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Cyanobacteria (blue-green algae) bloom on Lake Erie (United States) in 2009. These kinds of algae can cause harmful algal bloom. A harmful algal bloom (HAB), or excessive algae growth, sometimes called a red tide in marine environments, is an algal bloom that causes negative impacts to other organisms by production of natural algae-produced toxins, water deoxygenation, mechanical damage to ...
If hydrogen cyanide is inhaled, it can cause a coma with seizures, apnea, and cardiac arrest, with death following in a matter of seconds.At lower doses, loss of consciousness may be preceded by general weakness, dizziness, headaches, vertigo, confusion, and perceived difficulty in breathing.
Referring to a common salt of fluoride, sodium fluoride (NaF), the lethal dose for most adult humans is estimated at 5 to 10 g (which is equivalent to 32 to 64 mg elemental fluoride/kg body weight). [ 2 ] [ 3 ] [ 4 ] Ingestion of fluoride can produce gastrointestinal discomfort at doses at least 15 to 20 times lower (0.2–0.3 mg/kg or 10 to 15 ...
the first has somehow, in some way, been my best year yet. So, as I often say to participants in the workshop, “If a school teacher from Nebraska can do it, so can you!”
The brown snake is not the most venomous Australian snake, but it has caused the most deaths. [1]Wildlife attacks in Australia occur every year from several different native species, [2] [3] including snakes, spiders, freshwater and saltwater crocodiles, various sharks, cassowaries, kangaroos, stingrays and stonefish and a variety of smaller marine creatures such as bluebottles, blue-ringed ...
The structure of a general cyanohydrin. In organic chemistry, a cyanohydrin or hydroxynitrile is a functional group found in organic compounds in which a cyano and a hydroxy group are attached to the same carbon atom.
“Personally, if I had to choose being bitten by a newborn copperhead or an adult, I would choose a newborn because of the potentially much smaller quantity of venom.” Bites are rarely fatal.
Based on risk assessment, a safe upper intake level of 250 μg (10,000 IU) per day in healthy adults has been suggested by non-government authors. [ 5 ] [ 6 ] Blood levels of 25-hydroxyvitamin D necessary to cause adverse effects in adults are thought to be greater than about 150 ng/mL, leading the Endocrine Society to suggest an upper limit ...