Dna Sample Sources

DNA is present in every nucleated cell and is therefore present in biological materials left at crime scenes. DNA has been successfully isolated and analyzed from a variety of biological materials. Introduction of the polymerase chain reaction (PCR) has extended the range of possible DNA samples that can be successfully analyzed because many copies are made of the DNA markers to be examined (see Chapter 4). Some of the biological materials that have been tested with PCR-based DNA typing method are included in Table 3.1 (see also D.N.A. Box 3.1). The most common materials tested in forensic laboratories are blood and semen or bloodstains and semen stains.

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Stammering Its Cause and Its Cure

Stammering Its Cause and Its Cure

This book discusses the futility of curing stammering by common means. It traces various attempts at curing stammering in the past and how wasteful these attempt were, until he discovered a simple program to cure it. The book presents the life of Benjamin Nathaniel Bogue and his struggles with the handicap. Bogue devotes a great deal of text to explain the handicap of stammering, its effects on the body and psychology of the sufferer, and its cure.

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