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  • Article
    Hošek J, Novotná R, Babula P, Vančo J, Trávníček Z.
    PLoS One. 2013;8(6):e65214.
    Kinetin (N6-furfuryladenine) belongs to a group of plant growth hormones involved in cell division, differentiation and other physiological processes. One of the possible ways to obtain biologically active compounds is to complex biologically relevant natural compounds to suitable metal atoms. In this work, two structural groups of Zn(II) complexes [Zn(L(n))2Cl2]·Solv (1-5) and [Zn(HL(n))Cl3] · xL(n) (6-7); n=1-5, Solv=CH3OH for 1 and 2H2O for 2; x =1 for 6 and 2 for 7; involving a phytohormone kinetin and its derivatives (L(n)) were evaluated for their ability to modulate secretion of tumour necrosis factor (TNF)-α, interleukin (IL)-1β and matrix metalloproteinase (MMP)-2 in a lipopolysaccharide (LPS)-activated macrophage-like THP-1 cell model. The penetration of the complexes to cells was also detected. The mechanism of interactions of the zinc(II) complexes with a fluorescent sensor N-(6-methoxy-8-quinolyl)-p-toluene sulphonamide (TSQ) and sulfur-containing biomolecules (l-cysteine and reduced glutathione) was studied by electrospray-ionization mass spectrometry and flow-injection analysis with fluorescence detection. The present study showed that the tested complexes exhibited a low cytotoxic effect on the THP-1 cell line (IC50>40 µM), apart from complex 4, with an IC50=10.9 ± 1.1 µM. Regarding the inflammation-related processes, the Zn(II) complexes significantly decreased IL-1β production by a factor of 1.47-2.22 compared with the control (DMSO), but did not affect TNF-α and MMP-2 secretions. However, application of the Zn(II) complexes noticeably changed the pro-MMP-2/MMP-2 ratio towards a higher amount of maturated MMP-2, when they induced a 4-times higher production of maturated MMP-2 in comparison with the vehicle-treated cells under LPS stimulation. These results indicated that the complexes are able to modulate an inflammatory response by influencing secretion and activity of several inflammation-related cytokines and enzymes.
    Digital Access Access Options
  • Article
    Freeman E, Wang CY, Sumaria V, Schiff SJ, Liu Z, Tadigadapa S.
    AIP Adv. 2018 Jun;8(6):065214.
    A whispering gallery mode resonator based magnetometer using chip-scale glass microspherical shells is described. A neodynium micro-magnet is elastically coupled and integrated on top of the microspherical shell structure that enables transduction of the magnetic force experienced by the magnet in external magnetic fields into an optical resonance frequency shift. High quality factor optical microspherical shell resonators with ultra-smooth surfaces have been successfully fabricated and integrated with magnets to achieve Q-factors of greater than 1.1 × 107 and have shown a resonance shift of 1.43 GHz/mT (or 4.0 pm/mT) at 760 nm wavelength. The main mode of action is mechanical deformation of the microbubble with a minor contribution from the photoelastic effect. An experimental limit of detection of 60 nT Hz-1/2 at 100 Hz is demonstrated. A theoretical thermorefractive limited detection limit of 52 pT Hz-1/2 at 100 Hz is calculated from the experimentally derived sensitivity. The paper describes the mode of action, sensitivity and limit of detection is evaluated for the chip-scale whispering gallery mode magnetometer.
    Digital Access Access Options
  • Book
    edited by Axel Fliethmann, Christiane Weller.
    Summary: "This volume addresses the interdependencies between visual technologies and epistemology with regard to our perception of the medical body. It explores the relationships between the imagination, the body, and concrete forms of visual representations: Ranging from the Renaissance paradigm of anatomy, to Foucault's "birth of the clinic" and the institutionalised construction of a "medical gaze"; from "visual" archives of madness, psychiatric art collections, the politicisation and economisation of the body, to the post-human in mass media representations. Contributions to this volume investigate medical bodies as historical, technological, and political constructs, constituted where knowledge formation and visual cultures intersect. Contributors are: Axel Fliethmann, Michael Hau, Birgit Lang, Carolyn Lau, Heikki Lempa, Stefanie Lenk, Joanna Madloch, Barry Murnane, Jill Redner, Claudia Stein, Elizabeth Stephens, Corinna Wagner, and Christiane Weller"-- Provided by publisher.
    Access via Clio medica (Amsterdam, Netherlands) ; 2021; 104.
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    Clio medica (Amsterdam, Netherlands) ; 2021; 104.
    2021