The filtration rate of zebra mussel Dreissena polymorpha used for water quality assessment in Dutch rivers. Kraak, M.H.S.; Kuipers, F.; Schoon, H.; Groot, CH.J.; Admiraal, W. Published in: Hydrobiologia DOI:10.1007/BF00017620 Link to publicationCitation for published version (APA): Kraak, M. H. S., Kuipers, F., Schoon, H., Groot, C. H. J., & Admiraal, W. (1994). The filtration rate of zebra mussel Dreissena polymorpha used for water quality assessment in Dutch rivers. Hydrobiologia, 294, 13-16. DOI: 10.1007/BF00017620 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Key words : zebra mussel, Dreissena polymorpha, filtration rate, water quality, rivers, metals Download date: 10 May 2018 AbstractThe effects of contaminated river water on the filtration rate of zebra mussels from a clean reference site were studied . After a 48-h exposure period to filtered water from the rivers Rhine, Meuse and Amstel (The Netherlands), the filtration rate was measured . It was demonstrated that water from contaminated locations inhibited the filtration rate . Inhibition was higher during low water levels in the rivers Rhine and Meuse than during high water levels, suggesting that contaminants are diluted during high water levels . It is concluded that the shortterm filtration-assay with D. polymorpha can be used for assessing water quality .

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Of 26 patients with dissecting aneurysm of the aorta diagnosed at the Henry Ford Hospital from 1950 through 1962, 13 patients lived less than six weeks from the time of initial diagnosis. Of the other 13 patients, 2 had had successful operative repair of the aneurysm during the acute stage. The average survival of the remaining 11 patients was 26 months. Prognosis of this unselected group of patients was better than has been reported previously for this disease. No significant correlation could be found between survival of the patient and the presence of past hypertension, associated recognized cardiovascular disease, or site of intimal rupture.

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