Bibliographies thématiques / Iron oxide superparamagnetic nanoparticles

Littérature scientifique sur le sujet « Iron oxide superparamagnetic nanoparticles »

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Publié le 13 avril 2024

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Articles de revues sur le sujet "Iron oxide superparamagnetic nanoparticles"

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Lu, Qizheng, Haibo Liu, Hao Zheng, Youming Zhang, Jinbo Ou, Jieyun You, Qi Zhang et al. « SS-31 Modification Inhibits the Proinflammatory Effect on Macrophages Induced by Superparamagnetic Iron Oxide Nanoparticles ». Journal of Biomedical Nanotechnology 18, no 5 (1 mai 2022) : 1413–22. http://dx.doi.org/10.1166/jbn.2022.3359.

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Superparamagnetic iron oxide nanoparticles can induce macrophage polarization into the proinflammatory M1-type. This adverse effect is very likely to restrict the applications of superparamagnetic iron oxide nanoparticles in various inflammatory medical conditions. To inhibit the proinflammatory effect, the mitochondrial-targeted antioxidant peptide SS-31 was physically adsorbed on superparamagnetic iron oxide nanoparticles to develop superparamagnetic iron oxide nanoparticles@SS-31. The macrophages (RAW 264.7) were incubated with superparamagnetic iron oxide nanoparticles or superparamagnetic iron oxide nanoparticles@SS-31 at a concentration of 50 μg Fe3O4/mL for 24 hours. Compared to the superparamagnetic iron oxide nanoparticles group, the superparamagnetic iron oxide nanoparticles@SS-31 group demonstrated significantly reduced cell damage, as evidenced by the inhibition of cell viability loss, early cell apoptosis and the production of reactive oxygen species. Moreover, the proinflammatory factor TNF-α and M1-type cell surface markers CD86 and CD80 were significantly downregulated in the superparamagnetic iron oxide nanoparticles@SS-31 group as shown by enzyme-linked immunosorbent assay and flow cytometric analysis. Notably, compared with the superparamagnetic iron oxide nanoparticles group, levels of the anti-inflammatory factors IL-10, TGF-β and the M2-type cell surface marker CD163 were markedly upregulated in the superparamagnetic iron oxide nanoparticles@SS-31 group. In addition, severe disruption of the mitochondrial ultrastructure was observed by transmission electron microscopy in the superparamagnetic iron oxide nanoparticles group, but the superparamagnetic iron oxide nanoparticles@SS-31 group displayed structurally intact mitochondria. All of these results suggest that superparamagnetic iron oxide nanoparticles can promote macrophage M1-type polarization by inducing oxidative stress and mitochondrial damage, while superparamagnetic iron oxide nanoparticles@SS-31 can significantly inhibit superparamagnetic iron oxide nanoparticles-induced toxicity by releasing SS-31 to exert mitochondrial-targeted antioxidant and anti-inflammatory effects, indicating that the strategy of coloading the SS-31 peptide into superparamagnetic iron oxide nanoparticles has the potential to alleviate superparamagnetic iron oxide nanoparticles-induced proinflammatory effects.
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Neumaier, Carlo Emanuele, Gabriella Baio, Silvano Ferrini, Giorgio Corte et Antonio Daga. « MR and Iron Magnetic Nanoparticles. Imaging Opportunities in Preclinical and Translational Research ». Tumori Journal 94, no 2 (mars 2008) : 226–33. http://dx.doi.org/10.1177/030089160809400215.

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Ultrasmall superparamagnetic iron oxide nanoparticles and magnetic resonance imaging provide a non-invasive method to detect and label tumor cells. These nanoparticles exhibit unique properties of superparamagnetism and can be utilized as excellent probes for magnetic resonance imaging. Most work has been performed using a magnetic resonance scanner with high field strength up to 7 T. Ultrasmall superparamagnetic iron oxide nanoparticles may represent a suitable tool for labeling molecular probes that target specific tumor-associated markers for in vitro and in vivo detection by magnetic resonance imaging. In our study, we demonstrated that magnetic resonance imaging at 1.5 T allows the detection of ultrasmall superparamagnetic iron oxide nanoparticle conjugated antibody specifically bound to human tumor cells in vitro and in vivo, and that the magnetic resonance signal intensity correlates with the concentration of ultrasmall superparamagnetic iron oxide nanoparticle antibody used and with the antigen density at the cell surface. The experiments were performed using two different means of targeting: direct and indirect magnetic tumor targeting. The imaging of tumor antigens using immunospecific contrast agents is a rapidly evolving field, which can potentially aid in early disease detection, monitoring of treatment efficacy, and drug development. Cell labeling by iron oxide nanoparticles has emerged as a potentially powerful tool to monitor trafficking of a large number of cells in the cell therapy field. We also studied the labeling of natural killer cells with iron nanoparticles to a level that would allow the detection of their signal intensity with a clinical magnetic resonance scanner at 1.5 T. Magnetic resonance imaging and iron magnetic nanoparticles are able to increase the accuracy and the specificity of imaging and represent new imaging opportunities in preclinical and translational research.
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Sibov, Tatiana Taís, Liza Aya Mabuchi Miyaki, Javier Bustamante Mamani, Luciana Cavalheiro Marti, Luiz Roberto Sardinha, Lorena Favaro Pavon, Daniela Mara de Oliveira, Walter Humberto Cardenas et Lionel Fernel Gamarra. « Evaluation of umbilical cord mesenchymal stem cell labeling with superparamagnetic iron oxide nanoparticles coated with dextran and complexed with Poly-L-lysine ». Einstein (São Paulo) 10, no 2 (juin 2012) : 180–88. http://dx.doi.org/10.1590/s1679-45082012000200011.

