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• W2039352012 abstract "Long-term cryopreservation of islets of Langerhans would be advantageous to a clinical islet transplantation program. Fundamental cryobiology utilizes knowledge of basic biophysical characteristics to increase the understanding of the preservation process and possibly increase survival rate. In this study several of these previously unreported characteristics have been determined for individual islet cells isolated from Golden hamster islets. Using an electronic particle counting device and a temperature control apparatus, dynamic volumetric response of individual islet cells to anisosmotic challenges of 1.5 M dimethyl sulfoxide (DMSO) and 1.5 M ethylene glycol (EG) were recorded at four temperatures (8, 22, 28, and 37°C). The resulting curves were fitted using Kedem and Katchalsky equations which describe water flux and cryoprotectant agent (CPA) flux based on hydraulic conductivity (Lp), CPA permeability (Ps), and reflection coefficient (ς) for the membrane. For Golden hamster islet cells,Lp,Ps, and ς for DMSO at 22°C were found to be 0.23 ± 0.06 μm/min/atm, 0.79 ± 0.32 × 10−3cm/min, and 0.55 ± 0.37 (n= 11) (mean ± SD), respectively. For EG at 22°C,Lpequaled 0.23 ± 0.06 μm/min/atm,Psequaled 0.63 ± 0.20 × 10−3cm/min, and ς was 0.75 ± 0.17 (n= 9). Arrhenius plots (lnLpor lnPsversus 1/temperature (K)) were created by adding the data from the other three temperatures and the resulting linear regression yielded correlation coefficients (r) of 0.99 for all four plots (LpandPsfor both CPAs). Activation energies (Ea) ofLpandPswere calculated from the slopes of the regressions. The values for DMSO were found to be 12.43 and 18.34 kcal/mol forLpandPs(four temperatures, totaln= 52), respectively. For EG,EaofLpwas 11.69 kcal/mol andEaofPswas 20.35 kcal/mol (four temperatures, totaln= 58)." @default.
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• W2039352012 date "1998-12-01" @default.
• W2039352012 modified "2023-09-26" @default.
• W2039352012 title "Hydraulic Conductivity (Lp) and Its Activation Energy (Ea), Cryoprotectant Agent Permeability (Ps) and ItsEa, and Reflection Coefficients (ς) for Golden Hamster Individual Pancreatic Islet Cell Membranes" @default.
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• W2039352012 doi "https://doi.org/10.1006/cryo.1998.2124" @default.
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