Relevant bibliographies by topics / Spheroid

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Spheroid'

Author: Grafiati
Published: 4 June 2021
Last updated: 22 February 2025

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Journal articles on the topic "Spheroid"

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LIN, SUNG-JAN, WEN-CHU HSIAO, CHIH-JUNG HSU, JAU-SHIUH CHEN, SHIOU-HWA JEE, TSEN-FANG TSAI, HSIN-SU YU, and TAI-HORNG YOUNG. "THE EFFECT OF SERUM CONCENTRATION ON THE SPHEROID FORMING ACTIVITY AND CELL GROWTH OF HUMAN MELANOCYTES ON CHITOSAN SURFACE." Biomedical Engineering: Applications, Basis and Communications 18, no. 01 (February 25, 2006): 42–46. http://dx.doi.org/10.4015/s1016237206000099.

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We have developed a chitosan-based melanocyte patch to improve the drawbacks encountered in autologous melanocyte transplantation for vitiligo treatment by use of melanocyte suspension. Melanocytes spontaneously grow into three dimensional spheroids on chitosan-coated surface and melanocyte spheroids show a better survival in growth factor and serum-deprived condition. Hence, preculturing melanocytes into spheroids on chitosan surface can provide melanocytes a survival advantage in stringent conditions. Up to date, the mechanism of the melanocyte spheroid formation is not clear. It has been shown that certain factors in serum are crucial for multicellular spheroid formation in cancer cell lines. In this work, we investigate the effect of serum concentration on the melanocyte spheroid formation. The trend for melanocyte spheroid formation is gradually decreased when serum concentration is serially increased from 0% to 20%. Our result shows that melanocyte spheroid formation is not inhibited in the absence of serum and serum deprivation accelerates melanocyte spheroid formation. However, melanocyte growth is greatly reduced when serum is completely removed. Our results suggest that melanocyte spheroid formation on chitosan is not dependent on serum factors. However, the presence of serum contributes to the cell growth on chitosan-coated surface. This result is important in the future development of serum free culture system for spheroidal melanocyte patch.
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Smith, J. Torquil, and H. Frank Morrison. "Approximating spheroid inductive responses using spheres." GEOPHYSICS 71, no. 2 (March 2006): G21—G25. http://dx.doi.org/10.1190/1.2187738.

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Spheroid responses are important as limiting cases when modeling inductive responses of isolated metallic objects such as unexploded military ordnance. The response of high-permeability ([Formula: see text] ≥ 50) conductive spheroids of moderate aspect ratios (0.25–4) to excitation by uniform magnetic fields in the axial or transverse direction is approximated by the response of spheres of appropriate diameters, of the same conductivity and permeability, with magnitude rescaled based on the differing volumes, dc magnetizations, and high-frequency limit responses of the spheres and modelled spheroids. In the frequency domain, the scaled sphere responses agree within 5% of complex magnitudes for prolate spheroids and within 7% for oblate spheroids. The approximation is more accurate for source magnetic fields in the spheroid's shorter direction than in the spheroid's longer direction. In the time domain, the approximation describes spheroid responses over five decades of time after transmitter shutoff, with a maximum discrepancy of 20%.
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Saad, E. I. "Translation and rotation of a porous spheroid in a spheroidal container." Canadian Journal of Physics 88, no. 9 (September 2010): 689–700. http://dx.doi.org/10.1139/p10-040.

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The flow problem of an incompressible axisymmetrical quasisteady translation and steady rotation of a porous spheroid in a concentric spheroidal container are studied analytically. The same small departure from a sphere is considered for each spheroidal surface. In the limit of small Reynolds number, the Brinkman equation for the flow inside the porous region and the Stokes equation for the outside region in their stream functions formulations and velocity components, which are proportional to the translational and angular velocities, respectively, are used. Explicit expressions are obtained for both inside and outside flow fields to the first order in a small parameter characterizing the deformation of the spheroidal surface from the spherical shape. The hydrodynamic drag force and couple exerted on the porous spheroid are obtained for the special cases of prolate and oblate spheroids in closed forms. The dependence of the normalized wall-corrected translational and rotational mobilities on permeability for a porous spheroid in an unbounded medium and for a solid spheroid in a cell on the particle volume fraction is discussed numerically and graphically for various values of the deformation parameter. In the limiting cases, the analytical solutions describing the drag force and torque or mobilities for a porous spheroid in the spheroidal vessel reduce to those for a solid sphere and for a porous sphere in a spherical cell.
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Iyengar, T., and T. Radhika. "Stokes flow of an incompressible micropolar fluid past a porous spheroidal shell." Bulletin of the Polish Academy of Sciences: Technical Sciences 59, no. 1 (March 1, 2011): 63–74. http://dx.doi.org/10.2478/v10175-011-0010-5.

