Can Stable Isotopes and Radiocarbon Dating Provide a Forensic Solution for Curbing Illegal Harvesting of Threatened Cycads?

Cycads in South Africa are facing an extinction crisis due to the illegal extraction of plants from the wild. Proving wild origin of suspect ex situ cycads to the satisfaction of a court of law is difficult, limiting law enforcement efforts. We investigated the feasibility of using multiple stable isotopes to identify specimens removed from the wild. Relocated and wild specimens from two species in the African genus Encephalartos (E. lebomboensis and E. arenarius) were sampled. ¹⁴C analysis indicated that a ± 30‐year chronology could be reliably obtained from the cycads. For E. arenarius, pre‐relocation tissue was consistent with a wild origin, whereas tissue grown post‐relocation was isotopically distinct from the wild for ⁸⁷Sr/⁸⁶Sr and δ¹⁵N. For E. lebomboensis, δ³⁴S, δ¹⁸O, and ⁸⁷Sr/⁸⁶Sr were different between relocated and control plants, consistent with the >30 years since relocation. Our findings demonstrate the potential for a forensic isotope approach to identify illegal ex situ cycads.     

Working women in France,nineteenth and twentieth centuries. Where,when, and which women were in work at marriage?

We look at women's labour force participation for the whole of France in the nineteenth and twentieth centuries. We study to what extent young women were working at the time of their marriage, in which occupations, and how differences in labour force participation might be explained. Using a sample of 53,451 marriage records from the TRA project, we identify regional and temporal differences in rates of female labour force participation and in types of work in France between 1860 and 1986.We observe rather stable levels of female labour force participation between 1860 and 1950 of about 60 per cent, but higher levels in the second half of the twentieth century. Over time, women started to work across virtually all occupational sectors. Regional differences declined over time but continued to exist in the late twentieth century. We formulate a set of hypotheses to explain which women worked, taking into account their resources, as well as their expectations, in a male-breadwinner-dominated society. The results of our hierarchical logistic analysis indicate that women with fewer parental resources were more likely to work.     

Rethinking the English–Arabic Legal Translation Course: Restructuring for Specific Competence Acquisition

International Journal for the Semiotics of Law - Revue internationale de Sémiotique juridique - The standards for translating texts in specialized fields have become particularly rigorous with...     

Voting in the rain: the impact of rain on participation in open-air assemblies

ABSTRACT

The analysis of how weather conditions influence participation at the ballot and whether bad weather influences ballot decisions has recently gained momentum. This paper analyses the influence of rain on participation in the Landsgemeinde – the main decision-making body of two Swiss cantons, wherein citizens meet on the main square in order to debate and decide bindingly on political matters of all sorts. We rely on a survey with an in-built conjoint experiment that presents citizens with several hypothetical Landsgemeinde situations characterized by randomly varied combinations of weather and other conditions such as outcome favorability, the expected closeness of the vote and the company available during the event. We find that rain not only decreases overall participation but it also lowers participation when votes are expected to be uncontested and for individuals who do not primarily attend the Landsgemeinde for political reasons.     

Estimating the Number of Contributors to Forensic DNA Mixtures: Does Maximum Likelihood Perform Better Than Maximum Allele Count?

Abstract: Determining the number of contributors to a forensic DNA mixture using maximum allele count is a common practice in many forensic laboratories. In this paper, we compare this method to a maximum likelihood estimator, previously proposed by Egeland et al., that we extend to the cases of multiallelic loci and population subdivision. We compared both methods’ efficiency for identifying mixtures of two to five individuals in the case of uncertainty about the population allele frequencies and partial profiles. The proportion of correctly resolved mixtures was >90% for both estimators for two‐ and three‐person mixtures, while likelihood maximization yielded success rates 2‐ to 15‐fold higher for four‐ and five‐person mixtures. Comparable results were obtained in the cases of uncertain allele frequencies and partial profiles. Our results support the use of the maximum likelihood estimator to report the number of contributors when dealing with complex DNA mixtures.     

Sexual assaults in Geneva between 2006 and 2010

In Geneva, all sexual assault victims are examined both by a gynaecologist and a forensic pathologist with special training in clinical forensic medicine. Between 2006 and 2010, 473 victims were examined following such an assault. Over the years, the number of sexual assaults rose steadily. Most victims were aged between 15 and 30 years. The majority of the assaults occurred at night and on the weekend and often happened at the place where the perpetrator or the victim lived. Usually, the offender acted alone and was known to the victim. Many victims hesitate to present for an examination, which makes it difficult to collect evidence. Penetration was usually vaginal and without the use of a condom. Injuries on the body or genitals were seen in only half of the cases for the first ones and in less than one third for the second ones. Quite often (at least in 42 % of the cases), the victim consumed alcohol before the assault and the use of drugs--especially cannabis--was not uncommon either.     

Cyanide quantification in post-mortem biological matrices by headspace GC-MS

Cyanide is a powerful chemical asphyxiant found in some forensic cases following voluntary (suicide) or involuntary ingestion (fire, accidental exposure). A quantification method for cyanide that is specifically suited to post-mortem forensic purposes was developed. Determination was performed by headspace gas chromatography coupled to mass spectrometry using a GS-GASPRO column on an HP-6890 gas chromatograph with an HP-5973N mass detector. The biological sample was treated with an internal standard, frozen, glacial acetic acid was added and the sample was then incubated at 60°C for 15min. The headspace was sampled with a disposable syringe, and analyzed to quantify hydrogen cyanide. Isotopically labeled cyanide ((13)C(15)N) was used as the internal standard to minimize matrix effect and sampling error. The method produced an extended linear dynamic range (0.07-50μg/mL), and a method detection limit of 0.02μg/mL. Identical calibration curves were obtained when blood, gastric contents and aqueous solutions were used as the calibration standard matrix. This method was also successful in quantitating cyanide in gastric contents, one of the most variable biological fluids. The method has been validated and is being used for current forensic cases such as fire victims and suicides.