Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Results

165598 results.

Alternate formats: RIS file of the first 3000 search results  |  Download all results as CSV | TSV | Excel  |  RSS feed based on this search  |  JSON version of this page of results

Page 6165, results 154101 - 154125

Show results on a map

Publication Extents

Not all publications have extents, not all extents are completely accurate
Quartz helix magnetic susceptibility balance using the Curie-Cheneveau principle
F. E. Senftle, M. D. Lee, A. A. Monkewicz, J. W. Mayo, T. Pankey
1958, Review of Scientific Instruments (29) 429-432
A quartz spring balance is described which can be used to measure the magnetic susceptibility of submilligram amounts of sample. The magnetic field is supplied by a moving permanent magnet, and the susceptibility is determined by the deflection of the spring observed in a measuring microscope. The apparatus is calibrated by a comparison standard (platinum) and results are shown for platinum, nickel aluminate, lead, manganese, and sucrose. A precision of better...
Volumes and surface areas of pendular rings
W. Rose
1958, Journal of Applied Physics (29) 687-691
A packing of spheres is taken as a suitable model of porous media. The packing may be regular and the sphere size may be uniform, but in general, both should be random. Approximations are developed to give the volumes and surface areas of pendular rings that exist at points of sphere...
Role of clay minerals in the transportation of iron
D. Carroll
1958, Geochimica et Cosmochimica Acta (14) 1-28
The clay minerals have iron associated with them in several ways:1.(1) as an essential constituent2.(2) as a minor constituent within the crystal lattice where it is in isomorphous substitution and3.(3) as iron oxide on the surface of the mineral platelets. Nontronite, “hydromica,” some...
Biogeochemistry of the rare-earth elements with particular reference to hickory trees
W. O. Robinson, H. Bastron, K. J. Murata
1958, Geochimica et Cosmochimica Acta (14) 55-67
Hickory trees concentrate the rare-earth elements in their leaves to a phenomenal degree and may contain as much as 2300 p.p.m. of total rare earths based on the dry weight of the leaves. The average proportions of the individual elements (atomic percent of the total rare-earth elements) in the leaves...
Potassium bromide method of infrared sampling
R.G. Milkey
1958, Analytical Chemistry (30) 1931-1933
In the preparation of potassium bromide pressed windows for use in the infrared analysis of solids, severe grinding of the potassium bromide powder may produce strong absorption bands that could interfere seriously with the spectra of the sample. These absorption bands appear to be due to some crystal alteration of...
The deuterium content of water in some volcanic glasses
I. Friedman, R. L. Smith
1958, Geochimica et Cosmochimica Acta (15) 218-228
The deuterium-hydrogen composition (relative to Lake Michigan water = 0.0) of water extractsd from coexisting perlite and obsidian from eleven different localities was determined. The water content of the obsidians is generally from 0.09 to 0.29 per cent by weight, though two samples from near Olancha, California, contain about 0.92...
Dithizone method for determination of lead in monazite
R. A. Powell, C. A. Kinser
1958, Analytical Chemistry (30) 1139-1141
In the determination of lead in monazite-to be used as the basis for geologic age measurements-it was necessary to eliminate interferences due to the presence of phosphates of thorium and the rare earth metals. The method involves attacking the monazite samples with hot, concentrated sulfuric acid, then taking them up...
Determination of the oxidation state of uranium in apatite and phosphorite deposits
R. S. Clarke Jr., Z. S. Altschuler
1958, Geochimica et Cosmochimica Acta (13) 127-142
Geological and mineralogical evidence indicate that the uranium present in apatite may proxy for calcium in the mineral structure as U(IV). An experimental investigation was conducted and chemical evidence was obtained that establishes the presence of U(IV) in apatite.The following analytical procedure was developed for the determination of U(IV). Carbonatefluorapatite...
