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End Matter, Vol. 19 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Taxonomy Of The Genus Chloris (Gramineae), Dennis E. Anderson

Brigham Young University Science Bulletin, Biological Series

This study is a worldwide taxonomic treatment utilizing endomorphic characters such as cytology, histology, and embryology, in addition to the traditional exomorphic features. New chromosome numbers and histological information are reported. Relationships between Chloris and other genera in the Chlorideae are discussed. A total of 56 species is recognized in the genus; each is described and illustrated. Complete synonymies are included as well as a list of unidentified or rejected names. Distributions and maps are given for each species, along with lists of specimens examined during studies at various herbaria. Reports of field studies involving introgression among certain species are …

Front Matter, Vol. 19 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 19 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

New Species Of American Bark Beetles (Scolytidae, Coleoptera), Stephen L. Wood

Brigham Young University Science Bulletin, Biological Series

The following 156 species of American Scolytidae are described as new to science: Cnesinus reticulus (Venezuela), C. beaveri (Brazil), C. teretis (Venezuela), C. alienus (Venezuela), C. deperditus (Colombia), C. fulgens (Venezuela), C. fulgidus (Colombia), C. lucaris (Venezuela), C. triangularis (Colombia), C. brighti (Mexico), C. coracinus (Mexico), Bothrosternus lucidus (Brazil), Hylastes niger (Mexico), Xylechinus mexicanus (Mexico), Phloeotribus nanus (Brazil), Chramesus corniger (Mexico), Ch. disparilis (Mexico), Ch. variabilis (Mexico), Ch. microporosus (Mexico), Ch. aquilus (Mexico), Ch. wisteriae (Mississippi), Ch. marginatus (Mexico), Carphoborus piceae (Oregon), Carphobius cupressi (Guatemala), Cladoctonus atrocis (Brazil), Scolytodes canalis (Mexico), S. costabilis (Mexico), Pseudothysanoes contrarius (Mexico), P. recavus (Mexico), …

The Effect Of Walking And Jogging On Selected Cardio-Respiratory Parameters Of Middle-Age Men During The Initial Phase Of A Training Program, Monsuru Lasun Emiola

Masters Theses

No abstract provided.

End Matter, Vol. 19 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Effect Of Speed Of Muscle Contraction On Strength Improvement, Terry Alan Dieckhoff

Masters Theses

No abstract provided.

Quantitative Analysis Of Respiratory Cell Activity, Charles Lewis Webber

Dissertations

No abstract provided.

Effects Of Diethylstilbestrol, Norethindrone, And Mestranol On Selected Microbes, John N. Haan

Master's Theses

No abstract provided.

Activation Of The Gamma Motor System In The Cat Following Selective Stimulation Of The Motor Cortex And The Pyramidal Tract, James Elliott Forbes

Theses and Dissertations

Until the mid to late 1800's, the cerebral hemispheres were considered to be only the sites of mentation and intellectual activity. On the basis of his observations of epileptic patients, HughIings Jackson (cited from Walshe, l935a) theorized that the cerebral hemispheres were also sites of motor control and sensory experience. The electrical excitability of the cerebrum was first demonstrated by Fritsch and Hitzig in 1870. Since then the motor representation of the various muscles has been mapped out and the types of movement in response to stimulation of the motor cortex and the pyramidal tract have been thoroughly studied.

Mammalian …

Cytotypes And Morphometrics Of Two Phyllostomatid Bats, Micronycteris Hirsuta And Vampyressa Pusilla, Robert J. Baker, Hugh H. Genoways, William J. Bleier, Jerry W. Warner

University of Nebraska State Museum: Mammalogy Papers

As pointed out by Jackson (1971) and Patton (1972), the key to understanding mechanisms of chromosomal evolution lies in studies of chromosomal variation within populations that can hybridize. Hybrids between cytotypes contain the answer to problems of meiotic pairing and reduced fertility, as well as information concerning the nature of zones of contact. However, before detailed studies can be initiated, chromosomal races and hybrid zones must be located. Few chromosomal races have been described for bats (Baker, 1970a). Within the family Vespertilionidae, five species are known to have such races (Baker, 1970a) and races have been reported in two species …

Physiological Comparison Of Plaque-Producing And Non-Plaque-Producing Streptococci With Emphasis On Mannitol Utilization, Brenda Castle

Morehead State Theses and Dissertations

A thesis presented to the faculty of the School of Sciences and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Biology by Brenda Castle on July 19, 1973.

Front Matter, Vol. 18 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 18 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Effects Of A Nuclear Detonation On Arthropods At The Nevada Test Site, Dorald M. Allred

Brigham Young University Science Bulletin, Biological Series

Fifty-three arthropod species were studied in an area affected by an underground nuclear detonation. These were represented by 10 species of ants, 17 beetles, 5 orthopterans, 4 scorpions, 6 solpugids, and 11 spiders (Table 16). Relative populations were determined prior to the detonation and at three periods after the detonation–(1) one and two months after (August and September 1962), (2) 11 months after (June 1963), and (3) 13 months after (August 1963). One and two months after the detonation, the number of species was reduced from the expected by 48 percent, by 52 percent after 11 months, and by 66 …

An Ecological Survey Of The Algae Of Huntington Canyon, Utah, Lorin E. Squires, Samuel R. Rushforth, Carol J. Endsley

Brigham Young University Science Bulletin, Biological Series

A quantitative and ecological study of the algae of Huntington Canyon, Emery County, Utah, was conducted from March 1971 to April 1972. Net plankton, nannoplankton, periphyton, and visible attached algae were studied. Certain physical and chemical parameters in the waters of Huntington Creek and a small pond along its course were also measured.

