Spelling suggestions: "subject:"house duty"" "subject:"mouse duty""
1 |
Ecology of the house dust mite Dermatophagoides pteronyssinus (Trouessart)Hay, David B. January 1991 (has links)
No description available.
|
2 |
House Dust Mite Induced Gene Expression and Cytokine Secretion by Human Dermal FibroblastsRockwood, Jananie 18 September 2012 (has links)
No description available.
|
3 |
Specific immunotherapy for perennial allergic rhinitisTabbah, Khaldoun January 1999 (has links)
No description available.
|
4 |
Crystallographic and biochemical analysis of three distinct hydrolases : dermatophagoides pteronyssinus 1(Der p1), momordin and the bacterial carbon-carbon hydrolase, MhpCDunn, Graham Spencer January 2000 (has links)
No description available.
|
5 |
The T cell receptor genes and the specific immunoglobulin E responseTraherne, James Arnold January 2000 (has links)
No description available.
|
6 |
The effect of providing bedding encasings on adherence to dust mite control procedures in pediatric asthma patientsJoseph, Karen Elizabeth. January 2000 (has links)
Thesis (M.A.)--West Virginia University, 2000. / Title from document title page. Document formatted into pages; contains viii, 123 p. Includes abstract. Includes bibliographical references (p. 63-68).
|
7 |
An investigation into the effects of annual residential change on asthmatic symptoms in university studentsLeitch, David Neil January 2001 (has links)
No description available.
|
8 |
Validation of electrostatic dust collectors (EDCs) as effective passive samplersKilburg-Basnyat, Brita Jane 01 December 2015 (has links)
Electrostatic Dust Collectors (EDCs) are a passive sampling method that has not yet been fully validated. Our first study investigated the effect of EDC mailing and EDC deployment in front of and away from heated ventilation on endotoxin concentrations. Endotoxin sampling efficiency of heated and unheated EDC cloths was evaluated. EDCs express mailed cross-country yielded no significant changes in endotoxin concentrations when dust-only samples were compared to high quality control (QC) spiked-EDCs (p=0.21) and low QC spiked-EDCs (p=0.16). EDCs were deployed in 20 apartments with one EDC placed in front of the univent heater and another EDC placed on a built-in bookshelf. Endotoxin concentrations were significantly different (p=0.049) indicating that EDC placement impacts endotoxin sampling. Heated and unheated EDCs were deployed for 7 days in farm homes. There was a significant difference between endotoxin concentrations (p=0.027). The electrostatic charge of 12 heated and 12 unheated EDC cloths were significantly different (p=0.009). These studies suggest that heating cloths may diminish their electrostatic charge and endotoxin sampling capabilities.
The EDC sampling time needed to achieve detectable and reproducible loading for bioaerosols has not been systematically evaluated. In our second study, EDCs were deployed in 15 Iowa farm homes for 7-, 14-, and 28-day sampling periods to determine if endotoxin and allergens could be quantified and if loading rates were uniform (i.e. doubling from 7 to 14 days and 14 to 28 days and quadrupling from 7 to 28 days). Loadings between left and right paired EDC cloths were not significantly different and were highly correlated for endotoxin, total protein, and cat (Fel d1), dog (Can f1) and mouse (Mus m1) allergens (p<0.001). EDC endotoxin sampling had close agreement between paired samples (Pearson p=0.96, p<0.001). EDC endotoxin loading doubled from 7 to 14-day deployments but the loading rate decreased from 14 to 28 days of sampling with only a 1.38 fold increase. Allergen exposure assessment using EDCs was less satisfactory.
Paired EDCs and daily Button aerosol samplers (BS) were used in our third study to concurrently sample endotoxin in 10 farm homes during 7 day periods in summer and winter. Winter sampling included an optical particle counter (OPC) for particulate size and number concentration data. OPC particulate matter (PM) data were divided into PM2.5 and PM10-2.5. Summer sampling yielded geometric mean and geometric standard deviation values of 0.82 EU/m3 (2.7) for inhalable aerosol BS and 737 EU/m2 (1.9) for EDCs. Winter values were 0.52 EU/m3 (3.1) for BS and 538 EU/m2 (3.0) for EDCs. Seven day endotoxin values of EDCs were significantly and highly correlated with the 7-day BS sampling averages (p=0.70; p<0.001). An Analysis of Variance indicated a 2.37-fold increase in EDC endotoxin concentrations for each unit increase of the ratio of PM2.5 to PM10-2.5. A 10-fold increase in BS endotoxin concentrations was associated with a 12.2-fold increase in EDC endotoxin concentrations.
