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91.
92.
Magdalena Kdzierska Piotr Potemski Anna Drabczyk Sonia Kudacik-Kramarczyk Magdalena Gb Beata Grabowska Dariusz Mierzwiski Boena Tyliszczak 《Molecules (Basel, Switzerland)》2021,26(6)
Many investigations are currently being performed to develop the effective synthesis methodology of magnetic nanoparticles with appropriately functionalized surfaces. Here, the novelty of the presented work involves the preparation of nano-sized PEGylated Fe3O4@Ag particles, i.e., the main purpose was the synthesis of magnetic nanoparticles with a functionalized surface. Firstly, Fe3O4 particles were prepared via the Massart process. Next, Ag+ reduction was conducted in the presence of Fe3O4 particles to form a nanosilver coating. The reaction was performed with arabic gum as a stabilizing agent. Sound energy-using sonication was applied to disintegrate the particles’ agglomerates. Next, the PEGylation process aimed at the formation of a coating on the particles’ surface using PEG (poly(ethylene glycol)) has been performed. It was proved that the arabic gum limited the agglomeration of nanoparticles, which was probably caused by the steric effect caused by the branched compounds from the stabilizer that adsorbed on the surface of nanoparticles. This effect was also enhanced by the electrostatic repulsions. The process of sonication caused the disintegration of aggregates. Formation of iron (II, III) oxide with a cubic structure was proved by diffraction peaks. Formation of a nanosilver coating on the Fe3O4 nanoparticles was confirmed by diffraction peaks with 2θ values 38.15° and 44.35°. PEG coating on the particles’ surface was proven via FT-IR (Fourier Transform Infrared Spectroscopy) analysis. Obtained PEG–nanosilver-coated Fe3O4 nanoparticles may find applications as carriers for targeted drug delivery using an external magnetic field. 相似文献
93.
J. W. Mietelski P. Szwako E. Tomankiewicz P. Gaca S. Maek J. Barszcz S. Grabowska 《Journal of Radioanalytical and Nuclear Chemistry》2004,262(3):645-660
Results for 137Cs, 40K, 90Sr, 238,239+240Pu, 241Am and 243+244Cm measurements in plant, insects and forest litter samples collected at three sites in Poland are presented. New results are compared with some existing data for locations examined during previous studies. Insect samples were introduced now for the first time. Relatively high activities of 90Sr were noticed for spruce bark beetle (Ips typographus) and those for 137Cs, plutonium and 241Am for forest dung beetle (Anoplotrupes stercorosus). Faster than caused by physical decay decrease of radiocesium activity was noticed for the majority of plant and litter samples. The results for 239+240Pu for litter were similar to previous results, but the activities of 238Pu were smaller. The activity ratio between 241Am and 239+240Pu was found lower than expected for known proportions between global and Chernobyl fallout. Thus a kind of dynamic behavior of Pu and Am in the forest ecosystem is concluded. Transfer factors and aggregation coefficients were estimated and discussed for both plants and insects as well as between insects and the part of plants (or litter) they feed on. Many of them were never presented before.The authors are thankful to the Polish State Committee for Scientific Research for financial support of this investigation, Grant No. PG04 07520. 相似文献
94.
J. W. Mietelski L. Kitowski P. Gaca S. Grabowska E. Tomankiewicz P. Szwałko 《Journal of Radioanalytical and Nuclear Chemistry》2006,270(1):131-135
Summary The present study focused on analyzing samples of bones, livers and kidneys of European white-tailed eagles (Halia?tus albicilla) and lesser-spotted eagle (Aquila pomarina). Bone samples were collected for both species, from 7 and 2 individuals, respectively, whereas liver and kidney samples
for white-tailed eagle species only, 2 and 1 individuals, respectively. The samples were analyzed for the presence of gamma-emitters
and then for 90Sr, 238Pu, 239+240Pu and 241Am. The applied radiochemical method is presented. Activity concentration in ashen bones (600 °C) for 90Sr ranged from 4.6±1.2 to 31.0±2.5 Bq/kg, for 239+240Pu from <1.7 to 21±4 mBq/kg, for 238Pu from <2.7 to 6.5±1.3 mBq/kg and for 241Am from <1.2 to 6.5±4.4 mBq/kg. Relatively high 239+240Pu activity concentration of 78±9 mBq/kg (for fresh weight) was recorded in a single kidney sample. The liver samples showed
activities of magnitude at least one order lower. No clear correlations were found between the activities of different radionuclides. 相似文献
95.
The vapour phase alkylation of methoxyphenols with alcohols in the presence of an iron catalyst that contains Cr, Si and K
oxides was studied. The reactions were carried out in a continuous process at atmospheric pressure. It is possible to receive
ortho alkylated derivatives of 3- and 4-methoxyphenol with high yield and selectivity. 相似文献
96.
