The preservation of quartz grain surface textures following vehicle fire and their use in forensic enquiry

During a terrorist trial, dispute arose as to whether the temperature produced in a car fire was sufficient to destroy quartz grain surface textures. A series of seven sequential experiments showed that the temperature for quartz surface texture modification/destruction and the production of vugs, vesicles and glassy precipitation ('snowdrifting') occurred at 1200 degrees C under normal atmospheric conditions. By adding a number of man-made and natural substances, it was found that only the presence of salts depressed this modification temperature (to 900 degrees C). Experiments to determine the temperature of fire in a car indicated that the maximum temperature produced under natural conditions (810 degrees C) was insufficient to affect the quartz grain Surface textures. These results confirm the use of surface texture analysis of quartz grains recovered from the remains of cars Subjected to fire and their use as a forensic indicator. (C) 2008 Forensic Science Society. Published by Elsevier Ireland Ltd. All rights reserved

Three dimensional optical imaging of blood volume and oxygenation in the neonatal brain

Optical methods provide a means of monitoring cerebral oxygenation in newborn infants at risk of brain injury. A 32-channel optical imaging system has been developed with the aim of reconstructing three-dimensional images of regional blood volume and oxygenation. Full image data sets were acquired from 14 out of 24 infants studied; successful images have been reconstructed in 8 of these infants. Regional variations in cerebral blood volume and tissue oxygen saturation are present in healthy preterm infants. In an infant with a large unilateral intraventricular haemorrhage, a corresponding region of low oxygen saturation was detected. These results suggest that optical tomography may provide an appropriate technique for investigating regional cerebral haemodynamics and oxygenation at the cotside. (c) 2006 Elsevier Inc. All rights reserved

Sampling of explosive residues: the use of a gelatine-based medium for the recovery of ammonium nitrate

Forensic scientists must be able to recover traces of any original explosive materials not consumed in the detonation, in a careful controlled manner to aid a crime reconstruction. In current sampling techniques, the collection efficiency of post-blast residue is highly variable and often dependent on the swabbing materials and solvent systems used. To address these method limitations, this study presents a gelatine-based sampling medium and assesses its capabilities for the collection of ammonium nitrate. Common surfaces were spotted with a known concentration of ammonium nitrate, the unset gel applied, allowed to set, and then peeled from the surface. The gel was dissolved, and solid phase extraction employed to isolate the target explosive compound and remove the constituents of the gel. The eluate was concentrated and subsequently analysed and quantified. Overall, the gel formulation was able to collect ammonium nitrate from all of the test surfaces, with recoveries ranging from 0.1% to 61.7%. This study presents a gelatine-based formulation that has the potential to become a valuable asset in the forensic tool kit for the collection of explosive traces. A key attribute of the gel is that it offers an alternative recovery tool to conventional swabbing and solvent extraction methods

A lactate-derived chiral aldehyde for determining the enantiopurity of enantioenriched primary amines

In this paper we describe the use of a chiral aldehyde derived from lactate esters for determining the enantiopurity of primary amines, via the formation of diastereomeric imines. The method was shown to be suitable for reproducibly determining the enantiopurity of a diverse set of chiral amines. Both enantiomers of the aldehyde can be prepared in two steps from commercially available materials

A prospective observational study of machine translation software to overcome the challenge of including ethnic diversity in healthcare research

Aim This study investigates whether machine translation could help with the challenge of enabling the inclusion of ethnic diversity in healthcare research. Design A two phase, prospective observational study. Methods Two machine translators, Google Translate and Babylon 9, were tested. Translation of the Strengths and Difficulties Questionnaire (SDQ) from 24 languages into English and translation of an English information sheet into Spanish and Chinese were quality scored. Quality was assessed using the Translation Assessment Quality Tool. Results Only six of the 48 translations of the SDQ were rated as acceptable, all from Google Translate. The mean number of acceptably translated sentences was higher (P = 0·001) for Google Translate 17·1 (sd 7·2) than for Babylon 9 11 (sd 7·9). Translation by Google Translate was better for Spanish and Chinese, although no score was in the acceptable range. Machine translation is not currently sufficiently accurate without editing to provide translation of materials for use in healthcare research

Multi-objective Bayesian optimisation using an exploitative attainment front acquisition function

This is the author accepted manuscript. The final version is available from IEEE via the DOI in this recordEfficient methods for optimising expensive black-box problems with multiple objectives can often themselves become prohibitively expensive as the number of objectives is increased. We propose an infill criterion based on the distance to the summary attainment front which does not rely on the expensive hypervolume or expected improvement computations, which are the principal causes of poor dimensional scaling in current stateof-the-art approaches. By evaluating performance on the wellknown Walking Fish Group problem set, we show that our method delivers similar performance to the current state-of-theart. We further show that methods based on surrogate mean predictions are more often than not superior to the widely used expected improvement, suggesting that the additional exploration produced by accounting for the uncertainty in the surrogate’s prediction of the optimisation landscape is often unnecessary and does not aid convergence towards the Pareto fron

Qualitative study to understand the barriers to recruiting young people with cancer to BRIGHTLIGHT: a national cohort study in England

