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.
In a gram stain, the Streptococcus pyogenes will be a purple color, indicating that it is a gram positive bacteria. The class Bacilli is a classification of cocci or rod shaped bacteria, and that is what the Streptococcus pyogenes are. Lactobacillales are an order of the gram positive bacteria comprising the lactic acid bacteria. Streptococcus pygenes produces lactic acid, so it is therefore classified under the lactobacillales. Streptococcaceae are gram positive non-sporulating bacteria including many parasitic, pathogenic and saprophytic forms.