Cláudio Ricardo da Silva

Efeito do ambiente protegido cultivado com melão sobre os elementos meteorológicos e sua relação com as condições externas

The objective of this research was to study the effect of greenhouse cultivated with melon (Cucumis melo L.) under meteorological elements and its relationship with external conditions. The study was carried out during the period of October 5, 2001 to January 7, 2002. The greenhouse had 420 m2, constructed in galvanized metallic structure with two voids, height in the central part of 4.6 m and lateral of 3.0 m, having four front windows covered with a film of transparent polyethylene of high density with addictive ultraviolet and thickness of 150 µm. A drip irrigation system was used with a total water depth of 279.6 mm applied. The irrigation management was done through a small evaporation pan installed inside the greenhouse. The weather data were obtained through an automatic acquisition system placed inside and outside of the greenhouse with measurements of global solar radiation, temperature and humidity of the air. The solar radiation and relative humidity were lower in the greenhouse while the temperature was higher. The relationship between weather parameters inside and outside of the greenhouse, was expressed by linear and quadratic regression equations.

Radiação solar estimada com base na temperatura do ar para três regiões de Minas Gerais

The incident solar radiation (Rs) is an important variable in agricultural studies, particularly for the estimation of evapotranspiration and yield models. However, its measurement is not commonly performed in conventional meteorological stations. The aim of this study was to evaluate nine empirical models to estimate Rs from the temperature for the Metropolitan, Vale do Rio Doce and Zona da Mata areas in Minas Gerais State, Brazil. The models used were Hargreaves, Annandale, Chen, Bristow & Campbell, Donatelli & Campbell and Hunt. Data used were obtained by Rs daily automatic weather stations installed in these regions and belonging to Instituto Nacional de Meteorologia (INMET). For all models local calibration coefficients were derived. The performance of each method was evaluated using the following statistical indicators: coefficient of determination (R2), root mean square error (RMSE), mean bias error (MBE) and test-t. The little difference between the models evaluated suggests that any of these models may be used. However, given the simplicity, performance and significance, the model of Hargreaves, calibrated and with two coefficients, is the most suitable for estimating incident solar radiation.

Índices bioclimáticos para a cultura de café

Alem dos graus-dia, varios sao os sistemas de unidades bioclimaticas, embora sua utilizacao e limitacao ainda sejam pouco conhecidas na cafeicultura. Diante disto, este trabalho objetivou avaliar o desempenho de quatro indices bioclimaticos para estimativa da duracao dos subperiodos florescimento-fruto verde cana, fruto verde cana -fruto cereja e florescimento-fruto cereja, na cultura de cafe. Durante o ano agricola 2008/2009 foram avaliados indice termico, acumulo da radiacao fotossinteticamente ativa, indice heliotermico de Geslin e acumulo da evapotranspiracao de referencia, em dez cultivares de cafe plantadas em Uberlândia, MG. Os dados obtidos para cada indice bioclimatico foram analisados atraves de estatistica classica, obtendo-se a media, o desvio padrao e o coeficiente de variacao, em que este ultimo parâmetro serviu de base para a escolha do indice bioclimatico utilizado na quantificacao da duracao dos subperiodos de cada cultivar de cafe e na classificacao do ciclo em precoce, medio e tardio. Verificou-se que os indices heliotermico de Geslin e acumulo da evapotranspiracao de referencia, apresentaram os menores coeficientes de variacao medios entre as cultivares.

Impact of post-traumatic stress disorder on oral health

BACKGROUND The stress experienced as an intense and traumatic event can increase the odds of orofacial pain, affect the biomechanics of masticatory system and compromise the periodontal health. This study was conducted to investigate the impact of post-traumatic stress disorder (PTSD) on oral health. METHODS A case-control study with a convenience sample was designed. Probing pocket depth (PPD), clinical attachment level (CAL), bleeding on probing, and plaque were recorded at 6 sites per tooth. A visual analog scale (VAS) was used to evaluate the pain after probing. The Research Diagnostic Criteria for Temporomandibular Disorders Axis II (RDC/TMD Axis II) and Structured Clinical Interview (DSM-IV) were also applied. The final sample comprised 38 PTSD patients and 38 controls. RESULTS Patients with PTSD had a higher degree of chronic pain, more depression and nonspecific physical symptoms (including and excluding pain) compared with the control group (Fisher exact test p < 0.001, and Chi-squared test, p < 0.001, < 0.001, < 0.001, respectively). Patients with PTSD also had more pain after periodontal probing compared with controls (Mann-Whitney, p = 0.037). The prevalence of sites with CAL or PPD ≥ 4, ≥ 5, ≥ 6 were not different between the groups. Age was associated with moderate periodontitis (multivariable logistic regression model, OR = 3.33, 95% CI = 1.03-10.75, p = 0.04). LIMITATION The severity of PTSD precluded an ample sample size. CONCLUSIONS Patients with PTSD presented a worse RDC/TMD Axis II profile, more pain after periodontal probing, and no difference related to periodontal clinical parameters. More studies are needed to confirm these findings.