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.
Placing Your References In-Text. 1  1. Place a reference next to each statement that you've cited. 2  2. Place an MLA reference. 3  3. Use Turabian footnotes.  4. Place an APA 1  reference. 5. Use the CSE Citation-Sequence.  6. Use CSE Name- 1 Year. 7. Cite in Chicago Manual of 2  Style. 8. Use Legal/Blue Book format for citations in legal documents.