8,201 research outputs found
HB 1789, Relating to Environmental Protection in Transportation - House Committees on Transportation, Energy and Environmental Protection, Joint Public Hearing - February 11, 1993, 8:30 am, Room 1008, SOT
SR 104/SCR 118, Relating to Act 77 - Statement for Senate Committees on Agriculture; Tourism, Recreation and Planning - March 29, 1990
The determination of the critical sizes in table concentration
It has been observed in table concentration that the ore band consists of the coarest sic particles of ore on the bottom or low side. Further up on this ore band the coarse particles grade into finer particles, until a certain marked degree of fineness is reached by which the mineral can no longer adhere to the table top, but must be carried over by the wash water as slimes. To determine the critical size of ore of practical value which will remain in the concentrates band, under certain variable conditions, is the purport of this thesis --Object of Experiment, page 1
HB 1815, Making an Appropriation for an Environmental Assessment Database - Statement for Senate Committee on Agriculture and Environmental Protection, Public Hearing - March 19, 1991
Governor's Message No. 143, Gary Gill, Gubernatorial Nominee as the Director of Environmental Quality Control, Senate Committee on Executive and Judicial Appointments, Public Hearing - March 28, 1995, 5:30 P.M., Room 504, SOT
SB 307, Relating to Environmental Impact Statements - Statement for Senate Committee on Culture, Arts, and Historic Preservation, Public Hearing - February 7, 1991
Workshops on the Environmental Impact Statement Review Process and Techniques For Insular Environmental Management
SR 43, SCR 46, Urging the Federal Energy Regulatory Commission to Aggressively Incorporate Water Laws and Management Concerns of the Western States and Island Governments in its Decisions and Urging Congress to Clarify the Federal Power Act to Require Fulfillment of the Water Laws of the Western States and Island Governments - Statement for Senate Committee on Energy and Natural Resources - February 26, 1990
Differential Survival of Non-O157 Shiga Toxigenic Escherichia coli in Simulated Cattle Feedlot Runoff
Environmental survival time is important when evaluating adverse health outcomes from foodborne pathogens. Although outbreaks associated with manure-impacted irrigation or runoff water are relatively infrequent, their broad scope, regulatory importance, and severe health outcomes highlight the need to better understand the environmental survival of manure-borne pathogens. Shiga toxigenic Escherichia coli (STEC) are excreted in feces and persist in the environment until they die or recolonize a new host. Surface waters contaminated with manure-borne STEC can infect humans through drinking and recreational water use or irrigated crops that are minimally cooked. In this study, manure-impacted water microcosms mimicking beef cattle feedlot runoff were used to assess survival of STEC strains representing seven STEC serotypes (O26, O45, O103, O111, O121, O145, and O157) and persistence of target O antigen genes. Microcosms were sampled over the course of 1 year, and the entire experiment was repeated in a second year. Culture and polymerase chain reaction (PCR)- based techniques were used for detection and enumeration. Serotype-specific survival results were observed. Both STEC O26 and O45 declined slowly and remained culturable at 24 months. In contrast, STEC O121 and O145 decreased rapidly (-0.84 and -1.99 log10 abundance per month, respectively) and were unculturable by months 4 and 5, but detectable by PCR for a mean of 4.5 and 8.3 months, respectively. STEC O103, O111, and O157 remained culturable for a mean of 11.6, 5.5, and 15 months and detectable by PCR for a mean of 12, 13.8, and 18.6 months after inoculation, respectively. Results document that some STEC serotypes have the biological potential to survive in manure-impacted waters for extended periods of time when competing microflora are eliminated. Serotype-specific differences in survival of target bacteria and persistence of target genes were observed in this sample set, with STEC O26 and O45 strains appearing the most robust in these microcosm studies
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