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Mostrando ítems 671-680 de 964
Artículo
The NtcA-regulated amtB gene is necessary for full methylammonium uptake activity in the cyanobacterium Synechococcus elongatus
(American Society for Microbiology, 2007)
The Amt proteins constitute a ubiquitous family of transmembrane ammonia channels that permit the net uptake of ammonium by cells. In many organisms, there is more than one amt gene, and these genes are subjected to nitrogen ...
Artículo
On minimax-regret Huff location models
(Elsevier, 2011-01)
We address the following single-facility location problem: a firm is entering into a market by locating one facility in a region of the plane. The demand captured from each user by the facility will be proportional to the ...
Artículo
In vitro release testing of matrices based on starch-methyl methacrylate copolymers: Effect of tablet crushing force, dissolution medium pH and stirring rate
(Elsevier, 2014-01-30)
Direct-compressed matrix tablets were obtained from a variety of potato starch-methyl methacrylate copolymers1 as sustained-release agents, using anhydrous theophylline as a model drug. The aim of this work was to investigate ...
Artículo
El dominio del comportamiento como base del significado en psicología
(Universidad Veracruzana y Universidad Nacional Autónoma de México, 1992)
Como instrumento metodológico se propone un esquema de análisis que, reconociendo el papel pionero del conductismo radical, pretende ser generalizable a cualquier forma no mentalista de concebir el objeto de estudio ...
Artículo
Implanted neural progenitor cells regulate glial reaction to brain injury and establish gap junctions with host glial cells
(Wiley-Blackwell, 2014)
Transplantation of neural stem/progenitor cells (NPCs) in the lesioned brain is able to restore morphological and physiological alterations induced by different injuries. The local microenvironment created at the site of ...
Artículo
Characterization of Bluetooth Packet Delay in Noisy Environments
(IEEE Computer Society, 2009)
This letter presents an analytical model to compute the delay of Bluetooth transmissions with Serial Port Profile (SPP) when interferences cause packet retransmissions. In particular, the model takes into consideration ...
Ponencia
QuEF: An environment for the assesment of MDWE methodologies
(Universidad de Oporto, 2010)
This paper presents QuEF (Quality Evaluation Framework), an environment for the assesment of Model-Driven Web Engineering (MDWE) methodologies. This approach is oriented to evaluate, through objectives measures, the ...
Artículo
Molding with nanoparticle-based one-dimensional photonic crystals: A route to flexible and transferable Bragg mirrors of high dielectric contrast
(Royal Society of Chemistry (Great Britain), 2009)
Self-standing, flexible Bragg mirror films of high refractive index contrast and showing intense and wide Bragg peaks are herein presented. Nanoparticle-based one-dimensional photonic crystals are used as templates to ...
Artículo
Invariant means and thin sets in harmonic analysis with applications to prime numbers
(Wiley, 2009-08)
We first prove a localization principle characterising Lust-Piquard sets. We obtain that the union of two Lust-Piquard sets is a Lust-Piquard set, provided that one of these two sets is closed for the Bohr topology. We ...
Artículo
Cellular covers of local groups
(Springer, 2018-12)
We prove that, in the category of groups, the composition of a cellularization and a localization functor need not be idempotent. This provides a negative answer to a question of Emmanuel Dror Farjoun.