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.
Quora User, Excel is my passion, with a vision that Excel CAN help improve simplify life. There's an easy way to find out: Clear up a column, any column. In that column, press Ctrl+Arrow Down, it will go all the way down to the bottom. Similar way if you want to know the farthest column to the right. Clear up a row, and press Ctrl+Arrow Right.