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OBJECTIVE: The objective of this study was to evaluate the effect of the labeling of umbilical cord vein derived mesenchymal stem cells with superparamagnetic iron oxide nanoparticles coated with dextran and complexed to a non-viral transfector agent transfector poly-L-lysine. METHODS: The labeling of mesenchymal stem cells was performed using the superparamagnetic iron oxide nanoparticles/dextran complexed and not complexed to poly-L-lysine. Superparamagnetic iron oxide nanoparticles/dextran was incubated with poly-L-lysine in an ultrasonic sonicator at 37°C for 10 minutes for complex formation superparamagnetic iron oxide nanoparticles/dextran/poly-L-lysine by electrostatic interaction. Then, the mesenchymal stem cells were incubated overnight with the complex superparamagnetic iron oxide nanoparticles/dextran/poly-L-lysine and superparamagnetic iron oxide nanoparticles/dextran. After the incubation period the mesenchymal stem cells were evaluated by internalization of the complex superparamagnetic iron oxide nanoparticles/dextran/poly-L-lysine and superparamagnetic iron oxide nanoparticles/dextran by Prussian Blue stain. Cellular viability of labeled mesenchymal stem cells was evaluated by cellular proliferation assay using 5,6-carboxy-fluorescein-succinimidyl ester method and apoptosis detection by Annexin V- Propidium Iodide assay. RESULTS: mesenchymal stem cells labeled with superparamagnetic iron oxide nanoparticles/dextran without poly-L-lysine not internalized efficiently the superparamagnetic iron oxide nanoparticles due to its low presence detected within cells. Mesenchymal stem cells labeled with the complex superparamagnetic iron oxide nanoparticles/dextran/poly-L-lysine efficiently internalized the superparamagnetic iron oxide nanoparticles due to greater presence in the cells interior. The viability and apoptosis assays demonstrated that the mesenchymal stem cells labeled and not labeled respectively with the superparamagnetic iron oxide nanoparticles/dextran/poly-L-lysine continue to proliferate over seven days and the percentage of cells in early or late apoptosis is low compared to the percentage of live cells over the three days. CONCLUSION: Our results showed that the use of poly-L-lysine complexed with superparamagnetic iron oxide nanoparticles/dextran provides better internalization of these superparamagnetic iron oxide nanoparticles in mesenchymal stem cells Thus, we demonstrated that this type of labeling is not cytotoxic to the mesenchymal stem cells, since the viability and apoptosis assays showed that the cells remain alive and proliferating. The efficiency of this type of labeling in mesenchymal stem cells can provide non-invasive methods for monitoring these cells in vivo.
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Lüdtke-Buzug, Kerstin, et Zuzana Penxová. « Superparamagnetic Iron Oxide Nanoparticles ». Current Directions in Biomedical Engineering 5, no 1 (1 septembre 2019) : 307–9. http://dx.doi.org/10.1515/cdbme-2019-0077.

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AbstractThe direct detection of the spatial distribution of Superparamagnetic Iron Oxide Nanoparticles (SPIONs) as a tracer for Magnetic Particle Imaging (MPI) enables threedimensional functional images with high spatial and temporal resolution. The commercially available tracers have not been developed primarily for MPI. Therefore, they do not sufficiently contribute to the desired image quality. Hence, optimizing the SPIONs during the production process is of interest. A peculiarity of the here presented synthesis method - the alkaline coprecipitation - is that this process takes place under ultrasonic control. The use of ultrasound creates extraordinary reaction conditions through sonochemical phenomena, such as formation, growth and implosive collapse of cavitation bubbles within a liquid. In addition, the ultrasonic waves and the oscillation of the medium improve the mixing process and thus ensure the homogenization during the synthesis. The objective of this study is the variation of ultrasonic frequencies and the type of used dextran as coating material, to provide SPIONs with better performance for MPI and more suitable properties for in vivo application. The focus of the optimization is to increase the magnetite core size while simultaneously reducing the hydrodynamic size. The experiments have shown that both, the ultrasound frequency and the molecular weight of used dextran, influence the properties of the SPIONs.
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Anzai, Yoshimi. « Superparamagnetic Iron Oxide Nanoparticles ». Topics in Magnetic Resonance Imaging 15, no 2 (avril 2004) : 103–11. http://dx.doi.org/10.1097/01.rmr.0000130602.65243.87.

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Vazhenina I.G., Stolyar S.V., Tyumentseva A.V., Volochaev M.N., Iskhakov R.S., Komogortsev S.V., Pyankov V. F. et Nikolaeva E.D. « Study of magnetic iron oxide nanoparticles coated with silicon oxide by ferromagnetic method ». Physics of the Solid State 65, no 6 (2023) : 884. http://dx.doi.org/10.21883/pss.2023.06.56095.01h.

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Magnetic nanoparticles of magnetite with a size of ~8 nm synthesized with a different type of coating were studied by ferromagnetic resonance in the temperature range from 7 to 300 K. The features of the experimental temperature dependences of the parameters of the ferromagnetic resonance curve (the magnitude of the resonant field, line width and intensity) and their approximation allowed us to estimate the values of characteristic temperatures. Firstly, the value of the Vervey temperature and the dependence of its value on the type of coating were determined. Secondly, the temperature of transition of nanoparticles to the superparamagnetic state (blocking temperature) and the temperature range within which the magnetic structure of the outer shell of the magnetic nanoparticle is in the spin glass state are established Keywords: iron oxide nanoparticles, ferromagnetic resonance, superparamagnetism, blocking temperature.
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D, Sowbhagya. « Superparamagnetic Iron Oxide Nanoparticles [SPION] and its Diversified Applications in the Medical Field : A Mini-Review ». Nanomedicine & ; Nanotechnology Open Access 8, no 3 (2023) : 1–10. http://dx.doi.org/10.23880/nnoa-16000248.

