Technetium
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| Electron affinity || -53 kJ/mol
Technetium () is the lightest chemical element with no stable isotope . It has atomic number 43 and is given the symbol Tc. The chemical properties of this silvery grey, crystalline transition metal are inte more
Enzyme inhibitor protease in a complex with the protease inhibitor ritonavir . The structure of the protease is shown by the red, blue and yellow ribbons. The inhibitor is shown as the smaller ball-and-stick structure near the centre. Created from PDB 1HXW .
Enzyme inhibitors are molecule s that more
Asperger syndrome
Asperger syndrome (U.S. pronunciation /, also called Asperger's syndrome, Asperger's disorder, Asperger's or AS) is one of several autism spectrum disorders (ASD) characterized by difficulties in social interaction and by restricted, stereotyped interests and activities. AS is more
Georg Forster , 1781
Johann Georg Adam Forster (November 27 1754 Many sources, including the biography of Thomas Saine, list the birthdate as November 26 ; according to Ulrich Enzensberger, Ein Leben in Scherben, Frankfurt 1996, ISBN 3-423-13248-5, the baptism registry of St Peter in Danzig list more
G. Ledyard Stebbins
George Ledyard Stebbins, Jr. (January 6 1906 – January 19 2000 ) was an American botanist and geneticist who is widely regarded as one of the leading evolutionary biologists and botanists of the 20th century. Stebbins received his Ph.D. in botany from Harvard Uni more