56 resultados para Apical third


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In 1997, New Labour set about the task of reforming public services in the United Kingdom through the use of an ideology that became known as the ‘Third Way’. This research examines the context from which this concept emerged, and explores its relationship with the tools of delivery, with particular reference to the Private Finance Initiative (PFI). The paper begins by reviewing the Third Way, before analysing the arguments for and against PFI. Using an example from the Northern Ireland education sector, the paper argues that the characteristics associated with the Third Way are mirrored in the operational tools of public service delivery, such as PFI. The paper concludes that, within the context of the case study reviewed, there is a ‘consistent pragmatism’ in play in relation to how these delivery initiatives are operated and how they relate to their conceptual underpinnings.

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The EU’s Peace programmes in Ireland have promoted the cross-border activity of Third sector groups. Potentially, such activity gives substantive meaning to regional cross-border governance and helps to ameliorate ethno-national conflict by providing positive sum outcomes for ‘post-conflict’ communities. The paper mobilizes focused research conducted by the authors to explore this potential. It finds that while regional cross-border governance has indeed developed under the Peace programmes, the sustainability of the social partnerships underpinning this governance is uncertain and its significance for conflict resolution is qualified by difficulties in forming a stable power-sharing arrangement at the political elite level.

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As the state of the art for high power laser systems increases from terawatt to petawatt level and beyond, a crucial parameter for routinely monitoring high intensity performance is laser spot size on a solid target during an intense interaction in the tight focus regime ( 10(19) Wcm(-2) is demonstrated experimentally and shown to provide the basis for an effective focus diagnostic. Importantly, this technique is also shown to allow in-situ diagnosis of focal spot quality achieved after reflection from a double plasma mirror setup for very intense high contrast interactions (> 10(20) Wcm(-2)) an important application for the field of high laser contrast interaction science.

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Vegetative and reproductive development of some European and Californian species of Laurencia Lamouroux (Ceramiales, Rhodophyta), L. obtusa (Hudson) Lamouroux, L. spectabilis Postels et Ruprecht, L. crispa Hollenberg, L. osmunda (S.G. Gmelin) Maggs et Hommersand, L. pinnatifida (Hudson) Lamouroux and L. truncata Kutzing, is investigated on the basis of liquid-preserved and herbarium specimens. The latter five species share several features, but they differ distinctly from L. obtusa, the lectotype of the genus, in essential anatomical characters of vegetative and male reproductive structures and tetrasporangial development. In these five species each vegetative axial segment produces two rather than four pericentral cells, and spermatangial branches (filaments) are produced in apical pits of branchlets from apical and epidermal cells rather than from trichoblasts arising from axial cells. The spermatangial branches are usually branched alternately and usually terminate in a cluster of several large sterile vesicular cells, rather than being branched dichotomously and terminating in a single, or occasionally a row of two, large sterile vesicular cells as in L. obtusa. Apical spermatangial pits of fertile male branchlets (except for those in L. truncata) are pocket- (or urn)-shaped, with an ostiole-like upper opening, rather than cup- (or bowl)-shaped. In these five species tetrasporangia are produced laterally from random epidermal cells rather than abaxially from particular pericentral cells (the third and fourth ones) as in L. obtusa, and the two presporangial cover cells are aligned parallel rather than transverse to the stichidial axis in surface view. These important differences strongly suggest that L. spectabilis, L. crispa, L. osmunda, L. pinnatifida and L. truncata occupy a phylogenetically different position from L. obtusa, and lead to the conclusion that the genus Osmundea Stackhouse, which was based on 0. expansa Stackhouse, nom. illeg. (= Laurencia osmunda) and which has been a nomen rejiciendum as an earlier facultative synonym of Laurencia, should be resurrected. Emendations of the generic criteria of Laurencia and Osmundea are proposed here, and relevant nomenclatural changes for several Laurencia species are also included.