel and perpendicular to the fiber compression, parallel and transverse to the fibers, Janka hardness, traction, splitting and shear. The estimate followed the tendency of the data observed for the tangential, radial and volumetric shrinkage. The network estimated the mechanical properties with significant accuracy. Distribution of errors, static bending, parallel compression and perpendicular to the fiber compression also showed significant accuracy. Artificial Neural Networks can be used to estimate the physical and mechanical properties of wood from Amazon species.

RESUMO No manejo florestal é importante projetar a distribuição diamétrica ao longo do ciclo de corte para subsidiar as técnicas silviculturais mais adequadas à estrutura da floresta. O objetivo do trabalho foi projetar a distribuição diamétrica ao longo do ciclo de corte utilizando Matriz de Transição Markoviana. Em 1979 foi realizada a colheita seletiva, com intensidade de 72,5 m3 ha-1, em uma área de 64 ha, na Floresta Nacional do Tapajós, Pará. Em 1981 foram instaladas, aleatoriamente, 36 parcelas permanentes de 50 m x 50 m medidas sucessivamente em 1982, 1983, 1985, 1987, 1992, 1997, 2007, 2010 e 2012. Para a projeção foram usadas duas matrizes de transição: uma com intervalo de tempo de um ano (1981 a 1982) e outra de dois anos (1981 a 1983). Todas as projeções apresentaram distribuição diamétrica em forma de “J” invertido, com pequena descontinuidade no último ano (2012). Houve aderência da distribuição diamétrica a 5% de significância entre os dados observados e estimados até aos 11 anos de projeção. A matriz de transição pode ser usada para projetar a distribuição diamétrica após a colheita em pequenos períodos de tempo após a colheita florestal.

ABSTRACT In forest management, it is important to project diametric distribution along the cutting cycle to subsidize the most suitable silvicultural techniques to forest structure. The aim of this work was to project diametric distribution along the cutting cycle using Markov Transition Matrix. In 1979, selective harvest was performed with an intensity of 72.5 m3 ha-1, in a 64 ha area in ‘Floresta Nacional do Tapajós’ - Pará state (PA). In 1981, 36 permanent plots of 50m x 50m were randomly installed and measured successively in 1982, 1983, 1985, 1987, 1992, 1997, 2007, 2010 and 2012. For the projection, two transition matrices were used: one with time interval of one year (1981 to 1982) and another of two years (1981 to 1983). All projections showed diametric distribution in inverted “J” form, with small discontinuity last year (2012). There was adherence of diametric distribution at 5% significance between observed and estimated data, up to 11 years of projection. Transition matrix can be used to project diametric distribution after harvest in short periods of time after the forest harvest.