Biology Commons^™

The Nature And The Development Of Starch Grains In Seed Plants, Slyvester John Siudzinski Jr.

Bachelors’ Theses

In spite of the importance of the starch grain from many points of view little work has been done on its nature and development. This fact is interesting since the nature and the development of the starch grain claimed a large share of the attention of the early workers. They observed and described the starch grains from the earliest days of the compound microscope. It was then observed that starch from the different plants showed in many cases marked differences with regard to size, shape and structural markings of the individual grains.

The Weather Effect On The Characteristic Protein Values In Wheat, Mary Margaret Murphy

Bachelors’ Theses

Scientific investigation has proved conclusively that the protein content of the wheat kernel is the most important factor in determining the quality of the flour obtained. A high protein wheat is used for flour for bread making, and a low protein wheat for pastry flours. The quality of the protein must be determined by baking experimental loaves.

The year 1934 was a year of drought. In all parts of the country the wheat crops were affected by the lack of rainfall; hence, the protein value of the wheat must necessarily have been affected in some manner. The United States Department …

The Circulatory System In The Extremities Of The Domestic Cat From A Gross Anatomical Standpoint, Harold Liebenstein

Bachelors’ Theses

The mammalian circulatory system serves the prime purpose of furnishing the body with food to carry on its functions. The domestic cat is closely related anatomically and physiologically to the human being, which makes it an excellent animal for laboratory work or experimental purposes.

A Determination Of Nicotine In Tobacco, Raymond L. Boelter

Bachelors’ Theses

Nicotine or nicotin, named from Jean Nioot who introduced the tobacco plant into France in 1565 is the characteristic alkoloid of the tobacco plant, Nicotiana tobacum, in all parts of which it occurs to the extent of from six tenths of one per cent, to four and eight tenths per cent.

The Inheritance Of Some Human Traits, Robert H. Crawford

Bachelors’ Theses

Although the proper collection and observation of necessary data with reference to the application of Mendel's laws of heredity to man has been brief, it has disclosed evidence significant enough to make it appear highly probable that many of the characters in man follow these laws as well as do the traits of lower animals.

The object of this thesis was to determine whether or not certain human traits were inherited, the mode of their transmission from parent to offspring, and, if possible, the establishment of any proof of linkage in the human line.

Muscles Of The Forelimb And Pectoral Girdle Of The Spiny Soft-Shelled Turtle, Amyda Spinifera, Joseph Volk

Bachelors’ Theses

The order Chelonla Is characterized by an exo-skeleton formed by a somewhat cupshaped, oval carapace on the dorsal surface and a roughly rectangular, flat plastron on the ventral surface, which are united at their lateral edges, between the fore and hind limbs by structures of similar composition, the bridges.

Studies In The Development Of Tissue In Helianthus Annuus, L., Theodore Riedeburg

Bachelors’ Theses

The common sunflower, Helianthus annuus, L. is a member of the Compositae and a native of the Great Plains region of the United States. It is an annual herb, with a rough hairy stem three to fifteen feet high, broad, coarsely toothed rough heartshaped leaves three to twelve inches long and heads of flowers three to six inches wide in wild specimens and often one foot or more in cultivated plants. The plant is economically important, for its leaves are used as fodder, the flowers yield a yellow dye, and the seeds contain oil and are used for food. …

Nuclear And Cell Division In The Root Tip Of Iris Versicolor, Mary Maxentia Mahoney

Bachelors’ Theses

The writer found that very little work has been done on the somatic mitosis of Iris versicolor L. Some interesting accounts of karyokinesis in the root tips of some monocots have been written. Schaffner (1898) made a detailed study of nuclear and cell division in the root tips of the Allium cepa. He observed that the spindle originated from centrospheres, and that the most typical resting nuclei occured some distance back of the tip beyond the actively dividing region. In good stained material the resting nuclei had one or two large nucleoli and a very distinct chromatin net …

Observations On The Gross Anatomy Of The Venous System Of Adult Chelonia, James S. Kain

Bachelors’ Theses

The turtle is a reptile belonging to the order Chelonia. Because it is so very abundant and its size so convenient it has been much used for class work and to a certain extent has been studied rather thoroughly by private workers. Each one, however, stressing his or her own particular point of interest especially, the turtle is attractive to students of Comparative Anatomy because of the fact that it has retained more of the primitive characteristics of the ancestral form from which the mammals are descended than any other readily available reptile.

