Temperature programmed desorption (TPD) and reflection absorption infrared spectroscopy (RAIRS) have been used to investigate the interactions between ethyl formate and water and ethyl formate and ethanol in model astrophysical ices adsorbed on a graphitic model grain surface. Experiments show that the ethyl formate forms hydrogen bonds to both water and ethanol via the oxygen lone pairs. This leads to the observation of shifts in the vibrational wavenumber of the C=O and CO -C modes of ethyl formate, which can potentially be used to identify the environment of this complex organic molecule in astronomical observations. TPD data show that the interaction of ethyl formate with water is stronger than that with ethanol, with an additional species being observed in the TPD spectrum corresponding to the desorption of ethyl formate directly bonded to the water ice surface. The desorption energy of ethyl formate adsorbed on water ice was found to be 48.5 kJ mol-1 , compared to 43.2 kJ mol-1 for pure ethyl formate monolayers. Ethyl formate also traps in water ice, and undergoes volcano desorption at the water amorphous to crystalline phase transition temperature. In contrast to the water, ethanol has very little effect on the desorption of ethyl formate, with the two species behaving independently even in a co-deposited ice.
Aims and MethodA survey of 58 patients with alcohol dependence was carried out to ascertain how much knowledge such patients have about the Driver and Vehicle Licensing Agency (DVLA) regulations. Patients completed a questionnaire about whether they follow DVLA regulations, what information health professionals had given to them and whether they would still seek treatment if they knew doctors might inform the DVLA.ResultsThe majority of patients surveyed were continuing to drive. Very few had any knowledge of DVLA regulations regarding alcohol dependence. With the knowledge that doctors have a duty to notify the DVLA in certain circumstances, a significant proportion said they would be less likely to seek treatment or would stop attending for treatment.Clinical ImplicationsHealth professionals may be avoiding discussions of the DVLA regulations with patients suffering from alcohol dependence in an attempt to preserve the doctor–patient relationship.
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