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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova, Tatiana G., Prudnikova, Svetlana V., Kiselev, Evgeniy G., Nemtsev I. V., Vasiliev A. D., Kuzmin, Andrey P., Shishatskaya, Ekaterina I.
Заглавие : Bacterial cellulose (BC) and BC composites: Production and properties
Коллективы : Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0006]
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 2. - Ст.192. - ISSN 2079-4991(eISSN), DOI 10.3390/nano12020192
Примечания : Cited References: 113. - This research was financially supported by the State Assignment of the Ministry of Science and Higher Education of the Russian Federation No. FSRZ-2020-0006
Предметные рубрики: SILVER NANOPARTICLES
GLUCONACETOBACTER-HANSENII
MICROBIAL CELLULOSE
Аннотация: The synthesis of bacterial cellulose (BC) by Komagataeibacter xylinus strain B-12068 was investigated on various C-substrates, under submerged conditions with stirring and in static surface cultures. We implemented the synthesis of BC on glycerol, glucose, beet molasses, sprat oil, and a mixture of glucose with sunflower oil. The most productive process was obtained during the production of inoculum in submerged culture and subsequent growth of large BC films (up to 0.2 m2 and more) in a static surface culture. The highest productivity of the BC synthesis process was obtained with the growth of bacteria on molasses and glycerol, 1.20 and 1.45 g/L per day, respectively. We obtained BC composites with silver nanoparticles (BC/AgNPs) and antibacterial drugs (chlorhexidine, baneocin, cefotaxime, and doripenem), and investigated the structure, physicochemical, and mechanical properties of composites. The disc-diffusion method showed pronounced antibacterial activity of BC composites against E. coli ATCC 25922 and S. aureus ATCC 25923.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Afonnikova S. D., Bauman, Yury I., Stoyanovskii, Vladimir O., Volochaev M. N., Mishakov, Ilya V., Vedyagin, Aleksey A.
Заглавие : Effect of Cu on performance of self-dispersing Ni-catalyst in production of carbon nanofibers from ethylene
Колич.характеристики :17 с
Место публикации : C – J. Carbon Res. - 2023. - Vol. 9, Is. 3: Advanced Carbon Nanomaterials and Hybrids. - Ст.77. - ISSN 23115629 (eISSN), DOI 10.3390/c9030077
Примечания : Cited References: 72. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental order for Boreskov Institute of Catalysis (project AAAA-A21-121011390054-1). The physicochemical characterization of samples was supported by the Russian Science Foundation (project No. 22-13-00406, https://rscf.ru/en/project/22-13-00406/BIC SB RAS (accessed on 30 March 2023))Analysis of the physicochemical properties of the samples was performed using the equipment of the ‘National Center for Catalyst Research’ (Novosibirsk, BIC SB RAS) and Krasnoyarsk regional Center of the Collective Use (KSS SB RAS). The authors are grateful to A.N. Serkova for the performed SEM studies, B.A. Kolesov for the Raman spectra data, to A.B. Ayupov for analyzing samples by low-temperature adsorption/desorption of nitrogen, to Y.V. Shubin for the XRD analysis and to E.I. Belyaeva for the particle distribution analysis
Аннотация: The development of effective catalysts for the pyrolysis of light hydrocarbons with the production of carbon nanomaterials represents a relevant direction. In the present work, the influence of copper addition on performance of a self-dispersed Ni-catalyst and structural features of the obtained carbon nanofibers (CNFs) was studied. The precursors of Ni and Ni-Cu catalysts were prepared by activation of metal powders in a planetary mill. During contact with the C2H4/H2 reaction mixture, a rapid disintegration of the catalysts with the formation of active particles catalyzing the growth of CNFs has occurred. The kinetics of CNF accumulation during ethylene decomposition on Ni- and Ni-Cu catalysts was studied. The effect of temperature on catalytic performance was explored and it was shown that introduction of copper promotes 1.5–2-fold increase in CNFs yield in the range of 525–600 °C; the maximum CNFs yield (100 g/gcat and above, for 30-min reaction) is reached on Ni-Cu-catalyst at 575–600 °C. A comparative analysis of the morphology and structure of CNF was carried out using electron microscopy methods. The growth mechanism of carbon filaments in the shape of “railway crossties” on large nickel crystals (d 250 nm) was proposed. It was found that the addition of copper leads to a decrease in the bulk density of the carbon product from 40–60 to 25–30 g/L (at T = 550–600 °C). According to the low-temperature nitrogen adsorption data, specific surface area (SSA) of CNF samples (at T ˂ 600 °C) lies in the range of 110–140 m2/g, regardless of the catalyst composition; at T = 600 °C the introduction of copper contributed to an increase in the specific surface of CNF by 100 m2/g.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hsu, Hua-Shu, Chang Y.-Y., Chin Y.-Y., Lin H.-J., Chen C.-T., Sun S.-J., Zharkov S. M., Lin C.-R., Ovchinnikov S. G.
