Gravitational Radiation from First-Order Phase Transitions

It is believed that first-order phase transitions at or around the GUT scale will produce high-frequency gravitational radiation. This radiation is a consequence of the collisions and coalescence of multiple bubbles during the transition. We employ high-resolution lattice simulations to numerically evolve a system of bubbles using only scalar fields, track the anisotropic stress during the process and evolve the metric perturbations associated with gravitational radiation. Although the radiation produced during the bubble collisions has previously been estimated, we find that the coalescence phase enhances this radiation even in the absence of a coupled fluid or turbulence. We comment on how these simulations scale and propose that the same enhancement should be found at the Electroweak scale; this modification should make direct detection of a first-order electroweak phase transition easier.Comment: 7 pages, 7 figure

Finishing the euchromatic sequence of the human genome

The sequence of the human genome encodes the genetic instructions for human physiology, as well as rich information about human evolution. In 2001, the International Human Genome Sequencing Consortium reported a draft sequence of the euchromatic portion of the human genome. Since then, the international collaboration has worked to convert this draft into a genome sequence with high accuracy and nearly complete coverage. Here, we report the result of this finishing process. The current genome sequence (Build 35) contains 2.85 billion nucleotides interrupted by only 341 gaps. It covers ∼99% of the euchromatic genome and is accurate to an error rate of ∼1 event per 100,000 bases. Many of the remaining euchromatic gaps are associated with segmental duplications and will require focused work with new methods. The near-complete sequence, the first for a vertebrate, greatly improves the precision of biological analyses of the human genome including studies of gene number, birth and death. Notably, the human enome seems to encode only 20,000-25,000 protein-coding genes. The genome sequence reported here should serve as a firm foundation for biomedical research in the decades ahead

Proactive Environmental Strategies in Healthcare Organisations: Drivers and Barriers in Italy

This study sheds new light on why healthcare organisations are having difficulty responding to the growing pressure from stakeholders to proactively address their responsibility to deliver high-quality services without harming the environment. Basing our work on past research on stakeholder pressure and environmental barriers, we conceptualise and empirically test the effect of the interplay between stakeholder pressure and internal barriers on healthcare organisations’ adoption of proactive environmental strategies (PESs). To test the proposed hypotheses, a survey was carried out among medical directors of Italian healthcare organisations in 2012. Our results show that the lack of commitment to environmental issues within the organisation represents the main barrier to healthcare organisations’ implementing PESs. Furthermore, the difficulties in evaluating the impacts of advanced environmental practices negatively moderate the influence of stakeholders on developing PESs. Our findings contribute to extending previous knowledge on PESs in two ways: (i) focusing on the healthcare sector, our study investigates the phenomenon in a research context that has been largely overlooked in the sustainability literature; and (ii) cross-cutting previous research on stakeholder pressure and internal barriers, the study conceptualises and tests a more complete framework for understanding the adoption of PESs