Abstract The study addresses the historical disparities in the distribution of the medium- and high-complexity health network and the limits to budget adjustments between the municipality of Rio de Janeiro and its neighboring municipalities of the Metropolitan region 1. An ecological study was conducted with data related to the municipality of Rio de Janeiro, chosen because it has a large assistance network, while located on the borders of vulnerable and underprivileged areas, characterizing a locus that is representative of the situations faced throughout the country. A decrease in the gross values of the programmed quotas in all municipalities of Rio de Janeiro was observed from 2016 onwards. The temporal trend of the programmed quotas remained stable for all municipalities in the Metropolitan Region 1, even with significant increases in the accomplished quotas for neighboring municipalities. The resulting overload in local expenditure prevents the increase of capacity to anticipate fluctuations in demand, both known and unexpected ones, compromising the responsiveness of the health system regarding its regular operation, as well as the ability to adjust to cope with extraordinary events, essential characteristics of resilience.

Resumo O estudo explora as históricas disparidades regionais na distribuição da rede de média e alta complexidade e os limites impostos para a o remanejamento dos tetos de financiamento entre o município do Rio de Janeiro e municípios limítrofes da Região Metropolitana 1. Foi realizado um estudo ecológico com dados referentes à cidade do Rio de Janeiro, escolhido por ter uma grande rede de assistência e limites com territórios vulneráveis e carentes de serviços de saúde, caracterizando um lócus representativo das situações enfrentadas em todo o país. Foi observado um decréscimo dos valores brutos das cotas programadas em todos os municípios do Rio de Janeiro a partir de 2016. A tendência temporal das cotas programadas se manteve estacionária para todos os municípios da Região Metropolitana 1, mesmo com aumentos significativos nas cotas para municípios limítrofes. A resultante sobrecarga no aporte local de recursos impede o aumento da capacidade para antecipar flutuações de demanda, tanto conhecidas quanto inesperadas, comprometendo a responsividade do sistema de saúde no que respeita seu funcionamento regular, bem como a capacidade de ajuste para lidar com eventos extraordinários, características essenciais da resiliência.

Abstract The study addresses the historical disparities in the distribution of the medium- and high-complexity health network and the limits to budget adjustments between the municipality of Rio de Janeiro and its neighboring municipalities of the Metropolitan region 1. An ecological study was conducted with data related to the municipality of Rio de Janeiro, chosen because it has a large assistance network, while located on the borders of vulnerable and underprivileged areas, characterizing a locus that is representative of the situations faced throughout the country. A decrease in the gross values of the programmed quotas in all municipalities of Rio de Janeiro was observed from 2016 onwards. The temporal trend of the programmed quotas remained stable for all municipalities in the Metropolitan Region 1, even with significant increases in the accomplished quotas for neighboring municipalities. The resulting overload in local expenditure prevents the increase of capacity to anticipate fluctuations in demand, both known and unexpected ones, compromising the responsiveness of the health system regarding its regular operation, as well as the ability to adjust to cope with extraordinary events, essential characteristics of resilience.

Resumo O estudo explora as históricas disparidades regionais na distribuição da rede de média e alta complexidade e os limites impostos para a o remanejamento dos tetos de financiamento entre o município do Rio de Janeiro e municípios limítrofes da Região Metropolitana 1. Foi realizado um estudo ecológico com dados referentes à cidade do Rio de Janeiro, escolhido por ter uma grande rede de assistência e limites com territórios vulneráveis e carentes de serviços de saúde, caracterizando um lócus representativo das situações enfrentadas em todo o país. Foi observado um decréscimo dos valores brutos das cotas programadas em todos os municípios do Rio de Janeiro a partir de 2016. A tendência temporal das cotas programadas se manteve estacionária para todos os municípios da Região Metropolitana 1, mesmo com aumentos significativos nas cotas para municípios limítrofes. A resultante sobrecarga no aporte local de recursos impede o aumento da capacidade para antecipar flutuações de demanda, tanto conhecidas quanto inesperadas, comprometendo a responsividade do sistema de saúde no que respeita seu funcionamento regular, bem como a capacidade de ajuste para lidar com eventos extraordinários, características essenciais da resiliência.

