- A dictionary of medical eponyms

Unna-Pappenheim stain

Related people

Contrast staining with methylene-green-pyronine solution. The most common stain for blood smears. It is mainly used for identifying plasma cells, whose cytoplasm is stained red because of the high content of RNA, and to detect RNA and DNA in tissue sections.

The preparation is fixated for 3 minutes in May-Grünwald stain, diluted with an equal quantity of Aqua destillata and stained for 3 minutes. The solution is poured off and the preparation is further stained with Giemsa solution for 15-20 minutes.


  • P. G. Unna, in:
    Monatshefte für praktische Dermatologie, 1902, 55: 76.

What is an eponym?

An eponym is a word derived from the name of a person, whether real or fictional. A medical eponym is thus any word related to medicine, whose name is derived from a person.

What is Whonamedit?

Whonamedit.com is a biographical dictionary of medical eponyms. It is our ambition to present a complete survey of all medical phenomena named for a person, with a biography of that person.


Whonamedit? does not give medical advice.
This survey of medical eponyms and the persons behind them is meant as a general interest site only. No information found here must under any circumstances be used for medical purposes, diagnostically, therapeutically or otherwise. If you, or anybody close to you, is affected, or believe to be affected, by any condition mentioned here: see a doctor.