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Stokes flow of an incompressible micropolar fluid past a porous spheroidal shellConsider a pair of confocal prolate spheroids S0and S1where S0is within S1. Let the spheroid S0be a solid and the annular region between S0and S1be porous. The present investigation deals with a flow of an incompressible micropolar fluid past S1with a uniform stream at infinity along the common axis of symmetry of the spheroids. The flow outside the spheroid S1is assumed to follow the linearized version of Eringen's micropolar fluid flow equations and the flow within the porous region is assumed to be governed by the classical Darcy's law. The fluid flow variables within the porous and free regions are determined in terms of Legendre functions, prolate spheroidal radial and angular wave functions and a formula for the drag on the spheroid is obtained. Numerical work is undertaken to study the variation of the drag with respect to the geometric parameter, material parameter and the permeability parameter of the porous region. An interesting feature of the investigation deals with the presentation of the streamline pattern.
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Bridges, Michael A., David C. Walker, Robert A. Harris, Bruce R. Wilson, and A. George F. Davidson. "Cultured human nasal epithelial multicellular spheroids: polar cyst-like model tissues." Biochemistry and Cell Biology 69, no. 2-3 (February 1, 1991): 102–8. http://dx.doi.org/10.1139/o91-016.

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We report here a new readily cultured nonadherent hollow spheroidal epithelial tissue model: human nasal epithelial multicellular spheroids, prepared from brushings of human nasal epithelium in vivo. Although cultured cyst-like epithelial models developed from embryonic, transformed, or polypoid tissues have been reported previously, human nasal epithelial multicellular spheroids are derived from normal mature nontransformed human airway epithelial cells. In our studies, spheroids ranged in size from 50 to 700 μm diameter (averaging approximately 250 μm). Cells of the spheroid displayed morphological polarity and formed junctional complexes. Transcellular electrolyte transport may underlie the increase in spheroid size which occurred in culture. The ease and simplicity of the brushing and culture procedures reported here render normal and diseased human cell populations more readily accessible to investigation. We believe human nasal epithelial multicellular spheroids may have important applications in the study of electrolyte and fluid transport processes, ciliary motility, epithelial polarity, cellular metabolism, and drug cytotoxicity in normal and pathophysiological states of the human respiratory tract (e.g., cystic fibrosis).Key words: cultured airway epithelial cells, electrolyte and fluid transport, spheroid, cyst, cystic fibrosis.
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Nurhazirah Mohamad Yunos, Taufiq Khairi Ahmad Khairuddin, Nor Muhainiah Mohd Ali, and Suzarina Ahmed Sukri. "Spheroidal First Order Polarization Tensor (SFOPT) Toolkit." Semarak International Journal of Fundamental and Applied Mathematics 1, no. 1 (April 3, 2024): 24–37. http://dx.doi.org/10.37934/sijfam.1.1.2437.

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The polarization tensor (PT) has been utilized in numerous applications involving electric and electromagnetic fields, such as metal detection, landmine detection, and electrical imaging. In these applications, the PT is implemented in the process of identifying object, where the object can be represented in the form of the first order PT. Thus, it is crucial to have an application that provides easy access to calculate the first order PT for the object. However, the existing application in the literature has some limitations, focusing solely on computing the first order PT for a prolate spheroid with semi axes and an oblate spheroid with semi axes . Therefore, the purpose of this study is to invent a graphical user interface (GUI) for the Spheroidal First Order Polarization Tensor (SFOPT) Toolkit which facilitates efficient computations and visualizations related to spheroids. The SFOPT Toolkit will be developed by using App Designer in MATLAB. The SFOPT interface integrates four essential functions: computation of the first order PT for a spheroid, classification of spheroidal types, three-dimensional visualization of spheroids, and determination of semi axes from the computed first order PT. Through illustrative examples, we demonstrate the effectiveness and versatility of the SFOPT framework, offering insights into its practical utility and potential applications in diverse fields. The reliability of the toolkit is also presented, and the findings shows the error of computations are small. The toolkit is a user-friendly application since the users can easily access it by downloading the application instead of running the coding themselves. Moreover, this toolkit can be a reference for researchers to compute the first order PT for a spheroid and determine the semi axes (size) of the spheroid from the given first order PT.
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Cesarz, Zoe, and Kenichi Tamama. "Spheroid Culture of Mesenchymal Stem Cells." Stem Cells International 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/9176357.

