John T. Lisle, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 38
Microbiology and public beach safety: integrated science for the protection of public health Microbiology and public beach safety: integrated science for the protection of public health
No abstract available.
Authors
Christine A. Kellogg, John T. Lisle
Perennial Antarctic lake ice: a refuge for cyanobacteria in an extreme environment Perennial Antarctic lake ice: a refuge for cyanobacteria in an extreme environment
No abstract available
Authors
J.C. Priscu, E.E. Adams, H.W. Paerl, C.H. Fritsen, J.E. Dore, J.T. Lisle, C.F. Wolf, Jill A. Mikucki
Comparison of fluorescence microscopy and solid-phase cytometry methods for counting bacteria in water Comparison of fluorescence microscopy and solid-phase cytometry methods for counting bacteria in water
Total direct counts of bacterial abundance are central in assessing the biomass and bacteriological quality of water in ecological and industrial applications. Several factors have been identified that contribute to the variability in bacterial abundance counts when using fluorescent microscopy, the most significant of which is retaining an adequate number of cells per filter to ensure...
Authors
John T. Lisle, Martin A. Hamilton, Alan R. Willse, Gordon A. McFeters
The occurrence of lysogenic bacteria and microbial aggregates in the lakes of the McMurdo Dry Valleys, Antarctica The occurrence of lysogenic bacteria and microbial aggregates in the lakes of the McMurdo Dry Valleys, Antarctica
The McMurdo Dry Valleys of Antarctica form the coldest and driest ecosystem on Earth. Within this region there are a number of perennially ice-covered (3–6 m thick) lakes that support active microbial assemblages and have a paucity of metazoans. These lakes receive limited allochthonous input of carbon and nutrients, and primary productivity is limited to only 6 months per year owing to...
Authors
J.T. Lisle, J.C. Priscu
Occurrence of microbial indicators and Clostridium perfringens in wastewater, water column samples, sediments, drinking water, and Weddell seal feces collected at McMurdo Station, Antarctica Occurrence of microbial indicators and Clostridium perfringens in wastewater, water column samples, sediments, drinking water, and Weddell seal feces collected at McMurdo Station, Antarctica
McMurdo Station, Antarctica, has discharged untreated sewage into McMurdo Sound for decades. Previous studies delineated the impacted area, which included the drinking water intake, by using total coliform and Clostridium perfringens concentrations. The estimation of risk to humans in contact with the impacted and potable waters may be greater than presumed, as these microbial indicators...
Authors
J.T. Lisle, J.J. Smith, D.D. Edwards, G.A. McFeters
Supraglacial sulfur springs and associated biological activity in the Canadian high arctic - signs of life beneath the ice Supraglacial sulfur springs and associated biological activity in the Canadian high arctic - signs of life beneath the ice
Unique springs, discharging from the surface of an arctic glacier, release H2S and deposit native sulfur, gypsum, and calcite. The presence of sulfur in three oxidation states indicates a complex series of redox reactions. Physical and chemical conditions of the spring water and surrounding environment, as well as mineralogical and isotopic signatures, suggest biologically mediated...
Authors
Stephen E. Grasby, Carlton C. Allen, Teresa G. Longazo, John T. Lisle, Dale W. Griffin, Benoit Beauchamp
Science and Products
Filter Total Items: 38
Microbiology and public beach safety: integrated science for the protection of public health Microbiology and public beach safety: integrated science for the protection of public health
No abstract available.
Authors
Christine A. Kellogg, John T. Lisle
Perennial Antarctic lake ice: a refuge for cyanobacteria in an extreme environment Perennial Antarctic lake ice: a refuge for cyanobacteria in an extreme environment
No abstract available
Authors
J.C. Priscu, E.E. Adams, H.W. Paerl, C.H. Fritsen, J.E. Dore, J.T. Lisle, C.F. Wolf, Jill A. Mikucki
Comparison of fluorescence microscopy and solid-phase cytometry methods for counting bacteria in water Comparison of fluorescence microscopy and solid-phase cytometry methods for counting bacteria in water
Total direct counts of bacterial abundance are central in assessing the biomass and bacteriological quality of water in ecological and industrial applications. Several factors have been identified that contribute to the variability in bacterial abundance counts when using fluorescent microscopy, the most significant of which is retaining an adequate number of cells per filter to ensure...
Authors
John T. Lisle, Martin A. Hamilton, Alan R. Willse, Gordon A. McFeters
The occurrence of lysogenic bacteria and microbial aggregates in the lakes of the McMurdo Dry Valleys, Antarctica The occurrence of lysogenic bacteria and microbial aggregates in the lakes of the McMurdo Dry Valleys, Antarctica
The McMurdo Dry Valleys of Antarctica form the coldest and driest ecosystem on Earth. Within this region there are a number of perennially ice-covered (3–6 m thick) lakes that support active microbial assemblages and have a paucity of metazoans. These lakes receive limited allochthonous input of carbon and nutrients, and primary productivity is limited to only 6 months per year owing to...
Authors
J.T. Lisle, J.C. Priscu
Occurrence of microbial indicators and Clostridium perfringens in wastewater, water column samples, sediments, drinking water, and Weddell seal feces collected at McMurdo Station, Antarctica Occurrence of microbial indicators and Clostridium perfringens in wastewater, water column samples, sediments, drinking water, and Weddell seal feces collected at McMurdo Station, Antarctica
McMurdo Station, Antarctica, has discharged untreated sewage into McMurdo Sound for decades. Previous studies delineated the impacted area, which included the drinking water intake, by using total coliform and Clostridium perfringens concentrations. The estimation of risk to humans in contact with the impacted and potable waters may be greater than presumed, as these microbial indicators...
Authors
J.T. Lisle, J.J. Smith, D.D. Edwards, G.A. McFeters
Supraglacial sulfur springs and associated biological activity in the Canadian high arctic - signs of life beneath the ice Supraglacial sulfur springs and associated biological activity in the Canadian high arctic - signs of life beneath the ice
Unique springs, discharging from the surface of an arctic glacier, release H2S and deposit native sulfur, gypsum, and calcite. The presence of sulfur in three oxidation states indicates a complex series of redox reactions. Physical and chemical conditions of the spring water and surrounding environment, as well as mineralogical and isotopic signatures, suggest biologically mediated...
Authors
Stephen E. Grasby, Carlton C. Allen, Teresa G. Longazo, John T. Lisle, Dale W. Griffin, Benoit Beauchamp
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government