Forensic Entomology
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This document discusses the use of insects in estimating time of death and their role in forensic investigations. It begins by outlining the history of forensic entomology from its discoveries in the 17th century. Different types of insects, like flies and beetles, arrive at a body at different times post-mortem and under varying environmental conditions, allowing investigators to estimate time since death. Proper collection and documentation of insect evidence is also discussed. The document concludes by noting the diversity of contexts in which forensic entomology can provide insights, such as cases of abuse, accidents, or toxicology.
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Similar to Forensic Entomology
Presentation11
Forensic entomology uses insects and other arthropods found on decomposing human remains to estimate the minimum time since death in legal investigations. The age of the oldest insects present provides a minimum estimate, as the body cannot have been dead for longer than it took the insects to arrive and develop. For example, blowfly larvae found on a burned body in England indicated death occurred at least six days before discovery, consistent with witness testimony of a fatal fire.
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This document provides an overview of forensic entomology and how insects can aid in legal investigations. It discusses how forensic entomologists can use insect evidence found on a corpse to estimate the postmortem interval (PMI), or time since death. Key insects like flies in the orders Diptera and beetles in the Coleoptera arrive in predictable waves and their development rates can help estimate the PMI. Other topics covered include the ecology of decomposition, the five stages of decomposition, and how environmental factors affect decay rates.
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Forensic Entomology
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Forensic Entomology
Forensic entomology is the study of bugs in the criminal justice field in order to determine the post mortem interval (PMI). The post mortem interval refers to the time between a person dies and the body of the deceased is located. In criminal cases understanding when a person died can point to suspect or causes suspects in the case to be discarded. When a person dies bugs will be immediately be attracted to the decaying body. There are many factors that can affect the rate of decomposition affecting the PMI. The lifespan of these bugs as well as their activity provides reliable information on time of death.
The blowfly is an important insect for determining the post mortem interval. The lifecycle of the blowfly located in the decomposing body can point to how long the person has been dead. Once a person dies blow flies will immediately begin to feed of the body and lay their eggs in moist areas where their eggs will thrive. The blow fly will lay up to 250 eggs in the moist opening. The eggs will look like little small white sausages that are all laid together in clumps. These eggs will hatch within twenty four hours after being laid by the blow fly. Once the blowfly hatches it becomes larvae.
After hatching, the larvae will undergo three stages of development, lasting a combined total of 7 to 10 days (Smith, 2011).The newly hatched larvae (maggots) are in the first stage. The maggots become longer and more elongated shaped. The maggot has small hooks by the mouth that help them move or to latch on the corpse and feed. These shape and size of hooks will help determine the type of fly. Theses maggots will feed until they become second stage maggots.
A part of this process is to leave the moist area on the decaying body finding a dryer place in which to turn to pupae. This is the third stage of the maggot. The pupae are different from the other maggot forms because a harder outer shell develops. During this process the actual insect takes form within the pupae developing legs and wings. This fly is completely white until the pupae splits revealing the blow fly. When looking for pupae many are found around the body and not directly on the body due to the fact they need a dry place in which to mature. The temperature and moisture can affect the length of each stage of the blowfly development.
The number of eggs laid by blowflies can result in large masses of maggots in the body which in turn can affect the body temperature of the body. When determining time of death the temperature of the body plays an important role if the death is relatively soon before locating the body. Masses of third-stage maggots may produce heat, which can raise the temperature around them more than 10° C. (Smith, 2011). Overtime the pupae will open and a full grown blow fly will emerge from the shell.
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Forensic science is the application of science to address legal matters. It involves using various scientific techniques to analyze evidence found at crime scenes. Some key areas of forensic science include analyzing fingerprints, DNA, ballistics, toxicology, pathology, entomology, questioned documents, and trace evidence. The goal is to apply scientific processes and reasoning to help determine exactly what happened in criminal cases.
insect morphology in forensic entomology with suitable examples
This document provides an overview of the role of insect morphology in forensic entomology. It discusses how the study of insects and their development on decomposing bodies can help estimate time of death and associate suspects with crime scenes. Key insect orders that are studied include Diptera (flies) and Coleoptera (beetles). By identifying insects and their life stages found on a body, investigators can determine postmortem interval, or time since death. The morphology and DNA analysis of insect larvae are especially important for forensic analysis.
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The document discusses several historical theories about the origins of life:
1) Special creation theory proposes that all life was supernaturally created by God within a short period.
2) Spontaneous generation theory proposed that life could arise spontaneously from non-living matter, an idea that was disproven by experiments in the 17th-19th centuries.
3) Panspermia theory suggests that life originated elsewhere in the universe and was seeded on Earth via meteors or cosmic dust, but this does not fully explain the first origins of life.
