These structures have been installed and operated for a number of reasons: 1  locks allow navigation on large rivers to facilitate boating traffic. 2  weirs create pool environments for diversion into irrigation channels, for pump intakes, recreational boating and swimming, and other aesthetic reasons.
Medical Definition of carbohydrate. : any of various neutral compounds of carbon, hydrogen, and oxygen (as sugars, starches, and celluloses) most of which are formed by green plants and which constitute a major class of animal foods.
Types of carbohydrates. There are three main types of carbohydrates: 1  Sugar. 2  Sugar is the simplest form of carbohydrates. 3  Sugar occurs naturally in some foods, including fruits, vegetables, milk and milk products. 4  Sugars include fruit sugar (fructose), table sugar (sucrose) and milk sugar (lactose).5  Starch.ypes of carbohydrates. There are three main types of carbohydrates: 1  Sugar. 2  Sugar is the simplest form of carbohydrates. 3  Sugar occurs naturally in some foods, including fruits, vegetables, milk and milk products. 4  Sugars include fruit sugar (fructose), table sugar (sucrose) and milk sugar (lactose).