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n.1.(Chem.) See Methylene.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The absorptions at 2,960, 2,917, and 2,851 [cm.sup.-1] are attributed to the stretching vibration of the methyl (-C[H.sub.3]) and methene (-C[H.sub.2]) groups in NR [18].
The peak at 3.7 ppm was associated with the methene (s, -C[H.sub.2]) proton of the PEG chain.
The same C-H bands were observed at 2929 and 2872 [cm.sup.-1] in TiS, which were the characteristic peak of methene. The stretching vibration absorption bands of C=O and C-O were detected at 1740 [cm.sup.-1] and 1068 [cm.sup.-1], respectively.
And the [sup.13]C NMR (Table 1) and DEPT spectra showed fourteen carbons, including a carbonyl, a methene, three methines, three methyls, and six aromatic carbons, two of them bearing oxygen atoms (C-4 and C-5).
(158) Additionally, CagA down-regulates the expression of Heme oxygenase-1 (HO-1), a potent anti-oxidant and anti-inflammatory molecule that cleaves the heme ring at the a methene bridge to form biliverdin, thereby enhancing genotoxic stress.