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Late 21st century, extensive research has been carried out on nanoparticles due to their significant role in a supercapacitor, energy storage, sensing, catalysis, green gas production, and photocatalysis due to their semiconductor behavior, costeffective and simple methodology. The utilization of nanoparticle (NP) material provides numerous advantages in biomedical applications due to its unique properties. Superparamagnetic iron oxide nanoparticles (SPIONs) have been recognized in numerous fields including nanobiotechnology, biomedical engineering, and many other fields for their inestimable applications. Superparamagnetic properties and the smaller size of SPIONs are the major reasons for its utilization in various fields. In this study, we focused on different roots to synthesize the ION Super Paramagnetic Iron oxide nanoparticles (SPION), and biomedical applications due to their non-toxic in biological systems.
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Rhee, Ilsu. « Superparamagnetic Transition in Ultrasmall Superparamagnetic Iron Oxide Nanoparticles ». Journal of the Korean Physical Society 54, no 4 (15 avril 2009) : 1721–24. http://dx.doi.org/10.3938/jkps.54.1721.

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Mozayyeni, Neda, Ali Morsali, Mohammad Reza Bozorgmehr et Safar Ali Beyramabadi. « Mechanistic and energetic studies of superparamagnetic iron oxide nanoparticles as a cyclophosphamide anticancer drug nanocarrier : A quantum mechanical approach ». Progress in Reaction Kinetics and Mechanism 44, no 1 (février 2019) : 92–101. http://dx.doi.org/10.1177/1468678319825689.

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Using Fe6(OH)18(H2O)6 as a ring cluster model for superparamagnetic iron oxide nanoparticles, noncovalent configurations and three mechanisms of covalent functionalization of superparamagnetic iron oxide nanoparticles with cyclophosphamide an anticancer drug were studied. Quantum molecular descriptors, solvation, and binding energies of noncovalent interactions were investigated the in gas and solution phases at the B3LYP and M06-2X density functional levels. In the vicinity of superparamagnetic iron oxide nanoparticles, the reactivity of the drug increases, showing cyclophosphamide can probably bind to superparamagnetic iron oxide nanoparticles through Cl ( k1 mechanism), P=O ( k2 mechanism), and NH in a six-membered ring ( k3 mechanism) groups. The activation parameters of all pathways were calculated, indicating the high barriers related to the k1 and k2 mechanisms are higher the barrier related to the k3 mechanism. The k3 mechanism is also spontaneous and exothermic and is therefore the preferred mechanism for covalent functionalization.
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Molina, Miguel M., Amedea B. Seabra, Marcelo G. de Oliveira, Rosangela Itri et Paula S. Haddad. « Nitric oxide donor superparamagnetic iron oxide nanoparticles ». Materials Science and Engineering : C 33, no 2 (mars 2013) : 746–51. http://dx.doi.org/10.1016/j.msec.2012.10.027.

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Thèses sur le sujet "Iron oxide superparamagnetic nanoparticles"

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Sreeja, V. « Synthesis and studies on superparamagnetic iron oxide nanoparticles ». Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2011. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3773.

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Abdollah, M. R. A. « Developing superparamagnetic iron oxide nanoparticles as targeted cancer nanomedicine ». Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1473874/.

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Superparamagnetic Iron Oxide Nanoparticles (SPIONs) have unique properties with potential application in targeted cancer treatment; including the ability to generate heat when placed in an external alternating magnetic field. However, challenges such as rapid circulatory clearance by the reticuloendothelial system (RES), the need for effective functionalisation with cancer-targeting agents and heterogeneity of SPIONs, remain to be overcome. The work in this thesis aims to develop SPIONs by addressing these challenges. Ferucarbotran (Resovist®), a clinically approved MRI contrast SPION with excellent heating potential was investigated. Three main hypotheses were tested; that RES uptake of SPIONs could be blocked in vitro and in vivo, that specific targeting could be achieved by functionalising SPIONs with non-immunoglobulin cancer-targeting proteins and that product heterogeneity could be addressed by physical separation. Studies included: (i) Interactions of SPIONs with different cell types (ii) Blocking cell uptake using polysaccharide derivatives (iii) Conjugation strategies to link SPIONs to near-infrared dyes to trace their blood levels (iv) Enhancing the circulatory retention of SPIONs via RES blocking (v) Site-specific conjugation methods to functionalise SPIONs with cancer targeting protein (vi) Cellular- and immuno-assays to test the binding of functionalised SPIONs to target antigen (vii) Size exclusion chromatography (SEC) to fractionate SPIONs. Results showed that Ferucarbotran was unspecifically internalised by all tested cell lines. A range of sulfated polysaccharides were shown to block this uptake in vitro and in vivo leading to prolonged circulatory times. Ferucarbotran was successfully functionalised with cancer-targeting protein and bound specifically to target antigen in ELISA. Cellular assays with a range of cell lines revealed the generalised altered behaviour of SPIONs upon surface modification with proteins. SEC successfully fractionated Ferucarbotran into more homogeneous products with improved heating properties. In conclusion, these results are consistent with the proposed hypotheses and form a platform for addressing the challenges of SPIONs-based cancer nanomedicine.
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Masoodzadehgan, Nazanin Hoshyar. « Superparamagnetic iron oxide nanoparticles development, characterization, cupper-64 labeling and cellular tracking ». Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43619.

