RobertMD

The specimen from the stove is surely fungal, possible Rhizopus spp, which is a very common strain of fungus at home (specially in old houses) even in leftover breads and pastries. The spores from these fungi are very resilient to disinfection that's why despite the (professional) cleaning done at your household, a lot of it still remained. I cannot extract much information from the photo of the specimen from the drinking straw. It could be anything, really, since the mouth is home to millions of microorganisms that can also be isolated using a petri dish.

Bicarbonate does not bind to heme. It is a byproduct of hydrolysis of carbonic acid as a result of carbon dioxide binding to heme proteins (carbaminohemoglobin). In this process, an H+ ion binds with hemoglobin and bicarbonate (HCO3) is transported out of the RBC in exchange for a chloride (Cl-) ion. Besides ions, oxygen (oxyhemoglobin), carbon dioxide (carbaminohemoglobin), and carbon monoxide (carboxyhemoglobin) are known to freely and reversibly bind with heme.