Journal articles: 'Biogenic magnetic nanoparticles'

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Gorobets, S. V. "Biogenic magnetic nanoparticles in lung, heart and liver." Functional materials 24, no. 3 (September 29, 2017): 005–408. http://dx.doi.org/10.15407/fm24.03.405.

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Gorobets, O. Yu. "BIOMAGNETISM AND BIOGENIC MAGNETIC NANOPARTICLES." Visnik Nacional'noi' akademii' nauk Ukrai'ni, no. 07 (July 20, 2015): 53–64. http://dx.doi.org/10.15407/visn2015.07.053.

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Gerasimets, I., O. Petrenko, T. Savchenko, J. Kardanets, A. Grechanovsky, and N. Dudchenko. "Synthesis and properties of biogenic magnetite synthetic analogues." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 1 (64) (2014): 21–25. http://dx.doi.org/10.17721/1728-2713.64.04.21-25.

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This paper deals with different factors (ultrasonication, magnetic field) in determining the properties of synthesized magnetite nanoparticles. Development of technologies for creating synthetic analogues of magnetic minerals localized in human and other living organism tissues is of great importance in solving a wide range of mineralogical, medical-biological and material science problems. Magnetite is one of the physiological biominerals in living organisms, its formation being genetically determined. Magnetically ordered biogenic nanoparticles of iron oxides and hydroxides, which are biominerals, are known to realize a wide range of biological functions, including animals' orientation in space, and to play an important role in brain functioning. Migratory birds, bees, fish develop a sense of direction in space ("magnetic compass") due to the presence of magnetite, which is why this vital biomineral is of wide scientific interest. The paper describes the methods of magnetite nanoparticle synthesis using a magnetic field and ultrasound. Co-precipitation is described as one of the easiest chemical methods of synthesizing magnetic nanoparticles. Samples were synthesized by employing the method of coprecipitation of Fe3+ and Fe2+ salts in an alkaline medium involving ultrasound and magnetic fields. X-ray diffraction and magnetometry were used to study the samples. Special attention was given to the magnetic properties and determining the crystallite size of the produced mineral. The research results showed a correlation between the crystallite size and various synthesis conditions. With ultrasound applied, the size of the synthesized nanoparticles tends to be bigger as compared to that of the nanoparticles obtained without ultrasonication. It was determined that magnetization of samples increases with the increase in the size of nanoparticles. The research results are summarized in the tables and illustrations presented in the paper. The obtained data can be used for developing and improving the technologies for biogenic magnetite analogue synthesis. The paper could be of use to teachers, students, and researchers interested in biomineralogy and magnetic nanoparticle synthesis.

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Gorobets, S. V. "Potential producers of biogenic magnetic nanoparticles among disease-producing microorganisms of the brain." Functional materials 24, no. 3 (September 29, 2017): 005–404. http://dx.doi.org/10.15407/fm24.03.400.

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Gorobets, O. Yu. "Biomineralization and synthesis of biogenic magnetic nanoparticles and magnetosensitive inclusions in microorganisms and fungi." Functional materials 21, no. 4 (December 30, 2014): 427–36. http://dx.doi.org/10.15407/fm21.04.427.

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Wei, J. D., I. Knittel, C. Lang, D. Schüler, and U. Hartmann. "Magnetic properties of single biogenic magnetite nanoparticles." Journal of Nanoparticle Research 13, no. 8 (April 8, 2011): 3345–52. http://dx.doi.org/10.1007/s11051-011-0357-4.

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Byrne, J. M., V. S. Coker, S. Moise, P. L. Wincott, D. J. Vaughan, F. Tuna, E. Arenholz, et al. "Controlled cobalt doping in biogenic magnetite nanoparticles." Journal of The Royal Society Interface 10, no. 83 (June 6, 2013): 20130134. http://dx.doi.org/10.1098/rsif.2013.0134.

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Cobalt-doped magnetite (Co x Fe 3 − x O 4 ) nanoparticles have been produced through the microbial reduction of cobalt–iron oxyhydroxide by the bacterium Geobacter sulfurreducens . The materials produced, as measured by superconducting quantum interference device magnetometry, X-ray magnetic circular dichroism, Mössbauer spectroscopy, etc., show dramatic increases in coercivity with increasing cobalt content without a major decrease in overall saturation magnetization. Structural and magnetization analyses reveal a reduction in particle size to less than 4 nm at the highest Co content, combined with an increase in the effective anisotropy of the magnetic nanoparticles. The potential use of these biogenic nanoparticles in aqueous suspensions for magnetic hyperthermia applications is demonstrated. Further analysis of the distribution of cations within the ferrite spinel indicates that the cobalt is predominantly incorporated in octahedral coordination, achieved by the substitution of Fe 2+ site with Co 2+ , with up to 17 per cent Co substituted into tetrahedral sites.

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Gorobets, S. V., O. Medviediev, O. Yu Gorobets, and A. Ivanchenko. "Biogenic magnetic nanoparticles in human organs and tissues." Progress in Biophysics and Molecular Biology 135 (July 2018): 49–57. http://dx.doi.org/10.1016/j.pbiomolbio.2018.01.010.

