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methylene
noun
The divalent radical CH2< in which the free valencies are part of single bonds.
synonyms
Exact(47)
Another drug, methylthioninium chloride (Rember), more commonly known as methylene blue (an organic dye), targets the tau protein of neurofibrillary tangles.
Cationic organic molecules, such as certain aliphatic and aromatic amines, pyridines, and methylene blue, may replace inorganic exchangeable cations present in the interlayer of expansible minerals.
Gerhardt suggested that successive additions of methylene (CH2) to a fundamental group yielded a series of related compounds, such as the alcohols.
The German medical scientist Paul Ehrlich found that methylene blue stains living nerve cells but not adjacent tissue.
Triacetate is a high-melting (300 °C [570 °F]), highly crystalline substance that is soluble only in a limited range of solvents (usually methylene chloride).
Although some high-volume companies still decaffeinate by using solvents (mainly ethyl acetate, as methylene chloride is considered a possible carcinogen), the process is regulated such that the chemicals are removed before the coffee is roasted.
The process of decaffeination was initially solvent-based (in the early 20th century using benzene but later using methylene chloride or ethyl acetate).
Ethylene molecules are essentially composed of two methylene units (CH2) linked together by a double bond between the carbon atoms a structure represented by the formula CH2=CH2.
Gutta-percha differs from rubber in the way in which methylene (−CH2−) groups are arranged; in gutta-percha they are on opposite sides (trans arrangement) of the double bond, and in rubber they are on the same side (cis arrangement).
Similar(2)
Isocyanates commonly used to prepare polyurethanes are toluene diisocyanate (TDI), methylene-4,4′-diphenyl diisocyanate (MDI), and a polymeric isocyanate (PMDI).
With formaldehyde it gives methylene urea fertilizers, which release nitrogen slowly, continuously, and uniformly, a full year's supply being applied at one time.
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