Mental capacity stress

Tolerance to metal stress relies on plant capacity to detoxify metals having entered cells. The postulated mechanisms involve biochemical detoxification, for example by binding to organic acids (especially citrate) or proteins like ferritin, metallothioneins and phytochelatins, and finally compart-mentalization of the metal within the cell. In most plant cells the vacuole comprises more than 80-90% of the cell volume and is acting as a central storage compartment for ions (Briat et al. 1999). 

Overload—Operators may experience a state of overload when the demands of a task are beyond their limited attentional capacity (Young and Stanton, 2002). Various consequences are associated with overload, including mental saturation, fatigue, stress, and human error. 

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