The potential of economically cheaper cellulose containing natural materials like rice husk was assessed for nickel adsorption from aqueous solutions. The effects of pH, contact time, sorbent dose, initial metal ion concentration and temperature on the uptake of nickel were studied in batch process. The removal of nickel was dependent on the physico-chemical characteristics of the adsorbent, ad...

BACKGROUND  Non-celiac wheat sensitivity (NCWS) is a new clinical entity in the world of  gluten-related diseases. Nickel, the most frequent cause of contact allergy, can be found in wheat  and results in systemic nickel allergy syndrome and mimics irritable bowel syndrome (IBS).  Objective: To evaluate the frequency of contact dermatitis due to nickel allergy in NCWS patients  diagnosed by a d...

A substantial body of occupational epidemiology data has shown that exposure to mixed soluble and insoluble nickel causes the development of lung and nasal cancer. However, due to coexposure of these populations to soluble and insoluble forms of nickel, and limitations in exposure measurements, the contribution of soluble nickel is difficult to determine. Soluble nickel was negative in an NTP i...

The predominant exposure route for nickel compounds is by inhalation, and several studies have indicated the correlation between nickel exposure and respiratory cancers. The tumor-promoting effects of nickel compounds are thought to be associated with their transactivation of transcription factors. We have investigated the possible activation of activator protein-1 (AP-1) and nuclear factor KB ...

An occupational hygiene survey was made in 38 nickel plating shops in Finland and exposure to nickel was studied by means of biological measurements and, in three shops, by using air measurements. The average after-shift urinary nickel concentration of 163 workers was 0.16 mumol l.-1 (range 0.001-4.99 mumol l.-1). After the 1-5 week vacation the urinary nickel concentration was higher than the ...

A nickel sensitivity patch test was applied to 700 child dental patients, aged 5-12 years,from the Dental Clinic at the University of Western Ontario and nearby pediatric dental offices. Approximately one-half the children were known to have nickel-containing dental appliances. From a case history obtained from the paten ts, the history of the wearing of pierced earrings and other jewelry was a...

Nickel is an essential metal for Helicobacter pylori, as it is the co-factor of two enzymes crucial for colonization, urease and hydrogenase. Nickel is taken up by specific transporters and its intracellular homeostasis depends on nickel-binding proteins to avoid toxicity. Nickel trafficking is controlled by the Ni(II)-dependent transcriptional regulator NikR. In contrast to other NikR proteins...

Bacteria have evolved a number of tightly controlled import and export systems to maintain intracellular levels of the essential but potentially toxic metal nickel. Nickel homeostasis systems include the dedicated nickel uptake system nik found in Escherichia coli, a member of the ABC family of transporters, that involves a periplasmic nickel-binding protein, NikA. This is the initial nickel re...

Nickel is a virulence determinant for the human gastric pathogen Helicobacter pylori. Indeed, H. pylori possesses two nickel-enzymes that are essential for in vivo colonization, [NiFe] hydrogenase and urease, an abundant virulence factor that contains 24 nickel ions per active complex. Because of these two enzymes, survival of H. pylori relies on an important supply of nickel, implying a tight ...

Although nickel exposure results in allergic reactions, respiratory conditions, and cancer in humans and rodents, the ramifications of excess nickel in the environment for animal and human health remain largely undescribed. Nickel and other cationic metals travel through waterways and bind to soils and sediments. To evaluate the potential toxic effects of nickel at environmental contaminant lev...