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A point particle is a 0-brane, of dimension zero; a string, named after vibrating musical strings, is a 1-brane; a membrane, named after vibrating membranes such as drumheads, is a 2-brane. [2] The corresponding object of arbitrary dimension p is called a p-brane, a term coined by M. J. Duff et al. in 1988. [3]
Chemical structure of 2,4-dichlorophenol. Dichlorophenols (DCPs) are any of several chemical compounds which are derivatives of phenol containing two chlorine atoms. There are six isomers:
This article about an organic halide is a stub. You can help Wikipedia by expanding it.
This article about an organic halide is a stub. You can help Wikipedia by expanding it.
It can be produced in a multistep process from phenol, which is converted to its 4-sulfonic acid derivative.The resulting phenol sulfonic acid chlorinates at the positions flanking the phenol.
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The LD50 is 580 mg/kg (rats, oral). Liquid (molten) 2,4-DCP is readily absorbed through the skin. [8] Solid 2,4-DCP does not readily absorb through skin and has a lower NFPA H=3 rating (versus H=4 for molten 2,4-DCP).
DDE has been shown to be toxic to rats at 79.6 mg/kg. [4] DDE and its parent, DDT, are reproductive toxicants for certain birds species, and major reasons for the decline of the bald eagle, [5] brown pelican [6] peregrine falcon, and osprey. [7]