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.
The picture above is a wonderful example of the Streptococcus pyogenes being gram-positive. A bacteria is gram-positive when it is a purple color after being stained. As you can see, the Streptococcus pyogenes is a gram-positive bacteria.It can also be seen that the bacteria has a coccoid shape and grows in chains.This picture is a perfect example of what Streptococcus pyogenes looks like when it is properly gram stained. bacteria is gram-positive when it is a purple color after being stained. As you can see, the Streptococcus pyogenes is a gram-positive bacteria. It can also be seen that the bacteria has a coccoid shape and grows in chains.