Palladium clusters, free and supported on surfaces, and applications in hydrogen storage

Palladium is a late transition metal element in the 4d row of the periodic table. Palladium nanoparticles show an efficient catalytic activity and selectivity in a number of chemical reactions....

The Potential of Walnut Seeds (Canarium indicum L.) in Repairing The Genotoxicity Effect of Mercury on Mice Erythrocytes

Hydrargyrum (familiar as mercury) is a persistent transition metal element. They are known as bio-accumulative properties that are dangerous to the environment and has serious damaging effects on biota, including genetic changes or mutagenesis. Moreover, it can accumulate indirectly in the human body due to the consumption of products that have contaminated. Whereas, ellagic acid has reported as one of 13 flavonoid compounds that have potential as an anti-mutagen and anti-cancer in the walnuts seeds. This study was aimed to ensure the potential extent of ellagic acid extracts in walnut seeds to reducing and repairing the genotoxicity effects of mercury. Therefore, using the experimental method, this study was divided into several test treatments. Two controls treatment as a comparison of the presence of micronucleus with group tests that given a 20 ppm mercury dosage. Then continued with the addition of walnut seed extract with various dosage (10, 15, and 20 ppm) by oral injection continuously for two weeks as a recovery process to reducing and repairing the genotoxicity effect of mercury. The significant results showed that there are differences between pre and post-treatment. It indicated that the extract has the potential for improving and reducing the genotoxicity effect of mercury. The data were evaluated and obtained the total micronucleus from the smear of peripheral blood of mice by comparing the total micronucleus before and after giving of walnut extract.

Elements of Life at the Oxo Wall

We live on a planet bathed in dioxygen. Iron, the most abundant transition metal element on Earth, reacts with dioxygen to form rust and red clays. It is also an essential component of enzymes that generate the energy we need to live, but alas, many of these reactions can be harmful, leading eventually to destruction of vital organs in our bodies. We can’t live without iron and dioxygen, but there are challenges living with them!

Information of valence charge of 3d transition metal elements observed in L-emission spectra

L-emission spectra of 3d transition metal elements from Sc to Zn and some oxides were measured to examine the relation between L-emission intensities of Lα, Lβ, Lℓ, and Lη and valences of those elements by using a soft X-ray emission spectrometer attached to a scanning electron microscope. Lα,β emission intensity due to transitions from valence bands to core 2p levels compared with Lℓ,η emission intensity due to transitions from core 3 s to deeper 2p levels, Lα,β/Lℓ,η was found to be a key parameter. A linear relation was found between the number of 3d electrons and the intensity ratio of Lα,β/(Lα,β+ Lℓ,η) from Sc to Ni, except for Cr. It takes into account not only a change in N3d but also a change of transition probability due to a change in N3d In the case of 3d metal oxides, the evaluation based on the equation showed an overestimation of the calculated number of 3d electrons, which could be due to a charge transfer from ligand oxygen atoms to the transition metal element, resulting from a core-hole effect in the intermediate state.