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Michelle Marshall MS Victoria Chraïbi PhD Ryan Morgan PhD 《Journal of forensic sciences》2023,68(4):1237-1244
The presence of diatom algae in bone marrow has been used as forensic evidence of drowning for several decades; however, these studies are based on known or suspected recent drowning events. This study addresses the potential for diatoms to enter the bone marrow of skeletal remains, that is, de-fleshed long bones post-mortem. In laboratory and field experiments, bones were either inflicted with two access points by a cut and acid pitting or left intact. The bones were submerged in water for at least 1 week and up to 3 months. Samples of the bone surface and marrow were inspected for diatoms. The analysis considered the time required for diatoms to enter marrow and whether genus characteristics like size or mobility affect entry. The presence of an access point influenced diatom entry in that bones without an introduced access point had zero to one diatom present in the marrow, whereas a bone with an access point had >150 diatoms present in the marrow. The results of both laboratory and field phases suggest that diatoms will reliably colonize bone in as quickly as 1 week, establishing and maintaining communities for at least 3 months. However, the bone surface assemblages differ from the source community. Bone marrow displayed even more restrictive access to diatom colonization, resulting in communities dominated by small raphid diatoms. Based on these findings, we suggest some caveats on the use of diatoms as trace evidence in forensic science with recommendations for future avenues of research. 相似文献
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Louise Ryan 《Feminist Review(on-Line)》2000,66(1):73-94
War is a highly gendered experience which is both informed by and informs constructions of masculinity and femininity. The dominant depiction of masculine heroes and feminine victims simplifies the complex intersections of militarism, nationalism and gendered roles and identities. Focusing on a case study of the Anglo-Irish War or War of Independence (1919–1921), this paper examines how violence against women, especially sexual violence, was written about and reported in ways which framed representations of Irish and British masculinity and Irish femininity.In addition, by analysing a range of varied sources including newspapers, autobiographical accounts and recorded testimonies, this paper attempts to assess the extent to which violence against women formed a key aspect of military practice in the war. In conclusion, I engage with some of the difficulties faced by researchers today in exploring evidence of gendered violence in specific historical, cultural and militarized contexts. 相似文献
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The need to accurately estimate the postmortem interval (PMI) has prompted research into factors affecting fly oviposition (i.e., oviposition and/or larviposition) on a corpse. Research efforts have focused on whether or not diurnally active flies oviposit during nighttime hours. This study reports that nocturnal oviposition (defined as occurring between 2100-0600 h CDST (Central Daylight Savings Time)) did not occur on freshly killed white rats or mice, on beef (fresh or aged up to 48 h), on freshly thawed pigs, nor, usually, on thawed pigs that were aged for up to 48 h. Limited oviposition did occur between 2100 and 2120 h on one bloated pig at a lighted rural site. Necrophilous flies were present and active at lighted and dark sites (urban and rural) before and immediately after sunset, but fly activity on the bait ceased within 50 min postsunset and did not resume until after 0600 h. These observations support other studies reporting that diurnally active flies do not oviposit during the nighttime. 相似文献