There is amother important issue that I believe should be considered, namely
pressure at the sea bed. Water is not boiling at 400C down there simply
because the pressure is too high. In respect to boiling point, the 400C
corrected to high pressure is in fact around 70-80C. That is why most
thermophiles have in lab conditions temperature optimum ~70C. None of these
bacteria will grow in boiling water (100C) at normal atmospheric pressure.
Of course, thermophiles have a lot of adaptations that allow them to survive
at high temperatures: heat stable proteins and special chaperons, more
viscous lipids of the membrane and other characterized and yet to be
discovered. Another factor is salinity, especially higher mineralization
near the thermal vents. Many extremophiles are halophiles as well.
"Remond" <cpc272688 at yahoo.com> wrote in message
news:890c20f2.0203090333.397c9a64 at posting.google.com...
> When someone know that the temperature in a hydrothermal vent can
> reach 400 degrees Celsius, he will think that this place(hydrothermal
> vent) is not a good place for life. But after many years of search,
> many scientists prove the existence of many forms of life live around
> these vents by using the submersible Alvin. The question is: How these
> forms of life can stand with this extreme temperature?