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Compared with traditional 2D adherent cell culture, 3D spheroidal cell aggregates, or spheroids, are regarded as more physiological, and this technique has been exploited in the field of oncology, stem cell biology, and tissue engineering. Mesenchymal stem cells (MSCs) cultured in spheroids have enhanced anti-inflammatory, angiogenic, and tissue reparative/regenerative effects with improved cell survival after transplantation. Cytoskeletal reorganization and drastic changes in cell morphology in MSC spheroids indicate a major difference in mechanophysical properties compared with 2D culture. Enhanced multidifferentiation potential, upregulated expression of pluripotency marker genes, and delayed replicative senescence indicate enhanced stemness in MSC spheroids. Furthermore, spheroid formation causes drastic changes in the gene expression profile of MSC in microarray analyses. In spite of these significant changes, underlying molecular mechanisms and signaling pathways triggering and sustaining these changes are largely unknown.
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Okumura, Tsuyoshi, Toshikazu Masuya, Yoshimi Takao, and Kouichi Sawada. "Acoustic scattering by an arbitrarily shaped body: an application of the boundary-element method." ICES Journal of Marine Science 60, no. 3 (January 1, 2003): 563–70. http://dx.doi.org/10.1016/s1054-3139(03)00060-2.

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Abstract The boundary-element method (BEM) is applied to calculate target strength (TS) and extinction cross-section of a scatterer. The scattering amplitudes of four types of prolate spheroid, namely, the vacant, rigid, liquid-filled, and gas-filled, are calculated using the BEM. Comparison between the results of the BEM and the prolate-spheroid model (PSM), which is a numerical calculation using spheroidal-wave functions, shows excellent agreement for the vacant, rigid, and liquid-filled spheroids. The TS of a gas-filled prolate spheroid, calculated by the BEM, shows resonance at a low frequency. The lowest resonant frequency, the peak ratio, and the quality factor (Q) of this resonance are compared with those given by the T-matrix and an analytical solution. Again the results show excellent agreement.
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Jang, JunHwee, and Eun-Jung Lee. "Rapid Formation of Stem Cell Spheroids Using Two-Dimensional MXene Particles." Processes 9, no. 6 (May 28, 2021): 957. http://dx.doi.org/10.3390/pr9060957.

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Cell spheroids have been studied as a biomimic medicine for tissue healing using cell sources. Rapid cell spheroid production increases cell survival and activity as well as the efficiency of mass production by reducing processing time. In this study, two-dimensional MXene (Ti3C2) particles were used to form mesenchymal stem cell spheroids, and the optimal MXene concentration, spheroid-production times, and bioactivity levels of spheroid cells during this process were assessed. A MXene concentration range of 1 to 10 μg/mL induced spheroid formation within 6 h. The MXene-induced spheroids exhibited osteogenic-differentiation behavior, with the highest activity levels at a concentration of 5 μg/mL. We report a novel and effective method for the rapid formation of stem cell spheroids using MXene.
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Park, In-Su, Phil-Sang Chung, and Jin Chul Ahn. "Angiogenic Synergistic Effect of Adipose-Derived Stromal Cell Spheroids with Low-Level Light Therapy in a Model of Acute Skin Flap Ischemia." Cells Tissues Organs 202, no. 5-6 (2016): 307–18. http://dx.doi.org/10.1159/000445710.

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Human adipose-derived mesenchymal stem cells (hASCs) are an attractive cell source for tissue engineering. However, one obstacle to this approach is that the transplanted hASC population can decline rapidly in the recipient tissue. The aim of this study was to investigate the effects of low-level light therapy (LLLT) on transplanted spheroid hASCs in skin flaps of mice. hASCs were cultured in monolayers or spheroids. LLLT, hASCs, spheroids and spheroids transplanted with LLLT were applied to the skin flaps. Healing of the skin flaps was assessed by gross evaluation and by hematoxylin and eosin staining and elastin van Gieson staining. Compared with the spheroid group, skin flap healing was enhanced in the spheroid + LLLT group, including the neovascularization and regeneration of skin appendages. The survival of hASCs was enhanced by decreased apoptosis of hASCs in the skin flaps of the spheroid + LLLT group. The secretion of growth factors was stimulated in the spheroid + LLLT group compared with the ASC and spheroid groups. These data suggest that LLLT was an effective biostimulator of spheroid hASCs in the skin flaps, enhancing the survival of hASCs and stimulating the secretion of growth factors.
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Dissertations / Theses on the topic "Spheroid"

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White, S. D. M. "Flattening of the Galactic Spheroid." Steward Observatory, The University of Arizona (Tucson, Arizona), 1988. http://hdl.handle.net/10150/623909.

