What is the basic chemistry of living organisms?
We introduce the requirements for metabolism (raw
materials and energy), the ATP/ADP energy cycle in cells, auto- and
heterotrophs, photosynthesis and chemosynthesis, and the role played by
liquid water. The goal of today's lecture is to seek insights into the
basic requirements for life from a consideration ... Show More
Oct 2009
Lecture 17: Life on the Edge
Extremophiles are organisms that are adapted to survive in extreme environments. This lecture describes the challenges that extremes of heat, cold, acidity, salinity, and radiation pose to organisms, and show examples of how evolution has nonetheless allowed some organisms to ada ... Show More
46m 54s
<p>La durée de vie d'une étoile peut nous renseigner sur sa composition et sur l'existence éventuelle de la vie dans le cosmos. mais, en dehors du Soleil, il est assez difficile de déterminer l'âge d'une étoile.</p><br><p>L'importance de la masse</p><br><p>En évaluant, grâce à la ... Show More