Заглавие : Exchange bias in graphitic C/Co composites
Место публикации : Carbon: Elsevier, 2017. - Vol. 114. - P.642-648. - ISSN 00086223 (ISSN), DOI 10.1016/j.carbon.2016.12.060
Примечания : Cited References: 54. - The authors would like to thank the Ministry of Science and Technology of the Republic of China, Taiwan, for financially supporting this research under Contract No. MOST 104-2112-M-153 -002 -MY3 (Hua-Shu Hsu), MOST 103-2112-M-213-004-MY3 (Hong-Ji Lin), and MOST 104-2112-M-390-001 (Shih-Jye Sun). We are thankful also to the President of Russia Program of support the leading scientific schools, grant NSh-7559,2016.2 (SGO).
Ключевые слова (''Своб.индексиров.''): carbides--carbon--dichroism--high resolution transmission electron microscopy--magnetoelectronics--transmission electron microscopy--x ray absorption--electronics production--exchange bias effects--experimental evidence--magnetic interactions--potential materials--spintronics application--theoretical modeling--x-ray magnetic circular dichroism--magnetic materials
Аннотация: The exchange bias (EB) effect, which is the shift of the hysteresis loop of a ferromagnet in direct contact with an antiferromagnet, is highly advantageous for the development of spintronics applications. Carbon (C) has been considered as a potential material in next generation electronics production as well as spintronics devices beyond silicon. Here we show experimental evidence for an EB in C/Co composites. The significant EB needs thermal annealing to occur. X-ray absorption spectra and transmission electron microscopy data of these samples reveal that Co carbides in as grown samples decompose and form graphitic C/Co interfaces after annealing. Using x-ray magnetic circular dichroism we have detected the C spins that are responsible for the EB. These results inspire a theoretical model to investigate the magnetic interactions in graphitic C/Co interfaces and interpret the observed results. © 2016 Elsevier Ltd
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T. G., Shishatskaya E. I., Zhila N. O., Киселев, Евгений Геннадьевич, Mironov P. V., Vasil'ev A. D., Peterson I. V., Sinskey A. J.
