Time-frequency representations of signals obtained by the S-transform can be very sensitive to the presence of ?-stable noise. An algorithm for the robust S-transform is introduced. The proposed scheme is based on the L-DFT. The results of conducted numerical analysis show a significantly enhanced performance of the proposed scheme compared to the standard S-transform.

Introduction: Melanoma is a malignant tumor of melanocytes and it is the most malignant tumor of skin and mucous membranes. We do not have any data about incidence and characteristics of skin melanoma in Bosnia and Herzegovina. Aim: We aimed to analyze hospital records on skin melanoma cases from the region of Tuzla during the 5-year period in order to obtain preliminary data about melanoma incidence and clinical characteristics. Patients and methods: This retrospective study included all patients surgically treated at the University Clinical Center Tuzla, from January 2001 to December 2005, who were initially diagnosed with skin melanoma. Results: Most of pathologically verified skin melanoma, disregarding primary tumor (T), were presented in both genders at stage T4 (41.67 %) and T2 (28.33 %). Histological analysis showed that the majority of observed skin melanoma were diagnosed in Clark level III (36.36 %) and Clark level IV (33.33 %) stage. The average tumor thickness of the examined sample, according to Breslow’s classification, was found to be over than 4.0 mm. Conclusion: Our findings are similar to those reported in other countries in the region. Further studies are necessary in order to asses the burden of the disease in the national level. A national melanoma register is of great importance for further surveilance.

The move to filmless is newer easy. It is important to have a vision, and of course to have the right people to implement a complete project. Implementing a picture archiving and communications system and radiology information system is not only about replacing film, but how the technology can improve an organization, its services, and its financial picture. Going filmless provides a prime opportunity to reassess and revitalize the way a center does business.

We study the cohomology of spaces of string links and braids in...   2000 Mathematics Subject Classification. Primary: 57M27; Secondary: 81Q30, 57R40

The aim of this study was to evaluate KCNQ1 K+ channel expression in the frog kidney of Rana esculenta. KCNQ1 K+ channel, also known as KvLQT1, is the pore forming α-subunit of the IKs K+ channel, a delayed rectifier voltage-gated K+ channel, which has an important role in water and salt transport in the kidney and gastrointestinal tract. The expression of KCNQ1 K+ channel along tubular epithelium differs from species to species. In the present study the expression of KCNQ1 K+ channel in the frog kidney has been demonstrated by immunohistochemistry. The presence of KCNQ1 K+ channel was demonstrated in the epithelial cells of distal convoluted tubule and collecting duct. However, the pattern of expression of KCNQ1 K+ channel differs between distal convoluted tubules and collecting duct. All epithelial cells of distal convoluted tubules revealed basolateral expression of KCNQ1 K+ channel. On the contrary, only the single cells of collecting duct, probably intercalated cells, showed diffuse cell surface staining with antibodies against KCNQ1 K+ channel. These findings suggest that KCNQ1 K+ channel has cell-specific roles in renal potassium ion transport.