537 research outputs found
Measuring the Decline of a Marshallian Industrial District: The Birmingham Jewellery Quarter
No full textDe Propris L. and Lazzeretti L. Measuring the decline of a Marshallian industrial district: the Birmingham Jewellery Quarter, Regional Studies. This paper presents the findings of a study on the decline of a typical Marshallian industrial district: the Birmingham Jewellery Quarter in the UK. The paper contributes to the current debate on clusters' life cycle by presenting a multidisciplinary methodology that combines historical and economic analyses with demography and organizational ecology models. The paper seeks to explore the patterns of firms' birth and mortality rates, as well as firm density across branches of production activities to measure and understand the decline of the Jewellery Quarter over the last decades. [image omitted] De Propris L. et Lazzeretti L. Mesurer le declin d'un district industriel du type Marshall: le quartier de la bijouterie a Birmingham, Regional Studies. Cet article cherche a presenter les resultats provenant d'une etude au sujet du declin d'un district industriel du type Marshall: a savoir, le quartier de la bijouterie a Birmigham (R-U). L'article contribue au debat actuel sur le cycle de vie des regroupements d'entreprises, en presentant une methodologie pluridisciplinaire qui associe des analyses chronologiques et economiques aux modeles de la demographie et de l'ecologie organisationnelle. On cherche a etudier la structure des taux de naissance et de deces des entreprises, ainsi que la densite du parc d'entreprises a travers des branches d'activites de production afin de mesurer et comprendre le declin du quartier de la bijouterie pendant les decennies recentes. Districts industriels du type Marshall Cycle de vie des regroupements Theorie ecologique De Propris L. und Lazzeretti L. Messung des Niedergangs eines Marshallschen Industriedistrikts: das Juwelierviertel von Birmingham, Regional Studies. In diesem Artikel werden die Ergebnisse einer Studie uber den Niedergang eines typischen Marshallschen Industriedistrikts vorgestellt, namlich des Juwelierviertels von Birmingham (GB). Der Artikel versteht sich als Beitrag zur aktuellen Debatte uber den Lebenszyklus von Clustern; hierfur prasentieren wir eine multidisziplinare Methodologie, in der historische und okonomische Analysen mit demografischen und organisationellen Okologiemodellen kombiniert werden. Wir untersuchen die Muster der Raten von Firmengrundungen und -schliessungen sowie die Firmendichte in verschiedenen Branchen der produzierenden Industrie, um den Niedergang des Juwelierviertels in den letzten Jahrzehnten zu messen und zu verstehen. Marshallsche Industriedistrikte Lebenszyklus von Clustern Okologische Theorie De Propris L. y Lazzeretti L. Medicion del declive de un distrito industrial marshalliano: el Jewellery Quarter de Birmingham, Regional Studies. En este articulo presentamos los resultados de un estudio sobre el declive de un distrito industrial marshalliano tipico: el Jewellery Quarter (barrio de las joyas) en Birmingham (RU). Aqui contribuimos al debate actual sobre el ciclo de vida de las aglomeraciones presentando una metodologia multidisciplinaria que combina los analisis historicos y economicos con los modelos demograficos y la ecologia organizativa. Lo que pretendemos es analizar los patrones de tasas de nacimientos y mortalidad de las empresas, asi como su densidad en todos los sectores de las actividades de produccion para medir y entender el declive del Jewellery Quarter en las ultimas decadas. Distritos industriales marshallianos Ciclo de vida de aglomeracion y teoria ecologicaMarshallian industrial districts, Cluster life cycle, Ecological theory,
Il requisito dimensionale alla prova delle riforme del mercato del lavoro
No full textL'autore ricapitola e studia l'onore della prova del requisito dimensional
Brightest cluster galaxies: The centre can(not?) hold
No full textWe explore the persistence of the alignment of brightest cluster galaxies (BCGs) with their local environment. We find that a significant fraction of BCGs do not coincide with the centroid of the X-ray gas distribution and/or show peculiar velocities (they are not at rest with respect to the cluster mean). Despite this, we find that BCGs are generally aligned with the cluster mass distribution even when they have significant offsets from the X-ray centre and significant peculiar velocities. The large offsets are not consistent with simple theoretical models. To account for these observations BCGs must undergo mergers preferentially along their major axis, the main infall direction. Such BCGs may be oscillating within the cluster potential after having been displaced by mergers or collisions, or the dark matter halo itself may not yet be relaxed.Fil: de Propris, Roberto. University of Turku; FinlandiaFil: West, Michael J.. Lowell Observatory; Estados UnidosFil: Andrade-Santos, Felipe. Harvard-Smithsonian Center For Astrophysics; Estados UnidosFil: Ragone Figueroa, Cinthia Judith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: Rasia, Elena. Istituto Nazionale di Astrofisica; ItaliaFil: Forman, William. Harvard-Smithsonian Center For Astrophysics; Estados UnidosFil: Jones, Christine. Harvard-Smithsonian Center For Astrophysics; Estados UnidosFil: Kipper, Rain. University Of Tartu. Faculty Of Science And Technology. Tartu Observatory.; EstoniaFil: Borgani, Stefano. Istituto Nazionale di Astrofisica; ItaliaFil: Garcia Lambas, Diego Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: Romashkova, Elena A.. Massachusetts Institute Of Technology. Department Of Physics; Estados UnidosFil: Patra, Kishore C.. University of California; Estados Unido
The rest-frame K-band luminosity function of galaxies in clusters to z = 1.3
No full textWe derive the rest-frame K-band luminosity function for galaxies in 32 clusters at 0.6 < z < 1.3 using deep 3.6 {micro}m and 4.5 {micro}m imaging from the Spitzer Space Telescope InfraRed Array Camera (IRAC). The luminosity functions approximate the stellar mass function of the cluster galaxies. Their dependence on redshift indicates that massive cluster galaxies (to the characteristic luminosity M*{sub K}) are fully assembled at least at z {approx} 1.3 and that little significant accretion takes place at later times. The existence of massive, highly evolved galaxies at these epochs is likely to represent a significant challenge to theories of hierarchical structure formation where such objects are formed by the late accretion of spheroidal systems at z < 1
Disentangling star formation and merger growth in the evolution of luminous red galaxies
No full textEvaluation of marrow and blood haemopoietic progenitors in chronic lymphocytic leukaemia before and after chemotherapy.
