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184904 results.

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Page 4264, results 106576 - 106600

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Discordant 14C ages from buried tidal-marsh soils in the Cascadia subduction zone, southern Oregon coast
A.R. Nelson
1992, Quaternary Research (38) 74-90
Peaty, tidal-marsh soils interbedded with estuarine mud in late Holocene stratigraphic sequences near Coos Bay, Oregon, may have been submerged and buried during great (M > 8) subduction earthquakes, smaller localized earthquakes, or by nontectonic processes. Radiocarbon dating might help distinguish among these alternatives by showing that soils at different...
Sensitivity of ground - water recharge estimates to climate variability and change, Columbia Plateau, Washington
John J. Vaccaro
1992, Journal of Geophysical Research D: Atmospheres (97) 2821-2833
The sensitivity of groundwater recharge estimates was investigated for the semiarid Ellensburg basin, located on the Columbia Plateau, Washington, to historic and projected climatic regimes. Recharge was estimated for predevelopment and current (1980s) land use conditions using a daily energy-soil-water balance model. A synthetic daily weather generator was used to...
A hydrogen-oxidizing, Fe(III)-reducing microorganism from the Great Bay estuary, New Hampshire
F. Caccavo Jr., R.P. Blakemore, Derek R. Lovley
1992, Applied and Environmental Microbiology (58) 3211-3216
A dissimilatory Fe(III)- and Mn(IV)-reducing bacterium was isolated from bottom sediments of the Great Bay estuary, New Hampshire. The isolate was a facultatively anaerobic gram-negative rod which did not appear to fit into any previously described genus. It was temporarily designated strain BrY. BrY grew anaerobically in a defined medium...
Debris flow rheology: Experimental analysis of fine-grained slurries
Jon J. Major, Thomas C. Pierson
1992, Water Resources Research (28) 841-857
The rheology of slurries consisting of ≤2-mm sediment from a natural debris flow deposit was measured using a wide-gap concentric-cylinder viscometer. The influence of sediment concentration and size and distribution of grains on the bulk rheological behavior of the slurries was evaluated at concentrations ranging from 0.44 to 0.66. The...
Landsat thematic mapper products for rangeland assessment
Robert H. Haas
1992, Geocarto International (7) 27-33
Landsat Thematic Mapper (TM) data are useful for mapping rangeland resources worldwide. Spatial resolution and spectral characteristics of the data are adequate for performing a variety of range‐related tasks, including monitoring ecological change. The unique spectral characteristics of TM data are important in the development of products for manual interpretation...
Evaluation of methyl fluoride and dimethyl ether as inhibitors of aerobic methane oxidation
Ronald S. Oremland, Charles W. Culbertson
1992, Applied and Environmental Microbiology (58) 2983-2992
Methyl fluoride (MF) and dimethyl ether (DME) were effective inhibitors of aerobic methanotrophy in a variety of soils. MF and DME blocked consumption of CH4 as well as the oxidation of 14CH4 to 14CO2, but neither MF nor DME affected the oxidation of [14C]methanol or [14C]formate to 14CO2. Cooxidation of ethane and propane by methane-oxidizing...
A technique for the reduction of banding in Landsat Thematic Mapper Images
Dennis L. Helder, Bruce K. Quirk, Joy J. Hood
1992, Photogrammetric Engineering and Remote Sensing (58) 1425-1431
The radiometric difference between forward and reverse scans in Landsat thematic mapper (TM) images, referred to as "banding," can create problems when enhancing the image for interpretation or when performing quantitative studies. Recent research has led to the development of a method that reduces the banding in Landsat TM data...
Prevalence of Renibacterium salmoninarum among downstream-migrating salmonids in the Columbia River
J. E. Sanders, J.J Long, C.K. Arakawa, J. L. Bartholomew, J. S. Rohovec
1992, Journal of Aquatic Animal Health (4) 72-75
Bacterial kidney disease (BKD) is an important contributor to mortality of salmonids in hatcheries in the Columbia River basin. However, the impact of BKD on the survival of downstream migrants is difficult to determine because there is little information on the disease-related mortality among these fish. In this study, the...
Multiple tube sampler for benthic and pelagic invertebrates in shallow wetlands
N.H. Euliss Jr., G.A. Swanson, J. MacKay
1992, Journal of Wildlife Management (56) 186-191
Sampling devices that minimize bias and function in aquatic habitats used by waterfowl are needed. We devised a multiple tube sampling device for quantitative sampling of small (< 3 cm) aquatic invertebrates in wetlands. The sampler reduced bias associated with sampling macroinvertebrates that utilize the benthic-pelagic interface because it simultaneously...
Brucellosis: a political disease
B. Smith, T.J. Roffe
1992, Bugle (9) 71-80
With the challenges confronting North America's elk herds today, a bacteria that causes a nonfatal disease in a few elk herds seems an unlikely addition to the list. Fragmentation of habitat, dwindling bull-cow ratios, grazing competition from livestock on public rangelands, or the crowding of favorite hunting spots all seem...
Tuberculosis: Will it infect wild elk?
T.J. Roffe, B. Smith
1992, Bugle (9) 86-92
Tuberculosis! Just the name conjures up images of a devastating, chronic, debilitating disease. And so it is in both humans and animals. Tuberculosis (TB) is not known to be present to any significant degree in the free-ranging elk herds of North America. But increasing reports of TB in deer species-including...
The timing of wing molt in tundra swans: energetic and non-energetic constraints
S.L. Earnst
1992, Condor (94) 847-856
Date of wing molt initiation, based on the regression of tenth primary length on capture date, was calculated for breeding and nonbreeding Tundra Swans (Cygnus columbianus columbianus) on the Colville River Delta, Alaska. Breeding females initiated wing molt significantly later than breeding males and nonbreeding males and females; the molt...
Suppression of guinea pig ileum induced contractility by plasma albumin of hibernators
David S. Bruce, Douglas L. Ambler, Timothy M. Henschel, Peter R. Oeltgen, Sita P. Nilekani, Steven C. Amstrup
1992, Pharmacology Biochemistry and Behavior (43) 199-203
Previous studies suggest that hibernation may be regulated by internal opioids and that the putative “hibernation induction trigger” (HIT) may itself be an opioid. This study examined the effect of plasma albumin (known to bind HIT) on induced contractility of the guinea pig ileum muscle strip. Morphine (400 nM) depressed...