Root growth and signalling: the role of calcium channels

Roots acquire calcium not only as a macronutrient but also to serve as a second messenger in signalling and a component of exocytosis for growth. Plasma membrane channels are sufficient to deliver calcium from the apoplast to the cytosol to enable its participation in nutrition, adaptation and development. The identity and regulatory mechanisms of these channels are central to our understanding of how calcium manages to “do it all”. By studying Arabidopsis roots, it’s been possible to discover plasma membrane channels involved in growth and signalling, allied to the finding that plants utilise the most damaging reactive oxygen species, the hydroxyl radical, constructively. As an overarching regulator, roots utilise extracellular purine nucleotides in a calcium-based signalling system that differs substantially from that of animals.Universidad de Málaga. Campus Internacional Andalucía Tec

‘Making the best of things’: relatives' experiences of decisions about care-home entry

Despite the growing awareness of the significance of helping a relative to relocate to a care home as a key phase in the care-giving career, relatively few British studies have explored this experience in depth. Informed by a constructivist perspective, this study sought a better understanding of nursing home placements from the viewpoint of relatives. Data were collected in 37 semi-structured interviews involving 48 people who had assisted a close relative to move into a nursing home. Analysis revealed three perceived phases to the transition: ‘making the best of it’, ‘making the move’ and ‘making it better’. The relatives' experiences through these phases had five perceived elements, all of which were continua, from absent to very strong, reflecting the extent to which they were felt. They were: operating ‘under pressure’ or not; ‘in the know’ or ‘working in the dark’; ‘working together’ or ‘working alone’; ‘in control of events’ or not, and ‘supported’ or ‘unsupported’ both practically and emotionally. This paper reports findings about the first phase of the transition, ‘making the best of it’, and documents the experiences of decision-making about nursing home placements. It is argued that health and social care practitioners have enormous potential to influence whether or not helping a relative to move into a nursing home is perceived as a positive choice

Women's birth experiences in Pakistan: the importance of the Dai

Aim: The aim of this paper is to present findings from a research study undertaken to explore women's life and birth experiences in Pakistan. Method: The design was ethnographic (Denzin, 1978) with an anthropological slant. Participant observation was undertaken in a maternity hospital in Pakistan and an over-50s luncheon club in the UK. Following two focus groups, in-depth interviews were undertaken with 16 women. Data were collected from observation, experience gained during nine field trips to Pakistan and the use of a reflective research diary. Findings/results: The main theme that emerged was the importance of the Dai (untrained traditional birth attendant) in women's accounts of their experiences. This theme included her influence on the women's birth experience and her work in the context of relatives and other health professionals. Other sub-themes not covered in this paper were boy preference, the omnipresent medical model, birth systems, the powerful symbolism of blood, purity shame and honour, and specifically from the women interviewed in the UK – coming to England and modernisation. Implications: The Dai was considered essential for the birth and currently 80% of all rural births are attended by Dai. However the medical professionals and policy-makers in Pakistan consider Dai practice to be dangerous and aim to establish systems for supervising and supporting skilled birth attendants, including the development of emergency referral services and a community midwife programme. Further research on women's experiences of birth in the home and hospital in Pakistan are necessary to inform government policy

Education for citizenship: the Joseph Rowntree Charitable Trust and the educational settlement movement

No abstract available

A three dimensional finite element model of wind effects upon higher harmonics of the internal tide.

A non-linear three dimensional unstructured grid model of the M2 tide in the shelf edge area off the west coast of Scotland is used to examine the spatial distribution of the M2 internal tide and its higher harmonics in the region. In addition the spatial variability of the tidally induced turbulent kinetic energy and associated mixing in the area are considered. Initial calculations involve only tidal forcing, although subsequent calculations are performed with up-welling and down-welling favourable winds in order to examine how these influence the tidal distribution (particularly the higher harmonics) and mixing in the region. Both short and long duration winds are used in these calculations. Tidal calculations show that there is significant small scale spatial variability particularly in the higher harmonics of the internal tide in the region. In addition turbulence energy and mixing exhibit appreciable spatial variability in regions of rapidly changing topography, with increased mixing occurring above seamounts. Wind effects significantly change the distribution of the M2 internal tide and its higher harmonics, with appreciable differences found between up- and down-welling winds, and long and short duration winds due to differences in mixing and the presence of wind induced flows. The implications for model validation, particularly in terms of energy transfer to higher harmonics, and mixing are briefly discussed

Parametric dictionary design for sparse coding

Abstract—This paper introduces a new dictionary design method for sparse coding of a class of signals. It has been shown that one can sparsely approximate some natural signals using an overcomplete set of parametric functions, e.g. [1], [2]. A problem in using these parametric dictionaries is how to choose the parameters. In practice these parameters have been chosen by an expert or through a set of experiments. In the sparse approximation context, it has been shown that an incoherent dictionary is appropriate for the sparse approximation methods. In this paper we first characterize the dictionary design problem, subject to a constraint on the dictionary. Then we briefly explain that equiangular tight frames have minimum coherence. The complexity of the problem does not allow it to be solved exactly. We introduce a practical method to approximately solve it. Some experiments show the advantages one gets by using these dictionaries