Studies On The Anatomy Of The Arterial System Of The Turtle, Sylvester J. Schroeder

Bachelors’ Theses

Turtles are reptiles in which the body is wide and short, and is enclosed in a shell composed of a dorsal shield, the carapace, and a ventral shield the plastron. The shell of three of the species is composed of large external, epidermal, horny plates. These latter consist, in the carapace, of the flattened ribs and the flattened trunk vertebrae which coalesce with overlying dermal bony plates, and are surrounded on the circumference of the shell by a series of marginal dermal bony plates; in the plastron they consist of exclusively dermal plates, there being no sternum. The carapace and …

Contributions To The Anatomy And Physiology Of The Heart In The Turtle, David J. Twohig

Bachelors’ Theses

The heart in any animal, and especially in higher animals, is an important organ. It is the purpose of this paper to consider such an organ from the anatomical and physiological basis as it exists in the turtle.

The turtle was chosen as the subject for many reasons. The first one of these reasons was because the heart of the turtle closely.resembles the most complex of hearts in structure and action. The second was because the heart is quite typical of the members of Class Reptilia. The third reason was because the speciments are readily obtainable.

Contributions To The Anatomy Of The Aortic Arches Of The Acanthias Vulgaris, Wendell Corwin

Bachelors’ Theses

The spiny dogfish is a small shark that averages about two feet in length and three pounds in weight. It is called spiny because of the presence of a prominent spine on the boarder of each dorsal fin. The species has a wide distribution in the North Atlantic, occurring plentifully on the American and European shores, as well as in the Mediterranean Sea. The fish swim in enormous schools and are constantly in motion. The dogfish has no economic importance but is universally used for dissection in the zoological laboratory.

The Native And Cultivated Gymnospersm Of Eastern Wisconsin, Mary Stapleton

Bachelors’ Theses

Since the late years of the nineteenth century, botanists have grouped all seed-bearing plants into two main divisions, those with no seed cases, that is with naked seeds, end those the seeds of which are enclosed in a husk, pod, or other covering. The former are Gymnosperms; the latter Angiosperms.

Study Of The Tissues And Tissue Development In The Leaf And Stem Of Lycium Halifmifolium, L., Charles A. Troxel

Bachelors’ Theses

The Matrimony-vines are shrubs with usually spiny branches, rigid in some species, slender and arching or procumbent in others, with small and rather narrow, usually grayish green leaves, and dull-colored whitish, purplish, or violet flowers and scarlet, rarely yellow or black, berries. Most of the species are tender but Lycium halimlfollum, L. chinense, and also Lycium turcomanicum and L. ruthenlcum are hardy and thrive in the north temperate regions.

The Effect Of Theelin Upon The Growth And Development Of The Genital Tracts Of The Female White Rat, Robert H. Grogan

Bachelors’ Theses

This paper has been designed to meet the requirements of a bachelor's thesis. The main substance of the thesis is a reiteration of some of the work done by other men in the field of ovarian hormones with some original work on the part of the author. I have endeavored to prove that theelin controls, to some extent at least, the development of the genital tracts of female white rats. Especial care was taken to follow out in detail the methods used by Doisy and his associates in similar experiments so that I would have a criterion by which to …

A Morphological Study Of Daphniidae, Stanley E. Zawodny

Bachelors’ Theses

Th importance of fresh-water organisms is usually underestimated, especially by the very people who live near bodies of fresh-water and who thus can observe such organisms throughout the year. It is really easier to study minute life forms than it is to study larger organisms, for the former can be examined under all kinds of conditions as experiments are performed upon them. The purpose of this thesis is to give a short survey of the chief type among the fresh-water, Crustaceans, with special reference to morphology.

Heredity In Twinning, Dolores M. Kauffung

Bachelors’ Theses

Identical twins have been tn basis for a large amount of the evidence produced by scientists in upholding the contention that heredity is stronger and more important than environment.

It has been the purpose of this paper and the intention oi' the author to develop this theory and to attempt to discover how far heredity really affects the individual and. to what extent it may be influenced by environment.

Parasitology: With Special Reference To The Frog, Leo M. Boxer

Bachelors’ Theses

Prior to the middle of the sixteenth century the knowledge of parasites, their habits, life-histories and forms as limited to a few external parasites and a few parasitic worms. Previous to the discovery of, and knowledge gained by, the study of microscopic parasites, and the effects produced by them, nearly all diseases were thought of as some sort of punishment for sins committed.

An Introductory Study Of Correlations Existing Between The Weight Of Organs And The Length, Width, And Thickness In Pig Fetuses Of The Same Litter, Michael T. Crowley

Bachelors’ Theses

No studies seem to have been performed on pig fetuses, of the same litter, to determine correlations existing between the weight of organs and other types of measurements of the same organs.

