Abstract: Bacteria which produce freezing nuclei active at temperatures warmer than ?10°C have been isolated from leaves, water and snow. Those which produce freezing nuclei active at the warmest temperatures include strains of P. ...

Abstract: Transient appearance of ice nuclei active at temperatures of ?2 to ?5°C has been noted to accompany the natural decay of plant leaf materials. It was shown that the development of these nuclei results from the presence of ...