Local effects and global impact in neurotoxicity and neurodegeneration: The Xi"an International Neurotoxicology Conference

'Neurotoxicity and Neurodegeneration: Local Effect and Global Impact' was the theme of the Xi"an International Neurotoxicology Conference (XINC), held in Xi"an, June 2011. The Conference was a joint event of the 13th Biennial Meeting of the International Neurotoxicology Association (INA-13) and the 11th International Symposium on Neurobehavioral Methods and Effects in Occupational and Environmental Health (NEUREOH-11) of the Scientific Committee on Neurotoxicology and...

Local effects and global impact in neurotoxicity and neurodegeneration: The Xi"an International Neurotoxicology Conference

'Neurotoxicity and Neurodegeneration: Local Effect and Global Impact' was the theme of the Xi"an International Neurotoxicology Conference (XINC), held in Xi"an, June 2011. The Conference was a joint event of the 13th Biennial Meeting of the International Neurotoxicology Association (INA-13) and the 11th International Symposium on Neurobehavioral Methods and Effects in Occupational and Environmental Health (NEUREOH-11) of the Scientific Committee on Neurotoxicology and...

Entre la beneficencia y la «familiaritas»: la contratación del «victum et vestitum» en los monasterios catalanes durante los siglos XI-XII. Una respuesta institucional alternativa ante el hambre como problema social

Desde finales del siglo XI, en Cataluña, los principales monasterios y cabildos de canónigos regulares disponen de limosnas que ofrecen la ratio alimenticia diaria a pequeños grupos de laicos, diferenciados de los pobres, vinculados a ellas a través de actos de donación de alodios o de autodonación personal. En este artículo se aborda la relación entre el auge de este nuevo tipo de caridad contractual y de alguna de las formas de la familiaritas en las que derivó, y las dificultades de una parte de la sociedad durante las carestías, así como el papel que jugaron las principales instituciones monásticas, situadas al frente de importantes señoríos, a la hora de mitigar los efectos de éstas sobre la población dependiente.

La medina andalusina de Lleida en el segle XI: identitat i societat

La ciutat a Alandalús és l’espai hegemònic del poder públic emiral i posteriorment califal. Partint de la ciutat de Lleida, analitzem la evolució des del segle VIII fins al segle XI de la consolidació dels espais urbans com a representants del poder. Talment, aquests, capitalitzen els districtes o cores, mitjançant una xarxa de ciutats i fortificacions que li donen cohesió interna. Paral∙lelament, es vertebra i s’envigoritza una societat urbana partint d’elements comuns d’identitat i d’un discurs ideològic afí a la dinastia Omeia. La “gent de la ciutat” repre‐senten una part de la societat andalu‐sina, d’arrels hispano‐visigodes, i alhora, assumeixen l’hegemonia cultural de l’Islam, tot convivint en la nova realitat político‐social.

El món rural i urbà en la Lleida islàmica (S. XI-XII): Lleida i l'est del districte: Castelldans i el pla del Mascançà

Lleida i el seu territori s’integraren a Alandalús des del 713-714 fins al 1149. Durant aquest període força dilatat en la història, una civilització, la islàmica, ocupà i explotà el pai-satge que avui coneixem com les comarques del pla de Lleida. Certament, la seva empremta és ben visible en forma de to-pònims, fortaleses, eixos viaris, regadius, aliments i vocables que avui encara són usats. A més, si cal destacar una carac-terística de la societat islàmica lleidatana és la seva capacitat d’adaptar-se al medi natural i transformar-lo d’acord amb les seves necessitats culturals. Aquest llibre presenta les hipòtesis i conclusions de la recerca focalitzada en l’estudi del món urbà i rural islàmic del distric-te andalusí de Lleida. Concretament, s’ha centrat l’atenció a estudiar l’àrea de Castelldans i el pla del Mascançà.

The measurement of ice velocity, mass balance and thinning-rate on Johnsons Glacier, Livingston Island, South Shetland Islands, Antarctica

A network of twenty stakes was set up on Johnsons Glacier in order to determine its dynamics. During the austral summers from 1994-95 to 1997-98, we estimated surface velocities, mass balances and ice thickness variations. Horizontal velocity increased dow nstream from 1 m a- 1 near the ice divides to 40 m a- 1 near the ice terminus. The accumulation zone showed low accumulation rates (maximum of 0,6 m a- 1 (ice)), whereas in the lower part of the glacier, ablation rates were 4,3 m a- 1 (ice). Over the 3-year study period, both in the accumulation and ablation zones, we detected a reduction in the ice surface level ranging from 2 to 10 m from the annual ve rt ical velocities and ice-thinning data, the mass balance was obtained and compared with the mass balance field values, resulting in similar estimates. Flux values were calculated using cross-section data and horizontal velocities, and compared with the results obtained by means of mass balance and ice thinning data using the continuity equation. The two methods gave similar results.