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Development of nanostructures as MR contrast agent will significantly improve the field of disease diagnostics. Contrast agents such as iron oxide nanoparticles are less toxic compared to more commonly used gadolinium based agents. A subclass of iron based nano particles are super paramagnetic iron oxide nano particles, (SPIOs) which are widely studied MR contrast agents useful in both imaging and drug delivery applications. In this work, SPIOs were synthesized and characterized and used for cellular tracking and multi modal labeling. A new solvent exchange method was utilized to coat different core size iron oxide nano particles. SPIOs were characterized for in-vivo imaging using MR and they had a very uniform size distribution which was determine using dynamic light scattering (DLS) and transmission electron microscopy. Furthermore, blood circulation half-life of 16nm SPIOs were determined through tail vein injection. SPIOs have many applications among which is the in vivo tracking of stem cells which is critical for determination of stem cells fate after injection. Magnetic Resonance (MR) as a non-invasive method can provide significant information about the fate of the cells as well as determination of the success rate of therapeutic cellular deliveries. Mesenchymal stem cells can be loaded with super paramagnetic iron oxide nano particles (SPIOs) and have their movements followed once planted in vivo. We present our findings on the effect of SPIO concentration and stem cell density on the MR signal and transverse relaxation time. Our preliminary results indicated that SPIOs do not cause mesenchymal stem cell cytotoxicity and do not affect proliferation ability up to 200 μg/ml concentration. The release of the nanoparticles was investigated 24 hours post internalization and the result showed that SPIOs will stay inside the cell. We also found that the contrast increases in a concentration dependent manner. Our results suggest that using MR with low concentration of SPIOs is a novel and promising method for tracking of mesenchymal stem cells. In this work SPIOs were also labeled with 64Cu to investigate their potential for multi modal positron emission tomography (PET) MR imaging. Dual modality PET MR SPIO contrast agent can be synthesized to image diseases such as cancer and atherosclerosis. The advantage is the non-invasive and early detection of disease at molecular lever before it has spread to late stages or in case of the atherosclerosis before the plaque has blocked the vessel. To develop a multi modal contrast agent, a positron emitter, 64Cu (half-life of 12.701 ± 0.002 hours), was used in labeling and synthesis was performed all in one step with the addition of 64Cu chelator, 14-PE DTPA followed by radiolabeling for both 6.5nm SPIO and 17nm SPIO. After labeling and purification with the desalting column, the amount of dissociated 64Cu in the solution was determined using radio thin layer chromotagraphy (TLC) and the particle was shown to have minimum amount of fee 64Cu. Serum stability of labeled SPIO was determined in vitro by incubating 64Cu-labeled SPIOs in mouse serum at 37 °C for 24 hr with constant shaking. Radio TLC result then revealed that 64Cu stays bounded to the SPIO after 24 hours in mouse serum. This means that 64Cu labeled SPIO has a great potential as a dual modality contrast agents and further in-vivo studies are required to verify the findings.
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Majid, Abdul. « Thermally responsive peptide coated superparamagnetic iron oxide nanoparticles for drug delivery ». Thesis, University of Central Lancashire, 2017. http://clok.uclan.ac.uk/20743/.

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Target specific delivery of anticancer drugs to the effected site without showing systematic toxicity to normal tissues is important. Multifunctional biodegradable delivery systems reduce systematic toxicity in an efficient manner. These drug carriers should provide controlled release, be directed towards desired site, track payloads via contrast imaging, heat the effected sites and trigger drug release. In this context, superparamagnetic iron oxide nanoparticles based drug delivery systems are highly desirable. Superparamagnetic iron oxide nanoparticles upon exposure of alternate magnetic field could be directed and provide heat to localised areas. Moreover, superparamagnetic iron oxide nanoparticles also have image contrast ability for magnetic resonance imaging. This study aimed to develop biocompatible superparamagnetic iron oxide nanoparticles. These nanoparticles were coated by bioinspired materials such as peptides (diphenylalanine) to achieve monodispersed dual efficient such as drug carriers and hyperthermia. Thermally responsive core-shell materials with tubular and spherical morphologies without compromising the inner cores properties such as superparamagnetism is highly desirable. Two shapes of iron oxide (spherical and tubular) were prepared using co-precipitation of iron (II) and (III) ion and oxidative hydrolysis of ferrous sulphate in alkaline solutions, respectively. Spherical peptide shells were synthesised using tert-Butyloxycarbonyl modified diphenylalanine peptide in ethanol-water (1:1) mixture. Tubular peptide shells were prepared using similar diphenylalanine non-modified peptide. The iron oxide nanoparticles (spherical and tubular) were encapsulated via template-mediated synthesis using ultra-sonication and vortex-mixing methods. These materials were characterised using variety of techniques such as, zetasizer, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDAX), Fourier Transform Infrared Spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) analysis, Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Vibrating Sample Magnetometer (VSM) and magnetic field induced hyperthermia. The diameter of spherical superparamagnetic iron oxide nanoparticles were measured to be ranges from 10 to 35 nm and rod-shaped core materials showed nearly 10 nm width and several hundred nanometres in length. Spherical peptide were approximately 1 µm in diameter. Tubular-shaped peptide were between 100-300 nm in width and several micrometres in length. These peptides were used as shells for the preparation of core-shell composites. Both spherical and rod-shaped core-shell composites were similar in dimensions to the pure peptide particles. Observational analysis confirmed the presence core-shell composition. Spherical iron oxide core materials were crystalline magnetite (Fe3O4) structures confirmed by powder XRD. These magnetite nanocrystals were further modified with a biocompatible silica shell. Brunauer–Emmett–Teller (BET) analysis revealed a mesoporous shell structure. Spherical peptide shells were found to be amorphous and tubular peptide shells were crystalline in nature. VSM of core-shell composite materials depicted superparamagnetic nature, hence these materials have ability to heat over the exposure of applied external magnetic field for hyperthermia ablation. Anticancer drug (doxorubicin, DOX) loading and release profile of bare spherical and rod-shaped iron oxide nanoparticle and peptide, silica and peptide-capped silica coated spheres were studied for potential therapeutic application. The doxorubicin loading efficiency was observed to be ranging from 12 % to 90 % depending on the type materials. The in vitro drug release profiles were measured at 37 °C without the exposure of magnetic field in incubation and with applied magnetic field. Time-dependent studies showed sustained release of DOX in silica coated and peptide- capped silica coated spherical superparamagnetic iron oxide nanoparticles were ranging from 0 to 30 % over 72 hours of incubation. Concentration dependent studies revealed that the ratio of 1:100 (doxorubicin:superparamagnetic iron oxide nanoparticles) had the maximum loading efficiency with minimum release capability. Exposure to Alternate Current (AC) magnetic field (200 G; 406 kHz) the spherical materials generated hyperthermia in a time dependent manner reaching 50 °C in 3 minutes. Tubular peptide coated iron oxide materials did not induce heat even after 25 minutes of exposure indicating weak superparamagnetism. Magnetic field triggered drug release was seen only in spherical core-shell nanocomposites with 6X higher compared at 37 °C without exposure.
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Marinin, Aleksandr. « Synthesis and characterization of superparamagnetic iron oxide nanoparticles coated with silica ». Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-121520.

