Life Sciences Commons^™

Aortic Cannulation As An Experimental Tool In ¹³⁷Cs Metabolic Studies, Lyman B. Spaulding

Biology ETDs

Tissue accumulations of cesium-137 by the white laboratory rat, Rattus norvegicus, were studied by varying the length of time between isotope introduction and sacrifice, the temperature of the animal, and the route of administration of the radioisotope. Most tissues from animals in the normothermic and hypothermic condition accumulated their major ¹³⁷Cs component within the first minute of isotope introduction. The temperature of the animal (18 C) was observed to influence tissue accumulation. Hypothermia limited uptake of radiocesium by peripheral tissues but enhanced uptake by internal tissues. Route of administration (i.a. and i.p.) differences were observed for only the heart …

An Ecotypic Differentiation Of Human And Bovine Fecal Streptococci, With Application To Human Pollution In The Yakima River, Harlen Harvey Johnson

All Master's Theses

It was the purpose of this study to report on the development of a technique for distinguishing human fecal streptococci from bovine fecal streptococci, and to make application of this technique in describing some of the sources of pollution in the Yakima River as contributed by the Wilson Creek drainage system, in the Ellensburg area of Washington.

Ecological Determination Of The Hour Of Nest Opening By An Ant, A. Dwight Smith

Loma Linda University Electronic Theses, Dissertations & Projects

The timing of daily opening of the nest entrance by the red harvester ant Popnomyrmex californicus was studied during all four seasons. Multiple regression analysis of several , environmental variables shows that the variation from day to day in mean opening time can be attributed to temperature differences, with the time that a given temperature was reached being the most important single variable for the autumn days studied. An equation incorporating this and the minimum temperature was sufficient to specify the mean opening time to within a few minutes. For the spring days, it was necessary to combine sunrise time …

Electrophoretic Demonstration Of The Hybrid Origin Of The Gynogenetic Teleost Poecilia Formosa, Peter Abramoff, Rezneat M. Darnell, Joseph Silvio Balsano

Biological Sciences Faculty Research and Publications

No abstract provided.

Effects Of The Mutants Brown And Brown-Dominant On Pteridine Content In Drosophila Melanogaster, Donald M. Evans

Biology ETDs

The pteridine content of a brown, a brown-dominant, and a wild stock of Drosophila melanogaster was studied. The separation by ascending two-dimensional chromatography of the pteridine substances revealed differences in the number and quantity of pteridines present in these stocks. Differences also were found between pteridine content of heterozygotes and the corresponding homozygotes. The dominance and recessiveness, as reflected in eye color, did not extend to the level of pteridine metabolism, and pteridine substances were found in some heterozygotes that were not present in either homozygous parental stock.

The Effects Of Exercise On The Response Of Rats To Air Blast, Kabby Mitchell Jr.

Biology ETDs

The mortality of rats exposed to the combined effects of air blasts and exhaustive exercise was investigated. Five hundred rats were ex­posed to sharp rising air blasts of 300 to 400 msec durations in a shock tube after which 250 rats were swum at different times and for varying periods post blast. There were 250 blast controls and 95 swim controls.

In the primary experiment, rats were swum to exhaustion begin­ning 15 min after exposure to graded levels of air blast. In the three other series of experiments, animals were swum to exhaustion at 5 min after blast; swum to …

131i Metabolism In The Beagle Dog As Affected By Age And Route Of Exposure, Robert E. Foreman

Biology ETDs

Seven parameters were chosen to characterize¹³¹I metabolism in the Beagle, three were derived from the thyroid uptake -retention curve [maximum thyroid uptake, time to 90% maximum uptake, and biological half-life] and four from the two component whole-body¹³¹I retention curve [component intercept values, and component half-times]. These parameters were used to compare ¹³¹I metabolism in three age groups [6 , 18 , and 48 months], each consisting of six Beagles exposed to a single dose of ¹³¹I [ 100-300 µCi] by the inhalation route. An analysis of variance was performed on each parameter in this …

