Restorative material and other tooth-specific variables associated with the decision to repair or replace defective restorations: findings from the dental PBRN.

Objectives: Using data from dentists participating in The Dental Practice-Based Research Network (DPBRN), the study had 2 main objectives: (1) to identify and quantify the types of restorative materials in the existing failed restorations; and (2) to identify and quantify the materials used to repair or replace those failed restorations.

Methods: This cross-sectional study used a consecutive patient/restoration recruitment design. Practitioner-investigators recorded data on consecutive restorations in permanent teeth that needed repair or replacement.

Development of an automated on-line electrochemical chlorite ion sensor.

A sensor system for the automatic, in-line, determination of chlorite ion is reported. Electroanalytical measurements were performed in electrolyte-free liquids by using an electrochemical probe (EC), which enables in-line detection in high-resistance media such as disinfected water. Cyclic voltammetry scan rate studies suggest that the current arising from the oxidation of chlorite ion at an EC probe is mass-transfer limited.

Rapid analysis of perchlorate, chlorate and bromate ions in concentrated sodium hypochlorite solutions.

A sensitive, rapid, and rugged liquid chromatography with tandem mass spectrometry (LC-MS/MS) method for measuring concentrations of perchlorate, chlorate, and bromate ions in concentrated sodium hypochlorite solutions is presented. The LC-MS/MS method offers a practical quantitation limit (PQL) of 0.05 microg L(-1) for ClO(4)(-), 0.

Childhood asthma and environmental exposures at swimming pools: state of the science and research recommendations.

Objectives: Recent studies have explored the potential for swimming pool disinfection by-products (DBPs), which are respiratory irritants, to cause asthma in young children. Here we describe the state of the science on methods for understanding children's exposure to DBPs and biologics at swimming pools and associations with new-onset childhood asthma and recommend a research agenda to improve our understanding of this issue.

Data Sources: A workshop was held in Leuven, Belgium, 21-23 August 2007, to evaluate the literature and to develop a research agenda to better understand children's exposures in the swimming pool environment and their potential associations with new-onset asthma.

An improved colorimetric method for chlorine dioxide and chlorite ion in drinking water using lissamine green B and horseradish peroxidase.

Lissamine Green B (LGB) was carefully selected as a potential candidate for the development of a new U.S. Environmental Protection Agency (EPA) method that is intended for use at water utilities to determine chlorine dioxide (ClO2) in drinking water.

Unilateral shivering: a result of lateral medullary infarction.

Shivering is mediated via the predominantly uncrossed reticulospinal tract. We report a case of a patient with left lateral medullary tract infarct involving the reticulospinal tract who displayed ipsilateral absence of shivering during a febrile episode. The physiology and anatomy of shivering and the reticulospinal tract is reviewed.

Experimental results from the reaction of bromate ion with synthetic and real gastric juices.

This study was designed to identify and quantify the effects of reducing agents on the rate of bromate ion reduction in real and synthetic gastric juice. This could be the first element in the sequence of a pharmacokinetic description of the fate of bromate ion entering the organism, being metabolized, and subsequently being tracked through the system to the target cell or eliminated. Synthetic gastric juice containing H+ and Cl- did exhibit reduced bromate ion levels, but at a rate that was too slow for a significant amount of bromate to be reduced under typical stomach retention time conditions.

Biceps pain as the presenting symptom of Parkinson disease: effective treatment with L-dopa.

Parkinson disease can present remarkably as shoulder pains that may long precede the clinical diagnosis. A case is presented in which, during a 2-year period, both lower biceps brachii became exquisitely painful, with both the pain and the "frozen shoulders" responding promptly to the initiation of L-dopa therapy.