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Fate And Metabolism Of Bas 290-H In A Model Ecosystem, Kuo-Mei Chang

Theses and Dissertations

The use of chemicals to control economic pests has grown in this century both in the amount and the diversity of materials used (Headley and Lewis, 1967). About ten billion pounds of pesticides have been used in the United States since 1945. It is estimated that there are 340 million acres of cultivated lands in the Continental United States. Of this amount, approximately 119 million acres were sprayed with herbicides, 97 million acres were treated with insecticides and 25 million acres were treated with fungicides and other minor pesticides (Matsumura, 1972).

Community Characteristics Of Six Burned Aspen-Conifer Sites And Their Related Animal Use /|Clarry H. Kleinman, Larry H. Kleinman

Theses and Dissertations

Six forest areas destroyed by fire representing different seral stages of aspen development and conifer invasion were studied to determine successional dynamics and the related livestock and big game use. Factors measured were: (a) age, basal area, density and frequency of aspen and conifer trees; (b) density and frequency of under-story species; (c) forage production for forbs, grasses, and browse, and (d) animal-days use for deer, cattle and sheep. Aspen appeared in the community the spring following the fire and conifers appeared fifteen to twenty years later. Conifers had begun to dominate aspen on an eighty-two year old stand. The …

Interaction Between Triiodothyronine (T₃) And Thyroxine (T₄) In The Chick And The Rat, Kurtis George Cornish

Theses and Dissertations

The secretion of two hormones with identical function by the thyroid gland has been questioned, What is the relationship between these two hormones? Why does the thyroid secrete two hormones when either one can provide for all the activity of the thyroid (Greer, 1972). Little work has been done on the relationship between the two hormones. There is some evidence showing that thyroxine (T4) is deiodinated to triiouothyronine (T3) at the tissue level in mammals. Chambers (1970) found that there was a negative interaction between T4 and T3 when pharmacologic doses were administered to the rat. The present study was …

Time Of Mating And Incidence Of Conception And Implantation In The Post Partum Lactating Female Mouse, Paul A. Walter

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 Paul A. Walter on July 23, 1973.

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.

A Study Of Mercurials In The Elephant Butte Reservoir Ecosystem, John D. Garcia

Biology ETDs

Analyses of samples for mercury from Elephant Butte Lake collections were made by a flameless atomic absorption procedure. Mercury levels are expressed on a wet weight basis for animal tissues and on a dry weight basis for other materials. Analyses revealed mean ppb mercury concentrations of 0.027 in water, 57 in bottom sediments, 109 in phytoplankton, 277 in attached algae and bryophytes, 95 in plant debris, 69 in zooplankton, 90 in crayfish muscle, 26 in visceral mass of mussels, 97 in muscle of nonpredaceous fish, 125 in muscle of small predaceous fish, 253 in muscle of large predaceous fish, and …

Growth Studies On The Shigellae, Margaret Jane Gillespie

Biology ETDs

The growth of 20 strains of Shigella, representing the four species, was evaluated by the inoculation of pure cultures of single strains on Tryptic Soy agar (TSA) and four selective plating media. Colony counts of 18 strains were highest on TSA. While recovery on MacConkey (MAC) and Xylose Lysine Desoxycholate (XLD) agars was intermediate, very low counts occurred on Desoxycholate Citrate (DCA) and Salmonella-Shigella (SS) agars. Six strains plated on MAC and four strains plated on XLD gave colony counts 10% lower than TSA. With DCA and SS 15 and 16 strains, respectively, gave colony counts 50% lower than TSA. …

Temperature And Photoperiod Induction Of Cold-Hardiness In The Scorpion Paruroctonus Aquilonalis, Wayne A. Riddle

Biology ETDs

In order to investigate the nature of cold-hardiness in scorpions, adult Paruroctonus aquilonalis collected in August, 1972 near Albuquerque were exposed to ambient conditions of photoperiod and temperature, or to one of several artificial photoperiod-temperature regimes. Four specific laboratory regimes were established to describe the effect of photoperiod duration and temperature on supercooling point level. Conditions of these regimes were (i) constant photoperiod-constant temperature, (ii) constant photoperiod-decreasing temperature, (iii) decreasing photoperiod-constant temperature and (iv) decreasing photoperiod-decreasing temperature. Experimental conditions were either kept constant, or were decreased in increments from simulated summer conditions (26 C and 13-hr 15-min photoperiod) through the …

Reproduction In The Prairie Rattlesnake, Crotalus Viridis, And The Glossy Snake, Arizona Elegans, In New Mexico, Robert D. Aldridge

Biology ETDs

The reproductive cycles of the prairie rattlesnake, Crotalus viridis, and the glossy snake, Arizona elegans, in New Mexico were studied. In addition, experiments were conducted to determine the environmental cues that affect the reproductive cycle of the prairie rattlesnake and the effects of mammalian hormones FSH (follicle stimulating hormone) and HCG (human chorionic gonadotropin) on female prairie rattlesnakes.

The reproductive cycles of male prairie rattlesnakes and glossy snakes conform to the general pattern described for temperate zone snakes. The testicular tubules contain a sertoli syncytium during the winter and in the spring spermatogenesis begins. By midsummer sperm are present within …

Beef Cattle - At What Weight Should They Be Sold?, Franz Schwarz, J. B. Hassler

Nebraska Agricultural Experiment Station: Historical Research Bulletins

Specific objectives of this study are: (1) To evaluate the recent historical price relationships of the beef sector indicative of profit and loss conditions caused by disorderly aggregate performance in production and marketing. (2) To analyze the risks involved at various positions in the chain of production and marketing activities. (3) To suggest information and action programs which could reduce the amount of disorderly production and marketing.