Uptake And Retention Of Tritiated Water By Tissues Of Laboratory Rats And Citellus Lateralis, Gary L. Bintz

Biology ETDs

Tritiated water was employed to study selective absorption and retention of water by different tissues of laboratory rats and C. lateralis. Control (hydrated) and water deprived (dehydrated) animals of both species were studied. Tissues analyzed included large tissues capable of water storage (skin, blood, muscle, liver, white fat) and tissues involved in exchange of water with the environment (small intestine, kidney, lung). The data demonstrated considerable variability in tritium contents, both in different tissues of the same animal, and in the same tissues of different animals of the same group. There appeared to be no selective uptake nor retention of …

Regeneration Of The Tentacles And Eyes Of The Marine Snail Ilyanassa Obsoleta Stimpson, W. Ernest Collins Jr.

Masters Theses & Specialist Projects

The study consisted of two major steps: (1) A macroscopic study was undertaken to determine whether or not the eye and tentacles of a gastropod which exhibits a mosaic development pattern could regenerate. (2) A study was undertaken using histological techniques to determine the detailed step-by-step process of regeneration of the eye and tentacle in Ilyanassa obsoleta.

The Development Of The Embryo Sac In Ranunculus Glaberrimus Hook, Chung-Ping Chin

All Master's Theses

A comparative study of embryological and morphological characters of the ovule in the family Ranunculaceae indicates that considerable variation exists within this family.

The Effect Of Follicle-Stimulating Hormone And Testosterone Propionate On The Reproduction Of The Bull Snakes, Pituophis Melanoleucus Catenifer And Pituophis Melanoleucus Affinis; Accompanied With Analysis Of Changes In Blood Protein Constituents Following Stimulation, Jack Bradford

All Master's Theses

The bull snake, Pituophis melanoleucus, was chosen for this experimentation for several reasons; (1) it is relatively abundant in Central Washington (2) it is a large snake, well able to withstand the effects of the frequent blood samplings which were necessary in this experimentation ... (3) the bull snake is an oviparous snake and ova development is rapid and after dissection, obvious.

Forest Survey Of Guadalupe Mountains, Texas, James L. Robinson

Biology ETDs

A vegetational study of an area of the Guadalupe Mountains, Culberson County, Texas, was made to help evaluate the ecological impact on the area if a national park should be located at this site. The stands of coniferous forest in the study area, completely surrounded by vegetation typical of the Chihuahuan desert, are considered to be remnants of a more extensive coniferous forest during the Late Pleistocene. Thus the remaining stands are referred to as relict outliers. The dominant species occurring in the area vary, depending on slope exposure, from Pinus ponderosa and Juniperus deppeana on the south-facing slopes to …

The Uptake Of Calcium By Iso Lines And Kentucky Varieties Of Nicotiana Tabacum L., Francis J. Shay

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 Francis J. Shay on July 18, 1968.

Ecological Factors Controlling Population Distribution Of The Burying Beetle, Nicrophorus Orbicollis Say, Gerald L. Demoss

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 Gerald L. DeMoss on July 11, 1968.

Population Dynamics Of Peromyscus Leucopus, Maxwell S. Sanders Jr.

Morehead State Theses and Dissertations

A thesis presented to the faculty of the School of Science and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science by Maxwell S. Sanders Jr. in July of 1968.

Geographic Variation In Dicamptodon Ensatus (Eschscholtz) With Notes On Life History And Zoogeography, Ronald A. Nussbaum

All Master's Theses

The purpose of this paper is to present information concerning geographic variation between three northern populations of Dicamptodon, and to add to the meager store of information concerning the life history and biology of the species.

Refractoriness Of Pet Mouse Integument To The Nerve Growth Factor, Walter Hollified Dorman

Master's Theses

This paper deals with the refractoriness of PET mouse integument to the subcutaneous administration of nerve growth factor. Newborn mice were injected once daily with NGF through ten injections. Gross and histological examination showed that the skin of the experimental animals was completely unresponsive to this agent. No alterations in the hair growth cycle or pattern were observed.