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Mikeshyna, H. I., Y. A. Darmenko, O. Yu Gorobets, S. V. Gorobets, I. V. Sharay, and O. M. Lazarenko. "Influence of Biogenic Magnetic Nanoparticles on the Vesicular Transport." Acta Physica Polonica A 133, no. 3 (March 2018): 731–33. http://dx.doi.org/10.12693/aphyspola.133.731.

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Darmenko, Y. A., O. Yu Gorobets, S. V. Gorobets, I. V. Sharay, and O. M. Lazarenko. "Detection of Biogenic Magnetic Nanoparticles in Human Aortic Aneurysms." Acta Physica Polonica A 133, no. 3 (March 2018): 738–41. http://dx.doi.org/10.12693/aphyspola.133.738.

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Bettini, S., A. Santino, L. Valli, and G. Giancane. "A smart method for the fast and low-cost removal of biogenic amines from beverages by means of iron oxide nanoparticles." RSC Advances 5, no. 23 (2015): 18167–71. http://dx.doi.org/10.1039/c5ra01699a.

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Silica capped iron oxide nanoparticles are used to bind biogenic amines dissolved in a wine sample. The adduct formed by the capped paramagnetic nanoparticles and amines is separated by a weak magnetic field without affecting the wine taste.

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Venkateswarlu, Sada, Y. Subba Rao, T. Balaji, B. Prathima, and N. V. V. Jyothi. "Biogenic synthesis of Fe3O4 magnetic nanoparticles using plantain peel extract." Materials Letters 100 (June 2013): 241–44. http://dx.doi.org/10.1016/j.matlet.2013.03.018.

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Chutia, Rituparna, and Bolin Chetia. "Biogenic CuFe2O4 magnetic nanoparticles as a green, reusable and excellent nanocatalyst for acetylation reactions under solvent-free conditions." New Journal of Chemistry 42, no. 18 (2018): 15200–15206. http://dx.doi.org/10.1039/c8nj02685h.

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Venkateswarlu, Sada, and Minyoung Yoon. "Surfactant-free green synthesis of Fe3O4 nanoparticles capped with 3,4-dihydroxyphenethylcarbamodithioate: stable recyclable magnetic nanoparticles for the rapid and efficient removal of Hg(ii) ions from water." Dalton Transactions 44, no. 42 (2015): 18427–37. http://dx.doi.org/10.1039/c5dt03155a.

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A 3,4-dihydroxyphenethylcarbamodithioate capped biogenic Fe₃O₄ magnetic nanocomposite has been synthesized using a watermelon rind extract for the removal of Hg(ii) ions with a facile recyclability.

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Józefczak, Arkadiusz, Tomasz Hornowski, Anita Król, Matúš Molčan, Błażej Leszczyński, and Milan Timko. "The Effect of Sonication on Acoustic Properties of Biogenic Ferroparticle Suspension." Archives of Acoustics 41, no. 1 (March 1, 2016): 161–68. http://dx.doi.org/10.1515/aoa-2016-0016.

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Abstract Superparamagnetic iron oxide nanoparticles (SPION) synthesised chemically usually need the modification of the particle surface. Other natural sources of magnetic particles are various magnetotactic bacteria. Magnetosomes isolated from magnetotactic bacteria are organelles consisting of magnetite (Fe3O4) or greigite (Fe3S4) crystals enclosed by a biological membrane. Magnetotactic bacteria produce their magnetic particles in chains. The process of isolation of magnetosome chains from the body of bacteria consists of a series of cycles of centrifugation and magnetic decantation. Using a high-energy ultrasound it is possible to break the magnetosome chains into individual nanoparticles – magnetosomes. This study presents the effect of sonication of magnetosome suspension on their acoustic properties, that is speed and attenuation of the sound. Acoustic propagation parameters are measured using ultrasonic spectroscopy based on FFT spectral analysis of the received pulses. The speed and attenuation of ultrasonic waves in magnetosome suspensions are analysed as a function of frequency, temperature, magnetic field intensity, and the angle between the direction of the wave and the direction of the field.

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Gorobets, Svitlana, Oksana Gorobets, and Kateryna Butenko. "Potential Producers of Biogenic Magnetic Nanoparticles among Pathogenic and Opportunistic Microorganisms." Innovative Biosystems and Bioengineering 2, no. 1 (April 2, 2018): 33–41. http://dx.doi.org/10.20535/ibb.2018.2.1.127260.

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Nagai, Ryosuke, Masaru Kurahashi, Kengo Kishimoto, Tsuyoshi Koyanagi, Masakazu Iwasaka, and Hironori Asada. "Magnetic motion of biogenic guanine crystal plate combined with Fe2O3 nanoparticles." AIP Advances 10, no. 1 (January 1, 2020): 015032. http://dx.doi.org/10.1063/1.5130062.

