In a breakthrough work, Marcus et al. [15] recently showed that every d-regular bipartite Ramanujan graph has a 2-lift that is also d-regular bipartite Ramanujan. As a consequence, a straightforward iterative brute-force search algorithm leads to the construction of a d-regular bipartite Ramanujan graph on N vertices in time 2. Shift k-lifts studied in [1] lead to a natural approach for constru...

In a breakthrough work, Marcus et al. [15] recently showed that every d-regular bipartite Ramanujan graph has a 2-lift that is also d-regular bipartite Ramanujan. As a consequence, a straightforward iterative brute-force search algorithm leads to the construction of a d-regular bipartite Ramanujan graph on N vertices in time 2. Shift k-lifts studied in [1] lead to a natural approach for constru...

It has been shown (Kovacs and Bruckner, 1952; Bruckner et al., 1953a, 1953b, 1953c) that certain bacteria produce glutamyl polypeptides in which the y-glutamyl bond predominates; that produced by Bacillus anthracis (Ivainovics and Erd6s, 1937; Ivanovics and Bruckner, 1937; Hanby and Rydon, 1946) and by Bacillus mesentericus (Bruckner and Ivdnovics, 1937) contains the D-isomer alone, whereas tha...

Neural stem cells (NSCs) play an important role in the developing as well as adult brain. NSCs have been shown to migrate toward sites of injury in the brain and to participate in the process of brain repair. Like NSCs, cultured human neural precursor cells (NPCs) are self-renewing, multipotent cells capable of differentiating into neurons, astrocytes, and oligodendrocytes and of migrating towa...

One of the most important tasks of molecular pharmacology is the deorphanization of the large number of G-protein-coupled receptors with unidentified endogenous agonists. We recently reported the cloning and analysis of expression of a novel human family C G-protein-coupled receptor, termed hGPRC6A. To identify agonists at this orphan receptor, we faced the challenges of achieving surface expre...