The Effects Of Estradiol Benzoate On Protein Synthesis By The Isolated Perfused Snake Liver, William Ralph Boone

Master's Theses

The effect s of estradios benzoate on protein synthesis by the isolated perfused liver of Natrix fasciata fasciata (Linnaeus, 1766), the southern banded water snake, were investigated. The incorpora­tion of carbon-14 labeled leucine into plasma protein of the liver perfusate was used as an index of protein synthesis by the perfused liver.

Both control and experimental livers demonstrated incorporation of the labeled leucine into plasma protein. However, estrogen treated livers expressed significantly greater incorporation of the amino acid into plasma protein giving an almost linear response. Total plasma protein levels were also significantly higher in the perfusions involving estrogen treated …

Colonial Independence Of Feeding Among Zooids Of The Ectoproct Lophodella Carteri (Hyatt), Leonard M. Bahr

Master's Theses

Possible interactions of feeding between zooids of colonies of the freshwater ectoproct Lophopodella carter! were investigated. Suspensions of Euglena gracilis at a concentration of 558x10³ cells ml^-1 were cleared by L. carter at a rate of 2.7 x 10^-3 ml min^-1 zooid^-1 for15 minute periods. The rate of ingestion of E. gracilis by L. carter was independent of the size of colony and decreased exponentially with time, declining to about one third the original rate in 60 minutes.

Niche Differentiating Mechanisms In Two Sympatric Species Of Swallows, David Thomas Moody

All Master's Theses

The present study considers certain aspects of the ecologies of cliff swallows (Petrochelidon pyrrhonota) and bam swallows (Hirundo rustica) in an area of overlap, where both species are found nesting together and foraging over the same fields. Careful attention was given to foraging flight patterns, foraging elevations, and food consumed by each species in an effort to determine whether or not there is any evidence of competition for food resources. Aggressive interactions between the species were recorded, and the general timing of their nesting cycles was noted.

Concurrent Infections Of Schistosoma Mansoni And Trypanosoma Equiperdum In Mice, Venus Ee-Siriporn

Loma Linda University Electronic Theses, Dissertations & Projects

The purpose of this investigation was to determine factors which may influence the survival time of mice infected with Trypanosoma equiperdum and the effects of T. equiperdum on mice infected with Schistosoma mansoni.

In order to maintain experimentally obtained standard hours of survival (88 hrs) in mice inoculated intraperitoneally with 150,000 T. equiperdum, it was found that trypanosomes removed from the donor rat should be kept at 25 C and all counts, dilutions of the organisms, and injection should be completed within 1 hour after removal from the donor host. Survival time of mice is increased as the …

Some Aspects Of Carbohydrate Metabolism In The Cercariae Of Schistosoma Mansoni Sambon, 1907, A. Eugene Dunham Jr.

Loma Linda University Electronic Theses, Dissertations & Projects

Cercariac of Schistosoma mansoni were studied for glycogen utilization, uptake of glucose from solution, lactic acid production, and respiration.

Using the anthrone method of determination of carbohydrate, the amount of glycogen used by a single cercaria in 4 hours is determined as 43.2 x 10^-4 μg ± 6.6 x 10^-4 μg.

Glucose was not observed to have been used from solution under the conditions of the experiment, even in the presence of trehalose. The determinations were made by the Glucostat method.

After deproteinization and desugarization, aliquots of supernatant from cercarial suspensions were analyzed for lactic acid using p-phenylphenol …

A Comparison Of Glucose And Acetate Metabolism During Spore Germination In Phycomyces Blakesleeanus, Colin A. Campbell

Loma Linda University Electronic Theses, Dissertations & Projects

[Abstract Not Included]

