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Articles 66241 - 66270 of 72220
Full-Text Articles in Entire DC Network
New Species Of Bark Beetles (Coleoptera: Scolytidae), Mostly Mexican. Part Iv, Stephen L. Wood
New Species Of Bark Beetles (Coleoptera: Scolytidae), Mostly Mexican. Part Iv, Stephen L. Wood
Great Basin Naturalist
No abstract provided.
Index [And Table Of Contents] To Volume 17
Index [And Table Of Contents] To Volume 17
Great Basin Naturalist
No abstract provided.
Rhenium Catalysis I. Hydrogenation And Hydroformylation Using Rhenium Carbonyl Compounds ; Ii. Hydrogenation Using Catalysts Obtained From The Reduction Of Perrhenates With Metals In Aqueous Solution, Terry G. Selin
Theses and Dissertations
The purpose of this work was to investigate the catalytic activity in both hydrogenation and hydroformylation reactions of rhenium preparations which have not been previously characterized. Rhenium pentacarbonyl was prepared in good yield from rhenium heptoxide and carbon monoxide. The optimum conditions for preparation were 25 hours per gram of dry rhenium heptoxide at 250° under 3000 psig. (initial) of carbon monoxide. Rhenium chloropentacarbonyl was prepared in 62% yield from potassium chlororhenite and carbon monoxide at high temperatures and pressures. The iodopentacarbonyl was prepared in 29% yield from potassium perrhenate, methyl iodide, and carbon monoxide. The preparation of rhenium hydrocarbonyl …
The Preparation And Catalytic Properties Of Rhenium Blacks Obtained By Reduction Of Re(Vii) In Anhydrous Ammonia And Amines With Alkali Metals, David William Seegmiller
The Preparation And Catalytic Properties Of Rhenium Blacks Obtained By Reduction Of Re(Vii) In Anhydrous Ammonia And Amines With Alkali Metals, David William Seegmiller
Theses and Dissertations
The purpose of the investigation was to determine the catalytic activity of rhenium blacks obtained by reduction of rhenium salts in alkali metal-ammonia or amine systems. A review is presented on the chemical, physical and catalytic properties of rhenium, and on the rhenide ion, on the nature of the alkali metal-liquid ammonia system, and the reduction of metallic salts therein. The first reduction system studied was that obtained by dissolving sodium in liquid ammonia. The salts reduced in this system were KReO_4, Re_2O_7 and NH_4ReO_4. The reduction of KReO_4 was unsuccessful, and the heptoxide was difficult to handle. The product …
A Preliminary Investigation Of The Role Of Selenium In The Growth Of Stanleya Pinnata, Richard F. Nelson
A Preliminary Investigation Of The Role Of Selenium In The Growth Of Stanleya Pinnata, Richard F. Nelson
Theses and Dissertations
Stanleya pinnata has been identified as an indicator plant for seleniferous soils. The apparent limitation of its distribution to seleniferous soils suggests that selenium may play an essential role in this species. This study is a preliminary investigation of the role of selenium to Stanleya pinnata. When fully ripe, seeds germinated readily. Concentrations of selenium of 100 parts per million and 1000 parts per million retarded germination. Seeds germiuated in lower concentrations were not affected which was probably due to the selenium content of the seed itself, being greater than in the germinating media. Stanleya pinnata plants were grown from …
Studies On The Periodicity Of Certain Plankton Species Of Salem Lake, Gene A. Pratt
Studies On The Periodicity Of Certain Plankton Species Of Salem Lake, Gene A. Pratt
Theses and Dissertations
Plankton samples were taken periodically from one station in Salem Lake from the fall of 1955 through the winter of 1957. Other data including the pH, dissolved oxygen content, turbidity, brightness of day, temperature, and time of day were recorded at the time of each collection. The plankton samples were centrifuged and preserved in a 4% formalin solution. They were later examined microscopically, and density, percent density, and percent frequency calculations were made from them for ten selected species and for the five phyla which they represent.
Notes On A Collection Of Amphibians And Reptiles From Southern Mexico, With A Description Of A New Hyla, Wilmer W. Tanner
Notes On A Collection Of Amphibians And Reptiles From Southern Mexico, With A Description Of A New Hyla, Wilmer W. Tanner
Great Basin Naturalist
No abstract provided.
Joseph Richard Slevin (1881–1957), Vasco M. Tanner
Joseph Richard Slevin (1881–1957), Vasco M. Tanner
Great Basin Naturalist
No abstract provided.
A New Caeculus From Oregon (Acarina: Caeculidae), Harold G. Higgins, Stanley B. Mulaik
A New Caeculus From Oregon (Acarina: Caeculidae), Harold G. Higgins, Stanley B. Mulaik
Great Basin Naturalist
No abstract provided.
