World's Largest Sitka Spruce Tree. A celebrated Sitka spruce (Picea sitchensis) on Klootchy Creek near Seaside, Oregon, receives so many visitors that recently a $50,000 boardwalk was constructed to preserve its roots from compaction. It is perhaps 700 years old, and truly amazing in stature.
Bacteriocins are antibacterial proteins produced by bacteria that kill or inhibit the growth of other bacteria. Many lactic acid bacteria (LAB) produce a high diversity of different bacteriocins. Though these bacteriocins are produced by LAB found in numerous fermented and non-fermented foods, nisin is currently the only bacteriocin widely used as a food preservative.
Since bacteriocins are isolated from foods such as meat and dairy products, which normally contain lactic acid bacteria (Table 3), they have unknowingly been consumed for centuries. A study of 40 wild-type strains of Lactococcus lactis showed that 35 produced nisin (Hurst, 1981).