Introduction: There has been a curiosity about the spheroid geometry for PET scanners developments since several years ago, therefore in this study, we are aiming to evaluate the performance of this geometry and compare its performance with cylindrical geometry using Monte Carlo simulation. Methods: We simulated a spheroid geometry with a radius of 199 mm...

objective: to assess relative biological effectiveness (rbe) of 131i radiation relative to 60co gamma rays in glioblastoma spheroid cells. materials and methods: in this experimental study, glioblastoma spheroid cells were exposed to 131i radiation and 60co gamma rays. radiation induced dna damage was evaluated by alkaline comet assay. samples of spheroid cells were treated by radiation from 13...

Background: Radiotherapy is an established therapeutic modality for prostate cancer. Resveratrol, a natural antioxidant, has been shown to inhibit carcinogenesis and to block the process of tumor initiation and progression. No data is available on the response of cellular spheroid to Reseveratol. In this study we have examined the effect of Resveratol on the radiation response of human p...

A polymeric crosslinker poly(ethylene glycol) derivative with dioleyl groups as hydrophobic group at both ends was developed for promoting cellular spheroid formation. Our approach to bridge cells was based on the crosslinking of cell membrane using a crosslinker via the hydrophobic interaction. Using the crosslinker, spheroid formation of pancreatic -cell line RIN in a round bottom 96-well pla...

background: proliferation and expansion of cancer stem cells as spheroids were proved in previous studies. but, capability of primary tumor-derived stem cells to keep their unique properties in vitro is still disputed. so, the goal of this study was to isolate, expand and characterize of colon cancer-derived stem cells. material and methods: in the present work, colon cancer stem cells markers ...

background: gastric cancer (gc) is widely associated with chronic inflammation. the pro inflammatory microenvironment provides conditions that disrupt stem/progenitor cell proliferation and differentiation. the signal transducer and activator of transcription- 3 (stat3) signaling pathway is involved in inflammation and also contributes to the maintenance of embryonic stem cell (escs) pluripoten...

This paper presents a multicellular spheroid chip capable of forming and extracting three-dimensional (3D) spheroids using removable cell trapping barriers. Compared to the conventional macro-scale spheroid formation methods, including spinning, hanging-drop, and liquid-overlay methods, the recent micro-scale spheroid chips have the advantage of forming smaller spheroids with better uniformity....

Gaussian beam scattering by a spheroidal particle is studied in detail. A theoretical procedure is given to expand an incident Gaussian beam in terms of spheroidal vector wave functions within the generalized Lorenz-Mie theory framework. Exact analytic solutions are obtained for an arbitrarily oriented spheroid with nonconfocal dielectric coating. Normalized differential scattering cross sectio...

We analyze 166 spheroid subdwarfs found in 53 Ðelds observed with the Wide Field (6.5\ M V \ 14.5) Planetary Camera on the Hubble Space T elescope. The Ðelds cover 221 arcmin2 over a wide range of directions. The spheroid luminosity function (LF) is inconsistent at about the 3 p level with the local spheroid LF of Dahn et al. even when the normalization of the latter is corrected to take accoun...

We analyze 166 spheroid subdwarfs (6.5 < MV < 14.5) found in 53 fields observed with the Wide Field Camera on the Hubble Space Telescope. The fields cover 221 arcmin2 over a wide range of directions. The spheroid luminosity function (LF) is inconsistent at about the 3 σ level with the local spheroid LF of Dahn et al. even when the normalization of the latter is corrected to take account of the ...