8,564 research outputs found

    Solving Potential Scattering Equations without Partial Wave Decomposition

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    Considering two-body integral equations we show how they can be dimensionally reduced by integrating exactly over the azimuthal angle of the intermediate momentum. Numerical solution of the resulting equation is feasible without employing a partial-wave expansion. We illustrate this procedure for the Bethe-Salpeter equation for pion-nucleon scattering and give explicit details for the one-nucleon-exchange term in the potential. Finally, we show how this method can be applied to pion photoproduction from the nucleon with πN\pi N rescattering being treated so as to maintain unitarity to first order in the electromagnetic coupling. The procedure for removing the azimuthal angle dependence becomes increasingly complex as the spin of the particles involved increases.Comment: 15 pages, 4 figure

    Effect of Performance Appraisal System on Employee Productivity;(Selected Public Senior High Schools, Ho Municipality, Ghana)

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    Performance appraisals improve the work performance of employees by helping them realize their full potentials in carrying out their firm's mission and also, to provide information to employees and managers for use in making work-related decisions. They, also, provide feedback to employees and thereby serve as a vehicle for personal and career development. Performance appraisals, however, are beset with difficulties as a result of their complex nature. The general objective of the study, therefore, was to evaluate the performance appraisal system and its effect on employee productivity (performance) at the Ghana Education Service (GES). The research design used in the study was the descriptive study because it was appropriate for the achievement of the research objectives. The population for the study was 153 and a sample size of 108 respondents was selected using the probability and non-probability sampling method. Interview and questionnaires were used as instruments for the study and out of 106 questionnaires distributed, all of them were retrieved from respondents and interview conducted for two respondents. The data was analyzed with tables, bar charts. Among the main findings of the study was that the GES only carried out performance appraisal when teachers were due for promotion. The finding indicated a negative relationship between performance appraisal and productivity of teachers. It means that performance appraisal has no link with the WASSCE results. The study recommends that the Ghana Education Service should adopt performance apprnaisal that is tailored to the job description and the job analysis, that is, there should be a clear cut policy on the conduct of performance appraisal in the GES in order to improve on its conduct. Keywords: High School, Productivity, Appraisal, Performance, Employee DOI: 10.7176/JESD/12-2-01 Publication date: January 31st 202

    Theory of collision-induced translation-rotation spectra: H2-He

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    This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.29.595.An adiabatic quantal theory of spectral line shapes in collision-induced absorption and emission is presented which incorporates the induced translation-rotation and translation-vibration spectra. The generalization to account for the anisotropy of the scattering potential is given. Calculations are carried out of the collision-induced absorption spectra of He in collisions with H2 with ab initio electric dipole functions and realistic potentials. The anisotropy of the interaction potential is small and is not included in the calculations. The predicted spectra are in satisfactory agreement with experimental data though some deviations occur which may be significant. The rotational line shapes have exponential wings and are not Lorentzian. The connection between the quantal and classical theories is written out explicitly for the isotropic overlap induction

    Inhibitors of DNA polymerase III as novel antimicrobial agents against gram-positive eubacteria

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    6-Anilinouracils are selective inhibitors of DNA polymerase III, the enzyme required for the replication of chromosomal DNA in gram-positive bacteria (N. C. Brown, L. W. Dudycz, and G. E. Wright, Drugs Exp. Clin. Res. 12:555-564, 1986). A new class of 6-anilinouracils based on N-3 alkyl substitution of the uracil ring was synthesized and analyzed for activity as inhibitors of the gram-positive bacterial DNA polymerase III and the growth of gram-positive bacterial pathogens. Favorable in vitro properties of N-3-alkyl derivatives prompted the synthesis of derivatives in which the R group at N-3 was replaced with more-hydrophilic methoxyalkyl and hydroxyalkyl groups. These hydroxyalkyl and methoxyalkyl derivatives displayed K(i) values in the range from 0.4 to 2.8 microM against relevant gram-positive bacterial DNA polymerase IIIs and antimicrobial activity with MICs in the range from 0.5 to 15 microg/ml against a broad spectrum of gram-positive bacteria, including methicillin-resistant staphylococci and vancomycin-resistant enterococci. Two of these hydrophilic derivatives displayed protective activity in a simple mouse model of lethal staphylococcal infection

    In vitro antimicrobial activities of novel anilinouracils which selectively inhibit DNA polymerase III of gram-positive bacteria

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    The 6-anilinouracils are novel dGTP analogs that selectively inhibit the replication-specific DNA polymerase III of gram-positive eubacteria. Two specific derivatives, IMAU (6-[3\u27-iodo-4\u27-methylanilino]uracil) and EMAU (6-[3\u27-ethyl-4\u27-methylanilino]uracil), were substituted with either a hydroxybutyl (HB) or a methoxybutyl (MB) group at their N3 positions to produce four agents: HB-EMAU, MB-EMAU, HB-IMAU, and MB-IMAU. These four new agents inhibited Staphylococcus aureus, coagulase-negative staphylococci, Enterococcus faecalis, and Enterococcus faecium. Time-kill assays and broth dilution testing confirmed bactericidal activity. These anilinouracil derivatives represent a novel class of antimicrobials with promising activities against gram-positive bacteria that are resistant to currently available agents, validating replication-specific DNA polymerase III as a new target for antimicrobial development
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