Approximately 80% of HIV diagnoses in the USA are among people who become infected through sexual exposure. Thus, of the approximately 40 000 new HIV infections each year in the US, 32 000 are sexual transmissions. Our results indicate that the HIV-positive unaware group contributes disproportionately to these new infections relative to their percentage of the HIV-positive population in the USA.
Dark red and blue-green indicate regions of high photosynthetic activity in the ocean and on land, respectively. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities (energy transformation).
Photosynthesis is the process that plants use to produce their own food. During photosynthesis plants use the energy from the sun to convert carbon dioxide from the air into sugar molecules. When they do this they consume water and also carbon dioxide, and they produce oxygen.