ABSTRACT This research aimed to prospect the working conditions of the rescue teams of the Mobile Emergency Care Service (SAMU-192) at the fluvial areas of the Alto Solimoes region, trough the systemic analysis of the activities of the water ambulances service popularly called ‘ambulanchas’ during the peaks of COVID-19 in the state of Amazonas, when the health system functioned under stress caused by the pandemic. Data were obtained from an exploratory cross-sectional design, based on qualitative data collected through interviews and observation of the normal functioning of the system before the pandemic. From there, models of two scenarios were developed showing the functioning of the water ambulances service when coping with the COVID-19 pandemic and the impact on the working conditions of the interprofessional rescue teams. Remote interviews with workers after the pandemic indicated that the prospection of working conditions from the instances of the models corresponded to the real functioning of the system during the COVID-19 pandemic.

RESUMO Esta pesquisa teve como objetivo prospectar as condições de trabalho das equipes de socorro do Serviço de Atendimento Móvel de Urgência (Samu-192) fluvial das áreas ribeirinhas e costeiras da região do Alto-Solimões, a partir da análise sistêmica das atividades no serviço de embarcações popularmente chamadas de ‘ambulanchas’ durante os picos da Covid-19 no estado do Amazonas, quando o sistema de saúde funcionou sob o estresse provocado pela pandemia. Os dados foram obtidos a partir de um desenho transversal exploratório, baseado em dados qualitativos coletados por meio de entrevistas e observação do funcionamento normal do sistema antes da pandemia. A partir daí modelos de dois cenários foram elaborados mostrando o funcionamento do serviço de ambulanchas ao lidar com a pandemia de Covid-19 e o impacto nas condições de trabalho das equipes de socorro interprofissionais de socorro. Entrevistas remotas com trabalhadores das ambulanchas após a pandemia indicaram que a prospecção das condições de trabalho a partir das instâncias dos modelos corresponderam ao funcionamento real do sistema durante a pandemia de Covid-19.

ABSTRACT This research aimed to prospect the working conditions of the rescue teams of the Mobile Emergency Care Service (SAMU-192) at the fluvial areas of the Alto Solimoes region, trough the systemic analysis of the activities of the water ambulances service popularly called ‘ambulanchas’ during the peaks of COVID-19 in the state of Amazonas, when the health system functioned under stress caused by the pandemic. Data were obtained from an exploratory cross-sectional design, based on qualitative data collected through interviews and observation of the normal functioning of the system before the pandemic. From there, models of two scenarios were developed showing the functioning of the water ambulances service when coping with the COVID-19 pandemic and the impact on the working conditions of the interprofessional rescue teams. Remote interviews with workers after the pandemic indicated that the prospection of working conditions from the instances of the models corresponded to the real functioning of the system during the COVID-19 pandemic.

RESUMO Esta pesquisa teve como objetivo prospectar as condições de trabalho das equipes de socorro do Serviço de Atendimento Móvel de Urgência (Samu-192) fluvial das áreas ribeirinhas e costeiras da região do Alto-Solimões, a partir da análise sistêmica das atividades no serviço de embarcações popularmente chamadas de ‘ambulanchas’ durante os picos da Covid-19 no estado do Amazonas, quando o sistema de saúde funcionou sob o estresse provocado pela pandemia. Os dados foram obtidos a partir de um desenho transversal exploratório, baseado em dados qualitativos coletados por meio de entrevistas e observação do funcionamento normal do sistema antes da pandemia. A partir daí modelos de dois cenários foram elaborados mostrando o funcionamento do serviço de ambulanchas ao lidar com a pandemia de Covid-19 e o impacto nas condições de trabalho das equipes de socorro interprofissionais de socorro. Entrevistas remotas com trabalhadores das ambulanchas após a pandemia indicaram que a prospecção das condições de trabalho a partir das instâncias dos modelos corresponderam ao funcionamento real do sistema durante a pandemia de Covid-19.

