interpreted by using a variety of schemes involving Ni(III)/Ni( I and Ni( I I I ) /Ni( I I ) /Ni( I ) / Ni(0)22 formal oxidation states. In all these schemes, the assignment of Ni(l1l) to the oxidized forms of the enzymes is based on the observation of hyperfine in 61Ni-labeled enzymes, the similarity of the EPR spectra to EPR spectra of tetragonal Ni(II1) coordination compounds, and the associ...

1. I NI Of the 42,000 people killed in traffic accidents, only 6 are children on school buses. 2. I NI School buses are safe enough already. 3. I NI High-backed seats on school buses help to “package children like eggs.” 4. I NI Lap and shoulder belts reduce injuries by 45 percent. 5. I NI Padded seats are all that is needed to protect students from harm. 6. I NI Buses are seven times safer tha...

Many patients are currently suffering from nickel (Ni)-induced allergic contact dermatitis (ACD). There have been few Korean studies dealing with the threshold of Ni-induced ACD and quantifying the total amount of Ni in the metal alloys. The aim of this study is to evaluate the amount of Ni leached from metal alloys and Ni contents in metal alloys, and to estimate the threshold of Ni-induced AC...

The existence of nickel (Ni) deficiency is becoming increasingly apparent in crops, especially for ureide-transporting woody perennials, but its physiological role is poorly understood. We evaluated the concentrations of ureides, amino acids, and organic acids in photosynthetic foliar tissue from Ni-sufficient (Ni-S) versus Ni-deficient (Ni-D) pecan (Carya illinoinensis [Wangenh.] K. Koch). Fol...

The effects of acute Ni exposure on the marine gulf toadfish (Opsanus beta) were investigated via separate exposures to waterborne nickel (Ni) and arterially infused Ni. Of the plasma electrolytes measured after 72 h of waterborne exposure (215.3 and 606.1 microM Ni in SW (salinity of 34)), only plasma [Ca2+] was significantly impacted (approximately 55% decrease at both exposure concentrations...

in this research, a sol-modified composite electrodeposition technique that combines the sol-gel method with the conventional electrodeposition process was utilized to deposit ni-tio2 nanocomposite coatings. cyclic voltammetry and chronoamperometry techniques were applied to study the influence of the tio2 sol concentration on the deposits’ electrochemical behavior. the results clearly showed t...

Nickel (Ni) availability in soil varies as a function of pH. Plants require Ni in small quantities for normal development, especially in legumes due its role in nitrogen (N) metabolism. This study investigated the effect of soil base saturation, and Ni amendments on Ni uptake, N accumulation in the leaves and grains, as well as to evaluate organic acids changes in soybean. In addition, two N as...

Approximately 1% of presolar SiC grains found in primitive meteorites condensed in the ejecta of Type II supernovae. To explain the isotopic signatures of these so-called X grains, material from different SN zones had to contribute to the mix from which the grains formed. We measured the Fe and Ni isotopic ratios of individual X grains with the NanoSIMS. Most grains have enhanced 57 Fe/ 56 Fe r...

The partial oxidation of [Ni(II/II)(2)(RCS(2))(4)] (R = Et (1), n-Pr (2), and n-Bu (3)) with iodine affords the MMX chain compounds [Ni(II/III)(2)(RCS(2))(4)I](infinity) (R = Et (4), n-Pr (5), and n-Bu (6)), respectively. The crystal structures of 4-6 consist of neutral one-dimensional (1-D) chains with a repeating -Ni-Ni-I- unit. The room-temperature (RT) structure of 4 indicates a charge-pola...

In moderately hard Lake Ontario water (approximately 140 mg L(-1) as CaCO3) waterborne Ni (9.7-10.7 mg Ni L(-1)) is acutely toxic to adult rainbow trout (Oncorhynchus mykiss) exclusively via branchial mechanisms. Ventilation in resting trout (evaluated using a ventilatory masking technique) was adversely affected, as ventilation rate (VR), ventilation volume (VG), opercular stroke volume (VSV) ...