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Digby, Andrew. "Galactic spheroid structure from subluminous stars." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/27910.

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Galactic halo subdwarfs and white dwarfs are locally very scarce and are hence poorly understood. As the most common members of the spheroid, however, they are crucial to the understanding of our own and other galaxies, able to yield key information about the shape, formation, chemical history and dark matter of the spheroid, as well as providing, clues about the processes of stellar evolution. Wide-field photographic data spanning observations taken over long time baselines, such as those available from the SuperCOSMOS Sky Survey (SSS), are unparalleled in their ability to identify large numbers of these dwarf spheroid stars through their large space motions. This is illustrated here by a recent survey of SSS data which, with my involvement, discovered a potential population of cool halo white dwarfs that may constitute a significant proportion of Galactic baryonic dark matter. However, the “Achilles Heel” of photographic astronomy in studies such as this is poor photometry: a problem which can now be circumvented - whilst retaining the astrometric information of the photographic data - with the advent of large-scale, deep CCD surveys with accurate photometry such as the Sloan Digital Sky Survey (SDSS). In this thesis I show that the combination of these two types of dataset brings vast numbers of locally-rare dwarf spheroid stars into the observation reach of astronomers, yielding reliable samples many times larger than have previously been available solely from photographic data. Using SSS data coupled with the SDSS archive I identify a sample of ~2600 candidate subdwarfs through strict selection criteria. This forms one of the largest and most reliable samples of subdwarfs known, and enables accurate determination of luminosity functions along many different lines of sight. I derive the subdwarf luminosity function with unprecedented accuracy to MV 13, finding good agreement with recent local estimates but discrepancy with results for the more distant spheroid. This provides further evidence that the inner and outer parts of the stellar halo cannot be described by a single density distribution. It also use the data to show that the form of the inner spheroid density profile within distances of 2.5 kpc is closely matched by a power law with an index of α = -3.15 ± 0.3.
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Berahim, Zurairah. "The potential of periodontal spheroid for periodontal regeneration." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522565.

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Wetzel, Todd G. "Unsteady flow over a 6:1 prolate spheroid." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-08032007-102246/.

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Chaudhary, Priyanka. "SPHEROID DETECTION IN 2D IMAGES USING CIRCULAR HOUGH TRANSFORM." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/9.

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Three-dimensional endothelial cell sprouting assay (3D-ECSA) exhibits differentiation of endothelial cells into sprouting structures inside a 3D matrix of collagen I. It is a screening tool to study endothelial cell behavior and identification of angiogenesis inhibitors. The shape and size of an EC spheroid (aggregation of ~ 750 cells) is important with respect to its growth performance in presence of angiogenic stimulators. Apparently, tubules formed on malformed spheroids lack homogeneity in terms of density and length. This requires segregation of well formed spheroids from malformed ones to obtain better performance metrics. We aim to develop and validate an automated imaging software analysis tool, as a part of a High-content High throughput screening (HC-HTS) assay platform, to exploit 3D-ECSA as a differential HTS assay. We present a solution using Circular Hough Transform to detect a nearly perfect spheroid as per its circular shape in a 2D image. This successfully enables us to differentiate and separate good spheroids from the malformed ones using automated test bench.
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Westlake, P. C. "Interfacial and internal waves generated by a submerged prolate spheroid." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242629.

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McMillan, Kay Seonaid. "Development of a microfluidic platform for multicellular tumour spheroid assays." Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27926.