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Medviediev, O., O. Yu Gorobets, S. V. Gorobets, and V. S. Yadrykhins’ky. "The prediction of biogenic magnetic nanoparticles biomineralization in human tissues and organs." Journal of Physics: Conference Series 903 (October 2017): 012002. http://dx.doi.org/10.1088/1742-6596/903/1/012002.

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Ohuchi, Shoji, and Dirk Schüler. "In Vivo Display of a Multisubunit Enzyme Complex on Biogenic Magnetic Nanoparticles." Applied and Environmental Microbiology 75, no. 24 (October 16, 2009): 7734–38. http://dx.doi.org/10.1128/aem.01640-09.

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ABSTRACT Magnetosomes are unique bacterial organelles comprising membrane-enveloped magnetic crystals produced by magnetotactic bacteria. Because of several desirable chemical and physical properties, magnetosomes would be ideal scaffolds on which to display highly complicated biological complexes artificially. As a model experiment for the functional expression of a multisubunit complex on magnetosomes, we examined the display of a chimeric bacterial RNase P enzyme composed of the protein subunit (C5) of Escherichia coli RNase P and the endogenous RNA subunit by expressing a translational fusion of C5 with MamC, a known magnetosome protein, in the magnetotactic bacterium Magnetospirillum gryphiswaldense. As intended, the purified C5 fusion magnetosomes, but not wild-type magnetosomes, showed apparent RNase P activity and the association of a typical bacterial RNase P RNA. Our results demonstrate for the first time that magnetosomes can be employed as scaffolds for the display of multisubunit complexes.

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Knyazev, Yu V., D. A. Balaev, S. V. Stolyar, O. A. Bayukov, R. N. Yaroslavtsev, V. P. Ladygina, D. A. Velikanov, and R. S. Iskhakov. "Magnetic anisotropy and core-shell structure origin of the biogenic ferrihydrite nanoparticles." Journal of Alloys and Compounds 851 (January 2021): 156753. http://dx.doi.org/10.1016/j.jallcom.2020.156753.

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Gorobets, Svitlana, Oksana Gorobets, Yuri Gorobets, and Maryna Bulaievska. "Chain‐Like Structures of Biogenic and Nonbiogenic Magnetic Nanoparticles in Vascular Tissues." Bioelectromagnetics 43, no. 2 (January 25, 2022): 119–43. http://dx.doi.org/10.1002/bem.22390.

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Telling, N. D., V. S. Coker, R. S. Cutting, G. van der Laan, C. I. Pearce, R. A. D. Pattrick, E. Arenholz, and J. R. Lloyd. "Remediation of Cr(VI) by biogenic magnetic nanoparticles: An x-ray magnetic circular dichroism study." Applied Physics Letters 95, no. 16 (October 19, 2009): 163701. http://dx.doi.org/10.1063/1.3249578.

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Angelova, R., L. Slavov, B. Blagoev, Ch Ghelev, D. Kovacheva, M. Iliev, V. Groudeva, and I. Nedkov. "Study of biogenic iron oxyhydroxide for application in electronics and biotechnology." Journal of Physics: Conference Series 2240, no. 1 (March 1, 2022): 012018. http://dx.doi.org/10.1088/1742-6596/2240/1/012018.

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Abstract The object of this study is a biogenic material obtained from neutrophilic sheath-forming iron bacteria of the genus Leptothrix cultivated in a specific medium. Light microscopy and scanning electron microscopy were used to characterize the biogenic product. The X-ray diffraction spectrum of the control sample (without inoculated bacteria) is presented to demonstrate the important role of the bacteria in the Fe2+ transformation. Unlike the biogenic product, where nanoparticles of lepidocrocite are present, no traces of stable single-phase iron oxide or oxyhydroxide were detected in the control sample. The study of the biogenic sample showed a lack of significant differences between the naturally obtained and the artificially produced sheaths. Magnetostriction effect measurements were conducted to probe how the different magnetic behavior at temperatures below and above the Neel temperature (50 - 77 K) could be used in possible applications of the material in actuating and sensing devices.

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Gandia, David, Lucía Gandarias, Lourdes Marcano, Iñaki Orue, David Gil-Cartón, Javier Alonso, Alfredo García-Arribas, Alicia Muela, and Mª Luisa Fdez-Gubieda. "Elucidating the role of shape anisotropy in faceted magnetic nanoparticles using biogenic magnetosomes as a model." Nanoscale 12, no. 30 (2020): 16081–90. http://dx.doi.org/10.1039/d0nr02189j.

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Singh, Kshitij RB, Pooja Singh, Ravindra Pratap Singh, and Jay Singh. "Bioderived Magnetic Iron Oxide Nanoparticles from Leaf Extract of Argyreia Nervosa for Electrochemical Biosensing of Pesticide." ECS Transactions 107, no. 1 (April 24, 2022): 16343–49. http://dx.doi.org/10.1149/10701.16343ecst.

