Sianna Alcorn

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BACKGROUND Asthma is the most important chronic disease of childhood. The U.S. Environmental Protection Agency has concluded that children with asthma continue to be susceptible to ozone-associated adverse effects on their disease. OBJECTIVES This study was designed to evaluate time trends in associations between declining warm-season O(3) concentrations(More)
The authors evaluated the association between ambient ozone levels and cardiac mortality in California's South Coast Air Basin during the period 1983-2000 and compared inferences from several types of marginal structural model (MSM) estimators. The authors undertook an ecologic study during the high-ozone seasons among persons over age 55 years. In contrast(More)
We have constructed a vector to assess the ability of heterologous signal sequences to function in the endophytic bacterium Clavibacter xyli subsp. cynodontis. This secretion reporter contains the phoA gene from Escherichia coli from which the promoter and signal sequences have been deleted. Signal sequences of streptomycete origin were cloned into the(More)
Clavibacter xyli subsp. cynodontis (Cxc) is a xylem-inhabiting bacterial endophyte of Bermudagrass. This organism is classified with Gram-positive, high G + C content, coryneform-actinomycete bacteria. Southern-blot analysis showed that Cxc contains only one copy of the ribosomal RNA-encoding genes (rRNA). A clone containing the rRNA genes was isolated from(More)
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