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CONCESSION: Like the strawman, the concession technique presents the opposing viewpoint, but it does not proceed to demolish the opposition. Instead, it concedes that the opposition has a valid point but that, even so, the positive argument is the stronger one. This method is particularly valuable when you know your reader holds the opposing view.
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Yeasts, like many other microorganisms, have the ability to absorb and accumulate significant amounts of toxic metals from their surrounding environment [ 105 , 107 ]. Adaptation to metal toxicity has resulted in yeast cells using a variety of detoxification mechanisms that cause activities such as chelation, bio-precipitation bio-sorption and extracellular sequestration. The variation in particle size, location, and particle properties is due to the different mechanisms used by yeast organisms to form and stabilise the nanoparticles during synthesis [ 170 ]. Studies by Dameron et al. have shown that when Candida glabrata was exposed to cadmium salts the resulting intracellular synthesis produced CdS quantum dots [ 62 ]. Similar studies using Schizosaccharomyces pombe cells have also been able to find a link between the formation of CdS quantum dots and the growth phase of the yeast [ 110 , 192 ]. Moreover, intracellular synthesis of PbS quantum dots was possible when Torulopsis sp. were exposed to Pb 2+ ions [ 137 ]. Also, Au nanoparticles ranging in size from a few nanometres up to around 100 nm have been intracellularly synthesized using Pichia jadinii .