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 : 1. Gram-positive cocci, arranged in pairs or chains. 2. Catalase negative. 3. Many are hemolytic (attack red blood cells). 4. Anaerobic, but tolerate the presence of oxygen (aerotolerant). 1  Non-motile.2  Often assembled according to serological properties (groupings A through H and K through V).TREPTOCOCCUS : 1. Gram-positive cocci, arranged in pairs or chains. 2. Catalase negative. 3. Many are hemolytic (attack red blood cells). 4. Anaerobic, but tolerate the presence of oxygen (aerotolerant). 1  Non-motile.