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Page 6879, results 171951 - 171975

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Determination of thorium in the parts per million range in rocks
H. Levine, F. S. Grimaldi
1958, Geochimica et Cosmochimica Acta (14) 93-97
A procedure is presented for the determination of thorium in the concentration range of 0·2 to 10 parts per million ThO2 in felsic or mafic rocks. Thorium is extracted by mesityl oxide and purified by iodate precipitation from nitric acid medium containing tartaric acid and hydrogen peroxide. The thorium is determined...
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...
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...
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...
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...
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....
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...
Some problems of private trout hatchery operators
Robert R. Rucker
1957, Transactions of the American Fisheries Society (87) 374-379
Disease, nutritional, and environmental problems in commercial production of trout are discussed, including mortality and age of spawners, copepod and gyrodactylid infections, suitable water temperatures, diseases (especially red mouth and back peel) and inspection of fish. It is concluded that experiences with hatchery procedures have varied greatly and often the...
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....
Acute sulfamethazine toxicity in young salmon
E. M. Wood, W. T. Yasutake, Harlan E. Johnson
1957, Progressive Fish-Culturist (19) 64-67
Adverse effects from the medication of fish diseases with sulfonamides have been reported by several workers. A decreased growth rate (Gutsell and Snieszko 1949, Snieszko and Wood 1955), the production of drug resistant strains of pathogens (Snieszko 1952), sterility and kidney damage (Wood et al., 1955), and mortalities (Johnson and...
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....
Reconnaissance of beryl-bearing pegmatites in the Ruby Mountains, other areas in Nevada, and northwestern Mohave County, Arizona
Jerry Chipman Olson, E. Neal Hinrichs
1957, Trace Elements Investigations 655
Pegmatite occurs widely in Nevada and northwestern Arizona, but little mining has been done for such pegmatite minerals as mica, feldspar, beryl, and lepidolite.  Reconnaissance for beryl-bearing pegmatite in Nevada and in part of Mohave County, Ariz., and detailed studies in the Dawley Canyon area, Elko County, Nev., have shown...
Measuring streamflow under ice conditions
A.M. Moore
1957, Journal of the Hydraulics Division (83) 1162-1-1162-12
Effects of ice formation on stage discharge relations; occurrence and effect of surface, frazil, and anchor ice is described and recorder graphs registering these effects are shown; one investigation of siphon action is detailed; factors affecting accuracy of ice-affected records....