Life Sciences Commons^™

The Effect Of Neurosecretions From The Cerebral Ganglia On Blood Glucose Levels In Lumbricus Terrestris, Joan Vanderpol Craig

Masters Theses

Introduction

The presence of neurosecretory cells in the suprapharyngeal ganglia of Lumbricus terrestris has been well established (B. and E. Scharrer, 1937). Since these cells may well be the only source of hormones in this organism (B. Scharrer, 1959), the question arises as to their role in the animal's regulation of metabolism The particular aspect of this problem investigated here concerns the effect of these neurosecretory substances on the blood glucose levels in L. terrestris.

Preliminary studies by this investigator on glucose levels in earthworms revealed that blood samples of approximately 15 microliters could be obtained from each animal and …

The Effects Of Estrogenic And Gonadotrophic Hormones On Normal Levels Of Some Blood Chemical Constituents In The Non-Breeding Female Mallard Duck, Wendell F. Hofman

Masters Theses

Introduction

In past years, a substantial amount of research has centered on the levels of certain blood chemical constituents in birds, particularly in chickens and pigeons. However, little has been recorded concerning the blood chemical constituents of the mallard duck, Anas platyrhynshos. Likewise, the effects of hormones on its blood chemistry, in conjunction with its reproductive system, have been almost totally unexplored. Therefore, this study, conducted from October 14, 1965, to March 3, 1966, had as its purpose the determination of normal quantitative levels of certain blood chemical constituents (the electrolytes--calcium, sodium, potassium; the proteins--albumin and globulin; and lipids) and …

A Comparative Approach Into The Differentiation Of Two Strains Of Staphylococci, Walter D. Hosksema

Masters Theses

Introduction

The purpose of this investigation was to differentiate Staphylococcus aureus phage type 42D from Staphylococcus epidermidis.

The investigation involved four approaches to this differentiation. The first was a selective screening technique on specific media to point out physical and biochemical characteristics and to demonstrate the presence of specific enzymes. The second was a drug survey which was used to show basic susceptibility and resistance to ten different antibiotics. The third was ultra-violet irradiation which was used to discern susceptibility and resistance to the soft rays of this spectrum segment. The fourth was a chromatographic procedure using labeled carbon which …

Studies On The Effects Of Commercial Detergents On Cucumber And Barley, Marylu Elizabeth Mudd

Masters Theses

Introduction

The fact that large quantities of detergents daily are being added to our water table and the appearance of billows of foam at the shores of many inland bodies of water have caused alarm among biologists and sanitation engineers. However, few observations of the effects of synthetic detergents on living organisms other than bacteria have been recorded.

The purpose of these studies was (1) to determine the effects of several commercial non-biodegradable detergents, Tide, Dreft, and Alconox, and one biodegradable detergent, Living, upon the germination and root elongation of seeds of a monocotyledon, barley (Hordeum vulgare L.) and a …

Sexual Receptivity And Fertility Of Androgen Induced Persistent Estrous Rats, Norman Donald Diebel

Masters Theses

The effect of neonatally administered testosterone propionate (TP) on sexual receptivity and fertility was studied. Dosages of 25 μg and ten μg were used and were administered s.c. in peanut oil on the fifth day of life. Vaginal smears of the animals receiving 25 μg were begun at the age of 61 days and indicated that these animals exhibited modified estrous cycles. By 90 days of age, most of the animals in both dosage groups were in constant vaginal estrus. These prolonged periods of vaginal estrus were often interrupted only by mating.

At 97 days of age 40 females which …