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.
Streptococcus pyogenes. Introduction. Streptococcus pyogenes is a gram positive bacteria. It is a cocci or sphere shaped bacterium that does not produce spores.It reproduces by asexual reproduction along a central axis creating either pairs of bacterium or long chains depending on culture media.he most common infection from Streptococcus pyogenes is impetigo, a superficial cutaneous infection common to children characterized by crusty legions and vesicles surrounded by a red border. Erysipelas-an acute infection and inflammation of the dermal layer of the skin.