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Microfluidics is a valuable technology for a variety of different biomedical applications. In particular, within cancer research, it can be used to improve upon currently used in vitro screening assays by facilitating the use of 3D cell culture models. One of these models is the multicellular tumour spheroid (MCTS), which provides a more accurate reflection of the tumour microenvironment in vivo by reproducing the cell to cell contact, the development of a nutritional gradient and the formation of a heterogeneous population of cells. Therefore, the MCTS provides a more physiologically relevant in vitro model for testing the efficacy of treatments at the preclinical level. Currently, methods for the formation and culture of spheroids have several limitations, including being labour intensive, being low throughput, producing shear stress towards cells and the hanging drop system being unstable to physical shocks. Recently, microfluidics (especially droplet microfluidics) has been employed for the culture and screening of spheroids, providing a high-throughput methodology which only requires small volumes of fluids and small numbers of cells. However, current issues with droplet microfluidics include complicated droplet gelation procedures and short cell culture times. In this thesis, the use of microfluidic technologies as an approach for spheroid formation and culture are investigated with the aim to create a platform for radiotherapeutic and chemotherapeutic treatment of spheroids using cell lines. Initially, the use of emulsion technology at the macro scale was evaluated to determine the best conditions for spheroid culture. Once this was achieved the spheroids were compared to spheroids using a traditional method and radiotherapeutic treatment was conducted. Subsequently, avenues for miniaturising the developed emulsion-based methods were studied to provide a microfluidic technology. Finally, along with identifying the optimal culture conditions using hydrogels, a microfluidic system that integrated both droplet and single phase microfluidics features was developed for the formation and culture of spheroids. Using the latter, proof of principle experiments were conducted to demonstrate the suitability of the platform for both chemotherapeutic and radiotherapeutic assays within the same device.
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Guerra, Joel Tynan. "Investigating the Effect of an Upstream Spheroid on Tandem Hydrofoils." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1959.

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This thesis documents a series of three dimensional unsteady Reynolds Averaged Navier-Stokes CFD simulations used to investigate the influence of an upstream prolate spheroid body on tandem pitching hydrofoils. The model is validated by performing separate CFD simulations on the body and pitching hydrofoils and comparing results to existing experimental data. The simulations were run for a range of Strouhal numbers (0.2-0.5) and phase differences (0-π). Results were compared to identical simulations without an upstream body to determine how the body affects thrust generation and the unsteady flow field. The combined time-averaged thrust increases with Strouhal number, and is highest when the foils pitch out of phase with each other. At intermediate phase differences between φ = 0 and φ = π the leading foil produces significantly more thrust than the trailing foil, peaking at φ = π/2. For St = 0.5 this difference is 21.7%. Results indicate that adding an upstream prolate spheroid body does not significantly alter thrust results, though it does provide a small (nearly negligible) boost. Vorticity from the body is pulled downstream from the pitching foils, which interacts with the vortex generation when the vortex being generated is of the same sign as the body vorticity. This body vorticity does not affect the vorticity magnitude of the downstream vortex pairs.
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Silva, Santisteban Tomas [Verfasser], and Matthias [Akademischer Betreuer] Meier. "Spheroid manipulation on a microfluidic chip platform for biomolecular analysis." Freiburg : Universität, 2017. http://d-nb.info/1144829658/34.

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Jones, Jane Elizabeth Davenport. "Neurotoxic mechanisms underlying ischaemia-reperfusion injury using rat brain spheroid cultures." Thesis, University of Hertfordshire, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302425.

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Books on the topic "Spheroid"

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Rolf, Bjerkvig, ed. Spheroid culture in cancer research. Boca Raton, Fla: CRC Press, 1992.

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Jackson, J. E. Sphere, spheroid and projections for surveyors. Oxford: BSP Professional, 1987.

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United States. National Aeronautics and Space Administration., ed. Ray scattering by an arbitrarily oriented spheroid. [Washington, DC: National Aeronautics and Space Administration, 1996.

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M, Rosenfeld, and United States. National Aeronautics and Space Administration., eds. A Numerical study of separation on a spheroid at incidence. [Washington, DC: National Aeronautics and Space Administration, 1986.

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Vollmers, H. Measured mean velocity field around a l:6 prolate spheroid at various cross sections: Data report. Gottingen: Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt E.V, 1985.

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Kreplin, Hans-Peter. Wall shear stress measurements on a prolate spheroid at zero incidence in the DNW wind tunnel. Gottingen: Koln, 1986.

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Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt, ed. Wall shear stress measurements on a prolate spheroid at zero incidence in the DNW wind tunnel. Köln: DFVLR, 1986.

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O, Braswell Dorothy, and Langley Research Center, eds. Aerodynamics of a sphere and an oblate spheroid for Mach numbers from 0.6 to 10.5 including some effects of test conditions. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1993.

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Stager, Rainer. Turbulenzmessungen in der dreidimensionalen Grenzschicht eines angestellten Rotationsellipsoides. Koln: DLR, 1993.

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United States. National Aeronautics and Space Administration., ed. Monoclonal antibodies directed against surface molecules of multicell spheroids. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "Spheroid"

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Ferenc, Jaroslav, and Charisios D. Tsiairis. "Studying Mechanical Oscillations During Whole-Body Regeneration in Hydra." In Methods in Molecular Biology, 619–33. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2172-1_33.

