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.
In some instances, coral bleaching will result in corals. taking on a pastel shade of blue, yellow or pink rather. than turning bright white. This is due to proteins. produced by some corals,which tint the coral tissue and. become the dominant pigment during bleaching, when. zooxanthellae are absent110, 111.