22,991 research outputs found
Tactical urbanism as a catalyst for democratic urban spaces
PonĂšncia presentada a: Session 8: Dimensiones psicosociales de la arquitectura y el urbanismo / Psycological dimensions of architecture and plannin
CP-Odd Phase Effects in a Left-Right Symmetric Chargino Sector
The left-right supersymmetric model contains a right-handed gaugino, as well
as several higgsinos, in addition to the minimal supersymmetric model. Thus
several CP-noninvariant phases appear in this sector. We analyze their impact
on chargino masses and find that only two combinations are physically relevant.
We then study the production of charginos in e+e- annihilation and chargino
decays into a sneutrino and a lepton, and investigate the effects of CP-phases.
We also study the CP-odd asymmetry in the production and subsequent decay at
the linear collider with longitudinally polarized beams and find a large
enhancement when the decay channel to the right sneutrino is available. The
effects of the phases in the left-right supersymmetric chargino sector are
different from the minimal supersymmetric standard model, and signals from this
sector would be able to distinguish between different gauge symmetries.Comment: 24 pages, 11 figures, minor clarifications in the model part, to be
published in Phys. Rev.
Diffraction Resistant Scalar Beams Generated by a Parabolic Reflector and a Source of Spherical Waves
In this work, we propose the generation of diffraction resistant beams by
using a parabolic reflector and a source of spherical waves positioned at a
point slightly displaced from its focus (away from the reflector). In our
analysis, considering the reflector dimensions much greater than the
wavelength, we describe the main characteristics of the resulting beams,
showing their properties of resistance to the diffraction effects. Due to its
simplicity, this method may be an interesting alternative for the generation of
long range diffraction resistant waves.Comment: 22 pages, 9 figures, Applied Optics, 201
Metabolomic analysis by UAE-GC MS and antioxidant activity of <i>Salvia hispanica </i>(L.) seeds grown under different irrigation regimes
Chia (Salvia hispanica L.) is an emerging crop with a high content of α-linolenic acid and metabolites of industrial and pharmaceutical interest but information on metabolome variations in response to agricultural management is scarce. We investigated the yield and metabolic profile of the seeds of two chia populations, one commercial black (B) and one long-day flowering genotype (G8), in response to two irrigation levels: replacement of 100% ETâ 0 (I) or rainfed (NI). Seed yield was higher in irrigated plots in G8 only (0.255kgmâ â2 for I vs 0.184kgmâ â2 for NI) while it was very low regardless of irrigation in B due to late flowering. Ultrasound assisted extraction (UAE) of seeds followed by gas chromatography-mass spectrometry (GC/MS) analysis showed differences in fatty acids and the major classes of organic compounds due to both genotype and irrigation, especially in the non-polar phase where irrigated samples showed a higher content of α-linolenic and other fatty acids and a lower oleic/linoleic ratio (47.4 in NI vs. 39.6 in I). The antioxidant activity, expressed as trolox equivalent antioxidant capacity (TEAC), ranged from 1.317±0.027 to 2.174±0.010mmol TEAC/g of defatted chia seed after 2 and 40min respectively, and was negatively affected by irrigation. The total polyphenolic content (TPC) measured with the Folin-Ciocalteu method, also decreased with irrigation. According to our results irrigation can affect chia yield, metabolome and antioxidant behavior but some of the effects are genotype-dependent
Metabolomics driven analysis by UAEGC-MS and antioxidant activity of Chia (<i>Salvia hispanica </i>L.) commercial and mutant seeds
Chia is a food plant producing seeds which have seen increasing interest owing to their health benefits. This work is the first report on the metabolite profile, total polyphenols and antioxidant activity of chia seeds, determined by ultrasound-assisted extraction, coupled with gas chromatography-mass spectrometry (UAE GC-MS). Different chia sources were compared: two commercial (black and white) and three early flowering (G3, G8 and G17) mutant genotypes. Organic extracts were mainly composed of mono- and polyunsaturated fatty acids with alpha-linolenic being the most abundant. Polar extracts contained sucrose, methylgalactoside and glucose as main sugars. Antioxidant activity and total polyphenolic content were correlated. Chemical composition and yield potential of early flowering genotypes were different from commercial chia, and while white chia showed the highest content of omega-3 fatty acids, the high content of nutraceuticals in G17 and G8 suggests them as a potential source of raw materials for the food/feed industry
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