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Multifunctional superparamagnetic iron oxide nanoparticles (SPIONs) coated with silica are a promising research field for lots of biomedical applications. The scope of this work is a preparation of SPIONs and coating them with silica to form core-shell structured nanoparticles for nanomedicine applications. SPIONs were synthesized by two chemical methods – co-precipitation and thermal decomposition of organic iron precursor. Prepared nanoparticles were carefully characterized –average size, size distribution, morphology, crystallinity, colloidal stability and magnetic properties were studied. After comparing SPIONs synthetized by two routes the most suitable method for biomedical applicable nanoparticles preparation is determined. The nanomedicine requires nanoparticles of the highest quality. The next step was coating SPIONs with silica shell. For this purpose inverse microemulsion method was chosen. TEOS was used as a silica precursor. Mean size, size distribution, magnetic properties, structure of silica shell were studied.
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Carrara, C. « SUPERPARAMAGNETIC IRON OXIDE NANOPARTICLES (SPIONS) : DESIGN AND SYNTHESIS OF NEW NANOCONJUGATES ». Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/214973.

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Superparamagnetic Iron Oxide Nanoparticles (SPIONs) have demonstrated great promise for diagnostic and therapeutic applications. Thanks to their magnetic properties and to their size, comparable to that of biologically objects, they are very useful for biomedical applications, such as, for example, automated DNA extraction, targeted gene delivery, magnetic resonance imaging (MRI), and magnetic field induced hyperthermia for cancer therapy.For these applications, SPIONs must be coupled with targeting agents, therapeutic drugs, and other functional probes. Hence, the need to develop efficient synthetic strategies for the conjugation of molecules to SPIONs is an important and appealing target. The strategies used can involve passive noncovalent adsorption on the outer particle surface or the formation of a more stable covalent bond by using appropriate heterobifunctional linkers, in which one functional group specifically binds the nanoparticle, while the other reacts with the biomolecule in order to form the new nanoconjugate. In this thesis, the use of an heterobifunctional linkers containing an isocyanate moiety as new functional group able to directly bind SPIONs will be shown. We were able to demonstrate that the NCO moiety is able to directly reacts with the surface hydroxyl groups exposed on the outer nanoparticles surface leading to a covalent carbamate-like bond. Comparison with classical non-covalent and covalent anchoring methodologies were also performed. To further confirm the possible application of this new anchoring methodology, new SPION-PNA (Peptide Nucleic Acid, mimics of natural oligonucleotides) nanoconjugates were synthesized and their binding affinity towards complementary DNAs were evalueted.
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Chin, Suk Fun. « Superparamagnetic nanoparticles for biomedical applications ». University of Western Australia. School of Biomedical, Biomolecular and Chemical Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0128.

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[Truncated abstract] In the past decade, the synthesis of superparamagnetic iron oxide nanoparticles (SPIONs) has received considerable attention due to their potential applications in biomedical fields. However, success in size and shape control of the SPIONs has been mostly achieved through organic routes using large quantities of toxic or/and expensive precursors in organic reaction medium at high reaction temperature. This has limited the biomedical applications of SPIONs and therefore, development of a synthetic method under aqueous condition that is reproducible, scalable, environmentally benign, and economically feasible for industrial production is of paramount importance in order to fully realise their practical applications. Spinning Disc Processing (SDP) has been used to synthesise superparamagnetic magnetite (Fe3O4) nanoparticles at room temperature via a modified chemical precipitation method under continuous flow condition and offer a potential alternative to be applied to SPIONs production. SDP has extremely rapid mixing under plug flow conditions, effective heat and mass transfer, allowing high throughput with low wastage solvent efficiency. The synthesis process involves passing ammonia gas over a thin aqueous film of Fe2+/3+ which is introduced through a jet feed close to the centre of a rapidly rotating disc (500-2500 rpm). Synthetic parameters such as precursor concentrations, temperature, flow rate, disc speed, and surface texture influence the particle sizes. ... Magnetic silica microspheres are receiving great attention for possible applications in magnetic targeting drug delivery, bioseparation and enzyme isolation. However, the current available methods for preparation suffer from the setback of low loading of Fe3O4 nanoparticles in the silica microsphere, which result in low magnetic moment, thereby limiting their practical applications. Therefore it is of considerable importance to develop new alternative synthetic methods for fabricating magnetic silica microspheres with high magnetic nanoparticles loading. Superparamagentic Fe3O4 nanoparticles (8-10 nm diameter) and curcumin have been encapsulated in mesoporous silica in a simple multiplestep self assembly approach process with high Fe3O4 nanoparticles loading (37%). The synthesis involves loading of curcumin in the Cetyltrimethylammonium bromide (CTAB) micellar rod in the presence of superparamagnetic Fe3O4 nanoparticles via a parallel synergistic approach. The synthesised magnetic mesoporous silica composite material is stable, superparamagnetic with high saturation magnetisation before and after curcumin leaching experiment. Under physiological pH in phosphate buffer, the curcumin is slowly released over several days. These magnetic mesoporous silica are expected to have great potential as targeted drug delivery systems.
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Sotto, David C. « Directing the migration of mesenchymal stem cells with superparamagnetic iron oxide nanoparticles ». Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54897.

