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Agrandissement excessif

Case studies PCBs and organochlorine pesticides in Antarctic algae PCBs and organochlorine pesticides in shrimp from the Belgian North Sea Organochlorine pesticides in Harbour porpoises See also DDT on the ED North Database References ↑ Lawrence E (ed.), 2000. Henderson’s Dictionary of Biological Terms. 12th edition. Prentice Hall, Pearson Education Limited. Harlow, Great Britain. ↑ OSPAR Commission 2000. Quality Status Report 2000, OSPAR Commission, London ↑ Kennish, M. J. (1996): Practical Handbook of Estuarine and Marine Pollution, CRC Press 524 pp ↑ Janssen, C. (2008). Wat is giftig en wat niet, de zee onder de loep. Het Laboratorium voor Milieutoxicologie en Aquatische Ecologie, in: Goffin, A. et al. (Ed.) (2008). UGent aan Zee. pp. 54-61 The main author of this article is Daphnis De PooterPlease note that others may also have edited the contents of this article. Citation: Daphnis De Pooter (2020): DDT. Available from http://www.coastalwiki.org/wiki/DDT [accessed on 26-12-2024] For other articles by this author see Category:Articles by Daphnis De Pooter For an overview of contributions by this author see Special:Contributions/Daphnisd

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See also DDT on the ED North Database References ↑ Lawrence E (ed.), 2000. Henderson’s Dictionary of Biological Terms. 12th edition. Prentice Hall, Pearson Education Limited. Harlow, Great Britain. ↑ OSPAR Commission 2000. Quality Status Report 2000, OSPAR Commission, London ↑ Kennish, M. J. (1996): Practical Handbook of Estuarine and Marine Pollution, CRC Press 524 pp ↑ Janssen, C. (2008). Wat is giftig en wat niet, de zee onder de loep. Het Laboratorium voor Milieutoxicologie en Aquatische Ecologie, in: Goffin, A. et al. (Ed.) (2008). UGent aan Zee. pp. 54-61 The main author of this article is Daphnis De PooterPlease note that others may also have edited the contents of this article. Citation: Daphnis De Pooter (2020): DDT. Available from http://www.coastalwiki.org/wiki/DDT [accessed on 26-12-2024] For other articles by this author see Category:Articles by Daphnis De Pooter For an overview of contributions by this author see Special:Contributions/Daphnisd

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DDT affects the central nervous system of insects and other animals. This results in hyperactivity, paralysis and death. DDT also affects eggshell production in birds and the endocrine system of most animals[3].

Organochlorine pesticides in Harbour porpoises See also DDT on the ED North Database References ↑ Lawrence E (ed.), 2000. Henderson’s Dictionary of Biological Terms. 12th edition. Prentice Hall, Pearson Education Limited. Harlow, Great Britain. ↑ OSPAR Commission 2000. Quality Status Report 2000, OSPAR Commission, London ↑ Kennish, M. J. (1996): Practical Handbook of Estuarine and Marine Pollution, CRC Press 524 pp ↑ Janssen, C. (2008). Wat is giftig en wat niet, de zee onder de loep. Het Laboratorium voor Milieutoxicologie en Aquatische Ecologie, in: Goffin, A. et al. (Ed.) (2008). UGent aan Zee. pp. 54-61 The main author of this article is Daphnis De PooterPlease note that others may also have edited the contents of this article. Citation: Daphnis De Pooter (2020): DDT. Available from http://www.coastalwiki.org/wiki/DDT [accessed on 26-12-2024] For other articles by this author see Category:Articles by Daphnis De Pooter For an overview of contributions by this author see Special:Contributions/Daphnisd

Cam-follower mechanisms are particularly useful when a simple motion of one part of a machine is to be converted to a more complicated prescribed motion of another part, one that must be accurately timed with respect to the simple motion and may include periods of rest (dwells). The motion of the camshaft in an automobile engine, for example, is a simple rotation that bears a fixed ratio to the crankshaft speed, whereas the valve motion produced by the cams is accurately timed relative to the crankshaft rotation and includes dwells during which the valves remain closed. Cams are essential elements in automatic machine tools, textile machinery, sewing machines, printing machines, and many others. If the follower is not restrained by a groove on the cam, a spring is necessary to keep the follower in contact with the cam.

