We have demonstrated that using a transition metal ion to partially substitute Cu ion of the YSr2Cu3Oy can stabilize its crystal structure and retain superconductivity. The superconducting transition temperature in YSr2(Cu1-xMx)3Oy, where M is transition metal ion, ranges from 40K to 80K depending on the specific M ion. Lattice contraction due to Sr substitution makes the Ba/Sr ion to move clos...

Porphyry systems supply most copper and significant gold to our economy. Recent studies indicate that they are frequently associated with high Sr/Y magmatic rocks, but the meaning of this association remains elusive. Understanding the association between high Sr/Y magmatic rocks and porphyry-type deposits is essential to develop genetic models that can be used for exploration purposes. Here we ...

Concentrations of inorganic elements were determined in eggs of passerine birds including the endangered southwestern willow flycatcher (Empidonax traillii extimus) from four regions in Arizona. The main aim of the study was to determine the distribution of metals in egg contents and eggshells, with emphasis on the deposition of Sr in eggshells. Seventy eggs of 11 passerine species were collect...

In 1988, material research focussed around the study of high temperature superconducting copper-oxides brought about new phases of Cu-O based systems, the two-leg spin-ladders (2LL's), that have the general formula (A 1−x A' x) 14 Cu 24 O 41 , with A an alkaline earth metal and A' a trivalent (transition or lanthanoid) metal [1, 2]. There were well-founded hopes that these materials could provi...

Copper (Cu) is an indispensable metal for normal development and function of humans, especially in central nervous system (CNS). However, its redox activity requires accurate Cu transport system. ATP7A, a main Cu(2+) transporting-ATPase, is necessary to efflux Cu across the plasma membrane and synthesize cuproenzymes. Menkes disease (MD) is caused by mutations in ATP7A gene. Clinically, MD is C...

BACKGROUND Asthma is a heterogeneous disease that presents with different clinical phenotypes. We aimed to compare the patients with asthma diagnosis alone with the patients, who, in addition to their asthma had accompanying analgesic intolerance (AI), chronic urticaria (CU) or seasonal rhinitis (SR) if there are any distinctions and specific characteristics of these defined patient groups. M...

Spectrum averaged cross sections for the Zn(n, p)Cu, Zn(n, p)Cu and Y(n, p)Sr reactions were measured using a 14 MeV d(Be) neutron source. In each case a clean radiochemical separation was performed and the radioactivity of the product was determined via highresolution γ -ray spectrometry or anticoincidence β− counting. The cross sections are three to five times higher than with a fission neutr...