Extending outwards from the core are the mantle and the crust. Earth's mantle extends to a depth of 2,890 km beneath the surface, making it the thickest layer of Earth. This layer is composed of silicate rocks that are rich in iron and magnesium relative to the overlying crust.
The Parasite: Balantidium coli. Balantidium coli is the only ciliate known to parasitize humans. Ciliates represent a phylum of protozoa characterized, in at least one stage of development, by simple or compound ciliary organelles on the surface of their membranes that are used for locomotion.
Balanitis. Balanitis is an inflammation of the glans (balanus), but is not necessarily an infection. Balanitis may occur together with posthitis (inflammation of the foreskin), when it is known as balanoposthitis. Balanitis xerotica obliterans (BXO) is a separate and distinct condition.he sub-preputial moisture contains lysozyme-an antibacterial enzyme-which may be protective against infective organisms. The sub-preputial moisture also contains secretions from sebaceous glands that moisturize, lubricate, and protect the mucosa of the glans penis. Zoon's plasma cell balanitis.