Stability of dissolved and soluble Fe(II) in shelf sediment pore waters and release to an oxic water column

Shelf sediments underlying temperate and oxic waters of the Celtic Sea (NW European Shelf) were found to have shallow oxygen penetrations depths from late spring to late summer (2.2–5.8 mm below seafloor) with the shallowest during/after the spring-bloom (mid-April to mid-May) when the organic carbon content was highest. Sediment porewater dissolved iron (dFe, 85%) consisted of Fe(II) and gradually increased from 0.4 to 15 μM at the sediment surface to ~100–170 µM at about 6 cm depth. During the late spring this Fe(II) was found to be mainly present as soluble Fe(II) (>85% sFe, 7 h. Iron(II) oxidation experiments in core top and bottom waters also showed removal from solution but at rates up to 5-times slower than predicted from theoretical reaction kinetics. These data imply the presence of ligands capable of complexing Fe(II) and supressing oxidation. The lower oxidation rate allows more time for the diffusion of Fe(II) from the sediments into the overlying water column. Modelling indicates significant diffusive fluxes of Fe(II) (on the order of 23–31 µmol m−2 day−1) are possible during late spring when oxygen penetration depths are shallow, and pore water Fe(II) concentrations are highest. In the water column this stabilised Fe(II) will gradually be oxidised and become part of the dFe(III) pool. Thus oxic continental shelves can supply dFe to the water column, which is enhanced during a small period of the year after phytoplankton bloom events when organic matter is transferred to the seafloor. This input is based on conservative assumptions for solute exchange (diffusion-reaction), whereas (bio)physical advection and resuspension events are likely to accelerate these solute exchanges in shelf-seas

Itinerário percorrido pelas mulheres na descoberta do câncer Camino recorrido por las mujeres en la descubierta del cáncer The journey experienced by women through a cancer diagnosis

Este estudo se propõe a desvelar o itinerário vivenciado pelas mulheres no processo de descoberta do diagnóstico de câncer. Como estratégia teórico-metodológica, foram utilizados o Interacionismo Simbólico e a Grounded Theory. Foram informantes do estudo 20 indivíduos 10 mulheres portadoras de câncer e seus respectivos familiares significantes. Os resultados mostram desde o momento em que elas vivenciam as primeiras percepções sobre a alteração fisiológica em seu corpo, passando pela busca de ajuda profissional, até o recebimento do diagnóstico de câncer. O itinerário apresentado permite conhecer aspectos da realidade experienciada anteriormente ao recebimento do diagnóstico e ressalta a importância de os profissionais valorizarem mais as queixas das pessoas que os procuram, percebendo que se esta procura aconteceu é porque a pessoa está preocupada. Esta atitude pode favorecer a identificação precoce do problema e, por conseguinte, garantir melhor prognóstico e qualidade de vida.<br>Este estudio propone revelar el camino vivido por las mujeres en el proceso de descubierta del diagnóstico de cáncer. Como estrategia teórico-metodológica fueron utilizados el Interaccionismo Simbólico y la Grounded Theory. Fueron investigados durante el estudio 20 individuos 10 mujeres portadoras de cáncer y sus respectivos familiares próximos. Los resultados muestran desde el momento en que ellas notan las primeras diferencias sobre la alteración fisiológica en su cuerpo, pasando por la búsqueda de ayuda profesional hasta el recibimiento del diagnóstico de cáncer. El camino presentado permite conocer aspectos de la realidad vivida anteriormente al recibimiento del diagnóstico y resalta la importancia de que los profesionales valoren más las quejas de las personas que los buscan, percibiendo que si esta búsqueda ocurrió es porque la persona está preocupada. Esta actitud puede facilitar la identificación precoz del problema y, por consiguiente, garantizar un mejor pronóstico y una mejor calidad de vida.<br>This study intends to reveal the journey experienced by women in the process of facing a cancer diagnosis. Symbolic Interactionism and Grounded Theory were used as theoretical-methodological strategies. Twenty individuals took part in the study - 10 female cancer bearers and their respective significant others. The results are described starting from the moment they experience their first perceptions of the physiologic changes in their bodies, through the search for professional help, to the acknowledgement of a cancer diagnosis. The given itinerary presents aspects of the patients' reality prior to the diagnosis, and emphasizes the importance of professionals giving more credence to the complaints of patients who seek them if the patient made an appointment, it is because that person is concerned. This attitude can promote the early identification of the problem, and consequently guarantee a better prognosis and quality of life