Заглавие : Fundamental basis of production and application of biodegradable polyhydroxyalkanoates
Место публикации : J. Sib. Fed. Univ. Biol. - 2012. - Vol. 5, Is. 3. - P.280-299; Журн. СФУ. Сер. "биология"
Ключевые слова (''Своб.индексиров.''): biopolymers--polyhydroxyalkanoates--substrates--synthesis--properties--processing--biomedical applications--биополимеры--полигидроксиалканоаты--субстраты--синтез--свойства--обработка--медико-биологическое применение
Аннотация: Microbial polyhydroxyalkanoates (PHAs) have long been studied due to their potential for replacement of petroleum-based plastic. The study addresses the effect of different conditions of carbon nutrition on synthesis of polyhydroxyalkanoates by the bacterium Ralstonia eutropha. First and foremost, PHAs are carbon storage compounds for many organisms. There are still many aspects of the physiology of PHA accumulation and degradation that are still not understood. Measurements of key P3HBrelated enzyme activities throughout cell growth reveal correlations of acetoacetyl-CoA reductase and synthase enzyme activity maxima with P3HB biosynthesis. The investigation addressed kinetic parameters of growth and accumulation of polyhydroxyalkanoates and gas exchange parameters of the culture of the CO-resistant strain of the hydrogen bacteria Ralstonia eutropha B 5786 cultivated on synthesis gas - a product of gasification of brown coals. The results were compared with those obtained by growing the bacteria on electrolytic hydrogen and it was concluded that synthesis gas can be successfully used to produce PHAs. In experiments with wild-type strain it has been first found that under mixotrophic growth conditions - CO2 + co-substrate (alcanoic acids) - bacteria can synthesize multi-component PHAs, consisting of short- and medium-chain-length monomers with carbon chains containing 4 to 8 atoms. It has been shown that PHA composition is determined by the type of the co-substrate. Fatty acids with odd number of carbons induce bacteria to synthesize multi-component PHAs with 3-hydroxybutyrate, 3-hydroxyvalerate, and 3-hydroxyhexanoate as major monomers and 3-hydroxyheptanoate and 3-hydroxyoctanoate as minor, occasionally occurring, ones. Fatty acids with even number of carbons induce synthesis of not only their respective monomers (3-hydroxyhexanoate and 3-hydroxyoctanoate) but also 3-hydroxyvalerate, making possible synthesis of four-component PHAs, containing 3-hydroxybutyrate and 3-hydroxyhexanoate as major components. A family of short- and medium-chain-length four- and five-component PHAs has been synthesized and their physicochemical and biomedical-properties examined.Полигидроксиалканоаты (ПГА) - перспективные материалы, которые могут заменить пластмассы на углеводородной основе, и они исследуются уже в течение длительного времени. Данная работа рассматривает воздействие различных условий углеродного питания на синтез полигидроксиалканоатов бактериями Ralstonia eutropha. Прежде всего ПГА являются запасными веществами для многих организмов. Многие аспекты физиологии накопления и разрушения ПГА остаются пока не изученными. Измерение активности ключевых ферментов 3ПГБ на протяжении роста клетки показывает связь максимумов активности ацетоацетил-КоА редуктазы и синтазы с биосинтезом 3ПГБ. Были исследованы кинетические параметры роста и накопления полигидроксиалканоатов и параметры газообмена культуры штамма водородных бактерий Ralstonia eutropha B 5786, устойчивого к СО, при культивировании на синтез-газе - продукте газификации бурых углей. Проведено сравнение полученных результатов с данными, полученными при выращивании бактерий на электролитическом водороде, и показано, что синтез-газ может успешно применяться для получения ПГА. В экспериментах с природным штаммом бактерий впервые было показано, что при миксотрофных условиях роста - CO2 + дополнительный субстрат (алкановые кислоты) - бактерии способны синтезировать многокомпонентные ПГА, состоящие из коротко- и среднецепочечных мономеров с длиной цепи от 4 до 8 атомов углерода. Показано, что состав ПГА зависит от типа дополнительного субстрата. Жирные кислоты с нечётным количеством атомов углерода стимулируют бактерии синтезировать многокомпонентные ПГА, состоящие из таких основных компонентов, как 3-гидроксибутират, 3-гидроксивалерат и 3-гидроксигексаноат, и второстепенных, эпизодических компонентов: 3-гидроксигептаноата и 3-гидроксиоктаноата. Жирные кислоты с чётным количеством атомов углерода стимулируют синтез как соответствующих им мономеров (3-гидроксигексаноата и 3-гидроксиоктаноата), так и 3-гидроксивалерата, что позволяет получать четырёхкомпонентные ПГА, содержащие 3-гидроксибутират и 3-гидроксигексаноат в качестве основных компонентов. Было синтезировано семейство коротко- и среднецепочечных четырёх- и пятикомпонентных ПГА и проведено исследование их физико-химических и медико-биологических свойств.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Markovskaya, Dina, V, Zhurenok, Angelina, V, Kurenkova, Anna Yu, Kremneva, Anna M., Saraev, Andrey A., Zharkov S. M., Kozlova, Ekaterina A., Kaichev, Vasily V.
