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Preparation and photocatalytic activity of vanadium/silver doped TiO2 thin films obtained by sol-gel method

100%

Nocun M. , Kwasny S.

tom Vol. 42, nr 2

323-336

In our investigation, V/Ag doped TiO2 thin films were prepared on glass substrates. A thin film of SiO2 was prepared as a blocking layer by the dip coating sol-gel technique. A catalytic effect was investigated for obtained samples using Rhodamine B as a probe. Transmittances of the samples were characterized using a UV-VIS spectrophotometer. Subsequently band-gap energy (Eg) was estimated for these films. Chemical composition of the samples was studied by photoelectron spectroscopy (XPS). Powders obtained from sols were characterized by FTIR spectroscopy and X-ray diffraction (XRD).

Synthesis, chemical characterization and antifungal activity of thin layers prepared by sol-gel method

80%

Nocun M. , Zontek J. , Kwasny S.

tom Vol. 42, nr 2

315-322

Sol-gel method was used to prepare SiO2-TiO2 thin layers on the microscope slide glasses with additions of Cu, Ag, Au compounds. The films were calcimined at 150 °C for 1 hour. We studied the morphology of the following samples by scanning electron microscopy (SEM with EDS analysis), and the X-ray photoelectron spectroscopy (XPS). Antifungal properties of the layers were tested with the use of fungi Penicyllium. The results have shown that the best antifungal effect among the examined layers has got the sample with Au ions addition.

Adenosine diphosphate receptors on blood platelets - potential new targets for antiplatelet therapy

80%

Rozalski M. , Nocun M. , Watala C.

nr 2

Platelets play a key role not only in physiological haemostasis, but also under pathological conditions such as thrombosis. Platelet activation may be initiated by a variety of agonists including thrombin, collagen, thromboxane or adenosine diphosphate (ADP). Although ADP is regarded as a weak agonist of blood platelets, it remains an important mediator of platelet activation evoked by other agonists, which induce massive ADP release from dense granules, where it occurs in molar concentrations. Thus, ADP action underlies a positive feedback that facilitates further platelet aggregation and leads to platelet plug formation. Additionally, ADP acts synergistically to other, even weak, agonists such as serotonin, adrenaline or chemokines. Blood platelets express two types of P2Y ADP receptors: P2Y1 and P2Y12. ADP-dependent platelet aggregation is initiated by the P2Y1 receptor, whereas P2Y12 receptor augments the activating signal and promotes platelet release reaction. Stimulation of P2Y12 is also essential for ADP-mediated complete activation of GPIIb-IIIa and GPIa-IIa, and further stabilization of platelet aggregates. The crucial role in blood platelet biology makes P2Y12 an ideal candidate for pharmacological approaches for anti-platelet therapy.