Chandrasekharan Ramakrishnan (1939–2019): The student behind the Ramachandran map

On residues in the disallowed region of the Ramachandran map.

An analysis of the occurrence of nonglycyl residues in conformations disallowed in the Ramachandran plot is presented. Ser, Asn, Thr, and Cys have the highest propensities to exhibit such conformations, and the branched aliphatic residues the lowest. Residues cluster in five regions and there are some trends in the types of residues and their side-chain conformations (chi(1)) occupying these. M...

The Ramachandran Map of More Than 6,500 Perfect Polypeptide Chains

The Protein Data Bank (PDB) [3] is the most important depository of protein structural information, containing more than 42,000 deposited entries today. Because of its inhomogeneous structure, its fully automated processing is almost impossible. In a previous work, we cleaned and re-structured the entries in the Protein Data Bank, and from the result we have built the RS-PDB database [11]. Usin...

the plain x-ray the diagnosis of the acute abdomen_

چکیده ندارد.

A medical student trapped behind the Berlin Wall, 1961.

The Impact of No Child Left Behind on Student Achievement

The No Child Left Behind (NCLB) Act compelled states to design schoolaccountability systems based on annual student assessments. The effect of this Federal legislation on the distribution of student achievement is a highly controversial but centrally important question. This study presents evidence on whether NCLB has influenced student achievement based on an analysis of state-level panel data...