262 research outputs found
Regeneration of begonia plantlets by direct organogenesis
The economic importance of ornamentals worldwide suggests a bright future for ornamental breeding. Rapid progress in plant molecular biology has great potentials to contribute to the breeding of novel ornamental plants utilizing recombinant DNA technology. The plant cell, tissue or organ culture of many ornamental species and their regeneration are essential for providing the material and systems for their genetic manipulation, and this is therefore the first requirement of genetic engineering. In this research, different concentration of BA (0.0, 0.5, 1.0, 2.0 mgl(-1) with NAA ( 0.0, 0.5, 1.0 mgl(-1)) and BA (0.0, 0.5, 1.0, 2.0 mgl(-1)) with IAA ( 0.0, 0.5, 1.0, mgl(-1)) were investigated to optimize regeneration of Begonia elatior cv. Toran orange. The best regeneration and growth were obtained from the media containing 2.0 mgl(-1) BA and 1.0 mgl(-1) NAA (70%) followed by 1.0 mgl(-1) BA and 0.5 mgl(-1) NAA (50%), 1.0 mgl(-1) BA and 1.0 mgl(-1) NAA (20%) in BA - NAA combination. The media with BA - IAA combination showed that the best regeneration was 0.5 mgl(-1) BA and 0.5 mgl(-1) IAA (43%) followed by 0.5 mgl(-1) BA and 1.0 mgl(-1) IAA (23%)
Multi-objective variational curves
Riemannian cubics in tension are critical points of the linear combination of
two objective functionals, namely the squared norms of the velocity and
acceleration of a curve on a Riemannian manifold. We view this variational
problem of finding a curve as a multi-objective optimization problem and
construct the Pareto fronts for some given instances where the manifold is a
sphere and where the manifold is a torus. The Pareto front for the curves on
the torus turns out to be particularly interesting: the front is disconnected
and it reveals two distinct Riemannian cubics with the same boundary data,
which is the first known nontrivial instance of this kind. We also discuss some
convexity conditions involving the Pareto fronts for curves on general
Riemannian manifolds
A primal--dual algorithm as applied to optimal control problems
We propose a primal--dual technique that applies to infinite dimensional
equality constrained problems, in particular those arising from optimal
control. As an application of our general framework, we solve a
control-constrained double integrator optimal control problem and the
challenging control-constrained free flying robot optimal control problem by
means of our primal--dual scheme. The algorithm we use is an
epsilon-subgradient method that can also be interpreted as a penalty function
method. We provide extensive comparisons of our approach with a traditional
numerical approach
A note on the effect of pre-slaughter transport duration on nutrient composition and fatty acid profile of broiler breast meat.
WOS: 00029493340000
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