Seed predation due to the yucca moth symbiosis
Jon E. Keeley, Sterling C. Keeley, C. C. Swift, J. Lee
1984, American Midland Naturalist (112) 187-191
All species of Yucca (Agavaceae) require the pollinator services of a species of moth in the genus Tegeticula (Lepidoptera: Incurvariidae). These moths oviposit in the ovary of the plants and the larvae are entirely dependent upon Yucca seeds for food. The extent and distribution of larval seed predation was examined...
Multilocus electrophoretic assessment of the genetic structure and diversity of Yersinia ruckeri
W. B. Schill, S.R. Phelps, S. W. Pyle
1984, Applied and Environmental Microbiology (48) 975-979
Multilocus isoenzyme electrophoresis was used to screen 47 field isolates of Yersinia ruckeri for electrophoretic variation at 15 enzyme loci. Only four electrophoretic types were observed, thus indicating that the genetic structure of Y. ruckeri is clonal. Forty-two isolates were of one electrophoretic type, a reflection of the low amount of genetic diversity extant...
Molybdenum and copper levels in white-tailed deer near uranium mines in Texas
Kirk A. King, John LeLeux, Bernard M. Mulhern
1984, Journal of Wildlife Management (48) 267-270
No abstract available. ...
A lymphosarcoma of thymic origin in the rainbow trout, Salmo gairdneri Richardson
G.W. Warr, B.R. Griffin, D. P. Anderson, P. E. McAllister, B. Lidgerding, C. E. Smith
1984, Journal of Fish Diseases (7) 73-82
A rainbow trout with a malignant lymphoma of probable thymic origin showed direct spread of the tumour to the gills, metastases to the liver and head kidney, and the presence of abnormal circulating lymphocytes. The cells of the tumour possessed plasma membrane immunoglobulin detectable by...
U. S. GEOLOGICAL SURVEY'S RESEARCH PROGRAM IN THE NEWLY PROCLAIMED EXCLUSIVE ECONOMIC ZONE.
Gary Hill
1984, Conference Paper, Technical Papers of the American Congress of Surveying and Mapping
The U. S. Geological Survey (USGS) has been developing a program which would emphasize broad-scale surveys of the continental margin and intensive studies of 'baseline corridors' in various areas of the U. S. EEZ to gather energy and mining information in this new frontier as quickly as possible. Of twelve...
Analytical results and sample localities of rock, stream sediment and oxalic-acid-soluble fraction of stream-sediment samples from the Ten Lakes Wilderness Study Area, Lincoln County, Montana
R. W. Leinz, D. F. Siems, B. F. Arbogast, C. M. McDougal
1984, Open-File Report 86-429
No abstract available....
Isotope composition of sulphate in acid mine drainage as measure of bacterial oxidation
B.E. Taylor, M.C. Wheeler, D. Kirk Nordstrom
1984, Nature (308) 538-541
The formation of acid waters by oxidation of pyrite-bearing ore deposits, mine tailing piles, and coal measures is a complex biogeochemical process and is a serious environmental problem. We have studied the oxygen and sulphur isotope geochemistry of sulphides, sulphur, sulphate and water in the field and in experiments to...
Modeling behavior of prescribed fires in Yosemite National Park
J. W. van Wagtendonk, S.J. Botti
1984, Journal of Forestry (82) 479-484
The National Fire Danger Rating System and the Fire Behavior Prediction System were tested on prescribed fires burning underneath canopies in six fuel types in Yosemite National Park, California. The mean error for rate of spread was +0.03 foot per minute for the NFDRS and -0.15 foot for the...
Reproduction and survival of the desert tortoise (Scaptochelys agassizii) in Ivanpah Valley, California
F.B. Turner, P.A. Medica, C.L. Lyons
1984, Copeia (1984) 811-820
No abstract available....
ORIGIN OF QUARTZ IN COAL.
Leslie F. Ruppert, C. Blaine Cecil, Ronald W. Stanton
1984, Conference Paper, ACS Division of Fuel Chemistry, Preprints
Both a scanning electron microscope and an electron microprobe (EMP) were used in this study to analyze the cathodoluminescence properties of quartz grains in samples of the Upper Freeport coal bed because quartz grains in coal are small (silt sized) and below the resolution capabilities of a standard luminoscope. Quartz...
Proton and metal ion binding to natural organic polyelectrolytes—II. Preliminary investigation with a peat and a humic acid
J.A. Marinsky, M.M. Reddy
1984, Organic Geochemistry (7) 215-221
We summarize here experimental studies of proton and metal ion binding to a peat and a humic acid. Data analysis is based on a unified physico-chemical model for reaction of simple ions with polyelectrolytes employing a modified Henderson-Hasselbalch equation. Peat exhibited an apparent intrinsic acid dissociation constant of 10−4.05, and...
Accelerator radiocarbon dating of evidence for prehistoric horticulture in Illinois
N. Conard, D.L. Asch, N.B. Asch, D. Elmore, H. Gove, M. Rubin, J.A. Brown, M.D. Wiant, K.B. Farnsworth, T.G. Cook
1984, Nature (308) 443-446
With the development of direct detection radiocarbon dating, which uses an accelerator as part of a highly selective mass spectrometer, it is now possible to determine the age of milligram samples of organic materials1-5. One application of accelerator dating is in evaluating scanty, sometimes controversial evidence for early horticulture throughout...
