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Articles 4951 - 4980 of 5010
Full-Text Articles in Life Sciences
A Life History Study Of The Spurred Towhee Pipilo Erythropthalmus Montanus, Travis G. Haws
A Life History Study Of The Spurred Towhee Pipilo Erythropthalmus Montanus, Travis G. Haws
Theses and Dissertations
This paper deals with the life history and distribution of the Spurred Towhee (Pipilo erythropthalmus moutanus Swarth). Research was begun in April, 1955, and terminted in June, 1956. The preferred habitat of this bird is the mountain slopes, canyons. and streamsides covered with a shrubby type of vegetation, usually between 5,000 and 8,000 feet in elevation. Distribution of the Spurred Towhee is throughout the central Rocky Mountain region in the states of Wyoming, Utah, Colorado, Arizona, western half of New Mexico, and into northern Mexico. During the winter these birds are found concentrated in the lower valleys along the streams …
Birds Of The Brigham Young University Campus, Barid Baran Mukherjee
Birds Of The Brigham Young University Campus, Barid Baran Mukherjee
Theses and Dissertations
This paper deals with the seasonal distribution, relative abundance, and location of the different species of birds which visit or live on the Brigham Young University campus from late summer to early spring, with a brief account of their activities. The upper campus, where this investigation was carried on, covers an area of 201 acres and is situated on a bench at the foot of the Wasatch Mountains. The study was continued from July 13, 1955 to April 15, 1956. A total of 173 hours was devoted to census work and to studying the general ecology of the area. Four …
Photo-Oxidations Sensitized By Physiologically Important Substances, Ernel D. Ihnen
Photo-Oxidations Sensitized By Physiologically Important Substances, Ernel D. Ihnen
Theses and Dissertations
A study of the photo-oxidation of the 2,6-dichlorophenol indophenol-ascorbic couple was undertaken with a view to investigating the postulated mechanism of oxidation by a component of the oxygen evolving sequence operative in photosynthesis. A spectrophotometric method for the measurement of the progress of photo-oxidation was developed. Temperature and pH dependence were determined and the effect of various common inhibitors and physiological substances tested. None of the common Hill reaction inhibitors were effective in the ascorbic acid photo-oxidation in the system used. KCN and catalase as well as a few other high molecular weight proteins were able to inhibit dark auto-oxidation …
The Interrelation And Interaction Of Allenrolfea Occidentalis And Its Edaphic Environment, Blaine H. Quigley
The Interrelation And Interaction Of Allenrolfea Occidentalis And Its Edaphic Environment, Blaine H. Quigley
Theses and Dissertations
To understand more fully how Allenrolfea occidentalis (S . Wats . ) Kuntze tolerates high salt concentrations and why it grows in hummocks, this study was undertaken . Allenrolfea is a shrubby member of the Sa licorneae subfamily of the Chenopodiaceae family , with practically leafless green succulent stems and inconspicuous flowers .
Mammals Of The Lynndyl, Utah, Sand Dune Area : A Population Problem, Hugh J. Phillips
Mammals Of The Lynndyl, Utah, Sand Dune Area : A Population Problem, Hugh J. Phillips
Theses and Dissertations
The purpose of this study was to determine the kinds, population, distribution, and general habits of the mammals of the Lynndyl sand dune area. Only one article concerning the dunes was found, but several have been written on other dunes; however, none was found concerning mammals. Two quantitative studies, plot and transect trappings, were made and general observations were taken within the study area. Three types of plots; Russian thistle, juniper, and baren moving dunes; were trapped and revealed the following species: Dipodomys ordii, Peromyscus maniculatus, Reithrodontomys megalotis, Onychomys leucogaster, and Neotoma lepida. The most numerous animal in all plots …
A Study Of The Families Of Utah Hemiptera, Gerald L. Nielsen
A Study Of The Families Of Utah Hemiptera, Gerald L. Nielsen
Theses and Dissertations
This study determines the number of families of Hemiptera found in the state and has a key for their classification. The characteristics and general distributions of each family are given, along with specific examples of the most common and economically important bugs. Important references are given for each family of work done to date. It was found that there have been twenty-eight families of Hemiptera collected in Utah, some of which are well represented in numbers of genera, species, and individuals, while others are represented by a single species and collected in only one or two places in the state.