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.

South Dakota Farm And Home Research, Agricultural Experiment Station, South Dakota State University

South Dakota Farm and Home Research: 1949 -1998

Recognition [p] 2
Barley Yellow Dwarf Virus [p] 3
Tornadoes in South Dakota [p] 6
Truck Transportation [p] 7
Feeding Whey to Dairy Cows [p] 11
Less Liver Abscess in Cattle [p] 15
Satellite Photos for Agriculture [p] 16

Inventory Of Lake Studies In Maine, Charles F. Wallace Jr., James M. Strunk

Maine Collection

Inventory of Lake Studies in Maine

By Charles F. Wallace, Jr. and James M. Strunk

State Planning Office, Water Resources Planning Division, July 1973.

"Printed under Appropriation Number 4248.5 and financially assisted by planning grants from the United States Water Resources Council Title III funds."

Contents: Introduction / Investigating Agencies / Federal Agencies / State Agencies / Regional Planning Commissions and Economic Development Districts / Maine Colleges and Universities / Private / Other Private / Other / Appendices

Genetic Technology: Law And Policy For The Brave New World, Harold P. Green

Indiana Law Journal

No abstract provided.

Informed Decisionmaking In Genetic Counseling: A Dissent To The "Wrongful Life" Debate, Alexander Morgan Capron

Indiana Law Journal

No abstract provided.

Theological Reflection And The New Biology, David H. Smith

Indiana Law Journal

No abstract provided.

The Purpose Of Death: A Reply To Professor Dworkin, Alexander Morgan Capron

Indiana Law Journal

No abstract provided.

Gene Therapy And Genetic Engineering: Frankenstein Is Still A Myth, But It Should Be Reread Periodically, George A. Hudock

Indiana Law Journal

No abstract provided.

A Comparative Limnological Survey Of Brackish-Water Lake And A Fresh-Water Lake At Mount Trashmore, Virginia Beach, Virginia, Gene Ramon Cocke

Biological Sciences Theses & Dissertations

No abstract.

A Simulation Model Of Peromyscus Leucopus In An Area Of The Great Dismal Swamp, James E. Paschal Jr.

Biological Sciences Theses & Dissertations

A computer simulation model was developed to explain the population dynamics of the white-footed mouse (Peromyscus leucopus) in an area of the Great Dismal Swamp. The model was designed to provide an experimental base for future studies. The model indicates relationships between food availability, home range size, competition with Peromyscus nuttali habitat selection and reproduction.

White-footed mice were trapped in the Old Dismal Town site during each season from April, 1972 through March, 1973. The age-sex structure of the population was determined, and was compared with the simulated structure. Although there were significant discrepancies between the comparisons, the …

Phytoplankton Succession In The Lafayette River, Estuary, Norfolk, Virginia, Thomas W. Purcell Lll

Biological Sciences Theses & Dissertations

Abstract unavailable.

Cytogenic Studies Of A Chesapeake Bay Population Of Molgula Manhattensis (Dekay) (Ascidiacea: Stolidobranchia), Elizabeth A. Crawford

Biological Sciences Theses & Dissertations

Abstract unavailable.

Food And Feeding Of Fishes From Magothy Bay, Virginia, Joseph J. Kimmel

OES Theses and Dissertations

No abstract provided.

Community Structure And Production In A Marsh On The Southern Branch Of The Elizabeth River, Virginia, Michael Bassett Robblee

Biological Sciences Theses & Dissertations

Four different plant communities occur on the Southern Branch of the Elizabeth River, Virginia, 1. Spartina alterniflora, 2. Distichlis spicata - Spartina patens - Juncus roemerianus, J. Baccharis halimifolia - Iva frutescens and 4. Spartina cynosuroides. The cordgrasses s. alterniflora and S. cynosuroides dominate the marsh.

Based-on standing crop estimates S. alterniflora produced 1218.6 grams dry wt/m² and S.cynosuroides 1681.3 grams dry wt/m², which is much higher than generally assumed for Virginia marshes. Evidence for the presence of two crops of S. alterniflora on the marsh during the growing season is-presented.

Two animal associations, composed …

A Zooplankton Study Of Stumpy Lake, Virginia Beach, Virginia, Jose E. Hernandez

Biological Sciences Theses & Dissertations

A one year study was made of the zooplankton composition in Stumpy lake, a reservoir in the city of Virginia Beach, Virginia. Quantitative and qualitative -parameters were investigated under field conditions. The analysis of the data presents information on the monthly dynamics or the zooplankton and other fluctuations in the lake environment. It is the intention or this study to emphasize the seasonal changes in the zooplankton community and their relationship to the ecological factors responsible for these variations.

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 …

Possible Avian Influences In The Distribution Of Dwarf Mistletoe, Paul James Zilka

Dissertations and Theses

The goal of this investigation was to determine the potential of birds as vectors for the movement of dwarf mistletoe seeds and the means by which such movement could occur. Birds would greatly speed the rate at which these parasites move horizontally or vertically through the forest. Five areas in Oregon, heavily infected by six species of Arceuthobium were studied. Observations of avian behavior point to 13 species whose general behavior make them potential vectors in the distribution of these parasites. More specifically, the roosting and subsequent bathing behavior of most forest birds proves a very important means of potential …

Deterioration Of Seed Corn During Storage, Nirmal S. Gill, James C. Delouche

All Articles

No abstract provided.

Ardops Nichollsi, J. Knox Jones Jr., Hugh H. Genoways

University of Nebraska State Museum: Mammalogy Papers

Order Chiroptera, Family Phyllostomatidae, Subfamily Stenoderminae. The genus Ardops is monotypic (Jones and Schwartz, 1967) as treated below.