Contributions To The Anatomy Of The Mature Larva Of Papilio Polyxenes Fab. (Lepidoptera: Papilionidae), Ernst J. Dornfeld

Bachelors’ Theses

Thia study was undertaken with the purpose of gathering more comprehensive information on the larval anatomy of a typical member of the lepidopterous family Papilionidae. Except for investigations dealing with the osmeteria, literature on the general anatomy of this otherwise well known family is very scant. Because of the relatively small number of speci­mens that were available for study, this paper has been limi­ted to a discussion of the external anatomy and of the gross . morphology of the digestive tract, the urinary system, the silk glands, and the mandibular glands. Important papers in which these structures have been …

Sporogenesis In Riccia Natans L., Mary Fortunata

Bachelors’ Theses

Until comparatively recent years little, comprehensive Cytological work had been done on the lower forms of plant life including the Liverworts. Cavers (1903) stated that Micheli in 1729 named a species "Hepaticae fontana" because of the supposed resemblance between the branched thallus and the lobes of the liver, and although this species was later named "Fegatella conica", the name "Hepaticae" has, since then, been applied to the whole group of Liverworts. Between 1850 and 1862 Hofmeister demonstrated "Alternation of Generations" in this group, and it was this characteristic that distin­guished them permanently …

A Study Of Some Species Of Pediastrum And Scenedesmus, Irene Cull

Bachelors’ Theses

Although regarded by the untrained observer as slime, filth and scum, algae are fascinating to the botanist who has become interested in them. Algae are found everywhere; they are our commonest water plants. Among the green algae we have some of the most beautiful and fascinating forms in the plant kingdom and undoubtedly Pediastrum and Scenedesmus, the two genera studied, are among the most beautiful of all.

Values To Be Derived From A Study Of Biology, Florence J. Kane

Bachelors’ Theses

My problem was to discover what scientists, educators, and people interested in the teaching of biology considered the most important values to be derived from a, study of this subject.

The Pituitary, Thyroid, And Adrenal Glands Of The Opossum, Max F. Drozewski

Bachelors’ Theses

In recent years a great deal has been written on the endocrine glands. However most of the articles deal with the physiological function of the various ductless glands only. Very little of this literature deals with the anatomical structure of the organs themselves. In this thesis we shall discuss the anatomical structure of the endocrine glands namely, the Pituitary(hypophysis), Thyroid and the Adrenal of a marsupial. The work has been done on the opossum of the virginia species, Didelphis virginiana. Only two specimens were available for dissection.

The Spleen Histology And Differences In Functions, John Shakula

Bachelors’ Theses

In delving into the literature concerning the Spleen one is greatly surprised to find so much diversity of opinion concerning its origin, histology and functions.

The Endocrine Glands And Their Secretions, Eldred M. Moehrke

Bachelors’ Theses

In the following work the endocrine system was considered in general with special emphasis on the thyroid and para-thyroid glands. In some manner,which we do not well understand,the thyroid and the para-thyroid glands affect the other ductless glands and it is this relationship that is stressed.

General Morphology And Physiology Of The Urogenital System Of The Opossum, Robert Schuster

Bachelors’ Theses

From the very first, I wish the state that the title, "General Morphology and Physiology of the Urogenital System of the Opossum," is not entirely descriptive of the text which is to follow. However it is as nearly descriptive as I could hope to make it.

It seems that during the history of biological research the workers have done comparatively little work on the Opossum. This neglect was probably due to its inaccessibility, since it is found only in Australia and in the semitropic regions of North America. In the nineteenth century the eminent authority on anatomy, Sir Richard Owen, …

The Development Of The Archegonium Of Marchantia PolymorphumL., Mary Virginia Braukman

Bachelors’ Theses

Marchantia polymorphum L. grows commonly under moist conditions, in ravines or along the sides of ditches, banks of streams, and in other similar places. It can be found in what appear to be quite dry situations, though it is more nearly correct to state that it can exist through more or less prolonged dry periods. It grows actively only when conditions are comparatively moist. Marchantia reaches its best development on damp burnt-over wooded places. Marchantia polymorphum L. appears as a flat dichotomously branched thallus, closely pressed to the substratum on which it grows. The thallus is selt-supporting, possessing chlorophyll, and …

How Far Is The Argument Of Homology Acceptable To Reason, Wilmur Daniel Ackerman

Bachelors’ Theses

Evolution is a subject that involves a great deal more than the average person really thinks about. To approach subject like this, one must try to obtain as many of the different factors that taken into consideration as is possible.

The Spleen Considered With Special Reference To Its Functions, Louis J. Schmidt

Bachelors’ Theses

In arranging this thesis an attempt has been made to show that by virtue of its embryology, anatomy and histology, the spleen is the better enabled to carry out its alleged functions. The discussion here presented is confined to a story of the functions of the mammalian spleen alone. The similarities in the reactions of the spleen in the various mammalia is quite evident. Experimentation and observations were carried out on the lower mammalia while only the reactions of the splenectomized humans could be observed.