An Albino Swallow In Utah, D. Elmer Johnson
An Albino Swallow In Utah, D. Elmer Johnson
Great Basin Naturalist
No abstract provided.
Scolopendrid Chilopods Of The Northern Andes Region Taken On The California Academy South America Expedition Of 1954–1955, Ralph V. Chamberlin
Scolopendrid Chilopods Of The Northern Andes Region Taken On The California Academy South America Expedition Of 1954–1955, Ralph V. Chamberlin
Great Basin Naturalist
No abstract provided.
Oviposition Habits Of The Tick Dermacentor Parumapertus Neumann And Factors Influencing Egg Development, Clive D. Jorgensen
Oviposition Habits Of The Tick Dermacentor Parumapertus Neumann And Factors Influencing Egg Development, Clive D. Jorgensen
Great Basin Naturalist
No abstract provided.
New Poecilanthrax, With Notes On Described Species (Diptera: Bombylidae), D. Elmer Johnson, Lucile Maughan Johnson
New Poecilanthrax, With Notes On Described Species (Diptera: Bombylidae), D. Elmer Johnson, Lucile Maughan Johnson
Great Basin Naturalist
No abstract provided.
Chemosynthetic Microorganisms In Leaching Sulfide Minerals, A. Keith Jameson
Chemosynthetic Microorganisms In Leaching Sulfide Minerals, A. Keith Jameson
Theses and Dissertations
This investigation showed that a single bacterium was capable of sulfide oxidation in exposed ore bodies. This single bacterium was isolated and characterized. It exhibited different characteristics than any previously known organism. It was found to be a chemosynthetic autotroph. An optimum nutrient concentration was determined for pyrite oxidation. The nutrient concentration was determined for pyrite oxidation. The nutrient contains only a source of phosphate and nitrogen. Urea was found to be a better source of nitrogen than ammonium sulfate which had previously been used. The effect of various organic compounds on the oxidation of pyrite was observed. Glucose and …
The Isomer Distribution In The Sulfonation Of Iodobenzene, Joseph A. Knight
The Isomer Distribution In The Sulfonation Of Iodobenzene, Joseph A. Knight
Theses and Dissertations
Using the isotope dilution technique, the distribution of isomers was determined when iodobenzene was sulfonated with sulfur trioxide in liquid sulfur dioxide. The active isotope was S^35. Before this distribution could be established, it was necessary to prepare the pure isomers of iodobenzenesulfonic acid. These were prepared by diazotization of the corresponding aminobenzenesulfonic acids. Since o-aminobenzenesulfonic acid was not readily available, it was necessary that it be synthesized before the diazo reactions could be carried out. Considerable work has been done on the development of a method whereby the bromobenzenesulfonic acids could be synthesized and obtained in pure form. Some …
A Morphological Study Of Some North American Sitona (Coleoptera: Curculionidae), George J. Kidd
A Morphological Study Of Some North American Sitona (Coleoptera: Curculionidae), George J. Kidd
Theses and Dissertations
This study was undertaken to identify, if possible, some morphological characteristics of the U. S. Sitona species that would help simplify the classification of this difficult group. Because of extreme difficulty in obtaining positively identified specimens of all species reported, the scope was limited to eight identified species and one unidentified series. External structures studied include mouth parts, appendages, eyes, wings, and genitalia. The spermathecae were the only internal structures analyzed. Mandibular profiles were compared throughout the species represented and variations were noted. Labia and maxillae were observed but no distinctive differences were noticed. Antennae were found to be quite …
The Incidence Of Nasal Mites In Over-Wintering Red-Wing Blackbirds In The Vicinity Of Utah Lake, Utah, George M. Talley
The Incidence Of Nasal Mites In Over-Wintering Red-Wing Blackbirds In The Vicinity Of Utah Lake, Utah, George M. Talley
Theses and Dissertations
This paper reports the incidence and associations of four species of mites, Paraneonyssus icteridius, Ptilonyssus n. sp. "A", Sternostoma n. sp. "A" , and Speleognathus sp., found in the nasal cavities of the common red-wing blackbird (Agelaius phoeniceus ssp.) and Brewer's blackbird (Euphagus cyanocephalus cyanocephalus Wagler) over-wintering in the vicinity of Provo, Utah County, Utah. Three species of mites are reported for the first time from these birds, and two of these three are undescribed species.
