Collection Of Reference Dna Samples

In order to perform comparative DNA testing with evidence collected from a crime scene, biological samples must also be obtained from suspects or convicted felons (see Chapter 18). In addition, family reference samples are used in missing persons investigations, paternity testing, and mass disaster victim identifications (see Chapter 24). It is advantageous to obtain these reference DNA samples as rapidly and painlessly as possible. Thus, many laboratories often use buccal cell collection rather than drawing blood. Buccal cell collection involves wiping a cotton swab similar to a Q-tip against the inside cheek of an individual's mouth to collect some skin cells. The swab is then dried or can be pressed against a treated collection card to transfer epithelial cells for storage purposes.

A simple Buccal DNA Collector (Fox et al. 2002, Schumm et al. 2004) may also be used for direct collection of buccal cell samples. A disposable toothbrush can be used for collecting buccal cells in a non-threatening manner (Burgoyne 1997, Tanaka et al. 2000). This method can be very helpful when samples need to be collected from children. After the buccal cells have been collected by gently rubbing a wet toothbrush across the inner cheek, the brush can be tapped onto the surface of treated collection paper for sample storage and preservation.

Stuttering Simple Techniques to Help Control Your Stutter

Stuttering Simple Techniques to Help Control Your Stutter

Discover Simple Techniques to Help Control Your Stutter. Stuttering is annoying and embarrassing. If you or a member of your family stutters, you already know the impact it can have on your everyday life. Stuttering interferes with communication, and can make social situations very difficult. It can even be harmful to your school or business life.

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