Due to construction and functional characteristics above described, with the internal reflux column it is possible to get selective the separation of components of extremely complex mixtures, with similar chemico-physical characteristics, not economically separable otherwise.
Uniform numbers in American football are unusual compared to those in other sports. They are displayed in more locations on the uniform; they are universally worn on both the front and back of the jersey; and in many cases TV numbers are displayed on either the jersey sleeves, the shoulder pad, or occasionally on the helmets.
The goalkeeper is the only player who may use his or her hands to play the ball (although only within the penalty area). According to Rule 6.1 the goalkeeper is required to wear a jersey with a different color from either team's jersey color to avoid confusion for the referee.e also takes puckouts after a score or wide ball. A goal occurs when the ball passes through the goal; the attacking team is awarded 3 points. The goalkeeper has no special rules pertaining to him, although he still wears a different color jersey. Most goalkeepers use a special hurley with a wider bas (flat face).