Research objective is to study antibacterial action of nanoparticles of iron and copper on polyantibiotically resistant clinical Staphylococcus aureus strains. Materials and methods include antibacterial action of nanoparticles of copper and iron on 10 Staphylococcus au¬reus strains, isolated from patients with purulent complications stayed in the in-patient department of traumatology and orthopedics. Solutions of powders of iron and copper have been prepared directly before the experiment in concentra¬tion from 0,001 to 1 mg/ml. it has been revealed that the influence of nanoparticles on growth of clinical strains and the intensity of antibacterial effect depends on the form of nanoparticles, their concentration and action time. concentration of 0,1 mg/ml and 1 mg/ ml of iron nanoparticles has provoked the decrease in quantity of microbe cells from 3 to 34 % (p <0,01). in smaller concentrations the reliable antibacterial effect has not been observed. Antibacterial activity of copper nanoparticles has been expressed in a wide range of concentrations from 0,001 mg/ml to 1 mg/ml, even during short-term action (30 minutes) it has provoked reduction of quantity of the microbe cells grown on the firm nutrient medium, 97-100 % in comparison with the control (p <0,001). in conclusion it is to point out that copper nanoparticles have more expressed inhibitory effect on growth of clini¬cal strains of golden staphylococcus than iron nanoparticle suspension. inhibition degree depends on superdispersed powder dosage and incubation period
I.V. Babushkina, V.B. Borodulin, G.V. Korshunov, D.M. Puchinjan Comparative study of antibacterial action of iron and copper nanoparticles on clinical Staphylococcus aureus strains // Saratov Journal of Medical Scientific Research, Vol. 6, Issue 1, 2010, pp. 11-14

http://scipeople.ru/publication/69766/; Ostroumov S. A., Kolesov G. M. The aquatic macrophyte Ceratophyllum demersum immobilizes Au nanoparticles after their addition to water. - Doklady Biological Sciences, 2010, Vol. 431, pp. 124–127. http://scipeople.com/publication/69766/ [© Pleiades Publishing, Ltd., ISSN 0012-4966]. Original Russian Text © S.A. Ostroumov, G.M. Kolesov, 2010, published in Doklady Akademii Nauk, 2010, Vol. 431, No. 4, pp. 566–569. Bibliogr. 15 refs. Presented by Academician M.A. Fedonkin July 31, 2009. DOI: 10.1134/S0012496610020158. This is the first time it was shown that the nanoparticles of gold (Au) in substantial amount bind to the living biomass of the aquatic macrophyte, Ceratophyllum demersum. The concentrations of Au were measured in the samples of the phytomass of the macrophyte using neutron activation analysis (NAA). As a result of the binding and/or immobilization of the nanoparticles, the amount of Au in the samples of the phytomass increased manifold above the background level of gold in the plant tissues. The increase was by two orders of magnitude. The new data added some new information to the modern vision of the multifunctional role of the biota in the migration of elements in aquatic ecosystems. Also, the result added new information to the studies of interactions of Au with organisms that may contribute to new biotechnologies. Key words: phytomass, biomass, aquatic macrophytes, plants, phytotechnologies, vegetation, biogenic migration of elements, aquatic microcosms, accumulation, nanoparticles, self-purification, neutron activation analysis, NAA, microcosms, gold, Au, immobilization, binding, Ceratophyllum demersum ISSN 0012-4966, Doklady Biological Sciences, 2010, Vol. 431, pp. 124–127. © Pleiades Publishing, Ltd., 2010. Original Russian Text © S.A. Ostroumov, G.M. Kolesov, 2010, published in Doklady Akademii Nauk, 2010, Vol. 431, No. 4, pp. 566–569. The Aquatic Macrophyte Ceratophyllum demersum Immobilizes Au Nanoparticles after Their Addition to Water S. A. Ostroumov (a) and G. M. Kolesov (b) Presented by Academician M.A. Fedonkin. DOI: 10.1134/S0012496610020158 a Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, 119991 Russia b Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul.Kosygina 19, Moscow, 119991 Russia Study of biogenic migration of elements is an important line of biosphere research [1–8]. Biogenic migration of elements in aquatic ecosystems, both freshwater and saltwater, is important for water self- purification and quality formation [9–11]. Data on element accumulation and binding by aquatic organisms, including macrophytes, are important for analyzing the organisms’ important role in biogenic migration of elements in aquatic ecosystems. The concentrations of some elements were determined earlier in different biogenic samples, including hydrobionts and biogenic detrital substances [9, 10]. However, these data were based on a limited set of organisms and elements. There are no published data on either gold (Au) content in Ceratophyllum demersum L. or interaction between Au nanoparticles and aquatic macrophytes. The goal of this work was to study the immobilization of Au nanoparticles added to the water medium of microcosms in the presence of macrophyte hydrobionts C. demersum L.
Doklady Biological Sciences, 2010, Vol. 431, pp. 124–127. [© Pleiades Publishing, Ltd., ISSN 0012-4966].

