University of Warwick

About: University of Warwick is a education organization based out in Coventry, Warwickshire, United Kingdom. It is known for research contribution in the topics: Population & White dwarf. The organization has 26212 authors who have published 77127 publications receiving 2666552 citations. The organization is also known as: Warwick University & The University of Warwick.

Stomatal control of xylem embolism

Abstract: . The potential role of stomatal closure in the control of xylem embolism is investigated by means of a simple model of hydraulic flow in plants. Maintenance of a maximally efficient conducting system requires the stomata to close in an appropriate fashion as evaporative demand increases in order to prevent shoot water potentials falling below the threshold value at which cavitations occur. The model showed that the optimal stomatal behaviour required depends on soil water availability. Further analysis of the model demonstrated that there could be certain circumstances where loss of a proportion of the conducting tissue by embolisms can, perhaps surprisingly, be beneficial in terms of maximizing stomatal aperture and hence short-term productivity. The results are discussed in relation to the signals controlling stomatal aperture, and it is shown that (1) optimal control cannot be obtained using information on leaf water potential alone, and (2) information relating to soil water potential is a necessary requirement for optimal control.

The cerebral effects of ascent to high altitudes

Abstract: Cellular hypoxia is the common final pathway of brain injury that occurs not just after asphyxia, but also when cerebral perfusion is impaired directly (eg, embolic stroke) or indirectly (eg, raised intracranial pressure after head injury). We Review recent advances in the understanding of neurological clinical syndromes that occur on exposure to high altitudes, including high altitude headache (HAH), acute mountain sickness (AMS), and high altitude cerebral oedema (HACE), and the genetics, molecular mechanisms, and physiology that underpin them. We also present the vasogenic and cytotoxic bases for HACE and explore venous hypertension as a possible contributory factor. Although the factors that control susceptibility to HACE are poorly understood, the effects of exposure to altitude (and thus hypobaric hypoxia) might provide a reproducible model for the study of cerebral cellular hypoxia in healthy individuals. The effects of hypobaric hypoxia might also provide new insights into the understanding of hypoxia in the clinical setting.

Practice as the Site of Knowing: Insights from the Field of Telemedicine

Abstract: This paper aims to shift the unit of analysis in the study of organisational knowledge from individuals and their actions to practices and their relationships. It introduces the concept of “site” to help advance an understanding of the relationship between practice and knowing. The notion of site supports the intuition that knowing is both sustained in practice and manifests itself through practice. It also evokes the idea of knowledge as being rooted in an extended pattern of interconnected activities that only when taken in its living and pulsating entirety constitutes the site of knowing. In this paper, I review the different ways to conceptualise the relationships between knowing and practice, and I show how the idea of site adds to the existing body of work. Building on the results of a longitudinal study in the field of telemedicine, I then offer suggestions on aspects of practice where knowing manifests itself, and I use the concepts of “translation by contact” and “at distance” to explain how dispersed knowings are woven together and the power effect that can derive from these. I conclude by reflecting on the implications of this radical view and the direction for future research.

Altruism and Agency in the Family Firm: Exploring the Role of Family, Kinship, and Ethnicity:

Abstract: This article examines the relationship between altruism and agency costs in family business through an in-depth case study of a family firm. We found that altruism reduced agency costs in the early stages of the business, but that agency problems increased as the venture became larger and more established. Moreover, we suggest that altruistic behavior need not be confined to family and close kin, but may extend through networks of distant kin and ethnic ties. We thus present a more complex view of the agency relationship in family business than is often portrayed in the existing literature.

The Maximal Subgroups of the Low-Dimensional Finite Classical Groups

Abstract: This book classifies the maximal subgroups of the almost simple finite classical groups in dimension up to 12; it also describes the maximal subgroups of the almost simple finite exceptional groups with socle one of Sz(q), G2(q), 2G2(q) or 3D4(q). Theoretical and computational tools are used throughout, with downloadable Magma code provided. The exposition contains a wealth of information on the structure and action of the geometric subgroups of classical groups, but the reader will also encounter methods for analysing the structure and maximality of almost simple subgroups of almost simple groups. Additionally, this book contains detailed information on using Magma to calculate with representations over number fields and finite fields. Featured within are previously unseen results and over 80 tables describing the maximal subgroups, making this volume an essential reference for researchers. It also functions as a graduate-level textbook on finite simple groups, computational group theory and representation theory.