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In this work, we have utilized leaves extract of Argyreia Nervosa (AN) to synthesize magnetic iron oxide nanoparticles by using the mixed precursor salt (ferric chloride and ferrous sulphate). After nanoparticles synthesis, it was initially characterized using Fourier Transform Infrared spectroscopy (FT-IR), UV–visible spectrophotometry (UV-Visible), Transmission Electron Microscope (TEM), and Scanning Electron Microscope (SEM). Further, characterization in this work is needed, namely AFM, XRD, and electrochemical studies (Differential Pulse Voltammetry (DPV) and Cyclic Voltammetry (CV)). The desired work is novel for synthesizing magnetic iron nanoparticles and their utilization for fabricating electrochemical biosensor devices for pesticide detection. Hence, in this study, we have focused on synthesizing magnetic iron oxide nanoparticles via the biogenic route of synthesis for fabricating an enzyme-biosensor for the determination of pesticides, which will open a new avenue for developing nanobiosensing devices through a greener and sustainable approach that is green/bioinspired/bioderived synthesis of nanomaterials that utilizes phytochemicals.

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Leila, Hatami Giklou Jajan, Mohsen Abolhassani, Seyed Nezamedin Hosseini, Behzad Ghareyazie, Leila Ma'mani, Delaram Doroud, Ava Behrouzi, and Masoud Ghorbani. "Effects of Electromagnetic Fields Exposure on the Production of Nanosized Magnetosome, Elimination of Free Radicals and Antioxidant Defense Systems in Magnetospirillum gryphiswaldense MSR-1." Journal of Nano Research 58 (June 2019): 20–31. http://dx.doi.org/10.4028/www.scientific.net/jnanor.58.20.

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Magnetotactic bacteria integrated magnetosomes, which are unique organelles that contain nanosized crystals of biogenic magnetic iron minerals with the ability to respond to the external magnetic fields. The biogenic magnetic nanoparticles (magnetosomes) show high biocompatibility in medical applications especially as scavengers to eliminate intracellular reactive oxygen species. The aim of this study was to highlight the impact of magnetosome formation and antioxidant systems in the suppression of oxidative stress on the magnetotactic bacteria cells. To assess the changes in ROS levels under different magnetic field intensity conditions, cells were cultured under the microaerobic condition in medium containing the high and low intensity of magnetic field. Treatment of magnetic field with an intensity of 500 mT during 50 hours bionormalization process of magnetotactic bacteria increased the antioxidant enzyme activity for eliminating of free radicals by 64%. We concluded that magnetosomes production plays an important role in decreasing or eliminating ROS. This is the first study to demonstrate that the magnetic field assisted magnetosome formation and antioxidants defense systems inMagnetospirillum gryphiswaldenseMSR-1.

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Luca, Delia, and Simona Miclăuş. "Two Dimensions Simulation of a Magnetotactic Bacteria Cell Exposed to an Electromagnetic Field at 3 GHz." International conference KNOWLEDGE-BASED ORGANIZATION 27, no. 3 (June 1, 2021): 48–54. http://dx.doi.org/10.2478/kbo-2021-0088.

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Abstract The effect of the presence of magnetite nanoparticles inside biological objects when they are exposed to microwaves has not yet been investigated completely. Microwaves magnetic hyperthermia is a field under development, and the use of biogenic magnetite is a relatively new vista. In this regard, the present approach presents a first step in a modeling-simulation process focused on the computation of the absorbed power distribution in bacteria cells containing native magnetite nanoparticles in the form of chains (magnetosomes). The presented simulations’ results refer to the simplest case of two-dimensional computation, which doesn’t take into consideration the geometric and magnetic anisotropy characteristics of the real magnetosomes.

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Pollithy, Anna, Tina Romer, Claus Lang, Frank D. Müller, Jonas Helma, Heinrich Leonhardt, Ulrich Rothbauer, and Dirk Schüler. "Magnetosome Expression of Functional Camelid Antibody Fragments (Nanobodies) in Magnetospirillum gryphiswaldense." Applied and Environmental Microbiology 77, no. 17 (July 15, 2011): 6165–71. http://dx.doi.org/10.1128/aem.05282-11.

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ABSTRACTNumerous applications of conventional and biogenic magnetic nanoparticles (MNPs), such as in diagnostics, immunomagnetic separations, and magnetic cell labeling, require the immobilization of antibodies. This is usually accomplished by chemical conjugation, which, however, has several disadvantages, such as poor efficiency and the need for coupling chemistry. Here, we describe a novel strategy to display a functional camelid antibody fragment (nanobody) from an alpaca (Lama pacos) on the surface of bacterial biogenic magnetic nanoparticles (magnetosomes). Magnetosome-specific expression of a red fluorescent protein (RFP)-binding nanobody (RBP)in vivowas accomplished by genetic fusion of RBP to the magnetosome protein MamC in the magnetite-synthesizing bacteriumMagnetospirillum gryphiswaldense. We demonstrate that isolated magnetosomes expressing MamC-RBP efficiently recognize and bind their antigenin vitroand can be used for immunoprecipitation of RFP-tagged proteins and their interaction partners from cell extracts. In addition, we show that coexpression of monomeric RFP (mRFP or its variant mCherry) and MamC-RBP results in intracellular recognition and magnetosome recruitment of RFP within living bacteria. The intracellular expression of a functional nanobody targeted to a specific bacterial compartment opens new possibilities forin vivosynthesis of MNP-immobilized nanobodies. Moreover, intracellular nanotraps can be generated to manipulate bacterial structures in live cells.

