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Page 5663, results 141551 - 141575

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The EROS Data Center
Water Resources Division, U.S. Geological Survey
1972, Report
The EROS Data Center in Sioux Falls, South Dakota, is operated for the Earth Resources Observation Systems Program of the Department of the Interior by the Topographic Division of the Geological Survey to provide access to Earth Resources Technology Satellite (ERTS) imagery, USGS aerial photography, and NASA aircraft data for...
Acoustic-reflection profiles, eastern Greater Antilles: Leg 3, 1971 cruise, UNITEDGEO I
Louis E. Garrison
1972, Report
IntroductionAs part of a cooperative marine research program designated the Internataional Decade of Ocean Exploration (IDOE), the United states Geological Survey is participating in an investigation of the geologic framework and resource potential of continental margins and small ocean basins in the Gulf of Mexico, Caribbean Sea, and west African...
Acoustic-reflection profiles, Bay of Campeche: International Decade of Ocean Exploration, U.S. Geological Survey, Leg 1, 1971 cruise, UNITEDGEO I
George William Moore
1972, Report
IntroductionAs part of a cooperative marine research program designated the International Decade of Ocean Exploration (IDOE), the United States Geological Survey is participating in an investigation of the geologic framework and resource potential of continental margins and small ocean basins in the Gulf of Mexico, Caribbean Sea, and west African...
Fish rhabdoviruses: Morphology and ultrastructure of North American salmonid isolates
R. W. Darlington, R. Trafford, K. Wolf
1972, Archiv Fur Die Gesamte Virusforschung (39) 257-264
The morphology and ultrastructure of three North American salmonid pathogens, Oregon sockeye salmon, chinook salmon and infectious hematopoietic necrosis viruses, were examined by thin sectioning and negative staining after growth in fathead minnow cells at 10 ° C. The viruses matured at the plasma membrane of these cells. They were...
Seasonal population characteristics of the opossum shrimp, Mysis relicta, in southeastern Lake Michigan, 1970-71
James B. Reynolds, G.M. DeGraeve
1972, Proceedings of the 15th Conference on Great Lakes Research (15) 117-131
This study of depth distribution, abundance, growth, reproduction and standing crop of the opossum shrimp, Mysis relicta, in southeastern Lake Michigan was based on monthly samples collected from August 1970 through July 1971 (except February and March). Population density was usually low at 10-20 fathoms, moderate at 25-30 fathoms and...
Life history and production of walleyes of the 1959 year-class in western Lake Erie, 1959-62
John W. Parsons
1972, Transactions of the American Fisheries Society (101) 655-661
Because of the near collapse of the fishery for walleyes (Stizostedion vitreum vitreum) in Lake Erie in the late 1950's, walleyes of the 1959 year-class were studied to gain a better understanding of the life history of the species and the dynamics of the population. In the summer of 1959...
Limnology and fish ecology of sockeye salmon nursery lakes of the world
Wilbur L. Hartman, R.L. Burgner
1972, Journal of the Fisheries Research Board of Canada (29) 699-715
Many important, recently glaciated oligotrophic lakes that lie in coastal regions around the northern rim of the Pacific Ocean produce anadromous populations of sockeye salmon, Oncorhynchus nerka. This paper describes the limnology and fish ecology of two such lakes in British Columbia, five in Alaska, and one in Kamchatka. Then...
Studies on the control of whirling disease (Myxosoma cerebralis)
G.L. Hoffman Sr., G.L. Hoffman Jr.
1972, Journal of Wildlife Diseases (8) 49-53
Based on presumptive evidence of death (extrusion of polar filaments and disintegration of sporoplasm) 1.0%, 0.5%, and 0.25% calcium oxide or potassium hydroxide killed the spores of Myxosoma cerebrallis in vitro. Chlorine at 400 ppm destroyed 36% to 90% of the spores but 13% to 37% of those in the controls...
Absolute stress measurements at the rangely anticline, Northwestern Colorado
R. V. de la Cruz, C.B. Raleigh
1972, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (9) 625-634
Five different methods of measuring absolute state of stress in rocks in situ were used at sites near Rangely, Colorado, and the results compared. For near-surface measurements, overcoring of the borehole-deformation gage is the most convenient and rapid means of obtaining reliable values for the...
Annual summary of water quality data for selected sites in the Pacific Northwest, October 1971 to September 1972
U.S. Geological Survey Northwest Water Resources Data Center
1972, Report
Water resources data collected in the Pacific Northwest during the 1972 water year include chemical and physical characteristics of surface water. Data included in this report were collected by the Water Resources Division of the U.S. Geological Survey under the direction of the following district chiefs: H.K. Hall, Idaho; George...
Martian physical properties experiments: The Viking Mars Lander
R.W. Shorthill, R.E. Hutton, H. J. Moore, R.F. Scott
1972, Icarus (16) 217-222
Current data indicate that Mars, like the Earth and Moon, will have a soil-like layer. An understanding of this soil-like layer is an essential ingredient in understanding the Martian ecology.The Viking Lander and its subsystems will be used in a manner similar to that used by Sue Surveyor program to...
Site distribution of iron in staurolite
Eric Dowty
1972, Earth and Planetary Science Letters (15) 72-74
The Mössbauer spectrum of staurolite does not necessarily indicate that ferrous iron is distributed over both the tetrahedral Fe site and one or more of the octahedral sites, as previously thought. Two doublets are present in the spectrum, but their quadrupole spliting...
Location and description of spiral-shaped microorganisms in the normal rat cecum
Charles P. Davis, D. Mulcahy, A. Takeuchi, D.C. Savage
1972, Infection and Immunity (6) 184-192
Some indigenous microorganisms have been shown to localize in certain anatomical sites of the digestive tract of mammals. We studied the ceca of normal adult rats by light and electron microscopy to determine whether any specific bacterial population localizes in this area. All rats studied showed...
Exposure times necessary for antimycin and rotenone to eliminate certain freshwater fish
P.A. Gilderhus
1972, Journal of the Fisheries Research Board of Canada (29) 199-202
In laboratory flowing-water troughs exposure required to induce 100% mortality, regardless of time to death for antimycin and rotenone against selected freshwater fish species was determined. Carp and white suckers required shorter exposures to antimycin (6 hr) than to rotenone (18–24 hr) at field-use concentrations of 5 and 50 ppb respectively. Bullheads were...