An Ecological And Distributional Study Of Small Mammals Of Cedar Valley, Utah County, Utah, Loraine Woodbury
An Ecological And Distributional Study Of Small Mammals Of Cedar Valley, Utah County, Utah, Loraine Woodbury
Theses and Dissertations
This paper deals with the ecology and distribution of small mammals in the following plant communities of Cedar Valley, Utah: juniper, greasewood, grass-rabbitbrush, and shadscale. Study periods were in August 1950 and 1951, October 1951, and April 1952 with each community studied 1,440 trap-nights. A combination of the Calhoun ''B" and transect method was employed; plant species and densities were taken and soil samples were checked for moisture content, total soluble salts and mechanical analysis. In the communities studied Dipodomys ordii utahensis (Merriam) is found in greatest abundance on sandy soil and Perognathus parvus olivaceus (Merriam) is found in greater …
Study Of The Aspectional Variations Of Siphonaptera Associated With The Nests Of The Thomas Wood Rat Neotoma Lepida Lepida Thomas, J. Franklin Howell
Study Of The Aspectional Variations Of Siphonaptera Associated With The Nests Of The Thomas Wood Rat Neotoma Lepida Lepida Thomas, J. Franklin Howell
Theses and Dissertations
Much work has been done concerning those parasites found upon the host. Very little has been done concerning those parasites that are parasitic but are very rarely found upon the host. Therefore, the purpose of this study is to determine seasonal distribution of those fleas found in the nests of the desert wood rat (N. l. lepida). This paper shows that there is a seasonal variation of flea populations within a certain geographic area. It also shows that certain species of fleas are distributed seasonally; not all species being present in the same season. Three of the eleven species collected …
Distinguishing Characteristics Of The Seeds Of Garden Flowers Of Utah And A Key For Their Identification, Naia H. Burkey
Distinguishing Characteristics Of The Seeds Of Garden Flowers Of Utah And A Key For Their Identification, Naia H. Burkey
Theses and Dissertations
The purpose of this thesis has been to make a collection of the seeds of herbaceous dicotyledonous garden flowers of Utah, to examine their external structural characteristics and to prepare keys for their classification. A collection of the seeds of 146 species of garden flowers has been made, and includes species of 41 families. The seeds have been cleaned and dried and a collection stored in labelled vials and left in the Botany Department of the Brigham Young University. Keys have been prepared for the identification of the families, genera, and species. As far as possible external characteristics--such as color, …
A Critical Study Of The Genus Pantosteus (Catostomidae), Keith M. Standing
A Critical Study Of The Genus Pantosteus (Catostomidae), Keith M. Standing
Theses and Dissertations
The purpose of this paper is to critically study and analyze all species belonging to the genus Pantosteus and to determine tbe validity of the characteristics that were used to separate the genus Notolepidomyzon from the genus Pantoateus. Special reference was made to the morphology of the fontanelle and the weberian ossicles. In order to more thoroughly comprehend the reasons for Cope describing Pantosteus as a new genus and Fowler describing Notolepidomyzon as a new sub-genus and then Snyder elevating it to the status of a genus as complete a historical sketch as possible was made using all literature known …
The Succession Of Vegetation On A Southern Utah Sand Dune, Elias S. Castle
The Succession Of Vegetation On A Southern Utah Sand Dune, Elias S. Castle
Theses and Dissertations
The sand dunes lying ten miles northwest of Kanab in Kane County, Utah, support a sparse plant cover with four species dominating the vegetation: Psoralea stenostachys, Sophora stenophylla, Oryzopsis hymenoides, and Wyethia scabra var. attenuata. Of these Psoralea and Wyethia are endemic to the dunes or to a limited area which includes the dunes. The pineer species gain a start in the valleys between dunes and occupy the area only until sand covers them or until sand is blown away from their roots. Stabilization of the soils is not permanently in the interdune valleys and the dunes continue to wander. …
The Chromatographic Purification Of Human Red Blood Cell Acetylcholinesterase, Richard P. Dunkley
The Chromatographic Purification Of Human Red Blood Cell Acetylcholinesterase, Richard P. Dunkley
Theses and Dissertations
A process of column chromatography of human erythrocyte acetylcholinesterase, using a cationic exchange resin, was investigated as a possible method for the primary partial purification of the enzyme on a large scale. The investigation was based, first; on a detailed study of the enzymatic stability to variation in hydrogen-ion and salt concentrations for periods of time extending to forty eight hours and, second; on an investigation of the degree of adsorption by the resin of the enzyme at various pH values within the pH range of enzyme stability. A method for the analysis of the enzyme activity of large numbers …
Biological Oxidation Of Copper Sulfide Minerals, Delmar Boyd Davis
Biological Oxidation Of Copper Sulfide Minerals, Delmar Boyd Davis
