Fluorescence of a Natural Fluorophore as a Key to Improve Fingerprint Contrast Image

The optical and morphological properties of resveratrol were investigated. This nontoxic fluorescent natural material, emitting in the visible blue light, was used as an optical marker, enabling the enhancement of the image contrast coming from relief pictures marked on challenging surfaces. By applying appropriated imaging softwares, this marker was verified to be very useful in the latent fingerprint recognition deposited on different wood surface types, mainly those with high level of roughness, where conventional forensic materials do not allow effective fingerprint image visualization.     

Ownership and conditionality in IMF-supported programs: Back to Per Jacobsson’s time

Using a historical case study this article provides an example of how heterogeneity of interests within a government may affect the interplay between country ownership of reforms and conditionality in IMF-supported programs. The case study also highlights how pro-reformers’ preferences may be conditional on reforms advancing their personal agendas. This suggests a new issue to be addressed by formal models of conditionality. Two main themes emerge from the analysis: (a) the importance of a clear hierarchy to unify heterogeneous interests among decision makers; and, (b) a flexible country-tailored approach to conditionality can contribute to domestic ownership of reforms.

Determination of MDMA, MDA, MDEA and MBDB in oral fluid using high performance liquid chromatography with native fluorescence detection

This paper describes the analytical methodology for the determination of MDMA, MDA, MDEA and MBDB in oral fluid. After a liquid–liquid extraction, the analysis was carried out by high performance liquid chromatography (HPLC), with fluorescence detection. The detector wavelength was fixed at 285 nm for excitation and 320 nm for emission. The mobile phase, a mixture of phosphate buffer (pH = 5) and acetonitrile (75:25), and the column, Kromasil 100 C8 5 μm 250 mm × 4.6 mm, allowed good separation of the compounds in an isocratic mode in only 10 min. The method was validated and showed good limits of detection (2 ng/mL) and quantitation (10 ng/mL) for all the amphetamine derivatives. No interfering substances were detected. A stability study of these compounds in oral fluid stored at three different temperatures (−18, 4 and 20 °C) over 10 weeks was conducted, showing a time-dependent degradation of the four compounds.     

Editorial

Ohne Zusammenfassung

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Editorial

     

How citizenship matters (or not): the citizenship–belonging nexus explored among residents in Oslo,Norway

This article sheds light on what citizenship means for individuals’ experiences of belonging. Through 41 interviews conducted in Oslo, Norway, we trace understandings of how, when and why citizenship matters (or not) for belonging. Our interviewees fall into one of four categories: born citizens; naturalized citizens; dual citizens and non-Norwegian citizens who would qualify for naturalization, thus mixing participants with and without immigrant backgrounds. We interpret individuals’ experiences evaluating whether formal citizenship is explicitly or implicitly salient and whether it is associated with secure or insecure belonging. We find that citizenship matters for security and recognition, both linked to belonging, in expected and unexpected ways. Our findings point to how, when and why citizenship matters (or not) for belonging, constituting the citizenship–belonging nexus. Here, race continues to matter, as does the materiality of the passport document, in how the citizenship–belonging nexus interacts with the nation as locus of membership for citizens.     

Editorial

Ohne Zusammenfassung

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Editorial

     

STR analysis of artificially degraded DNA-results of a collaborative European exercise

Degradation of human DNA extracted from forensic stains is, in most cases, the result of a natural process due to the exposure of the stain samples to the environment. Experiences with degraded DNA from casework samples show that every sample may exhibit different properties in this respect, and that it is difficult to systematically assess the performance of routinely used typing systems for the analysis of degraded DNA samples. Using a batch of artificially degraded DNA with an average fragment size of approx. 200 bp a collaborative exercise was carried out among 38 forensic laboratories from 17 European countries. The results were assessed according to correct allele detection, peak height and balance as well as the occurrence of artefacts. A number of common problems were identified based on these results such as strong peak imbalance in heterozygous genotypes for the larger short tandem repeat (STR) fragments after increased PCR cycle numbers, artefact signals and allelic drop-out. Based on the observations, strategies are discussed to overcome these problems. The strategies include careful balancing of the amount of template DNA and the PCR cycle numbers, the reaction volume and the amount of Taq polymerase. Furthermore, a careful evaluation of the results of the fragment analysis and of automated allele calling is necessary to identify the correct alleles and avoid artefacts.     

Improving Children's Recall of an Occurrence of a Repeated Event: Is It a Matter of Helping Them to Generate Options?

Three experiments were conducted to explore whether children's recall of an occurrence of a repeated event could be improved by encouraging them to consider various details that occurred across a series of events prior to making a judgement about which details were included in the target (to-be-recalled) occurrence. Experiment 1 explored whether children's recall of the target occurrence was better after the interviewer presented all the items from the series prior to the child identifying the final item. Experiment 2 explored whether having the children generate all the items facilitated their subsequent recall of the target occurrence. Finally, Experiment 3 directly compared the effectiveness of the above 2 procedures. Regardless of the children's age, the retention interval, or the type of item, children's capacity to identify which details were included in a target occurrence was enhanced when they were initially provided with all the possible details from the series of events. However, without relying on the interviewer to generate the options, the benefit of the technique was directly contingent on the children's ability to generate content details; this was a distinct source of difficulty for the children. Indeed, having children generate options had no beneficial effect on decisions about the temporal position of items unless performance was made conditional on the children's ability to remember the relevant details in the first place. The implications of the findings for the legal setting and for future research are discussed.