Our fourth study established QC protocols use of EDCs in large field studies. QCs were developed for endotoxin, peptidoglycan, and glucan for analysis alongside the Agricultural Lung Health study EDC samples. The coefficient of variation percentage (CV) for each QC was used to determine variability. For each QC, 20 EDC cloths were analyzed to establish an acceptable range (mean ± 3 standard deviations). Two QCs were established for endotoxin analysis. The high QCs were dust-spiked EDCs with a CV of 29.7%. The low QCs were spiked with E. coli standard and had a CV of 15.6%. One QC was established for peptidoglycan analysis using dust-spiked EDC extracts. Two glucan QCs were established using dust-spiked EDCs with a high CV (51.7%) and yeast-spiked EDCs with a CV of 26.0%. Endotoxin and glucan concentrations of AGLH EDC samples were found to be significantly correlated (p=0.71; p<0.0001). In conclusion, EDCs are an effective passive sampling method for endotoxin exposure assessment in farm homes.
|
9 |
Toxicity Analysis of Polycyclic Aromatic Hydrocarbon MixturesNaspinski, Christine S. 16 January 2010 (has links)
Polycyclic aromatic hydrocarbons (PAHs) are widely distributed in the
environment and are generated by many sources. Though the potential of PAH-rich
mixtures to cause health effects has been known for almost a century, there are still
unanswered questions about the levels of PAHs in the environment, the potential for
human exposure to PAHs, the health effects associated with exposure, and how genetic
susceptibility influences the extent of health effects in individuals.
The first objective of this research was to quantify concentrations of PAHs in
samples of settled house dust collected from homes in Azerbaijan, China, and Texas.
The trends of PAH surface loadings and percentage of carcinogenic PAHs were China
> Azerbaijan > Texas, indicating that the risk of health effects from exposure to PAHs in
house dust is highest in the Chinese population and lowest in the Texas population.
PAHs in China and Azerbaijan were derived mainly from combustion sources; Texas
PAHs were derived from unburned fossil fuels such as petroleum.
The second objective of this research was to investigate the effect of pregnane
X receptor (PXR) on the genotoxicity of benzo[a]pyrene (BaP). BaP treatment resulted
in significantly lower DNA adduct levels in PXR-transfected HepG2 cells than in
parental HepG2 cells. Total GST enzymatic activity and mRNA levels of several
metabolizing enyzmes were significantly higher in cells overexpressing PXR. These
results suggest that PXR protects cells against DNA damage by PAHs such as BaP,
possibly through a coordinated regulation of genes involved in xenobiotic metabolism.
The third objective of this research was to investigate biomarkers of exposure in
house mice (Mus musculus) exposed to PAH mixtures in situ. Mice and soil were
collected near homes in Sumgayit and Khizi, Azerbaijan. Mean liver adduct levels were
significantly higher in Khizi than in Sumgayit. Mean lung and kidney adduct levels were similar in the two regions. The DNA lesions detected may be a combination of
environmentally-induced DNA adducts and naturally-occurring I-compounds. PAHs
were present at background levels in soils from both Khizi and Sumgayit. It appears
that health risks posed to rodents by soil-borne PAHs are low in these two areas.
|
10 |
The Effect of Carpet Fiber on the Growth of Dermataphagiodes farniae in a Controlled EnvironmentAndes, Glenda Gilmore 07 January 2001 (has links)
Mites are endemic and allergy to mite excreta and parts is one of the most common allergies. Health care practitioners have recommended the removal of carpets from homes of people with mite allergies. Little, if any, consideration is given to the fact that some persons may benefit directly from the presence of carpet in their homes. In the allergen and mite research literature, carpets are rarely described as having unique characteristics and are generally referred to as a generic entity. Carpets, however, do have unique characteristics that define their construction, appearance, wearability, and cleanability.
Seventy-two pieces of commercially available, residential flooring materials were inoculated with identical numbers of mites, Dermatophagiodes farinae, and placed in the Textiles Conditioning Lab at Virginia Tech. The mites and carpet pieces were maintained in the lab, under identical, environmentally controlled conditions for 6 weeks, then the mites were extracted and counted.
On the basis of the results of statistical tests run on the study data, the null hypothesis, that there is no difference between the numbers of mites grown on the different flooring conditions, was rejected. Statistically significant differences exist between the hard floor and the nylon carpet, between hard floor and olefin carpets, but no difference between hard floor and wool carpet.
Nylon was the carpet fiber that was most supportive of the growth of house dust mites, olefin was the second most supportive, and wool carpet and hard floor were similar in being the least supportive. / Master of Science
|
Page generated in 0.6006 seconds