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Articles 4231 - 4260 of 4342

Full-Text Articles in Life Sciences

A Study Of The Effects Of Different Substrates On Growth And Reproduction In Certain Coprophilic Agaricaceae, Raymond C. Brown Dec 1960

A Study Of The Effects Of Different Substrates On Growth And Reproduction In Certain Coprophilic Agaricaceae, Raymond C. Brown

Theses and Dissertations

Psilocybe mutans sp. nov. had ceased fruiting consistently in artificial culture several years prior to the initiation of this study. In the couse of this study fruiting bodies were produced on a number of different substrates. All cultures were inoculated by mycelial transfer or by spraying with a suspension of pre-germinated spores. All cultrues were incubated for one to two weeks in a constant-temperature room at 70°F. on a shelf fourteen inches below a fluorescent lighting fixture. Lighting was continuous with an intensity at shelf level of approximately 3,000 foot-candles. Fruiting on any particular substrate was improved if the substrate …

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Observations On The Hibernation Of Culex Tarsalis Coquillett In Utah Valley, Utah, Dennis W. Trent Sep 1960

Observations On The Hibernation Of Culex Tarsalis Coquillett In Utah Valley, Utah, Dennis W. Trent

Theses and Dissertations

Culex tarsalis Coquillett is a common evening pest mosquito throughout the summer in most of temperate Western North America. Present evidence indicates this mosquito as the principal naturally infected vector of western equine encephalomyeltic (WEE) viruses. Certain interrelationships of WEE epidemiology and tarsalis bionomics are basically understood; however, in areas where winters are severe little is know of tarsalis hibernation, and the survival mechanism for WEE viruses in unknown. The purpose of this study, conducted from 1 September 1959 to 20 May 1960, was to gather ecological information on the hibernation of Culex tarsalis in Utah Valley, and secondly to …

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A Comparison Of The Root Systems Of Bitterbrush And Cliffrose, Morris G. Cline Sep 1960

A Comparison Of The Root Systems Of Bitterbrush And Cliffrose, Morris G. Cline

Theses and Dissertations

A root study was undertaken to learn about bitterbrush (Purshia tridentata (Pursh) DC) and cliffrose (Cowania stansburiana torr.) to gain some clues, perhaps, as to the causes of their present distribution. In a period extending from July 1959 to July 1960, twenty-four plants were excavated on six different sites in the Wasatch foothill belt in Utah County, Utah. Root and some soil characteristics were analyzed, described and compared.

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Tingidae: New Genera, Species, Homonyms, And Synonyms (Hemiptera), Carl J. Drake, Florence A. Ruhoff Aug 1960

Tingidae: New Genera, Species, Homonyms, And Synonyms (Hemiptera), Carl J. Drake, Florence A. Ruhoff

Great Basin Naturalist

No abstract provided.

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A Comparative Study Of Crotaphytus Holbrook (Iguanidae), Wilbur Gerald Robinson Aug 1960

A Comparative Study Of Crotaphytus Holbrook (Iguanidae), Wilbur Gerald Robinson

Theses and Dissertations

The anterior myology of Crotaphytus wislizeni and C. collaris is described in detail and a statistical analysis is made of the differences in the relative bone sizes, and the number of eggs per clutch, as well as other taxonomic characters previously applied to these species. The significant differences found with respect to the shape of the skull, that of the body, and the character of the hyoid are correlated with muscular development and habits of the two species. The descriptive material is accompanied by detailed myological and osteological illustrations of C. wislizeni. Comparative notes are made on C. reticulatus which …

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Lichens Of The Wasatch Mountains In Central Utah, Harry Stewart Nielsen Jr. Aug 1960

Lichens Of The Wasatch Mountains In Central Utah, Harry Stewart Nielsen Jr.

Theses and Dissertations

The purpose of this study is to conduct an intensive investigation of the lichen flora of the Wasatch Mountains in central Utah. The approach followed is that of compiling into one account keys, descriptions, illustrations and ecological notes of lichens that are found in this region of the state.