No full textWe have evaluated the number and differentiation pattern of CD34(+) cells, as well as the CFU-GM, BFU-E and CFU-GEMM progenitors from the blood (PB) and marrow (BM) of 53 chronic lymphocytic leukaemia (CLL) patients. Twenty-four patients were untreated and 29 were studied at 2 months from the last course of fludarabine or chlorambucil; 6 patients, studied after fludarabine therapy, were further evaluated after mobilization with cyclophosphamide and G-CSF PB of untreated patients showed a median number of CD34(+) cells, CFU-GM, BFU-E and CFU-GEMM/10(5) seeded cells and per litre of PB similar to those of normal controls. No differences were also found in the number of clonogenic progenitors/10(5) cells in patients studied before and after therapy, while significantly fewer BFU-E/l of PB were found after fludarabine. The number of circulating CD34(+) cells/l of PB was significantly lower in patients treated with fludarabine or chlorambucil compared to untreated patients. BM growth was significantly reduced in untreated CLL patients compared to healthy donors. Treatment with fludarabine or chlorambucil restored BM progenitors at levels similar to those of normal controls; this effect did not occur for CFU-GM in patients treated with fludarabine. Three-colour fluorescence analysis demonstrated a differentiation pattern of CD34(+) cells, with a greater expression of CD13 and CD33 after treatment with fludarabine compared to untreated patients and normal controls. In 4 patients previously treated with fludarabine who underwent a successful cyclophosphamide and G-CSF mobilization therapy, 4x10(6) CD34+ cells/kg were collected. These 4 patients showed a notable increase of CD34(+) cells and of clonogenic cells in the PB, but a marked decrease of BM progenitor cells. The 2 patients who failed CD34(+) cell mobilization had a reduced CFU-GM growth both in the PB and in the BM. Taken together, these studies indicate that residual haemopoietic progenitors are present in untreated CLL patients and that stem cell mobilization and collection can be carried out following fludarabine treatment
Galaxy and Mass Assembly (GAMA) : merging galaxies and their properties
No full textWe derive the close pair fractions and volume merger rates for galaxies in the Galaxy and Mass Assembly (GAMA) survey with -23 <M-r <-17 (Omega(M) = 0.27, Omega(A) = 0.73, H-0 = 100 km s(-1) Mpc(-1)) at 0.01 <z <0.22 (look-back time of <2 Gyr). The merger fraction is approximately 1.5 per cent Gyr(-1) at all luminosities (assuming 50 per cent of pairs merge) and the volume merger rate is approximate to 3.5 x 10(-4) Mpc(-3) Gyr(-1). We examine how the merger rate varies by luminosity and morphology. Dry mergers (between red/spheroidal galaxies) are found to be uncommon and to decrease with decreasing luminosity. Fainter mergers are wet, between blue/discy galaxies. Damp mergers (one of each type) follow the average of dry and wetmergers. In the brighter luminosity bin (-23 <M-r <-20), the merger rate evolution is flat, irrespective of colour or morphology, out to z similar to 0.2. The makeup of the merging population does not appear to change over this redshift range. Galaxy growth by major mergers appears comparatively unimportant and dry mergers are unlikely to be significant in the buildup of the red sequence over the past 2 Gyr. We compare the colour, morphology, environmental density and degree of activity (BPT class, Baldwin, Phillips & Terlevich) of galaxies in pairs to those of more isolated objects in the same volume. Galaxies in close pairs tend to be both redder and slightly more spheroid dominated than the comparison sample. We suggest that this may be due to 'harassment' in multiple previous passes prior to the current close interaction. Galaxy pairs do not appear to prefer significantly denser environments. There is no evidence of an enhancement in the AGN fraction in pairs, compared to other galaxies in the same volume.Peer reviewe
SUDDEN BLASTIC CRISIS (BC) IN CML PH+ PATIENTS IN COMPLETE CYTOGENETIC REMISSION (CCR) INDUCED BY IMATINIB
No full textLE ANTENNE DEI PAUSSINAE(COLEOPTERA:CARABIDAE): ADATTAMENTI FUNZIONALI ALLA MIRMECOFILIA
No full text- …
