Relevant bibliographies by topics / Biogenic magnetic nanoparticles

Academic literature on the topic 'Biogenic magnetic nanoparticles'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "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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Dissertations / Theses on the topic "Biogenic magnetic nanoparticles"

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Pardoe, Heath. "In vivo measurement and imaging of ferrimagnetic particle concentrations in biological tissues." University of Western Australia. School of Physics, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0060.

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[Truncated abstract] Clinical magnetic resonance imaging (MRI) scanners were used to investigate the measurement and imaging of ferrimagnetic particle concentrations in biological tissues in vivo. The presence of ferrimagnetic particles tends to increase the proton transverse relaxation rate (R2) of water protons in tissue. A quantitative image of R2 can be generated using a series of single spin echo magnetic resonance images acquired using clinical MRI scanners and analysing the images using techniques based on that reported by Clark and St. Pierre (2000). If ferrimagnetic particles have a high enough concentration, there is a monotonic relationship between particle concentration and R2; therefore an image of R2 gives a map of the ferrimagnetic particle concentration in the tissue. These techniques were used to investigate the feasibility of in vivo measurement of the concentration and distribution of both synthetic and biogenic ferrimagnetic particles in tissue. Rabbit liver was loaded with ferrimagnetic particles of ?-Fe2O3 (designed for magnetic hyperthermia treatment of liver tumours) by injecting various doses of a suspension of the particles into the hepatic artery in vivo. R2 images of the livers in vivo, excised, and dissected were generated from a series of single spin-echo images. Mean R2 values for samples of ferrimagnetic-particle-loaded liver dissected into approximate 1 cm cubes were found to linearly correlate with tissue iron concentration over the range from approximately 0.1 to at least 2.7 mg Fe/g dry tissue when measured at room temperature. Changing the temperature of ferrimagnetic-particle-loaded samples of liver from 1?C to 37?C had no observable effect on tissue R2 values. However, a small but significant decrease in R2 was found for control samples containing no ferrimagnetic material on raising the temperature from 1?C to 37?C. Both chemically measured iron ii concentrations and mean R2 values for rabbit livers with implanted tumours tended to be higher than those measured for tumour-free liver. This study indicates that tissue R2 measurement and imaging by nuclear magnetic resonance may have a useful role in magnetic hyperthermia therapy protocols for the treatment of liver cancer. In order to investigate the use of clinical MRI scanners to measure biogenic ferrimagnetic particle concentrations in human brain tissue, agar gel based phantoms containing ferrimagnetic particles were made in order to determine the lower concentration detection limit for such particles in a homogenous medium. Magnetite/maghemite nanoparticles were synthesized in the presence of either dextran or polyvinyl alcohol, yielding cluster- and necklace-like aggregates, respectively. Magnetization, Mossbauer spectroscopy, and microscopy measurements indicated that the arrangement of the particles within the aggregates affects the magnetic properties of the particles resulting in smaller particles in the clusters having higher superparamagnetic blocking temperatures than larger particles in the necklaces.
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Пономаренко, Дарина Сергіївна. "Біотехнологія отримання магнітокерованого біосорбенту з активного мулу." Master's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/39647.

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Магістерська дисертація: 84 сторінки, 2 рисунки, 37 таблиць, 81 джерела. Біосорбція є одним з універсальних методів очистки води від іонів важких металів, що є економічно вигідною та екологічною альтернативою іншим промисловим методам. Однією з переваг даного методу є можливість застосування низьковартісних сорбентів, таких, як відходи біосами. Тому актуальним є пошук дешевого та простого для вилучення біологічного сорбенту, яким може стати активний мул водоочисних споруд. Метою роботи є визначення оптимального режиму отримання магнітокерованої фракції активного мулу для виготовлення магнітокерованого сорбенту на його основі. Об’єкти дослідження: геноми і протеоми мікроорганізмів активного мулу, присутніх в зразку, геном магнітотаксисної бактерії (МТБ) Magnetospirillum gryphiswaldense MSR-1, біомаса активного мулу «Чернігівводоканалу», високоградієнтна магнітна сепарація, високоградієнтні феромагнітні насадки. Предмети дослідження: ефективність вилучення магнітокерованої фракції активного мулу методом високоградієнтної магнітної сепарації. В роботі використано такі методи дослідження: біоінформатичний, метод високоградієнтної магнітної сепарації. В ході дослідження було показано, що мікроорганізми в складі активного мулу є потенційними продуцентами БМН; визначено, що найбільш ефективним для вилучення магнітокерованої фази активного мулу є режим швидкості 1,5 мл/хв та феромагнітна насадка у вигляді сітки – ефективність склала близько 20%.
Master’s thesis: 84 pages, 2 figures, 37 tables, 81 sources. Biosorption is an innovative method of removing heavy metal pollution, it is economically beneficial and ecological alternative to other industrial methods. One of its main benefits is an ability to use low cost biological adsorbents, as a waste biomass. Therefore it is important to search low cost, effective and easy to extract adsorbent, and waste biomass of activated sludge can be a material wich possesses such qualities. The aim of this work is to find an optimal speed mode and matrix to extract magnetically controlled phase of activated sludge for further sorbent production. Objects of study: genomes and proteomes of microorganisms of activated sludge, genome of magnetotaxis bacteria Magnetospirillum ryphiswaldense MSR-1, activated sludge biomass from «Chernihivvodokanal» plant, high gradient magnetic separation, high gradient ferromagnetic matrixes. Subject of study: the efficiency of activated sludge magnetically controlled phase removal using high efficiency magnetic separation method. The following research methods are used: bioinformatics, high efficiency magnetic separation method. The study shows that among microorganisms of activated sludge potential producers of BMN are found; the most efficient separation mode was 1,5 ml/min using ferromagnetic mesh as a matrix – approximately 20%.
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Byrne, James. "Biogenic magnetite nanoparticles : development and optimization for potential applications." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/biogenic-magnetite-nanoparticles-development-and-optimization-for-potential-applications(3a218090-e28f-452e-8924-4b6314eca514).html.

