Improved estimation of postmortem interval based on differential behaviour of vitreous potassium and hypoxantine in death by hanging

Many formulae are available to estimate the relation between the potassium ([K+]) and hypoxantine ([Hx]) concentration in the vitreous humour and the postmortem interval (PMI). Typically these have been based on a correlation test and linear regression using the postmortal interval as the independent variable and [K+] or [Hx] as the dependent variable in order to estimate the confidence interval. However, a recent study has shown that a more precise measurement of PMI can be obtained if [K+] is used as the independent variable. The regression lines obtained from the most recent deceased subjects with forensic relevance received for autopsy in the Institute of Legal Medicine are [K+] = 5.589 + 0.174PMI and [Hx] = 26.459 + 3.017PMI, by changing the variables, we obtain PMI=3.967[K+] - 19.186 (R2 = 0.688, P < 0.001) and PMI = 0.172 [Hx] + 0.170 (R2 = 0.518, P < 0.001). In this paper we propose the cause of death as an extra factor which modifies the relationship and gives even greater precision in estimating PMI. In cases of death by hanging the results are considerably improved with [K+] = 5.224 + 0.225PMI and [Hx] = 15.161+4.957PMI, respectively, and consequently, PMI = 3.631[K+] - 17.334 (R2 = 0.818, P< 0.001) and PMI = 0.153[Hx] - 0.368 (R2 = 0.757, P < 0.001): the slope is less and the precision is obviously enhanced.     

Economic vote instability: Endogeneity or restricted variance? Spanish panel evidence from 2008 and 2011

While the economic vote exists in Western democracies, the question of its stability remains a subject of controversy. This article focuses on two possible factors behind the instability observed: the endogeneity problem and the restricted variance problem. The former concerns the influence of partisan thinking on economic perception, while the latter concerns the influence of economic crisis, when virtually all voters may perceive a bad economy. These problems are examined using panel data from the Spanish national elections of 2008 and 2011. After various causality tests, it is concluded that the economic vote was influential in both contests, but apparently less so in 2011. It is shown in the article that the initial 2011 result misleads because of the statistical artifact presented by the restricted variance problem. Thus, an alternative strategy for exogenising economic perceptions is developed using aggregate economic measures in a pooled cross‐sectional design whereby it is demonstrated that the economy mattered greatly under the economic crisis of 2011. This estimation strategy could be applicable to other Western democracies experiencing such economic crisis.     

First record of Hermetia illucens (Diptera: Stratiomyidae) on human corpses in Iberian Peninsula

This article presents the first record of Hermetia illucens larvae on a human corpse in Spain (the second case report in Europe). Prepupae of H. illucens, and other insects, were recovered from the dead body of a 72-year-old man in an advanced stage of decomposition. The body was located in Reus (NE Spain), in October 1998. This article provides additional biological data on experimental studies and an update on the geographic distribution of this species in the Iberian Peninsula.