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AbstractCells of the freshwater cnidarian Hydra possess an exceptional regeneration ability. In small groups of these cells, organizer centers emerge spontaneously and instruct the patterning of the surrounding population into a new animal. This property makes them an excellent model system to study the general rules of self-organization. A small tissue fragment or a clump of randomly aggregated cells can form a hollow spheroid that is able to establish a body axis de novo. Interestingly, mechanical oscillations (inflation/deflation cycles of the spheroid) driven by osmosis accompany the successful establishment of axial polarity. Here we describe different approaches for generating Hydra tissue spheroids, along with imaging and image analysis techniques to investigate their mechanical behavior.
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Leung, Alexander K. C., Cham Pion Kao, Andrew L. Wong, Alexander K. C. Leung, Thomas Kolter, Ute Schepers, Konrad Sandhoff, et al. "Spheroid Body Myopathy." In Encyclopedia of Molecular Mechanisms of Disease, 1959. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-29676-8_5062.

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De Zeeuw, Tim. "Dynamics of the Galactic Spheroid." In The Stellar Populations of Galaxies, 51–60. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2434-8_7.

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Bishop, J. L. "Self-Consistent Oblate-Spheroid Models." In Structure and Dynamics of Elliptical Galaxies, 489–90. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3971-4_87.

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White, Tacey E., Risa A. Saltzman, P. Anthony di Sant’Agnese, Robert Sutherland, and Richard K. Miller. "The Trophoblast in Spheroid Culture." In Placenta as a Model and a Source, 83–92. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0823-2_9.

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Liu, Shuang. "Scaffolded Chondrogenic Spheroid-Engrafted Model." In Methods in Molecular Biology, 17–24. New York, NY: Springer US, 2024. http://dx.doi.org/10.1007/978-1-0716-3682-4_3.

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Andronov, Ivan. "Electromagnetic Wave Diffraction by Spheroid." In Problems of High Frequency Diffraction by Elongated Bodies, 91–137. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1276-6_4.

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Andronov, Ivan. "Acoustic Wave Diffraction by Spheroid." In Problems of High Frequency Diffraction by Elongated Bodies, 61–89. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1276-6_3.

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Yoshida, Takahiro, Hiroaki Okuyama, Hiroko Endo, and Masahiro Inoue. "Spheroid Cultures of Primary Urothelial Cancer Cells: Cancer Tissue-Originated Spheroid (CTOS) Method." In Urothelial Carcinoma, 145–53. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7234-0_12.

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Pfisterer, Larissa, and Thomas Korff. "Spheroid-Based In Vitro Angiogenesis Model." In Methods in Molecular Biology, 167–77. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3628-1_11.

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Conference papers on the topic "Spheroid"

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Salve, Amol Lalchand, Oindrila Banik, and Earu Banoth. "Design and Development of Microfluidic Device for High Throughput Dynamic Spheroid Generation Using 3D Printing and Soft Lithography Technology." In Frontiers in Optics, JD4A.49. Washington, D.C.: Optica Publishing Group, 2024. https://doi.org/10.1364/fio.2024.jd4a.49.

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Cell spheroids replicate in-vitro environments. Our AutoCAD-designed, COMSOL-simulated microfluidic device shows potential for high-throughput dynamic spheroid generation. Simulations and experiments confirm that a flow rate of ≤0.3 ml/hr achieves dynamic cell settling.
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Davis, Aaron C., Madison M. Howard, Emmett Z. Freeman, Luis Solorio, and David J. Cappelleri. "Mobile Microrobot Grippers for Cell Spheroid Micromanipulation." In 2024 International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 1–6. IEEE, 2024. http://dx.doi.org/10.1109/marss61851.2024.10612735.

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Da Silva, Claudia Sampaio, Julia Alicia Boos, Mario Modena, Sreedhar Kumar, Christian Beyer, Thomas Valentin, Andreas Hierlemann, and Vincent Revol. "Electrical Impedance Spectroscopy Platform for Label-Free Characterization of Spheroid Viability." In 2024 IEEE SENSORS, 1–4. IEEE, 2024. https://doi.org/10.1109/sensors60989.2024.10784609.