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Fischer, Anna, Manuel Schmitz, Barbara Aichmayer, Peter Fratzl, and Damien Faivre. "Structural purity of magnetite nanoparticles in magnetotactic bacteria." Journal of The Royal Society Interface 8, no. 60 (January 19, 2011): 1011–18. http://dx.doi.org/10.1098/rsif.2010.0576.

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Magnetosome biomineralization and chain formation in magnetotactic bacteria are two processes that are highly controlled at the cellular level in order to form cellular magnetic dipoles. However, even if the magnetosome chains are well characterized, controversial results about the microstructure of magnetosomes were obtained and its possible influence in the formation of the magnetic dipole is to be specified. For the first time, the microstructure of intracellular magnetosomes was investigated using high-resolution synchrotron X-ray diffraction. Significant differences in the lattice parameter were found between intracellular magnetosomes from cultured magnetotactic bacteria and isolated ones. Through comparison with abiotic control materials of similar size, we show that this difference can be associated with different oxidation states and that the biogenic nanomagnetite is stoichiometric, i.e. structurally pure whereas isolated magnetosomes are slightly oxidized. The hierarchical structuring of the magnetosome chain thus starts with the formation of structurally pure magnetite nanoparticles that in turn might influence the magnetic property of the magnetosome chains.

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Giun Tan, Woan, Wei Ming Ng, Jit Kang Lim, and Hui Xin Che. "Plantain Peel Mediated Green Synthesis Iron Oxide Nanoparticles, Surface Functionalization, and Them Performance towards Methylene Blue and Methyl Orange Dye Removal." International Journal of Engineering & Technology 7, no. 3.36 (May 6, 2018): 101. http://dx.doi.org/10.14419/ijet.v7i3.36.29087.

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Currently, green synthesis approach is used as the biocompatible, eco-friendly, and sustainable alternative of conventional approaches to synthesize iron oxide nanoparticles. In this work, magnetic iron oxide nanoparticles were synthesized by using plantain peel extract via green and biogenic approach. The surface of green synthesized iron oxide nanoparticles was functionalized to increase the stability of the nanoparticles and maintain the coexisting of both magnetic and catalytic property of the nanoparticles at the same time. Two kinds of surface functionalization structures were synthesized in this study, included silica core-iron oxide shell nanoparticles and silica core-PDDA polymerized iron oxide shell nanoparticles. The main concern of this study is the performance of bare and surface functionalized green synthesized nanoparticles. Methylene blue and methyl orange dyes were used as the model of dye removal test to indicate the feasibility of the synthesized nanocomposites. In summary, surface functionalized nanocomposites achieved higher dye removal efficiency than bare green synthesized iron oxide nanoparticles in both the methylene blue and methyl orange degradation test. Methylene blue dye was removed in higher rate than methyl orange dye due to the presence of negatively charged iron oxide nanoparticles with both the adsorptive and catalytic properties. At last, the components present in plantain peel extract were confirmed by using Fourier Transform Infrared Spectroscopy.

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Ankamwar, Balaprasad, and Saee Gharpure. "Non-antibacterial biogenic gold nanoparticles an ulterior drug carrier." Materials Research Express 6, no. 10 (September 18, 2019): 1050c7. http://dx.doi.org/10.1088/2053-1591/ab429f.

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Gorobets, Oksana, Svitlana Gorobets, and Marceli Koralewski. "Physiological origin of biogenic magnetic nanoparticles in health and disease: from bacteria to humans." International Journal of Nanomedicine Volume 12 (June 2017): 4371–95. http://dx.doi.org/10.2147/ijn.s130565.

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Nasibova, Aygun, Rovshan Khalilov, Huseyn Abiyev, Taras Kavetskyy, Boris Trubitsin, Cumali Keskin, Elham Ahmadian, and Aziz Eftekhari. "Study of Endogenous Paramagnetic Centers in Biological Systems from Different Areas." Concepts in Magnetic Resonance Part B 2021 (December 31, 2021): 1–5. http://dx.doi.org/10.1155/2021/6787360.

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Plant leaves (Eldar pine (Pinus eldarica M.), fig (Ficus carica L.), and olive (Olea europaea L.)), collected in territories with different ecological conditions, of the Absheron Peninsula (Azerbaijan Republic) were studied by electron paramagnetic resonance spectroscopy (EPR). The generation of nanophase iron oxide magnetic particles in biological systems under the influence of stress factors was revealed. It was found that the process of biomineralization plays a role in the formation of biogenic iron oxide magnetic nanoparticles in plants and the generation of magnetite crystals in biological tissues, and stress factors have a stimulating effect on this phenomenon.

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Byrne, J. M., H. Muhamadali, V. S. Coker, J. Cooper, and J. R. Lloyd. "Scale-up of the production of highly reactive biogenic magnetite nanoparticles using Geobacter sulfurreducens." Journal of The Royal Society Interface 12, no. 107 (June 2015): 20150240. http://dx.doi.org/10.1098/rsif.2015.0240.

