380,121 research outputs found
Suppression of zinc dendrites in zinc electrode power cells
Addition of various tetraalkyl quarternary ammonium salts, to alkaline zincate electrolyte of cell, prevents formation of zinc dendrites during charging of zinc electrode. Electrode capacity is not impaired and elimination of dendrites prolongs cell life
Effect of Sugar Cane and Cassava Juices as Addition Agents in the Electrodeposition of Zinc from Acid Based Solution
An experimental investigation has been made into the effectiveness of some tropical agricultural resources, sugar cane and cassava juices, as addition agents in the electrodeposition of zinc from an acid chloride bath. The electrodeposition of zinc on steel was performed by the partial immersion of the steel specimen and the zinc electrodes in plating solution using a DC supplier. While a fairly good zinc electrodeposition on mild steel substrate could be obtained in the acid zinc chloride
solution, using either cassava juice or sugar cane juice alone, the synergistic effect of the two juices combined gives a far better resul
Improved alkaline electrochemical cell
Addition of lead ions to electrolyte suppresses zinc dendrite formation during charging cycle. A soluble lead salt can be added directly or metallic lead can be incorporated in the zinc electrode and allowed to dissolve into the electrolyte
Low-energy structures of zinc borohydride Zn(BH)
We present a systematic study of the low-energy structures of zinc
borohydride, a crystalline material proposed for the hydrogen storage purpose.
In addition to the previously proposed structures, many new low-energy
structures of zinc borohydride are found by utilizing the minima-hopping
method. We identify a new dynamically stable structure which belongs to the
space group as the most stable phase of zinc borohydride at low
temperatures. A low transition barrier between and , the two
lowest-lying phases of zinc borohydride is predicted, implying that a
coexistence of low-lying phases of zinc borohydride is possible at ambient
conditions. An analysis based on the simulated X-ray diffraction pattern
reveals that the structure exhibits the same major features as the
experimentally synthesized zinc borohydride samples.Comment: Version accepted by Phys. Rev. B. Manuscript has 8 pages, 5 figures,
2 tables (with 6 pages, 5 figures, 2 tables in supplemental material
Morphology and Properties of Zn-Al-TiO2 Composite on Mild Steel
The influence of TiO2 composite and dispersed pure Al particle on zinc alloy electrodeposited on mild
steel was studied from chloride bath solution.Microstructural and mechanical properties of the alloy were
investigated. The structure, surface morphology, and surface topography of the deposited alloys were
characterized by scanning electron microscopy (SEM) and atomic force microscope (AFM).In addition,
hardness of the coated alloys was measured. It was found that the obtained Zn-Al-TiO2 alloyexhibited
more preferred surface morphology and mechanical strength compared tothe substrate. The result shows
the existence of interaction between TiO2 compounds and zinc alloy particulate. It also exhibited well
bright dominate zinc coating on steel surface
Both Ca2+ and Zn2+ are essential for S100A12 protein oligomerization and function
Background
Human S100A12 is a member of the S100 family of EF-hand calcium-modulated proteins that are associated with many diseases including cancer, chronic inflammation and neurological disorders. S100A12 is an important factor in host/parasite defenses and in the inflammatory response. Like several other S100 proteins, it binds zinc and copper in addition to calcium. Mechanisms of zinc regulation have been proposed for a number of S100 proteins e.g. S100B, S100A2, S100A7, S100A8/9. The interaction of S100 proteins with their targets is strongly dependent on cellular microenvironment.
Results
The aim of the study was to explore the factors that influence S100A12 oligomerization and target interaction. A comprehensive series of biochemical and biophysical experiments indicated that changes in the concentration of calcium and zinc led to changes in the oligomeric state of S100A12. Surface plasmon resonance confirmed that the presence of both calcium and zinc is essential for the interaction of S100A12 with one of its extracellular targets, RAGE – the Receptor for Advanced Glycation End products. By using a single-molecule approach we have shown that the presence of zinc in tissue culture medium favors both the oligomerization of exogenous S100A12 protein and its interaction with targets on the cell surface.
Conclusion
We have shown that oligomerization and target recognition by S100A12 is regulated by both zinc and calcium. Our present work highlighted the potential role of calcium-binding S100 proteins in zinc metabolism and, in particular, the role of S100A12 in the cross talk between zinc and calcium in cell signaling
Enhanced selectivity in the conversion of methanol to 2,2,3-trimethylbutane (triptane) over zinc iodide by added phosphorous or hypophosphorous acid
The yield of triptane from the reaction of methanol with zinc iodide is dramatically increased by addition of phosphorous or hypophosphorous acid, via transfer of hydride from a P–H bond to carbocationic intermediates
Addition and cycloaddition reactions of allenyl cations with various cycloalka-1,3-dienes
Allenyl cations , generated from propargyl chlorides and zinc chloride give monocyclic adducts or [3+4] and [2+4] cycloaddition products with various cycloalka-1,3-dienes. The mode of addition depends on R and the ring size of the 1,3-dienes
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