By producing oxygen as a byproduct of photosynthesis, cyanobacteria are thought to have converted the early oxygen-poor, reducing atmosphere, into an oxidizing one, causing the " rusting of the Earth " and the Great Oxygenation Event, that dramatically changed the composition of life forms and led to the near-extinction of anaerobic organisms.
32.
The preservationists want to determine if the glow, which they call an optical phenomenon caused by light passing through some areas more efficiently than others, is created by light scattered as a result of an inorganic reaction between the parchment and the glass, or if it is evidence of some type of anaerobic organism.
33.
Exposure to birds is associated with " Chlamydia psittaci "; farm animals with " Coxiella burnetti "; aspiration of stomach contents with anaerobic organisms; and cystic fibrosis with " Pseudomonas aeruginosa " and " Staphylococcus aureus " . " Streptococcus pneumoniae " is more common in the winter, and should be suspected in persons aspirating a large amount anaerobic organisms.
34.
Exposure to birds is associated with " Chlamydia psittaci "; farm animals with " Coxiella burnetti "; aspiration of stomach contents with anaerobic organisms; and cystic fibrosis with " Pseudomonas aeruginosa " and " Staphylococcus aureus " . " Streptococcus pneumoniae " is more common in the winter, and should be suspected in persons aspirating a large amount anaerobic organisms.