ABSTRACT Objectives. To develop and test a framework to assess the potential of public health systems to maintain a resilient performance. Methods. Quantitative data from public databases and qualitative data from technical reports of Brazilian health authorities were used to develop the framework which was assessed and modified by experts. Fuzzy logic was used for the mathematical model to determine scores for four resilient abilities – monitoring, anticipation, learning, and response – and an aggregated coefficient of resilient potential in health care. The coefficient measures used data from before the coronavirus disease 2019 (COVID-19) pandemic. These were compared with measures of the actual performance of health systems in 10 cities in Brazil during the pandemic. Results. The coefficient of resilient potential in health care showed that the cities most affected by COVID-19 had lower potential for resilient performance before the pandemic. Some local health systems had adequate response capabilities, but other abilities were not well developed, which adversely affected the management of the spread of COVID-19. Conclusions. The coefficient of resilient potential in health care is useful to indicate important areas for resilient performance and the different types of resilience capacities that can be considered in different contexts and levels of public health systems. Regular assessment of the potential of health systems for resilient performance would help highlight opportunities for continuous improvement in health system functions during chronic stress situations, which could strengthen their ability to keep functioning in the face of sudden disturbances.

RESUMO Objetivos. Desenvolver e testar uma estrutura de avaliação do potencial dos sistemas de saúde pública de manter um desempenho resiliente. Métodos. Dados quantitativos de bancos de dados públicos e dados qualitativos de relatórios técnicos das autoridades sanitárias brasileiras foram utilizados para desenvolver a estrutura, que foi avaliada e modificada por especialistas. A lógica fuzzy foi utilizada na criação de um modelo matemático para determinar a pontuação em quatro capacidades de resiliência (monitoramento, antecipação, aprendizagem e resposta) e um coeficiente agregado do potencial de resiliência na atenção à saúde. O coeficiente foi calculado utilizando dados anteriores à pandemia da doença provocada pelo coronavírus de 2019 (COVID-19). Esses dados foram comparados com medidas do desempenho real dos sistemas de saúde em 10 cidades brasileiras durante a pandemia. Resultados. O coeficiente de potencial de resiliência na atenção à saúde revelou que as cidades mais afetadas pela COVID-19 tinham menor potencial de desempenho resiliente antes da pandemia. Alguns sistemas de saúde locais tinham capacidades de resposta adequadas, porém as outras capacidades não estavam bem desenvolvidas, o que prejudicou o gerenciamento da propagação da COVID-19. Conclusões. O coeficiente de potencial de resiliência na atenção à saúde é útil para indicar áreas importantes para um desempenho resiliente e os vários tipos de capacidade de resiliência que podem ser considerados em diferentes contextos e níveis dos sistemas de saúde pública. Uma avaliação periódica do potencial de desempenho resiliente dos sistemas de saúde ajudaria a assinalar oportunidades para melhorias contínuas das funções desses sistemas durante situações de estresse crônico, o que poderia aumentar sua capacidade de continuar funcionando diante de perturbações repentinas.

RESUMEN Objetivos. Elaborar y examinar un marco para evaluar el potencial de los sistemas de salud pública de mantener un desempeño resiliente. Métodos. Para elaborar el marco, se emplearon datos cuantitativos de bases de datos públicas y datos cualitativos de informes técnicos de las autoridades de salud brasileñas. A continuación, este marco fue evaluado y modificado por expertos. Se utilizó la lógica difusa en el modelo matemático empleado para determinar la puntuación de cuatro capacidades resilientes (seguimiento, anticipación, aprendizaje y respuesta) y un coeficiente agregado de potencial resiliente en la atención médica. Para las medidas del coeficiente se emplearon datos previos a la pandemia de la enfermedad por el coronavirus del 2019 (COVID-19), que se compararon con las medidas del desempeño real de los sistemas de salud en diez ciudades de Brasil durante la pandemia. Resultados. El coeficiente de potencial resiliente en la atención de salud indicó que las ciudades más afectadas por la COVID-19 presentaban un menor potencial de desempeño resiliente antes de la pandemia. En algunos sistemas de salud locales la capacidad de respuesta era adecuada pero otras capacidades no estaban suficientemente desarrolladas, lo que afectó de manera negativa el manejo de la propagación de la COVID-19. Conclusiones. El coeficiente de potencial resiliente en la atención de salud es útil para indicar aspectos importantes del desempeño resiliente y los diferentes tipos de capacidades de resiliencia que pueden considerarse en diferentes contextos y niveles de los sistemas de salud pública. La evaluación periódica del potencial de los sistemas de salud para tener un desempeño resiliente ayudaría a poner de relieve las oportunidades de mejora continua de las funciones del sistema de salud en situaciones de estrés crónico, lo que podría fortalecer su capacidad para seguir funcionando frente a perturbaciones repentinas.

