Graftectomiák a debreceni vesetranszplantációs programban

Absztrakt Bevezetés: A graftectomia indikációja és pontos időzítése bizonyos esetekben vita tárgya, elsősorban a tüneteket nem okozó, már nem működő graftok esetén. Célkitűzés: A szerzők átfogó képet kívántak adni a debreceni veseátültetési programban elvégzett graftectomiákról. Módszer: Retrospektív vizsgálattal elemezték a 2004. január 1. és 2015. december 31. között veseátültetett betegek adatait. Áttekintették a graftectomiák indikációit, időzítését, szövődményeit, továbbá összehasonlították a korai és késői graftectomiákat. Eredmények: A vizsgált időszakban 480 veseátültetés történt. Közülük 55 betegnél (11%) történt graftectomia. A gyakoribb indikációk a következők voltak: krónikus allograft-nephropathia (47%), artériás keringési zavar (13%), ureterszövődmények (9%). A grafteltávolítás 22 betegnél (40%) akut, 33-nál (60%) tervezett volt. A graftectomiák 24%-a a transzplantáció után 30 napon belüli, 76%-a késői volt. Korai graftectomiát túlnyomórészt artériás keringészavar (31%), a későiek többségét (62%) krónikus allograft-nephropathia miatt végezték. Következtetések: A vizsgált időszakban a graftectomiák leggyakoribb oka krónikus allograft-nephropathia volt. Az esetek döntő többségében elektív műtét történt. A szakirodalomban közöltekhez hasonlóan a szerzők a korai és késői graftectomiák jellemzőit eltérőnek találták. Orv. Hetil., 2016, 157(24), 964–970

The sorption dynamics of C 3 hydrocarbons over carbon nanotubes

Carbon nanotubes obtained by the catalytic vapor deposition (CVD) method were purified by various procedures to obtain samples in pure and well-defined forms. The frequency response (FR) technique was employed to determine the sorption dynamics of C3-hydrocarbons in these samples. Two parallel sorption processes were found, characterized by different sorption capacities and time constants and were assigned to sorption on the convex and concave surfaces of the carbon tubes, respectively. Over a carbon nanotube sample at low coverage the mass transport is little influenced by the different chemical nature of the various C3 hydrocarbons. However the dynamic sorption properties of carbon nanotube preparations were shown to be strongly affected by the absence or presence of surface functional groups on the outer and inner surfaces of the tube walls. Different rate-determining mechanisms were observed for the samples functionalized to different extents

Selective production of imines and benzimidazoles by cooperative bismuth(III)/transition metal ion catalysis

Cooperative Bi(III)/Co(II) and Bi(III)/Mn(II) heterogeneous catalysts have been developed enabling efficient oxidative annulations for preparing both cross-coupled imines and benzimidazoles under ambient conditions in an atom-economic and time-efficient manner, involving ambient air as oxidant and without the need of any other additives. This is the first synergistic Lewis acid/transition metal catalyzed annulation which is potentiated by the interfaces between the building blocks of the catalysts. To achieve our goals, a useful fabrication process has been developed to heterogenize the transition metal ions via strong interactions on well-known Sillèn-type bismuth subcarbonate (bismutite). Their reusability, activity and selectivity as well as water-tolerance have made them potential competitors to effective heterogeneous/homogeneous catalysts reported previously

Selective production of imines and benzimidazoles by cooperative bismuth(III)/transition metal ion catalysis

Cooperative Bi(III)/Co(II) and Bi(III)/Mn(II) heterogeneous catalysts have been developed enabling efficient oxidative annulations for preparing both cross-coupled imines and benzimidazoles under ambient conditions in an atom-economic and time-efficient manner, involving ambient air as oxidant and without the need of any other additives. This is the first synergistic Lewis acid/transition metal catalyzed annulation which is potentiated by the interfaces between the building blocks of the catalysts. To achieve our goals, a useful fabrication process has been developed to heterogenize the transition metal ions via strong interactions on well-known Sillèn-type bismuth subcarbonate (bismutite). Their reusability, activity and selectivity as well as water-tolerance have made them potential competitors to effective heterogeneous/homogeneous catalysts reported previously

Effects of 6-epi-ophiobolin A on mechanical and physiological parameters of cardiomyocytes and on the reorganization and amounts of their kv4.x ion channels

Ophiobolins are important members of the family of phytotoxic metabolites, and they possess antitumor, antibacterial, antifungal activities. At the same time, the knowledge on the effect of ophiobolins on ion channels is very limited. The voltage-dependent transient outward currents (I to) are determined by kv4.2 and kv4.3 ion channels. Increasing evidence points to a role of HMGB1 and synapse-associated protein 97 (Sap97) as underlying factors related to inflammation. The Sap97 associates with kv4.x type channels in the complex and modulating their kinetic properties. Our hypothesis was that Sap97 mainly localizes in the intercalated discs of the cardiac muscle, therefore the altered expression of ion channels is presumably involved in the inhibition of normal mechanical parameters and physiological function of transient outward current (I to). Our approach was to use purified 6-epi-ophiobolin A as effective molecular tools in the investigation of ion channels on cardiomyocytes. In this work, we have investigated the mechanical factors by atomic force microscope (AFM) technique and the surface expression of kv4 ion channels on the cardiomyocytes using confocal microscopy after immunofluorescence labeling. AFM study revealed that the elasticity of the cell surface, the Young’s modulus had been moderately changed, as well as the cell volume and the heights of the cells in the presence of low concentration of 6-epi-ophiobolin A. After this treatment the Sap97 binding to kv4.3 or kv4.2 channels and distribution of their complexes are also changed in the membrane accompanied by altered physiological behavior of cardiomyocytes as compared to control. A growing number of researches using these new reductionist models of inflammation on cardiomyocytes, demonstrate a role of Sap97 in specific ion channel stability important for cardiac functions. These results suggest that Sap97 deactivation or reduction can lead (directly or indirectly) to changes in the functional cell surface expression of kv4.x channels with mechanical parameters, with biophysical and biochemical properties of cardiac I to current