BACKGROUND Clinical officers (COs), a mid-level cadre of health worker, are the backbone of healthcare provision in rural Kenya. However, the vacancy rate for COs in rural primary healthcare facilities is high. Little is known about factors motivating COs' preferences for rural postings. METHODS A discrete choice experiment (DCE) questionnaire was used with 57 COs at public health facilities ...

Chi (5'-GCTGGTGG) is a recombinator in RecA-RecBC-mediated recombination in Escherichia coli. In bacteriophage lambda vegetative recombination, Chi is fully active only when it is correctly oriented with respect to cos, the site that defines the ends of the packaged chromosome. Here we demonstrate that packaging from cos is not necessary for this cos-Chi interaction. Our evidence suggests that ...

The response of a cell in the primary visual cortex to an optimally oriented grating is suppressed by a superimposed orthogonal grating. This cross-orientation suppression (COS) is exhibited when the orthogonal and optimal stimuli are presented to the same eye (monoptically) or to different eyes (dichoptically). A recent study suggested that monoptic COS arises from subcortical processes; howev...

A new family of very fast stream ciphers called COS (for “crossing over system”) has been proposed by Filiol and Fontaine, and seems to have been adopted for at least one commercial standard. In this note we show that the COS ciphers are very weak indeed — it requires negligible effort to reconstruct the state of the keystream generator from a very small amount of known keystream.

In this paper we present the design and implementation of a system that exploits well-known design patterns to facilitate construction of an extensible system for comparison and visualization of ordering methodologies for class-based testing of C++ applications. Using our implementation, we present a comparative study and evaluation of two advanced ordering methodologies: the edge based approac...

Carbonyl sulfide (COS) is a promising tracer for partitioning terrestrial photosynthesis and respiration from net carbon fluxes, based on its daytime co-uptake alongside CO2 through leaf stomata. Because ecosystem COS fluxes are the sum of plant and soil fluxes, using COS as a photosynthesis tracer requires accurate knowledge of soil COS fluxes. At an oak woodland in Southern California, we mon...

in this study, in order to facilitate and accelerate the production of eukaryotic protein alpha 1-antitrypsin (aat) with correct post-translational modifications, a protein production system based on the transduction of cho and cos-7 cells using lentiviral vectors was developed. human aat cdna was cloned into a replication-defective lentiviral vector. the transgene aat-jred chimer was transferr...

Exercice 1. Factorisation de X − 1 Factoriser X − 1 sur C. 1) En déduire ∏n−1 k=1 sin( kπ n ). 2) Calculer également ∏n−1 k=0 sin( kπ n + θ). 3) On note ω = e2iπ/n. Calculer ∏ k 6=`, k,`∈[0,n−1](ω − ω). Exercice 2. Mines MP 1999 Montrer que ∏n−1 k=0(ω − 2ω cos θ + 1) = 2(1− cos(nθ)) pour ω = e2iπ/n. Exercice 3. Racines de j et j2 Montrer que si p 6 n, alors X2p +X2 + 1 divise X2n +X2 + 1. Exerc...

Now, let (u, v) = Rα(θ, φ′). Here, Rα = Ry(α). We omit the z rotation since that does not affect Yl0 which has no azimuthal dependence. The vector corresponding to coordinates (u, v) is then given by   sinu cos v sinu sin v cos u   =   cosα 0 sinα 0 1 0 − sinα 0 cosα     sin θ′ cosφ′ sin θ′ sinφ′ cos θ′   =   cosα sin θ′ cosφ′ + sinα cos θ′ sin θ′ sinφ′ cosα cos θ′ + sinα sin θ′ (...