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Evidence of Rain Making Bacteria Found
For the research, Christner’s team examined precipitation from global locations and demonstrated that the most active ice nuclei – a substrate that enhances the formation of ice – are biological in origin.
This is important because the formation of ice in clouds is required for snow and most rainfall.
Though dust and soot particles can serve as ice nuclei, but biological ice nuclei are capable of catalyzing freezing at much warmer temperatures. If present in clouds, biological ice nuclei may affect the processes that trigger precipitation.
Cloud seeding with silver iodide or dry ice has been done for more than 60 years. Many ski resorts use a commercially available freeze-dried preparation of ice-nucleating bacteria to make snow when the temperature is just a few degrees below freezing.
But, the problem is that most known ice-nucleating bacteria are plant pathogens, which are basically germs that can cause freezing injury in plants, resulting in devastating economic effects on agricultural crop yields.
According to Christner, “As is often the case with bacterial pathogens, other phases of their life cycle are frequently ignored because of the focused interest in their role in plant or animal health.”
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