Forensic Anthropology Case Study
The student describes their involvement in Science Olympiad and how it has impacted their learning and development. They were initially skeptical to join but became enthralled after attending their first meeting. Through competing in various events over multiple years, they gained knowledge in topics like human anatomy, entomology, and experimental design. They learned skills like memorization, utilizing the scientific method, and conducting experiments. The student found success with the team, winning various competitions at the regional and state level and qualifying for nationals. Their participation in Science Olympiad has helped shape their passion for the natural sciences and improved their academic and life skills.
ENTAMOLOGY DETERMINATION OF DEATH OF PERSON BY INSECT LIFE CYCLE
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FORENSIC SCIENCE.pptx
Forensic Science , Law, DNA, Finger Impression, Hair, Blood, Evidence, Scientific Evidence, Supreme court, lab,
1.5. - The origin of cells
1. The origin of the first cells on Earth is still not fully known, but they likely arose through natural processes from non-living matter around 3.8 billion years ago.
2. Early atmospheric conditions and lightning may have produced simple organic molecules, while hydrothermal vents could have provided energy for assembling polymers.
3. The development of cell membranes around 1.9 billion years ago was a major advance, allowing compartmentalization within lipid vesicles.
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The document provides an overview of the history and development of forensic science. It discusses how Sir Arthur Conan Doyle and his Sherlock Holmes series introduced many forensic science techniques. It also describes the contributions of Hans Gross who detailed the application of various sciences to criminal investigations, and Edmond Locard who established the first crime laboratory and developed Locard's exchange principle. The document outlines the basic units of a crime laboratory and discusses judicial standards for the admissibility of forensic evidence in court.
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Case Study Casey Anthony
The document discusses three methods used by forensic scientists to determine time of death: forensic entomology examines insect evidence on a body to estimate post-mortem interval, algor mortis analyzes body cooling to determine time since death, and rigor mortis observes muscle stiffening to identify a timeframe. These techniques were prominently featured in television shows about forensic analysts solving crimes by precisely calculating the time and manner of death.
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insect morphology in forensic entomology with suitable examples
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Forensic Entomology
- 1. By: Ashley Straniero & Shaun Connolly
- 2. From the Beginning… First discovered by Francesco Redi (17th Century) Exposed vs. Unexposed Meat Spontaneous Generation Theory
- 3. Insects at the Crime Scene Flies vs. Beetles Blow Flies and Flesh Flies are first to inhabit a body (Calliphoridae and Sarcophagidae) (Sexton beetle)
- 4. Weather and Observations of Body Sun vs. Shade Position of Body Inside vs. Outside Maggot Mass Temperature Air Temperature Soil Temperature
- 5. Collection of Bugs First appeared bugs are captured first (very fast retrievers) Ethyl Acetate to immobilize bugs (75%) Properly label bugs (graphite only)
- 6. Estimating Time of Death PMI (Post Mortem Interval) Identifying types of species of insects – Rate of development Tampering with the results: season, temperature, sun exposure, etc.
- 7. Sequence of Insect Arrival 1st Responders=Blow Flies which are attracted to the foul odor (several hours after death) 2nd Responders=Flesh Flies appear directly after or at the same time as Blow Flies Under certain weather conditions, the Flesh Fly will appear first since they can fly during rainfall.
- 9. Diversity of Forensic Entomology -Child Abuse -Elderly Abuse -Animal Abuse -Car Accidents
- 11. Entomotoxicology
- 12. Work Cited Briscoe, T. S. (n.d.). Crime and Forensic Blog | The National Museum of Crime and Punishment. Washington D.C. Museum - Crime Museum. Retrieved April 1, 2013, from http://www.crimemuseum.org/blog/category/forensic-science/ Champion, D. J. (n.d.). The American Dictionary Of Criminal Justice: Key Terms And Major Court Cases - Dean J. Champion - Google Books. Google Books. Retrieved April 1, 2013, from http://books.google.com/books?id=w5_jF7YIPzYC&pg=PA104&lpg=PA104&dq=en tomological+evidence+proves+elder+abuse&source=bl&ots=32UWci- cQs&sig=qzramZxRDL6dGWcuV6-7hXrtA3U&hl=en&sa=X&ei=49BZUfe- D6ns0gGB_YBI&ved=0CFoQ6AEwBA#v=onepage&q=entomological%20evidence% Domain Names, Web Hosting and Online Marketing Services | Network Solutions. (n.d.). Domain Names, Web Hosting and Online Marketing Services | Network Solutions. Retrieved April 1, 2013, from http://www.forensic-ent.com/ Entomotoxicology | DeepDyve. (n.d.). DeepDyve - The simplest way to get the articles you need. Retrieved April 1, 2013, from http://www.deepdyve.com/lp/elsevier/entomotoxicology-eZP2FeeYG7/1 Forensic entomology. (n.d.). Forensic entomology. Retrieved April 1, 2013, from http://www.forensicentomology.com/definition.htm