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.
The Harvard System requires two elements: in-text citations throughout your assignment, and a list of references at the end. 1. In-text citations. Include three pieces of information about a source within the text of your work:1  the name of the author or authors.2  the year of publication. 3  the page number (when the information/idea can be located on a particular page, or when directly quoted).n-text citations. Include three pieces of information about a source within the text of your work: 1  the name of the author or authors. 2  the year of publication. 3  the page number (when the information/idea can be located on a particular page, or when directly quoted).