A malignant fibrous histiocytoma with a predominance of myxoid areas that resemble primitive mesenchymal tissue. [myxo- + L. fibra, fiber, + G. sarx, flesh, + -Åma, tumor]. /myxoÂ·fiÂ·broÂ·sarÂ·coÂ·ma/ (-fiâ³bro-sahr-koÂ´mah) older term for the myxoid subtype of malignant fibrous histiocytoma.
1 Ammonium ion (NH4+), the most reduced natural specie of nitrogen, and the most biologically available in an oxygen-less environment;  Nitrate ion (NO3-), the most oxidized form of nitrogen and mostly usable in an aerobic environment;
ModernAlchemist Transform and Transcend 7+ Year Member 1,269. 15. Jan 20, 2008. Limbo. I saw this on a practice test and couldn't really get my head around it. Here is the structure being considered: The question asks which nitrogen is most basic out of 2, 1, 7, or 9. I thought that the bond with more s-character increased in acidity, but the answer is supposed to be 7. I understand that the lone pairs of the Nitrogens on the left ring are tied up in resonance and on the right are tied up in aromaticity, but I still don't see how you can factor all that in to answer the question.