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#cryopreservation

7 public questions tagged with this topic.

Animal Tissue Culture 2

The temperature of liquid nitrogen used for cryopreservation is:

Liquid nitrogen provides ultralow storage temperature of -196°C at atmospheric pressure, close to its boiling point. At this temperature, kinetic energy of molecules becomes extremely low, effectively halting all biochemical reactions, enzymatic activity, solute diffusion, and ice recrystallization processes. Cells suspended in DMSO-containing freezing medium enter glassy state preventing further ice growth. Long-term viability preserved for decades to theoretically indefinitely. Mechanical ultra-low freezers at -80°C slow metabolism but do not fully arrest chemical reactions; free radical acc

Ref: ATCC Animal Cell Culture Guide Liquid Nitrogen -196°C arrests metabolism; Freshney Ch.22 Vapor vs liquid phase storage principles.

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Animal Tissue Culture 2

Cryopreservation of animal cells commonly uses:

Cryopreservation of mammalian cells routinely employs dimethyl sulfoxide as penetrating cryoprotectant at 5-10% concentration. DMSO is small amphipathic molecule freely crossing lipid bilayer, replacing intracellular water and disrupting hydrogen bonding network required for ice lattice formation. During controlled slow cooling at -1°C per minute achieved using isopropanol containers like Mr. Frosty or programmable freezers, extracellular ice forms first creating osmotic gradient that draws water out of cells dehydrating them. DMSO lowers freezing point, promotes vitrification where residual i

Ref: Freshney Ch.22 Cryopreservation DMSO prevents intracellular ice; Mazur Science 1984 kinetics of water loss and vitrification by DMSO.

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Basic Applied Biology

Temperature of liquid nitrogen used in cryopreservation is:

Liquid nitrogen at atmospheric pressure liquefies at minus 196 Celsius, providing ultra-low temperature environment where molecular diffusion essentially ceases, enzymatic catalysis halts, aqueous solutions enter amorphous glassy state rather than crystalline ice if cooling rapid enough, and cellular aging arrested for decades to centuries. This temperature lies well below glass transition of water-cryoprotectant mixtures around minus 130 Celsius where dangerous devitrification and ice recrystallization occur, ensuring stability during long-term storage. Freezers at minus 80 Celsius or minus 2

Ref: Mazur Journal General Physiology 1984 cryobiology principles; ATCC cryopreservation guide LN2 minus 196; Alberts cell storage methods.

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Basic Applied Biology

Cryoprotectant commonly used for animal cells is:

Cryopreservation enables essentially indefinite storage of mammalian cell lines and primary cells by arresting biochemical reactions at cryogenic temperatures, but prevention of lethal intracellular ice formation crucial. Dimethyl sulfoxide at 5 to 10 percent volume per volume emerged as standard cryoprotectant for most animal cells due to rapid membrane permeability coefficient 10^-5 cm per second, colligative depression of freezing point, ability to replace water molecules via hydrogen bonding and promotion of vitrification rather than crystallization that would mechanically puncture organel

Ref: Pegg Principles of Cryopreservation 2015; Freshney Ch freezing and cryopreservation; PubMed cryoprotectant toxicity PMID 21846505.

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Biosphere reserve & Wild life sancturies

Cryopreservation is carried out at

Cryopreservation ensures long-term conservation by storing viable cells, tissues, gametes, embryos, seeds, and pollen at ultra-low temperature where metabolism essentially halts but viability retained upon thawing. Standard method uses liquid nitrogen at -196°C boiling point, with slow freezing or vitrification using cryoprotectants dimethyl sulfoxide DMSO and glycerol preventing intracellular ice crystal damage. Applications include preservation of endangered plant germplasm at NBPGR New Delhi, animal gamete biobanking at LaCONES Hyderabad, and microbial culture collections supporting future

Ref: NBPGR Gene Bank Manual Cryopreservation -196°C; NCERT Biotechnology Principles Cryoprotectants

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