RESUMEN: Objetivo: Analizar el conocimiento y la autoeficacia de personas con diabetes mellitus tipo 2. Metodología: Estudio transversal y cuantitativo, realizado en un hospital público de la ciudad de Recife - PE, con 86 personas con diabetes. Se analizaron variables sociodemográficas, clínicas y de laboratorio, además del conocimiento y autoeficacia en diabetes mediante la Diabetes Knowledge Scale y la Diabetes Management Self-efficacy Scale, respectivamente. Para el análisis se utilizó estadística descriptiva y prueba t de Student para muestras independientes para verificar homogeneidad y comparación de medias. Resultados: La mayoría de los pacientes eran del sexo femenino, menores de 60 años, con baja escolaridad, bajos ingresos y control inadecuado de la diabetes. Predominó el conocimiento insuficiente y la baja autoeficacia. El conocimiento suficiente interfirió positivamente en la autoeficacia en la práctica de ejercicio físico y el conocimiento insuficiente interfirió en la autoeficacia para la corrección de la glucemia. Los individuos eran autoeficaces independientemente de la edad. Conclusión: Fue posible identificar el perfil de conocimientos y autoeficacia de los participantes, apoyando la planificación de intervenciones de enfermería en el cuidado de personas con Diabetes Mellitus con el objetivo de promover el autocuidado.

RESUMO: Objetivo: Analisar o conhecimento e a autoeficácia de indivíduos com diabetes mellitus tipo 2. Metodologia: Estudo transversal e quantitativo, realizado em um hospital público da cidade do Recife - PE, com 86 indivíduos com diabetes. Foram analisadas variáveis sociodemográficas, clínicas e laboratoriais, além do conhecimento e a autoeficácia em diabetes pelo Diabetes Knowledge Scale e a Diabetes Management Self-efficacy Scale, respectivamente. Para a análise, utilizou-se estatística descritiva e teste T Student para amostras independentes na verificação da homogeneidade e comparação de média. Resultados A maioria dos pacientes era do sexo feminino, com idade inferior a 60 anos, baixa escolaridade, baixa renda e com controle inadequado do diabetes. Prevaleceu o conhecimento insuficiente e a baixa autoeficácia. O conhecimento suficiente interferiu positivamente na autoeficácia quanto à prática de exercício físico e o conhecimento insuficiente interferiu na autoficácia para a correção da glicose sanguínea. Indivíduos foram autoeficazes independente da idade. Conclusão: Os indivíduos com diabetes têm conhecimento insuficiente e baixa autoeficácia, sendo necessário que os enfermeiros considerem tais aspectos no planejamento das intervenções de enfermagem voltadas a este público com vistas à promoção do autocuidado.

ABSTRACT: Objective: To analyze the knowledge and self-efficacy of individuals with type 2 diabetes mellitus. Methodology: A cross-sectional and quantitative study was conducted in a public hospital in Recife, PE, with 86 individuals with diabetes. Sociodemographic, clinical, and laboratory variables were analyzed, in addition to knowledge and self-efficacy in diabetes, using the Diabetes Knowledge Scale and the Diabetes Management Self-Efficacy Scale, respectively. Descriptive statistics and Student's t-test for independent samples were used to verify homogeneity and compare means. Results: Most patients were female, under 60, with low education, low income, and inadequate diabetes control. Insufficient knowledge and low self-efficacy prevailed. Sufficient knowledge positively interfered with self-efficacy regarding physical exercise, and insufficient knowledge interfered with self-efficacy for blood glucose control. Individuals were self-efficacious regardless of age. Conclusion: Individuals with diabetes have insufficient knowledge and low self-efficacy, and nurses need to consider these aspects when planning nursing interventions aimed at these persons to promote self-care.