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The Vitamin B1-Sparing Action Of Sorbitol, Gisela Eleanor Bethsold Jun 1960

The Vitamin B1-Sparing Action Of Sorbitol, Gisela Eleanor Bethsold

Theses and Dissertations

The present study was initiated to determine the effect sorbitol has upon the enzymatic functions of thiamin; specifically, what effect sorbitol bas upon the alpha-ketoglutarate and pyruvate dehydrogenases activities of rat liver mitochondria. In addition, the effect of varying the dietary sorbitol concentration on the development of an athiaminosis was studied, particularly the effect on growth rate.

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The Aquatic Plants Of Central Utah And Their Distribution, Gerald E. Bessey May 1960

The Aquatic Plants Of Central Utah And Their Distribution, Gerald E. Bessey

Theses and Dissertations

It was the purpose of this study to determine what aquatic plants were common to central Utah and to outline the ecological factors that control their distribution. The main emphasis throughout has been upon the more macroscopic aquatic plants. Such algae were included as was warranted by their size,, abundance and importance in the various habitats in which they grew. As this study progressed it became evident that there was a need for a broad survey-type study of the aquatic plants that would include essentially all of the wet lands of the central Utah region. The area of study closely …

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Ticks Of The Genus Ixodes In Utah, Dorald M. Allred, D Elden Beck, Leland D. White Jan 1960

Ticks Of The Genus Ixodes In Utah, Dorald M. Allred, D Elden Beck, Leland D. White

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

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Front Matter, Vol. 1 No. 4 Jan 1960

Front Matter, Vol. 1 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

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End Matter, Vol. 1 No. 4 Jan 1960

End Matter, Vol. 1 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

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Life History Of The Desert Wood Rat, Robert Carr Stones Jan 1960

Life History Of The Desert Wood Rat, Robert Carr Stones

Theses and Dissertations

A life history field study of the widespread desert wood rat, Neotoma lepida lepida Thomas, was conducted periodically from August, 1959, to June, 1960, eight miles west of Jericho, Juab County, Utah. An estimation of the density of houses and population density of wood rats throughout the general region, accomplished by charted guadrats and a plotless quarter method, revealed an average densityof 4.9 houses of 3.1 adult wood rats per acre in a juniper-sagebrush community of the type frequently found throughout the area. Live-trapping within a well-wooded juniper-sagebrush community (twenty-four acre area) revealed twenty-seven wood rats captured sixty-eight times for …

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Vegetational Changes In A Shadscale-Winterfat Plant Association During Twenty-Three Years Of Controlled Grazing, Kimball T. Harper Aug 1959

Vegetational Changes In A Shadscale-Winterfat Plant Association During Twenty-Three Years Of Controlled Grazing, Kimball T. Harper

Theses and Dissertations

This paper will report the results of a study commenced in 1935, at the Desert Experimental Range, Pine Valley, Millard County, Utah, to determine the relative effects of various grazing treatments upon the plant members of the shadscale [Atriplex confertifolia (Torr. And Frem.) S. Wats.] - winterfat [Eurotia lanata (Pursh) Moq.] plant association. Results of this study indicate that distinct vegetational changes have occurred within that plant association during twenty-three years of controlled grazing by sheep.

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Studies On The Biological Oxidation Of Ferrous Iron And Chalcopyrite, Loral Alvin Decker Aug 1959

Studies On The Biological Oxidation Of Ferrous Iron And Chalcopyrite, Loral Alvin Decker

Theses and Dissertations

The purpose of this investigation was to determine the effectiveness of the leaching streams from waste copper ore dumps as a nutrient solution for subsequent biological oxidation and solubilization of sulfide minerals. The copper in the leaching streams is precipitated by displacement with iron. As a result of this procedure the solution is high in ferrous iron concentration and has a pH of near 3.7. The bacteria in the leaching streams are capable of oxidizing ferrous iron to the ferric state and sulfide minerals to sulfates. The effects of temperatures, pH, urea, and aeration rate on the oxidation of the …

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Bionomics Of Culex Tarsalis Coquillett In Utah County, Stanley K. Taylor Jul 1959

Bionomics Of Culex Tarsalis Coquillett In Utah County, Stanley K. Taylor

Theses and Dissertations

This paper presents information concerning the bionomics of Culex tarsalis Coquillett in Utah County. Observations indicate that rock piles and talus slides are typical hibernation sites. The spring emergence from hibernation occurred between 28 March and 7 April 1959. Larvae breed in a great variety of habitats, including street-gutters, animal tracks, marshes and waste water from irrigation systems. The peak population density for both larvae and adults occurred during the first week in August. Charts, graphs, drawings and photographs are used in the presentation of data.

