Difference between revisions of "Portal:Ecotox/Intro"

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<u>'''Everyting is toxic...'''</u>
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<u>'''Everything is toxic...'''</u>
  
The founder of toxicology, Paracelsus (1493 - 1541) is most famous for his quote “'''All things are poison and nothing is without poison, only the dose permits something not to be poisonous'''”. With this he indicated that in sufficiently large doses all substances can be toxic. So can even water be lethal if it’s drunk in too large amounts. Salt can be poisonous as well if one eats mutable table spoons of it at once.  
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The founder of toxicology, Paracelsus (1493 - 1541) is most famous for his quote “'''All things are poison and nothing is without poison, only the dose permits something not to be poisonous'''”. With this, he indicated that in sufficiently large doses all substances can be toxic. So, even water can be lethal if it’s drunk in too large amounts. Salt can be poisonous as well if one eats multiple table spoons of it at once.  
 
These examples show that toxicity is relative, it doesn’t only depend on the harmful characteristics of a substance, but also on the level at which an organism was exposed to it.
 
These examples show that toxicity is relative, it doesn’t only depend on the harmful characteristics of a substance, but also on the level at which an organism was exposed to it.
 
At present there are about 100,000 chemicals known which might cause harm to humans or the environment.
 
At present there are about 100,000 chemicals known which might cause harm to humans or the environment.
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Lab analysis of chemicals </div>]]
 
Lab analysis of chemicals </div>]]
  
Ecotoxicology is the study of the harmful effects that chemical substances can have on living organisms and the environment. Information on the occurrence of chemicals and their effects on the environment provides an indication of the [[pollution]] level and associated [[Environmental risk assessment of marine activities|risks]]. Living organisms can accumulate certain chemicals in their bodies, which is called [[bioaccumulation]]. [[bioaccumulation|Bioaccumulating]] substances can reach very high concentrations in predators through a process called [[biomagnification]]. <br><p>Usually lab experiments are conducted to expose different types of organisms to the chemical of interest. These experiments provide insights on how the chemical affects an organism, a community or an [[ecosystem]]. Additional field studies provide more information on its effects in more natural conditions. From these experiments can be estimated which is the “safe concentration” of a chemical: the highest concentration of the chemical that doesn’t cause negative effects in the ecosystem.
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Ecotoxicology is the study of the harmful effects that chemical substances can have on living organisms and the environment. Information on the occurrence of chemicals and their effects on the environment provides an indication of the [[pollution]] level and associated [[Environmental risk assessment of marine activities|risks]]. Living organisms can accumulate certain chemicals in their bodies, which is called [[bioaccumulation]]. [[bioaccumulation|Bioaccumulating]] substances can reach very high concentrations in predators through a process called [[biomagnification]]. <br><p>Usually lab experiments are conducted to expose different types of organisms to the chemical of interest. These experiments provide insights on how the chemical affects an organism, a community or an [[ecosystem]]. Additional field studies provide more information on its effects in more natural conditions. These experiments allow to estimate the “safe concentration” of a chemical: the highest concentration of the chemical that doesn’t cause negative effects in the ecosystem.
 
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<p>
  
 
'''<u>Purpose of the portal</u>'''
 
'''<u>Purpose of the portal</u>'''
 
<P>
 
<P>
This portal has been set up for a broad public. Its purpose is to inform about and to clarify recent Belgian (and some Dutch) research related to marine ecotoxicology.
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This portal aims to reach a broad public. It intents to discuss and to clarify recent Belgian (and some Dutch) research related to marine ecotoxicology.
 
Through [[Portal:Ecotox/News|case studies]] at different [[Trophic_level_-_a_marine_example|trophic]] levels you will get acquainted with different groups of toxic substances and their effects on marine and [[estuary|estuarine]] organisms.
 
Through [[Portal:Ecotox/News|case studies]] at different [[Trophic_level_-_a_marine_example|trophic]] levels you will get acquainted with different groups of toxic substances and their effects on marine and [[estuary|estuarine]] organisms.
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[[Image:INRAMlogo.jpg||70px| <div style="text-align: center;"> Lab analysis of chemicals </div>]][[Image:logo_tox.jpg||90px| <div style="text-align: center;">Laboratory of Environmental Toxicology and Aquatic Ecology</div>]][[Image:Belspo 07 left.jpg|130px| <div style="text-align: center;">Belgian Science Policy</div>]]

Revision as of 13:38, 13 January 2012

Paracelsus (1493 - 1541)

Everything is toxic...

The founder of toxicology, Paracelsus (1493 - 1541) is most famous for his quote “All things are poison and nothing is without poison, only the dose permits something not to be poisonous”. With this, he indicated that in sufficiently large doses all substances can be toxic. So, even water can be lethal if it’s drunk in too large amounts. Salt can be poisonous as well if one eats multiple table spoons of it at once. These examples show that toxicity is relative, it doesn’t only depend on the harmful characteristics of a substance, but also on the level at which an organism was exposed to it. At present there are about 100,000 chemicals known which might cause harm to humans or the environment.

Ecotoxicology

Lab analysis of chemicals
Ecotoxicology is the study of the harmful effects that chemical substances can have on living organisms and the environment. Information on the occurrence of chemicals and their effects on the environment provides an indication of the pollution level and associated risks. Living organisms can accumulate certain chemicals in their bodies, which is called bioaccumulation. Bioaccumulating substances can reach very high concentrations in predators through a process called biomagnification.

Usually lab experiments are conducted to expose different types of organisms to the chemical of interest. These experiments provide insights on how the chemical affects an organism, a community or an ecosystem. Additional field studies provide more information on its effects in more natural conditions. These experiments allow to estimate the “safe concentration” of a chemical: the highest concentration of the chemical that doesn’t cause negative effects in the ecosystem.

Purpose of the portal

This portal aims to reach a broad public. It intents to discuss and to clarify recent Belgian (and some Dutch) research related to marine ecotoxicology. Through case studies at different trophic levels you will get acquainted with different groups of toxic substances and their effects on marine and estuarine organisms.

 Lab analysis of chemicals Laboratory of Environmental Toxicology and Aquatic EcologyBelgian Science Policy