Objectives: BRIGHTLIGHT is a national evaluation of cancer services for teenagers and young adults in England. Following challenges with recruitment, our aim was to understand more fully healthcare professionals’ perspectives of the challenges of recruiting young people to a low-risk observational study, and to provide guidance for future recruitment processes. / Design: Qualitative. / Setting: National Health Service (NHS) hospitals in England. / Methods: Semistructured telephone interviews with a convenience sample of 23 healthcare professionals. Participants included principal investigators/other staff recruiting into the BRIGHTLIGHT study. Data were analysed using framework analysis. / Results: The emergent themes were linked to levels of research organisational management, described using the levels of social network analysis: micro-level (the individual; in this case the target population to be recruited—young people with cancer); meso-level (the organisation; refers to place of recruitment and people responsible for recruitment); and macro-level (the large-scale or global structure; refers to the wider research function of the NHS and associated policies). Study-related issues occurred across all three levels, which were influenced by the context of the study. At the meso-level, professionals’ perceptions of young people and communication between professionals generated age/cancer type silos, resulting in recruitment of either children or adults, but not both by the same team, and only in the cancer type the recruiting professional was aligned to. At the macro-level the main barrier was discordant configuration of a research service with a clinical service. / Conclusions: This study has identified significant barriers to recruitment mainly at the meso-level and macro-level, which are more challenging for research teams to influence. We suggest that interconnected whole-system changes are required to facilitate the success of interventions designed to improve recruitment. Interventions targeted at study design/management and the micro-level only may be less successful. We offer solutions to be considered by those involved at all levels of research for this population

Involving young people in BRIGHTLIGHT from study inception to secondary data analysis: Insights from 10 years of user involvement

© The Author(s). Background Young people with cancer, broadly those aged 13–24 years at diagnosis, warrant special attention; physiological and psychological growth creates complex psychosocial needs which neither adult nor child systems are suitably designed to deal with. Resulting from these needs, they are often described as ‘vulnerable’, ‘hard to reach’ and ‘difficult to engage’, and consequently are often over looked for patient and public involvement/ engagement (PPIE) roles. In our study ‘BRIGHTLIGHT’, we set out to evaluate whether specialist care for young people adds value, ensuring young people were central to our PPIE activities. We believe that BRIGHTLIGHT is unique as a very large study of young people with cancer which has successfully overcome the challenges of including young people in the research process so we are confident that they have influenced every aspect of study design, conduct and dissemination. Methods We chronicle a period of 10 years, over which we describe our approach and our methods to involving young people in PPIE activities in BRIGHTLIGHT. We describe the feasibility work, study set up, conduct and dissemination of our findings, and weave through our story of PPIE to illustrate its benefits. Through the narration of our experience we highlight significant points that both influenced and changed our direction of travel. We reflect on our experiences and offer some practical advice for those looking to do the same. Results In the 10 years since the BRIGHTLIGHT feasibility work began we have involved more than 1200 young people. Their contributions have been isolated and mapped over a 10-year period. We begin at an early step of identifying what research questions to prioritize, we then plot PPIE activities for one of these research priorities, place of care, which evolved into BRIGHTLIGHT. We document steps along the way to evidence the impact of this involvement. Conclusions Young people can make a valuable contribution to healthcare research given adequate support from the research team. Although some challenges exist, we propose that the benefits to young people, researchers and the study considerably outweigh these challenges and PPIE with young people should be integrated in all similar research studies

Novel participatory methods of involving patients in research: naming and branding a longitudinal cohort study, BRIGHTLIGHT

Background: Patient and public involvement (PPI) is central to research and service planning. Identifying effective, meaningful ways of involvement is challenging. The cohort study ‘Do specialist services for teenagers and young adults with cancer add value?’ follows young people for three years, examining outcomes associated with specialist care. Participant retention in longitudinal research can be problematic potentially jeopardising study completion. Maximising study awareness through high impact branding and publicity may improve study retention. Study names are typically generated by researchers rather than designed with patients. We aimed to involve young people in developing a brand identity and name to ‘Do specialist services for teenagers and young adults with cancer add value?’. Methods: Nine young people aged 17–26 years diagnosed with cancer when aged 14–25 years participated in a one day workshop with further data collection at a patient conference. Methodology was similar to conventional branding and naming exercises and was divided into six stages. The workshop comprised five stages. Stage 1: ‘What’s in a brand’ allowed young people to enquire why brands/logos are important, Stage 2: ‘Brand Transformation’ identified what young people needed to know and believe about the study when approached about participation, Stage 3: ‘Brand Essence’ determined how we wanted the study to be perceived by young people, Stage 4: ‘What’s in a name’ identified potential names for the study. Stage 5: ‘Logo creation’ assembled the mood and feel of logos. Stage 6 was logo design and an electronic survey of 249 young people attending a patient conference. Results: BRIGHTLIGHT was the final study name and the brand essence (or study personality) was friendly, supportive and inspiring. Four logos were designed and the final logo received 47% (n = 115) of votes. Conclusions: Acceptance and retention to BRIGHTLIGHT is higher than anticipated (80% versus 60%), this may be related to our integral PPI strategy. We propose this reproducible methodology as an important, enjoyable, and novel way of involving patients in research and a welcome alternative to researcher-developed acronyms. Ideally this should be carried out prior to engaging with healthcare professionals to prevent confusion around study identity