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Identification Of Larval Ticks Of The Genus Ixodes Known To Occur In Utah, Leland D. White Jul 1959

Identification Of Larval Ticks Of The Genus Ixodes Known To Occur In Utah, Leland D. White

Theses and Dissertations

The purpose of this study is to present an analysis and key to the larvae of the nine species of Ixodes known to occur in Utah. These are I. kingi, I. muris, I. texanus, I. pacificus, I. spinipalpis, I. marmotae, I. ochotonoe, I angustus, and I. sculptus. Larvae from the first five of these nine species used in this study were reared in the laboratory by worked cited in the secion on Analysis of Species. those of the remaining four were identified on the basis of their presence with identifiable numphal and adult forms. Host specificity, although certainly variable with …

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A Morphological Study Of The External Female Genitalia And Spermatheca Of Some Calendra, De Mar H. Curtis May 1959

A Morphological Study Of The External Female Genitalia And Spermatheca Of Some Calendra, De Mar H. Curtis

Theses and Dissertations

The genus Calendra is the largest genus of the sub-family Rhynchophorine. There have been 116 species described from the United States and Mexico. At the present time only 71 are recognized as valid species. About 50 of the 71 species occur in the United States and Canada.

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End Matter, Vol. 1 No. 3 Dec 1958

End Matter, Vol. 1 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

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Zoology Of The Upper Colorado River Basin: 1. The Biotic Communities, C. Lynn Hayward, D Elden Beck, Wilmer W. Tanner Dec 1958

Zoology Of The Upper Colorado River Basin: 1. The Biotic Communities, C. Lynn Hayward, D Elden Beck, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

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Front Matter, Vol. 1 No. 3 Dec 1958

Front Matter, Vol. 1 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

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Food Habits Of The Uinta Ground Squirrel (Citellus Armatus Kennicott) On Some Meadows Of Mt. Timpanogos, Utah, Robert K. Shaw Aug 1958

Food Habits Of The Uinta Ground Squirrel (Citellus Armatus Kennicott) On Some Meadows Of Mt. Timpanogos, Utah, Robert K. Shaw

Theses and Dissertations

Food habits of the Uinta ground squirrel were investigated on some open meadows on the south-east slope of Mt. Timpanogos. Special emphasis was placed on species of plants eaten; and preference of plants in relation to season, succulence, and phenology. Other investigations were made in reference to: parts of plants eaten, non-plant material eaten, daily and seasonal activities in relation to foraging, feeding procedures, and the relationship between plant cover and Uinta ground squirrel activity.

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Bird Populations Of The Wasatch Foothills, Delwyn G. Berett Aug 1958

Bird Populations Of The Wasatch Foothills, Delwyn G. Berett

Theses and Dissertations

One of the more interesting and unique of the natural habitats in the state of Utah is its chaparral zone, extending along the western foothills of the Wasatch Range. The purpose of this study has been to make an analysis of the bird population of this region in order to determine the comparative abundance of the species, their seasonal distribution within the area, and their ecological preferences.

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Genetic Variation In Bluebunch Wheatgrass, Max P. Dunford Aug 1958

Genetic Variation In Bluebunch Wheatgrass, Max P. Dunford

Theses and Dissertations

Agropyron spicatum (Pursh) Scribn, and Smith, an important forage grass distributed primarily throughout western United States and northward into Canada, exhibits considerable ecological, cytological, and genetic variation. Twenty-five populations of 100 plants each were scored to obtain data on morphological and ecological variation. Statistical analysis of the data from fourteen of the populations showed that correlations between awn divergence and length, rhizomes with number of culms, adn diameter with number of culms were inconsistent or not significant. However, the correltion between rhizomes and diameter was significant in all populations.

