Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16734
A detailed taxonomy of Upper Cretaceous and lower Tertiary Crassatellidae in the eastern United States: An example of the nature of extinction at the boundary A detailed taxonomy of Upper Cretaceous and lower Tertiary Crassatellidae in the eastern United States: An example of the nature of extinction at the boundary
Current theories on the causes of extinction at the Cretaceous-Tertiary boundary have been based on previously published data; however, few workers have stopped to ask the question, 'How good is the basic data set?' To test the accuracy of the published record, a quantitative and qualitative analysis of the Crassatellidae (Mollusca, Bivalvia) of the Gulf and Mid-Atlantic Coastal Plains...
Authors
G. Lynn Wingard
Altitude and configuration of the potentiometric surface in Springfield Township, Bucks County, Pennsylvania, April 1991 through October 1991 Altitude and configuration of the potentiometric surface in Springfield Township, Bucks County, Pennsylvania, April 1991 through October 1991
No abstract available
Authors
Curtis L. Schreffler
Elemental composition of a migratory and a land-locked strain of Atlantic salmon Salmo salar Elemental composition of a migratory and a land-locked strain of Atlantic salmon Salmo salar
1. The growth and elemental composition of an anadromous strain and a land-locked strain of Atlantic salmon (Salmo salar) were compared. 2. All fish were raised from the egg stage under identical conditions. 3. The land-locked strain was significantly higher in lipids than the anadromous strain throughout the study. 4. Results of exposure to seawater at 2-week intervals between days 431...
Authors
D. V. Rottiers
Nonspecific defence mechanisms assay in fish I; Phagocytic index, adherence and phagocytic ability of neutrophils (NBT test) and myeloperoxidase activity test Nonspecific defence mechanisms assay in fish I; Phagocytic index, adherence and phagocytic ability of neutrophils (NBT test) and myeloperoxidase activity test
No abstract available at this time
Authors
A.K. Siwicki, D. P. Anderson, J. Antychowicz
Stimulation of nonspecific defense mechanisms and the specific immune response in fish Stimulation of nonspecific defense mechanisms and the specific immune response in fish
No abstract available at this time
Authors
D. P. Anderson, A.K. Siwicki
Hematological and serological assays to determine fish health Hematological and serological assays to determine fish health
No abstract available at this time
Authors
D. P. Anderson, A.K. Siwicki
The immune system of fish The immune system of fish
No abstract available at this time
Authors
A.K. Siwicki, D. P. Anderson
Habitat use by spawning adult, egg, and larval American shad in the Delaware River Habitat use by spawning adult, egg, and larval American shad in the Delaware River
No abstract available.
Authors
R. M. Ross, R. M. Bennett, T. W. H. Backman
Comparison of dilution counts with standard culture methods for the detection of Aeromonas salmonicida from clinical specimens Comparison of dilution counts with standard culture methods for the detection of Aeromonas salmonicida from clinical specimens
No abstract available.
Authors
R. C. Cipriano, L.A. Ford
Effects of repetitive formalin treatments on channel catfish juveniles Effects of repetitive formalin treatments on channel catfish juveniles
Channel catfish Icialurus punctatus ranging from 70 to 148 mm in total length were treated with formalin at a concentration of 25 μL/L for 4 h daily on four successive days each week over a 28-week period beginning in mid-September. Coefficients of condition (weight-tolength ratios) and histological examinations of gill tissues were used to evaluate health of fish exposed to formalin...
Authors
L.R. Bodensteiner, R.J. Sheenan, W.M. Lewis, P.S. Wills, R. Herman
Geologic assessments and characterization of marine sand resources - Gulf of Mexico region Geologic assessments and characterization of marine sand resources - Gulf of Mexico region
The U.S. Geological Survey conducts geologic surveys and research in marine areas of the United States and its territories and possessions. An objective in some of the investigations is locating and evaluating marine sand and gravel resources and interpretation of the origins of the sand body deposits. Results from such studies over the past 30 years show that many extremely large...
Authors
S. Jeffress Williams, Helana A. Cichon