Chromatophore chromatophores mediate background adaptation on exposure to dark (top) and light environments (bottom).
Chromatophores are pigment -containing and light-reflecting cells found in amphibian s, fish , reptile s, crustacean s, and cephalopod s. They are largely responsible for generati more
Enzyme kinetics from E. coli with its two substrates, dihydrofolate (right) and NADPH (left), bound in the active site. The protein is shown as a ribbon diagram , with alpha helices in red, beta sheets in yellow and loops in blue. Generated from 7DFR .
Enzyme kinetics is the study of the chemic more
History of biology 's evolution-themed poem The Temple of Nature shows a goddess pulling back the veil from nature (in the person of Artemis ). Allegory and metaphor have often played an important role in the history of biology.
The history of biology traces the study of the living world from anci more
Tooth development
Tooth development is the complex process by which teeth form from embryo nic cells , grow , and erupt into the mouth . Although many diverse species have teeth, non-human tooth development is largely the same as in humans. For human teeth to have a healthy oral environment, more
Xenon
Xenon ( in the UK, in the US) is a chemical element that has the symbol Xe and atomic number 54. A colorless, heavy, odorless noble gas , xenon occurs in the earth's atmosphere in trace amounts. Although generally unreactive, xenon can undergo a few chemical reaction s such as the forma more