Заглавие : New titania-based photocatalysts for hydrogen production from aqueous-alcoholic solutions of methylene blue
Место публикации : RSC Adv. - 2020. - Vol. 10, Is. 56. - P.34137-34148. - ISSN 2046-2069(eISSN), DOI 10.1039/d0ra07630a
Примечания : Cited References: 57. - The XPS and XRD experiments were performed using facilities of the shared research center "National center for investigation of catalysts" at Boreskov Institute of Catalysis. The authors are grateful to Dr S. Cherepanova for the XRD study and Dr T. Larina and Dr D. Selishchev for the UV-vis measurements. The TEM investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation
Предметные рубрики: Ray absorption-edge
In-situ
Ag nanoparticles
Chemical-states
XPS analysis
Аннотация: A series of CuOx–TiO2 photocatalysts were prepared using fresh and thermally activated Evonik Aeroxide P25 titanium dioxide. The photocatalysts were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, XANES, diffuse reflectance spectroscopy, and N2 adsorption technique. Photocatalytic activity of the samples was tested in hydrogen production from aqueous-alcoholic solutions of methylene blue under UV radiation (λ = 386 nm). It was found for the first time the synergistic effect of hydrogen production from two substrates—dye and ethanol. The maximum hydrogen production rate in the system water–ethanol–methylene blue was 1 μmol min−1, which is 25 times higher than a value measured in a 10% solution of ethanol in water. The thermal activation of titania also leads to a change in the rate of hydrogen production. The highest catalytic activity was observed for a CuOx–TiO2 photocatalyst based on titania thermally-activated at 600 °C in air. A mechanism of the photocatalytic reaction is discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhanova E.V., Sagatov N., Oreshonkov A. S., Gavryushkin P.N., Popov Z.I.
Заглавие : Novel Janus 2D structures of XMoY (X, Y = O, S, Se, Te) composition for solar hydrogen production
Место публикации : Int. J. Hydrog. Energy. - 2023. - Vol. 48, Is. 38. - P.14226-14237. - ISSN 03603199 (ISSN), DOI 10.1016/j.ijhydene.2022.12.286. - ISSN 18793487 (eISSN)
Примечания : Cited References: 97. - The authors acknowledge financial support from Russian Science Foundation (№ 21-73-20183). The authors are grateful to the Joint Supercomputer Center of the Russian Academy of Sciences and to the Information Technology Centre of Novosibirsk State University for providing access to the cluster computational resources
Аннотация: The successful fabrication of H-phase Janus transition metal dichalcogenides (TMDs) has received considerable interest due to its great potential in photocatalytic applications. Here, new A′-XMoY (X/Y = O, S, Se, Te) Janus-type structures belonging to the family of TMDs were theoretically investigated for the first time in terms of photocatalytic water splitting via DFT calculations. For all compounds, the Raman spectra were calculated. The SMoO, SeMoO, SMoSe, SMoTe and SeMoTe compounds are dynamically stable and are semiconductors. Among all considered structures SMoTe is the most promising candidate for solar hydrogen production because valence and conduction bands perfectly engulf the redox potentials of water at both neutral and acidic media, opposite to SMoSe, SMoO, SeMoO suitable only in the acidic media, and SeMoTe – in the neutral media. Moreover, A′-SMoTe demonstrates the outstanding values of the solar-to-hydrogen (STH) conversion efficiencies of 54.0 and 67.1 for neutral and acidic media.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Bayukov O. A., Balaev D. A., Iskhakov R. S., Ishchenko L. A., Ladygina V. P., Yaroslavtsev R. N.
Заглавие : Production and magnetic properties of biogenic ferrihydrite nanoparticles
Коллективы : Ministry of Education and Science of Russian Federation [3072]
Место публикации : J. Optoelectron. Adv. Mater. - 2015. - Vol. 17, Is. 7-8. - P.968-972. - ISSN 1454. - ISSN 18417132(eISSN)
Примечания : Cited References:14. - Support by project No3072 of the basic part of the state task of Ministry of Education and Science of Russian Federation is acknowledged.
