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.
Have the citation make it easy to find the reference in the References section. All references in that section should be complete enough for readers to obtain a copy for themselves. 4. Your List of References. Create a list of references, one for each item cited in the paper, in a section called References. This section goes at the end of your paper. The references are to be alphabetized by the fist author's last name, or (if no author is listed) the organization or title. If you cite more than one paper by the same first author, sort them by year of publication, earliest year first. Do not use footnotes for citations.