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Eutrophication Of Small Lakes, Lynn T. Kenison

Theses and Dissertations

An estimate was made to determine the amount of nitrate and phosphate entering Utah Lake in 1968. To make this estimate, the flow data for 1968 and the nitrate and phosphate concentrations for 1970 were used. This was done because of the lack of information. The results show that the total nitrate added to Utah Lake in 1968 was 7,638,000 pounds. The total phosphate added was 1,740,200 pounds. Of this amount, 12,4 per cent of the nitrate and 18.0 per cent of the phosphate was released from the lake through the Jordan River. The rest remained in the lake to …

Transition From Laminar To Turbulent Flow For A Two-Phase Mixture, Mohammed Sharief Qureshi

Theses and Dissertations

A phase is simply one of the states of matter. Multiphase flow is the simultaneous flow of several phases. Two-phase flow is the simplest case of multiphase flow.

Bacterial Receptor Sites For Uptake Of Transforming Dna, Douglas Pierre Bingham

Theses and Dissertations

Bacterial transformation is defined as a mechanism of genetic exchange whereby a population of bacteria can obtain genetic informa-tion as a result of cellular uptake and integration of extracellular deoxyribonucleic acid released from other bacteria by natural or in-duced lysis. In order for a transformable strain of bacteria to take up DNA and to undergo transformation, the cells must be in a physiolog-ical state called competence. A cell is referred to as competent if it has the ability to bind extracellular DNA irreversibly and subsequently to integrate and express the DNA.

A Computer Simulation Of A Partial Venous System Of A Human Lower Extremity, David C. Smith

Theses and Dissertations

The human body is truly a fascinating and complex creation of our Maker. Because of the complexity and variability, many of its workings were little known until recent years. Some of the more amazing facts of the circulatory system follow. If the individual blood vessels of a single adult, i.e., artery, arteriole capillary, venule and vein, were laid end to end, they would extend more than 60,000 miles. For the average adult, the heart beats 70 times per minute; for the well-conditioned athlete, 50-60 beats per minute; and for the extraordinary athlete, as few as 37 times per minute. The …

Characterization Of A Soluble Form Of Structural Protein From Neurospora Crassa, Clarence Denis Perterson

Theses and Dissertations

The study of membrane assembly has, until now, consisted of fractionating a membrane into its components or of assembling model membranes from non-physiological components. A native precursor to membranes was obtained as a quasi-crystalline material. It was the purpose of this work to develop the appropriate techniques for characterizing the material as well as to carry out the characterization. The results of the characterization indicate the quasi-crystalline material contains a single protein, structural protein. This protein is in two forms which may reflect two sequential steps in membrane assembly. One form is solubilized in 2-chloroethanol and isolated by gel filtration. …

End Matter, Vol. 13 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 13 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 13 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 13 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Taxonomic Revision Of The Weevil Genus Tychius Germar In America North Of Mexico (Coleoptera: Curculionidae), Wayne E. Clark

Brigham Young University Science Bulletin, Biological Series

A study of morphological characters of 4,000 adult weevils used in preparing a key and descriptions indicates there are fifteen North American species in the genus Tychius Germar. Adults occur on plants in the genera Astragalus, Baptisia, Hedysarum, Lotus, Lupinus, and Oxytropis.

The genus is divided into two species groups. The T. sordidus group appears to have representatives in the Old World fauna, but the T. semisquamosus group is probably native to North America. New names, Tychius caesius, and T. hirsutus are proposed for T. armatus Green, 1920 (not Tournier, 1873), and T. hirtellus LeConte, 1876 (not Tournier, 1873) respectively. …

Notes On Eriogonum - Vi : A Revision Of The Eriogonum Microthecum Complex (Polygonaceae), James L. Reveal

Brigham Young University Science Bulletin, Biological Series

This revision discusses seven closely related species of Eriogonum (Polygonaceae) found in the western United States of North America. One of the two major species, E. microthecum, is composed of nine varieties which range over a wide area of the Far West. The other major species, E. effusum, is found over a more restrictive geographical range mainly east of the Continental Divide. The remaining five species are primarily restricted to the Colorado-Green river drainage basin of Utah, Colorado, New Mexico, and northern Arizona. Together these entities form the core of a group of plants known as Section Corymbosa. …

Front Matter, Vol. 13 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 13 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Taxonomic Study Of Crotaphytus Collaris Between The Rio Grande And Colorado Rivers, William Ingram Iii, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

Little work has been done previously on the taxonomy of Crotaphytus collaris baileyi. This and the demonstration by Fitch and Tanner that C. c. baileyi is a heterogeneous grouping prompted the present study. Only the populations of the type material, the Upper Colorado River Basin, and the Chihuahuan Desert were studied. Multivariate, variance, canonical and discriminant analyses of external characters were performed, and pattern-coloration characters were examined on living specimens.