Предметные рубрики: FERRITIN
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--biosynthesis--ferrihydrite--superparamagnetics
Аннотация: In present work the magnetic properties of biomineral ferrihydrite nanoparticles (biomass), produced by Klebsiella oxytoca strain and the nanoparticles obtained by drying the sol (so!), made on the basis of biomineral ferrihydrite nanoparticles have been studied. Ferrihydrite nanoparticles are formed on the surface of the bacterial cell.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova, Tatiana G., Kiselev, Evgeniy G., Demidenko, Alexey V., Zhila, Natalia O., Nemtsev I. V., Lukyanenko A. V.
Заглавие : Production and properties of microbial polyhydroxyalkanoates synthesized from hydrolysates of Jerusalem artichoke tubers and vegetative biomass
Коллективы : Project "Agropreparations of the new generation: a strategy of construction and realization" [075-15-2021-626]; State Assignment of the Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0006]
Место публикации : Polymers. - 2022. - Vol. 14, Is. 1. - Ст.132. - ISSN 2073-4360(eISSN), DOI 10.3390/polym14010132
Примечания : Cited References: 93. - This study was financially supported by Project "Agropreparations of the new generation: a strategy of construction and realization" (Agreement No. 075-15-2021-626) in accordance with Resolution No. 220 of the Government of the Russian Federation of 9 April 2010, "On measures designed to attract leading scientists to the Russian institutions of higher learning" (polymer synthesis, properties), and by the State Assignment of the Ministry of Science and Higher Education of the Russian Federation No. FSRZ-2020-0006 (films production, surface properties)
Предметные рубрики: GLUCOSE-UTILIZING STRAIN
RALSTONIA-EUTROPHA
ASPERGILLUS-NIGER
ACID
Аннотация: One of the major challenges in PHA biotechnology is optimization of biotechnological processes of the entire synthesis, mainly by using new inexpensive carbon substrates. A promising substrate for PHA synthesis may be the sugars extracted from the Jerusalem artichoke. In the present study, hydrolysates of Jerusalem artichoke (JA) tubers and vegetative biomass were produced and used as carbon substrate for PHA synthesis. The hydrolysis procedure (the combination of aqueous extraction and acid hydrolysis, process temperature and duration) influenced the content of reducing substances (RS), monosaccharide contents, and the fructose/glucose ratio. All types of hydrolysates tested as substrates for cultivation of three strains—C. necator B-10646 and R. eutropha B 5786 and B 8562—were suitable for PHA synthesis, producing different biomass concentrations and polymer contents. The most productive process, conducted in 12-L fermenters, was achieved on hydrolysates of JA tubers (X = 66.9 g/L, 82% PHA) and vegetative biomass (55.1 g/L and 62% PHA) produced by aqueous extraction of sugars at 80 °C followed by acid hydrolysis at 60 °C, using the most productive strain, C. necator B-10646. The effects of JA hydrolysates on physicochemical properties of PHAs were studied for the first time. P(3HB) specimens synthesized from the JA hydrolysates, regardless of the source (tubers or vegetative biomass), hydrolysis conditions, and PHA producing strain employed, exhibited the 100–120 °C difference between the Tmelt and Tdegr, prevailing of the crystalline phase over the amorphous one (Cx between 69 and 75%), and variations in weight average molecular weight (409–480) kDa. Supplementation of the culture medium of C. necator B-10646 grown on JA hydrolysates with potassium valerate and ε-caprolactone resulted in the synthesis of P(3HB-co-3HV) and P(3HB-co-4HB) copolymers that had decreased degrees of crystallinity and molecular weights, which influenced the porosity and surface roughness of polymer films prepared from them. The study shows that JA hydrolysates used as carbon source enabled productive synthesis of PHAs, comparable to synthesis from pure sugars. The next step is to scale up PHA synthesis from JA hydrolysates and conduct the feasibility study. The present study contributes to the solution of the critical problem of PHA biotechnology—finding widely available and inexpensive substrates.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Martyanov O. N.
