Search results
Results from the WOW.Com Content Network
The Alchemist Discovering Phosphorus (1771) by Joseph Wright depicting Hennig Brand discovering phosphorus (the glow shown is exaggerated). Hennig Brand (German pronunciation: [ˈhɛnɪç bʁant]; c. 1630 – c. 1692 or c. 1710) was a German alchemist who lived and worked in Hamburg.
The patient was a female Viennese matchstick maker who had been exposed to the phosphorus vapors over a five-year period. [10] [11] He named the disease "Phosphorimus chronicus". [3] In 1844 Lorinser reported 22 cases of phossy jaw and established the toxic effects of white phosphorus in matchsticks. [12]
Thomas Phillip Lecky, known as T.P. Lecky (1904-1994), was a Jamaican scientist who developed several new breeds of cattle.Lecky is known as one of Jamaica's earliest environmentalists, and a strong advocate for conservation of hillsides. [1]
Phosphorus is a finite (limited) resource that is widespread in the Earth's crust and in living organisms but is relatively scarce in concentrated forms, which are not evenly distributed across the Earth. The only cost-effective production method to date is the mining of phosphate rock, but only a few countries have significant commercial reserves.
Toxicology testing, also known as safety assessment, or toxicity testing, is the process of determining the degree to which a substance of interest negatively impacts the normal biological functions of an organism, given a certain exposure duration, route of exposure, and substance concentration.
The authors recommended further study of per-species and per-development-stage chronic toxicity, of environmental glyphosate levels, and ongoing analysis of data relevant to determining what if any role glyphosate might be playing in worldwide amphibian decline, and suggest including amphibians in standardized test batteries.
Here is how the 12 U.S. states with bird flu cases in dairy herds are handling human and cattle testing: HUMAN TESTING. As of early July, 99 people had been tested for bird flu in four states this ...
In vitro toxicity testing is the scientific analysis of the toxic effects of chemical substances on cultured bacteria or mammalian cells. [1] In vitro (literally 'in glass') testing methods are employed primarily to identify potentially hazardous chemicals and/or to confirm the lack of certain toxic properties in the early stages of the development of potentially useful new substances such as ...