Scientists now believe the birds had consumed domoic acid, a toxin found in algae that had gotten into their diet.
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In an oxygen-free (anaerobic) environment at a certain temperature, pH and salinity, the bacteria can produce a toxin that in very small amounts can cause life-threatening paralysis.
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As the heart of America's petrochemical and oil-refining industries, Texas puts more chemicals into the air than any other state, and by most rankings is the state with the worst toxin level in the atmosphere.
Law enforcement agents should be able to test the toxin found in the letters to determine its potency and purity, as well as learn what chemicals may have been used to extract it from widely available castor beans, said Murray Cohen, the founder of the Atlanta-based Frontline Foundation, which trains workers on preparedness and response to bioterrorism and epidemics.
Giery said the hospital's diagnosis at the time of death was that his illness was caused by food poisoning from ciguatera, a toxin sometimes found in large saltwater fish including grouper, red snapper and sea bass.
Telecommuting when possible, working in outdoor areas, or bringing toxin-sucking plants to the office can all reduce the quantity of exposure to such chemicals.
The toxin from the pufferfish was found in two different mixtures.
Measurements in 2011 found that concentrations of a liver toxin they produce were hundreds of times higher than levels approved by the World Health Organization for drinking and recreational waters.
Insect-resistant corn containing the BT toxin, derived from a bacterium and used in organic farming, does kill butterflies and other good insects but far less than 1% of them.
Just recently, a third theory has entered the arena, that Alexander died from a maladministration of hellebore, a medicine that, if given in too large a dose, could also be a toxin.
In one experiment Walsh and his team injected mice with a toxin, called MPTP, that induces Parkinson's disease by killing off dopaminergic neurons.
Larger fish that eat smaller fish can have concentrations of toxin a thousand times higher than the levels found in the river's sediment.
Injections of botulinum toxin were by far the number one cosmetic procedure in the country, with over 6.1 million procedures performed, up 8% from the year before.
Its nastiest toxin is actually part of a virus which settled in it millions of years ago, and Dr Heidelberg and his colleagues speculate that most of the second chromosome was also picked up from somewhere else along Vibrio's evolutionary way.
Four elderly men from the US state of Georgia have appeared in court charged with plotting to murder officials using explosives and the lethal toxin ricin.
It's only fitting that the company that produces Botox, the most popular form of botulinum toxin, purchased one of the top breast implant manufacturers back in 2005.
We've known for some time that lead is a potent neuro-toxin that can cause significant damage to a number of organs in the body, including the central nervous system, and can lead to behavioural problems in children.
Mr Crump was recorded in September saying he would like to make 10lb (4.5kg) of the toxin.
Professor Mike Lord, head of the toxin research group at the University of Warwick, is one of many scientists working in this area.
In addition, a drug currently used to treat high cholesterol levels could be able to deal with the toxin which causes ciguatera.
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