The exudates from infected individuals contain many neutrophils with ingested gonococci. Bacteria feed on the exudates released by mycelium and colonize soil surrounding them. These changes are manifested in the retina as microaneurysms, hemorrhages, hard exudates, and cotton-wool spots. These exudates are decomposed primarily by bacteria. Bacterial species differ in their abilities to compete for carbon compound root exudates. Spores of Gigaspora margarita were grown in host plant exudates. Adults feed on flower nectar and other plant sap exudates. As the concentration of exudates was increased, the fungi produced more tightly clustered branches. Bark and plant exudates such as tree sap are consumed by a few lemur species. However, the rate of germination can be increased by host root exudates. Plants contribute to chemical weathering through root exudates. Presence of white exudates in esophagus is also suggestive of the diagnosis. Examples of natural aerosols are fog, mist, dust, forest exudates and geyser steam. Root exudates are another source of soil carbon. Additional sources of SOM include plant root exudates and charcoal.