The barrier to rotation around the bond between the formyl group and the complexed ring in para-dimethylamino-π-(tricarbonylchromium) benzaldehyde (I) was determined by 13C NMR spectroscopy at variable temperature and complete line shape analysis. The ΔG≠ value for the interconversion in I (8...

SummaryExcised thioesterase domains are versatile catalysts for macrocyclization. However, thioesterase-catalyzed cyclization is often precluded due to the occurrence of hydrolysis and product inhibition. To circumvent these obstacles, we devised an unprecedented strategy: coincubation with DNA ...

The binding kinetics of the intercalative binding of Triostin A to λ-DNA was investigated by measuring the force extension response of the DNA-ligand complexes with an optical tweezers system. These force response curves, containing the information about different binding properties, were analy...

Acid hydrolysis of Triostin C proved that the constituents were quinoxaline-2-carboxylic acid (2 moles), d-serine (2 moles), l-alanine (2 moles), N,N′-dimethyl-l-cystine (1 mole), and N,γ-dimethyl-l-alloisoleucine (2 moles). The sequence was proved to be in the order given above and lactone li...

Over 30 water‐soluble salts of 8‐bromotheophylline have been prepared and their chemical and physiological properties studied. One of these (the salt 2‐methyl‐2‐amino‐1‐propanol 8‐bromotheophyllinate) has been found to have a low order of toxicity. It has been found to be a useful diuret...

In this research, a novel composite, poly(2-hydroxyethylmethacrylate-expanded perlite) [P(HEMA-EP)], was synthesized and its adsorptive features were investigated. P(HEMA-EP)’s adsorptive features were evaluated for UO22+ and Th4+ ions in terms of the dependency upon the ion concentration, pH, ...

Here, for the first time, the direct and indirect mechanism is reported for nickel phosphate (nNiPh) modified glassy carbon electrode (GC) in alkaline solution. The two mechanisms are discussed using formaldehyde (FAL) electrochemical oxidation as the probe reaction. At lower FAL concentration, ...

The intramolecular rotation of several CO and CC bonds of a set of aliphatic ethers were studied using quantum-chemical calculations at the RB3LYP 6-311++G(3df,3pd) level of theory. For molecules of di-n-propyl (I), diisopropyl (II), methyl-n-propyl (III) and methyl isopropyl (IV) ether, the mos...

We report infrared spectra of the n- and i-propyl radicals isolated in solid para-hydrogen (p-H2). Propyl radicals were produced via 248 nm irradiation of matrices formed by co-deposition of p–H2 and either 1-iodopropane (forming n-propyl) or 2-iodopropane (forming i-propyl). Secondary photolys...

The synthesis and thermal behaviour of strontium uranyl malonate and barium uranyl malonate trihydrates are described. Their thermal behaviour has been investigated by DTA, TG and X-ray diffraction techniques. In the thermal dehydration of these compounds, the monohydrate and anhydrous intermedi...

The discovery of nuclear fission, 50 years ago, is reviewed under the aspect of target technology.

Magnesium mono- and triuranates were prepared by ignition of MgCl2 with U3O8. A non-stoicheiometric phase, as yet uncharacterized was formed when SrCl2 was annealed with U3O8(Sr:U = 1:1). Barium mono- and diuranates were prepared by sintering barium carbonate and U3O8. Phases not fully identical...

BaU2O7 is tetragonal, space group 141/amd, with a = 7·128 Å, c = 11·95 Å. The uranium atoms are in octahedral co-ordination, and linear uranyl groups are present. The octahedra are joined by sharing edges, and form endless chains in the a and b directions. The main features of the infra-red ...

Current studies describe the application of simultaneous thermogravimetry–differential thermal analysis – evolved gas analysis techniques for the compositional characterization of magnesium diuranate (MDU) with respect to the impurities present in the matrix. The stoichiometric composition of ...

A systematic study of the photooxidation of phenanthrene under simulated environmental conditions was conducted in vitro using polar (methanol, acetonitrile) and non-polar (isooctane, hexane) solvents as media. In all solvents, phenanthrene concentration decreased exponentially as exposure time ...

A simple, sensitive, efficient and rapid method was developed based on vortex assisted deep eutectic solvent dispersive liquid-liquid microextraction (VA-DES-DLLME) of five commonly used synthetic red dyes (amaranth, ponceau 4R, allura red, azorubine, and erythrosine) in food samples and simulta...

This work studied the preparation of smart edible films based on gelatin and anthocyanins. Films were prepared by casting using aqueous or alcoholic extracts of red cabbage (Brassica oleracea L.) as solvent. The addition of these extracts to formulation provided films with important antioxidant ...

Solvent Extraction was tested to extract astaxanthin from Haematococcus pluvialis in red phase (HPR), by investigating effects of solvents, extraction pressure and temperature. Astaxanthin isomers were identified and quantified in the extract. The performances of acetone and ethanol, Generally R...

A polarized laser (488.0 nm) Raman spectroscopic measurement has been made on a single crystal of a disodium salt of adenosine triphosphoric acid (Na2ATP·3H2O) by the use of a Raman microscope. The crystal belongs to an orthorhombic system of the space group P212121, and has dimensions of 10, 1...

Artefact compounds obtained during acid hydrolysis of saponins from Medicago spp. (Fabaceae), have been monitored and evaluated by GC-FID. Their identification has been performed by GC-MS and 1H and 13C NMR. Saponins with different substituents on the triterpenic pentacyclic aglycones were consi...