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.
Know the format. For citations in APA style, you'll embed a reference to your citation in the text, then include a reference list at the end of your essay. 2. Cite the website in the text.Directly after the sentence in which you reference the information from the website, add a in-text citation. 1  Use an open parenthesis after the last word. 2  APA style uses the author and date.now the format. For citations in APA style, you'll embed a reference to your citation in the text, then include a reference list at the end of your essay. 2. Cite the website in the text.