Theses and Dissertations
This work represents a study of the biological oxidation of copper sulfide minerals. The principal objective of the study was to determine the extent of bacterial oxidation on copper containing sulfide minerals. It was also desired to determine if the bacteria could oxidize copper sulfides in the absence of iron. A better understanding of the nitrogen requirements of the organisms was desired. Minerals used in this study were Bingham Canyon Float Concentrate, chalcopyrite, covellite, calcocite, bornite, tetrahedrite, and reagent grade copper sulfide. The bacteria used were obtained from the mine waters of Bingham Canyon, Utah. To study the problem the …
The Skeletal Anatomy Of Several Species Of Salamanders With Special Reference To Bolitoglossa Rufescens (Cope), Afton M. Hansen
The Skeletal Anatomy Of Several Species Of Salamanders With Special Reference To Bolitoglossa Rufescens (Cope), Afton M. Hansen
Theses and Dissertations
This paper deals with the complete skeletal anatomy ot Bolitoglossa rufescena (Cope). All parts are figured and described. In addition to this many of the main skeletal parts of Bolitoglossa platydactyla (Cuvier) Bolitoglossa occidentalis Taylor, and Bolitoglossa flaviventris (Schmidt) are described and figured. A comparison of the following parts of the above mentioned salamanders is presented: skull, atlas, ninth trunk vertebra, sixth caudal vertebra, carpals, tarsals and digits. The similarities and differences are pointed out as they appeared to the author. The relationship and specialization ot these species is discussed rather briefly.
Some Preliminary Studies Of Rocky Mountain Spotted Fever Vectors In Utah, Marvin Dale Coffey
Some Preliminary Studies Of Rocky Mountain Spotted Fever Vectors In Utah, Marvin Dale Coffey
Theses and Dissertations
That the tick, Dermacentor andersoni Stiles, was the vehicle of transmission for the disease Rocky Mountain spotted fever was first suggested by Wilson and Chowning (1902). The disease itself has been recognized since 1873, being first known from the Bitter Root Valley of Montana. The first medical record, however, was reported from Idaho by Wood (1896).
A Preliminary Study Of The Effect Of Thyroxin On The Transport Of Glucose Across The Tubule Cells Of The Dog Kidney, Hayle Buchanan
A Preliminary Study Of The Effect Of Thyroxin On The Transport Of Glucose Across The Tubule Cells Of The Dog Kidney, Hayle Buchanan
Theses and Dissertations
The graduate studies of the writer began at Brigham Young University in the Autunm of 1951, at which time he filed his intention of majoring in Zoology and minoring in Chemistry. During the first three quarters he received instruction under his committee chairman in a sequence of courses entitled: "Body Fluids", "Neurology", and "Endocrinology". During the first of these three courses the role of the kidneys in the maintenance of a relatively constant internal environment was discussed. During the course in Endocrinology the following statement was found in the text which suggested that the thyroid hormone might have an influence …
The Spermatheca As A Taxonomic Aid In The Study Of Some Families Of Coleoptera, Lenord Daniel Moore
The Spermatheca As A Taxonomic Aid In The Study Of Some Families Of Coleoptera, Lenord Daniel Moore
Theses and Dissertations
In this study, the spermathecae of sixty-eight species of Coleoptera, representing fifty-one genera and twenty-three families, were examined and are listed in the order they appear in Leng's Catalogue of the North American Coleoptera. An examination was made of ninety-five specimens of four different species to check for variation within the species. In only one species was there a departure from the pattern characteristic of the genus. Ther spermatheca is differentiated into the cornu, the nodulus and ramus. It is a sac in the female for the reception and storage of the spermatozoa until used for fertilizing the eggs. Among …
Taxonomic Survey Of The Eggs And Larvae Of Some Species Of Utah Amphibia, Don B. Skousen
Taxonomic Survey Of The Eggs And Larvae Of Some Species Of Utah Amphibia, Don B. Skousen
Theses and Dissertations
How the eggs and larbae of the Utah amphibians differ from each other is the problem to be considered in this paper. Certain problems are yet to be answered. One problem is that the larvae of Rana pretiosa subsp. From utah fit the description of the Nevada form, Rana pretiosa luteiventris, as described by Thompson (1913) and not the description of Rana pretiosa pretiosa as set forth by Svihla (1935). Another problem is that the adults, tadpoles, and eggs of Rana pipiens brachycephala and Rana onca are strikingly similar. Rana fisheri of the Las Vegas Valley in nevada and Rana …
A Preliminary Study Of The Genus Carex In Utah County, Utah, William R. Liechty
A Preliminary Study Of The Genus Carex In Utah County, Utah, William R. Liechty
Theses and Dissertations
It has been the purpose of the author in this study to determine, as far as possible in the available tim.e, the number and kinds of Carex which occur in Utah County; their distribution in relation to region, soil, moisture and other factors, and to provide keys to the species and a description of each one that occurs in this natural area.
