Thesis--PlanB (M.S.)--University of Wisconsin--Stout, 2002. / Includes bibliographical references.

Inaug.-Diss.--Basel.

Inaug.-Diss.--Basel.

Studies on the ability of Verticillium albo-atrum Reinke & Berth, to grow on a synthetic basal medium incorporating various organic and inorganic sources of nitrogen indicate that nitrate serves as the best single source of nitrogen. V. albo-atrum is able to utilize the known inorganic intermediates of nitrate reduction with the exception of hydroxylamine which was toxic at the concentration used. Enzymatic studies, using homogenates of mycelium grown on the synthetic medium with nitrate or peptone as the source of nitrogen, indicate the adaptive nature of the enzymes responsible for nitrate reduction since only the nitrate-grown mycelium was found to reduce nitrate. On the basis of evidence presented, it is concluded that the adaptive nature of nitrate reductase and the preferential utilization of nitrate by V. albo-atrum may be factors in the effects of nitrogen nutrition of the host on the incidence and severity of Verticillium wilt. / Land and Food Systems, Faculty of / Graduate

This study was conducted to determine and compare indoor mold concentrations of total mold, five target taxa, and unidentified mold taxa using culturable/viable mold sampling (on DG-18 and MEA) and total mold spore sampling concurrently. Samples were taken within two locations of 22 single-family dwellings. Paired comparisons of culturable/viable mold concentrations revealed that DG- 18 samples had significantly higher total colony counts than MEA samples and near significantly higher counts of Aspergillus. Total mold spore concentrations were an average of 16-21 times greater than culturable/viable mold concentrations. The use of both sampling techniques concurrently allowed apparent viability ratios to be calculated. Significant differences in apparent viability were observed on the two media for total mold and Cladosporium, and near significance for Aspergillus; higher ratios were observed using DG-18. These studies indicate that DG-18 may be a superior medium for culturable/viable mold sampling and significant apparent viability differences exist among mold taxa quantified. / Department of Natural Resources and Environmental Management

No description available.

M.Tech.

No description available.

No description available.

Thesis (M.S.)--University of North Carolina at Wilmington, 2005. / Includes bibliographical references (leaves: [13]-17)