Local effects and global impact in neurotoxicity and neurodegeneration: The Xi"an International Neurotoxicology Conference

'Neurotoxicity and Neurodegeneration: Local Effect and Global Impact' was the theme of the Xi"an International Neurotoxicology Conference (XINC), held in Xi"an, June 2011. The Conference was a joint event of the 13th Biennial Meeting of the International Neurotoxicology Association (INA-13) and the 11th International Symposium on Neurobehavioral Methods and Effects in Occupational and Environmental Health (NEUREOH-11) of the Scientific Committee on Neurotoxicology and...

Study of Johnsons Glacier (Livingston Island, Antarctica) by means of shallow ice cores and their tephra and by analysis of 137Cs content

With the aim of monitoring the dynamics of the Livingston Island ice cap, the Departament de Geodinàmica i Geofísica of the Universitat de Barcelona began ye a r ly surveys in the austral summer of 1994-95 on Johnsons Glacier. During this field campaign 10 shallow ice cores were sampled with a manual ve rtical ice-core drilling machine. The objectives were: i) to detect the tephra layer accumulated on the glacier surface, attributed to the 1970 Deception Island pyroclastic eruption, today interstratified; ii) to verify wheter this layer might serve as a reference level; iii) to measure the 1 3 7Cs radio-isotope concentration accumulated in the 1965 snow stratum; iv) to use the isochrone layer as a mean of verifying the age of the 1970 tephra layer; and, v) to calculate both the equilibrium line of the glacier and average mass balance over the last 28 years (1965-1993). The stratigr a p hy of the cores, their cumulative density curves and the isothermal ice temperatures recorded confi rm that Johnsons Glacier is a temperate glacier. Wi n d, solar radiation heating and liquid water are the main agents controlling the ve rtical and horizontal redistribution of the volcanic and cryoclastic particles that are sedimented and remain interstratified within the g l a c i e r. It is because of this redistribution that the 1970 tephra layer does not always serve as a ve ry good reference level. The position of the equilibrium line altitude (ELA) in 1993, obtained by the 1 3 7Cs spectrometric analysis, varies from about 200 m a.s.l. to 250 m a.s.l. This indicates a rising trend in the equilibrium line altitude from the beginning of the 1970s to the present day. The va rying slope orientation of Johnsons Glacier relative to the prevailing NE wind gives rise to large local differences in snow accumulation, which locally modifies the equilibrium line altitude. In the cores studied, 1 3 7Cs appears to be associated with the 1970 tephra laye r. This indicates an intense ablation episode throughout the sampled area (at least up to 330 m a.s.l), which probably occurred synchronically to the 1970 tephra deposition or later. A rough estimate of the specific mass balance reveals a considerable accumulation gradient related to the increase with altitude.

Hydrological evidence for a North Atlantic oscillation during the Little Ice Age outside its range observed since 1850.

An annual-resolved precipitation reconstruction for the last 800 yr in Southern Spain has been performed using stable carbon isotope (δ13C) of Pinus nigra tree rings. The reconstruction exhibits high- to low-frequency variability and distinguishes a Little Ice Age (LIA, AD 13501850) characterized by lower averaged rainfall than both in the transition from the Medieval Climate Anomaly to the LIA and in the 20th century. The driest conditions are recorded during the Maunder solar Minimum (mid 17thearly 18th centuries), in good agreement with the Spanish documentary archive. Similar linkage between solar activity (maximum/minimum) and precipitation (increase/decrease) is observed throughout the entire LIA. Additionally, the relationship between the hydrological pattern in the Iberian Peninsula and Morocco during the LIA suggests different spatial distribution of precipitation in the south-eastern sector of the North Atlantic region such as it is known currently. Whereas in the instrumental record the precipitation evolves similarly in both regions and opposite to the North Atlantic oscillation (NAO) index, the coldest periods of the LIA shows a contrasting pattern with drier conditions in the South of Spain and wetter in Northern Africa. We suggest an extreme negative NAO conditions, accompanied by a southward excursion of the winter rainfall band beyond that observed in the last century, can explain this contrast. The sustained NAO conditions could have been triggered by solar minima and higher volcanic activity during the LIA.

XI Jornada Tècnica de l'Arròs

La jornada tècnica de l’arròs es consolida com una plataforma per presentar els resultats dels últims assajos i projectes d’investigació que s’estan duent a terme al Delta de l’Ebre associats al cultiu. Per una altra banda, és un punt de trobada entre tècnics, empreses i arrossers que permet l’intercanvi d’experiències i opinions. Un any més, us animem a participar en aquesta jornada tècnica que abordarà una gran varietat de temes relacionats amb la sanitat vegetal, l’agronomia del cultiu i el medi ambient.