A Study Of The Fleshy Fungi Of Utah, Kent Howell Mcknight
A Study Of The Fleshy Fungi Of Utah, Kent Howell Mcknight
Theses and Dissertations
It is the purpose of this study to further the ends of Mycology by presenting the fleshy fungi which are known to grow in Utah. The term fleshy fungi as used here shall include those Ascomycetes and Basidiomycetes which produce large or otherwise conspicuous sporocarps and their closely related forms. This includes portions of the sub-classes Pyrenomycetes and Discomycetes of the Ascomycetes; and portions of the Heterobasidiao and Eubasidiae of the Basidiomycetes (4). The sporocarps may be fleshy, woody, papery, leathery, carbonous or waxy in texture. This would exclude the Myxomycetes. However, since there have been no extensive studies of …
A Preliminary Study Of The Vegetation In An Exclosure In The Chaparral Of The Wasatch Mountains, Utah, Verl Phillips Allman
A Preliminary Study Of The Vegetation In An Exclosure In The Chaparral Of The Wasatch Mountains, Utah, Verl Phillips Allman
Theses and Dissertations
The purpose of this study was to determine the ecological factors existing within the chaparral community. The present status of the vegetation in a one-acre exclosure was analyzed and recorded so that subsequent improvement or eterioration might be noted. A brief history of the area, the weather, and the geology are presented. Many other aspects of the problems enumerated in the introduction need to be studied. This study provides a foundation for a more detailed study of the vegetation which may be undertaken at a future date.
The Taxonomy Of Utah Orthoptera With Notes On Distribution, Andrew H. Barnum
The Taxonomy Of Utah Orthoptera With Notes On Distribution, Andrew H. Barnum
Theses and Dissertations
To an entomologist, the Orthoptera1 is in a state of confusion with respect to the available literature. Work has been done, and is now being done on the orthopteran fauna, but manuals tor identification of most species are not available for all sections or the country. Exclusive of a few lim-ited groups, Utah is among the areas that has no complete keys for taxonomic workers. In biological ivenstigations identification is essential: The species being studied must be definitely known. The primary purpose of this study, therefore, is to list the Utah Orthoptera and provide the keys necessary to their critical …
Some Studies On The Consortes Of The Norway Rat In Utah County, Utah, Roy J. Myklebust
Some Studies On The Consortes Of The Norway Rat In Utah County, Utah, Roy J. Myklebust
Theses and Dissertations
This study of the Norway rat, Rattus norvegicus (Erxleben) and its consortes was undertaken in Utah County to determine : (1} the frequency of infection of Trichinella spiralis (Owen) Railliet, the causative organism of trichinosis in humans, (2) the populations of fleas, lice and mites on the rat, and (3) the occurence of other consortes. This study covered a period from January 1951 through June, 1951. Additional records were made available from studies being made by the Department of Zoology and Entomology, Brigham Young University on parasitic arthropods (listed as Project Ten). The species ot fleas, and those mites which …
A Taxonomic Study Of The Catostomidae Of Utah Lake With Notes On The Fish Population, Lyle Junior Lowder
A Taxonomic Study Of The Catostomidae Of Utah Lake With Notes On The Fish Population, Lyle Junior Lowder
Theses and Dissertations
During the period from October 1950 to March 1951 a study of the taxonomy of the Catostomidae of Utah Lake was undertaken. Throughout this study information was collected on the numbers of suckers taken by some of the fisherman. From the data gathered it appears that the three species of Catostomidae cringinally named from Utah Lake are still there. The external morphological features of these fish are not recognizable unless they are observed very carefully. The most outstanding external characteristics used to differentiate the species are the mouth, lips, papillae on the lips and the general shape of the head. …
Galls And Gall Insects Of Artemisia Tridentata Nutt, Solomon Lander
Galls And Gall Insects Of Artemisia Tridentata Nutt, Solomon Lander
