OBJECTIVES Copper (Cu) is widely used in industry for the manufacture of a vast range of goods including Cu-intrauterine devices (IUDs), electronic products, agrochemicals, and many others. It is also one of the trace elements essential to human health in the right measure and is used as a parenteral supplement in patients unable to ingest food. Elevated Cu levels have been found in the plasma ...

The stability of Zn(II) and Cu(II) complexes of porphyrin derivatives (pheophytin and mesoporphyrin) to UV-B irradiation was studied by absorbance spectroscopy in 95 % ethanol. The chosen porphyrins and their heavy metal complexes underwent first-order photochemical decomposition. In general, pheophytin was more stable than mesoporphyrin to UV-B irradiation. Moreover, the stabilities of the Zn(...

Methods The Brazilian Portuguese version of the CU-Q2oL was self-administered in 96 adults with CU treated at the outpatient clinic of a university hospital. Disease activity was assessed using the Urticaria Activity Score (UAS). The following characteristics were also studied: age, gender, type of urticarial and duration of disease. ANOVA was used to compare the results of CU-Q2oL between the ...

This work verifies that the W foil could be successfully welded on Cu through conventional explosive welding, without any cracks. The microstructure was observed through scanning electron microscopy (SEM), optical microscopy and energy-dispersive X-ray spectrometry (EDS). The W/Cu interface exhibited a wavy morphology, and no intermetallic or transition layer was observed. The wavy interface fo...

Initial stages of Cu immersion deposition in the presence of hydrofluoric acid on bulk and porous silicon were studied. Cu was found to deposit both on bulk and porous silicon as a layer of nanoparticles which grew according to the Volmer-Weber mechanism. It was revealed that at the initial stages of immersion deposition, Cu nanoparticles consisted of crystals with a maximum size of 10 nm and i...

  Introduction: [61Cu]diacetyl-bis(N4-methylthiosemicarbazone) ([61Cu]ATSM) is a well-established hypoxia imaging tracer with simple production and significant specifity. In this work the accumulation of the tracer is studied in wild-type, necrotic and hypoxic fibrosarcoma tumors. Methods: [61Cu]ATSM was prepared u...

The enantioselective surface chemistry of chiral R-2-bromobutane was studied on the naturally chiral Cu(643)R&S and Cu(531)R&S surfaces by comparing relative product yields during temperature-programmed reaction spectroscopy. Molecularly adsorbed R-2-bromobutane can desorb molecularly or debrominate to form R-2-butyl groups on the surfaces. The R-2-butyl groups react further by beta-hydride eli...