The aims of this study are the isolation and identification of possible bacteriological agents in respiratory infections of calves and the optimization of a diagnostic protocol to identify Arcanobacterium haemolyticum. Lesions of lungs from calves with pneumonia were examined. Cultural, morphological and conventional biochemical testing were done. The investigation was complemented by the double CAMP test. Five strains of Arcanobacterium haemolyticum in pure culture were found. The presence of Arcanobacterium haemolyticum in the lungs of calves with pneumonia was established and, consequently, more attention should be paid to this species in everyday laboratory work. The cultural similarity of Arcanobacterium haemolyticum to common bacteria like beta-hemolytic Streptococcus spp. and Arcanobacterium pyogenes is probably responsible for rare reports on the isolation of Arcanobacterium haemolyticum in veterinary microbiology. Our results indicate that Arcanobacterium haemolyticum could be or is the etiological agent of pneumonia. Therefore, we suggest the diagnostic protocol available for routine work in most microbiological laboratories. [Projekat Ministarstva nauke Republike Srbije, br. 41012]

Despite the complexity of the Human Visual System (HVS), research over the last few decades has highlighted a number of its limitations. These limitations can be exploited in computer graphics to significantly reduce computational cost and thus required rendering time, without a viewer perceiving any difference in resultant image quality. Furthermore, crossmodal interaction between different modalities, such as the influence of audio on visual perception, has also been shown as significant both in psychology and computer graphics. In this paper we investigate the effect of beat rate on temporal visual perception, i.e. frame rate perception. For the visual quality and perception evaluation, a series of psychophysical experiments was conducted and the data analysed. The results indicate that beat rates in some cases do affect temporal visual perception and that certain beat rates can be used in order to reduce the amount of rendering required to achieve a perceptual high quality. This is another step towards a comprehensive understanding of auditory-visual crossmodal interaction and could be potentially used in highfidelity interactive multi-sensory virtual environments.