An enzymatic globin from a marine worm
Article Abstract:
The marine worm Amphitrite ornata is able to tolerate the halocompounds secreted by some other marine worm species as they are degraded by dehaloperoxidase (DHP). It has been possible to establish the amino-acid sequence and crystal structure of DHP. Its fold was found to be typical of the globin family, showing that the enzyme evolved from an oxygen carrier protein. The complete amino-acid sequence is most similar to that of myoglobin from the sea hare. It is suggested that DHP binds peroxide and uses the distal histidiine to cleave the O-O bond.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Worms bask in extreme temperatures
Article Abstract:
Temperature is an important environmental factor governing the distribution of a species. It is shown that a colony-dwelling polychaete worm, which inhabits deep-sea hydrothermal vent chimneys, often experience temperatures of over 80 degrees centigrade, and a thermal gradient of 60 degrees centigrade. Self-recording time-lapse temperature probes were used to study the Pompeii worm. The study indicates that tubes channel the hot diffuse flow fluids over the body of the worm, maintaining a continuous flushed high-temperature environment.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Creep-strengthening of steel at high temperatures using nano-sized carbonitride dispersions
Article Abstract:
Creep is a time-dependent mechanism of plastic deformation, which helps metals, and alloys to be designed which can withstand at high temperature. High-temperature creep-resistant ferritic steels achieve optimal creep strength through the dispersion of yttrium oxide nanoparticles.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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