Current thinking on how the Toxoplasma gondii parasite invades its host is incorrect, according to a study published today in Nature Methods describing a new technique to knock out genes. The findings could have implications ...
Definition. Coral bleaching is a process whereby the coral colonies lose their colour, either due to the loss of pigments by microscopic algae (zooxanthellae) living in symbiosis with their host organisms (polyps), or because these zooxanthellae have been expelled.
Notes. 1  Dove SG, Hoegh-Guldberg O (2006).  2 The Great Barrier Reef: a catastrophe laid bare.  3 Coral bleaching on Great Barrier Reef worse than expected, surveys show.  4 The United Nations just released a warning that the Great Barrier Reef is dying.  5 Mass coral bleaching hits the Great Barrier Reef for the second year in a row.