Reaction of 1,2-diaminoethane-N,N,N′,N′-tetra-(N-methylacetamide), L, with K[AuCl4] in water gave the complex [AuLCl2][AuCl4] which when recrystallised from MeOH/H2O gave the amidate-containing complex [Au(LH−1)Cl][AuCl4] the crystal structure of which shows LH−1 to be present as a tridentate ...

Protonated lower rim calix(4)arene amino derivatives are able to interact with anions. This statement is corroborated by the first crystal structure of {tetrakis[1-(ethyl)piperidinium]oxyl}p-tert-butylcalix(4)arene-bis-[tetrachloroaurate(III)]dichloro dihydrate which shows that the protonated ni...

The reaction AuCl−4 + am → AuCl(am)2+ + 3Cl− where am = 1,1,4-trimethyldiethylenetriamine in aqueous acid medium obeys the rate law where k and k′ are constants. When am= 1,1,7,7-tetramethyldiethylenetriamine or 1,1,4,7,7-pentamethyldiethylenetriamine the rate law changes to where k″ and k‴...

The kinetics of the reaction [AuCl4]− + en → (where en is ethylenediamine), have been studied in acid medium at different temperature and pH values and the following reaction scheme is suggestd: Also included are some tentative results suggesting At 25°C values of k1=4.7 × 102M−1sec−1, k2=1...

It is shown that the reaction AuCl4−+enH+→ (en = ethylenediamine) in aqueous acid medium obeys the same rate law as the reaction with the diethylenetriamine ligand viz. which is derived from the reaction scheme

The aim of this study is to investigate systematically the chloride diffusivity and chloride threshold of a wide range of calcium-rich and fly ash-dominated alkali-activated samples in light of their compositional differences. To this end, the effects of various fly ash (FA)-to-slag ratios, of a...

This paper investigates the combined action of carbonation and chloride ingress in concrete under stable moisture state. The chloride profile is solved through a moving boundary problem, assuming a carbonation front, different chloride diffusivities for carbonated and intact zones, and a constan...

The present study investigates the chloride ingress and binding behaviors of coral waste filler-coral waste sand marine mortar and the influence imposed by metakaolin (MK) addition. The mortars were cured for 4 months and followed by exposing to 0.5 M sodium chloride solution for 45 days. Therea...

This study aims to investigate and correlate durability parameters in concrete exposed to external chloride. Tests for corrosion, chloride diffusion, and X ray diffraction (XRD) analysis were performed. Based on results, ordinary Portland cement (OPC) exhibited 4.82 and 2.02 times higher apparen...

This study investigates the corrosion of reinforcement in geopolymer concrete manufactured from three different low calcium fly ashes from Australian power plants. The long term corrosion condition of embedded rebar in fly ash geopolymer concretes containing cast in chlorides (0–5%) subjected t...

This paper aimed to evaluate the effect of electrochemical chloride removal (ECR) on the stability of bound chlorides in ground granulated blast furnace slag (GGBS) blended cement pastes subjected to NaCl and Na2SO4 attack. Two chloride attack conditions (pure chlorides, 5%NaCl + 0%Na2SO4, and t...

This study evaluated the chloride diffusion resistance of low-calcium fly ash-based geopolymer concrete through electrical and bulk diffusion techniques. The geopolymer concretes were prepared using 12 different heat curing conditions; three temperatures of 60, 75 and 90 °C and four curing dura...

Microbial adsorption of heavy metals has been attracted more interest in the recent years. However, there are very few studies in investigating the biosorption of heavy metals by Shewanella putrefaciens, which is a metal reducing bacterium. Firstly, the effects of contact time, pH value, tempera...

This experiment was conducted to evaluate the combined effects of phytase, citric acid and vitamin D3 on the digestibility coefficients, growth performance, body composition, and vertebral and serum mineral contents in juvenile yellow catfish (Pelteobagrus fulvidraco). The study used 1200 juveni...

The factories dedicated to the production of phosphoric acid by the so-called wet acid method are usually considered typical NORM industries, because the phosphate rock used as raw material usually contains high concentrations of 238U-series radionuclides. The magnitude and behaviour of the radi...

The extraction of Nd3+ and Sm3+, including the extraction and stripping capability as well as the separation effect of Nd3+ or Sm3+, from a sulfuric acid medium, by mixtures of di-(2-ethylhexyl) phosphoric acid (HDEHP, H2A2(0)) and 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (HEH/EHP, H...

PurposeTo evaluate the immediate microshear resin-enamel bond strength (μSBS) and the immediate and 6-month microtensile bond strength (μTBS) and nanoleakage (NL) of the adhesive interface performed by different pHs of 40% meta-phosphoric acid (MPA) were compared with conventional 37% ortho-ph...

A series of 17α-substituted estradiols was synthesized in which the stereochemical characteristics of carbons 20 and 21 were modified. It was found that the (Z)-isomer demonstrated more favorable receptor binding affinity than the corresponding (E)-isomer.

A series of betamethasone 17α-carbamates were designed, synthesized, and evaluated for their ability to dissociate the two main functions of the glucocorticoid receptor, that is, transactivation and transrepression, in rat cell lines. A number of alkyl substituted betamethasone 17α-carbamates ...

A series of new anti-inflammatory steroidal antedrugs with C-16,17-isoxazoline ring system were synthesized and their pharmacological activities were evaluated. We reported earlier that these compounds are promising antedrugs based on the results of 5-day rat croton oil ear edema assay. In the p...