Filipendula ulmaria In 1897, Felix Hoffmann created a synthetically altered version of salicin, derived from the species, which caused less digestive upset than pure salicylic acid. The new drug, formally acetylsalicylic acid, was named aspirin by Hoffmann's employer Bayer AG after the old botanical name for meadowsweet, "Spiraea ulmaria". This gave rise to the class of drugs known as non-steroidal anti-inflammatory drugs (NSAIDs). A natural black dye can be obtained from the roots by using a copper mordant. A tea made from "Filipendula ulmaria" flowers or leaves has been used in traditional Austrian herbal medicine for the treatment of rheumatism, gout, infections,
Acid-fastness Acid-fastness Acid-fastness is a physical property of certain bacterial and eukaryotic cells, as well as some sub-cellular structures, specifically their resistance to decolorization by acids during laboratory staining procedures. Once stained as part of a sample, these organisms can resist the acid and/or ethanol-based decolorization procedures common in many staining protocols, hence the name "acid-fast". The mechanisms of acid-fastness vary by species, although the most well-known example is in the genus "Mycobacterium", which includes the species responsible for tuberculosis and leprosy. The acid-fastness of "Mycobacteria" is due to the high mycolic acid content of their cell walls, which is responsible