1,501 research outputs found
Ptychographic X-ray computed tomography of extended colloidal networks in food emulsions
As a main structural level in colloidal food materials, extended colloidal
networks are important for texture and rheology. By obtaining the 3D
microstructure of the network, macroscopic mechanical properties of the
material can be inferred. However, this approach is hampered by the lack of
suitable non-destructive 3D imaging techniques with submicron resolution.
We present results of quantitative ptychographic X-ray computed tomography
applied to a palm kernel oil based oil-in-water emulsion. The measurements were
carried out at ambient pressure and temperature. The 3D structure of the
extended colloidal network of fat globules was obtained with a resolution of
around 300 nm. Through image analysis of the network structure, the fat globule
size distribution was computed and compared to previous findings. In further
support, the reconstructed electron density values were within 4% of reference
values.Comment: 19 pages, 4 figures, to be published in Food Structur
Gesture use in social interaction: how speakers' gestures can reflect listeners' thinking.
Spectral signature of short attosecond pulse trains
We report experimental measurements of high-order harmonic spectra generated
in Ar using a carrier-envelope-offset (CEO) stabilized 12 fs, 800nm laser field
and a fraction (less than 10%) of its second harmonic. Additional spectral
peaks are observed between the harmonic peaks, which are due to interferences
between multiple pulses in the train. The position of these peaks varies with
the CEO and their number is directly related to the number of pulses in the
train. An analytical model, as well as numerical simulations, support our
interpretation
Targeted deletion of Hand2 in cardiac neural crest-derived cells influences cardiac gene expression and outflow tract development
AbstractThe basic helix–loop–helix DNA binding protein Hand2 has critical functions in cardiac development both in neural crest-derived and mesoderm-derived structures. Targeted deletion of Hand2 in the neural crest has allowed us to genetically dissect Hand2-dependent defects specifically in outflow tract and cardiac cushion independent of Hand2 functions in mesoderm-derived structures. Targeted deletion of Hand2 in the neural crest results in misalignment of the aortic arch arteries and outflow tract, contributing to development of double outlet right ventricle (DORV) and ventricular septal defects (VSD). These neural crest-derived developmental anomalies are associated with altered expression of Hand2-target genes we have identified by gene profiling. A number of Hand2 direct target genes have been identified using ChIP and ChIP-on-chip analyses. We have identified and validated a number of genes related to cell migration, proliferation/cell cycle and intracellular signaling whose expression is affected by Hand2 deletion in the neural crest and which are associated with development of VSD and DORV. Our data suggest that Hand2 is a multifunctional DNA binding protein affecting expression of target genes associated with a number of functional interactions in neural crest-derived cells required for proper patterning of the outflow tract, generation of the appropriate number of neural crest-derived cells for elongation of the conotruncus and cardiac cushion organization. Our genetic model has made it possible to investigate the molecular genetics of neural crest contributions to outflow tract morphogenesis and cell differentiation
Análise comparativa entre atributos de solos e indivĂduos dE Araucaria angustifolia em sistemas agroflorestais com erva-mate.
Resumo
Micromapeamento de atributos quĂmicos de solos no entorno de indivĂduos de eucalipto sob diferentes idades e situações de melhoramento da fertilidade.
Infraestrutura Nacional de Dados Espaciais: Aspectos Computacionais.
O objetivo deste documento Ă© apresentar os principais conceitos relacionados aos pilares ?tecnologia? e ?padrões?, com enfoque em seus aspectos computacionais. A intenção Ă© sumarizar os fundamentos teĂłricos envolvidos na especificação da INDE e reunir as principais referĂŞncias de softwares open source atualmente disponĂveis e amplamente adotados pela comunidade para a implantação da INDE.bitstream/item/84963/1/COMUN-TECNICO-1-GESTAO-TERRITORIAL-Infraestrut-Nac-Dados-Espac-ed01-2013.pd
- …