The results of the analyses show significance between all three populations. The discriminant functions distinguished between the populations with 80% reliability and patternal characters were discriminatory with near 100% reliability. …

Front Matter, Vol. 31 No. 1

Great Basin Naturalist

No abstract provided.

End Matter, Vol. 31 No. 1

Great Basin Naturalist

No abstract provided.

A Comprehensive Index To The Great Basin Naturalist, Volumes 1–30 Inclusive, 1939–1970, Vasco M. Tanner

Great Basin Naturalist

No abstract provided.

End Matter, Vol. 13 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 13 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Revision Of Cryptantha Subgenus Oreocarya, Larry C. Higgins

Brigham Young University Science Bulletin, Biological Series

This study is a taxonomic revision of Cryptantha subgenus Oreocarya (Boraginaceae), together with descriptions of species, synonyms, distribution maps, and discussions. The present treatment recognizes fifty-seven species and fourteen varieties, all separated by means of a comprehensive key, A history of the group, along with a discussion of distribution, ecology, and phylogeny is presented. As a basis for the comparison of taxa much of the research has been concentrated on morphological variation in herbarium specimens. Particular attention has been directed to a study of pubescence types, branching patterns, flowers, calyces, and fruit. The herbarium research has been correlated with extensive …

Land Use In Wah Wah And Pine Valleys, Western Utah, Joseph R. Murdock, Stanley L. Welsh

Brigham Young University Science Bulletin, Biological Series

This is a review of the use of public lands in Wah Wah and Pine Valleys in western Utah for grazing of livestock, mining, and other private enterprises. The total area of the two valleys is approximately 1,440 square miles of which about 30 square miles are privately owned. From the time grazing of domestic livestock was initiated in the 1870's and 1880's until 1934, the land was free public domain and was grazed on a first-come, first-served basis. Passage of the Taylor Grazing Act in 1934 ended free use of public lands. Existing evidence indicates that by 1934 the …

Evolution Of The Iguanine Lizards (Sauria, Iguanidae) As Determined By Osteological And Myological Characters, David F. Avery, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

The problem of phylogenic relationships within the iguanine phyletic line and the Madagascar iguanids have been investigated in order to explain the discontinuous distribution exhibited by the members of the family Iguanidae. Owing to inconclusive results from cytology and histological methods, the comparative morphology of the anterior osteology, myology, tongues, and hemipenes were used to determine relationships.

An examination of the above structures of the members of the iguanine phyletic lines and a comparison with the Madagascar iguanids indicates the following: ( 1 ) The Madagascar genera Chalarodon and Oplurus appear to be more closely related to each other than …

End Matter, Vol. 12 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 12 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 12 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Comparative Study Of The Relative Levels Of Physical Fitness Of Male Lds Missionaries Who Are Commencing And Those Just Concluding Their Missionary Service, Wilford J. Hoglund

Theses and Dissertations

The problem of this study was to determine the relative levels of physical fitness of male L.D.S. Missionaires who were commencing and those just concluding their missionary service. The study was conducted with 50 randomly chosen subjects in each group.

The following conclusions were drawn based on the findings of the study:
1. Returning missionaries were found to have experienced a significant decrease at the .01 level in the following areas: leg and back strength, total strength score, strength quotient, total seconds ran, total endurance score and over-all fitness score.
2. Returning missionaries increased in gripping strength at the .01 …

Civilizations Out In Space, Hollis R. Johnson

BYU Studies

No abstract provided.

End Matter, Vol. 12 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

High-Pressure Phase Studies On Sodium–Potassium Alloys, D. Ray Anderson, J. Bevan Ott, Rex J. Goates, H. Tracy Hall

Faculty Publications

The solid–liquid phase diagrams were investigated to 60 kbar for elemental sodium, potassium, and various sodium–potassium alloys. The data for Na and K are in general agreement with those of earlier workers. In the alloy system the temperatures of both the peritectic and eutectic halts increase as the pressure increases, but with different slopes, so that the two invariant points merge at approximately 35 kbar. Above this pressure, two halts are again observed. One increases with increasing pressure, and the other decreases with increasing pressure up to 55 kbar, where it abruptly starts increasing again. Melting points for samples in …

Two-, Three-, And Four-Particle Spatial Correlations Among Tertiary Cosmic Ray Muons, David D. Busath, R O. Stevenson

Faculty Publications

Showers of muons which result from interactions of primary cosmic rays high in the atmosphere appear deep underground as bundles of nearly parallel muons. For threshold energies of 1 TeV and arrival zenith angles of 45 degrees, those events having a small mean number of muons are described by a power law distribution in shower size having an exponent of ≅ -3.7 and a radial density distribution that decreases with distance R from the shower axis a little less rapidly than exp(-R/5.4 m). Comparison of new data on four muon spatial correlations in terms of the same phenomenology with data …