¿Qué nos dice Internet sobre la naturaleza del terrorismo yihadista?

En los últimos años ha tenido lugar un debate teórico de gran interés sobre la naturaleza organizacional del terrorismo yihadista y su evolución a lo largo de la última década. El centro de dicha discusión ha sido ocupado por dos profesores estadounidenses: Marc Sageman (2004; 2008) y Bruce Hoffman (2008). Mientras que el primero argumenta que la respuesta contraterrorista posterior al 11 de septiembre de 2001 ha originado que el control efectivo de las acciones terroristas se haya desplazado a un nivel de base, dando lugar a una yihad sin líderes donde los grupos terroristas juegan un papel secundario, el segundo sostiene que las organizaciones formales, y mas concretamente Al Qaeda Central, continua ejerciendo un grado sustancial de control estratégico y operativo. Los partidarios de una y otra visión han analizado los complots terroristas ejecutad os o desarticulados en los últimos tiempos, llegando a conclusiones diferentes sobre la naturaleza de los procesos de formación de las células terroristas, su vinculación con organizaciones, y cual es el principal perfil de la amenaza terrorista en Occidente: si el proveniente de células independientes y terroristas por imitación (bunchof guysy wannabessegún la terminología usada por Sageman), o el procedente de la acción de organizaciones formales de alcance global. El propósito de este trabajo es realizar una contribución a este debate académico aportando información procedente del ámbito de las actividades terroristas en Internet. Estos datos aportan nuevos elementos de análisis para el debate sobre la naturaleza organizacional de la amenaza yihadista.

Observació etnogràfica de la dimensió afectiva en una aula de primària

En aquest estudi s’analitza com es treballa la dimensió afectiva en l’ensenyament de segones llengües en una aula de primària a través dels cinc aspectes que hi intervenen: l’ambient d’aprenentatge, l’organització de la classe, la dinàmica de la classe, el rol del professor i la interacció a l’aula.

Statistical analysis of maximum likelihood estimator images of human brain FDG PET studies

The work presented evaluates the statistical characteristics of regional bias and expected error in reconstructions of real positron emission tomography (PET) data of human brain fluoro-deoxiglucose (FDG) studies carried out by the maximum likelihood estimator (MLE) method with a robust stopping rule, and compares them with the results of filtered backprojection (FBP) reconstructions and with the method of sieves. The task of evaluating radioisotope uptake in regions-of-interest (ROIs) is investigated. An assessment of bias and variance in uptake measurements is carried out with simulated data. Then, by using three different transition matrices with different degrees of accuracy and a components of variance model for statistical analysis, it is shown that the characteristics obtained from real human FDG brain data are consistent with the results of the simulation studies.

Identification of haptoglobin as an angiogenic factor in sera from patients with systemic vasculitis.

Angiogenesis is an important process in chronic inflammatory diseases. We observed that sera from patients with systemic vasculitis stimulated angiogenesis in an in vitro model using human umbilical vein endothelial cells cultured on a basement membrane (Matrigel) substrate. After 40% ammonium sulfate precipitation, angiogenic activity remained in the low molecular weight fraction and could be inactivated by heat. SDS-page of serum FPLC fractions exhibiting maximal angiogenic activity demonstrated two prominent species of 45 and 16-20 kD in patients' sera. These bands were much less apparent in sera obtained from control subjects. Amino-terminal sequencing of the 45-kD protein demonstrated that it was haptoglobin. Purified haptoglobin stimulated angiogenesis in a dose-dependent manner. The angiogenic activity of vasculitis patients' sera was partially inhibited by an antihaptoglobin antibody. Furthermore, serum haptoglobin levels in vasculitis patients correlated both with disease and angiogenic activity. Haptoglobin angiogenic activity was confirmed in two in vivo models using an implanted disc and a subcutaneous injection of basement membrane. Stimulation of angiogenesis is a newly recognized biological function of haptoglobin. The increased levels of haptoglobin found in chronic inflammatory conditions may play an important role in tissue repair. In systemic vasculitis, haptoglobin might also compensate for ischemia by promoting development of collateral vessels.

Personal constructs in systemic practice

This paper intends to elaborate the relationship between Kelly's Personal Construct Theory (PCT) and the systemic therapies beyond their notable similarities. Kelly's constructive alternativism is situated in the context of the current constructivist orientation that the family therapy movement seems to be adopting. A model of change is presented based on PCT's experience cycle. From this cycle, the relationship between behaviors and constructions is elaborated incorporating Procter's (52, 53) notions of the Family Construct System (FCS) andposition. This model allows for interventions both at behavioral and construction levels, as well as allowing for a certain technical eclecticism while, at the same time, retaining a strong theoretical coherence. This approach is discussed in the context of the debate about strategizing, power, and control held by authors such as Golann, Hoffman, and Tomm. Finally, some implications for research are outlined.