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Lapenko, A. K., E. R. Ol’hovaya, P. S. Kupcova, E. R. Lyapunova, and L. N. Komarova. "METHOD FOR ESTIMATING THE NUMBER OF VIABLE CELLS IN A CELL SPHEROID USING THE MTT ASSAY." In XI МЕЖДУНАРОДНАЯ КОНФЕРЕНЦИЯ МОЛОДЫХ УЧЕНЫХ: БИОИНФОРМАТИКОВ, БИОТЕХНОЛОГОВ, БИОФИЗИКОВ, ВИРУСОЛОГОВ, МОЛЕКУЛЯРНЫХ БИОЛОГОВ И СПЕЦИАЛИСТОВ ФУНДАМЕНТАЛЬНОЙ МЕДИЦИНЫ. IPC NSU, 2024. https://doi.org/10.25205/978-5-4437-1691-6-27.

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One of the methods forstudying the viability of cell spheroids isthe MTT test. However, this test does not permit the determination of the number of viable cells within the spheroid at different stages of cultivation. Instead, it provides an indirect indication of the metabolic activity of cells. In this study, we propose a method for estimating the number of viable cells in a cell spheroid using the MTT test.
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Samad, A., and S. J. Garrett. "The Convective Instability of Boundary-Layer Flows Over Rotating Spheroids." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78484.

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The continuous development of spinning projectiles and other industrial applications has led to the need to understand the laminar boundary-layer flow and subsequent onset of transition over the general family of rotating spheroids. We begin by finding the laminar boundary-layer flow over a general spheroid. In particular, we distinguish between prolate and oblate spheroids and use an appropriate spheroidal coordinate system in each case. The laminar-flow equations are established for each family of spheroid rotating in otherwise still fluid. An eccentricity parameter e is used to distinguish particular bodies within the oblate or prolate families. In each case, setting e = 0 reduces the equations to those already established by Howarth [2] and Banks [4] for the rotating sphere. In this preliminary study the laminar-flow equations at each latitude are solved by extending the original series solutions due to Howarth and Banks for the rotating sphere. The laminar flows obtained are consistent with established results for the rotating sphere as e tends to zero, and tend to the von Ka´rma´n [5] solution for the rotating disk as the latitude is reduced close to the nose. Analyses of the convective instability are performed on the rotating prolate family. These extend the linear analyses previously published by Malik, Lingwood and Garrett & Peake [6–10] on related geometries. An investigation into the relative importance of type I (crossflow) and type II (streamline curvature) modes is also presented. At low latitudes increasing eccentricity has negligible effects on the stability characteristics of the flow. However as the latitude increases, eccentricity is seen to lower the upper (type I) branch of the neutral curve, reducing the region of instability.
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Stavroudis, Orestes N., and Alan J. Ames. "Confocal spheroids as elements of off-axis reflecting systems." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tun2.

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The problem considered is the design of complicated off-axis mirror systems. The approach is to use components that consist of pairs of prolate spheroidal mirrors which share a common conic focus but not a common axis. By conic focus we mean the focus of the spheroid and not necessarily an optical focus. In this configuration a ray through one of the conic foci must pass through all the others. If pupils are located at each of the conic foci, all such rays must be chief rays. A pseudoaxis is defined as that chief ray about which all other rays are symmetric. A necessary condition for the existence of a pseudoaxis provides relationships between the eccentricities and the angles between the conic axes. Conditions assuring that such a system is afocal or forms an image result in conditions on the vertex curvatures of the spheroids.
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Liang, Wuwei, and Michael P. Enright. "Estimating the Probabilistic Size and Shape Distributions of 3D Anomalies From Sectioning Measurements Using the Stereological Unfolding Approach." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46653.

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The accuracy of probabilistic risk assessment of rotor disks is strongly dependent on the accurate description of the size and shape distributions of anomalies in alloys. These size-shape distributions of anomalies are often derived from planar sectioning data measurements using stereological unfolding algorithms. Since it is impossible to accurately predict the shape and orientation parameters of a general ellipsoid based on measurements obtained from two-dimensional sectioning data, the anomaly model should be limited to a spheroid. In this study, an unfolding algorithm was implemented and verified that can be used to estimate the probabilistic dimensions and orientations of 3D spheroids based on 2D section data. It is shown that the accuracy of the predicted spheroid model is dependent on the number of sections and the discretization of the mesh used to characterize the data.
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Leigh, S. H., G. C. Lee, and C. C. Berndt. "Modelling of Elastic Constants of Plasma Spray Deposits with Spheroid-Shaped Voids." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0587.

