Results. 1  A total of 417 freediving accident cases were captured; 308 fatal and 109 non-fatal. 2  51Â±9 (40-63) fatal cases annually (Figure 1). 3  Incidents were reported from 56 countries. 4  46% in America; 11% in Australia; and single digits elsewhere. 5  Freediving victims were 41Â±17 (5-93) years of age (92% known) (Figure 2).
All of the DNA found in an organism is collectively referred to as the genome. The human genome is comprised of 23 pairs of linear chromosomes, and approximately 3000 megabases (Mb) of DNA, while thegenome of the bacterium Escherichia coli consists of a single 4.6 Mb circular chromosome.
Furthermore, some bacteria have linear chromosomes. Borrelia 3 have linear chromosomes and most strains contain both linear and circular plasmids; most of the bacteria in the genus Streptomyces 4 have linear chromosomes and plasmids and some have circular plasmids as well. For example, linear DNA was precipitated in the most commonly used procedures for purifying bacterial plasmids, and the procedures for purifying chromosomal DNA relied upon the differential binding of ethidium bromide to sheared DNA fragments compared to circular DNA.