A non-aqueous capillary electrophoretic method developed with quinine and tert.-butyl carbamoylated quinine as chiral selectors for the enantioseparation of N-protected amino acids was applied to the investigation of other quinine derivatives as chiral additives. The optimum composition of the background electrolyte was found to be 12.5 mM ammonia, 100 mM octanoic acid and 10 mM chiral selector...

A key aspect of determination--the acquisition and propagation of cell fates--is the initiation of patterns of selector gene expression and their maintenance in groups of cells as they divide and develop. In Drosophila, in those groups of cells where particular selector genes must remain inactive, it is the Polycomb-Group of genes that keep them silenced. Here we show that M33, a mouse homologu...

There is a significantly greater post-Cambrian decline in frequency of ordinal origination among serially constructed Bilateria, such as arthropods, than in nonserially constructed Bilateria. Greater decline in arthropod ordinal origination is not predicted by ecologic, diversity-dependent models of decline in the production of higher taxa. Reduction in ordinal origination indicates increased c...

This paper describes a generic, knowledge-based mechanism used to make selections between a xed set of alternatives. The mechanism, termed sponsor-selector has been used as a control mechanism in a number of diierent knowledge-based systems including design, planning and problem-solver integration applications. We will discuss the general applicability of the sponsor-selector mechanism and desc...

Meta-data annotations and AOP are a powerful combination. Several aspect-oriented languages already support the use of annotations as a selection criterion in pointcut designators. Some languages also support the introduction of annotations using aspect-oriented techniques. This paper describes a combination of these techniques as they are implemented in Compose*, our aspect-oriented language. ...

A radial basis function (RBF) neural network approach with a fusion of multiple signal candidates in precision motion control is studied in this paper. Sensor weightages are assigned to sensor measurements according to the selector attributes and are approximated using RBF neural network in multi-sensor fusion. A specific application towards precision motion control of a linear motor system usi...

Regression problems under Poisson variability arise in many different scientific areas such as, for examples, astrophysics and medical imaging. This article considers the problem of bandwidth selection for kernel smoothing of Poisson data. Its first contribution is the proposal of a new bandwidth selectionmethod that aims to choose the bandwidth thatminimizes theKullback–Leibler (KL)distance be...

Abstract While there exist many bandwidth selectors for estimation, selection statistical matching and prediction has hardly been studied so far. We introduce a computationally attractive selector nonparametric out-of-sample problems like data matching, impact evaluation, scenario simulations or imputing missings. Even though the method is bootstrap based, we can derive closed expressions crite...

We provide a general framework to remove short advice by formulating the following computational task for a function f : given two oracles at least one of which is honest (i.e. correctly computes f on all inputs) as well as an input, the task is to compute f on the input with the help of the oracles by a probabilistic polynomial-time machine, which we shall call a selector. We characterize the ...

Selector genes modify developmental pathways to sculpt animal body parts. Although body parts differ in size, the ways in which selector genes create size differences are unknown. We have studied how the Drosophila Hox gene Ultrabithorax (Ubx) limits the size of the haltere, which, by the end of larval development, has approximately fivefold fewer cells than the wing. We find that Ubx controls ...