Emergency department Nurses' narratives of burnout: Changing roles and boundaries.

Purpose: Emergency department nurses work in rapidly changing environments, which can contribute to occupational stress. Emergency department nurses utilise diverse strategies to mediate the impact of stress on their daily lives. There is a paucity of qualitative research which explores emergency department nurses' experiences and perspectives of burnout.

Ungulate management in European national parks: Why a more integrated European policy is needed.

1. Primary objectives of national parks usually include both, the protection of natural processes and species conservation. When these objectives conflict, as occurs because of the cascading effects of large mammals (i.

Effect of Conditioner Type and Downforce, and Pad Surface Micro-Texture on SiO Chemical Mechanical Planarization Performance.

Based on a previous work where we investigated the effect of conditioner type and downforce on the evolution of pad surface micro-texture during break-in, we have chosen certain break-in conditions to carry out subsequent blanket SiO wafer polishing studies. Two different conditioner discs were used in conjunction with up to two different conditioning downforces. For each disc-downforce combination, mini-marathons were run using SiO wafers.

Dispersion compensation for an integrated optic grating coupler utilizing a transmission volume hologram.

In this paper we show the analysis and experimental results of using a volume holographic grating to increase the wavelength bandwidth over which light is coupled into a thin-film optical waveguide. Partial matching of the dispersion relationships of a hologram fabricated in dichromated gelatin with a waveguide/grating coupler etched in glass, show an increase in the full-width half-maximum wavelength (FWHM) bandwidth from approximately 0.25 nm to greater than 5 nm.

Reducing alignment and chromatic sensitivity of holographic optical interconnects with substrate-mode holograms.

The alignment and chromatic sensitivity of holographic optical elements for use in optical interconnect systems are quantified. The effects of these image degrading parameters are related to the frequency and power requirements for CMOS compatible detectors in an optical interconnect system. Techniques for reducing the magnitude of these problems with substrate-mode holograms are described, and experimental results demonstrating these designs are presented.

Expression of an alternative nitrogen fixation system in Azotobacter vinelandii.

Nitrogenase activities were determined from maximum acetylene reduction rates for mutant strains of Azotobacter vinelandii which are unable to fix N2 in the presence of molybdenum (Nif-) but undergo phenotypic reversal to Nif+ under conditions of Mo deficiency. The system responsible for N2 fixation under these conditions is thought to be an alternative N2 fixation system (Bishop et al., Proc.

Evidence for an alternative nitrogen fixation system in Azotobacter vinelandii.

Two Azotobacter vinelandii strains capable of growing on N2(Nif+) were isolated from two different mutant strains that lacked dinitrogenase activity (Nif-). Extracts of N2-grown cells of the two Nif+ strains lacked significant amounts of the "conventional" dinitrogenase protein subunits, as determined by two-dimensional gel electrophoresis. Instead, the extracts contained at least four new proteins that appeared to be ammonia-repressible (i.

Echocardiographic comparison of haemodynamic effects of metoprolol and propranolol.

Metoprolol (200 mg daily) and propranolol (160 mg daily) were each given for one week to 11 normal subjects. The order of administration was randomized and not known to us during the study. Each period of treatment with active drug was followed by one week during which placebo tablets were taken.