Life Sciences Commons^™

A Study Of The Correlation Of Acid Production And Population Growth In Escherichia Coli, Proteus Morgani And Shigella Sonnei, Lolita R. Fritz

Biology ETDs

During the course of growth in a bacterial culture, cellular development and reproduction take place in a regular and orderly manner. It is possible to observe definite phases in the normal growth of a culture. Some method of evaluation of the growth must be used in order to determine the population change or the effect of chemical and physical environment on bacterial cells. Numerous methods have been tried, employing the total population number or rate of production is used in this investigation as an indication of population growth of Escherichia coli, Proteus morgani and Shigella sonnei.

There has …

A Method For The Determination Of Adrenaline In The Presence Of Mono And Dihydroxy Compounds, Glenn H. Steinback

Biology ETDs

A method for the colorimetric estimation of adrenaline has been developed which makes it possible to determine the adrenaline in the presence of other dihydroxypheylamine compounds, specifically DOPA and tyrosine.

The method employed is a modification of the procedure of Sivadjian, using sodium chloride and hydrogen peroxide in the presence of related compounds, semicarbazide.

The method discussed is more specific than those in the literature but not as sensitive. The lower limit of the method is 25ᴽ, which is accurate to a plus or minus 5 per cent.

Data are presented to determine the optimum pH and standard concentrations for …

The Role Of Environmental Factors In The Metamorphosis Of Ambystoma Tigrinum Mavortium Baird, John Roberts

Biology ETDs

The problem presented by this paper are directly concerned with the environmental factors influencing metamorphosis in Ambystoma tigrinum, and since the thyroid and pituitary glands are important in amphibian metamorphosis a brief account of experiments relating to metamorphosis is given here.

The In Vitro Determination Of Human Blood Oxygen Saturation In The Presence Of High Concentrations Of Carbon Dioxide, Elizabeth D. Armstrong

Biology ETDs

Validation of the results obtained by the cuvette when used on blood with comparatively high carbon dioxide tensions will significantly extend the utility of the photoelectric method and is one of the objectives of this study. A second objective of this research is to develop by in vitro technique a simplified method for studying the effects of carbon dioxide on the human oxyhemoglobin dissociation curve.

Induced Neoteny In Ambystoma Tigrinum Mavortium Baird I. Treatment With Non-Hypophyseal Hormones, John E. Furchner

Biology ETDs

Metamorphosis in amphibia has been the subject of many investigations, not only because the phenomenon is a manifestation of growth and differentiation, but also because of the close relationship between metamorphosis and the thyroid gland.

The Development Of The Scholander Micro-Respirometer For Use In The Study Of Metabolism In Bacterical Endospores, Phillip G. Crook

Biology ETDs

In this paper, the Scholander micro-respirometer has been adapted, and techniques worked out, to permit its use in attacking the problems associated with endospore respiration.

A Special Respiratory Mechanism In The Adrenal Gland Of Cattle, Martin Roeder

Biology ETDs

The first definite evidence for the existence of an enzyme which catalyzes the biological oxidation of phenols was presented was presented in 1896 by Bourquelot and Bertrand. By 1902 the latter had characterized the enzyme as acting directly on the amino acid tyrosine, and had demonstrated its action against other substances, including p-hydroxyphenylethylamine, p-cresol, and phenol.

The Life Cycle Of The Ostracod Cypricercus Reticulatus (Zaddach, 1844) Sars, 1928, Louise E. Goeke

Biology ETDs

The purpose of the present study is to describe the stages in the life-cycle of the fresh-water ostracod, Cypricercus reticulatus (Zaddach,1844) Sars, 1928 of the family Cypridae. This particular species was chosen primarily because of availability. The selection of this species was fortunate since C. reticulatus was found to be easily adapted to laboratory conditions. In addition, the form was a fortunate selection because the period of time required for reproduction is relatively brief and the species reproduces parthenogenetically, thus eliminating difficulties incident to impregnation of the females.

A Study Of The Effects Of Electrical Stimulation, Gonadotrophin, And Thymus Upon The Metamorphosis Of Ambystoma Tigrinum Baird, Leon J. Butterfield

Biology ETDs

It was the purpose of this study, (1) to measure the polarization of zodiacal light, (2) to investigate the orientation of the plane of polarization, and (3) to deduce from results obtained information concerning the origin of zodiacal light.

A Preliminary Investigation Of The Species Of Water Mites Of The United States Rocky Mountain Region And Vicinity Of Albuquerque, New Mexico, David W. Bergstrom

Biology ETDs

The primary purpose of this research problem is to give a preliminary accounting of the species of Hydracarina or water mites found at several mountain localities in Colorado, Wyoming, Utah, Montana, and New Mexico. In general, since the collecting was confined to altitudes above 4500 feet, the results of this problem constitute a survey of some of the highest forms of water mites of the United States.