The word complement means "something that completes." (That's why it's spelled complement,as opposed to compliment, a favorable comment.) In geometry, the complement is the angle needed to complete a right angle. Thus,
90° - known quantity = complement
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To find the complement of an angle, subtract the angle's measurement from 90 degrees. The sum of the angle and its complement will equal 90 degrees.
There are two types of complements:a subject complement, a noun or a pronoun that follows a linking verb, renaming or restating the subject of the sentence.an object complement, a noun that follows and modifies or refers to a direct object.Examples:Jack was a spelling bee champion. (subject complement, Jack = champion)The flowers are for my sister, Jill. (object complement, sister = Jill)The person he asked for was you. (subject complement, person = you)A subject complement can also be an adjective, also called predicate adjective.Example: Jack was so happy. (Jack = happy)
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The principle of complement-fixation test involves the detection of antibodies by measuring the ability of a patient's serum to fix and consume complement in the presence of a specific antigen. If antibodies are present in the sample, they will fix complement, leading to a decrease in complement activity that can be detected. This test is often used to diagnose infections such as syphilis and certain viral diseases.
Factor B is the key complement protein that helps activate the alternative pathway of complement activation. It forms a complex with Factor D and is cleaved by Factor D to produce the active fragment, which leads to further activation of the alternative pathway.
A sentence may have no complement at all.A complement is a noun (or adjective) that follows a linking verb and renames the subject, a subject complement.When the noun (or adjective) follows the direct object and it tells what the direct object has become, it is the object complement.If you are not using a linking verb and you are not describing the object of the verb, the sentence has no complement.