Relationship between Secchi disc readings and light penetration in Lake Huron
Alfred M. Beeton
1958, Transactions of the American Fisheries Society (87) 73-79
Fifty-seven paired photometer and Secchi disc measurements made at 18 stations in Saginaw Bay and Lake Huron support the view that a counter-clockwise current usually occurs in the Bay with more transparent Lake Huron water flowing in along the northwest shore and less transparent Bay water flowing out along the...
Fishery management problems and possibilities on large southeastern reservoirs
John W. Parsons
1958, Transactions of the American Fisheries Society (87) 333-355
Principal problems concerning the fisheries of large reservoirs in the Southeast are: inefficient and highly selective exploitation of fish stocks, and protection and reclamation of damaged or threatened fisheries in tailwaters and tributary streams. Seven mainstream reservoirs on which data are available support an average angling pressure of 4.9 trips...
Suggestions for reduction of natural mortality in fish populations
S. F. Snieszko
1958, Transactions of the American Fisheries Society (87) 380-385
Illness, in fish as well as in other animals, when caused by an infectious disease, is often not the result of infection with pathogens alone. In many cases the pathogens and hosts can exist side by side without development of disease symptoms. Such symptoms, with resulting illness or death,...
Some myxosporidia found in Pacific Northwest salmonids
W. T. Yasutake, E. M. Wood
1957, Journal of Parasitology (43) 633-642
During the histological examination of a group of wild and hatchery salmonids undescribed sporazoans were frequently observed. This was not unexpected, since Myxosporidia are typical fish parasites (Kudo, 1920). Myxidium were observed in kidney tubules, Cholromyxum in glomeruli, and Myxobous in the spinal cord and on epidermal scales. The present...
New host and locality record for Triaenophorus crassus forel (Cestoda: pseudophyllidea)
J. R. Uzmann, M. N. Hesselholt
1957, Journal of Parasitology (43) 205-208
The adult form of Triaenophorus crassus Forel, 1868 (= T. robustus Olsson, 1893; = T. tricuspidatus morpha megadentatus Wardle, 1932) occurs as an intestinal parasite in the pike, Esox lucius L., a holarctic species of wide distribution. Preliminary life-history stages include procercoid development in copepods of the genus Cyclops followed...
Teratological hermaphroditism in the chum salmon Oncorhynchus keta (Walbaum)
J. R. Uzmann, M. N. Hesselholt
1957, Progressive Fish-Culturist (20) 191-192
The anomalous condition of hermaphroditism appears to be no less rare in fish than in other normally dioecious animals. Previous records of bisexuality' in the Pacific salmons, Oncorhynchus spp., are few in number despite the intensive study accorded this group. Rutter (1902) reported the condition in two king salmon (O....
The nutrition of salmonid fishes. I. Chemical and histological studies of wild and domestic fish
E. M. Wood, W. T. Yasutake, A.N. Woodall, J.E. Halver
1957, Journal of Nutrition (61) 465-478
Salmonids reared under artificial conditions show marked consistent differences in body composition in comparison with wild salmonids. Protein and mineral levels are lower and lipid values are higher in hatchery fish than in wild fish. As the period of artificial rearing is increased, these differences become more extreme....
The nutrition of salmonid fishes. II. Studies on production diets
E. M. Wood, W. T. Yasutake, A.N. Woodall, J.E. Halver
1957, Journal of Nutrition (61) 479-488
In 69 production diets fed to hatchery salmonids, there was a wide variation in the ingredients of the diets and in their content of protein, fat, carbohydrate and ash. There was a close correlation between the body composition of hatchery-raised fish and the composition of the diets fed....
Histopathology of fish. V. Gill disease
1957, Progressive Fish-Culturist (19) 7-13
Possibly no single disease accounts for greater annual mortality than gill disease. Apparently endemic in many hatcheries, the disease is characterized by periodic sharp upsurges which are sometimes correlated with rising water temperatures, excessive foreign matter in the water (Wales and Evins 1937), or borderline nutritional conditions....