A pigment formed in blood-rich tissues that come in contact with aqueous solutions of formaldehyde that have acidic pH values.
What’s the infamous chemical that makes NASA’s new life discovery so amazing, and why is it such a big deal?Few poisons are more notorious than arsenic. So, scientists were recently shocked to find that a strange bacterium called Halomonadaceae (a type of protobacteria) in Mono Lake, California, is actually thriving on it. The finding is blowing researchers’ minds, showing how much more there is to be discovered about the types of life forms that may exist both on Earth and in space. To give you an idea …
Grey vs GrayGrey and gray are both accepted in the English language. They refer to a color of a neutral tone between black and white, and can also be used metaphorically to convey gloom and dullness. However, gray is the more popular spelling in the US, while grey reigns supreme in the UK. For centuries, the one letter difference between gray and grey has left people wondering …
- formal logic,
- formal mode,
- formal system,
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.