Abstract Eugenol is a phenolic compound with numerous biological activities. It is widely used in dentistry to treat toothache and pulpitis. In particular, eugenol may be used for tooth whitening procedures to minimize dental sensitivity in patients. However, eugenol has some disadvantages such as its volatility, its photosensitivity, and immediate effect, which can be avoided by using pharmaceutical nanotechnology. The aim of the present study was to obtain, characterize, quantify, and evaluate the physicochemical stability of eugenol-loaded Eudragit RS100 nanocapsules. The nanocapsules (NCs) were prepared by interfacial deposition of the preformed polymer method. The NCs were characterized through morphological and spectroscopic studies. The encapsulation efficiency was achieved by quantifying the non-encapsulated eugenol using a previously developed and validated analytical method. The physicochemical stability of NCs was assessed at predetermined time intervals for 90 days after preparation. The nanocapsules were successfully prepared by the chosen method and had a predominantly spherical shape with a smooth surface. The mean size, the polydispersion index, and the zeta potential were in agreement to literature data. Infrared spectra ensured that the nanoencapsulation process did not result in chemical reactions between the drug and the polymer. The formulations showed encapsulation efficiency higher than 90% and remained stable after 60 days of preparation. Thus, eugenol-loaded Eudragit RS100 nanocapsules may be further considered as an alternative formulation for dental sensitivity in order to provide a controlled release, a decreased toxicity, and a better dental sensitivity relief.

Abstract Objective: Identify the one-year survival rate and major complications in patients submitted to pneumonectomy for infectious disease. Methods: Retrospective data from all cases of infectious disease pneumonectomy over the past 10 years were collected from two reference centers. The authors analyzed: patient demographics, etiology, laterality, bronchial stump treatment, presence of previous pulmonary resection, postoperative complications in the first 30 days, the treatment used in pleural complications, and one-year survival rate. Results: 56 procedures were performed. The average age was 44 years, with female predominance (55%). 29 cases were operated on the left side (51%) and the most frequent etiology was post-tuberculosis (51.8%). The overall incidence of complications was 28.6% and the most common was empyema (19.2%). Among empyema cases, 36.3% required pleurostomy, 27.3% required pleuroscopy and 36.3% underwent thoracoplasty for treatment. Bronchial stump fistula was observed in 10.7% of cases. From all cases, 16.1% were completion pneumonectomies and 62.5% of these had some complication, a significantly higher incidence than patients without previous surgery (p = 0.0187). 30-day in-hospital mortality was (7.1%) with 52 cases (92.9%) and 1-year survival. The causes of death were massive postoperative bleeding (1 case) and sepsis (3 cases). Conclusions: Pneumonectomy for benign disease is a high-risk procedure performed for a variety of indications. While morbidity is often significant, once the perioperative risk has passed, the one-year survival rate can be very satisfying in selected patients with benign disease.

ABSTRACT The Caatinga biome in Brazil comprises the largest and most continuous expanse of the seasonally dry tropical forest (SDTF) worldwide; nevertheless, it is among the most threatened and least studied, despite its ecological and biogeographical importance. The spatial distribution of volumetric wood stocks in the Caatinga and the relationship with environmental factors remain unknown. Therefore, this study intends to quantify and analyze the spatial distribution of wood volume as a function of environmental variables in Caatinga vegetation in Bahia State, Brazil. Volumetric estimates were obtained at the plot and fragment level. The multiple linear regression techniques were adopted, using environmental variables in the area as predictors. Spatial modeling was performed using the geostatistical kriging approach with the model residuals. The model developed presented a reasonable fit for the volume m3 ha with r2 of 0.54 and Root Mean Square Error (RMSE) of 10.9 m3 ha–1. The kriging of ordinary residuals suggested low error estimates in unsampled locations and balance in the under and overestimates of the model. The regression kriging approach provided greater detailing of the global wood volume stock map, yielding volume estimates that ranged from 0.01 to 109 m3 ha–1. Elevation, mean annual temperature, and precipitation of the driest month are strong environmental predictors for volume estimation. This information is necessary to development action plans for sustainable management and use of the Caatinga SDTF in Bahia State, Brazil.