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Cell migration plays an important role in numerous normal and pathological processes. The physical mechanisms of adhesion, protrusion/extension, contractions, and polarization can regulate cell migration speed, persistence time, and downstream effects in paracrine and endocrine signaling. Methods for understanding these biophysical and biochemical responses to date have been limited to the use of external forces acting on mechanotransductive receptors. Additionally, as the use of magnetic nanoparticles for cell tracking and cell manipulation studies continues to gain popularity, so does the importance of understanding the cellular response to mechanical forces caused by these magnetic systems. This thesis work utilizes superparamagnetic iron oxide nanoparticles and static magnets to induce an endogenous magnetic force on the cell membrane. This cell manipulation model is used to better understand the mechanobiological responses of mesenchymal stem cell to SPIO labeling and endogenous force generation. Directionally persistent motility, cytoskeletal reorganization, and altered pro-migratory cytokine secretion is reported in this thesis as a response to SPIO based cell manipulation.
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Angelopoulos, I. « Magnetic actuation of smooth muscle cells loaded with superparamagnetic iron oxide nanoparticles ». Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1461225/.

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Faecal incontinence (FI) is a debilitating disorder that affects a significant portion of the population. The research included in this thesis aimed to test the hypothesis that magnetic actuating of smooth muscle cells loaded with superparamagnetic iron oxide nanoparticles (SPION) can modify the cell phenotype, which could be used with as a future therapy. The research focused on exploring a novel method of magnetic actuation and assessing its effects on the phenotype and biocompatibility of human rectal smooth muscle cells (HRSMC). A 2D model was used to demonstrate the effects of SPION on HRSMC. Initially, the effect of incubating HRSMC with different concentrations of SPION (0, 31.25, 250 and 1000 μg/ml) for 24 hours was investigated. Transmission electron microscopy revealed that SPION were endocytosed by cells and became concentrated inside endosomes. Superconducting quantum interference device (SQUID) measurements showed that SPION loading was concentration dependent and also that saturation occurred for concentrations above 250 μg/ml. SPION loading of HRSMC led to inhibition of the gene expression of actin and calponin when incubated in differentiation medium, with or without magnetic actuation, suggesting SPION caused the cells to shift towards a more proliferative phenotype. Live cell imaging revealed actuation of SPION-loaded HRSMC with stronger magnets led to an observable movement of internalized SPION and the plasma membrane. The findings from this research indicate SPION is biocompatible and may alter the phenotype of HRSMC. Therefore, SPION may offer novel benefits for regenerating damaged muscle in the treatment of FI. Further investigation is needed to assess the effects of magnetic actuation on SPION loaded cells.
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Peacock, A. K. « Surface modified superparamagnetic iron oxide nanoparticles for long term stem cell tracking ». Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3000750/.

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In the initial stages of this project, the aim was to develop polymer coated superparamagnetic iron oxide nanoparticles (SPIONs) which would be stable in physiological buffer solutions at 37 °C (body temperature) for cell labelling experiments. Well-defined end functional hydrophilic poly(2-methacryloyloxyethyl phosphorylcholine) (pMPC) homopolymers were prepared by atom transfer radical polymerisation (ATRP) and used to couple onto the surface of functionalised SPIONs using an end grafting-to approach. pMPC was chosen due to its well-known biocompatibility. The pMPC coated SPIONs were investigated as a potential T2 magnetic resonance image (MRI) contrast agent through biocompatibility and colloidal stability screening prior to biological studies of the polymer coated SPIONs with stem cells. In the later stages of this project, silica and gold nanoparticle (NP) surface coatings were individually investigated for their chemical stability and protection of the SPION core to acidic conditions mimicking those found in the lysosome of the stem cell. This was carried out in order to develop and screen a coating that would enable long term stem cell tracking. Again, the nanomaterials prepared were assessed for biocompatibility and their magnetic properties were measured prior to stem cell labelling studies. In the final chapter, the nanomaterials prepared throughout this Thesis were subjected to stem cell labelling and the retention of the nanomaterials inside stem cells was investigated.
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Livres sur le sujet "Iron oxide superparamagnetic nanoparticles"

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Mahmoudi, Morteza. Superparamagnetic iron oxide nanoparticles : Synthesis, surface engineering, cytotoxicity, and biomedical applications. New York : Nova Science Publishers, 2011.

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Wigger, Henning. Environmental Release of and Exposure to Iron Oxide and Silver Nanoparticles. Wiesbaden : Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-16791-2.

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Huang, Xiao-Lan. Iron Oxide Nanoparticles. IntechOpen, 2022.

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Iron Oxide Nanoparticles [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.95129.

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Iron Oxide Nanoparticles for Biomedical Applications. Elsevier, 2018. http://dx.doi.org/10.1016/c2015-0-06003-8.

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Villegas, Patricia. Iron Oxide Nanoparticles and Their Applications. Nova Science Publishers, Incorporated, 2021.

