THE EFFECT LETHAL DOSAGE OF MORPHINE AND ARSINIC ON THE GROWTH OF LARVA CHRYSOMA.Sp RATE ON WHISTAR RAT IN MEDAN CITY 

Muhammad Fernando Manik, Agustinus Sitepu, Amri Amir

Forensic and Medicolegal Spesialist Medical Education Program

Medical Faculty of Universitas Sumatera Utara

Background: Lately, we often encounter many unnatural deaths, including: murder, rape, drug overdose, poisoning, or suicide. And sometimes unnatural deaths are largely undetected and only corpses are found left behind began to rot with many fly larvae all over their bodies. In this case the development of the fly's life cycle, which starts by laying eggs, then develops into larval instar I, II, III, prepupaee, pupae and become flies can be react with carcasses of rats that have been given morphine and arsenic.

Method: Observational research used 9 male Whistar rats aged 3-4 months with a weight of 200-300 grams divided by 3 (mice given morphine with lethal doses, arsenic given lethal doses and mice dislocated by cervical vertebrae). Before that flies were catch, there were 100 Chrysoma flies and they were put into 1 cage which was covered with gauze. Observation of death and recorded. then a 1 cm thin incision is made in the right abdomen and then it is placed in a cage filled with Chrysoma flies. The first observation is made after the sample is placed and recorded D0. Observations that are considered are changes in sample, egg or larvae of fly that inhabiting the sample.

Result: The development of the fly's life cycle in the administration of morphine and arsenic is faster than control. Eggs were faster found in the control than morphine and arsenic administration. Instar larvae are 3 times longer in morphine compared with arsenic and control but the Instar larvae cycle is 3 times faster.   

Conclusion: Administered of morphine and arsenic is very influential on the development cycle of flies, growth in larval length is significantly higher. Administered of morphine and arsenic is very influential on the egg placement and the process of decaying rat carcasses longer.

Keywords: Time of Death, Larval Length