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Although there are numerous examples of large-scale commercial microbial synthesis routes for organic bioproducts, few studies have addressed the obvious potential for microbial systems to produce inorganic functional biomaterials at scale. Here we address this by focusing on the production of nanoscale biomagnetite particles by the Fe(III)-reducing bacterium Geobacter sulfurreducens , which was scaled up successfully from laboratory- to pilot plant-scale production, while maintaining the surface reactivity and magnetic properties which make this material well suited to commercial exploitation. At the largest scale tested, the bacterium was grown in a 50 l bioreactor, harvested and then inoculated into a buffer solution containing Fe(III)-oxyhydroxide and an electron donor and mediator, which promoted the formation of magnetite in under 24 h. This procedure was capable of producing up to 120 g of biomagnetite. The particle size distribution was maintained between 10 and 15 nm during scale-up of this second step from 10 ml to 10 l, with conserved magnetic properties and surface reactivity; the latter demonstrated by the reduction of Cr(VI). The process presented provides an environmentally benign route to magnetite production and serves as an alternative to harsher synthetic techniques, with the clear potential to be used to produce kilogram to tonne quantities.

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Venkateswarlu, Sada, and Minyoung Yoon. "Rapid removal of cadmium ions using green-synthesized Fe3O4 nanoparticles capped with diethyl-4-(4 amino-5-mercapto-4H-1,2,4-triazol-3-yl)phenyl phosphonate." RSC Advances 5, no. 80 (2015): 65444–53. http://dx.doi.org/10.1039/c5ra10628a.

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Water-dispersible diethyl-4-(4-amino-5-mercapto-4H-1,2,4-triazol-3-yl)phenyl phosphonate (DEAMTPP)-capped biogenic Fe₃O₄ magnetic nanocomposite has been synthesized using Ananas comosus peel pulp extract for rapid removal of Cd(ii) ions from water.

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Balaev, D. A., A. A. Krasikov, A. A. Dubrovskii, O. A. Bayukov, S. V. Stolyar, R. S. Iskhakov, V. P. Ladygina, and R. N. Yaroslavtsev. "The effect of low-temperature heat treatment on the magnetic properties of biogenic ferrihydrite nanoparticles." Technical Physics Letters 41, no. 7 (July 2015): 705–9. http://dx.doi.org/10.1134/s1063785015070172.

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Pan, Yu, Na Li, Jianshuai Mu, Runhong Zhou, Yan Xu, Daizong Cui, Yan Wang, and Min Zhao. "Biogenic magnetic nanoparticles from Burkholderia sp. YN01 exhibiting intrinsic peroxidase-like activity and their applications." Applied Microbiology and Biotechnology 99, no. 2 (July 17, 2014): 703–15. http://dx.doi.org/10.1007/s00253-014-5938-6.

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Akbari-Karadeh, Somayeh, Seyed Mahmoud Reza Aghamiri, Parisa Tajer-Mohammad-Ghazvini, and Saeid Ghorbanzadeh-Mashkani. "Radiolabeling of Biogenic Magnetic Nanoparticles with Rhenium-188 as a Novel Agent for Targeted Radiotherapy." Applied Biochemistry and Biotechnology 190, no. 2 (August 8, 2019): 540–50. http://dx.doi.org/10.1007/s12010-019-03079-x.

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Althaaly, Azzah Fawaz Muneer, Shaeel Ahmad Al-Thabaiti, and Zaheer Khan. "Biogenic silver nanoparticles: synthesis, characterization, and degradation of congo red." Journal of Materials Science: Materials in Electronics 33, no. 7 (January 24, 2022): 4450–66. http://dx.doi.org/10.1007/s10854-021-07636-1.

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Gorobets, Svitlana, Nina Ilchuk, Iryna Demianenko, and Maria Bannikova. "The Effect of Magnetite Nanoparticles on the Growth and Development of Nicotiana Tabacum Plants in Vivo and in Vitro Culture." Innovative Biosystems and Bioengineering 5, no. 3 (September 26, 2021): 178–88. http://dx.doi.org/10.20535/ibb.2021.5.3.233267.

