the absence of mental changes and family history. Secondly, the meningeal reaction was not present. Thirdly, the lesion in the corpus stiatum was strictly confined to the caudate nuclei with normal lentiform nuclei. The thalamus showed no pathological abnormality. Fourthly, it is stated by various authors that the lesion in the corpus striatum affects principally the small ganglion cells with s...

Analytic bond-order potentials ~BOP’s! are derived for the s and p bond orders by approximating the many-atom expansion for the bond order within the two-center, orthogonal tight-binding ~TB! model. The analytic expression, BOP4, is obtained by retaining terms to four levels in the continued fractions for the appropriate Green’s functions and describes the s bonds in the dimer C2 , the tetrahed...

While for 25 years it had been clear the DNA contained the basic genetic information, by 1960 it was still not at all clear how that information was expressed. How did a difference in the sequence of nucleotide bases translate into the differences between an elephant and a flea? The boundaries of the problem had been roughed out even before the era of Watson-Crick DNA. It was shown that all of ...

In 1961, Crick, Barnett, Brenner, and Watts-Tobin (Crick et al., 1961) designed an elegant experimental strategy to determine the nature of the genetic code. Remarkably, they reached the correct conclusion despite the absence of technology to analyze and compare DNA and protein sequences.