An association football (soccer) match is presided over by a referee, whom the Laws of the Game give full authority to enforce the Laws of the Game in connection with the match to which he has been appointed (Law 5). The referee is oftentimes assisted by two assistant referees, and sometimes by a fourth official.
Barfoed's test. Barfoed's test is a chemical test used for detecting the presence of monosaccharides. It is based on the reduction of copper(II) acetate to copper(I) oxide (Cu2O), which forms a brick-red precipitate.
Purpose of the Renal Function Tests. 1  To evaluate kidney function and aid in the diagnosis of kidney disease. 2  To monitor the progression of renal insufficiency.  The BUN-to-creatinine ratio may aid in the evaluation of a personâs state of hydration.