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.

Claims of “rights” involve abstraction - to some extent anyway - from immediate social and political context. Academic discussion of the topic very often magnifies the abstraction. At the same time, abstraction is itself sometimes identified as the central “problem” in rights theory - and so becomes the focus of discussion of the topic. It is the focus of Professor Denninger's paper. It is also the focus of mine.

Transplanted cabbage was grown in conventional-tillage (100% cultivated) and strip-tillage (25% cultivated and 75% residue) production systems with various herbicide treatments to evaluate weed control and cabbage yield. DCPA at 9 kg ai/ha, napropamide at 1.1 kg ai/ha, oxyfluorfen at 0.3 kg ai/ha, and oxyfluorfen at 0.2 kg ai/ha plus napropamide at 1.1 kg ai/ha provided commercially acceptable (> 80%) control of carpetweed, swinecress, large crabgrass, redroot pigweed, and common lambsquarters under both tillage systems. However, only oxyfluorfen plus napropamide provided control of eclipta. At a second location, all herbicides controlled common purslane and barnyardgrass and all but DCPA controlled hairy galinsoga. Overall, cabbage yields were the same between conventional and strip-tillage systems, and among herbicide treatments when average cabbage head weights across tillage method were pooled.

The purpose of this article is to set the context for this special issue of Disaster Medicine and Public Health Preparedness on the allocation of scarce resources in an improvised nuclear device incident. A nuclear detonation occurs when a sufficient amount of fissile material is brought suddenly together to reach critical mass and cause an explosion. Although the chance of a nuclear detonation is thought to be small, the consequences are potentially catastrophic, so planning for an effective medical response is necessary, albeit complex. A substantial nuclear detonation will result in physical effects and a great number of casualties that will require an organized medical response to save lives. With this type of incident, the demand for resources to treat casualties will far exceed what is available. To meet the goal of providing medical care (including symptomatic/palliative care) with fairness as the underlying ethical principle, planning for allocation of scarce resources among all involved sectors needs to be integrated and practiced. With thoughtful and realistic planning, the medical response in the chaotic environment may be made more effective and efficient for both victims and medical responders.

(Disaster Med Public Health Preparedness. 2011;5:S20-S31)

Having surveyed ≈ 10% of the sky, we have identified more than 130 PN candidates by surveying multicolour Digitized Sky Survey (DSS), Sloan Digitized Sky Survey (SDSS), and combined [O III], Hα and [S II] images. In a first imaging and spectroscopy campaign, 51 objects were identified as true and probable PNe. This work presents an additional 17 probable or possible PNe identified since that study. The majority of these candidates are situated at Galactic latitudes |b| > 5^, with the exception of seven objects located closer to the Galactic plane. Using the techniques described here that do not require any new survey data, we anticipate that many more PNe are waiting to be found, perhaps as many as 90.

With global warming, the clearance of the Northwest Passage and the rising demands for new energy resources, the sovereignty of Canadian and other national land claims in the Arctic north is coming into question by those wishing to control access to this region. The present paper examines issues involving emerging landmasses, maritime rights, strategic control and navigation, perhaps the most important variable, and the consequences in terms of commercial economies and geopolitical impacts. We consider many variables such as the 1982 Falkland Islands war as a demonstrative example that may have translatable impact in future years. Our purpose in this paper is to raise awareness of impending geopolitical activities that are inevitable during the 21st century as the Arctic pack ice retreats.

The majority of stars in the Galactic field and halo are part of binary or multiple systems. A significant fraction of these systems have orbital separations in excess of thousands of astronomical units, and systems wider than a parsec have been identified in the Galactic halo. These binary systems cannot have formed through the ‘normal’ star-formation process, nor by capture processes in the Galactic field. We propose that these wide systems were formed during the dissolution phase of young star clusters. We test this hypothesis using N-body simulations of evolving star clusters and find wide binary fractions of 1–30%, depending on initial conditions. Moreover, given that most stars form as part of a binary system, our theory predicts that a large fraction of the known wide ‘binaries’ are, in fact, multiple systems.

Nasal, perineal, axillary and hand swabs collected from 361 patients immediately before operation were examined for Staphylococcus aureus.

The organism was isolated more often from all three skin sites in nasal carriers of Staph. aureus than in non-carriers.

Twelve per cent of the patients, and 4 % of those with negative nose swabs were perineal carriers. Two per cent were heavy perineal carriers of Staph. aureus strains which could not be isolated by direct culture from a nasal swab. Staphylococcal strains from these heavy, independent, perineal carriers were more often resistant to tetracycline than were strains from nasal carriers.

Turkeys can have a high incidence of leg problems and leg-related mortality can exceed 1% per week starting at approximately 15 weeks of age. Development of bone and connective tissue is dependent on a number of factors including the availability of trace minerals. These minerals are essential for the function of the metalloenzymes involved in the synthesis of structural connective tissue and bone. For example Zn and Cu are required for the synthesis and crosslinking of collagen respectively. Vitamin D and its metabolites also play important roles in bone development, as deficiencies can lead to a failure of mineralization, leg weakness and rickets. The aim of the study was to determine the impact of partially replacing inorganic sources of Zn, Cu, Mn and Se in the diet of growing turkeys with an organic trace mineral source, Mintrex®PSe, in the presence or absence of 25-hydroxy D3, on growth performance, leg abnormalities and bone strength.