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Biomedical subjects

J Rouch

Publications and source records attributed to J Rouch.

25 records · Page 2Linked to original sources
PubMed1987

Formaldehyde source interaction studies under whole-house conditions.

This study was designed to determine the effect of source combinations on formaldehyde levels under whole-house conditions. Evaluations were conducted on particleboard (applied as subflooring) and hardwood plywood panelling (applied as a wall covering) both singly and in combination, and on urea-formaldehyde foam insulation and particleboard. Formaldehyde source combination/interaction evaluations revealed several different outcomes, including no augmentation of formaldehyde levels, a slight augmentation (30-50%) and complete addivity. Additivity was observed for regular and low emission grade particleboard and hardwood plywood combinations and for urea-formaldehyde foam insulation and particleboard subflooring. In contrast, controlled chamber studies employing samples of the same wood materials revealed no additive effects. Results of these studies raise questions about the reliability of using laboratory evaluations alone to predict formaldehyde levels under real-world residential conditions.

Journal Article↗
PubMed1986

Mitigation of residential formaldehyde contamination by indoor climate control.

The effectiveness of indoor climate as a mitigation measure for indoor formaldehyde contamination was studied in a mobile home. The effects of nine indoor climate regimes on formaldehyde levels were evaluated for the temperature and humidity ranges of 20 degrees C to 30 degrees C and 30% RH to 70% RH. Formaldehyde levels at the lowest combination of temperature and relative humidity (20 degrees C, 30% RH) were only 20% of those measured at the highest combination of temperature and relative humidity (30 degrees C, 70% RH) evaluated. Reducing temperature alone (from 30 degrees C to 20 degrees C) was shown to result in an approximate 70% reduction in formaldehyde levels. Reducing relative humidity alone (from 70% to 30%) resulted in an approximate 40% reduction in formaldehyde levels. A high linear correlation was observed between formaldehyde levels and temperature and between formaldehyde levels and relative humidity. Analysis of energy consumption and associated costs indicated that temperature reduction from 25 degrees C to 20 degrees C during the cooling season would increase energy usage costs by about 20%; temperature reduction in the heating season would result in both reduced formaldehyde levels and reduced energy costs. Although effective, humidity control--particularly to 30% under summertime conditions--appears to be prohibitively costly. The relationship between temperature and formaldehyde levels suggests that climate control also may be appropriate for reducing indoor levels of other continuously generated contaminants.

Environmental Exposure↗
PubMed1977

Mixed lymphocyte reaction and graft survival in forty cadaveric renal transplants.

The value of the MLR in predicting graft outcome was evaluated in forty cadaveric grafts. The MLR was assessed by the one and two way stimulation index (SI), the relative response (RR), and the stabilized relative response (SRR). Graft function was assessed by function at 3 and 6 months after transplantation, and a rejection grading based on the number and severity of rejection episodes during the first 3 months after transplantation. No correlation was found between the MLR and graft outcome in these patients.

Cadaver↗