(February 2013) Durham tubes are used in microbiology to detect production of gas by microorganisms. They are simply smaller test tubes inserted upside down in another test tube. This small tube is initially filled with the solution in which the microorganism is to be grown.
A compound predicate is two or more simple predicates joined by a conjunction that indicate actions by the same subject. Example : Bill picked up the mail and walked the dog.. Bill is the subject for both verbs.
What is a Compound Noun. Compound nouns are words for people, animals, places, things, or ideas, made up of two or more words. Most compound nouns are made with nouns that have been modified by adjectives or other nouns. In many compound nouns, the first word describes or modifies the second word, giving us insight into what kind of thing an item is, or providing us with clues about the itemâs purpose. The second word usually identifies the item. Compound nouns are sometimes one word, like toothpaste, haircut, or bedroom.