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The bioproduction of magnetite (Fe3O4) nanoparticles was demonstrated through the reduction of amorphous Fe(III)-oxyhydroxide starting materials by the dissimilatory iron reducing bacterium Geobacter sulfurreducens in an environmentally benign method. Magnetite nanoparticles have magnetic characteristics coupled with a high surface area to volume ratio and biogenically produced magnetite often has a highly reactive surface Fe(II) layer. Through the work described in this thesis, the properties of magnetite nanoparticles were manipulated in several different ways. The control of particle size was achieved through the adjustment of the total amount of bacteria (biomass) introduced at the start of the Fe(III)-oxyhydroxide reduction process. High concentrations of bacteria led to the formation of small (~10 nm) nanoparticles whereas low concentrations led to larger (~50 nm) particle formation. Additional mineral phases were formed, with goethite and siderite observed for very low and very high bacterial concentrations respectively. The change in particle size and additional mineral phases formed were attributed to the rate and extent of Fe(II) formation, linked to changes in biomass loadings, with high biomass releasing high concentrations of Fe(II) and low biomass releasing low concentrations of Fe(II).The control of magnetic properties was achieved by the incorporation of transition metal dopants including zinc and cobalt into the crystal structure of the magnetite, producing nanoparticles of the form MxFe3-xO4, (M=Zn or Co). The different dopants substitute into the crystal structure in different locations (as determined through X-ray absorption and Mӧssbauer spectroscopies). Zinc has a preference for replacing Fe(III) in tetrahedral coordination, resulting in a decrease in the anti-ferromagnetic component between octahedral and tetrahedral lattice sites, leading to an increase in saturation magnetization of the material (>50 %) compared to stoichiometric magnetite. Cobalt has a strong affinity to replace Fe(II) in octahedral coordination which results in an increase in the measured coercivity without significantly decreasing the saturation magnetization. The biotechnological potential of biogenic magnetite was also investigated through an appraisal of Fe(II)-mediated chromate (Cr(VI)) remediation. Decreasing particle size (i.e. increasing surface area to volume ratio) led to an enhanced ability to reduce highly toxic Cr(VI) to non-toxic Cr(III). In separate experiments, cobalt doping in magnetite also significantly increased the effectiveness of the nanomaterial for use in magnetic hyperthermia treatments, which could ultimately be used for cancer therapy. Finally, the scalability of biogenic magnetite production was shown. Geobacter sulfurreducens growth in batch culture and subsequent iron transformation stages were significantly increased in scale by factors of 500× and 1000× respectively. This could pave the way for future commercial production of biogenic magnetite for use in many different applications.
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Book chapters on the topic "Biogenic magnetic nanoparticles"

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Papaefthymiou, Georgia C. "Biogenic Magnetic Nanoparticles." In Nanomagnetism, 211–34. Boca Raton: Chapman and Hall/CRC, 2022. http://dx.doi.org/10.1201/9781315157016-9.

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Papaefthymiou, Georgia. "Biogenic and Biomimetic Magnetic Nanoparticles and Their Assemblies." In Magnetic Nanoparticle Assemblies, 1–44. Pan Stanford, 2014. http://dx.doi.org/10.1201/b15657-2.

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"- Biogenic and Biomimetic Magnetic Nanoparticles and Their Assemblies." In Magnetic Nanoparticle Assemblies, 14–57. Jenny Stanford Publishing, 2014. http://dx.doi.org/10.1201/b15657-3.

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Gautam, Pavan Kumar, Sushmita Banerjee, and Sintu Kumar Samanta. "Sustainable approaches for synthesis of biogenic magnetic nanoparticles and their water remediation applications." In Sustainable Nanotechnology for Environmental Remediation, 157–78. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-824547-7.00021-7.

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Nascimento Correa, Tarcisio, Igor Nunes Taveira, Rogerio Presciliano de Souza Filho, and Fernanda de Avila Abreu. "Biomineralization of Magnetosomes: Billion-Year Evolution Shaping Modern Nanotools." In Biomineralization [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94465.

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Biomineralization in the microbial realm usually gives origin to finely structured inorganic nanomaterials. Perhaps, one of the most elegant bioinorganic processes found in nature is the iron biomineralization into magnetosomes, which is performed by magnetotactic bacteria. A magnetosome gene cluster within the bacterial genome precisely regulates the mineral synthesis. The spread and evolution of this ability among bacteria are thought to be a 2,7-billion-year process mediated by horizontal gene transfers. The produced magnetite or greigite nanocrystals coated by a biological membrane have a narrow diameter dispersibility, a highly precise morphology, and a permanent magnetic dipole due to the molecular level control. Approaches inspired by this bacterial biomineralization mechanism can imitate some of the biogenic nanomagnets characteristics in the chemical synthesis of iron oxide nanoparticles. Thus, this chapter will give a concise overview of magnetosome synthesis’s main steps, some hypotheses about the evolution of magnetosomes’ biomineralization, and approaches used to mimic this biological phenomenon in vitro.
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