Pollen limitation may be a common Allee effect in marine hydrophilous plants: implications for decline and recovery in seagrasses.

Pollen limitation may be an important factor in accelerated decline of sparse or fragmented populations. Little is known whether hydrophilous plants (pollen transport by water) suffer from an Allee effect due to pollen limitation or not. Hydrophilous pollination is a typical trait of marine angiosperms or seagrasses. Although seagrass flowers usually have high pollen production, floral densities are highly variable. We evaluated pollen limitation for intertidal populations of the seagrass Zostera noltei in The Netherlands and found a significant positive relation between flowering spathe density and fruit-set, which was suboptimal at <1200 flowering spathes m(-2) (corresponding to <600 reproductive shoots m(-2)). A fragmented population had ≈35 % lower fruit-set at similar reproductive density than a continuous population. 75 % of all European populations studied over a large latitudinal gradient had flowering spathe densities below that required for optimal fruit-set, particularly in Southern countries. Literature review of the reproductive output of hydrophilous pollinated plants revealed that seed- or fruit-set of marine hydrophilous plants is generally low, as compared to hydrophilous freshwater and wind-pollinated plants. We conclude that pollen limitation as found in Z. noltei may be a common Allee effect for seagrasses, potentially accelerating decline and impairing recovery even after environmental conditions have improved substantially.

Integrative sediment assessment at Atlantic Spanish harbours by means of chemical and ecotoxicological tools.

This study refers to the integrative assessment of sediment quality in three harbour areas at the Spanish Atlantic Coast: Vigo (Northwestern Spain), Bilbao and Pasajes (Northern Spain). At each site, two lines of evidence have been considered: chemical analyses (metal, PAH and PCB concentrations in sediments and ammonia concentration in bioassays) and toxicity tests (Microtox®, Corophium sp. marine amphipod and Paracentrotus lividus sea urchin larvae). Chemical and ecotoxicological results have been integrated by means of a tabular matrix and a multivariate factorial analysis (FA). Highly toxic samples have been characterised in Vigo and Pasajes harbours while Bilbao samples present toxicity levels ranging from non-toxic to moderately toxic. High toxicity is associated with high levels of contaminants whereas confounding factors (ammonia, organic matter and mud) have been identified to be the main cause of low to moderate toxicity. Based on the obtained results, it can be concluded that deriving potential toxicity of sediments based on comparison with Sediment Quality Guidelines (SQGs) is in agreement to toxicity results in areas presenting high levels of contaminants. However, at lower levels of toxicity (low to moderate), the mismatch between the potential toxicity (SQG approach) and the toxicity measured by bioassays is greater, as the former only accounts for chemical concentrations, without considering the interaction between contaminants and the effect of confounding factors. Contrarily, the multivariate analysis seems to be a robust tool for the integration and interpretation of different lines of evidence in areas affected by different sources of contamination.

[Capecitabine: an oral chemotherapeutic agent against metastatic breast and colorectal cancer]. / Capecitabina: un quimioterápico oral en la lucha contra el cáncer de mama y colorrectal metastásico.

Capecitabine is the first drug in a new fluoropyrimidine class that offers distinct characteristics. On one hand its oral administration mimics continuous fluorouracil infusion while remaining convenient with higher patient acceptance and compliance rates and avoiding intravenous administration-associated complications and financial costs. On other hand it provides intra-tumour selective activation, thus potentially facilitating local management and therefore improved anti-tumour activity as well as reduced systemic toxicity. The concentration of thymidine phosphorylase an enzyme essential for capecitabine activation in tumour cells increases after exposure to cytotoxics such as taxanes, cyclophosphamide, gemcitabine or vinorelbine, which results in synergistic activity. It has been tried both as monotherapy and in combination with other chemotherapy agentsâboth in first-line regimes and in previously treated patients against metastatic colorectal and breast cancer, results being very good in terms of efficacy and tolerability.

[Literature review on the stability of diluted mixtures of cytostatic agents]. / Revisión bibliográfica de la estabilidad de las mezclas diluidas de citostáticos.

Up-to-date, evidence-based consensus protocols are an increasingly incorporated tool in health care. These protocols, clinical pathways, etc., represent a major support of health-care quality, namely scientific-technical quality. Compliance with these protocols by all team members guarantees that all patients be provided with an adequate level of health-care quality in the light of current knowledge and using available means. This principle of uniformity and quality in health care is essential for all, no matter the level of health care delivered or the activity being developed. In the Pharmacy Department and, more specifically, in the Unit of Cytostatic Agent Reconstitution and Dosing, knowledge and consensus on stability conditions and timing for diluted mixtures are essential to reach area-related quality standards. From literature references that are most relevant to or most widely used by in-hospital pharmacy departments, we designed a documented stabilities protocol to be used as a tool to: Augment preparation quality by including a documented expiry date within labels, optimize management on the basis of scientific criteria for mixtures not administered to patients and returned to the Pharmacy Department and design alternatives to hospitalization and outpatient delivery programs to improve end-user satisfaction and, therefore, health-care quality.

Application of Toxicity Identification Evaluation (TIE) procedures for the characterization and management of dredged harbor sediments.

This study refers to the performance of Phase I Toxicity Identification Evaluation (TIE) procedures to identify the contaminants (i.e. organic compounds, metals and ammonia) exerting toxicity in marine sediments from the Pasaia harbor (Oiartzun estuary, northern Spain). The effectiveness of the manipulations to reduce toxicity was proved with the marine amphipod survival test (whole-sediment) and the sea urchin embryo-larval assay (elutriates). By means of TIEs it was concluded that organic compounds were the major contaminants exerting toxicity, although toxic effects by metals was also demonstrated. Additionally, the combination of Phase I treatments allowed to investigate the toxicity changes associated to the mobility of contaminants during dredging activities. Therefore, the performance of TIE procedures as another line of evidence in the decision-making process is recommended. They show a great potential to be implemented at different steps of the characterization and management of dredged harbor sediments.

Metástasis pleural de un osteosarcoma: imagen gammagráfica / Pleural metastasis of an osteosarcoma: scintigraphic image

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