Huntington Creek contains a wide diversity of genera and species of algae. Diatoms are the main constituent of the flora of this stream throughout the year. Hydrurus foetidus is prevalent in Huntington Creek from late winter to early summer, and filamentous blue green algae abound in the …

End Matter, Vol. 18 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 18 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 18 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

The Peregrine Falcon In Utah, Emphasizing Ecology And Competition With The Prairie Falcon, Richard D. Porter, Clayton M. White

Brigham Young University Science Bulletin, Biological Series

This study was undertaken to record the known history of the Peregrine Falcon (Falco peregrinus) in Utah as we have been able to construct it from both the literature and from our original research that extends over about a 30-year period in the state. The present total population of the peregrine in Utah is possibly only 10 percent of what it has been in historic times. In an effort to find explanations for the decline, we have explored hypotheses of climatic changes, impact of pesticides, disease, and human disturbances. We conclude that pesticide contamination and climatic changes may …

Front Matter, Vol. 18 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Breeding Ecology Of Raptors In The Eastern Great Basin Of Utah, Dwight G. Smith, Joseph R. Murphy

Brigham Young University Science Bulletin, Biological Series

A comparative study of the breeding ecology of 12 raptor species was conducted in the eastern Great Basin from 1967-1970. The project was designed to determine the composition and densities, habitat selection, territoriality and predatory habits of raptorial birds in a semiarid environment. All topics were analyzed comparatively, relating the requirements and activities of the 12 raptor species.

Average yearly population densities of all species approximated 0.5 pairs per square mile, but much of the available habitat was not utilized. Predominant raptors were the Ferruginous Hawk and Great Horned Owl. Other important raptors included the Golden Eagle, Red-tailed Hawk and …

Front Matter, Vol. 18 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Method Of Analyzing Mandibular Movement, Richard B. Mccoy

Loma Linda University Electronic Theses, Dissertations & Projects

Mandibular movement is considered to be a fundamental factor in the study, analysis, and treatment of occlusion. For many years, dentists have realized that dental health depends upon the compatibility of mandibular movements and occlusion. This realization has led to the development of new methods and techniques for recording accurately and scientifically the movements of the mandible. In order for this data to be of scientific value, it must be stored in a usable form which is easily available for analysis.

The purpose of this research project was to develop a procedure for storing and recalling mandibular-movement information. Before such …

End Matter, Vol. 18 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Effect Of Various Nitrogen Sources On The Metabolism Of Miserotoxin In Astragalus Miser Dougl. Ex Hook., Robert Parker

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Wasatch milkvetch [Astragalus miser Dougl., var. oblongifolius (Rydb.) Cronq.] was highest in miserotoxin, a poisonous nitro compound, when potassium nitrate was used as the nitrogen source in nutrient cultures. Ammonium nitrate, added to Hoagland solutions to provide four and one-half times normal nitrogen, lowered percent miserotoxin in the plants. Plants grew abnormally in the greenhouse, producing little growth and becoming periodically senescent. High greenhouse temperatures, up to 45 C, were probably responsible for the abnormal growth.

Attempts to inoculate and fix nitrogen in Wasatch milkvetch with Rhizobium bacteria were unsuccessful in the greenhouse.

In growth chamber studies, percent miserotoxin …

A Study Of The Validity Of Two Indirect Predictors Of Maximal Oxygen Uptake, Robert V. Sedik

Masters Theses

No abstract provided.

The Effects Of Crowding On The Diurnal Ascorbic Acid Levels Of Albino Rats, Mary Jo Barr

Masters Theses

The adrenal physiology of the albino rat was studied through the measurement of adrenal ascorbic acid levels. A cyclic phenomenon was observed which follows the diel periodicity of the animal. Ascorbic acid values were found to be characteristically higher in males than in females. A similar difference was also seen in populations divided into young animals (body weight less than 175 grams) and old animals (body weight greater than 175 grams). Crowding, induced by manipulating the area of cage space per gram of body weight, was observed to be a definite stressor and caused the adrenal ascorbic acid levels to …

The Effects Of Acute Stress On Adrenal Ascorbic Acid Levels, Robert Joseph Collier

Masters Theses

The diurnal rhythm of adrenal ascorbic acid (DAR) displays an inverse relationship to the diurnal rhythm of circulating levels of plasma corticosteroids. Alloxan monohydrate, 175 mg/kg body weight was given subcutaneously to albino rats to determine the effect of the diabetic state on the DAR. A total of 200 female albino rats were divided into two study groups. Study Group I was composed of 150 animals divided into populations of 15, each including 3 controls. Study Group II was composed of populations of 5, each group containing all controls or all alloxinated rats. The populations of 15 were sacrificed at …