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Growth And Development Of The Western Harvest Mouse, Reithrodontomys Megalotis Megalotis, Gary H. Richins

Theses and Dissertations

Growth rates, gestation period, litter size, reproductive age, sex ratios, and development were studied on 198 litters of Reithrodontomys megalotis megalotis. Growth was characterized by several standard skull and body measurements, and was partitioned into four phases of 1-3, 4-12, 13-22, and 23-70 days. Growth was best described by measurements of tail length, ear length, and dried eye lens weight. Reproductive activity began as early as 38 days for females and 59 days for males. Gestation period was 22 days and mean litter size was 3.83 (range 1-7). Sex ratio was 53.49% males to 46.51% females. Reproductive efficiency was 53.53%. …

The Effects Of Penicillin Upon The Fission Rate Of Dugesia Dorotocephala., John J. Fahsbender

Theses and Dissertations

Planaria (class Turbellaria) are the highest life forms which exhibit fission (Hyman, 1951). The laboratory planarian, Dugesia, lives in lakes, ponds, streams and springs, where it occupies bottom habitats. Fissioning is an asexual mode of reproduction. The fission plane is usually transverse, forming behind the pharynx, and separation appears to be dependent upon locomotion (Curtis, 1902). The posterior half of the worm adheres to the substratum while the anterior half continues to move forward until the worm snaps in two. Each half then regenerates the missing parts, forming two new smaller worms.

The Effects Of Thiamin Deficiency And Thiamin Antagonists On Cardiac Function In The Rat, D. James B. Sutherland

Theses and Dissertations

A study was made to determine what biochemical changes were involved in the slowing of the rat heart rate during thiamin deprivation, pyrithiamin or oxythiamin treatment. The appearance of bradycardia during progressive thiamin deficiency was shown to be related to the reduction in myocardial enzymatic activity of pyruvate (PDH) and 2-ketoglutarate (2-KGDH) dehydrogenase, and not due to inanition alone since pair-fed control rats did not show bradycardia until the agonal stage. Bradycardia was not the result of reduced energy since CP, ATP, ADP, and AMP levels remained normal even though PDH and 2-KGDH activity dropped to 20% of normal by …

Reproduction And Development Of Ferrissia Rivularis (Say) (Basommatophora: Ancylidae) And The Effects Of Maleic Hydrazide On Its Development And Fecundity, Yuan-Hsu Kang

Theses and Dissertations

Ferrissia rivularis was selected for research because of its local accessibility and because essentially nothing was known of its reproduction and development. Reproductive and developmental biology is first described herein from the natural environment. This is then compared with the effects created by experimental exposure to a selected herbicide, maleic hydrazide, which might be a potential threat to certain invertebrates in the natural environment.

The Purification And Characterization Of Cytochrome B₅ From Porcine Kidney, M. Dean Klingler

Theses and Dissertations

A soluble form of cytochrome b_5, with a 413/280 nm ratio of nearly unity, has been isolated and purified from porcine kidney using fractional precipitation, ion exchange resins, and gel filtration procedures. The cytochrome b_5 shows heat stability up to 50° and is stable in the pH range 6.0 to 8.5. The oxidized protein exhibits an absorption maximum at 413 nm, while the reduced form shows three peaks: 423, 526, 556 nm. Molecular weight determinations have given variable results, suggesting the possibility of a polymer composed of four and eight units of a 13,500 molecular weight protomer. This study has …

Thermodynamic Equilibrium Formation Constants And Molal Concentrations Of The Complexed Mercury-Containing Species Of Mercuric Chloride In Added Hydrochloric Acid And Methanol-Water Solvent Mixtures, Karl Jennings Walker

Theses and Dissertations

Saturated solutions of mercuric chloride in different methanol-water and hydrochloric acid solvent mixtures were equilibrated at 25.00 ± 0.01°C. Total mercury and free chloride concentrations were determined by analytical procedures and the data were analyzed with the aid of the computer. Tabulated below are the results of this study: [--see thesis for table--]

The Determination Of Thiamin And Its Derivatives In Brain Tissue Of Control, Thiamin-Deficient, Oxythiamin- And Pyrithiamin-Treated Rats, David S. Murdock

Theses and Dissertations

The determination of total thiamin, free thiamin, thiamin di phosphate (TDP) plus thiamin triphosphate (TTP), and total α- hydroxyethylthiamin (HET) levels in rat brain in control, deficient, oxythiamin- (OTH) and pyrithiamin- (PTH) treated rats was accomplished. It was found that the TDP + TTP/thiamin ratio observed in the thiamin-deficient, OTH- and PTH-treated rats was constant and did not differ from the ratio observed in the control rat brains. The brain levels of TDP + TTP decreased to 39% and 12% of the control thiamin levels in deficient and PTH-treated rats respectively. The brain HET and TDP + TTP levels of …

A Proposed Mechanism Of Action For In Vitro Excystation Of Two Species Of Coccidia, William Ronald Jolley

Theses and Dissertations

Excystation of coccidian oocysts is accomplished in vitro by altering wall permeability with CO2 and a reducing agent, then activating the enclosed sporozoites with a solution of trypsin and bile. Elucidation of the mechanism of action of the CO2-reducing agent treatment was the basic intent of this study. Oocysts of Eimeria stiedae (rabbit) and E. tenella (chicken) were tested for the presence of an excystation-associated enzyme by incubating sporulated oocysts in fluids extracted from variously treated oocysts, and by carbon-14 labelling; the effect of CO2 -reducing agent treatment on oocyst walls was investigated by titration with acid or base for …

The Effect Of Ethanol Ingestion On Liver Microsomal Phosphatidyl Choline Biosynthesis., David Nelson Skurdal

Theses and Dissertations

No abstract provided.

