1,062 research outputs found
Cartografia do uso atual das terras nas Áreas de Proteção Ambiental de Sousas e Joaquim Egídio, Campinas-SP, Brasil.
Divulga os resultados do levantamento, utilizando sensoriamento remoto e geoprocessamento, do uso das terras nas APAS de Sousas e Joaquim Egídio, no Município de Campinas-SP
Carta de uso atual das terras e cobertura vegetal do Município de Jaguariúna, São Paulo.
O trabalho divulga o levantamento e a elaboração da carta de uso atual das terras e da cobertura vegetal do Município de Jaguariúna, região metropolitana de Campinas-SP, com a aplicação de técnicas utilizadas em geoprocessamento
Diffusion of a ring polymer in good solution via the Brownian dynamics
Diffusion constants D_{R} and D_{L} of ring and linear polymers of the same
molecular weight in a good solvent, respectively, have been evaluated through
the Brownian dynamics with hydrodynamic interaction. The ratio ,
which should be universal in the context of the renormalization group, has been
estimated as for the large-N limit. It should be consistent
with that of synthetic polymers, while it is smaller than that of DNAs such as
. Furthermore, the probability of the ring polymer being a
nontrivial knot is found to be very small, while bond crossings may occur at
almost all time steps in the present simulation that realizes the good solvent
conditions.Comment: 11 pages, 4 figure
Variabilidade espacial da produtividade através de satélite de imagens aéreas de alta resolução.
Variabilidade espacial da produtividade através de satélites e imagens aéreas de alta resolução.
Yield of cotton cultivars under different irrigation depths in the Brazilian semi-arid region.
The objective of this study was to evaluate the effect of irrigation depths on seed cotton yield and water-use efficiency of cotton cultivars in the Brazilian semi-arid region. Field experiment was conducted during two consecutive years in the Apodi region, RN, using sprinkler irrigation. The experiment consisted of factorial combination in split-plots, composed of four irrigation depths (130; 100; 70 and 40% ETc and four cotton cultivars - FiberMax 993, BRS 286, BRS 336 and BRS 335), in randomized block design with 4 replicates. Data were evaluated by mean test (Tukey) and regression analysis. Considering the irrigation depths of 40% ETc, cotton yield was 48% lower compared to the higher irrigation depth (130% ETc). The higher water-use efficiency (0.69 kg m-3) was obtained with 70% ETc irrigation depth. The highest seed cotton yield was achieved with the higher water depth for all evaluated cultivars. Yield response factor (Ky) was equal to 0.632, 0.711, 0.784 and 0.858, for FiberMax 993, BRS 286, BRS 335 and BRS 336 cultivars, respectively. FiberMax 993 and BRS 286 cultivars presented the best performance, showing that they are more suitable for irrigated farming in the semi-arid region
Crescimento e produção do algodoeiro irrigado em resposta a adubação fosfatada residual e nitrogenada.
Clinical validation results of an innovative non-invasive device for colorectal cancer preventive screening through fecal exhalation analysis
Screening is recommended to reduce both incidence and mortality of colorectal cancer.
Currently, many countries employ fecal occult blood test (FOBT). In Emilia-Romagna (Italy), since
2005, FOBT immunochemical version (FIT) is performed every two years on people aged between 50
and 69 years. A colonoscopy is then carried out on those who are FIT positive. However, FIT shows
approximately 65% false positives (non-tumoral bleedings), leading to many negative colonoscopies.
The use of an economic and easy-to-use method to check FOBT-positives will improve screening
effectiveness, reducing costs to the national health service. This work illustrates the results of a
three-year clinical validation protocol (started in 2016) of a patented device composed of a core of
nanostructured gas sensors. This device was designed to identify CRC presence by fecal volatile
compounds, with a non-invasive, in vitro and low-cost analysis. Feces are, in fact, affected by
tumor-volatile biomarkers, produced by cellular peroxidation and metabolic alterations. The protocol
consisted in the analysis of fecal samples of FIT-positive subjects, using colonoscopy as a gold standard.
A total of 398 samples were analyzed with machine learning techniques, leading to a sensitivity and
specificity of 84.1% and 82.4%, respectively, and a positive predictive value of 72% (25–35% for FIT)
Influência da adubação na produção e eficiência da nodulação de leguminosas anuais de estação fria.
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