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Animals and plants have a complex and effective immune system that protect them from invading microorganisms. The mechanisms of immunity are evolutionarily selected throughout host-pathogen interaction to be tolerant to self-antigens and to recognize nonself molecular patterns. Plants and animals share a germ line encoded diversity of receptors capable of nonself recognition. Somatic rearranging of immunological receptors emerges at early stages of vertebrate evolution, allowing these animals to generate an almost unlimited diversity of receptors. Nevertheless, this recombinational system came with a high price: The potential for self-reactivity.
What determines the capacity of short-term memory?
Jan. 6, 2012 — Short-term memory plays a crucial role in how our consciousness operates. Several years ago a hypothesis has been formulated, according to which capacity of short-term memory depends in a special way on two cycles of brain electric activity.
Rosemania/Creative Commons Dancing stone nymph, Uttar Pradesh, India, early twelfth century.