A charcoal heating material, such as charcoal briquettes, includes a porous structure that facilitates the flow of oxygen about the charcoal, and thereby, enables the briquettes to ignite easily and quickly. The mechanism also provides ability for a consumer to interact with that data to complete a purchase from within the publisher’s website or application. This allows for an increase in the effective concentration or a decrease in systemic exposure of mitomycin C in a patient. Further, a tunnel junction is realized by increasing the concentration of a doping element in at least one or preferably both of the p-type semiconductor 3a and the n-type semiconductor 6 in a region where they are in contact with each other, thereby keeping ohmic characteristics between the semiconductor and the electrode good. A second end of the electrode is disposed through the handle and is exposed from outside the handle.