Fresenius Environmental Bulletin (FRESEN ENVIRON BULL )


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  • Fresenius Environmental Bulletin 01/2015;
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    ABSTRACT: A model based in an Artificial Neural Network (ANN) was developed in order to forecast the Olea airborne pollen concentration due to the allergenic power of its pollen grains. There were used daily data from Olea pollen and the main meteorological variables documented in the period 1993-2008. The model was carried out in the Spanish city of Ourense. The model was tested with data from 2009 and 2010, obtaining data with one day of anticipation. Obtained results could be employed in allergology and health sciences in order to prevent effect of pollinosis.
    Fresenius Environmental Bulletin 01/2015;
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    ABSTRACT: The effects of juvenile hormone analogue pyriproxyfen on total hemocyte count and hemocyte morphology of Galleria mellonella pupae were investigated. Pyriproxyfen was applied to last instar larvae of G. mellonella topically on the dorsal thorax. Five hemocyte types; prohemocytes, plasmotocyte, granulocyte, spherule cells and oenocytoids were identified in pupae hemolymph based on morphological criteria. A significant decrease was observed in total hemocyte count exposed to 1, 5 and 10 µg/ml of pyriproxyfen. Pyriproxyfen treatment caused different levels of deformations on almost all hemocyte types. Vacuolization in granulocytes, loss of pseudopod in plasmatocytes becoming round shaped, rarefaction in cytoplasm, forcing nucleus through the cell membrane were identified. Mitotic division and some cells lost their smooth cell boundary to become irregular were also determined as a result of toxic effects of pyriproxyfen. Our data demonstrated that pyriproxyfen influenced hemocyte count and morphology by deteriorating hormonal pathways even at low doses and it also indicates endocrine-immune system associations in insects.
    Fresenius Environmental Bulletin 01/2015; 24(2).
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    ABSTRACT: The present work addresses design aspects of soil remediation processes and suggests a rational well-spacing scheme to optimize the operational efficiency of systems and processes, considered in terms of pollute extracted per kW of mechanical power dissipated in pumps. The optimization scheme is proposed on the provisions of a universal map for steady-state two-phase flow in porous media, demarcating the process operational efficiency over the domain of the process operational parameters, i.e. the pollute/ water flow-rate ratio and the capillary number. Process efficiency is considered over a formation volume containing a single well. Pertinent DeProF2 model scaling law predictions for the reduced mechanical power dissipation are integrated across the formation control volume. Then, global values of energy utilization are estimated in terms of the process design parameters, i.e. the capillary number at the vicinity of the well-bore (Ca0), the duty oil/water flowrate ratio (r), and the radius of influence (ρc). Results indicate that, given the maximum permissible value of Ca0, the overall efficiency of the process is increased with decreasing ρc
    Fresenius Environmental Bulletin 12/2014; 23(11):2847-2851.
  • Fresenius Environmental Bulletin 12/2014;
  • Fresenius Environmental Bulletin 11/2014; 23(11a):2933-2938.
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    ABSTRACT: Biotic indices are commonly used in biomonitoring programs to assess the quality of surface waters. In the present study, a number of biotic indices based on benthic macroinvertebrates have been applied in assessing the water quality of a mountainous stream (Pelion, Central Greece). Samplings were done in summer and autumn 2012 in two sampling sites (Karamani, Servanates) using two sampling methods: (a) a standard pond net and (b) the Surber method. Invertebrate identification was performed to the family level. The Biological Monitoring Working Party (BMWP) score, the Average Score Per Taxa (ASPT), the Lincoln Quality Index, as well as the Iberian BMWP, and the Iberian ASPT were applied to the benthic macroinvertebrate samples to assess the water quality of each site. According to ASPT, IASPT and LQI, the biological water quality of both sampling sites was very good, regardless of the season and the sampling method used, with the exceptions of the summer samplings in Servanates with both sampling methods, and in Karamani with Surber, for which a good water quality was assessed with LQI and IASPT, respectively. In contrast, the BMWP and IBMWP scores for the sampling site Servanates were low, corresponding to fair water quality, but this effect was attributed to the particular hydrological conditions of this site. The sampling method did not significantly affect the sampling efficiency and, consequently, the results of the water quality evaluation.
    Fresenius Environmental Bulletin 11/2014; 23(11a):2904-2908.