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.
Photos: Australia's Great Barrier Reef suffers 'extreme' coral bleaching Driven by ocean temperatures that have been 1-2 degrees Celsius (1.8-3.6Â° F) above average, the bleaching event has left large sections of coral drained of all color and fighting for survival.