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.
When you use information from sources, you need to tell the readers where the information came from and where the readers can locate the sources. This is what citations and references are for. A citation tells the readers where the information came from. In your writing, you cite or refer to the source of information.A reference gives the readers details about the source so that they have a good understanding of what kind of source it is and could find the source themselves if necessary. The references are typically listed at the end of the lab report. citation tells the readers where the information came from. In your writing, you cite or refer to the source of information. A reference gives the readers details about the source so that they have a good understanding of what kind of source it is and could find the source themselves if necessary.