A new chitinase inhibitor, CI-4, was isolated from the culture broth of a marine bacterium Pseudomonas sp. IZ208. The structure of CI-4 was determined to be cyclo(L-Arg-D-Pro) by spectral studies and comparison with a synthetic sample. CI-4 showed inhibitory activity against chitinase.

The heavy reliance on incarceration in the United States is unusual relative to U.S. history and relative to the use of incarceration in other nations. By now, the facts are common knowledge. We incarcerate our citizens at a rate that exceeds every other nation and that is multiple times (on the order of five to seven) the rates of other high-income countries. Moreover, since the mid-1970s, our...

In this article, we state the necessary background for cluster algebras and quiver representations to formulate and prove a result of Caldero and Chapoton which gives a nice formula connecting the two subjects. In our exposition, we mostly follow the paper [CC], but we have tried to minimize the reliance of citing outside sources as much as possible. In particular, we avoid having to introduce ...