Thixotropic gel is an inert (nonreacting) synthetic substance in the bottom of certain tubes. When a specimen in a gel tube is centrifuged the gel undergoes a change in viscosity and moves to a position between the cells and the serum or plasma, forming a physical barrier between them. This separation prevents the cells from continuing to metabolize substances such as glucose in the serum or plasma.
Placement of Citations. 1  Place a citation as close to the quoted or paraphrased material as possible without disrupting the sentence. 2  When material from one source and the same page numbers is used throughout a paragraph, use one citation at the end of the paragraph rather than a citation at the end of each sentence.
Citing an Annual Report Within a Text. 1  1. Place in-text citations before end punctuation, enclosed in parentheses. There are many ways to cite your information within a text depending on the citation style, including footnotes or merely an author's last name. 2  2. Place the company's name, date, and page number in parentheses.