A variety of C1-C12 carbonyl compounds were measured in the air of a boreal coniferous forest located in Hyytiälä, Southern Finland. 24-hour samples were collected during March and April in 2003 using DNPH (2,4dinitrophenyl hydrazine) coated C18-cartridges and analyzed by liquid chromatography-mass spectrometry (LC-MS). Altogether 22 carbonyl compounds were quantified. The most abundant carbony...

effective methodologies for efficient preparation of semicarbazones from aldehydes or ketones via milling and the subsequent regeneration of the parent carbonyls by gaseous nitrogen dioxide are described under solid-solid and gas-solid reaction conditions, respectively. these methods are fast, simple and environmentally benign which do not require the use of any auxiliaries such as catalysts or...

in this study the plasma levels of lipid peroxidation (lp) products, protein carbonyls and antioxidant capacity of plasma as judged by ferric reducing ability of plasma (frap assay) were compared in adult and weanling rats treated with vitamin k1 phylloquinone).

[reaction: see text] A study of the role of base in the isomerization of manganese-coordinated conjugated alkynyl carbonyls to the corresponding allenyl carbonyls is described. The use of phosphine additives indicates that manganese requires a ligand prior to isomerization with amine bases. A series of amine bases were also examined for their efficacy in this isomerization reaction revealing a ...

OBJECTIVE To determine if increased levels of oxidative damage are present in the brains of persons with mild cognitive impairment (MCI), a condition that often precedes Alzheimer disease (AD). METHODS The authors assessed the amount of protein carbonyls, thiobarbituric acid-reactive substances (TBARS), and malondialdehyde in the superior and middle temporal gyri (SMTG) and cerebellum of shor...

DFT implemented in ADF 2012.01 was used to know about the relative spatial displacements of three/four metals and the surrounding12 terminal and bridging CO groups in 5 poly-nuclear carbo nyls:[M3(CO)12],(M=Ru,Os),[Ir4(CO)12], [Fe3(CO)12] and [Rh4(CO)12]. After optimization, the software was first run using the “NMR Program” with Single Point, Default, None, Collinear, Nosym using TZP or TZ2P B...

Ambient carbonyls are critical precursors of ozone (O3) and secondary organic aerosols (SOA). To better understand the pollution characteristics in Taiyuan, field samplings were conducted, 13 detected an urban site Taiyuan for four seasons. The total concentration atmosphere was 19.67 ± 8.56 μg/m3. Formaldehyde (7.70 4.78 μg/m3), acetaldehyde (2.95 1.20 μg/m3) acetone (5.57 2.41 dominant carbon...