Some of the most fundamental questions in evolution remain unanswered, such as when and how extremely diverse groups of animals - for example reptiles - first evolved. For 75 years, adaptive ...

LIMITATION of vision to a narrow range of wavelengths of radiation is manifestly related to the absorption of radiant energy by protein and water. The importance of light as a directive agent is ...

For patients with recurrent retroperitoneal sarcomas that cannot be treated surgically, treatment choices are limited. These tumors can grow quite large in the abdomen adjacent to vital organs or ...