This document describes the details of how the X graphs of Lubotzky, Phillips, and Sarnak are produced in Matlab. Included is a (hopefully minimal) description of the theory behind the construction. The graphs were originally defined only when p and q are both congruent to 1 mod 4, but an extension of the construction to all odd primes is given in the book by Davidoff, Sarnak, and Valette, in w...

In the last decades, the Masson pine (Pinus massoniana) forests in Chongqing, southwest China, have increasingly declined. Soil acidification was believed to be an important cause. Liming is widely used as a measure to alleviate soil acidification and its damage to trees, but little is known about long-term effects of liming on the health and growth of declining Masson pine forests. Soil chemic...

Abstract Excessive epidural fibrosis attached to the dura mater is major cause of recurrent failed back surgery syndrome after spine surgery. Neutrophil extracellular traps (NETs) promote fibrosis, raising possibility that DNA backbone NETs may be a potential target in therapy fibrosis. Human body temperature-sensitive hydroxypropyl chitin hydrogel solutions were prepared encapsulate DNase I, w...

The ontogeny of visual context effects: Tracing effects of culture and the urban environment on the development of the Ebbinghaus illusion in British and Namibian observers Andrew J. Bremner, Martin Doherty, Serge Caparos, Jan de Fockert, Karina J. Linnell, & Jules Davidoff Department of Psychology, Goldsmiths, University of London School of Psychology, University of East Anglia Département de ...

CancerDrug Pricing andReimbursement: Lessons for theUnited States From Around theWorld DANIEL A. GOLDSTEIN, MICHAL SARFATY Davidoff Cancer Center, RabinMedical Center, Petach Tikvah, Israel; Winship Cancer Institute, Emory University, Atlanta, Georgia, USA; Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel Disclosures of potential conflicts of interest may be found at the end of...

This paper responds to the research note in this issue by Van Dyke et aL concerning the use of SERVQUAL, an instrument to measure 1Robert Zmud was the accepting senior editor for this paper.

[1] Lava dome eruptions are commonly characterized by large fluctuations in discharge rate with cyclic behaviour on time-scales ranging from hours to decades. Examples include Bezymianny volcano (Russia), Merapi (Java), Santiaguito (Guatemala), Mt St Helens (USA), Mt Unzen (Japan), and Soufrière Hills volcano (Montserrat). Previous models have assumed simple cylindrical conduits for magma trans...