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Decomposition or rot is the process by which dead organic substances are broken down into simpler organic or inorganic matter such as carbon dioxide, water, simple sugars and mineral salts. The process is a part of the nutrient cycle and is essential for recycling the finite matter that occupies physical space in the biosphere. Bodies of living organisms begin to decompose shortly after death. Animals, such as earthworms, also help decompose the organic materials. Organisms that do this are known as decomposers or detritivores. Although no two organisms decompose in the same way, they all undergo the same sequential stages of decomposition. The science which studies decomposition is generally referred to as taphonomy from the Greek word taphos, meaning tomb. Decomposition can also be a gradual process for organisms that have extended periods of dormancy.
Putrefaction is the fifth stage of death, following pallor mortis, livor mortis, algor mortis, and rigor mortis. This process references the breaking down of a body of an animal post-mortem. In broad terms, it can be viewed as the decomposition of proteins, and the eventual breakdown of the cohesiveness between tissues, and the liquefaction of most organs. This is caused by the decomposition of organic matter by bacterial or fungal digestion, which causes the release of gases that infiltrate the body's tissues, and leads to the deterioration of the tissues and organs. The approximate time it takes putrefaction to occur is dependent on various factors. Internal factors that affect the rate of putrefaction include the age at which death has occurred, the overall structure and condition of the body, the cause of death, and external injuries arising before or after death. External factors include environmental temperature, moisture and air exposure, clothing, burial factors, and light exposure. Body farms are facilities that study the way various factors affect the putrefaction process.
Forensic anthropology is the application of the anatomical science of anthropology and its various subfields, including forensic archaeology and forensic taphonomy, in a legal setting. A forensic anthropologist can assist in the identification of deceased individuals whose remains are decomposed, burned, mutilated or otherwise unrecognizable, as might happen in a plane crash. Forensic anthropologists are also instrumental in the investigation and documentation of genocide and mass graves. Along with forensic pathologists, forensic dentists, and homicide investigators, forensic anthropologists commonly testify in court as expert witnesses. Using physical markers present on a skeleton, a forensic anthropologist can potentially determine a person's age, sex, stature, and race. In addition to identifying physical characteristics of the individual, forensic anthropologists can use skeletal abnormalities to potentially determine cause of death, past trauma such as broken bones or medical procedures, as well as diseases such as bone cancer.
A body farm is a research facility where decomposition of humans and other animals can be studied in a variety of settings. The initial facility was conceived by anthropologist William M. Bass in 1981 at the University of Tennessee in Knoxville, Tennessee, where Bass was interested in studying the decomposition of a human corpse from the time of death to the time of decay. The aim was to gain a better understanding of the decomposition process, permitting the development of techniques for extracting information such as the timing and circumstances of death from human remains. Body farm research is of particular interest in forensic anthropology and related disciplines, and has applications in the fields of law enforcement and forensic science. By placing the bodies outside to face the elements, researchers are able to get a better understanding of the decomposition process.
The post-mortem interval (PMI) is the time that has elapsed since an individual's death. When the time of death is not known, the interval may be estimated, and so an approximate time of death established. Postmortem interval estimations can range from hours, to days or even years depending on the type of evidence present. There are standard medical and scientific techniques supporting such an estimation.
A detection dog or sniffer dog is a dog that is trained to use its senses to detect substances such as explosives, illegal drugs, wildlife scat, currency, blood, and contraband electronics such as illicit mobile phones. The sense most used by detection dogs is smell. Hunting dogs that search for game, and search and rescue dogs that work to find missing humans are generally not considered detection dogs but instead under their own categories. There is some overlap, as in the case of cadaver dogs, trained to search for human remains.
William Marvin Bass III is an American forensic anthropologist, best known for his research on human osteology and human decomposition. He has also assisted federal, local, and non-U.S. authorities in the identification of human remains. He taught at the University of Tennessee in Knoxville, and founded the University of Tennessee Anthropological Research Facility, the first such facility in the world. The facility is more popularly known as "The Body Farm", a name used by crime author Patricia Cornwell in a novel of the same name, which drew inspiration from Bass and his work. Bass has also described the body farm as "Death's Acre" – the title of the book on his life and career, co-written with journalist Jon Jefferson. Jefferson and Bass, under the pen name "Jefferson Bass", have also written several fictional works: Carved In Bone, Flesh and Bone, The Devil's Bones, Bones of Betrayal, The Bone Thief, The Bone Yard, The Inquisitor's Key, Cut To the Bone, and The Breaking Point. Though currently retired from teaching, Bass still plays an active research role in the university's forensic anthropology program.
A search-and-rescue dog is one trained to find missing people after a natural or man-made disaster. The dogs detect human scent and have been known to find people under water, under snow, and under collapsed buildings.
Kristen Deborah Modafferi is an American woman who, at the age of 18, in the early summer of 1997, disappeared in mysterious circumstances after leaving her work at the Crocker Galleria Mall in San Francisco, California. The soon-to-be college sophomore at North Carolina State University was spending the summer in the Bay Area; Modafferi had relocated from her native North Carolina to Oakland only recently and was expected to start summer photography classes at UC Berkeley on the day after she vanished.