A History Of The Involvement Of The Church Of Jesus Christ Of Latter-Day Saints In The Tanning Industry In Utah From 1847 To 1973, Paul Edwards Damron

Theses and Dissertations

This thesis reports the extent of the tanning industry in Utah from 1847 to 1973 and explains the relationship of The Church of Jesus Christ of Latter-day Saints with this industry.

The tanning industry was essential to the survival of the pioneer communities in Utah until the coming of the railroad in 1869. Two important factors affecting this industry were external competition and Church support. In fact, the industry survived eastern competition because it was Church-supported. However, all Church support ended in the early 1900's, and except for a few businesses which soon ceased operation, the tanning industry in Utah …

The Effect Of Aflatoxin B1 On Growth Rate And Iron Metabolism In Juvenile Mongolian Gerbils (Meriones Unguiculatus), William Stanley Hastings Jr.

Theses and Dissertations

The metabolic secretions from Aspergillus flavus, aflatoxins. are often found as contaminants of agricultural products used for human and animal consumption. Aflatoxin B1 is the most toxic and carcinogenic of the aflatoxins. A reduction in weight gain has been observed when juvenile animals are fed aflatoxin B1 over an extended period of time. This reduction in weight gain may possibly result from an anemic condition induced by an alteration of iron absorption and/or distribution. The effect of chronic sublethal levels of this hepatocarcinogen on weight gain and the uptake and distribution of 59Fe++ were studied in this investigation.

An experimental …

An Analytical Assessment Of Vocational Occupational Training Programs In Selected State Correctional Institutions., Daniel Raymond Boyd

Theses and Dissertations

No abstract provided.

An Analysis Of The Personal Economic Knowledge Of North Dakota High School Juniors And Seniors., Richard L. Hilde

Theses and Dissertations

No abstract provided.

Individualized Instruction: A Model For Teacher Preparation., Thomas Francis Pond Jr.

Theses and Dissertations

No abstract provided.

The Linings Of The Spinal Subarachnoid Space In The Dog As Revealed By Scanning Electron Microscopy, Miles W. Cloyd

Theses and Dissertations

No abstract provided.

Effect Of Lithium On Structure And Function Of The Rat Biliary System, Larry P. Larson

Theses and Dissertations

No abstract provided.

The Open Classroom, Joseph E. Tyney

Theses and Dissertations

No abstract provided.

The Vermilion Lake Gold Rush Of 1865-1866 : A Speculative Failure, Dana H. Miller

Theses and Dissertations

No abstract provided.

An Investigation Of Willer's The Social Determination Of Knowledge : A Qualitative Approach, Timothy J. Boardman

Theses and Dissertations

No abstract provided.

Coorientational States As Antecedent Conditions For Listening Behavior, Virginia Triebold Buchli

Theses and Dissertations

No abstract provided.

Instance Of Blocking In The Goldfish (Carassius Auratus), James A. Henry

Theses and Dissertations

No abstract provided.

Pattern Of Watershed Enrichment And Its Effects On Nutrient Budgets And Weed Growth In A Culturally Eutrophied Lake, Stanley James Miekicki

Theses and Dissertations

No abstract provided.

Habitat Preferences Of Three Species Of Cricetid Rodents In A Patchy Environment, David H. L Olson

Theses and Dissertations

No abstract provided.

Spinal Nerve Root Exits From The Subarachnoid Space In The Dog, John J. Malloy

Theses and Dissertations

No abstract provided.

The Rifle Volunteers 1859-1861 : Mid-Victorian Xenophobia Manifested, William L. Adams

Theses and Dissertations

No abstract provided.

Transactionalism In Contemporary Art, Psychology And Music, Charlotte Alicyn Werner

Theses and Dissertations

No abstract provided.

Information Need, Form, Source, And Use As Perceived By Elementary Educators., Ronald M. Torgeson

Theses and Dissertations

No abstract provided.

A Systematic Study Of The Formica Obscuriventris Subgroup, With Notes On Colony-Founding In The Formica Rufa Group (Hymenoptera: Formicidae)., Akey Chang-Fu Hung

Theses and Dissertations

No abstract provided.

The Lyrics Of Li Yu: A Translation, Analysis And Commentary, Stephen Shu-Ning Liu

Theses and Dissertations

No abstract provided.

Glucose 6-Phosphate Phosphohydrolase Activity In The Vertebrate Brain, John Michael Haun

Theses and Dissertations

No abstract provided.