Peter Klatzow\u27s Six Concert Etudes for Marimba : a performer\u27s guide

Peter Klatzow has become one of the most prominent composers for keyboard percussion over the last thirty years. Several of his works have found their way into the standard repertoire for percussion. The primary purpose of this document is to serve as a performer’s guide to his Six Concert Etudes for Marimba. This document is intended to help percussionists become less intimidated by Klatzow’s music, and make it more approachable. By studying the technical and musical demands within the Concert Etudes, a percussionist will be better prepared to perform Klatzow’s other keyboard percussion compositions. Both technical and musical advice is provided for each etude. My research has included multiple performances of each etude, evaluation of techniques used, interviews with the composer, and an examination of his other works. A portion of my research has involved examining other documents that give a performer’s perspective on works for keyboard percussion. These documents include Robert Van Sice’s “The Marimba Music of Akira Miyoshi,” Eric Hollenbeck’s “Peter Klatzow’s Dances of Earth and Fire: An Analysis,” I-Jen Fang’s “The 1986 National Endowment of the Arts Commission: An Introspective Analysis of Two Marimba Works, Reflections on the Nature of Water by Jacob Druckman, and Velocities by Joseph Schwantner,” and Daniel Druckman’s “Marimba Master Class on Reflections on the Nature of Water.” In addition to the performer’s guide, this document includes information about the commission of the Six Concert Etudes for Marimba. For the musicians interested in biographical information about Peter Klatzow, a brief biography is also included. This document provides a detailed list of Klatzow’s entire works for percussion to date, including significant information about each work. The percussion catalog is separated into four categories: solo works, chamber, large ensemble works, and concertos

Mutations in Genes Encoding Sorting Nexins Alter Production ofIntracellular and Extracellular Proteases in Aspergillus nidulans

XprG, a putative p53-like transcriptional activator, regulates production of extracellular proteases in response to nutrient limitation and may also have a role in programmed cell death. To identify genes that may be involved in the XprG regulatory pathway, xprG2 revertants were isolated and shown to carry mutations in genes which we have named sogA-C (suppressors of xprG). The translocation breakpoint in the sogA1 mutant was localized to a homolog of Saccharomyces cerevisiae VPS5 and mapping data indicated that sogB was tightly linked to a VPS17 homolog. Complementation of the sogA1 and sogB1 mutations and identification of nonsense mutations in the sogA2 and sogB1 alleles confirmed the identification. Vps17p and Vps5p are part of a complex involved in sorting of vacuolar proteins in yeast and regulation of cell-surface receptors in mammals. Protease zymograms indicate that mutations in sogA-C permit secretion of intracellular proteases, as in S. cerevisiae vps5 and vps17 mutants. In contrast to S. cerevisiae, the production of intracellular protease was much higher in the mutants. Analysis of serine protease gene expression suggests that an XprG-independent mechanism for regulation of extracellular protease gene expression in response to carbon starvation exists and is activated in the pseudorevertants