1,047 research outputs found
Produção e estado nutricional do milho em cultivo intercalar com adubos verdes.
O presente trabalho teve por objetivo avaliar o estado nutricional e a produção do milho quando submetido ao cultivo intercalar com adubos verdes
Resposta de Panicum maximum cv. Tanzânia a fontes e doses de fósforo no estabelecimento.
O objetivo deste estudo foi verificar a resposta do Capim Tanzânia a fontes e doses de fósforo (P) no estabelecimento
Thyroid ultrasonography reporting: consensus of Italian Thyroid Association (AIT), Italian Society of Endocrinology (SIE), Italian Society of Ultrasonography in Medicine and Biology (SIUMB) and Ultrasound Chapter of Italian Society of Medical Radiology (SIRM)
Thyroid ultrasonography (US) is the gold standard for thyroid imaging and its widespread use is due to an optimal spatial resolution for superficial anatomic structures, a low cost and the lack of health risks. Thyroid US is a pivotal tool for the diagnosis and follow-up of autoimmune thyroid diseases, for assessing nodule size and echostructure and defining the risk of malignancy in thyroid nodules. The main limitation of US is the poor reproducibility, due to the variable experience of the operators and the different performance and settings of the equipments. Aim of this consensus statement is to standardize the report of thyroid US through the definition of common minimum requirements and a correct terminology. US patterns of autoimmune thyroid diseases are defined. US signs of malignancy in thyroid nodules are classified and scored in each nodule. We also propose a simplified nodule risk stratification, based on the predictive value of each US sign, classified and scored according to the strength of association with malignancy, but also to the estimated reproducibility among different operators
Parametrização do modelo DSSAT/CANEGRO para as cultivares brasileiras de cana-de-açúcar.
A parametrização do modelo DSSAT/CANEGRO para a realidade brasileira tem grande importância para a obtenção de uma ferramenta capaz de otimizar o planejamento da produção sucroalcooleira nacional e analisar os impactos do aquecimento global na cultura da cana-de-açúcar no Brasil. O trabalho foi realizado com as cultivares IAC 91-1099 e SP 89-1115. Os dados biométricos foram coletados na APTA em Piracicaba-SP e analisados na Embrapa Informática Agropecuária em Campinas-SP, comparando-se com os dados gerados pelo modelo. Verificou-se que é possÃvel parametrizar os dados de perfilhamento e altura de colmo, com bons resultados, porém a parametrização do IAF necessita de mais estudos. Essas análises indicam possibilidades promissoras para o uso do modelo CANEGRO para as cultivares brasileiras.CBA 2009
Arquitetura foliar e coeficiente de extinção de radiacao solar para duas variedades de cana-de-açúcar.
O objetivo do trabalho foi avaliar um método computacional para a determinação do ângulo de inserção foliar (AIF) em cana-de-açúcar com base em imagens digitais, em comparação com medidas de campo segundo uma metodologia tradicional, para duas cultivares de cana-de-açúcar (IAC91-1099 e SP89-1115). Além dessa comparação, estimou-se o coeficiente de extinção (K) para radiação solar, observando-se a propagação do erro de estimativa do AIF nesta estimativa. Os ângulos medidos e os estimados não tiveram diferença estatisticamente significativa a 5% de probabilidade com o teste Tukey, com exceção da folha +2 na cultivar SP89-1115. Isso, contudo, não resultou em diferença na determinação do K medido e estimado. A cultivar SP89-1115 obteve K maior do que o estimado para a cultivar IAC91-1099, variando entre 0,44 e 0,74 considerando valores calculados para as 12:00. Considerando a variação horária de K, os valores oscilaram entre 0,5 e 6,5. Podemos concluir que o método computacional é valido para estimar o ângulo de inserção foliar e existe diferença entre as duas cultivares no ângulo de inserção ocasionando diferença no cálculo do K.CBA 2009
Adsorção de sulfato pelo solo
The adsorption of sulfate by soil samples was studied and the data obtained showed that amount of SO4(2-) adsorbed increased with the equilibrium aqueous phase sulfate concentration at constant soil pH and decreased with soil pH at constante sulfate concentration of the equilibrium solution. The linear form of the Freundlich adsorption equation expressed the relationship between log x/m and between log C and soil pH.Avaliou-se a capacidade de retenção ou adsorção do ânsion sulfato por várias amostras de solos, mediante a agitação de dois gramas de material com 5 ml de soluções padrões contendo quantidades crescentes de sulfato. Após um repouso durante 16 horas, procedeu-se à determinação do teor de sulfato da solução de equilÃbrio. Calculou-se a quantidade de sulfato adsorvida por diferença entre a originalmente existente e a determinada na solução de equilÃbrio após a agitação da suspensão do solo e repouso. O material estudado constituiu-se de amostras de solos procedentes de vários horizontes de diversas séries do MunicÃpio de Piracicaba, tratadas com carbonato de cálcio a fim de se obter uma variação relativamente ampla do pH. Os dados obtidos evidenciaram que a quantidade de sulfato adsorvido pelas amostras de solos estudadas aumenta com a concentração de sulfato da solução de equilÃbrio e diminui à medida que se eleva o pH. A equação de Freundlich, na sua forma linear, traduziu de um modo adequado a dependência da quantidade de sulfato adsorvida pelo so lo (log x/m) da concentração de sulfato da solução de equilÃbrio (log c) e do pH do solo
Efeito do parcelamento e época de fornecimento de nitrogênio na produção de materia seca na cultura do milho (Zea mays L.).
