Aérobiologie

Aerobiology (from Greek ἀήρ, aēr, "air"; βίος, bios, "life"; and -λογία, -logia) is a branch of biology that studies the passive transport of organic particles, such as bacteria, fungal spores, very small insects, pollen grains and viruses. Aerobiologists have traditionally been involved in the measurement and reporting of airborne pollen and fungal spores as a service to those with allergies. However, aerobiology is a varied field, relating to environmental science, plant science, meteorology, phenology, and climate change. The first mention of "aerobiology" was made by Fred Campbell Meier in the 1930s. The particles, which can be described as Aeroplankton, generally range in size from nanometers to micrometers which makes them challenging to detect. Aerosolization is the process of a small and light particles becoming suspended in moving air. Now bioaerosols, these pollen and fungal spores can be transported across an ocean, or even travel around the globe. Due to the high quantities of microbes and the ease of dispersion, Martinus Beijerinck once said "Everything is everywhere, the environment selects". This means that aeroplankton are everywhere and have been everywhere, and it solely depends on environmental factors to determine which remain. Aeroplankton are found in significant quantities even in the Atmospheric boundary layer (ABL). The effects on climate and cloud chemistry of these atmospheric populations is still under review. NASA and other research agencies are studying how long these bioaerosols can remain afloat and how they can survive in such extreme climates. The conditions of the upper atmosphere are similar to the climate on Mars' surface, and the microbes found are helping redefine the conditions which can support life. The process of dispersal of aerobiological particles has 3 steps: removal from source, dispersion through air, and deposition to rest. The particle geometry and environment affect all three phases, however once it is aerosolized, its fate depends on the laws of physics governing the motion of the air.