The Embryology Of The Paradise Fish, Macropodus Opercularis Linnaeus, Lewis M. Mulkay
The Embryology Of The Paradise Fish, Macropodus Opercularis Linnaeus, Lewis M. Mulkay
Theses and Dissertations
The development of Sacropodus opercularis Linnaeus, (Perciformes: Anabantidae), is described from cleavage to five days post hatching. For the most part M. opercularis follows the pattern of typical teleostean development except as noted below: 1. The heart develops under the left eye along the anterior margin of the yolk sac. This is similar to that reported by Ingesoll (1951) for the Blue Gourami, Trichogaster trichopterus. 2. The ear develps from the head mesenchyme alongside the brain rather than from a placode. 3. The gut develops first in the posterior region then differentiates cephalad. It was also learned that: 1. No …
Oviposition Habits Of The Tick Dermacentor Parumapertus Neumann And Factors Influencing Egg Development, Clive D. Jorgensen
Oviposition Habits Of The Tick Dermacentor Parumapertus Neumann And Factors Influencing Egg Development, Clive D. Jorgensen
Theses and Dissertations
This paper includes data concerning the influence of relative humidity, temperature, and percentage of engorgement on the pre-oviposition period, oviposition period, post-oviposition period, and incubation period of the tick Dermacentor parumapertus Neumann. The influence of the percentage of engorgement on the oviposition period, oviposition rate, and egg number is considered. Data on the disposition and number of eggs in nature are discussed.
The Dehydrocyclization Of Normal Heptane To Toluene With Supported Rhenium, Platinum And Molybdenum Catalysts, Robert R. Beishline
The Dehydrocyclization Of Normal Heptane To Toluene With Supported Rhenium, Platinum And Molybdenum Catalysts, Robert R. Beishline
Theses and Dissertations
The dehydrocyclization activity of supported platinum, molybdenum and rhenium catalysts was studied by determining the toluene yield from n-heptane as a function of temperature and metal concentration in the catalyst. The support was 100 to 200 mesh alumina. Metal concentrations of 0.01% to 1.0% platinum, 0.1% to 2.0% molybdenum and 0.1% to 2.5% rhenium were studied in the temperature range from 500° to 600° C. Platinum was shown to be superior to both molybdenum and rhenium at all temperatures and metal concentrations investigated. The rhenium data were somewhat erratic, but showed rhenium to be a poor dehydrocyclization catalyst. The apparatus, …
A Taxonomic Study Of The Families Of Utah Coleoptera Excluding Rhynchophora, T. Blaine Moore
A Taxonomic Study Of The Families Of Utah Coleoptera Excluding Rhynchophora, T. Blaine Moore
Theses and Dissertations
During the years 1950-51 work was begun on a study of the Coleoptera by the author. In 1955, due to the lack of a workable set of keys to the Coleoptera of Utah, a study was undertaken to find a way to more easily classify the beetles of the state to their respective families. The collection of Brigham Young University was used as the basis for determining the families of beetles actually found in Utah. Then a thorough search of the literature was made to find positive records of Utah families not represented in that collection. It was found that …
Lotti, Die Uhrmacherin, Marie Von Ebner-Eschenbach
Lotti, Die Uhrmacherin, Marie Von Ebner-Eschenbach
Prose Fiction
Erstdruck: In: Deutsche Rundschau, Berlin, Bd. 22, 1880; erste Buchausgabe in: Neue Erzählungen, Berlin (Franz Ebhardt) 1881. : Marie von Ebner-Eschenbach: [Gesammelte Werke in drei Bänden.] [Bd. 2:] Kleine Romane,
Unsühnbar, Marie Von Ebner-Eschenbach
Unsühnbar, Marie Von Ebner-Eschenbach
Prose Fiction
Erstdruck: In: Deutsche Rundschau, Berlin, Bd. 61, 1889; erste Buchausgabe in zwei Teilen: Berlin (Gebrüder Paetel) 1890. : Marie von Ebner-Eschenbach: [Gesammelte Werke in drei Bänden.] Bd. 1:] Das Gemeindekind. Novellen, Aphorismen
History Of The Japan Mission Of The Church Of Jesus Christ Of Latter-Day Saints, 1901-1924, Murray L. Nichols
History Of The Japan Mission Of The Church Of Jesus Christ Of Latter-Day Saints, 1901-1924, Murray L. Nichols
Theses and Dissertations
The purpose of this work is of course to fulfill thesis requirements, but more important to me is a desire that those who read it may gain a greater understanding of the mission in Japan. The membership of the church seems to have shared the traditional American opinion that the Far East is of little consequence in our affairs, and have given the area little attention. Missionaries have been and still are reluctant to go there; feelings of failure have persisted because of the early experiences in Japan. However, those who have seriously given their attention to missionary labors in …
A Study Of General And Religious Personal Problems Of Tenth, Eleventh And Twelfth Grade Seminary Students, Wilson K. Andersen
A Study Of General And Religious Personal Problems Of Tenth, Eleventh And Twelfth Grade Seminary Students, Wilson K. Andersen
Theses and Dissertations
Because it seemed likely that teachers of adolescent Latter-day Saint boys and girls might benefit from an up-to-date view about what their students are personally concered, a need was felt for this particular kind of survey. A review of the related literature indicated a dearth of material in this area, particularly in connection with Latter-day Saint youth.