(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.
In English grammar, a compound sentence is a sentence that contains at least two independent clauses. A compound sentence can be thought of as two (or more) simple sentences joined by a conjunction and/or an appropriate mark of punctuation. (3) on occasion, using a colon. The compound sentence is one of the four basic sentence structures. The other structures are the simple sentence, the complex sentence, and the compound-complex sentence.