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The Comparative Mineral Requirements Of Pioneer And Climax Range Grasses, Paul L. Steele Aug 1958

The Comparative Mineral Requirements Of Pioneer And Climax Range Grasses, Paul L. Steele

Theses and Dissertations

A study was made to determine the effects of variable levels of nitrogen, phosphorus, and potassium upon several species of pioneer and climax range grasses, and to determine if these grasses differ in their ability to grow when supplied with low levels of these nutrients. Five grasses were used. The climax grasses were Agropyron spicatum and Agropryon smithii, and the pioneer grasses were Aristida longiseta, Sporobous cryptandrus, and Oryzopsis hymenoides.

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The External Morphology Of Pseudopanurgus Aethiops (Cresson), Glenn A. Hackwell Jul 1958

The External Morphology Of Pseudopanurgus Aethiops (Cresson), Glenn A. Hackwell

Theses and Dissertations

In comparing the head of Pseudopanurgus with Anthophora and Apis, the general outline appears rather similar, the most significant variation being found on the posterior surface. Extending ventrally from the postoccipital suture to the dorsal wall of the proboscidial fossa is a suture known as the fused hypostomal suture. The hypostomal area is rather small and makes up only a small portion of the dorsal and lateral walls of the proboscidial fossa, the remainder being formed by the postgena. If this is correct, the hypostomal carinae (a term with which the author does not agree) are actually located on the …

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A Morphological Study Of The Subtribe Ithypori (Coleoptera: Curculionidae), Leslie J. Boothe Jul 1958

A Morphological Study Of The Subtribe Ithypori (Coleoptera: Curculionidae), Leslie J. Boothe

Theses and Dissertations

This is a morphological study of the subtrib!a Itb:ypori, undertaken to discover all that we can about the morphology and if possible justify the present classification. It includes four genera and fifteen identified species.

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A Study Of Physoderma On Three Species Of Portulacaceae, David L. Mumford Jun 1958

A Study Of Physoderma On Three Species Of Portulacaceae, David L. Mumford

Theses and Dissertations

Three species of the Portulacaceae each infected by a Physoderma parasite were collected at several locations in Utah. The hosts have been identified as Claytonia lanceolata Pursh., Oreobroma pygmaeum (A. Gray) Howell, and Erocallis triphylla (S. Wats.) Rydb. Since our present knowledge of Physoderma on members of the Portulacaceae is meager, it seemed desirable to learn as much as possible about the parasite, its hosts, and the relationship between parasite and host. Plants of all three hosts activated from perennating organs were grown for extended periods of time under uniform conditions. Cold treatments were most successful in activating host perennating …

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A Study Of Three Photochemical Activities Of Chloroplasts, Jimmy W. Hinkson Apr 1958

A Study Of Three Photochemical Activities Of Chloroplasts, Jimmy W. Hinkson

Theses and Dissertations

Chloroplasts of sugar beet leaves were subjected to treatment by heating, by incubation at pH 8.5 and pH 5.5, by incubation in ion low water, by sonic oscillation, by digestion with enzymes (lysozyme, pancreatin, and lipase), by extraction with digitonin, and by chemical compounds including 8-hydroxy-quinoline, sodium azide, zinc sulfate, phenyl mercuric acetate, potassium cyanide, 1-allylthiourea, 2,4-dinitrophenol, thymol, and p-chloromercuribenzoate. A comparative study was made of the effects of these treatments upon three photochemical reactions (the photoreduction of 2,6- dichlorophenol indophenol, the photoreduction of indigo carmine in the presence of a couple composed of 2,6-dichlorophenol indophenol and ascorbic acid, and …

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End Matter, Vol. 1 No. 2 Jan 1958

End Matter, Vol. 1 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

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Front Matter, Vol. 1 No. 2 Jan 1958

Front Matter, Vol. 1 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

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