In hard disk drive manufacturing, the tolerance ring is commonly used for coupling a bearing cartridge to an arm actuator. Further, the tolerance ring can prevent slippage between the arm actuator and bearing assembly during operation of disk drive or during shock events. The metal scratch occurred in the tolerance ring installation process cause a number of particles. The main purpose of this ...

With the intention of screening for heavy metal tolerance, a number of bacteria were isolated and characterized from a pristine soil. Two Gram positive isolates were identified as Paenibacillus sp. and Bacillus thuringeinsis. Tolerance of Cd, Cu and Zn by these bacteria was studied and found that both bacteria were highly sensitive to Cu compared to other two metals. Both bacteria showed the sa...

Bryophytes, including the mosses, liverworts, and hornworts, occur in a variety of habitats with high concentrations of metals and have other characteristics that are advantageous for studies of metal tolerance. Mosses may evolve genetically specialized, metal-tolerant races less frequently than flowering plants. Some species of mosses appear to have inherently high levels of metal tolerance ev...

Microorganism-based bioremediation is a well-sought after method for industrial wastewater treatment and forms the primary stage. The current research suggests using Spirulina platensis as an organism of choice bioremediation. This study provides insight into potential use primary-treated growth media platensis. tolerance S. was confirmed metals such mercury (Hg), cadmium (Cd), manganese (Mn), ...

A relatively small yet diverse group of plants are capable of sequestering metals in their shoot tissues at remarkably high concentrations that would be toxic to most organisms. This process, known as metal hyperaccumulation, is of interest for several reasons, including its relevance to the phytoremediation of metalpolluted soils. Most research on hyperaccumulators has focused on the physiolog...

Heavy metals are non-essential elements for plants. If plentiful amounts are accumulated in the plants, heavy metals will adversely affect the absorption and transport of essential elements, disturb the metabolism, and have an impact on growth and reproduction. Toxic Levels of Lead (Pb), Cadmium (Cd), Mercury (Hg), Arsenic (As) affects plant processes at physiological and biochemical levels. Wh...

Increased environmental pollution has necessitated the need for eco-friendly clean-up strategies. Filamentous fungal species from gold and gemstone mine site soils were isolated, identified and assessed for their tolerance to varied heavy metal concentrations of cadmium (Cd), copper (Cu), lead (Pb), arsenic (As) and iron (Fe). The identities of the fungal strains were determined based on the in...

In the presence of metal stress, plants can resort to a series of tolerance mechanisms. Therefore field studies should be undertaken in order to evaluate the real role of these mechanisms in stress coping. The aim of this paper was to clarify the biochemical processes behind mercury tolerance in Halimione portulacoides (L.) Aellen (Caryophyllales: Chenopodiaceae) collected in a mercury contamin...