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.
Citation Styles Tags: citation management. Learn how to cite articles, books, reports, theses, legal documents, and more using citation styles like APA, Chicago, and IEEE. Last Updated: Oct 1, 2015 URL: http://libguides.nps.edu/citation Print Guide. In-text citations may be given as (Author, date) or Author (date), with all or only some of the information in parentheses. 2  Include the page number if you have it. 3  Date will be year only with the exception of personal communications.