>>Samples of permafrost sediment frozen for the past 40,000 years were recently thawed to reveal living nematodes.

Within weeks the roundworms began to move and eat, setting a record for the time an animal can survive cryogenic preservation.<<

>>Some of the worms – belonging to the genus Panagrolaimus – were found 30 metres (100 feet) underground in what had once been a ground squirrel burrow which caved in and froze over around 32,000 years ago.

Others from the genus Plectus were found in a bore sample at a depth of around 3.5 metres (about 11.5 feet). Carbon dating was used to determine that sample to be about 42,000 years old.<<

https://www.sciencealert.com/40-000-year-old-nematodes-revived-siberian-permafrost

PermeateFree said:

>>Samples of permafrost sediment frozen for the past 40,000 years were recently thawed to reveal living nematodes.

Within weeks the roundworms began to move and eat, setting a record for the time an animal can survive cryogenic preservation.<<

>>Some of the worms – belonging to the genus Panagrolaimus – were found 30 metres (100 feet) underground in what had once been a ground squirrel burrow which caved in and froze over around 32,000 years ago.

Others from the genus Plectus were found in a bore sample at a depth of around 3.5 metres (about 11.5 feet). Carbon dating was used to determine that sample to be about 42,000 years old.<<

https://www.sciencealert.com/40-000-year-old-nematodes-revived-siberian-permafrost

Small worry I suppose a long frozen virus/bacteria is revived and is deadly

PermeateFree said:

>>Samples of permafrost sediment frozen for the past 40,000 years were recently thawed to reveal living nematodes.

Within weeks the roundworms began to move and eat, setting a record for the time an animal can survive cryogenic preservation.<<

>>Some of the worms – belonging to the genus Panagrolaimus – were found 30 metres (100 feet) underground in what had once been a ground squirrel burrow which caved in and froze over around 32,000 years ago.

Others from the genus Plectus were found in a bore sample at a depth of around 3.5 metres (about 11.5 feet). Carbon dating was used to determine that sample to be about 42,000 years old.<<

https://www.sciencealert.com/40-000-year-old-nematodes-revived-siberian-permafrost

That’s interesting.

PermeateFree said:

>>Samples of permafrost sediment frozen for the past 40,000 years were recently thawed to reveal living nematodes.

Within weeks the roundworms began to move and eat, setting a record for the time an animal can survive cryogenic preservation.<<

>>Some of the worms – belonging to the genus Panagrolaimus – were found 30 metres (100 feet) underground in what had once been a ground squirrel burrow which caved in and froze over around 32,000 years ago.

Others from the genus Plectus were found in a bore sample at a depth of around 3.5 metres (about 11.5 feet). Carbon dating was used to determine that sample to be about 42,000 years old.<<

https://www.sciencealert.com/40-000-year-old-nematodes-revived-siberian-permafrost

How long did snowball earth last?

roughbarked said:

PermeateFree said:

>>Samples of permafrost sediment frozen for the past 40,000 years were recently thawed to reveal living nematodes.

Within weeks the roundworms began to move and eat, setting a record for the time an animal can survive cryogenic preservation.<<

>>Some of the worms – belonging to the genus Panagrolaimus – were found 30 metres (100 feet) underground in what had once been a ground squirrel burrow which caved in and froze over around 32,000 years ago.

Others from the genus Plectus were found in a bore sample at a depth of around 3.5 metres (about 11.5 feet). Carbon dating was used to determine that sample to be about 42,000 years old.<<

https://www.sciencealert.com/40-000-year-old-nematodes-revived-siberian-permafrost

How long did snowball earth last?

Anyway, it was longer than 40,000 years and life came back.

roughbarked said:

roughbarked said:

PermeateFree said:

>>Samples of permafrost sediment frozen for the past 40,000 years were recently thawed to reveal living nematodes.

Within weeks the roundworms began to move and eat, setting a record for the time an animal can survive cryogenic preservation.<<

>>Some of the worms – belonging to the genus Panagrolaimus – were found 30 metres (100 feet) underground in what had once been a ground squirrel burrow which caved in and froze over around 32,000 years ago.

Others from the genus Plectus were found in a bore sample at a depth of around 3.5 metres (about 11.5 feet). Carbon dating was used to determine that sample to be about 42,000 years old.<<

https://www.sciencealert.com/40-000-year-old-nematodes-revived-siberian-permafrost

How long did snowball earth last?

Anyway, it was longer than 40,000 years and life came back.

Don’t think the seas froze to any depth.

PermeateFree said:

roughbarked said:

roughbarked said:

How long did snowball earth last?

Anyway, it was longer than 40,000 years and life came back.

Don’t think the seas froze to any depth.

How deep were they?

roughbarked said:

PermeateFree said:

roughbarked said:

Anyway, it was longer than 40,000 years and life came back.

Don’t think the seas froze to any depth.

How deep were they?

Lets just say there was plenty of sea not frozen.

PermeateFree said:

roughbarked said:

PermeateFree said:

Don’t think the seas froze to any depth.

How deep were they?

Lets just say there was plenty of sea not frozen.

Well there had to be some.

PermeateFree said:

>>Samples of permafrost sediment frozen for the past 40,000 years were recently thawed to reveal living nematodes.

Within weeks the roundworms began to move and eat, setting a record for the time an animal can survive cryogenic preservation.<<

>>Some of the worms – belonging to the genus Panagrolaimus – were found 30 metres (100 feet) underground in what had once been a ground squirrel burrow which caved in and froze over around 32,000 years ago.

Others from the genus Plectus were found in a bore sample at a depth of around 3.5 metres (about 11.5 feet). Carbon dating was used to determine that sample to be about 42,000 years old.<<

https://www.sciencealert.com/40-000-year-old-nematodes-revived-siberian-permafrost

Oh excellent. That could mean that there’s no limitation to the survival time for cryogenic preservation of eukaryotic tissue.

I wonder what would happen if a similar test could be done on cryonic survival of the fauna of Lake Vostok, to see whether such survival is limited to nemotodes.

Lake Vostok animals include:

• water flea
• spingtail
• tardigrade – already known to be quite hardy
• rotifer
• bivalve mollusc
• sea anenome

mollwollfumble said:

PermeateFree said:

>>Samples of permafrost sediment frozen for the past 40,000 years were recently thawed to reveal living nematodes.

Within weeks the roundworms began to move and eat, setting a record for the time an animal can survive cryogenic preservation.<<

>>Some of the worms – belonging to the genus Panagrolaimus – were found 30 metres (100 feet) underground in what had once been a ground squirrel burrow which caved in and froze over around 32,000 years ago.

Others from the genus Plectus were found in a bore sample at a depth of around 3.5 metres (about 11.5 feet). Carbon dating was used to determine that sample to be about 42,000 years old.<<

https://www.sciencealert.com/40-000-year-old-nematodes-revived-siberian-permafrost

Oh excellent. That could mean that there’s no limitation to the survival time for cryogenic preservation of eukaryotic tissue.

I wonder what would happen if a similar test could be done on cryonic survival of the fauna of Lake Vostok, to see whether such survival is limited to nemotodes.

Lake Vostok animals include:

• water flea
• spingtail
• tardigrade – already known to be quite hardy
• rotifer
• bivalve mollusc
• sea anenome
  

Aren’t tardigrades also mentioned in the article as having something like 16,000 years suspended animation?