1,761 research outputs found
The Effect of Light Conditions On Interpreting Oil Composition Engineering in \u3ci\u3eArabidopsis\u3c/i\u3e Seeds
Arabidopsis thaliana is the most developed and utilized model plant. In particular, it is an excellent model for proofâofâconcept seed oil engineering studies because it accumulates approximately 37% seed oil by weight, and it is closely related to important Brassicaceae oilseed crops. Arabidopsis can be grown under a wide variety of conditions including continuous light; however, the amount of light is strongly correlated with total seed oil accumulation. In addition, many attempts to engineer novel seed oil fatty acid compositions in Arabidopsis have reported significant reductions in oil accumulation; however, the relative reduction from the nontransgenic controls varies greatly within the literature. A set of experiments were conducted to systematically analyze the effect of light conditions (including day/night cycle vs. continuous light, and different light intensities) on the relative accumulation of seed oil between three different transgenic lines producing novel hydroxy fatty acids and their nontransgenic background. Oil content was measured per seed and as a percentage of seed weight. Our results indicate the relative amount of seed oil between transgenic lines and nontransgenic controls is dependent on both the light conditions and the type of oil content measurement utilized. In addition, the light conditions effect the relative accumulation of the novel fatty acids between various transgenic lines. Therefore, the success of novel fatty acid proofâofâconcept engineering strategies on both oil accumulation and fatty acid composition in Arabidopsis seeds should be considered in light of the select growth and measurement conditions prior to moving engineering strategies into crop plants
Tunneling between two systems of interacting chiral fermions
We develop a theory of tunneling between two systems of spinless chiral
fermions. This setup can be realized at the edge of a quantum Hall bilayer
structure. We find that the differential conductance of such a device in the
absence of interactions has an infinitely sharp peak as a function of applied
voltage. Interaction between fermions results in broadening of the conductance
peak. We focus on the regime of strong interactions, in which the shape of the
peak manifests well defined features associated with the elementary excitations
of the system.Comment: 12 page
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