The first demonstration of laser action in ruby was made in 1960 by T. H. Maiman of Hughes Research Laboratories, USA. Many laboratories worldwide began the search for lasers using different materials, operating at different wavelengths. In the UK, academia, industry and the central laboratories took up the challenge from the earliest days to develop these systems for a broad range of applications. This historical review looks at the contribution the UK has made to the advancement of the technology, the development of systems and components and their exploitation over the last 60 years.

Marine worms in the genus Osedax, have specialized ‘root’ tissues used to bore into the bones of decomposing vertebrate skeletons and obtain nutrition. We investigated the borings of nine Osedax species, using micro computed tomography to quantitatively describe the morphology of the borings and provide three-dimensional reconstructions of the space occupied by Osedax root tissues inside the bone. Each Osedax species displayed a consistent boring morphology in any given bone, but these differed between bones. In bones where multiple species coexisted there was limited evidence for spatial niche partitioning by Osedax root tissues inside the bones investigated here. The new morphological data may be applied to Osedax traces in fossil bones, showing that borings can be used to indicate minimum species richness in these bones.

We report a longitudinal, prospective, multicentre cohort study designed to measure the outcomes of gastrostomy tube feeding in children with cerebral palsy (CP). Fifty-seven children with CP (28 females, 29 males; median age 4y 4mo, range 5mo to 17y 3mo) were assessed before gastrostomy placement, and at 6 and 12 months afterwards. Three-quarters of the children enrolled (43 of 57) had spastic quadriplegia; other diagnoses included mixed CP (6 of 57), hemiplegia (3 of 57), undiagnosed severe neurological impairment (3 of 57), ataxia (1 of 57), and extrapyramidal disorder (1 of 57). Only 7 of 57 (12%) could sit independently, and only 3 of 57 (5%) could walk unaided. Outcome measures included growth/anthropometry, nutritional intake, general health, and complications of gastrostomy feeding. At baseline, half of the children were more than 3SD below the average weight for their age and sex when compared with the standards for typically-developing children. Weight increased substantially over the study period; the median weight z score increased from –3 before gastrostomy placement to –2.2 at 6 months and –1.6 at 12 months. Almost all parents reported a significant improvement in their child's health after this intervention and a significant reduction in time spent feeding. Statistically significant and clinically important increases in weight gain and subcutaneous fat deposition were noted. Serious complications were rare, with no evidence of an increase in respiratory complications.

The aim of this prospective cohort study was to evaluate the impact of gastrostomy tube feeding on the quality of life of carers of children with cerebral palsy (CP). Short-Form 36 version II was used to measure quality of life in carers of 57 Caucasian children with CP (28 females, 29 males; median age 4y 4mo, range 5mo to 17y 3mo) six and 12 months after insertion of a gastrostomy tube. Responses were calibrated against a normative dataset (Oxford Healthy Life Survey III). Six months after gastrostomy feeding was started, a substantial rise in mean domain scores for mental health, role limitations due to emotional problems, physical functioning, social functioning, and energy/vitality were observed. At 12 months after gastrostomy placement, carers reported significant improvements in social functioning, mental health, energy/vitality (mean increase >9.8 points; p<0.03), and in general health perception (mean increase 6.35 points; p=0.045) compared with results at baseline. Moreover, the values obtained for these domains at 12 months were not significantly different from the normal reference standard. Carers reported a significant reduction in feeding times, increased ease of drug administration, and reduced concern about their child's nutritional status. This study has demonstrated a significant, measurable improvement in the quality of life of carers after insertion of a gastrostomy feeding tube.