Normal Development Of The Aortic Isthmus, Elizabeth Short

Yale Medicine Thesis Digital Library

The development of the aortic isthmus, that region of the arch of the aorta between the left subclavian artery and the attachment of the ligamentum arteriosum, has received little attention. While the developmental history of the ductus arteriosus and foramen ovale has been well documented, as have the cardiac malformations associated with failure to complete this developmental sequence, little work has been done to define the normal sequence of isthmus development in its transition to an adult configuration in the postnatal period. It has long been recognized that the cardiac malformation known as infantile or preductal coarctation of the aorta …

The Effect Of Cesium-123 On Cesium-137 Uptake By Tissues In The Laboratory Rat, Richard Riley Tokarz

Biology ETDs

The effects of stable cesium-133 on cesium-137 metabolism were studied to better define mechanisms of cesium transport and binding by rat tissues. The extent to which the hypothetical cesium transport system can be overloaded was examined by giving cesium-133 and cesium-137 intraperitoneal injections within short time intervals. Whole animal and isolated tissue counts were made with a small animal whole body counter. Stable cesium-133 (0.02 g per animal) injected from 3 minutes to 24 hours prior to cesium-137 (0.15 ml containing 0.24 µCi per 100 g body weight) had little effect on the uptake of cesium-137 by tissues. Expressing data …

A Comparative Food Habit Study Of Two Species Of Kangaroo Rats - Dipodomys Ordi And Dipodomys Merriami, Marilyn Kobylack Dunham

Biology ETDs

The present study was undertaken to investigate the food habits in two species of kangaroo rats, Dipodomys ordi Woodhouse and Dipodomys merriami Mearns, by comparing the seeds that they store in their cheek pouches. Since both species of kangaroo rat occur sympatrically at many places in the Southwest, Gennaro (1966) has concluded that interspecific competition with D. ordi might serve to limit the northern distribution of D. merriami in the Rio Grande Valley of New Mexico. The nature of this interspecific relationship was investigated through a comparison of the seeds of both species.

Investigations have revealed that there is a …

Studies Of Diet As A Factor In 137-Cesium Metabolism In Rats, Morris Burton Snipes

Biology ETDs

Effects of diet on ¹³⁷Cs retention and distribution in the rat were examined. After a 7-day period, retention of an intraperitoneal dose of ¹³⁷Cs was higher than control values for rats fed semistarvation, high carbohydrate, high protein, and high fat diets. Relative distribution of ¹³⁷Cs among tissues .was examined considering changes in tissue composition due to diet variation. The primary effect of diet on cesium metabolism was a modification of cesium excretion via urine and feces. There appeared to be a direct relationship between mass of fecal material and the amount of ¹³⁷Cs excreted in feces. …

Geographical Variation Of The Apache Pocket Mouse In New Mexico, Daniel F. Williams

Biology ETDs

The geographic variation of Perognathus apache Merriam in New Mexico was investigated to determine the relationship of P. apache to P. flavescens Merriam and the relationships of the subspecies of P. apache to each other. Skin and skull measurements of adult specimens were analyzed statistically. Relative color values for adult specimens were estimated by selecting two individuals as color standards and comparing the other specimens with the standards. Apache pocket mice from southwestern New Mexico were found to be closer in size and proportions to the smaller P. flavescens from eastern New Mexico than to the larger Apache pocket mice …

Behavioral Changes In Ants During Radiation Exposure, Niel Henry Milton Berg

Biology ETDs

There are only a few reports concerning the response of ants to irradiation and the majority of these are based on unpublished work. Apparent misinterpretations regarding the avoidance by ants of irradiation have occurred because of confusion as to dose, dose rate, and the type of radiation used. The only apparent demonstration of ant avoidance to radiation was made using x-rays at dose rates of 50-70 r/sec, although one author cites evidence for an ant avoidance response to 10 r/hr of 137Cs gamma rays.

In the present study, queen ants of the genus Pogonomyrmex, and worker ants of the species …

A Study Of The Extent Of Spread Of Infestation, Effects, And Possible Control Of The Tent Caterpillar In Lewis County, Kentucky, Edna Mae Love

Morehead State Theses and Dissertations

A thesis presented to the faculty of the Graduate School at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Arts by Edna Mae Love on May 22, 1968.