|
koods
Ribbit



Registered: 05/26/11
Posts: 106,066
Loc: Maryland/DC Burbs
Last seen: 5 hours, 27 minutes
|
Re: 14 year old with cancer to by Cryogenically frozen until there is a cure [Re: Crystal G]
#23847630 - 11/19/16 07:37 AM (7 years, 2 months ago) |
|
|
Quote:
Crystal G said:
Quote:
Visionary Tools said: http://www.extension.umn.edu/food/food-safety/preserving/freezing/the-science-of-freezing-foods/
Quote:
When the water freezes, it expands and the ice crystals cause the cell walls to rupture. Consequently, the texture of the produce, when thawed, will be much softer than it was when raw.
As I said earlier, supposedly they freeze the body at a much slower rate so the cells don't get damaged in the process. Intracellular rupture can be avoided if you freeze slowly, since it gives enough time for water to periodically leave the cell during freezing.
I'm pretty certain this method works in cell preservation though, considering the same slow-freezing method has been used in the first frozen human embryo birth.
But you're right, a lot of this is just a huge money-making scheme. Who even knows whether they really do any of the shit they're claiming to do, the whole thing could be a huge scam for all we know. It's not like anybody will be checking up to see if any of the bodies they put in there are still frozen and in good condition 50 to 100 years from now. And what happens in the event of a power outage I wonder?
Seems much more likely that we will end up having a World War 3 crisis and all these cryogenic facilities end up getting blown up to bits, before we ever find a way to revive the death.
You have that backwards. Slow freezing creates large crystals. You can freeze an embryo very quickly by putting it in liquid nitrogen. You can't do that with a body. The surface will freeze quickly, but underneath freezing occurs more slowly.
--------------------
NotSheekle said “if I believed she was 16 I would become unattracted to her”
|
Crystal G



Registered: 06/05/07
Posts: 19,584
Loc: outer space
Last seen: 8 months, 6 days
|
Re: 14 year old with cancer to by Cryogenically frozen until there is a cure [Re: koods]
#23847642 - 11/19/16 07:44 AM (7 years, 2 months ago) |
|
|
I'm not a science person and I don't claim to be one, so I'll just copy and paste what Wikipedia says about this. Supposedly these are the techniques used to prevent ice crystal cellular damage:
Quote:
Slow programmable freezing[edit] Controlled-rate and slow freezing, also known as slow programmable freezing (SPF),[7] is a set of well established techniques developed during the early 1970s which enabled the first human embryo frozen birth Zoe Leyland during 1984. Since then, machines that freeze biological samples using programmable sequences, or controlled rates, have been used all over the world for human, animal and cell biology – "freezing down" a sample to better preserve it for eventual thawing, before it is frozen, or cryopreserved, in liquid nitrogen. Such machines are used for freezing oocytes, skin, blood products, embryo, sperm, stem cells and general tissue preservation in hospitals, veterinary practices and research laboratories around the world. As an example, the number of live births from frozen embryos 'slow frozen' is estimated at some 300,000 to 400,000 or 20% of the estimated 3 million in vitro fertilisation (IVF) births.[8]
Lethal intracellular freezing can be avoided if cooling is slow enough to permit sufficient water to leave the cell during progressive freezing of the extracellular fluid. To minimize the growth of extracellular ice crystal growth and recrystallization,[9] biomaterials such as alginates, poly vinyl alcohol or chitosan can be used to impede ice crystal growth along with traditional small molecule cryoprotectants.[10] That rate differs between cells of differing size and water permeability: a typical cooling rate of about 1 °C/minute is appropriate for many mammalian cells after treatment with cryoprotectants such as glycerol or dimethyl sulphoxide, but the rate is not a universal optimum. The 1 °C / minute rate can be achieved by using devices such as a rate-controlled freezer or a benchtop portable freezing container.[11]
Several independent studies have provided evidence that frozen embryos stored using slow-freezing techniques may in some ways be 'better' than fresh in IVF. The studies indicate that using frozen embryos and eggs rather than fresh embryos and eggs reduced the risk of stillbirth and premature delivery though the exact reasons are still being explored.
Vitrification[edit] Researchers Greg Fahy and William F. Rall helped introduce vitrification to reproductive cryopreservation in the mid-1980s.[12] As of 2000, researchers claim vitrification provides the benefits of cryopreservation without damage due to ice crystal formation.[13] The situation became more complex with the development of tissue engineering as both cells and biomaterials need to remain ice-free to preserve high cell viability and functions, integrity of constructs and structure of biomaterials. Vitrification of tissue engineered constructs was first reported by Lilia Kuleshova,[14] who also was the first scientist to achieve vitrification of woman’s eggs (oocytes), which resulted in live birth in 1999.[15] For clinical cryopreservation, vitrification usually requires the addition of cryoprotectants prior to cooling. The cryoprotectants act like antifreeze: they decrease the freezing temperature. They also increase the viscosity. Instead of crystallizing, the syrupy solution becomes an amorphous ice—it vitrifies. Rather than a phase change from liquid to solid by crystallization, the amorphous state is like a "solid liquid", and the transformation is over a small temperature range described as the "glass transition" temperature.
Vitrification of water is promoted by rapid cooling, and can be achieved without cryoprotectants by an extremely rapid decrease of temperature (megakelvins per second). The rate that is required to attain glassy state in pure water was considered to be impossible until 2005.[16]
Two conditions usually required to allow vitrification are an increase of the viscosity and a decrease of the freezing temperature. Many solutes do both, but larger molecules generally have a larger effect, particularly on viscosity. Rapid cooling also promotes vitrification.
For established methods of cryopreservation, the solute must penetrate the cell membrane in order to achieve increased viscosity and decrease freezing temperature inside the cell. Sugars do not readily permeate through the membrane. Those solutes that do, such as dimethyl sulfoxide, a common cryoprotectant, are often toxic in intense concentration. One of the difficult compromises of vitrifying cryopreservation concerns limiting the damage produced by the cryoprotectant itself due to cryoprotectant toxicity. Mixtures of cryoprotectants and the use of ice blockers have enabled the Twenty-First Century Medicine company to vitrify a rabbit kidney to -135 °C with their proprietary vitrification mixture. Upon rewarming, the kidney was transplanted successfully into a rabbit, with complete functionality and viability, able to sustain the rabbit indefinitely as the sole functioning kidney.[17]
https://en.wikipedia.org/wiki/Cryopreservation#Slow_programmable_freezing
|
LogicaL Chaos
Ascension Energy & Alien UFOs




Registered: 05/12/07
Posts: 69,369
Loc: The Inexpressible...
Last seen: 43 seconds
|
Re: 14 year old with cancer to by Cryogenically frozen until there is a cure [Re: Crystal G]
#23847924 - 11/19/16 09:49 AM (7 years, 2 months ago) |
|
|
"To minimize the growth of extracellular ice crystal growth and recrystallization,[9] biomaterials such as alginates, poly vinyl alcohol or chitosan can be used to impede ice crystal growth along with traditional small molecule cryoprotectants."

Amazing!
|
|