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Cryopreservation can be used to store equine oocytes for extended periods so that they can be used in artificial reproduction technologies at a desired time point. It requires use of cryoprotective agents (CPAs) to protect the oocytes against freezing injury. The intracellular introduction of CPAs, however, may cause irreversible osmotic damage. The response of cells exposed to CPA solutions is governed by the permeability of the cellular membrane towards water and the CPAs. In this study, a mathematical mass transport model describing the permeation of water and CPAs across an oocyte membrane was used to simulate oocyte volume responses and concomitant intracellular CPA concentrations during the exposure of oocytes to CPA solutions. The results of the analytical simulations were subsequently used to develop a phenomenological finite element method (FEM) continuum model to capture the response of oocytes exposed to CPA solutions with spatial information. FEM simulations were used to depict spatial differences in CPA concentration during CPA permeation, namely at locations near the membrane surface and towards the middle of the cell, and to capture corresponding changes in deformation and hydrostatic pressure. FEM simulations of the multiple processes occurring during CPA loading of oocytes are a valuable tool to increase our understanding of the mechanisms underlying cryopreservation outcome.
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http://dx.doi.org/10.1038/s41598-021-99287-9 | DOI Listing |
Circ Econ Sustain
May 2024
School of Law, University College Cork, Cork, Ireland.
The global pollution and waste crisis presents us with environmental and economic challenges which if not properly addressed could destabilise or threaten the survival and welfare of societies. The European Union is responding to the waste and pollution crisis through its circular economy agenda that adopts a broad life-cycle approach to the regulation of plastics from production, consumption, disposal, and recycling. To operationalise its agenda, the European Union seeks to mobilise all actors towards the objective of improving the economics of plastic recycling.
View Article and Find Full Text PDFJ Occup Environ Hyg
December 2024
Department of Pharmacy, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan.
Hypochlorous acid (HClO), one of the major reactive oxygen species, is obtained by electrolyzing a sodium chloride solution. HClO is a safe and effective disinfectant and decomposing agent widely used as an alternative to sodium hypochlorite (NaClO). In this study, the authors aimed to evaluate the safety and efficiency of HClO generated by electrolyzing sodium chloride as a decontaminant.
View Article and Find Full Text PDFCryobiology
December 2024
Department of Surgery, University of Alberta, Edmonton, Alberta, Canada. Electronic address:
Successful cryopreservation of articular cartilage (AC) depends on a number of variables, including heat transfer, sample packaging for cryogenic storage, cryoprotectant agent (CPA) concentration (toxicity), and CPA permeation into AC. In the first experiment of the present study, we used a combination of our established vitrification protocol (430-min multi-step loading Protocol 8) and the metal Ovarian Tissue Cryosystem (OTC) as a closed vitrification-storage-rewarming container to vitrify 7-mm diameter porcine osteochondral dowels with 2 methods of storage (storage in the OTC with or without a surrounding vitrification solution). In the second experiment, in an attempt to introduce a more reproducible and safe vitrification protocol, we employed our successful Protocol 8 with the OTC as the CPA loading container and a cryobag as the storage container (with or without surrounding vitrification solution).
View Article and Find Full Text PDFbioRxiv
November 2024
Department of Mechanical Engineering, University of Minnesota, Minneapolis, USA.
Organ banking by vitrification could revolutionize transplant medicine. However, vitrification and rewarming have never been demonstrated at the human organ scale. Using modeling and experimentation, we tested the ability to vitrify and rewarm 0.
View Article and Find Full Text PDFSensors (Basel)
November 2024
Elettra-Sincrotrone Trieste S.C.p.A. Science Park, Strada Statale 14, km 163.5, 34149 Basovizza, Italy.
Field programmable gate arrays (FPGAs) have not only enhanced traditional sensing methods, such as pixel detection (CCD and CMOS), but also enabled the development of innovative approaches with significant potential for particle detection. This is particularly relevant in terahertz (THz) ray detection, where microbolometer-based focal plane arrays (FPAs) using microelectromechanical (MEMS) resonators are among the most promising solutions. Designing high-performance, high-pixel-density sensors is challenging without FPGAs, which are crucial for deterministic parallel processing, fast ADC/DAC control, and handling large data throughput.
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