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Background. Nanomaterials are easily modified and have unique characteristics associated with a large reactive surface Due to these properties, nanomaterials are used in various branches of sciences and technology, such as pharmaceuticals, biotechnology, chemical technology, etc. Recently, the effect of magnetite nanoparticles on the morphological properties of plants has been actively studied for their further use as nanoadditives to increase yields and improve the properties of agricultural plants. Tobacco (Nicotiana tabacum) is a model object of plant biotechnology, it is used to study the effect of various factors on dicotyledonous plants, so it was chosen to study the effect of magnetite on the growth, development, and mass accumulation by plants. Objective. We are aimed to study the effect of magnetite nanoparticles on the growth and development of Nicotiana tabacum in vivo and in vitro. Methods. The ability of tobacco to produce biogenic magnetic nanoparticles by searching for mammal proteins homologues in theNicotiana tabacum proteome using the Blast NCBI program was studied using comparative genomics methods. The plants were divided into groups (control, magnetite nanoparticle concentration 0.1 mg/cm3, magnetite nanoparticle concentration 1 mg/cm3) for both in vivo and in vitro experiments. Analysis of plant parameters was performed every 14 days to study the dynamics of the effects of magnetite nanoparticles. Results. It was determined that magnetite nanoparticles at a concentration of 0.1 mg/cm3 in culture in vitro and in vivo significantly affect the growth of the root system and sprouts of Nicotiana tabacum. On the 56th day of plant cultivation in vitro on a salivary medium supplemented with magnetite nanoparticles at a concentration of 0.1 mg/cm3, an increase in the shoot length by 13.3%, root length by 31.7%, and the mass of absolutely dry substances by 18.75% was observed compared to the control. Treatment of magnetite nanoparticles with a suspension at a concentration of 0.1 mg/cm3 led to more pronounced results when growing tobacco in vivo. So, on the56th day, the root length increased by 23.3%, the length of the shoot – by 19.2%, and the mass of absolutely dry substances – by2 times, the first leaves appeared 2 days earlier compared to the control. The addition of magnetite nanoparticles to the substrate on which the plants were grown in vivo at a concentration of 1 mg/cm3 inhibits the growth of tobacco. Conclusions. Studies have shown the expediency of using magnetic nanoparticles at a concentration of 0.1 mg/cm3 as nanofertilizers in tobacco cultivation.

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Estevez, María Belén, Scott G. Mitchell, Ricardo Faccio, and Silvana Alborés. "Biogenic silver nanoparticles: understanding the antimicrobial mechanism using Confocal Raman Microscopy." Materials Research Express 6, no. 12 (January 10, 2020): 1250f5. http://dx.doi.org/10.1088/2053-1591/ab6636.

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Wang, Huapei, Jun Wang, Yu-chen Karen Chen-Wiegart, and Dennis V. Kent. "Quantified abundance of magnetofossils at the Paleocene–Eocene boundary from synchrotron-based transmission X-ray microscopy." Proceedings of the National Academy of Sciences 112, no. 41 (September 29, 2015): 12598–603. http://dx.doi.org/10.1073/pnas.1517475112.

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The Paleocene–Eocene boundary (∼55.8 million years ago) is marked by an abrupt negative carbon isotope excursion (CIE) that coincides with an oxygen isotope decrease interpreted as the Paleocene–Eocene thermal maximum. Biogenic magnetite (Fe3O4) in the form of giant (micron-sized) spearhead-like and spindle-like magnetofossils, as well as nano-sized magnetotactic bacteria magnetosome chains, have been reported in clay-rich sediments in the New Jersey Atlantic Coastal Plain and were thought to account for the distinctive single-domain magnetic properties of these sediments. Uncalibrated strong field magnet extraction techniques have been typically used to provide material for scanning and transmission electron microscopic imaging of these magnetic particles, whose concentration in the natural sediment is thus difficult to quantify. In this study, we use a recently developed ultrahigh-resolution, synchrotron-based, full-field transmission X-ray microscope to study the iron-rich minerals within the clay sediment in their bulk state. We are able to estimate the total magnetization concentration of the giant biogenic magnetofossils to be only ∼10% of whole sediment. Along with previous rock magnetic studies on the CIE clay, we suggest that most of the magnetite in the clay occurs as isolated, near-equidimensional nanoparticles, a suggestion that points to a nonbiogenic origin, such as comet impact plume condensates in what may be very rapidly deposited CIE clays.

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Schwarz, Sebastian, Fabiana Fernandes, Laura Sanroman, Michael Hodenius, Claus Lang, Uwe Himmelreich, Thomas Schmitz-Rode, et al. "Synthetic and biogenic magnetite nanoparticles for tracking of stem cells and dendritic cells." Journal of Magnetism and Magnetic Materials 321, no. 10 (May 2009): 1533–38. http://dx.doi.org/10.1016/j.jmmm.2009.02.081.

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Ahmed, Amany, Adam Abagana, Daizong Cui, and Min Zhao. "De Novo Iron Oxide Hydroxide, Ferrihydrite Produced by Comamonas testosteroni Exhibiting Intrinsic Peroxidase-Like Activity and Their Analytical Applications." BioMed Research International 2019 (March 28, 2019): 1–14. http://dx.doi.org/10.1155/2019/7127869.

