The Hand Symbol-Meaning Native American symbols, like the hand symbol, are geometric portrayals of celestial bodies, natural phenomena and animal designs.Native Indian symbols were used for a variety of reasons and depicted on numerous objects such as tepees and clothing.and Symbol Meaning The next picture illustrates the use of the black hand symbol on the white horse. Black was used to symbolize victory and might be applied to the horse before returning home to the camp. Black Paint was made using ground charcoal, mixed with spit or animal fat, so it was readily available.
These tests detect the presence of disease-causing (pathogenic) Escherichia coli that produce Shiga toxins. E. coli bacteria commonly occur in nature and they are a necessary component of the digestive process in humans and most other mammals.
For the disease, see shigellosis. For the toxin that is produced by certain strains of Shigella and E. coli bacteria, see Shiga toxin. Shigella (/ÊÉªËÉ¡ÉlÉ/) is a genus of Gram-negative, facultative anaerobic, non-spore-forming, non-motile, rod-shaped bacteria closely related to Salmonella.The genus is named after Kiyoshi Shiga, who first discovered it in 1897.higella species are classified by four serogroups 1  : Serogroup A: S. dysenteriae (15 serotypes). 2  Serogroup B: S. flexneri (six serotypes). 3  Serogroup C: S. boydii (19 serotypes). 4  Serogroup D: S. sonnei (one serotype).