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Saint-André-lez-Lille, France

Broucker A.D.,University Of Lille F 59000 Lille | Colard T.,University Of Lille F 59000 Lille | Colard T.,Forensic Taphonomy Unit | Penel G.,University Of Lille F 59000 Lille | And 2 more authors.
International Journal of Paleopathology | Year: 2015

Estimating an individual's age at death is essential for post-mortem identification, paleopathology and paleodemography. With substantial development over the past 10 years in cementochronology analyses, some concerns have arisen that oral pathological conditions may artificially reduce or increase cementum apposition.The objective of this study was to observed the impact of periodontal disease on acellular cementum and on the reliability of cementochronology to test its accuracy for estimating individual age at death. The study included 41 teeth presenting different degrees of bone destruction, extracted from 18 individuals affected by untreated periodontal disease.The results demonstrated that the degree of alveolysis had only limited effects on the counting of cementum annulations in the middle (rp = 0.92,. p <. 0.01 between estimated and civil age) and the cervical (rp = 0.85,. p <. 0.01) thirds of the root, whereas in the apical third, the increments were affected considerably. This cementum reactive process compensates for bone destruction and loss of the attachment apparatus. These data suggest that cementum could continue to grow at a slower rate despite bone destruction due to periodontal disease. Cementochronology can thus be applied to teeth with a damaged periodontium by sectioning the middle third of the root. © 2015 Elsevier Inc. Source


Charabidze D.,University of Lille Nord de France | Charabidze D.,Forensic Taphonomy Unit
Annales de la Societe Entomologique de France | Year: 2012

Necrophagous insects and forensic entomology. The estimation of the time of death is one of the major issues when a body is discovered. For this purpose, forensic entomology use insects sampled on corpses to estimate a minimum post-mortem interval (PMImin) and the time of death. This field of forensic sciences and legal medicine thus needs detailed knowledge regarding the development and physiology of the species of forensic interest. Such knowledge is provided by constant research in field and laboratory conditions. The goal of these studies is not only to develop new methods for PMI estimation improvement. Forensic entomology research also allows a better comprehension of several areas of the biology of necrophagous species. This review presents on a fi rst part the development of necrophagous species, and especially blowfl ies larvae (Diptera Calliphoridae). In a second part, the current concepts in forensic entomology allowing PMI estimation are explained. © Société Entomologique de France. Source


Colard T.,Lille University of Science and Technology | Colard T.,Forensic Taphonomy Unit | Delannoy Y.,Lille University of Science and Technology | Delannoy Y.,Forensic Taphonomy Unit | And 6 more authors.
Journal of Forensic Sciences | Year: 2015

Postmortem animal mutilations due to domestic dogs in isolated domestic deaths are taphonomic modifications regularly observed by forensic pathologists. They are rarely described in the literature; however, even though they present specific patterns. Through 41 cases, 10 at the forensic institute in Lille (France) and 31 at the New York City Office of Chief Medical Examiner (USA), plus 22 cases from the literature, specific locations and patterns of postmortem scavenging lesions are proposed. These lesions are mainly distributed in three locations: the face, especially the nose and the mouth (73.1%), the neck (43.1%), and the arm (shoulder/upper limb [29.2%], hand [26.8%]). We discuss the time span between death and scavenging, the consequences on identification, and comparison with outdoor settings. Outdoor scavenging lesions are mainly located on the trunk and limbs usually sparing the head, which strongly differs from indoor distribution and imply different animal motivations. © 2015 American Academy of Forensic Sciences. Source


Aubernon C.,University of Lille Nord de France | Aubernon C.,Forensic Taphonomy Unit | Devigne C.,University of Lille Nord de France | Devigne C.,Laboratoire Ecologie and Biodiversite | And 6 more authors.
Journal of Forensic Sciences | Year: 2015

Several parameters can delay the first arrival of flies on a corpse and the subsequent development of the larvae. This study focuses on the development of Lucilia sericata (Diptera: Calliphoridae) (Meigen, 1826) on household chemical-contaminated substrates. bleach, perfume, hydrochloric acid, caustic soda, insecticide, mosquito repellent, and gasoline in quantities consistent with an amount that could possibly be spilled on a corpse were mixed with beef liver to simulate contaminated fleshes. Larvae were bred at 25°C on these media until emergence. Four developmental parameters were followed: survival rates, development times, sex ratios, and adult sizes. Hydrochloric acid, insecticide, and gasoline killed all larvae. In low quantities, caustic soda and mosquito repellent increased the development time and decreased the adult size. However, high quantities of these chemicals killed all larvae. Lastly, bleach and perfume did not affect the survival rate and barely impacted the development time or adult size. These results demonstrate common household products spilled on a corpse can strongly affect the development of Calliphoridae larvae. The effects of such products should be considered in forensic entomology cases. © 2014 American Academy of Forensic Sciences. Source


Boulay J.,University of Lille Nord de France | Boulay J.,Forensic Taphonomy Unit | Boulay J.,Free University of Colombia | Devigne C.,University of Lille Nord de France | And 5 more authors.
Animal Behaviour | Year: 2013

Vectors of aggregation are well known for some arthropod species, but not for many others. We aimed to describe larval aggregation (experiment 1) in the carrion fly, Lucilia sericata (Diptera: Calliphoridae), and to investigate the effect of food and conspecifics on larval behaviour (experiment 2). In experiment 1, 40 larvae were placed in a petri dish with a homogeneous diet for 30. min, 1. h, 3. h, 5. h or 24. h. This experiment demonstrated for the first time under controlled conditions the active aggregation of L.sericata larvae. The results indicate that the aggregation took place quickly and was reinforced with time. After only 3. h, one main aggregate comprising a majority of individuals was observed. These results also highlight the likely use by necrophagous larvae of a signal left by conspecifics as an aggregation vector. In experiment 2, we used a video-tracking system to investigate whether such an aggregative signal exists. Fed and starved larvae were tracked for 5. min in a circular area with each half marked with a different signal combination. The time spent in the signal zones, the distance travelled, the velocity, the time at the stop and the number of stops in each zone were measured. The larvae were significantly retained by a signal (mark) left by conspecifics. Together, the results of this study demonstrate the existence of a contact and/or odour-mediated signal involved in the aggregative behaviour of necrophagous larvae. © 2013 The Association for the Study of Animal Behaviour. Source

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