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Abstract The five independent elastic constants of plasma spray deposits were calculated from constitutive equations and the microstructural information (void aspect ratios and porosity) were gained from stereological analysis. The voids within the deposit were assumed to be a spheroidal shape. The structure of the deposit was considered to be transversely isotropic with respect to the spray direction, which requires five independent elastic constants of a stiffness tensor. Solid mechanics models containing spheroid-shape voids were applied to obtain the five independent elastic constants of the deposits. The calculated elastic constants were compared to the experimentally determined values.
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Chen, Howard, and Ibrahim T. Ozbolat. "Development of a Multi-Arm Bioprinter for Hybrid Tissue Engineering." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1025.

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This paper highlights the development of a multi-arm bioprinter (MABP) capable of concurrent deposition of multiple materials with independent dispensing parameters including deposition speed, material dispensing rate and frequency for functional zonal-stratified articular cartilage tissue fabrication. The MABP consists of two Cartesian robots mounted in parallel on the same mechanical frame. This platform is used for concurrent filament fabrication and cell spheroid deposition. A single-layer structure is fabricated and concurrently deposited with spheroids to validate this system. Preliminary results showed that the MABP was able to produce filaments and spheroids with well-defined geometry and high cell viability. The resulting filament width has a variation of +/-170 μm and the center-to-center filament distance was within 100 μm of the specified distance. This fabrication system is aimed to be further refined for printing structures with varying porosities to mimic the natural cartilage structure in order to produce functional tissue-engineered articular cartilage using cell spheroids containing cartilage progenitor cells (CPCs).
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Farafonov, Victor G., Vladimir B. Il'in, and Daria G. Turichina. "Light scattering by a spheroid. Relations between ‘spheroidal’ and ‘spherical’ T-matrices." In 2021 Days on Diffraction (DD). IEEE, 2021. http://dx.doi.org/10.1109/dd52349.2021.9598725.

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Reports on the topic "Spheroid"

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Giordano, Federica. SOP for In Vitro Spheroid Formation. ResearchHub Technologies, Inc., April 2024. http://dx.doi.org/10.55277/researchhub.i4casfoc.

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Verma, Ghasi R., and E. R. Robinson. Parabolic Equation Starting Field For a Prolate Spheroid Source. Fort Belvoir, VA: Defense Technical Information Center, August 1990. http://dx.doi.org/10.21236/ada226281.

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Pham, Van Phuc. In vivo functions of cartilage tissues formed from spheroid-scaffold complexes. Biomedpress, 2019. http://dx.doi.org/10.15419/arr.2019.1.

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Wynn, W. M. Permeable Prolate Spheroid in an External Field: Demagnetization and Gradiometer Performance. Fort Belvoir, VA: Defense Technical Information Center, February 1992. http://dx.doi.org/10.21236/ada245932.

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Rines, Jan, and Percy Donaghay. Interactions of Small-Scale Physical Mixing Processes with the Structure, Morphology and Bloom Dynamics of Non-Spheroid Diatoms. Fort Belvoir, VA: Defense Technical Information Center, September 1999. http://dx.doi.org/10.21236/ada629825.

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Rines, Jan, and Percy Donaghay. Interactions of Small-Scale Physical Mixing Processes with the Structure, Morphology, Bloom Dynamics and Optics of Non-spheroid Phytoplankton. Fort Belvoir, VA: Defense Technical Information Center, September 2003. http://dx.doi.org/10.21236/ada628520.

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Rines, Jan, and Percy Donaghay. Interactions of Small-Scale Physical Mixing Processes with the Structure, Morphology and Bloom Dynamics and Optics of Non-Spheroid Phytoplankton. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada627715.

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Furbert-Harris, Paulette M. Eosinophil Cell Lines in a Tri-Cell Multicellular Tumor Spheroid (MTS)/Endothelium Complex: Down Regulation of Adhesion and Integrin Molecules-Implications of Metastasis Inhibition. Fort Belvoir, VA: Defense Technical Information Center, October 2003. http://dx.doi.org/10.21236/ada442676.

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Cohen, Leonard D., Richard D. Haracz, and Ariel Cohen. Electromagnetic Scattering Properties of Finite Cylinders and Spheroids. Fort Belvoir, VA: Defense Technical Information Center, November 1985. http://dx.doi.org/10.21236/ada163034.

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Dorsey, Russell M., Janna S. Madren-Whalley, Harry Salem, Robert L. Kristovich, and Leah R. Valdes. Method for Processing Liver Spheroids Using an Automatic Tissue Processor. Fort Belvoir, VA: Defense Technical Information Center, May 2016. http://dx.doi.org/10.21236/ad1009565.

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