134 research outputs found
Description of Byspira polyomma n.sp. (Annelida:Sabellidae):a probabile introduction to The Netherland
No full textBispira polyomma sp. nov. is described. The taxon was recently found on the SW coast of The Netherlands (NE Atlantic), and
could not be referred to as any previously described species of the genus Bispira. The area has been thoroughly investigated in
the past, therefore we hypothesize the species is a new introduction to The Netherlands. The tubeworm is able to settle massively
on all kinds of hard substrates, is eurythermal and able to withstand slight pollution, and therefore wider dispersal is a possibility
to reckon with. For this reason we give a taxonomic species description even though the genus needs further revision. Presently
the taxon has been observed only near Yerseke, a centre of shellfish culture and trade with a marina. The taxon was found in
2010. Subsequent surveys revealed a very dense population had developed in 2011, with the presence of small individuals in
summer 2011 suggesting successful reproduction
Freshwater immersion as a method to remove Urosalpinx cinerea and Ocinebrellus inornatus from mussel seed
No full textA simple experiment to test whether immersion in freshwater for ≤24 hours would kill two oyster drills, Urosalpinx cinerea and Ocinebrellus inornatus was conducted to test the proposal of using freshwater to rid mussel seed of the drills before translocation from the Oosterschelde to the Wadden Sea. Freshwater failed to kill any individuals of either species, but did cause them to detach from the substratum for the entire time of immersion. Immersion in freshwater is therefore not recommended as a method to control the drills. Rinsing in freshwater may be an option to remove the drills without killing them, but has no guarantee of 100 % success. Further investigation may result in the development of other treatment options
Naamlijst van de mariene snoerwormen van Nederland, met vijf nieuwe soorten (Nemertea)
No full textWe present an updated list of marine nemertean species from the Netherlands. Eleven species not mentioned in the previous list (Faasse 2003) are briefly discussed, and we report five newrecords for the Netherlands, Cerebratulus spec. Riseriellus occultus, Amphiporus bioculatus,Psammamphiporus elongates and Tetrastemma melanocephalum These are all species of soft sediments which are not identified to the species level in standard monitoring programmes,due to fixation in formol. Identification using live nemerteans is recommended. As microbenthic predators with a relatively high consumption rate, they may play significant roles infood webs. All nemertean species are probably under-recorded internationally
Naamlijst van de mariene snoerwormen van Nederland, met vijf nieuwe soorten (Nemertea)
No full textWe present an updated list of marine nemertean species from the Netherlands. Eleven species not mentioned in the previous list (Faasse 2003) are briefly discussed, and we report five newrecords for the Netherlands, Cerebratulus spec. Riseriellus occultus, Amphiporus bioculatus,Psammamphiporus elongates and Tetrastemma melanocephalum These are all species of soft sediments which are not identified to the species level in standard monitoring programmes,due to fixation in formol. Identification using live nemerteans is recommended. As microbenthic predators with a relatively high consumption rate, they may play significant roles infood webs. All nemertean species are probably under-recorded internationally
Unravelling the practical solar charging performance limits of redox flow batteries based on a single photon device system
No full textIn recent years, solar redox flow batteries have attracted attention as a possible integrated technology for simultaneous conversion and storage of solar energy. Unlike solar water splitting technologies which require at least 1.8V for meaningful performance, a lesson learned from previous solar redox flow battery (SRFB) studies is that even single-photon-devices can demonstrate unbiased photo-charging owing to the flexibility of redox couple selection. Thus, in this paper, we present the theoretical model reflecting experimental parameters, such that we can highlight important parameters that merit the most attention in further studies towards the practical development of SRFBs. Importantly, the results clearly show how to choose the optimum combination of semiconductor and redox couples under unavoidable limitations that a practical system would encounter, including, but not limited to optical loss by the electrolyte, overpotential, device architecture and chemical potentials.Accepted Author ManuscriptChemE/Materials for Energy Conversion and Storag
How distressing is it to participate in medical research? A calibration study using an everyday events questionnaire
No full textObjectives: To investigate how distressing participating in medical research is perceived to be, compared to everyday events. Design: Anonymous questionnaire. Setting: Scotland and New Zealand. Participants: One hundred members of the Scottish general public, 94 University of Auckland students, 22 New Zealand Ministry of Health ethics committee members. Main outcome measures: Distress ratings made on a 0-10 scale for everyday events and common medical research procedures. Results: Both general population and student samples generally rated the distress caused by participating in various medical research procedures as low or very low. Most research procedures were rated less than the distress caused by not being able to find a car park at a supermarket. In contrast, the ethics committee members rated the distress caused by most of the medical research procedures at a significantly higher level than the ratings of the student and general population samples. Ethics committee members overestimated the distress caused by interview or questionnaire assessments (M = 203.31%, SE = 11.42, 95% CI [179.79, 226.83]) more than medical testing for research (M = 158.06%, SE = 12.33, 95% CI [132.66, 183.46], p = 0.04) and everyday events (M = 133.10%, SE = 7.80, 95% CI [117.03, 149.16], p < 0.001). Conclusions: Common medical research procedures are not rated as particularly distressing by the general public, and ethics committees may be adopting an over-protective role when evaluating research applications that involve the use of questionnaire or survey methodology
Theoretical & Experimental Analysis of PEC Redox Flow Battery Kinetics
No full textThe transition from stable fossil fuel energy production to intermittent renewable sources poses a huge challenge to our generation. The mismatch between electricity supply and demand will become an increasinglypressing problem, due to the growing share of renewable energy production and the electrification of the automotive industry. The upcoming field of Solar Redox Flow Batteries (SRFB) proposes a possible solution in the search for feasible energy storage. Integrating a photovoltaic module with a redox flow battery results in a highly reversible storage system, which has both the advantage of flexibility in capacity and charge/discharge power, as well as the direct and efficient coupling to solar energy generation. However, due to its early stage in development, the SRFB has several challenges to overcome, like low charging efficiencies and energy densities. To improve SRFB efficiency, this work provides a performance estimation model, to identify general sensitivities of SRFB efficiency with respect to the loss mechanisms associated with the device, such as (but not limited to) kinetic overpotentials and resistances, to establish device design principles. This model is also extended to simulate realistic environments, using real (daily/seasonally dependent) solar radiation and ambient temperature data. Moreover, a fit tool is realized to identify losses in a specific system, by varying parameters and mimicking experimental linear scan voltammetry data. Experimentally, several conducting layers are tested for their kinetics and conductivity and impact on device performance. A thin film of platinum is found to result in the best kinetics and lowest resistance. However, carbon-coated electrodes also show promising results and could be a feasible and cheaper alternative to platinum, when applying layer-optimization. Based on the design principles derived from the modeled and experimental results, a single-junction siliconbased SRFB is developed, based on a ferri-/ferrocyanide electrolyte, coupled with Cu2+=+, yielding high solar-to-chemical charging efficiency of 9.4%. This efficiency is close to the simulated efficiency, while multiple other SRFB photo-charging experiments follow modeled trends, validating the model.Applied Physic
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