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...system...The new discipline of astrobiology that is, the science of searching for extraterrestrial life, is not only rapdly growing, but has also captured the public imagination. This free course, Icy bodies: Europa and elsewhere, examines the emergence of icy satellites of distant planets as potential sites of extraterrestrial life, looks at the potential for life on...

...systems that suit their physiological function. The main focus of this topic is cellular communication that occurs when extrinsic stimuli bind to receptors on their target cells. Although not all cellular communication relies on the activation of receptors, it is the most common mechanism by which cells sense their environment or communicate with each other. The central...

...systems as well as lungs, kidneys, skin and eyes. Fetuses and young children are most susceptible, with studiesdocumenting mental retardation in a small proportion of children in fishing communities of countries such as Brazil and China. The Convention takes its name from the world’s worst mercury poisoning incident, which affected thousands of people who ate...