Fingerprints found at a crime scene can be key in criminal investigations. A method to accurately determine the age of the fingerprint, potentially crucial to linking the fingerprint to the crime, is not available at the moment. In this paper, we show that the use of the enantiomeric ratio of d/l-serine in fingerprints could pose as interesting target for age estimation techniques. We developed a UPLC-MS/MS method to determine the enantiomer ratios of histidine, serine, threonine, alanine, proline, methionine and valine from fingerprint residue. We found a significant change only in the relative ratio of d-serine with increasing fingerprint age after analysis of fingerprints up to 6 months old.
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Presentation of the progress and future outlook of the chitin valorisation project at the annual DAS Conference, Utrecht.
This dissertation aims to strengthen socioscientific issues (SSI) education by focusing on the resources available to students. SSI education is a type of science and citizenship education that supports students’ informed and critical engagement with social issues that have scientific or technological dimensions. This dissertation explores students’ SSI-related resources relevant to their engagement with SSI, such as their attitudes and social resources. The dissertation consists of four papers. The first is a position paper that introduces the concept of socioscientific capital and argues why it is important to pay attention to students’ resources in SSI-based teaching. The other three papers involve empirical, quantitative studies. Two questionnaires were developed that were used to investigate student differences regarding engagement with SSI: the Pupils’ Attitudes towards Socioscientific Issues (PASSI) questionnaire and the Use of Sources of Knowledge (USK) questionnaire. The final study is an exploration of the effects of SSI-based teaching on students’ attitudes toward SSI, considering socioscientific capital.
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