Skeletonization is the state of a dead organism after undergoing decomposition. Skeletonization refers to the final stage of decomposition, during which the last vestiges of the soft tissues of a corpse or carcass have decayed or dried to the point that the skeleton is exposed. By the end of the skeletonization process, all soft tissue will have been eliminated, leaving only disarticulated bones.
Forensic entomological decomposition is how insects decompose and what that means for timing and information in criminal investigations. Medicolegal entomology is a branch of forensic entomology that applies the study of insects to criminal investigations, and is commonly used in death investigations for estimating the post-mortem interval (PMI). One method of obtaining this estimate uses the time and pattern of arthropod colonization. This method will provide an estimation of the period of insect activity, which may or may not correlate exactly with the time of death. While insect successional data may not provide as accurate an estimate during the early stages of decomposition as developmental data, it is applicable for later decompositional stages and can be accurate for periods up to a few years.
The University of Tennessee Anthropological Research Facility, better known as the Body Farm and sometimes seen as the Forensic Anthropology Facility, was conceived in 1971 and established in 1972 by anthropologist William M. Bass as the first facility for the study of decomposition of human remains. It is located a few miles from downtown Knoxville, Tennessee, United States, behind the University of Tennessee Medical Center, and is part of the Forensic Anthropology Center, which was established by Dr. Bass in 1987.
Body identification is a subfield of forensic science that uses a variety of scientific and non-scientific methods to identify a body. Forensic purposes are served by rigorous scientific forensic identification techniques, but these are generally preceded by formal identification. This involves requesting a family member or friend of the victim to visually identify the body.
Microbiology of decomposition is the study of all microorganisms involved in decomposition, the chemical and physical processes during which organic matter is broken down and reduced to its original elements.
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Decomposition in animals is a process that begins immediately after death and involves the destruction of soft tissue, leaving behind skeletonized remains. The chemical process of decomposition is complex and involves the breakdown of soft tissue, as the body passes through the sequential stages of decomposition. Autolysis and putrefaction also play major roles in the disintegration of cells and tissues.
The smell of death is a smell occurring during decomposition. It is made up of over 800 different chemicals. There have been efforts to synthesize the smell of death. It has also been used as evidence in court trials involving murder.
The necrobiome has been defined as the community of species associated with decaying corpse remains. The process of decomposition is complex. Microbes decompose cadavers, but other organisms including fungi, nematodes, insects, and larger scavenger animals also contribute. Once the immune system is no longer active, microbes colonizing the intestines and lungs decompose their respective tissues and then travel throughout the body via the blood and lymphatic systems to break down other tissue and bone. During this process, gases are released as a by-product and accumulate, causing bloating. Eventually, the gases seep through the body's wounds and natural openings, providing a way for some microbes to exit from the inside of the cadaver and inhabit the outside. The microbial communities colonizing the internal organs of a cadaver are referred to as the thanatomicrobiome. The region outside of the cadaver that is exposed to the external environment is referred to as the epinecrotic portion of the necrobiome, and is especially important when determining the time and location of death for an individual. Different microbes play specific roles during each stage of the decomposition process. The microbes that will colonize the cadaver and the rate of their activity are determined by the cadaver itself and the cadaver's surrounding environmental conditions.
Professor Shari L. Forbes is an Australian and Canadian forensic scientist and researcher. She is a thanatology expert on the decomposition of human bodies. She created a body farm in Australia and between 2019 and 2022 established a similar facility in Canada, connected to the Forensic Science department at Université du Québec à Trois-Rivières (UQTR). As of January 2023, she is a full professor in chemistry and biochemistry at the University of Windsor, and is hoping to start the first body farm in Ontario in the coming years.
The stages of death of a human being have medical, biochemical and legal aspects. The term taphonomy from palaeontology applies to the fate of all kinds of remains of organisms. Forensic taphonomy is concerned with remains of the human body.
References
- 1 2 3 4 5 Vass, Arpad A (August 1991). Time Since Death Determinations of Human Cadavers Utilizing Soil Solution (PDF) (Ph.D. thesis). University of Tennessee, Knoxville. OCLC 25539141. Archived from the original (PDF) on 2012-03-26. Retrieved 2011-06-22.
- ↑ Robertson, Susan (Spring 2018). "Hands On". Tennessee Alumnus. 98 (2): 35.
- ↑ Smirnov, Alexei (March 2004). "Top Ten Scientists". Business TN (100). Archived from the original on July 8, 2011. Retrieved June 20, 2011.
- ↑ Costner, Robert (April 10, 2003). "Lunch/lecture by Arpad Vass". Fornlist (Mailing list). Archived from the original on July 16, 2011.
- ↑ "Uncovering The Evidence". Review. Oak Ridge National Laboratory. 37 (1): 19. 2004. ISSN 0048-1262. Archived from the original on August 31, 2010. Retrieved July 5, 2008.
- ↑ Vass, Arpad A; et al. (November 14, 2003). "Decompositional Odor Analysis Database - Phase 1" (PDF). ORNL.gov. Archived from the original (PDF) on May 24, 2011. Retrieved July 5, 2008.
- ↑ Goforth, Sarah (December 16, 2003). "Bodies and Bones: Where the bodies are". WhyFiles.org. Archived from the original on July 4, 2010.
- ↑ Sachs, Jessica Snyder (January 7, 2003). "New Science for the Murder Victim Search". Popular Science. Archived from the original on May 23, 2011.
- ↑ https://forensicdnaexperts.com/about/