Measurement of the cross-section for b-jets produced in association with a Z boson at root s=7 TeV with the ATLAS detector ATLAS Collaboration

A measurement is presented of the inclusive cross-section for b-jet production in association with a Z boson in pp collisions at a centre-of-mass energy of root s = 7 TeV. The analysis uses the data sample collected by the ATLAS experiment in 2010, corresponding to an integrated luminosity of approximately 36 pb(-1). The event selection requires a Z boson decaying into high P-T electrons or muons, and at least one b-jet, identified by its displaced vertex, with transverse momentum p(T) > 25 GeV and rapidity vertical bar y vertical bar < 2.1. After subtraction of background processes, the yield is extracted from the vertex mass distribution of the candidate b-jets. The ratio of this cross-section to the inclusive Z cross-section (the average number of b-jets per Z event) is also measured. Both results are found to be in good agreement with perturbative QCD predictions at next-to-leading order

Sustainable social development in the South African mining sector

http://dx.doi.org/10.1080/0376835090308678

Photosynthetic units and carbon assimilation in leaves of grain Sorghum under different light intensities

The Cyt f and P700 contents in leaves of three Sorghum, varieties were measured, in relation to their carbon assimilation, under different light intensities during growth. At the maximum irradiation used (1,800 μ E m-2 s-1) the ratio of P700 to Cyt f was close to unity, whereas under low irradiation (450 μ E m-2 s-1) the ratio of P700 to Cyt f ranged from two to three. A strikingly positive correlation existed between the P700 contents of the leaves and their rates of carbon dioxide fixation, dry matter production and Cyt f contents, only when the plants were grown under high light intensities. The P700 content of the leaves in plants grown under low irradiation was unrelated to the contents of Cyt f. Thus, at a high light intensity there is a close relationship between the Cyt f and P700 levels, but at low intensities the amounts of electron carriers and the reaction centre are independent

Character association in paprika (Capsicum annuum/i L.)1

Correlation studies conducted in 94 diverse genotypes of paprika (Capsicum annuum) grown at Lam (Andhra Pradesh) indicated that dry fruit yield plant-1 showed significant and positive association with plant height, plant spread, number of fruits plant-1, fruit girth, seeds fruit-1 and capsanthin content. Path coefficient studies revealed that number of fruits plant-1 had the highest positive direct effect on dry fruit yield plant-1. Number of fruits plant-1, plant height, plant spread, number of seeds fruit-1, days to maturity and capsanthin content (in the given order) were important yield and quality components having direct bearing on dry fruit yield and hence can be considered while breeding for improved yield in paprika

'No one knows like we do' - the narratives of mental health service users trained as researchers

In 2008, Mind in Bexley received a research development grant from the Big Lottery Fund and a training grant from Bexley Care Trust to empower service users to participate and contribute to a pilot research project. The project aims were to work with, develop, train and support the service users as researchers, in order to record the narratives of service users who have common experiences of mental health distress and treatment. The research development project set up an advisory group, created and developed a partnership with the University of Kent and provided workshops and training sessions to explore some of the principles of research and ethics. In addition, the group under took a preliminary literature review, developed and refined a research questionnaire and piloted interviews with six service users. Many issues were raised and lessons learned during the planning and conduct of the project. This paper discusses the process and reflects on aspects of the project's design and delivery. In addition, this paper highlights some of the difficulties in under taking service user research and suggests recommendations as to how to overcome some of these complex issues