81 research outputs found
Mutagenicity evaluation with Ames test of hydro-alcoholic solution of terpenes
Mutagenic properties of terpenes (both synthesis and plant
derived) have been tested, up to now, as a single molecule.
A terpenes containing hydro-alcoholic solution deriving from
frankincense and myrrh resins and hyssop essential oil was
assayed for mutagenicity by means of Ames test. Extraction tech-
nique conducted with electromagnetic fields at room temperature
enabled to obtain a solution of free active molecules that did
not undergo thermal degradation and characterized by biocidal
activity. In order to verify lack of mutagenic hazard in coming
into contact with human, the solution was appropriately diluted
and tested with Salmonella typhimurium TA98, TA1535 and
YG1024 strains, both in absence and in presence of metabolic
system S9. For none of the tested conditions a 2-fold increase of
induced revertants, as regards to spontaneous, was registered.
The ratio between induced and spontaneous His+ revertants
(Mutagenic Index) was around 1.00 in all the determinations
and no statistically significant differences have been identified
comparing the sample and the negative control. A similar result
has been obtained for the dose-response curve. In conclusion,
we verified that tested terpenes solution lacks of mutagenicity on
Salmonella typhimurium with and without metabolic activator so
this plant extract can be safely used as biocide
"Breathing" rogue wave observed in numerical experiment
Numerical simulations of the recently derived fully nonlinear equations of
motion for weakly three-dimensional water waves [V.P. Ruban, Phys. Rev. E {\bf
71}, 055303(R) (2005)] with quasi-random initial conditions are reported, which
show the spontaneous formation of a single extreme wave on the deep water. This
rogue wave behaves in an oscillating manner and exists for a relatively long
time (many wave periods) without significant change of its maximal amplitude.Comment: 6 pages, 12 figure
Variabilidade espacial dos atributos físicos e químicos de solo e planta na UP Uva para Vinho, Bento Gonçalves, RS.
Tecnologias de agricultura de precisão (AP) são pouco contempladas pelo setor primário para aumentar a qualidade e competitividade do vinho brasileiro. Por isso, esta pesquisa considera várias tecnologias de AP num vinhedo do cv. Merlot, clone 347, UP Uva para Vinho, localizado em Bento Gonçalves, RS. Neste resumo apresentam-se resultados preliminares relacionados à análise da variabilidade espacial dos atributos físicos e químicos de solo e planta, complementando o trabalho de Miele et al. (2011), também apresentado neste workshop. Os dados sugerem haver variabilidade espacial significativa para vários atributos, com boa correlação com as classes taxonômicas de solo (Argissolos, Cambissolos e Neossolos) e, em certos casos, dependência com o manejo realizado no vinhedo. Os próximos passos consistem em afinar a espacialização dos dados e definir métodos adequados de integração
Avaliação de metodologias para estimativa da temperatura do ar para áreas de canola no Rio Grande do Sul.
Orientador: Genei Antonio Dalmago
Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil
The objective of this study was to characterize the variability of spectral reflectance and temporal profiles of vegetation indices
associated with nitrogen fertilization, crop cycle periods, and weather conditions of the growing season in canola canopies in southern Brazil. An
experiment was carried out during the 2013 and 2014 canola growing seasons at EMBRAPA Trigo, Passo Fundo, state of Rio Grande do Sul, Brazil.
The experiment was conducted in a randomized block design with four replications. Five doses of nitrogen top dressing were used as treatments:
10, 20, 40, 80, and 160kg ha-1. Measurements were obtained with the spectroradiometer positioned above the canopy, to construct spectral
reflectance curves for canola and establish temporal profiles for several vegetation indices (SR, NDVI, EVI, SAVI, and GNDVI). In addition, data
on shoot dry matter were obtained and phenological stages were determined. The spectral reflectance curves of canola were reported to change
with canopy growth and development. Temporal profiles of vegetation indices showed two maximum peaks, one before flowering and other after
flowering. The indices SR, NDVI, EVI, SAVI, and GNDVI were able to characterize changes in the canola canopy over time, as a function of
phenological phases, weather conditions, and nitrogen fertilization, throughout the development cycle. Plant growth and development, variations
in crop management, and environmental conditions affect the spectral response of canol
Temperatura de flores e síliquas de canola (Brassica napus L.) durante ocorrência de geada.
Orientador: Genei Antonio Dalmago
NDVI da canola obtido com sensor Green Seeker e calculado a partir de dados hiperespectrais.
Orientador: Genei Antonio Dalmago
Importância de variáveis ambientais na soma térmica de cultivares de trigo.
Orientador: Genei Antonio Dalmago
Comparison between three-dimensional linear and nonlinear tsunami generation models
The modeling of tsunami generation is an essential phase in understanding
tsunamis. For tsunamis generated by underwater earthquakes, it involves the
modeling of the sea bottom motion as well as the resulting motion of the water
above it. A comparison between various models for three-dimensional water
motion, ranging from linear theory to fully nonlinear theory, is performed. It
is found that for most events the linear theory is sufficient. However, in some
cases, more sophisticated theories are needed. Moreover, it is shown that the
passive approach in which the seafloor deformation is simply translated to the
ocean surface is not always equivalent to the active approach in which the
bottom motion is taken into account, even if the deformation is supposed to be
instantaneous.Comment: 39 pages, 16 figures; Accepted to Theoretical and Computational Fluid
Dynamics. Several references have been adde
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