Abstract Objective: Given the high proliferative activity of germinal matrix and its direct correlation with hypoxemia, it is necessary to investigate the possible molecular regulation pathways, to understand the existing clinical relationship between the hypoxic-ischemic insult and the biomarkers NF-kB, AKT-3, Parkin, TRK-C and VEGFR-1. Methods: A hundred and eighteen germinal matrix samples of the central nervous system of patients who died in the first 28 days of life were submitted to histological and immunohistochemistry analysis to identify the tissue immunoexpression of those biomarkers related to asphyxia, prematurity, and death events within 24h. Results: A significantly increased tissue immunoexpression of NF-kB, AKT-3 and Parkin was observed in the germinal matrix of preterm infants. In addition, significantly decreased tissue immunoexpression of VEGFR-1 and NF-kB was observed in patients who experienced asphyxia followed by death within 24 hours. Conclusions: The results suggest a direct involvement between the hypoxic-ischemic insult and NF-kB and VEGFR-1 markers since a decreased immunoexpression of these biomarkers was observed in asphyxiated patients. Furthermore, it is suggested that there was not enough time for VEGFR-1 to be transcribed, translated and expressed on the surface of the plasma membrane. This temporality can be observed in the relationship between NF-kB expression and the survival time of individuals who died within 24 hours, suggesting that this factor is essential for the production of VEGFR-1 and, therefore, to carry out the necessary remodeling effect to neovascularize the affected region.

RESUMO Objetivo: Dada a alta atividade proliferativa da matriz germinativa e sua correlação direta com a hipoxemia, é necessário investigar as possíveis vias de regulação molecular para entender a relação clínica existente entre o insulto hipóxico-isquêmico e os biomarcadores NF-kB, AKT -3, Parkina, TRK-C e VEGFR-1. Métodos: Cento e dezoito amostras de matriz germinativa do sistema nervoso central de pacientes que faleceram nos primeiros 28 dias de vida foram submetidas a análise histológica e imuno-histoquímica para identificar a imunoexpressão tecidual desses biomarcadores relacionados a eventos de asfixia, prematuridade e óbito em 24 horas. Resultados: Observou-se uma imunoexpressão tecidual significativamente aumentada de NF-kB, AKT-3 e Parkin na matriz germinativa de prematuros. Além disso, constatou-se uma imunoexpressão tecidual significativamente diminuída de VEGFR-1 e de NF-kB em pacientes que apresentaram asfixia seguida de morte em 24 horas. Conclusões: Os resultados sugerem o envolvimento direto entre o insulto hipóxico-isquêmico e os marcadores NF-kB e VEGFR-1, visto que se observou uma imunoexpressão diminuída destes biomarcadores nos pacientes asfixiados. Além disso, sugere-se que não houve tempo suficiente para que o VEGFR-1 fosse transcrito, traduzido e expresso na superfície da membrana plasmática. Essa temporalidade pode ser observada na relação entre a expressão de NF-kB e o tempo de vida dos indivíduos que morreram em 24 horas, o que sugere que esse fator é essencial para a produção do VEGFR-1 e, portanto, para realizar o efeito remodelador necessário para neovascularizar a região afetada.

