Las comunidades algales esciófilas en régimen relativamente calmado del litoral levantino.I. Comportamiento de los parámetros bionómicos y estructurales en función de la profundidad

Se estudian las comunidades algales esciófilas infralitorales en régimen relativamente calmado del litoral levantino (España, Mediterráneo), analizando los parámetros bionómicos y estructurales más representativos basados en el recubrimiento en proyección vertical para cada especie. Se analizan las fluctuaciones de dichos parámetros en función de la profundidad. Los resultados muestran que globalmente, la comunidad presenta una composición y estructura muy similar a la detectada en otros puntos del Mediterráneo occidental. Sin embargo, la distribución en el gradiente batimétrico de las especies cuantitativamente más representativas, sugiere la existencia de una zonación en el seno de las comunidades esciáfilas infralitorales.The sciaphilous infralitoral algal communities in relatively quiet enviroments of the levantine coast of Spain (Mediterranean), are Studied. Bionomical and structural parameters, based in the covering (vertical projection) for each species, are analized. The Fluctuations of this parameters in relation with depth are shown. Globaly, the community present a composition and structure typical of the Western Mediterranean. However, the distribution in the depth gradient of the species quantitatively more representatives suggests the existence of a zonation in the sciaphilous infralittoral [email protected]

Contribución al conocimiento algológico del litoral levantino. II

Siguiendo en la línea de trabajos anteriores (Boisset & Barceló, 1984; Boisset, 1986, 1987), damos a conocer algunas algas interesantes recogidas en el litoral levantino español, que constituyen nuevas citas de las cuales una lo es para el litoral mediterráneo español

Contribución al conocimiento algológico del litoral levantino (España, Mediterráneo) III

Se cita la presencia de 18 táxones de algas marinas interesantes procedentes del litoral levantino (España, Medinterráneo occidental). Veinticuatro constituyen nuevas citas para dicho tramo del litoral mediterráneo peninsular. Destaca la presencia de Peyssonnelia feldmannii, Ceramium fastigiatum var. flaccida, y Cystoseria sauvageauana va. polyoedematis.The records of 28 taxa of marine algae from the Central Mediterranean coast of Spain are given. 24 are new records for this sector of Spanish coast. Specilly interesting are Peyssonnelia codana, recorded for first time in the mediterranean coasts of Spain, Peyssonnelia feldmannii, Ceramium fastigiatum var. flaccida, y Cystoseria sauvageauana va. [email protected]

Contribución al conocimiento algológico del litoral levantino. I.

Se señalan doce especies de algas para el litoral Levantino, con referencias sobre su hábitat y aspectos fenológicos. Destacan Antithamnion antillanum y Pseudocrouania ischiana citadas por primera vez en el litoral mediterráneo español.Twelve taxa of marine algae from the eastern coast of Spain (Castellón, Valencia and Alicante) are listed, with references to their habitat and phenological aspects. Antithamnion antillanum y Pseudocrouania ischiana are news records for the Spanish mediterranean coast

The origin of blood stem cells

The development of cell biology research coincides with the advance of microscopes in the 19th century. It was finally possible to directly observe the various blood cell types and to witness their proliferation and differentiation (Mazzarello, 1999). On the basis of his observations, the German pathologist Franz E.C. Neumann (1834–1918) suggested that the site of blood formation was the bone marrow (BM). He also proposed the pioneer theory in which one cell might be at the origin of all blood cell lineages. The Russian scientist Alexander A. Maximow (1874–1928) also developed and introduced the theory of a common cell for the complete blood-building system or hematopoiesis (Maximow, 1909). The concept of Hematopoietic Stem Cells (HSCs), although very controversial at the time, was born and has led to the beginning of stem cell research (Ramalho-Santos and Willenbring, 2007)

First report from an advanced radiological inventory for a spent fuel reprocessing plant

With the development of the dismantling industry in a context of ever-stricter requirements for risk mastery techniques, strengthened means of radiological monitoring are sought. For obvious safety reasons it is, for example, impossible to pilot a dismantling worksite without a good knowledge of the quality and the level of source terms. Source term control is constantly improving throughout the life cycle of nuclear facilities, particularly thanks to new requirements in the dismantling industry. Scenario preparation and nuclear waste management at the factory level, strictly governed by safety rules, provide fertile ground for methodological or technical innovations. This means new combinations of data or the development of special detectors to locate or characterise radioactive sources in hostile environments, and enhanced means for detector positioning, in other words robots. This paper's objective is to illustrate the logic of these developments as implemented for the characterisation of a source term in a pilot reprocessing facility on the CEA's Marcoule site