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Crossing Over01:34

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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In cross-sectional research, a researcher compares multiple segments of the population at the same time. If they were interested in people's dietary habits, the researcher might directly compare different groups of people by age. Instead of following a group of people for 20 years to see how their dietary habits changed from decade to decade, the researcher would study a group of 20-year-old individuals and compare them to a group of 30-year-old individuals and a group of 40-year-old...
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Preparation of Giant Vesicles Encapsulating Microspheres by Centrifugation of a Water-in-oil Emulsion
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Emulsion Cross-Linking Technique for Human Fibroblast Encapsulation.

Watcharaphong Chaemsawang1, Weerapong Prasongchean2, Konstantinos I Papadopoulos3

  • 1Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok, Thailand.

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Researchers developed microcapsules for cell delivery using biodegradable polymers. The emulsion cross-linking method with Tween 80 optimized cell survival and particle stability for potential therapeutic applications.

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Drug Delivery Systems

Background:

  • Microencapsulation using biodegradable polymers is a promising technique for drug and cell delivery.
  • Current applications include probiotic delivery, highlighting the potential for broader therapeutic uses.
  • Encapsulating mammalian cells could revolutionize future disease treatments.

Purpose of the Study:

  • To prepare microcapsules of human fibroblast cells (CRL2522) using an emulsion cross-linking technique.
  • To optimize microencapsulation parameters for stable particle size, morphology, and cell viability.
  • To assess the potential of this method for clinical cell delivery applications.

Main Methods:

  • Human fibroblast cells (CRL2522) were encapsulated using an emulsion cross-linking method.
  • Tween 80 surfactant was utilized at a 2% concentration during phase inversion to achieve optimal results.
  • Particle size, morphology, and cell survival rates were evaluated over a 14-day period.

Main Results:

  • The optimal Tween 80 concentration of 2% yielded the most stable microcapsule size and morphology.
  • Cell survival rates remained at or above 50% on day 14 post-encapsulation.
  • The emulsion cross-linking technique produced smaller, potentially more diverse microcapsules.

Conclusions:

  • Emulsion cross-linking is an effective method for microencapsulating human fibroblast cells.
  • Optimized conditions using Tween 80 enhance microcapsule stability and cell viability.
  • This technology holds significant potential for the clinical development of encapsulated cell delivery systems for disease treatment.