Pretendeu-se com este trabalho avaliar o efeito da época e do parcelamento do nitrogênio sobre a produção de materia seca total (raiz, colmo e folhas) na cultura do milho
Evaluating the Relationship Between Visual Acuity and Utilities in Patients With Diabetic Macular Edema Enrolled in Intravitreal Aflibercept Studies
PURPOSE. The purpose of this study was to explore the relationship between visual acuity and utility (health-related quality of life) in diabetic macular edema (DME) using intravitreal aflibercept data.
METHODS. The relationship between visual acuity in the best-seeing eye (BSE) and worseseeing eye (WSE) and utility was explored using ordinary least squares (OLS) and randomeffects models adjusted for different covariates (age, age2 , sex, body mass index, smoking status, glycated hemoglobin, diabetes severity, comorbidities, and geographic region). Utility was measured using the EuroQoL-five dimensions questionnaire (EQ-5D) and Visual Functioning Questionnaire-Utility Index (VFQ-UI). For each model, coefficients (R2 ) were reported, and WSE/BSE was expressed as the ratio of coefficients (OLS models). Models were independent of treatment effects, and outcomes from all time points (up to week 100) were included where available.
RESULTS. Data from 1320 patients with DME were analyzed. In all models, the association between visual acuity (BSE > WSE) was stronger with VFQ-UI– than EQ-5D–derived utilities. The estimated relationship between VFQ-UI and visual acuity in the BSE and WSE was robust, even with an increasing number of covariates. WSE/BSE coefficient ratios were similar across VFQ-UI OLS models (32%) compared with EQ-5D models (41%–48%). Actual (unadjusted) versus predicted data plots also showed a better fit with VFQ-UI– than EQ-5D–derived utilities.
CONCLUSIONS. These analyses show that VFQ-UI was more sensitive than EQ-5D–derived utilities for measuring the impact of visual acuity in the BSE and WSE. Visual acuity in the BSE was a major contributor to utility, but WSE is also important though to a lesser degree as shown by the coefficient ratios. These new data will be useful for health technology assessments in DME, where utilities data are lacking. Keywords: diabetic macular edema, intravitreal aflibercept, utilit
An approach for assessing the effects of site-specific fertilization on crop growth and yield of durum wheat in organic agriculture
Nutrient absorption in lambs fed diets containing different amounts of phosphorus
Objective. Evaluate the effect of increasing P intake on nutrient digestibility, and compare the true and apparent absorption coefficients of P and Ca in lambs. Materials and methods. Twenty-four Santa Ines sheep, with an average weight of 33.6 ± 1.6 kg, were distributed into four treatments (0, 2, 4 and 6 g/day of supplementary P) with forage: concentrate ratio of 70:30. The study of apparent nutrient digestibility was conducted during the first week, using the total feces collection method. During the second week, after injection of 7.4 MBq of 32P and 7.7 MBq of 45Ca, apparent (AAC) and true (TAC) absorption coefficients of P and Ca were determined. The lambs were kept in metabolic cages. Results. The increase in P intake did not affect (p>0.05) dry matter, crude protein, NDF or ADF digestibility, but the TAC of P and Ca and mineral matter digestibility decreased. The AAC was not affected (p=0.10). A cubic relationship was observed between P intake and TAC (TAC=2.16–1.95X+0.55X2-0.04X3; R2=0.38) and linear relationship with the TAC of Ca (TAC=0.559–0.03X; R2=0.26). TAC and AAC values were different (p<0.001). Conclusions. The increase in P intake doesn’t impact organic matter digestibility, but does affect P and Ca absorption. Apparent digestibility is not a reliable parameter to determine the efficiency of P and Ca absorption
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