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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Geology and hydrogeology of the Florida Keys
This chapter discusses the geology and hydrogeology of the Florida Keys, and focuses on the islands formed of Pleistocene limestone. These islands, which are crossed when driving from Miami to Key West, are typically regarded as "the Florida Keys." The outstanding and fragile character of ecosystems on and around the Florida Keys has prompted State and Federal efforts to protect and preserve the r
Authors
Robert B. Halley, H. L. Vacher, Shinn
Pesticides and volatile organic compounds in shallow urban groundwater
No abstract available.
Authors
D.W. Kolpin, P. J. Squillace, J.E. Barbash, J.S. Zogorski
European Province Late Silurian brachiopods from the Ciudad Victoria area, Tamaulipas, northeastern Mexico
No abstract available.
Authors
A. J. Boucot, Robert B. Blodgett, John H. Stewart
The use of semipermeable membrane devices (SPMDs) to concentrate inducers of fish hepatic mixed function oxygenase (MFO): Chapter 12
Semipermeable membrane devices (SPMDs) are sampling and concentrating devices comprised of a thin polyethylene membrane containing a small quantity of triolein. They have previously been used to sample air, water and sediments and have concentrated fish tainting compounds from pulp mill effluents. The ability to induce mixed function oxygenases (MFOs) is a property of a variety of organic effluent
Authors
Joanne L. Parrott, Donald E. Tillitt
Detecting contaminant-induced apoptosis and necrosis in lake trout thymocytes via flow cytometry.
This chapter details the cytofluorometric techniques employed to assess levels of active (apoptosis) and passive (necrotic) cell death in untreated and contaminant-treated fish thymocytes. The thymus is believed to be a central component of hematopoiesis and immune function in teleosts (Abelli et al., 1996). Hence, chemically-elicited adverse effects to the thymus may result in immunomodulation a
Authors
Leonard I. Sweet, Dora R. Passino-Reader, Peter G. Meier, Geneva M. Omann
Distribution and mobility of molybdenum in the terrestrial environment
Molybdenum (Mo) is an essential element for many plants and animals (Newton and Otsuka, 1980). Because of its chemical properties, Mo readily provides sites for reactions and catalysis in biochemical systems (Haight and Boston, 1973). It is therefore important to understand the processes that control the distribution, speciation, and behavior of Mo in the surficial environment. These processes wil
Authors
Kathleen S. Smith, Laurie S. Balistrieri, Steven M. Smith, Ronald C. Severson
Sulfur isotope analyses using the laser microprobe
Since the first studies of sulfur isotope variations in natural materials (Thode, 1949), it has been apparent that there are large and dramatic variations of 34S/32S ratios and that sulfur isotope studies are a powerful tool for interpreting the origins of sulfur-bearing minerals. However, sulfur is such a common element in the Earth's crust (sixteenth most abundant, averaging 0.03 wt %; Mason, 19
Authors
W.C. Pat Shanks, D.E. Crowe, Craig A. Johnson
Multiresolution convariation among landsat and AVHRR vegetation indices
No abstract available.
Authors
Lee De Cola
Physical/chemical processes affecting the subsurface fate and transport of synthetic organic materials
No abstract available.
Authors
W.P. Ball, G.P. Curtis, P.V. Roberts
Deep regional resistivity structure across the Carlin Trend
The genesis of gold deposits along the Carlin trend is not fully understood. Many of the significant mineral deposits in the Carlin trend were formed during the Tertiary as a result of interrelated high-angle basin-and-range faulting, intrusive igneous activity, and hydrothermal processes (Radtke, 1985). According to Shawe (1991), the linearity of the gold deposits along the Carlin trend and the s
Authors
Brian D. Rodriguez
Obsidian hydration dating
No abstract available.
Authors
Irving Friedman, Fred W. Trembour, Richard E. Hughes