Cumulonimbus calvus is characterized by distinctive ( between other types of cumulonimbus cloud ) rounded shape and relatively sharp edges of its top area, unlike cumulonimbus incus or cumulonimbus capillatus, which have cirriform tops.
2.
""'Desulfovibrio capillatus " "'is a Gram-negative and sulfate-reducing bacterium from the genus of Desulfovibrio which has been isolated from a oil field separator in the Gulf of Mexico.
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With highly unstable atmospheric conditions, large cumulus may continue to grow into cumulonimbus " calvus " ( essentially a very tall congestus cloud that produces thunder ), then ultimately into the species " capillatus " when supercooled water droplets at the top of the cloud turn into ice crystals giving it a cirriform appearance.
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