Theses and Dissertations
Galls of Artemisia tridentata Nutt. of Utah County were collected and described in detail. Of the ten galls collected, seven were caused by members of the Itonididae, two by members of the Trypetidae, and one by a member of the Curculionidae. Of the seven Itonid galls, six were caused by species of Diarthronomyia, and one by a species of Rhopalomyia. Two of the galls were caused by new species of Diarthronomyia. Three genera of the Scelionidae (Hymenoptera) and four genera of the Chalcidoidea (Hymenoptera) were also reared from the galls. A key to the ten galls was constructed, but does …
Ecology Of Passerine Birds Wintering At Utah Lake, Joseph R. Murphy
Ecology Of Passerine Birds Wintering At Utah Lake, Joseph R. Murphy
Theses and Dissertations
During the period of October to April of the winter of 1950-51, an ecological study was undertaken of a population or passerine birds wintering in a segment of the Utah Lake Shore. Available winter weather data indicated that although such factors as precipitation, temperature, and wind may often be severe, they are not critical enough to prevent a fairly large population of passerine birds from spending the winter months in the study locale. Five fairly distinct plant communities can be recognized in the area. There is evidence which indicates that certain passerine bird species are especially dependent on a particular …
An Ecological Study Of A Sphagnum Lake In The Subalpine Forest Of The Uinta Mountains Of Utah, Howard C. Stutz
An Ecological Study Of A Sphagnum Lake In The Subalpine Forest Of The Uinta Mountains Of Utah, Howard C. Stutz
Theses and Dissertations
A study was made of the ecology and floristics of a small bog lake referred to as Moss Lake, in the Grandaddy lakes region of the Uinta Mountains , Utah . Three consecutive summers, 1948, 1949, and 1950, were spent in collecting the data presented in this study. Throughout the study the following ecological measurements were made: 1. Water 2. Soil 3. Macroscopic vegetation 4. Plankton 5. Macroscopic animal forms.
A Preliminary Study Of The Distribution Of Fleas In Utah Known To Be Capable And Potential Vectors Of Plague, Dorald M. Allred
A Preliminary Study Of The Distribution Of Fleas In Utah Known To Be Capable And Potential Vectors Of Plague, Dorald M. Allred
Theses and Dissertations
Plague outbreaks in the past have been disastrous where domestic rats and their fleas of certain species were common. Plague has been known to occur in most parts of the world (Robertson 1923), and has occurred as human epidemics for many centuries (Dubos 1948).
A Taxonomic And Distributional Study Of The Subspecies Of The Iguanid Lizard Uta Stansburiana In The Eastern Great Basin 1950-1951, Dale D. Parker
A Taxonomic And Distributional Study Of The Subspecies Of The Iguanid Lizard Uta Stansburiana In The Eastern Great Basin 1950-1951, Dale D. Parker
Theses and Dissertations
This study is concerned with a critical analysis of species and subspecies of Uta stansburiana as it occurs in the Eastern Great Basin. In this study Urosaurus ornatus wrighti is also briefly discussed since it was until recently considered a member of the genus Uta and since it extends in the area which has been dealt with in this thesis. This problem necessitated study of large series of lizards in order to work out subspeciation. The material from the Brigham Young University collection and the specimens collected by the author total 520. After recording dorsal scale counts, prefrontal scales, keelation …
Alpine Plant Succession Near Mount Emmons, Uinta Mountains, Utah, Joseph R. Murdock
Alpine Plant Succession Near Mount Emmons, Uinta Mountains, Utah, Joseph R. Murdock
Theses and Dissertations
It was to provide some detailed information about the alpine flora , particularly as it relates to successional aspects , that the present study was undertaken . The environmental conditions of weather and soil , as they effect floral composition , are important factors in the plant succession or alpine communities . The investigation was designed to uncover such information about the alpine flora and environment necessary to establish the pattern of succession .