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.
Some examples of facultative anaerobic bacteria are the Staphylococci (Gram positive), Escherichia coli (Gram negative), Corynebacterium (Gram positive), and Listeria (Gram positive). Organisms in the Kingdom Fungi can also be facultative anaerobic, such as yeasts.Word origin: an-from Gk., not, without, + Greek Äero -, from ÄÄr, air. Compare: obligate anaerobe. See also: facultative anaerobe, microaerophile, aerotolerant.rganisms in the Kingdom Fungi can also be facultative anaerobic, such as yeasts. Word origin: an-from Gk., not, without, + Greek Äero -, from ÄÄr, air. Compare: obligate anaerobe. See also: facultative anaerobe, microaerophile, aerotolerant.