Grabowska Katarzyna Grabowski Janusz Ravanpak Zohreh 《Annals of Global Analysis and Geometry》2022,62(1):235-284
Annals of Global Analysis and Geometry - Motivated by properties of higher tangent lifts of geometric structures, we introduce concepts of weighted structures for various geometric objects on a... 相似文献
97.
Emilia Grodzka Joanna Grabowska Monika Wysocka-Żołopa Krzysztof Winkler 《Journal of Solid State Electrochemistry》2008,12(10):1267-1278
The electrochemically active polymers have been formed during electro-reduction carried out in solution containing fullerenes,
C60 or C70, and transition metal complexes of Pd(II), Pt(II), Rh(III), and Ir(I). In these films, fullerene moieties are covalently
bounded to transition metal atoms (Pd and Pt) or their complexes (Rh and Ir) to form a polymeric network. All films exhibit
electrochemical activity at negative potentials due to the fullerene cages reduction process. For all studied metal complexes,
yields of formation of films containing C70 are higher than yields of electrodeposition of their C60 analogs. C70
/M films also exhibit higher porosity in comparison to C60/M layers. The differences in film morphology and efficiency of polymer formation are responsible for differences in electrochemical
responses of these films in acetonitrile containing supporting electrolyte only. C70/M films shows more reversible voltammeric behavior in negative potential range. They also show higher potential range of electrochemical
stability. Processes of film formation and electrochemical properties of polymers depend on the transition metal ions or atoms
bonding fullerene cages into polymeric network. The highest efficiency of polymerization was observed for fullerene/Pd and
fullerene/Rh films. In the case of fullerene/Pd films, the charge transfer processes related to the fullerene moieties reduction
in negative potential range exhibit the best reversibility among all of the studied systems. Capacitance performances of C60/Pd and C70/Pd films deposited on the porous Au/quartz electrode were also compared. Capacitance properties of both films are significantly
affected by the conditions of electropolymerization. Only a fraction of the film having a direct contact with solution contributes
to pseudocapacitance. Capacitance properties of these films also depend on the size of cations of supporting electrolyte.
The C70/Pd film exhibits much better capacitance performance comparison to C60/Pd polymer. 相似文献
98.
Agata Jargiło Iwona Grabowska Hanna Radecka Magdalena Sulima Ilona Marszałek Aleksandra Wysłouch‐Cieszyńska Wim Dehaen Jerzy Radecki 《Electroanalysis》2013,25(5):1185-1193
The new system which consists of the thiol derivative of dipyrromethene–Cu(II) complex created on the surface of a gold electrode was applied for the first time for oriented immobilization of selected His‐tagged domains of a receptor for advanced glycation endproducts (RAGE). Cyclic voltammetry (CV), Osteryoung square‐wave voltammetry (OSWV), electrochemical impedance spectroscopy (EIS) and atomic force microscopy (AFM) were used for characterization of the redox active sensing layer. The biosensor proposed was applied for determination of Aβ16–23′ peptide. In its presence, a decrease of the maximum Cu(II) redox current was observed. These values correlated linearly with the Aβ16–23′ concentration in the range 0.001–1.000 µM. The presence of diluted human plasma has no influence on the sensor responses. 相似文献
99.
J. W. Mietelski P. Szwałko E. Tomankiewicz P. Gaca S. Małek J. Barszcz S. Grabowska 《Journal of Radioanalytical and Nuclear Chemistry》2005,262(3):645-660
Results for 137Cs, 40K, 90Sr, 238,239+240Pu, 241Am and 243+244Cm measurements in plant, insects and forest litter samples collected at three sites in Poland are presented. New results are compared with some existing data for locations examined during previous studies. Insect samples were introduced now for the first time. Relatively high activities of 90Sr were noticed for spruce bark beetle (Ips typographus) and those for 137Cs, plutonium and 241Am for forest dung beetle (Anoplotrupes stercorosus). Faster than caused by physical decay decrease of radiocesium activity was noticed for the majority of plant and litter samples. The results for 239+240Pu for litter were similar to previous results, but the activities of 238Pu were smaller. The activity ratio between 241Am and 239+240Pu was found lower than expected for known proportions between global and Chernobyl fallout. Thus a kind of dynamic behavior of Pu and Am in the forest ecosystem is concluded. Transfer factors and aggregation coefficients were estimated and discussed for both plants and insects as well as between insects and the part of plants (or litter) they feed on. Many of them were never presented before.The authors are thankful to the Polish State Committee for Scientific Research for financial support of this investigation, Grant No. PG04 07520. 相似文献
100.