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.
By comparing the ratio of parent isotopes to daughter isotopes, scientists are able to determine the age of the fossil and the rock. Isotopes that have long half-lives are necessary to date fossils because many fossils are millions of years old. Uranium-235 is used quite often in the absolute dating of fossils.Uranium-235 has a half-life of 704 million years. Therefore, Uranium-235 can be used to accurately date rocks that are hundreds of million years old. Many people are under the misconception that carbon-14 is used for dating of fossils.Carbon-14 has a half life of 5,730 years, which is too short to be useful in dating fossils.herefore, Uranium-235 can be used to accurately date rocks that are hundreds of million years old. Many people are under the misconception that carbon-14 is used for dating of fossils. Carbon-14 has a half life of 5,730 years, which is too short to be useful in dating fossils.