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Villegas, Patricia. Iron Oxide Nanoparticles and Their Applications. Nova Science Publishers, Incorporated, 2021.

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Toxicity studies of polymer based superparagnetic iron oxide nanoparticles. España : Prensas de la Universidad de Zaragoza, 2015.

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Urtizberea, Ainhoa. Open problems in the magnetic behavior of iron-oxide nanoparticles. Prensas Universitarias de la Universidad de Zaragoza, 2011. http://dx.doi.org/10.26754/uz.978-84-15274-76-6.

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Laurent, Sophie, Ghenadii Korotcenkov et Morteza Mahmoudi. Iron Oxide Nanoparticles for Biomedical Applications : Synthesis, Functionalization and Application. Elsevier Science & Technology Books, 2017.

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Chapitres de livres sur le sujet "Iron oxide superparamagnetic nanoparticles"

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Laurent, Sophie, Céline Henoumont, Dimitri Stanicki, Sébastien Boutry, Estelle Lipani, Sarah Belaid, Robert N. Muller et Luce Vander Elst. « Superparamagnetic Iron Oxide Nanoparticles ». Dans MRI Contrast Agents, 55–109. Singapore : Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2529-7_5.

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Laurent, Sophie, Luce Vander Elst et Robert N. Muller. « Superparamagnetic Iron Oxide Nanoparticles for MRI ». Dans The Chemistry of Contrast Agents in Medical Magnetic Resonance Imaging, 427–47. Chichester, UK : John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118503652.ch10.

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Maity, Dipak, Ganeshlenin Kandasamy et Atul Sudame. « Superparamagnetic Iron Oxide Nanoparticles for Cancer Theranostic Applications ». Dans Nanotheranostics, 245–76. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29768-8_12.

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Patil-Sen, Yogita, et Vikesh Chhabria. « Superparamagnetic Iron Oxide Nanoparticles for Magnetic Hyperthermia Applications ». Dans NanoBioMaterials, 247–62. Boca Raton : Taylor & Francis, 2018. : CRC Press, 2018. http://dx.doi.org/10.1201/9781351138666-13.

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Savari, Mohammad-Nabil, et Ali Jabali. « Superparamagnetic Iron Oxide Nanoparticle (SPION) Synthesis ». Dans Nanomedicine and Nanotoxicology, 35–47. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-6507-6_3.

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El-Sherbiny, Ibrahim M., Mousa El-Sayed et Asmaa Reda. « Superparamagnetic Iron Oxide Nanoparticles (SPIONs) as Multifunctional Cancer Theranostics ». Dans Magnetic Nanoheterostructures, 223–41. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39923-8_6.

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Eustaquio, Trisha, et James F. Leary. « Single-Cell Nanotoxicity Assays of Superparamagnetic Iron Oxide Nanoparticles ». Dans Methods in Molecular Biology, 69–85. Totowa, NJ : Humana Press, 2012. http://dx.doi.org/10.1007/978-1-62703-002-1_5.

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Cano, L. A., M. V. Cagnoli, S. J. Stewart, E. D. Cabanillas, E. L. Romero et S. G. Marchetti. « Synthesis and characterization of superparamagnetic iron oxide nanoparticles for biomedical applications ». Dans LACAME 2008, 275–80. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-10764-1_41.

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Zhu, Wencheng, Ye Xu, Rongrong Jin, Changqiang Wu et Hua Ai. « MRI Tracking of Dendritic Cells Loaded with Superparamagnetic Iron Oxide Nanoparticles ». Dans Cell Tracking, 107–16. New York, NY : Springer US, 2020. http://dx.doi.org/10.1007/978-1-0716-0364-2_10.

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Djekic, Ljiljana. « Superparamagnetic Iron Oxide Nanoparticles : Application In Diagnosis and Therapy of Cancer ». Dans Nanoparticulate Drug Delivery Systems, 281–312. Toronto ; New Jersey : Apple Academic Press, 2019. : Apple Academic Press, 2019. http://dx.doi.org/10.1201/9781351137263-8.

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Actes de conférences sur le sujet "Iron oxide superparamagnetic nanoparticles"

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Buyukhatipoglu, Kivilcim, Tiffany A. Miller et Alisa Morss Clyne. « Biocompatible, Superparamagnetic, Flame Synthesized Iron Oxide Nanoparticles : Cellular Uptake and Toxicity Studies ». Dans ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68049.