Заглавие : Reversibility of asphaltene aggregation as revealed by magnetic resonance imaging in situ
Место публикации : Energy Fuels: American Chemical Society, 2017. - Vol. 31, Is. 10. - P.10639-10647. - ISSN 08870624 (ISSN), DOI 10.1021/acs.energyfuels.7b01755
Примечания : Cited References: 56. - This research was performed on the equipment of Krasnoyarsk Regional Research Equipment Centre of Siberian Branch of Russian Academy of Sciences with the financial support of Russian Science Foundation (Project No. 15-19-00119).
Ключевые слова (''Своб.индексиров.''): aggregates--crude oil--flocculation--heavy oil production--magnetic resonance imaging--asphaltene aggregates--asphaltene aggregation--asphaltene precipitation--equilibrium compositions--flocculant concentrations--inhomogeneous distribution--mechanical stirring--multi-component systems--asphaltenes
Аннотация: Aggregation of asphaltenes followed by precipitation presents severe problems for existing technologies in the production, recovery, and processing of heavy oils. Better understanding of asphaltene behavior behind the processes of their precipitation and dissolution is vital to address this issue. While investigating the inhomogeneity of different oil systems, the reversibility of the asphaltene aggregation process initiated by flocculant in either asphaltene solution in toluene or crude heavy oil was revealed and investigated using magnetic resonance imaging methods. It was found that the inhomogeneous distribution of the flocculant initiates local spatial-selective asphaltene aggregation registered in a thin layer around the flocculant/oil sample interface. The local excess of flocculant concentration over the threshold of asphaltene precipitation onset is a driving force of this process. As the flocculant diffuses into the volume of the sample, a decrease of the asphaltene flocculated area is observed until it disappears when the equilibrium composition throughout the whole volume of the system is achieved. Depending on the overall flocculant concentration, the asphaltene aggregation may not be reversible and could be followed by subsequent precipitation of the asphaltene aggregates. The similarity of the phenomena observed for the model asphaltene solutions and crude heavy oil samples was established. Partial mechanical stirring of the multicomponent system comprising flocculant and oil or asphaltene solution does not prevent the formation of the local zones with increased concentration of asphaltene aggregates; those sizes evolve depending on the flocculant concentration. The results obtained in this work are consistent with the generally accepted concept of asphaltene precipitation reversibility depending on the system composition and are compatible with the observations obtained by other methods. The approach presented can provide deeper insight into the asphaltene precipitation reversibility issue and can facilitate the understanding of asphaltene behavior in heavy oils.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kichanov S., Pantelica A., Pantelica D., Stolyar S. V., Iskhakov R. S., Aranghel D., Ionescu P., Vladoiu R., Balasoiu M.
Заглавие : Structural and compositional specifications on biogenic ferrihydrite nanoparticles production by Klebsiella oxytoca
Коллективы : Joint Institute for Nuclear Research Project [04-4-1121-2015/2017]; RO-JINR Projects [95/15.02.2016, 96/15.02.2016, 77, 82]; Krasnoyarsk region [17-43-240527]; Special Program for Siberian Federal University of the Ministry of Education and Science of the Russian Federation; RFBR
Место публикации : Rom. Rep. Phys. - 2018. - Vol. 70, Is. 4. - Ст.511. - ISSN 1221-1451. - ISSN 1841-8759(eISSN)
Примечания : Cited References: 17. - This work was supported by the Joint Institute for Nuclear Research Project No. 04-4-1121-2015/2017, and RO-JINR Projects Nos. 95/15.02.2016 and 96/15.02.2016, items 77, 82 and was funded by RFBR and Krasnoyarsk region according to the research project No 17-43-240527. Support by the Special Program for Siberian Federal University of the Ministry of Education and Science of the Russian Federation is acknowledged.
Предметные рубрики: MAGNETIC-PROPERTIES
Ключевые слова (''Своб.индексиров.''): biogenic ferrihydrite--nanoparticles structure--synchrotron radiation--powder diffraction--pixe--pige--rbs
Аннотация: Investigations of biogenic ferrihydrite nanoparticles produced by bacteria Klebsiella oxytoca by applying methods of synchrotron radiation powder diffraction, particle-induced X-ray emission (PIXE), proton induced gamma-emission (PIGE) and proton Rutherford backscattering (RBS) are reported and discussed.
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