RESUMO
Novel (N-arylamino)phenothiazinium dyes containing meta-substituted-arylamine auxochrome units were successfully obtained by applying a sonochemical protocol designed for a more efficient energy usage in the preparation of methylene blue (MB) analogues. Single crystal X-ray diffraction analysis revealed the spatial arrangement in aggregated crystalline state of (N-(meta-bromoaryl)amino)phenothiazinium dye with minor variances induced by the nature of the halogenide counterion (iodide or chloride). The optical UV-vis properties of the novel (N-arylamino)phenothiazinium dyes were comparable to those of the parent MB, with the longest wavelength absorption maxima situated in the visible range (640-680 nm), large molar extinction coefficients (log ε = 4.5-5.1) and weak solvatochromism in polar solvents. Their fluorescence emission in solid state was evidenced by One Photon Excited Fluorescence Lifetime Imaging (OPE-FLIM) and Two Photon Excited Fluorescence Lifetime Imaging (TPE-FLIM) experiments. Theoretical calculations based on Time Dependent-Density Functional Theory (TD-DFT) at B3PW91 and CAM-B3LYP/def2-SV(P) level of theory predicted absorption and fluorescence emission wavelength maxima in reasonable agreement with experimental data. Computational results suggest that the electronic excitations imply a departure from the planar molecular ground state towards geometrically rearranged excited states disfavoring the vibronic couplings due to a high degree of flexibility induced by the conformational motion of the N-arylamino auxochromes. Preliminary studies regarding the dyes' relevance in biological environment indicated lipophilicity (log P octanol/water 0.5-2.3), no aggregation tendency in diluted solutions in the concentration range 10-50 microM and ability for cytoplasmatic staining of D407 human retinal pigment epithelial cells.
RESUMO
OBJECTIVES: Intentional injury, including interpersonal violence and self-harm, is one of the world's leading causes of preventable injury. In Europe alone, nearly 1.5 million individuals receive medical treatment each year for a violence-related injury. We examined violent injuries treated in the largest Emergency Department (ED) in Tîrgu Mures County, Romania, with a catchment area of approximately 580 000 residents to describe the epidemiology of assault and self-harm injuries. METHODS: Data were collected as part of the European Injury Database project, from a sample of patients who presented with a violence-related injury and received care from the ED of the Mures County Emergency Hospital, Romania. The data were collected for 9 months by two trained emergency physicians. Information about individual demographics; mechanism, nature, place, and activity of injury; injury types, and body regions affected; and discharge state were compared for assault and self-harm injuries. RESULTS: Of the 380 patients treated for violence-related injuries, 88.7% were for assault and 11.3% were for self-harm. For both types of injuries, the majority of patients were between the ages of 15 and 44. Assaults frequently occurred in the home, on streets and highways, or in public places; and men (80.4%) were far more likely than women (19.6%) to be treated for this type of injury; a slightly higher proportion of men (55.8%) than women (44.2%) were treated for self-harm, most of which occurred in homes. DISCUSSION: Of all injuries treated in the Tîrgu Mures ED, one out of five was violence related. One out of 10 patients that suffered an injury as a consequence of a violent event and treated in the ED required admission to a hospital for further medical care, leading to a significant health care burden. These data suggest that prevention strategies should focus on young adults, and particularly men. Interventions that focus on detection and treatment of psychological illness, reduction of alcohol use and associated aggression, and family and intimate partner violence are suggested as priorities.