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Superparamagnetic iron oxide nanoparticles, including magnetite (Fe3O4), are widely used in applications such as targeted drug delivery, magnetic resonance imaging, tissue engineering, gene therapy, hyperthermic malignant cell treatment, and cell membrane manipulation. These nanoparticles are particularly interesting for in vivo and in vitro applications since they do not exhibit magnetic behavior once the magnetic field has been removed. In the current work, superparamagnetic iron oxide nanoparticles were produced using a flame synthesis method, which provides significant advantages over other material synthesis processes such as solgel processing, chemical vapor deposition, and laser ablation. Flame synthesis allows control of particle size, size distribution, phase and composition by altering flame operating conditions. Flame synthesis is further capable of commercial production rates with minimal post-processing of the final product materials. This study focuses on the interaction of flame synthesized iron oxide nanoparticles with porcine aortic endothelial cells and compares the results to those obtained using commercially available iron oxide nanoparticles. The materials characteristics of the flame synthesized iron oxide nanoparticles, including morphology, elemental composition, particle size, were analyzed by electron microscopy (TEM, ESEM, EDS), and Raman Spectroscopy. The data verified production of a heterogenous mixture of hematite and magnetite nanoparticles, which exhibit superparamagnetic properties. Monodisperse iron oxide particles of 6–12 nm diameter and aggregated clusters of these 6–12nm nanoparticles have been synthesized. Nanoparticle biocompatibility was assessed by incubating flame synthesized and commercially available iron oxide nanoparticles with endothelial cells for 24 hours. Both alamar blue and Live/Dead cell assays showed no significant toxicity difference between flame synthesized and commercially available nanoparticles. Cells exposed to both types of nanoparticles maintained membrane integrity, as indicated by minimal lactase dehydrogenase release. Endothelial cells imaged by ESEM and confirmed by EDS demonstrated that uncoated flame synthesized nanoparticles are ingested into cells in a similar manner to commercially available nanoparticles. These data suggest that flame synthesized iron oxide nanoparticles are comparable to commercially available nanoparticles for biological applications. Flame synthesis has the advantage of a relatively simple synthesis process with higher purity products and lower time and energy manufacturing costs. Future work will include functionalizing the nanoparticle surfaces for specific biological applications, including specific cell targeting and bioactive factor delivery.
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LÜDTKE-BUZUG, KERSTIN, SVEN BIEDERER, MARLITT ERBE, TOBIAS KNOPP, TIMO F. SATTEL et THORSTEN M. BUZUG. « SUPERPARAMAGNETIC IRON OXIDE NANOPARTICLES FOR MAGNETIC PARTICLE IMAGING ». Dans Proceedings of the First International Workshop on Magnetic Particle Imaging. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814324687_0006.

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Garg, Vijayendra K., Erno Kuzmann, Virender K. Sharma, Arun Kumar et Aderbal C. Oliveira. « Superparamagnetic iron oxide nanoparticles (SPIONs) for targeted drug delivery ». Dans MÖSSBAUER SPECTROSCOPY IN MATERIALS SCIENCE 2016. Author(s), 2016. http://dx.doi.org/10.1063/1.4966005.

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Welzel, T., C. Debbeler, M. Graeser, S. Kaufmann, R. Kusche et K. Ludtke-Buzug. « Analyzing superparamagnetic iron oxide nanoparticles (spions) using electrical impedance spectroscopy ». Dans 2015 5th International Workshop on Magnetic Particle Imaging (IWMPI). IEEE, 2015. http://dx.doi.org/10.1109/iwmpi.2015.7107062.

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Taratula, Oleh, Ronak Savla, Ipsit Pandya, Andrew Wang, Tamara Minko et Huixin He. « Novel Superparamagnetic Iron Oxide Nanoparticles for a Multifunctional Nanomedicine Platform ». Dans 2008 MRS Fall Meetin. Materials Research Society, 2008. http://dx.doi.org/10.1557/proc-1140-hh05-11.

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Woo, K., et J. Hong. « Surface modification of superparamagnetic iron oxide nanoparticles for clinical applications ». Dans INTERMAG Asia 2005 : Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1463828.

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Holst, Maria, Magnus Cinthio, Sarah Fredriksson, Fredrik Olsson, Hans W. Persson et Tomas Jansson. « Phase-locked magnetomotive ultrasound imaging of superparamagnetic iron-oxide nanoparticles ». Dans 2010 International Ultrasonics Symposium. IEEE, 2010. http://dx.doi.org/10.1109/ultsym.2010.5935431.

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Bienzeisler, Jonas, Kerstin Ludtke-Buzug et Jorg Schemberg. « Magnetic flow field separation of superparamagnetic dextran coated iron oxide nanoparticles ». Dans 2015 5th International Workshop on Magnetic Particle Imaging (IWMPI). IEEE, 2015. http://dx.doi.org/10.1109/iwmpi.2015.7107063.

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Bárcena, Carlos, Chalermchai Khemtong, Girija S. Chaubey, Chase W. Kessinger, J. Ping Liu et Jinming Gao. « Zinc Superparamagnetic Iron Oxide Nanoparticles for Use as MRI Contrast Agents ». Dans ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176240.

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Molecular imaging has become a rapidly evolving field used in various applications to target macromolecules and biological process [1,2]. Various imaging systems, such as single photon emission computed tomography (SPECT), positron emission tomography (PET), computerized tomography (CT), and magnetic resonance imaging (MRI), use non-invasive techniques that provide disease-specific information through diagnostic imaging. Early detection of disease demonstrates the potential benefit of these systems.
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Idée, Jean-Marc, et Elisabetta Borsella. « Ultrasmall Superparamagnetic Particles Of Iron Oxide : Where We Are, Where We Want To Go ». Dans BONSAI PROJECT SYMPOSIUM : BREAKTHROUGHS IN NANOPARTICLES FOR BIO-IMAGING. AIP, 2010. http://dx.doi.org/10.1063/1.3505062.

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Rapports d'organisations sur le sujet "Iron oxide superparamagnetic nanoparticles"

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Mohar, Jacob Steven, Ekaterina Dolgopolova et Jennifer Ann Hollingsworth. Size and Shape Control of Gallium-Iron Oxide Nanoparticles. Office of Scientific and Technical Information (OSTI), juillet 2019. http://dx.doi.org/10.2172/1545738.

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Attias, Andre-Jean, Kwang-Sup Lee et Alex K. Jen. Coupling Graphene Sheets with Iron Oxide Nanoparticles for Energy Storage and Microelectronics. Fort Belvoir, VA : Defense Technical Information Center, août 2015. http://dx.doi.org/10.21236/ada636883.

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Dixon, David Adams. Final Report : The Impact of Carbonate on Surface Protonation, Electron Transfer and Crystallization Reactions in Iron Oxide Nanoparticles and Colloids. Office of Scientific and Technical Information (OSTI), juillet 2013. http://dx.doi.org/10.2172/1086712.

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