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References ↑ Lawrence E (ed.), 2000. Henderson’s Dictionary of Biological Terms. 12th edition. Prentice Hall, Pearson Education Limited. Harlow, Great Britain. ↑ OSPAR Commission 2000. Quality Status Report 2000, OSPAR Commission, London ↑ Kennish, M. J. (1996): Practical Handbook of Estuarine and Marine Pollution, CRC Press 524 pp ↑ Janssen, C. (2008). Wat is giftig en wat niet, de zee onder de loep. Het Laboratorium voor Milieutoxicologie en Aquatische Ecologie, in: Goffin, A. et al. (Ed.) (2008). UGent aan Zee. pp. 54-61 The main author of this article is Daphnis De PooterPlease note that others may also have edited the contents of this article. Citation: Daphnis De Pooter (2020): DDT. Available from http://www.coastalwiki.org/wiki/DDT [accessed on 26-12-2024] For other articles by this author see Category:Articles by Daphnis De Pooter For an overview of contributions by this author see Special:Contributions/Daphnisd

DDT has a very high tenancy towards biomagnification. When in a simple ecosystem the background concentration is equal to 1, then zooplankton can accumulate concentrations of 13.000, small fish species concentrations of 170.000, large fishes up to 670.000 and finally birds will accumulate concentrations up to 8.300.000[4]. DDT has been found in all marine ecosystems, including the Antarctic and the deep sea. It can be found in all components of the marine food web. Case studies PCBs and organochlorine pesticides in Antarctic algae PCBs and organochlorine pesticides in shrimp from the Belgian North Sea Organochlorine pesticides in Harbour porpoises See also DDT on the ED North Database References ↑ Lawrence E (ed.), 2000. Henderson’s Dictionary of Biological Terms. 12th edition. Prentice Hall, Pearson Education Limited. Harlow, Great Britain. ↑ OSPAR Commission 2000. Quality Status Report 2000, OSPAR Commission, London ↑ Kennish, M. J. (1996): Practical Handbook of Estuarine and Marine Pollution, CRC Press 524 pp ↑ Janssen, C. (2008). Wat is giftig en wat niet, de zee onder de loep. Het Laboratorium voor Milieutoxicologie en Aquatische Ecologie, in: Goffin, A. et al. (Ed.) (2008). UGent aan Zee. pp. 54-61 The main author of this article is Daphnis De PooterPlease note that others may also have edited the contents of this article. Citation: Daphnis De Pooter (2020): DDT. Available from http://www.coastalwiki.org/wiki/DDT [accessed on 26-12-2024] For other articles by this author see Category:Articles by Daphnis De Pooter For an overview of contributions by this author see Special:Contributions/Daphnisd

cam, machine component that either rotates or moves back and forth (reciprocates) to create a prescribed motion in a contacting element known as a follower. The shape of the contacting surface of the cam is determined by the prescribed motion and the profile of the follower; the latter is usually flat or circular.

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PCBs and organochlorine pesticides in shrimp from the Belgian North Sea Organochlorine pesticides in Harbour porpoises See also DDT on the ED North Database References ↑ Lawrence E (ed.), 2000. Henderson’s Dictionary of Biological Terms. 12th edition. Prentice Hall, Pearson Education Limited. Harlow, Great Britain. ↑ OSPAR Commission 2000. Quality Status Report 2000, OSPAR Commission, London ↑ Kennish, M. J. (1996): Practical Handbook of Estuarine and Marine Pollution, CRC Press 524 pp ↑ Janssen, C. (2008). Wat is giftig en wat niet, de zee onder de loep. Het Laboratorium voor Milieutoxicologie en Aquatische Ecologie, in: Goffin, A. et al. (Ed.) (2008). UGent aan Zee. pp. 54-61 The main author of this article is Daphnis De PooterPlease note that others may also have edited the contents of this article. Citation: Daphnis De Pooter (2020): DDT. Available from http://www.coastalwiki.org/wiki/DDT [accessed on 26-12-2024] For other articles by this author see Category:Articles by Daphnis De Pooter For an overview of contributions by this author see Special:Contributions/Daphnisd

Cams are made in a variety of forms, such as: (1) a rotating disk or plate with the required profile; (2) a plate with a groove cut on its face to fit a roller on the follower (face cam); (3) a cylindrical or conical member with a follower groove cut around the surface; (4) a cylinder with the required profile cut in the end (end cam); (5) a reciprocating wedge of the required shape.

DDT, like other organochlorine pesticides enter the marine environment mainly through inputs from water and air, as a result of their use in agriculture. Although the use of DDT in Western countries has been forbidden since the 1970's, they are still detected in the marine environment due to it's extreme stability (half-life of 15 years), to illegal use or to use elsewhere (third world countries). DDT is metabolised into dichlorodiphenyldichloroethylene (DDE) which is equally toxic. Therefore, to asses the risk of DDT exposure, the sum both contaminants needs to be taken into account. This also means that when you encounter a high DDT/DDE ratio, the contamination must be a recent one[2].

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