Elk and deer diets in old-growth forests in western Washington
David M. Leslie Jr., Edward E. Starkey, Martin Vavra
1984, Journal of Wildlife Management (48) 762-775
Dietary quality and overlap of sympatric Roosevelt elk (Cervus elaphus roosevelti) and Columbian black-tailed deer (Odocoileus hemionus columbianus) were investigated in old-growth forests of the Hoh Valley, Olympic National Park, Washington. Diets of both cervids were comprised mainly of common old-growth flora, particularly in winter. High dietary overlap suggested competitive...
The Piedmont landscape of Maryland: a new look at an old problem.
J. E. Costa, E.T. Cleaves
1984, Earth Surface Processes and Landforms (9) 59-74
Both equilibrium and episodic erosion features can be recognized in the modern landscape. An equilibrium condition is suggested by adjustment of first and second order streams to rock structure and lithology, entrenchment of some streams against gneiss domes, altitudinal zonation of rock types around gneiss domes, correlation of lithology with...
A Model of Regional Ground-Water Flow in Secondary-Permeability Terrane
J. M. Gerhart
1984, Groundwater (22) 168-175
The ground-water flow system in the Lower Susquehanna River Basin in Pennsylvania and Maryland can be considered as one complex unconfined aquifer in which secondary porosity and permeability are the dominant influences on the occurrence and flow of ground water. The degree of development of...
Applied cartographic communication: map symbolization for atlases.
J. L. Morrison
1984, Cartographica: The International Journal for Geographic Information and Geovisualization (21) 44-84
A detailed investigation of the symbolization used on general-purpose atlas reference maps. It indicates how theories of cartographic communication can be put into practice. Two major points emerge. First, that a logical scheme can be constructed from existing cartographic research and applied to an analysis of the choice of symbolization...
Landslides caused by earthquakes
D. K. Keefer
1984, Geological Society of America Bulletin (95) 406-421
Data from 40 historical world-wide earthquakes were studied to determine the characteristics, geologic environments, and hazards of landslides caused by seismic events. This sample of 40 events was supplemented with intensity data from several hundred United States earthquakes to study relations between landslide...
Thermal conductivity determinations on solid rock - a comparison between a steady-state divided-bar apparatus and a commercial transient line-source device
J.H. Sass, C. Stone, R. J. Munroe
1984, Journal of Volcanology and Geothermal Research (20) 145-153
Two apparatuses were used to measure thermal conductivities on pairs of contiguous samples from 17 specimens of solid rock: the USGS divided-bar apparatus, a steadystate comparative method, and the Shotherm "Quick Thermal Meter" (QTM), which employs a transient strip heat source. Both devices were calibrated relative to fused silica. Both...
Sedimentary structures formed in sand by surface tension on melting hailstones
D. M. Rubin, R. E. Hunter
1984, Journal of Sedimentary Petrology (54) 581-582
Craters form when hailstones impact sand. When a hailstone melts, wet but unsaturated sand within the crater is attracted to the hailstone surface by surface tension. Shrinkage of the melting hailstone then produces one or more rings of sand within the impact crater.--Modified...
Potential flow through channel constriction.
J. K. Lee
1984, Journal of Hydraulic Engineering (110) 515-520
Potential flow through an eccentric, normal constriction of zero thickness in an infinitely long, straight channel of constant width and unit depth is studied by use of a Schwarz-Christoffel transformation. The transformation is integrated by a direct approach. Parametric equations for streamlines are obtained and used to compute an average...
Holocene age of the Yuha burial: Direct radiocarbon determinations by accelerator mass spectrometry
Thomas W. Stafford Jr., A.J.T. Jull, T.H. Zabel, D.J. Donahue, R.C. Duhamel, K. Brendel, C.V. Haynes Jr., J. L. Bischoff, L.A. Payen, R.E. Taylor
1984, Nature (308) 446-447
The view that human populations may not have arrived in the Western Hemisphere before about 12,000 radiocarbon yr BP1,2 has been challenged by claims of much greater antiquity for a small number of archaeological sites and human skeleton samples. One such site is the Homo sapiens sapiens cairn burial excavated...
The heat capacities of osumilite from 298.15 to 1000 K, the thermodynamic properties of two natural chlorites to 500 K, and the thermodynamic properties of petalite to 1800 K.
B. S. Hemingway, R. A. Robie, J.A. Kittrick, E.S. Grew, J.A. Nelen, D. London
1984, American Mineralogist (69) 701-710
Modifications to an automated low-T, adiabatic calorimeter are described. Thermodynamic data obtained with this instrument are reported for minerals from metamorphic terrains. (U.S. Bureau of Mines Report of Investigations 8451)-J.A.Z....
Olokele rock avalanche, island of Kauai, Hawaii
B.L. Jones, S.S.W. Chinn, J.C. Brice
1984, Geology (12) 209-211
In October 1981 a mass of rock and soil having an estimated volume of 500,000 m3 fell as a rock fall-avalanche from a steep slope 800 m high near the head of Olokele Canyon on the island of Kauai, Hawaii. Boulders were launched into...
User guide for the USGS aerial camera Report of Calibration.
W.P. Tayman
1984, Photogrammetric Engineering and Remote Sensing (50) 577-584
Calibration and testing of aerial mapping cameras includes the measurement of optical constants and the check for proper functioning of a number of complicated mechanical and electrical parts. For this purpose the US Geological Survey performs an operational type photographic calibration. This paper is not strictly a scientific paper but...
Fission-track dating applied to mineral exploration
C. W. Naeser
1984, Nuclear Tracks and Radiation Measurements (1982) (10) 422
The partial to total resetting of fission-track ages of minerals in country rock near a mineralized area can be used to (1) locate a thermal anomaly, and (2) date the mineralizing event. Two mining districts in Colorado have been studied - Rico and Gilman. Rico is a precious- and base-metal...