Multilayer structures based on matrices of CdSe and CdSe/ZnS nanoparticles in polyimide (PI) and poly[2-methoxy- 5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) were prepared and investigated. A comparison of photoluminescence of the various matrices excited by visible and ultraviolet laser radiation was carried out. The main contribution to the photoluminescence was made by the organic semiconductors. Quantum yield of the luminescence of CdSe nanoparticles embedded in organic semiconductor matrix was found to be lower then that of the individual CdSe nanoparticles dispersed onto a glass substrate. This difference was shown to be a result of charge transfer from the nanoparticles to organic molecules. The nanoparticles were responsible for photovoltage in thin layers of the PI/nanoparticles composites. Processing of a surface of electrodes and organic semiconductors by oxygen plasma increased the photovoltaic efficiency.

Solid thin films of CdSe and CdSe/ZnS nanoparticles on different templates have been investigated under influence of power visible laser radiation. Composite structures including organic semiconductors and CdSe and CdSe/ZnS nanoparticles films have been fabricated. Luminescent and electron properties of the structures have been investigated. Luminescence quantum yield of these nanocomposite structures is shown to exceed that of the films of organic dyes by two orders of magnitude for CdSe nanoparticles with ZnS shell. As for quantum dots without the shell their luminescence quantum yield appears to fall drastically in the films and even in the matrices of organic semiconductors compared to the solution. The presence of CdSe films in multi-layer structures of polyimides leads to abrupt increase in their conductivity by several orders of magnitude. The prospects of development of photovoltaic elements and light-emitting devices including the films with high concentration of CdSe and CdSe/ZnS quantum dots are discussed.

The films with low and high concentrations of CdSe/ZnS nanoparticles have been investigated under action of visible and ultra-violet laser radiation in a wide range of power densities and temperatures. Strong shifts of absorption and luminescence spectra without increase in their width have been observed at the transition from the solution to the films of quantum dots. A complex investigation of anti-stokes luminescence of nanoparticles films has shown its thermal mechanism. Luminescence spectra of the films of quantum dots under action of ultra-violet laser radiation allow monitoring the presence of surface-active TOP and TOPO molecules in the films of quantum dots. The absence of surface-active molecules in the films with high concentration of CdSe/ZnS nanoparticles is shown. The modes of the action of power laser radiation on the films of quantum dots have been investigated. The possibility of controlling the thickness of the films by laser ablation has been shown.

Optical properties of the films with high concentration of semiconductor core-shell CdSe/ZnS nanocrystals under action of visible laser radiation in a wide range of power densities have been investigated. It's shown that in the films with ultimate concentration ofthe nanocrystals a quantum-size effect is observed. High concentration of the nanocrystals in the films and the presence of dipoles caused by nanoparticles asymmetry lead to strong shift of quantum-size peaks in absorption and luminescence spectra compared to the solution and the films with low concentration of the nanoparticles. The altitude of the shift depends on the thickness of the films and varies from 35 nm to 50 nm. The luminescence spectra of the films don't change until the power density of exciting laser radiation exceeds 1x106 W/cm2. The regimes of laser action on the films of the nanoparticles with power densities beyond the threshold of films destruction (from 5x10^6 W/cm^2 to 1x10^9 W/cm^2) have been investigated.

CdSe/ZnS quantum dots in solution ad in condensed phase have been investigated by methods of laser induced luminescence. Anti-stokes photoluminescence (APL) of CdSe/ZnS nanoparticles in the solutions and in the films has been studied under action of laser radiation of various wavelengths. The dependencies of APL of CdSe/ZnS nanoparticles ensembles on exciting radiation intensity, temperature and quantum dots concentration have been studied. It is shown that the mechanism of APL formation in CdSe/ZnS nanoparticles is thermal.

The paper reports comparative studies on synthesized aluminium nitride nanotubes, nanoparticles and commercially available micron-sized AlN powder using different spectroscopic techniques: cathodoluminescence measurements (CL), X-ray absorption near edge spectroscopy (XANES) and Fourier-transform infrared spectroscopy (FTIR). Crucial distinctions in CL spectra are observed for nano- and microsized aluminium nitride powders; systematic shift of the IR absorption maximum has been detected for nanostructured aluminium nitride as compared to commercial samples. Through XANES experiments on Al K-edge structural differences between nano- and bulk AlN are revealed, intensity of features in absorption spectra has been found to be a function of wurtzite and zincblend phases amount in nanostructured samples.
Radiation Measurements, 2007, vol.42, pp. 708-711.