Lime mortars as a mixture of binder and aggregate may contain carbon of various origins. If the mortars are made of totally burnt lime, radiocarbon dating of binder yields the real age of building construction. The presence of carbonaceous aggregate has a significant influence on the 14C measure...

Mollusk shells are commonly present in a broad array of geological and archaeological contexts. The shell carbonate can serve for numerical age determination (Δ14C) and as a paleoenvironmental indicator (δ18O, δ13C). Shell carbonate recrystallization in soils, however, may re-equilibrate the ...

This study investigated the simultaneous removal of Sr2 + and 14CO32 − from pH > 12 Ca(OH)2 solution by the precipitation of calcium carbonate. Initial Ca2 +:CO32 − ratios ranged from 10:1 to 10:100 (mM:mM). Maximum removal of 14C and Sr2 + both occurred in the system containing 10 mM Ca2 + and ...

The deposition of gold nanoparticles in an electroplating solution containing gold (I) trisodium disulphite under synchrotron X-ray radiation was investigated. The nanoparticles grew and aggregated into clusters with increasing radiation time. This behavior is explained by evaluating the effect ...

While the role of dextrorphan and dextromethorphan as N-methyl-d-aspartate (NMDA) receptor antagonists has received considerable research attention, their effects on nicotinic acetylcholine receptors (nAChR) has been less well characterized. Recent in vitro and in vivo research has suggested tha...

BackgroundThe noncompetitive NMDA antagonists phencyclidine (PCP) and dizocilpine (MK-801) have been considered for use as neuroprotective therapeutic agents, although both produce injury in neurons of cingulate and retrosplenial cortices in rodents. The low-affinity, noncompetitive NMDA antagon...

Dextromethorphan, an antitussive, has a complex pharmacologic profile and has not been well studied. Our aim was to evaluate whether dextromethorphan and its metabolites, dextrorphan and 3-methoxymorphinan, have a spinal anaesthetic effect. Using a method of spinal blockade in rats, we evaluated...

BackgroundDextrorphan with long-acting local anesthetic effects did not cause system toxicity as fast as bupivacaine, while catecholamines (i.e., epinephrine) with the vasoconstrictive characteristics enhanced the effects of local anesthetic drugs. The objective of the experiment was to examine ...

Non-nucleoside reverse transcriptase inhibitors (NNRTIs) represent an integral part of the currently available combination antiretroviral therapy (cART) contributing to reduce the AIDS-mortality and turned the disease from lethal to chronic. In this context we recently reported a series of 6-chl...

The acute and chronic toxicity of a synthetic cholecystographic agent, bunamiodyl, 3-(3-butyrylamino-2,4,6-triiodophenyl)-2-ethyl sodium acrylate, was determined in rats and dogs. The LD60 was found to be 2.7 5 Gm. per Kg. of rat, and daily feedings of the material on the basis of 750 mg. per Kg...

Aiming at generating a library of bioactive indole alkaloid derivatives as multidrug resistance (MDR) reversers, two epimeric indole alkaloids (1 and 2) were submitted to chemical transformations, giving rise to twenty-four derivatives (5-28), bearing new aromatic or aliphatic azine moieties. Th...

The ring A monoglucuronides and monosulfates of 2-hydroxyestriol were synthesized from 2-hydroxy-estriol 16,17-diacetate by means of the Koenigs-Knorr reaction with methyl α-acetobromoglucuronate and sulfation with sulfur trioxide-pyridine complex, respectively. The conjugated positions of thes...

An electrochemical sensor using 3% lanthanum doped zinc oxide with reduced graphene oxide (3% LZO/RGO) nonohybrid was developed for the selective and sensitive determination of isoprenaline. The LZO (La = 0–5%) was synthesized by low temperature hydrothermal method. The structural and morpholog...

1,4-Dihydropyridine (1,4-DHP) derivatives have the reducing effect of extracellular Ca2+ ions influx on the L-type calcium channel. Because of this effect many 1,4-DHP derivatives are potent calcium channel blockers and antihypertensive agents. The biphenyl group is present in the structures of ...

Recombinant β-galactosidase from Lactobacillus plantarum WCFS1, homologously over-expressed in L. plantarum, was purified to apparent homogeneity using p-aminobenzyl 1-thio-β-d-galactopyranoside affinity chromatography and subsequently characterized. The enzyme is a heterodimer of the LacLM-fa...

p-Aminophenyl 2-acetamido-2-deoxy-1-thio-β-D-glucopyranoside and -galactopyranoside were synthesized for use as ligands in the purification of 2-acetamido-2-deoxy-β-D-glucosidase, from Aspergillus niger and Phaseolus vulgaris, by affinity chromatography. The condensation of 2-acetamido-1,3,4,6...

Shifting from aqueous to water lean solvents has been evaluated as a mean for increasing the mass transfer rates in regular chemical solvents with amines. An array of amines (monoethanolamine, 2-methylpiperazine and N-methyl diethanolamine) and diluents (sulfolane, ethylene glycol, 1-methylimida...

The synthesis, structures and properties of three new Zn2+-trimesate (BTC3−) coordination polymers (CPs), {[Zn(BTC) (NH3)2]·2H2O}n (1), {[Zn3(BTC)2(NH3)2(H2O)6]·2H2O}n (2) and {[Zn3(BTC)2(NH3)6]·5H2O}n (3), have been reported. They were isolated under the ammoniacal circumstance by dissolving...

Nitrogen-hydrogen (N-H) stretching vibration modes serve as key probes in the identification of the binding strength between amine and hydrogen chloride. Their assignments give us a theoretical viewpoint that could help us select the most suitable solvent for the regeneration of extractant tri-n...

A concept is demonstrated for the separation of two organic solutes from a common solvent by solvent swing adsorption (SSA), coupled with organic solvent nanofiltration (OSN) for solvent recycling. The polymer of intrinsic microporosity PIM-1 was utilized both for the adsorbent and for the nanof...