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Now showing items 151-160 of 233
Consolidating rural school districts: Potential savings and effects on student achievement
(Cambridge University Press, 2000-12)
One frequently proposed policy is to consolidate rural school districts in order to save money by obtaining economies of size. The effects of school district size on both expenditures and standardized test scores are ...
Long-ranged attraction between charged polystyrene spheres at aqueous interfaces
(American Physical Society, 2005-11-15)
We report an optical and atomic force microscopic study of interactions between charged polystyrene spheres at a water-air interface. Optical observations of bonded particle clusters and formation of circular chainlike ...
Negative Subtraction Hybridization: An efficient method to isolate large numbers of condition-specific cDNAs
(BioMed Central, 2004-03-29)
Background: The construction of cDNA libraries is a useful tool to understand gene expression in organisms under different conditions, but random sequencing of unbiased cDNA collections is laborious and can give rise to ...
Resonant terahertz transmission in plasmonic arrays of subwavelength holes
(EDP Sciences, 2008-07-04)
A review of transmission properties of two-dimensional plasmonic structures in the terahertz regime is presented. Resonant terahertz transmission was demonstrated in arrays of subwavelength holes patterned on both metals ...
Quantum correlations between a pair of Raman photons from a single atom under arbitrary excitation condition
(American Physical Society, 2005-10-19)
The quantum correlation between a pair of Stokes and anti-Stokes photons, involving a Raman emission process is calculated. All realistic radiative and nonradiative decays are included in the calculation and the photon ...
Survey of DNA motif finding algorithms
(BioMed Central, 2007-11-01)
Background: Unraveling the mechanisms that regulate gene expression is a major challenge in biology. An important task in this challenge is to identify regulatory elements, especially the binding sites in deoxyribonucleic ...
Phylogeographic analysis reveals association of tick-borne pathogen, Anaplasma marginale, MSP1a sequences with ecological traits affecting tick vector performance
(BioMed Central, 2009-09-01)
Background: The tick-borne pathogen Anaplasma marginale, which is endemic worldwide, is the type species of the genus Anaplasma (Rickettsiales: Anaplasmataceae). Rhipicephalus (Boophilus) microplus is the most important ...
Part-per-million gas detection from long-baseline THz spectroscopy
(AIP Publishing, 2004-09-13)
We report a long-baseline THz time domain spectrometer based on a White cell design capable of detecting gas species in the low part-per-million range in near real time. Coherent transients from methyl chloride vapor are ...
Exposure to citral, cinnamon and ruda disrupts the life cycle of a vector of Chagas disease
(Science Publications, 2007)
The main vector of Chagas disease in Venezuela was exposed to the odors of citral, cinnamon and ruda. Cinnamon was found to stop the life cycle of Rhodnius prolixus relative to untreated animals. Citral and ruda also ...
Using both sociological and economic incentives to reduce moral hazard
(Western Agricultural Economics Association, 2003-08)
Economists tend to focus on monetary incentives. In the model developed here, both sociological and economic incentives are used to diminish the apparent moral hazard problem existing in commodity grading. Training that ...