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Natural enzyme mimics have attracted considerable attention due to leakage of enzymes and their easy denaturation during their storage and immobilization procedure. Here in this study, for the first time, a new iron oxide hydroxide, ferrihydrite – Fe1.44O0.32 (OH) 3.68 magnetic nanoparticles were synthesized by bacterial strain named Comamonas testosteroni. The characterization of the produced magnetic nanoparticles was confirmed by transmission electron microscopy (TEM), Fourier-transform spectroscopy (FTIR), X-ray diffraction (XRD), and magnetization hysteresis loops. Further, these extracted nanoparticles were proven to have biogenic magnetic behavior and to exhibit enhanced peroxidase-like activity. It is capable of catalyzing the oxidation of 3, 3′, 5, 5′-Tetramethylbenzidine (TMB) by H2O2 to produce blue color (typical color reactions). Catalysis was examined to follow Michaelis-Menton kinetics and the good affinity to both H2O2 and TMB. The Km value of the Fe1.44O0.32 (OH) 3.68 with H2O2 and TMB as the substrate was 0.0775 and 0.0155 mM, respectively, which were lower than that of the natural enzyme (HRP). Experiments of electron spin resonance (ESR) spectroscopy proved that the BMNPs could catalyze H2O2 to produce hydroxyl radicals. As a new peroxidase mimetic, the BMNPs were exhibited to offer a simple, sensitive, and selective colorimetric method for determination of H2O2 and glucose and efficiently catalyze the detection of glucose in real blood samples.

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Khan, Zaheer, and Shaeel Ahmad Al-Thabaiti. "Biogenic silver nanoparticles: Green synthesis, encapsulation, thermal stability and antimicrobial activities." Journal of Molecular Liquids 289 (September 2019): 111102. http://dx.doi.org/10.1016/j.molliq.2019.111102.

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Wani, Irshad Ahmad. "Review—Recent Advances in Biogenic Silver Nanoparticles & NanoComposite Based Plasmonic-Colorimetric and Electrochemical Sensors." ECS Journal of Solid State Science and Technology 10, no. 4 (April 1, 2021): 047003. http://dx.doi.org/10.1149/2162-8777/abf2df.

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Anjan Kumar, G. C., Yadav D. Bodke, B. Manjunatha, N. D. Satyanarayan, B. N. Nippu, and Muthipeedika Nibin Joy. "Novel synthesis of 3-(Phenyl) (ethylamino) methyl)-4-hydroxy-2H-chromen-2-one derivatives using biogenic ZnO nanoparticles and their applications." Chimica Techno Acta 9, no. 1 (January 21, 2022): 20229104. http://dx.doi.org/10.15826/chimtech.2022.9.1.04.

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The present work describes the novel synthesis of 3, 3'-((phenyl) (ethylamino) methyl)-4-hydroxy-2H-chromen-2-one derivatives catalyzed by biogenic ZnO nanoparticles. The synthesized heterocyclic compounds were characterized by fourier-transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) andmass spectrometric techniques. Absorption, distribution, metabolism and excretion properties and various toxicities (ADMET) studies and in silico molecular docking studies were carried out for the synthesized compounds. The synthesized compounds were screened for their efficacy towards the antioxidant activity and were subjected to corrosion inhibition study towards the mild steel in acidic medium by weight loss method. Additionally, the recyclability of the employed catalyst was studied.

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Gorobets, Svitlana, Oksana Gorobets, Iryna Kovalchuk, and Liubov Yevzhyk. "Determination of Potential Producers of Biogenic Magnetic Nanoparticles Among the Fungi Representatives of Ascomycota and Basidiomycota Divisions." Innovative Biosystems and Bioengineering 2, no. 4 (December 20, 2018): 232–45. http://dx.doi.org/10.20535/ibb.2018.2.4.147310.

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Lingamdinne, Lakshmi Prasanna, Yoon-Young Chang, Jae-Kyu Yang, Jiwan Singh, Eun-Ha Choi, Masaharu Shiratani, Janardhan Reddy Koduru, and Pankaj Attri. "Biogenic reductive preparation of magnetic inverse spinel iron oxide nanoparticles for the adsorption removal of heavy metals." Chemical Engineering Journal 307 (January 2017): 74–84. http://dx.doi.org/10.1016/j.cej.2016.08.067.

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Lin, Wei, Joseph L. Kirschvink, Greig A. Paterson, Dennis A. Bazylinski, and Yongxin Pan. "On the origin of microbial magnetoreception." National Science Review 7, no. 2 (May 21, 2019): 472–79. http://dx.doi.org/10.1093/nsr/nwz065.

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Abstract A broad range of organisms, from prokaryotes to higher animals, have the ability to sense and utilize Earth's geomagnetic field—a behavior known as magnetoreception. Although our knowledge of the physiological mechanisms of magnetoreception has increased substantially over recent decades, the origin of this behavior remains a fundamental question in evolutionary biology. Despite this, there is growing evidence that magnetic iron mineral biosynthesis by prokaryotes may represent the earliest form of biogenic magnetic sensors on Earth. Here, we integrate new data from microbiology, geology and nanotechnology, and propose that initial biomineralization of intracellular iron nanoparticles in early life evolved as a mechanism for mitigating the toxicity of reactive oxygen species (ROS), as ultraviolet radiation and free-iron-generated ROS would have been a major environmental challenge for life on early Earth. This iron-based system could have later been co-opted as a magnetic sensor for magnetoreception in microorganisms, suggesting an origin of microbial magnetoreception as the result of the evolutionary process of exaptation.

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Journal articles on the topic 'Biogenic magnetic nanoparticles'

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