Improved method for measuring counting times with the Norelco x-ray diffraction spectrometer
C. L. Christ
1951, Conference Paper, Analytical Chemistry
[No abstract available]...
Fluorometric determination of zirconium in minerals
W.C. Alford, L. Shapiro, C. E. White
1951, Analytical Chemistry (23) 1149-1152
The increasing use of zirconium in alloys and in the ceramics industry has created renewed interest in methods for its determination. It is a common constituent of many minerals, but is usually present in very small amounts. Published methods tend to be tedious, time-consuming, and uncertain as to accuracy. A...
Vegetation of Southwestern watersheds in the nineteenth century
Luna Bergere Leopold
1951, Geographical Review (41) 295-316
The recollections of many old-timers who tell of grass “stirrup high” have given rise to the idea that vegetation in the Southwest was uniformly better in the middle of the last century than it is at present. The change is usually attributed to overgrazing, which timed if it did not...
Aromatic fluorine compounds. IV. 1,2,3,5-Tetrafluorobenzene
G. C. Finger, F.H. Reed, R.E. Oesterling
1951, Journal of the American Chemical Society (73) 152-153
The preparation of 1,2,3,5-tetrafluorobenzene and some of its intermediates is described. Cuprous oxide as a catalyst was used to advantage in the hypophosphorous acid deamination method....
Movement and dispersion of a blocked spawning run of sea lampreys in the Great Lakes
Vernon C. Applegate, Bernard R. Smith
1951, Transactions of the North American Wildlife Conference (16) 243-251
Abstract has not been submitted...
Decline of the lake trout fishery in Lake Michigan
Ralph Hile, Paul H. Eschmeyer, George F. Lunger
1951, Fishery Bulletin of the U.S. Fish and Wildlife Service (52) 77-95
No abstract available....
Determination of fluorine in organic compounds: Microcombustion method
H. S. Clark
1951, Analytical Chemistry (23) 659-661
A reliable and widely applicable means of determining fluorine in organic compounds has long been needed. Increased interest in this field of research in recent years has intensified the need. Fluorine in organic combinations may be determined by combustion at 900° C. in a quartz tube with a platinum catalyst,...
Status of the lake trout fishery in Lake Superior
Ralph Hile, Paul H. Eschmeyer, George F. Lunger
1951, The Fisherman (19) 5, 13
Abstract has not been submitted...
The sea lamprey in the Great Lakes
Vernon C. Applegate
1951, Scientific Monthly (72) 275-281
Abstract has not been submitted...
Decline of the trout fishery in Lake Michigan
Ralph Hile, Paul H. Eschmeyer, George F. Lunger
1951, The Fisherman (19) 5, 10
Abstract has not been submitted...
Bottom fauna and temperature conditions in relation to trout management in St. Mary's River, Augusta County, Virginia
E. W. Surber
1951, Virginia Journal of Science (2) 190-202
Determination of lithium in rocks: Fluorometric method
C. E. White, M. H. Fletcher, J. Parks
1951, Analytical Chemistry (23) 478-481
The gravimetric method in general use for the determination of lithium is tedious, and the final weighed product often contains other alkali metals. A fluorometric method was developed to shorten the time required for the analysis and to assure that the final determination is for lithium alone. This procedure is...
Recent advances in fluorine chemistry
G. C. Finger
1951, Journal of Chemical Education (28) 49-52
No abstract available....
Cocarboxylase and adenosine triphosphate as growth factors for Hemophilus piscium
P. J. Griffin
1951, Archives of Biochemistry and Biophysics (30) 100-102
Aromatic fluorine compounds. III. The fluoromesitylenes and derivatives
G. C. Finger, F.H. Reed, E.W. Maynert, A.M. Weiner
1951, Journal of the American Chemical Society (73) 149-151
Nitration of mesitylene and difluoromesitylene in anhydrous hydrofluoric acid gave near quantitative yields of dinitromesitylene and 2,4-difluoro-6-nitromesitylene, respectively. Difluoro- and trifluoromesitylene were synthesized by the Schiemann reaction in record yields reported for this type of reaction. Various intermediates and derivatives are reported for the fluoromesitylenes. Among the products of exhaustive...
