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There are three structural isomers: 1,2-dihydroxybenzene (the ortho isomer) is commonly known as catechol, 1,3-dihydroxybenzene (the meta isomer) is commonly known as resorcinol, and 1,4-dihydroxybenzene (the para isomer) is commonly known as hydroquinone.
Oil additives are chemical compounds that improve the lubricant performance of base oil (or oil "base stock"). The manufacturer of many oils can use the same base stock for each formulation and can choose different additives for each use. Additives comprise up to 5% by weight of some oils. [1]
Hydroquinone, also known as benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene, having the chemical formula C 6 H 4 (OH) 2. It has two hydroxyl groups bonded to a benzene ring in a para position. It is a white granular solid. Substituted derivatives of this parent compound are also ...
For edible oils, the tolerated limit of unsaponifiable matter is 1.5% (olive, refined soybean), while inferior quality crude or pomace oil could reach 3%. [ 12 ] [ 13 ] Determination of unsaponifiables involves a saponification step of the sample followed by extraction of the unsaponifiable using an organic solvent (i.e. diethyl ether ).
Amazon Prime Air is an experimental drone delivery service that delivers packages via drones to Amazon Prime subscribers in select cities. Amazon directly employs people to work at its warehouses, bulk distribution centers, staffed "Amazon Hub Locker+" locations, and delivery stations where drivers pick up packages.
1728 18104 Ensembl ENSG00000181019 ENSMUSG00000003849 UniProt P15559 Q64669 RefSeq (mRNA) NM_001286137 NM_000903 NM_001025433 NM_001025434 NM_008706 RefSeq (protein) NP_000894 NP_001020604 NP_001020605 NP_001273066 NP_032732 Location (UCSC) Chr 16: 69.71 – 69.73 Mb Chr 8: 108.11 – 108.13 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse NAD(P)H dehydrogenase [quinone] 1 is an ...
Petroleum [a] is a naturally occurring yellowish-black liquid mixture. It consists mainly of hydrocarbons, [1] and is found in geological formations.The term petroleum refers both to naturally occurring unprocessed crude oil, as well as to petroleum products that consist of refined crude oil.
Left: The 1,4-benzodiazepine ring system. Right: 5-phenyl-1H-benzo[e] [1,4]diazepin-2(3H)-one forms the skeleton of many of the most common benzodiazepine pharmaceuticals, such as diazepam (7-chloro-1-methyl substituted). A pharmacophore model of the benzodiazepine binding site on the GABA A receptor. [196]