 The study found that two molds, aspegillus flavus and penicillium chrysogenum, can grow on and inside of both fecus sycamoras and tectonograndes wood blocks. However, the wood block made of tectonograndes was more resistant to mold growth than the fecus sycamoras would block. The study also found that the carbon and oxygen atom percentages in the fecus sycamoras would block decreased significantly after it was inoculated with aspegillus flavus, while the carbon and oxygen atom percentages in the tectonograndes would block decreased after it was inoculated with penicillium chrysogenum. This suggests that the two molds have different effects on the carbon and oxygen atom percentages in the two wood types. Overall, this study shows that the two molds can cause significant damage to both wood types, but the tectonograndes wood appears to be more resistant to mold growth. This article was authored by Meiser M.A. Mansour, Wafa'a Mohammed, Ahmed A.A. L. Setoui, and others.