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.
ï· In the header, add consecutive page numbers to the upper right hand corner. In Text Citations. When you quote or paraphrase from a source (book, article, etc.), you need give credit to that source by. inserting a citation. This citation typically consists of the authorâs name and page number in parentheses.