Consideration of the likely rates of other possible atmospheric loss mechanisms leads to the conclusion that the atmospheric lifetime of F(CF2CF2)nCH2CH2OH (n g 2) is determined by reaction with OH radicals and is approximately 20 d.

sPublication of the International Union AgalnSt Cancer USE OF PERMANENT HAIR DYES AND BLADDER-CANCER RISK Manuela GAGO-DOMINGUJE.ZE-s,teban CASTELAOJi,an-Min YUAK,Mimi C.

LAW OFFICES Keller and Heckman uOSERh C KELLER uEROme h h(Cman CHARLES M mUHAN WILLIAM H O*0CSANI, JR macCOlm o MaCAHTMUR WATNC V ILACA TERRENCE O jOnCS MARTIN W bercovici jOhn* cldred carolec ma**is M'CHACL r morrone MAM rox EVENS JOHN B OUBECa retea l < kA caul CHRISTINE A M(AOM(R sShirley TyjiMoro Lawrence a malRRin ralRm a.

Federal Register/Vol. 71, No. 1 9 /Monday, January 30, 2006/Notices 4913 SUMMARY: The EPA Science Advisory Board (SAB) Staff Office announces a public teleconference meeting of the chartered SAB to discuss a draft SAB report, EPA's Draft Risk Assessment of the Potential Human Health Effects Associated with Exposure to Perfluorooctanoic Acid (PFOA): A Review by the PFOA Review Panel of the EPA Science Advisory Board.

Garabrant Background: Pancreatic cancer is the fifth leading cause of cancer-related mortality in the United States.

Among these subjects, leading to the adverse health outcomes after only 1788 subjects had a morning exposure to PFCs are largely unknown. examination and had fasting plasma glucose, However, recent studies using advanced insulin and triglyceride (TG) data available.

Letters Scientific Evidence Continues to Support Fluoridation of Public Water Supplies To the Editor:--I thank Paul Connett for the opportunity to provide further information about the benefits of water fluoridation.1 I am not surprised by his unwillingness to accept previous reviews of the literature on fluoridation; this is a consistent aspect of his previous presentations on the subject.2 Connett is a critic of fluoridation, having previously been critical of the York review of water fluoridation.3 McDonagh and Kleijnene, as well as Phipps, Orwoll, Mason, and Cauley, have responded to Connett's criticism.4 The title and purpose of my paper was to focus on the available evidence of the relationship between water fluoridation and the environment.5 Connett provides no specifics that refute any of the evidence I presented that there is no harm from water fluoridation.

American Journal of Epidemiology Copyright 2001 by the Johns Hopkins University Bloomberg School of Public Health All rights reserved Cancer Mortality among Workers Exposed to Amphibole-free Chrysotile Asbestos Vol. 154, No. 6 Printed in U.S.A.

European Journal ofEpidemiology 16: 411-417, 2000, 2000 Kluwer Academic Publishers.

Severity of Risk to Miners Extended exposure to airborne respirable dust can lead to the development of debilitating and potentially deadly lung diseases for mine workers.

AR226-1030A024 BACK TO MAIN Im p in g er Studies o f V o la tility o f FC -95 and FC -143 Intoduction and Purpose: Thermospray mass spectrometry was used to quantitate a number of samples for FC-143 and FC-95.

The mechanisms and pathways leading to the presence o f PFOS in human blood are not well characterized but likely involved environmental exposure to PFOS or to precursor molecules and residual levels of PFOS or PFOS precursors in industrial and commercial products.

The introduction of molecular cytogenetics, especially of multicolor fluorescence in situ hybridization (FISH) leads to better results and identification of previously cryptic chromosomal aberrations in leukemia cytogenetics and furthermore make interphase nuclei accessible (1,2).

Gordon has proposed a tentative metabolic pathway for many of the N-alkylated perfluorooctane sulfonamides which consists of successive N-dealkylations leading to perfluorooctane sulfonic acid as the final common metabolite (Fig. 1).

The three RAS genes code for proteins that are nearly identical except for the C-terminus, and recent Correspondence: Dr J Wiemels, Laboratory for Molecular Epidemiology, University of California San Francisco, 500 Parnassus Ave, MU-420W, Box 0560, San Francisco, CA 94143, USA; Fax: 1 415 476-6014; E-mail: wiemels@itsa.ucsf.edu Received 28 September 2004; accepted 29 November 2004; Published online 27 January 2005 work has shown that these differences lead to discrete subcellular locations of RAS proteins, and distinct interacting proteins including nucleotide exchange and GTPase-activating proteins (reviewed in Hingorani and Tuveson9 and Ehrhardt et al10).