Age of Menarche. Menarche marks the commencement of the reproductive phase of a woman's life. Records suggest that there was a secular decline in the average age at menarche in developed countries across the 19th and 20th Centuries until the 1950s, with an average age at menarche of 15-17 years reported in the mid-19th Century.
CHARACTERISTICS: Streptococcus pyogenes is an aerobic, gram-positive extracellular bacterium. It is made up of non-motile, non-sporing cocci that are less then 2 Âµm in length and that form chains and large colonies greater then 0.5 mm in size.HARACTERISTICS: Streptococcus pyogenes is an aerobic, gram-positive extracellular bacterium. It is made up of non-motile, non-sporing cocci that are less then 2 Âµm in length and that form chains and large colonies greater then 0.5 mm in size.
Enterobacter Aerogenes. Enterobacter aerogenes, part of the Enterobacteriaceae Family, is a rod-shaped bacteria that causes bacterial infections, and is usually acquired in a hospital or hospital-type atmospheres.hese become âdrug resistant bacteriaâ or âsuperbugs.â. Enterobacter aerogenes are small, white in color, and have flagella surrounding it making it motile. It is Gram-negative and anaerobic. They are seen throughout nature, including fresh water, sewage plants, and vegetables.