ABSTRACT Introduction: The long-term consequences of COVID-19, especially pulmonary impairment, are frequent but not well understood. The knowledge about sequels or long COVID-19 are necessary, considering the high prevalence and need for specific public strategies. Method: The study was conducted to evaluate symptoms (standardized questionnaire), pulmonary function (spirometry), and exercise capacity (6-minute-walk-test) at 30 (D30), 90 (D90), and 180 (D180) days after hospital discharge of patients surviving to severe COVID-19. We excluded in this follow up patients with comorbidities before COVID infection. Results: 44 patients were included and 31 (26 men) completed the 6-month follow-up (age mean 53.6 ± 9.6 years). At D180, 28% presented still at least one symptom. The most common was dyspnea (17.2%), followed by cough (13.8%), and myalgia (10.3%). All spirometric parameters showed progressive improvement from D30 to D180. However, 16% maintained a restrictive pattern on spirometry test, 44% presented desaturation on the 6-minute walk-test, and 25% walked < 75% of the predicted value. Conclusion: 6-months after hospital discharge, reduced pulmonary function and reduced exercise capacity was founded frequently and more than a quarter remained symptomatic. The persistent symptoms and functional impairment suggest that sequels and development of Long COVID-19 are very common. The identification of these patients to provide the necessary health care is a challenging task, considering the large number of patients infected and surviving to COVID-19 disease.

ABSTRACT The distribution modeling in diameter classes is an important indicator of the potential use of a forest community, as well as the projection of future forest production. The objective of this study was to evaluate the diametric structure and to select probabilistic density functions for three woody species in forested arboreal Caatinga vegetation in Bahia, Brazil. The study was carried out in the Contendas do Sincorá National Forest in the state of Bahia, Brazil. A total of 16 plots of 20 x 20 m were installed and all individuals with diameter at breast height equal to or greater than 5.0 cm were measured. The three species with the highest population density (Commiphora leptophloeos, Manihot catinga and Patagonula bahiensis) were selected for analysis and modeling of the diametric structure. Four probabilistic density models were adjusted. The Akaike information criterion was used to select the best model. The results found indicated that the three species presented a decreasing type curve. The Log-Normal function best described the diametric distribution and it can be indicated to describe the diametric distribution and assist in making decisions about the management and conservation of these species. It is concluded that the Normal function was less adequate to represent the distribution of the studied species.

ABSTRACT The objective of this work was to characterize the population structure, analyze the spatial distribution pattern and identify the potential use of the Commiphora leptopholoeos in the Contendas do Sincorá National Forest, BA. Thus, three disjoint transects of 40 x 160 m were installed for the phytosociological study and spatial distribution and subdivided into 64 plots of 10 x 10 m, for which the density and frequency values of regenerating individuals (dbh < 5 cm), and the density, frequency and basal area of arboreal size were calculated (dbh ≥ 5 cm). The spatial distribution pattern was calculated by the Morisita index, Payandeh’s dispersion index and the Chi-squared test for the different populations. The diametric distribution was in the form of a reverse J-shaped, usually indicate full regeneration with constant seed production, germination and recruitment. The stems of the species were mostly healthy, but with a large tillering percentage and tortuosity below the commercial height, constituting characteristics which favor uses for firewood, stakes and poles. The spatial distribution pattern values of the species for tree size and regeneration point to an aggregate spatial distribution or to a tendency to aggregation.

ABSTRACT Dynamics studies associated with prognosis can support planning actions for the conservation and sustainable use of forest resources. Therefore, the objective of this study was to evaluate the dynamics and predict the diameter structure using the Markov chain model for an area of caatinga forest submitted to different management practices. The study was carried out in the Contendas do Sincorá National Forest in the state of Bahia. Four treatments were installed, corresponding to three management systems and one control. Data was obtained measuring all individuals with a diameter greater than or equal to 5 cm. The measurements were performed at two moments in 2015 and 2018. The results indicated that the selective cut-by-diameter treatment had the lowest mortality rate and the highest recruitment rate. Predictions of the diameter structure using the Markov chain do not generally present statistical differences (α0.01) between the observed and expected frequencies for the year 2018. It was concluded that the basal area showed a tendency for recovery and growth in the treatments which involved suppression compared to the control, with no statistically significant differences among treatments until the moment after intervention.