The set of six bis(triorganotin(IV)) esters of 4-ketopimelic acid was prepared. Their structures were studied using IR, NMR and X-ray crystallographic (cyclohexyl and ethyl derivatives) techniques both in solution and the solid state. Five of these compounds are polymeric in the solid state and ...

To better understand the sources and atmospheric processing of organic aerosols in the remote marine atmosphere, aerosol (TSP) samples were collected over the North Pacific (13°14′N-53°37′N and 140°46′E-179°54′W) in May–July, 2010 during a cruise of T/V Oshoro Maru, and studied for dica...

Fine particulate matter (PM2.5) samples were collected using a high-volume air sampler and pre-combusted quartz filters during May 2013 to January 2014 at a background rural site (47∘35 N, 133∘31 E) in Sanjiang Plain, Northeast China. A homologous series of dicarboxylic acids (C2-C11) and rela...

Saturated (C2–C11) and unsaturated (C4–C5, C8) dicarboxylic acids were measured in Arctic aerosol and surface snowpack samples collected during dark winter (February) and light spring (April–May) using a gas chromatography and gas chromatography/mass spectrometry. Their molecular distribution...

Organic acids, including keto acids, are key intermediates of central pathways in cellular metabolism. In this study, a comprehensive and reliable method was developed and optimized for the simultaneous measurement of 17 keto acids in various biological samples. The keto acids were converted to ...

Carboxylic acids and aldehydes are present in ambient air particulate matter (PM) originating from both primary emission and secondary production in air and may, due to their polarity have, an impact on formation of cloud condensation nuclei. Their simultaneous determination may provide improved...

The presence of water-soluble dicarboxylic acids in atmospheric aerosols has a significant influence on the regional radiative forcing through direct aerosol effect and cloud formation process. Fine aerosol (PM2.5) samples collected in central Alaska (Fairbanks: 64.51°N and 147.51°W) during su...

Aerosol samples were collected at the summit of Mt. Fuji in July–August 2009 and analyzed for diacids and related compounds together with major ions to decipher the sources and formation process of organic aerosols in the free troposphere. Molecular distributions of diacids showed the predomina...

The densities, viscosities, and electrical conductivities of N-(2-hydroxyethyl) pyridinium bis(trifluoromethanesulfonyl)amide ([Py2OH][Tf2N]) have been measured over the temperature range T = 273.15–363.15 K at atmospheric pressure. The pressure–volume–temperature–composition relations in th...

Flame-retardant water-blown rigid polyurethane foams (RPUFs) with a reactive-type phosphoramidate named diethyl-N,N-bis(2-hydroxyethyl) phosphoramide (DEPA) and expandable graphite (EG) were fabricated through free foaming technique. The flame retardancy and fire behaviors of RPUFs were characte...

The interaction of charge-transfer (CT) complexes resulted from the reaction of N,N′-bis[2-hydroxyethyl]-1,4,6,8-naphthalenediimide (BHENDI) with some various acceptors like as substituted phenols in para position; 4-aminophenol (4AP), 4-methylphenol (4MP) and 4-nitrophenol (4NP) have been stud...

N,N-Bis-(3-phthalimidopropyl)-N-(2-hydroxyethyl)-N-propylammonium salts and their hydrates have been characterized by FTIR, Raman and NMR spectroscopy. Also B3LYP and PM5 calculations have been carried out. The optimized bond lengths, bond angles and torsion angles calculated by B3LYP/6-31G(d,p)...

Combining ionic liquids (ILs) with polymers offers the prospect of new applications, where they surpass the performance of conventional media, such as organic solvents, giving advantages in terms of improved safety and a higher operating temperature range. In this work we have investigated the m...

N,N-bis(2-hydroxyethyl)acetamide shows restricted rotation about the amide bond in both 1H and 13C NMR spectra rendering the two hydroxyethyl groups non-equivalent. A variable temperature study in CD3SOCD3 allowed estimation of the free energy barrier to rotation as 75.6 ± 0.2 kJ mol−1. Previou...

Barium is a divalent alkaline earth metal used as the insoluble sulfate salt in contrast radiography and soluble acid salts in industry. Barium poisoning results from ingestion or inhalation of the acid salts; the most common poisoning occurs after ingestion of the rodenticide barium carbonate (...

Sodium hexafluorosilicate (SFS) crystals were synthesized by precipitation by the reaction of hydrofluorosilicic acid and sodium carbonate at a pH of 2.5 and 3.5 and a magnetic field of 5.5 T was applied immediately after precipitation for 45 min at 20°C. SEM, XRD and FTIR spectroscope examined...

Hydantoin racemase enzyme together with a stereoselective hydantoinase and a stereospecific d-carbamoylase guarantee the total conversion from d,l-5-monosubstituted hydantoins with a low velocity of racemization, to optically pure d-amino acids. Hydantoin racemase from Sinorhizobium meliloti was...

Aqueous solutions of 5-substituted hydantoins were irradiated with ultraviolet (UV) light, to investigate their structural stability against UV radiation as well as the possible photolysis products. The photolysis products were identified and the degree of photolysis was measured using reversed-...

A series of analogues of the weak histamine (H2) agonist S-[2-(N,N-dimethylamine)ethyl] isothiourea (nordimaprit) was produced to investigate the possibility that bulky substituents on the tertiary amine of nordimaprit would enhance potency for depigmentation and killing of melanoma cells. Cell ...

Crystals of human carbonic anhydrase C were reacted with [14C] bromoacetazolamide and an alkylation was found to occur at the 3′-nitrogen of histidine-64, which is known to be located in the active site region. This reaction requires that the bromomethyl group of the reagent move from its initi...