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In this study, an electrochemical sensor based on carbon nanotube immobilized with diester-functionalized calix[4]arene (CNT-Calix-DE) was developed to determine the ondansetron content in pharmaceutical preparations. During the sensor preparation stage, the glassy carbon electrode surface was modified with CNT-Calix-DE. The surface morphology, electrochemical characterization and analytical performance of the sensor were examined using scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS) and differential pulse anodic stripping voltammetry (DPASV). Under optimal experimental conditions, the developed sensor showed a linear response to ondansetron in the concentration range of 1.0-10.0 M. Analytical applicability of the sensor was investigated by determination of ondansetron in pharmaceutical preparations. [ABSTRACT FROM AUTHOR]

In the study, the micromorphology of labellum in samples belonging to 10 different Ophrys taxa was examined by Scanning Electron Microscopy (SEM) method and the results were presented in comparative tables. While the samples were collected from the field, they were taken to 70% alcohol, some of them were dried according to the herbarium rules and identified. The labellum samples extracted from alcohol were dissected under the stereomicroscope with scalpel and needles and placed directly into the iron apparatus of the SEM device with double-sided adhesive tapes. These samples, whose alcohol was completely evaporated by waiting for one night, were examined directly with Scanning Electron Microscope (SEM) and labellum microphotographs were taken. According to our findings, it was determined that the speculum structures are very different from each other, and the shape and distribution of the hair / papilla in the basal, median and lateral regions differ from species to species.It was also determined that the apex region differs in O. fusca, O. lutea, O. speculum, O. mammosa, O. pseudomammosa, O. heldreichii, O. umbilicata, and O. holoserica species. In summary; It was concluded that the labellum speculum and apex structure of the 1st degree and the basal, median and lateral region surface characteristics of the 2nd degree differ widely between the species. [ABSTRACT FROM AUTHOR]