Aromatic fluorine compounds. II. 1,2,4,5-Tetrafluorobenzene and related compounds
G. C. Finger, F.H. Reed, D.M. Burness, D.M. Fort, R.R. Blough
1951, Journal of the American Chemical Society (73) 145-149
The synthesis and properties of 1,2,4,5-tetrafluorobenzene and a group of bromofluoro and chlorofluorobenzenes with a predominating 1,2,4,5-structure are described. Flash point and surface tension data for the fluorinated benzenes and the influence of chlorine substitution upon these values were studied. Under nitration conditions, 1,2,4,5-tetrafluorobenzene will not form a nitro derivative,...
Aromatic fluorine compounds. V. 1,3,5-Trifluorobenzene
G. C. Finger, F.H. Reed, J.L. Finnerty
1951, Journal of the American Chemical Society (73) 153-155
The synthesis and properties of 1,3,5-trifluorobenzene, its intermediates and some of its derivatives have been described....
Determination of molybenum in soils and rocks: A geochemical semimicro field method
F. N. Ward
1951, Analytical Chemistry (23) 788-790
Reconnaissance work in geochemical prospecting requires a simple, rapid, and moderately accurate method for the determination of small amounts of molybdenum in soils and rocks. The useful range of the suggested procedure is from 1 to 32 p.p.m. of molybdenum, but the upper limit can be extended. Duplicate determinations on...
The quantitative determination of calcite associated with the carbonate-bearing apatites
Sol R. Silverman, Ruth K. Fuyat, Jeanne D. Weiser
1951, Trace Elements Investigations 118
The CO2 combined as calcite in carbonate-bearing apatites as been distinguished from that combined as carbonate-apatite, or present in some form other than calcite, by use of X-ray powder patterns, differential thermal analyses, and differential solubility tests. These methods were applied to several pure apatite minerals, to one fossil bone,...
Uranium occurrences on the Blue Jay Claim, White Signal District, Grant County, New Mexico
Harry C. Granger, Herman L. Bauer Jr.
1951, Trace Elements Memorandum 117
A discovery of secondary uranium minerals on the Blue Jay claim was reported in 1949 and the occurrence was examined by the authors in March 1950, The Blue Jay claim is about three-fourths of a mile south of White Signal, Grant County, N. Mex. in sees, 23 and 26, T....
A state‐wide program of periodic measurements of ground‐water level In Nebraska
L.K. Wenzel
1951, Eos, Transactions, American Geophysical Union (16) 495-498
The precipitation in Nebraska has been considerably less than normal in the last four years, and in consequence the ground‐water level in many parts of the State has declined to a marked extent. Moreover, in some parts of Nebraska the ground‐water level has declined as the result of land‐drainage, and in other parts it has risen as the result of irrigation with water diverted from streams. These changes in ground‐water level produced by drainage, irrigation, and decreased precipitation have caused...
Ground water in the Escalante Valley, Beaver, Iron, and Washington Counties, Utah
Philip F. Fix, W.B. Nelson, B. E. Lofgren, R.G. Butler
1950, Technical Publication 6
Escalante Valley in southwestern Utah is one of the largest and most important ground-water areas of the State, with 1,300 square miles of arid land and an additional 1,500 square miles in its tributary drainage basin. Ground water is obtained from gravel and sand beds in the unconsolidated valley fill....
Subsurface reconnaissance of glacial deposits in northeastern Kansas
J.C. Frye, K.L. Walters
1950, Kansas Geological Survey Bulletin (86) 141-158
Pollution in the lower Columbia Basin in 1948 with particular reference to the Willamette River
F. F. Fish, R.R. Rucker
1950, Special Scientific Report - Fisheries 30
Development of the salmon resources of the lower Columbia River Basin appears as sound insurance against the threat of a serious reduction in the runs to the upper river areas through the multiple-purpose programs of water development now under way by the Corps of Engineers, the Bureau of Reclamation, and...
Geology and ground-water resources of Rice County, Kansas:
O. S. Fent
1950, Kansas Geological Survey Bulletin (85)