While in the last two decades super-heavy elements with Z ≤ 112 have been studied, the focus of the present work is on the chemical properties of element 114. Our theoretical calculations have been motivated by two conflicting gas-chromatography experiments, which aimed on studying the interaction strength of element 114 with a gold surface. The experiment by Eichler et al. [1] reported adsorpt...

BACKGROUND Propolis is a sticky, dark brown resinous residue made by bees that is derived from plant resins. It is used to construct and repair the nest, and in addition possesses several diverse bioactivities. Here, propolis from Apis mellifera from Nan province, Thailand, was tested for antibacterial activity against Gram(+ve) (Staphylococcus aureus and Paenibacillus larvae) and Gram(-ve) (Es...

The present investigation was undertaken because of the need for a more practicable procedure for isolating pure porphyrins from biological materials. The existing methods, based primarily on solvent fractionation, on adsorption chromatography with calcium carbonate, talc, aluminum oxide, or other adsorbents, or on a combination of the two procedures, have failed in our hands to give an entirel...

PCEs are well known to improve the initial fluidity of CSA. However, their dispersion efficiency drops quickly over time. This issue can be solved by incorporating retarders. In this context, paper deals with influence citric acid, used as a retarder, PCE and combination on hydration workability Isothermal calorimetry, XRD TG analysis were describe process, while was characterized mini-cone tes...

The essential oil from the aerial parts of Aaronsohnia pubescens subsp. pubescens plant (APS oil) was extracted by hydrodistillation, and then its composition was analyzed by gas chromatography (GC) and GC-mass spectrometry (GC/MS). We identified thirty-four constituents presenting 87% of the total amount, Which, Carvacrol (13.9%), α-Pinene (10.3 %), E-Anethole (10.1%) and Ar-Turmerone (9.3%) w...

A typical situation in preparative chromatography is that a certain target component elutes somewhere in the middle of a train of other components present in the feed. In order to isolate efficiently this target component the operating conditions of conventional batch chromatography have to be optimized carefully. Nevertheless the achievable production rates and recovery yields are frequently l...

In this study, Malvasylvestris flower extract (MFE) was used as a corrosion inhibitor for carbon steel in 1 M HCl solution. Malvasylvestris extract was analyzed by gas chromatography coupled with a mass spectrometry detector (GC-MS). Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies revealed that the inhibition efficiency increases with increasing MFE concent...

A complete characterization of the different physico-chemical properties of nanoparticles (NPs) is necessary for the evaluation of their impact on health and environment. Among these properties, the surface characterization of the nanomaterial is the least developed and in many cases limited to the measurement of surface composition and zetapotential. The biological surface adsorption index app...

A procedure for chromatographic separation of 3and 4-substituted anilines on thin layers of silica gel in various systems has been developed with purpose of their identification and control of their purity. The chro­ matographic values Ям both from adsorption and partition chromatogra­ phies were correlated with physicochemical parameters pÄľa, er, and к. The relationship between RM from partit...

A procedure is described for obtaining DNA-dependent RNA polymerase form B from calf thymus in high purity. The procedure includes homogenization in low salt, sedimentation of chromatin at 50 000 x g, adsorption to DEAE-cellulose in a batch procedure, DNA-agarose chromato­ graphy, and chromatography on DEAE-Sephadex. Analyses of the preparation by band sedimenta­ tion and gel-electrophoresis in...