Ecological Studies of the Hudson River Near Indian Point

Ecological Studies of the Hudson River Near Indian Point

Date: April 1971
Creator: New York University. Medical Center. Institute of Environmental Medicine.
Description: "The general purpose of [this study is] to determine the ecological responses of the [Hudson] River to various classes of potential pollutants, so that the discharge of waste heat and radionuclides from the Indian Point Power Plant can be evaluated in context with these" (p. 1).
Contributing Partner: UNT Libraries
Effects of methanol, atrazine, and copper on the ultrastructure of Pseudokirchneriella subcapitata (Selenastrum capricornutum).

Effects of methanol, atrazine, and copper on the ultrastructure of Pseudokirchneriella subcapitata (Selenastrum capricornutum).

Date: May 2004
Creator: Garrett, David C.
Description: The toxicity of methanol, atrazine, and copper to Pseudokirchneriella subcapitata (Korshikov) Hindák historically referred to as Selenastrum capricornutum Printz were determined following 96 hrs growth in a modified Goram's growth media. Methanol and atrazine inhibited fluorescence readings in the cultures by 50% (IC50) at concentrations of 2% and 82 µg/l respectively. These toxicity values compared favorably to other published reports. The IC50 for copper was 160 µg/l which is substantially higher than reported values. This is understandable because of the high chelating capacity of Goram's media. The use of stereologically derived relative volume in the chloroplasts, mitochondria, lipid bodies, phosphate bodies, and nucleus was investigated to determine if it could be used as a sensitive endpoint in toxicity tests. The volume fractions for the chloroplasts and mitochondria were normally distributed in control cells while the nuclei, phosphate bodies, and lipid bodies were not. The chloroplasts were the most dominate organelle occupying a mean relative volume of 46% and mitochondria occupied a mean relative volume of 3%. The nucleus and phosphate bodies occupied a median relative volume of 7% and 2% respectively. The lipid bodies were rare in section profile and no meaningful median relative volume could be calculated. Up to ...
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Harmful Algal Blooms in US Waters

Harmful Algal Blooms in US Waters

Date: October 2000
Creator: National Science and Technology Council (U.S.). Committee on Environment and Natural Resources.
Description: This document discusses the causes of harmful algae blooms and their impact on the environment, public health, and the economy. The document also discusses options for managing algal blooms and current federal efforts to address the problem.
Contributing Partner: UNT Libraries
Integrated Assessment of Hypoxia in the Northern Gulf of Mexico

Integrated Assessment of Hypoxia in the Northern Gulf of Mexico

Date: May 2000
Creator: National Science and Technology Council (U.S.). Committee on Environment and Natural Resources.
Description: This document details the ecological and economic effects of low oxygen (hypoxic) conditions in the Gulf of Mexico. This condition is caused by deforestation, river channelization, and the overuse of nitrogen in agricultural fertilizer. This document summarizes scientific evidence for the causes of hypoxia, the negative impact on Gulf of Mexico fisheries, and long-term national strategies for managing and mitigating the problem.
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The Physical, Chemical, and Biological Factors Contributing to Algae Blooms in Fresh-Water Reservoirs

The Physical, Chemical, and Biological Factors Contributing to Algae Blooms in Fresh-Water Reservoirs

Date: 1949
Creator: Redden, David R.
Description: The purpose of this investigation is to attempt to relate the distribution and periodicity of the plankton to the variations in the biological, chemical, and physical factors.
Contributing Partner: UNT Libraries
A Screening of Fungi for Metabolites Inhibitory to the Growth of Bloom-Forming Blue-Green Algae

A Screening of Fungi for Metabolites Inhibitory to the Growth of Bloom-Forming Blue-Green Algae

Date: December 1970
Creator: Hardcastle, Ronald V.
Description: Since many approaches to dealing with algal blooms are inefficient, expensive, or harmful, it was concluded that a biologically-synthesized chemical agent, specifically inhibitory to pre-bloom algal cells, might prove helpful in controlling algal blooms. Fungi were chosen as the biological entities to investigate for such a chemical.
Contributing Partner: UNT Libraries
Evaluation of the Chlorophyll/Fluorescence Sensor of the YSI Multiprobe: Comparison to an Acetone Extraction Procedure

Evaluation of the Chlorophyll/Fluorescence Sensor of the YSI Multiprobe: Comparison to an Acetone Extraction Procedure

Date: May 2001
Creator: Lambert, Patricia
Description: The purpose of this study was to examine the suitability of the YSI model 6600 Environmental Monitoring System (multiprobe) for long term deployment at a site in Lewisville Lake, Texas. Specifically, agreement between a laboratory extraction procedure and the multiprobe chlorophyll/fluorescence readings was examined. Preliminary studies involved determining the best method for disrupting algal cells prior to analysis and examining the precision and linearity of the acetone extraction procedure. Cell disruption by mortar and pestle grinding was preferable to bath sonication. Comparison of the chlorophyll/fluorescence readings from the multiprobe and the extraction procedure indicated that they were significantly correlated but temperature dependent.
Contributing Partner: UNT Libraries
The Effect of Geosmin on the Growth of Bacillus cereus

The Effect of Geosmin on the Growth of Bacillus cereus

Date: August 1972
Creator: Barnes, Randall D.
Description: The purpose of this study was to determine the effect of varying concentrations of geosmin on the growth of Bacillus cereus.
Contributing Partner: UNT Libraries
An Investigation of Algae and Common Tastes and Odors in Fresh Water

An Investigation of Algae and Common Tastes and Odors in Fresh Water

Date: 1956
Creator: Harmon, John C.
Description: The purpose of this investigation was to isolate and grow algae common to the southwest in unialgal culture; to either sustain or grow one of the principal bloom-causing organisms, with emphasis on Microcystis aeruginosa; to isolate and culture actinomycetes from the same waters from which the algae were obtained; and to inoculate these algae with actinomycetes and determine their effects through development and deterioration.
Contributing Partner: UNT Libraries
Transport of Viable Dissemules of Algae and Protozoa by Selected Diptera

Transport of Viable Dissemules of Algae and Protozoa by Selected Diptera

Date: August 1966
Creator: Revill, Donald L.
Description: This research was designed primarily to determine whether and to what extent several species of Dipteria (true flies) carry viable dissemules of algae and or Protozoa "in-flight."
Contributing Partner: UNT Libraries
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