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By Al Adcock, Don Greer

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Breslauer KJ, Freire E, Straume M (1992) Calorimetry: a tool for DNA and ligand-DNA studies. Methods Enzymol 211:533–567 8. Puglisi JD, Tinoco I Jr (1989) Absorbance melting curves of RNA. Methods Enzymol 180:304–325 9. Šponer J, Leszczynski J, Hobza P (2001) Electronic properties, hydrogen bonding, stacking, and cation biding of DNA and RNA bases. Biopolymers 61(1):3–31 10. Seeman NC (2007) An overview of structural DNA nanotechnoloy. Mol Biotechnol 37:246–257 11. Guo P (2010) The emerging field of RNA nanotechnology.

Frequently, this material is made of cotton and the brand Q-tip™ is one such highly recognized and marketed cotton swab to consumers. However, swab tips are also made with Fig. 1 Swab (left) and Flocked Swab variety (right) 3 Sampling of Microbiological Samples 27 Fig. 2 Cotton swab is being used to sample microbes in a clean room environment polyurethane, polyester, nylon, and various mixes of different fibers. These swabs can also be dry or pre-wetted with a buffer such as buffered peptone water, and either sterile or non-sterile.

The microbes and particulates in the air are then collected on to the agar surface. These sedimentation plates can be left out for minutes to hours depending on the sampling protocol. It should be noted that the collection of microbes and other particulates in the air happens by chance, and depends on particle size, wind speed, and directional influence during the time the agar surface is left exposed to the air [21, 22]. 10 Impaction/Impingement This method is similar to gravitational settling on petri plates, except that a jet draws air onto the agar surface.

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