Improperly canned or home-prepared foods are common sources of the toxin that can result in foodborne botulism. Wound botulism results from contamination of a wound with toxin-producing C botulinum. Foodborne botulism and wound botulism occur predominantly in adults and are the focus of this article.C botulinum is an anaerobic gram-positive rod that survives in soil and marine sediment by forming spores.mproperly canned or home-prepared foods are common sources of the toxin that can result in foodborne botulism. Wound botulism results from contamination of a wound with toxin-producing C botulinum. Foodborne botulism and wound botulism occur predominantly in adults and are the focus of this article.
Scientists can not find the exact age of fossils. They use radioactive measures estimates of sedimentation and index fossils to date other fossils. The closest scientists can come to an exact date for a fossil is Carbon 14 dating. However since Carbon 14 has a half life of about 5,600 years Carbon 14 dating can only be used to date very recent fossils.
Carbon-14 has a half-life of 5,730 years. Scientists determine the ages of once-living things by measuring the amount of carbon-14 in the material. For biological objects older than 50,000 years, scientists use radioactive dating to determine the age of rocks surrounding where the material was found. By dating rocks, scientists can approximate ages of very old fossils, bones and teeth. Radiocarbon dating was invented in the 1940s by Willard F. Libby.