A β-Ta nanocrystalline coating was engineered onto a Ti-6Al-4V substrate using a double cathode glow discharge technique to improve the corrosion resistance and bioactivity of this biomedical alloy. The new coating has a thickness of ~40 μm and exhibits a compact and homogeneous structure composed of equiaxed β-Ta grains with an average grain size of ~22 nm, which is well adhered on the substra...

Bio-chemical reduction method was employed to synthesise the silver nanoparticles (Ag NPs) by aging the mixture of the aqueous extract of the Trachyspermum Ammi (TA, Ajwain) seeds and AgNO3 solution at different time interval. Reaction time of AgNO3 and TA could accelerate the reduction rate of Ag and affect AgNPs size and concentration of NPs. X-ray diffraction (XRD) studies confirms the forma...

Honeybees are effective monitors of environmental pollution. The objective of this study was to summarize tritium en) concentrations in bees and honey collected from within and around Los Alamos National Laboratory (LANL) over an 18-year period. Based on the long-term average, bees from nine out of eleven hives and honey from six out of eleven hives on LANL lands contained H that was significan...

Proton propagation in nuclei was studied using the (e,elp) reaction in the quasifree region. The coincidence (e,elp) cross sections were measured at an electron angle of 50.4" and proton angles of 50. lo, 58.2", 67.9", and 72.9" for I2C, " ~ 1 , 58Ni, and I8'Ta targets at a beam energy of 779.5 MeV. The average outgoing proton energy was 180 MeV. The ratio of the (e , e l p) yield to the simult...

centrations than in the presence of Nb, Ta and Cr. The average sizes of the Al, Ti, Zr, Nb, Ta and Cr particulates were 6.48ym, 16.99gm, 5.07"m, 14.18,um, 8.32pm and 23.27ym respectiveiy. The interaction of HOS cells with the particulates was more s/ensitive than that ef MG-63 cells. ALP activity increased at higher concentrations only with the Al partieulates; ether experimental conditions did...

KEY POINTS Cortico-hippocampal feed-forward circuits formed by the temporoammonic (TA) pathway exhibit a marked increase in excitation/inhibition ratio and abnormal spike modulation functions in Fmr1 knock-out (KO) mice. Inhibitory, but not excitatory, synapse dysfunction underlies cortico-hippocampal feed-forward circuit abnormalities in Fmr1 KO mice. GABA release is reduced in TA-associated i...

A T→A mutation in the promoter region of porcine myostatin (MSTN) gene has been identified in our previous work. This study analyzed the associations of the myostatin genotypes (TT, TA) caused by this mutation with birth weigh in Yorkshire pigs. Data from 211 unrelated individuals were collected three times from one breeding farm. Detections of the mutation were carried out by PCR-RFLPs approac...

The effect of additions of tantalum (Ta) to a 40-30-30 cobalt (Co) -chromium (Cr) nickel (Ni) alloy has been studied for several years at the University of Michigan. Mechanical properties of a series of these alloys have been reported by Mohammed and Asgar.1 Those results showed that an alloy containing 13% Ta would have an ultimate tensile strength of 124,000 psi, a yield strength of 90,000 ps...

The reactions in the Si/TaC/Cu and Si/Ta2N/Cu metallisation systems were investigated by x-ray diffraction, Rutherford backscattering, scanning electron microscope and the transmission electron microscopy. The results were then combined with the assessed ternary SiTa-C, Ta-C-Cu, Si-Ta-N and Ta-N-Cu phase diagrams. It was found that both barriers ultimately failed due to diffusion of Cu through ...

Rare-earth niobate and tantalate materials are of considerable interest for use as phosphors, photocatalysts and ionic conductors. We successfully synthesized Ln3MO7 (Ln = Y, Ce, Er, Ho, Tm, Yb and Lu, M = Ta, Nb) nanophosphors by a hydrothermal method using the water-soluble Lindqvist ion polyoxometalates [HNb6O19](7-) and [Ta6O19](8-) as Nb and Ta sources. The Pawley refinements of these nano...