Biology Commons^™

Physiology Of Ethylene Production, Use, And Reactions In Plants, R. C. Nelson

Journal of the Minnesota Academy of Science

No abstract provided.

Some Higher Fungi In The Vicinity Of Winona, Sister M. Sylvia

Journal of the Minnesota Academy of Science

No abstract provided.

The Effects Of X-Rays Upon The Roots Of Zea Mays, Bernard Louis Wolfe

Bachelors’ Theses

Since. the discovery of X-rays by Rontgen in 1895, the majority of published papers dealing with the influence of these rays on plant life have considered their general effects on physiological processes including rate of seed germination and growth, respiration, and movements. A large number of investigators have worked on the morphological and cytological aspects while comparatively few workers have been interested in the histological effects of the stimulated tissues. The purpose of this thesis is to show the histological, morphological, and cytological effects of X-rays upon the root tips or the Zea Mays as well as the effects these …

Water Relations To Germination Of Zea Mays, Mary Hood

Masters Theses & Specialist Projects

Four experiments regarding water relations to germination of zea mays.

1. Per cent of water absorbed by seeds of zea mays with supply of water controlled and filter paper used as water absorbent.
2. Per cent of water absorbed by seeds of zea mays with supply of water controlled and filter paper used as water absorbent.
3. Per cent of water absorbed by seeds of zea mays with supply of water controlled and cotton used as water absorbent.
4. Per cent of water absorbed by seeds of zea mays with supply of water controlled and cotton used as water absorbent.

Seasonal Variation Of The Pigment Content Of Acer Saccharum & Tilia Americana, James Major

Masters Theses & Specialist Projects

Leaves of the sugar maple and the American linden were selected. Since it was impossible to control environmental factors in any way, trees growing in close proximity were used. A sugar maple and an American linden growing near the entrance to the circular drive between Ogden Hall and Snell Hall on the campus of Western Kentucky State Teachers College, Bowling Green, Kentucky, fulfilled the above conditions.

Types Of Vascular Arrangement In Some Homosporous Leptosporangiate Ferns, Grace Ann Kreuz

Bachelors’ Theses

The vascular structure of Leptosporangiate and Eusporangiate ferns has been studied by a number of Botanists.

The Phaenogams Of Western Kentucky University State Teachers College, Gertrude Raymond

Masters Theses & Specialist Projects

The campus of Western Kentucky State Teachers College was laid out in 1910 by Mr. Henry Wright, landscape architect, with the view of planting ornamental shrubs and woody and herbaceous plants indigenous to Kentucky. In more recent years the gardens on the grounds of the Kentucky Building have been planted with many species of Kentucky plants.

This study was undertaken for the purpose of making a scientific classification of the flowering plants on the campus of Western Kentucky State Teachers College.

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 …

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 …

Filicales Of The Mammoth Cave Region, William Youmans

Masters Theses & Specialist Projects

The purpose of this investigation was to determine the distribution of each species of ferns with regard to the geologic strata, altitude and temperature and moisture relationships. A systematic classification was made of all species of ferns found in the region.

The Relation Of The Native Forest Cover To The Physical And Chemical Nature Of The Soils Of The Mammoth Cave National Park Area, Sheppard Walker

Masters Theses & Specialist Projects

This study was undertaken for the purpose of determining the relation existing between the native forest cover and the chemical and physical properties of the soils of the Mammoth Cave National Park area. The study was suggested by certain references in the literature to a correlation existing between forest cover and the geological, chemical and physical nature of soils of this area. The recent attempt at reforestation in the Mammoth Cave National Park area renders such a study timely, and it is believed that the results reported in this paper will materially aid the Mammoth Cave National Park Commission and …

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 Ethnobotany Of The Acoma And Laguna Indians, George R. Swank

Biology ETDs

The Indian lives close to nature and utilizes the plants which grow about him, and these uses differ among various tribes. In order therefore to understand the ethnobotany of any group of Indians it is necessary to know something of their history, customs, mythology, religion and medicine. Hence in treating the ethnobotany of the Acoma and Laguna Indians the above phases of their culture will be discussed as they relate to these two pueblos.

The Development Of The Gametophyte And The Apogamous Sporophyte Of Pteris Quadriaurita, Var. Argyraea, Moore, Anno Mary Sendik

Bachelors’ Theses

In 1.848 Leszczyc-Suminski reported the appearance of sporophyte tissue element in a fern gametophyte. He observed tracheids near the apical notch of a prothallium of Pteris sulcata L. Wigand (1849) described an outgrowth from the apical notch of a fern prothallium. This was no doubt the development of an apogamous embryo. However, due to the uncertainty regarding the purity of some of his cultures, this development cannot be referred to any particular fern.

Studies In The Vascular Anatomy Of Picea Excelsa, Link, Mary Paul Mcwilliams

Bachelors’ Theses

Picea excelsa, Link is a native of middle and southern Europe, it has been transplanted to all cool climates, it is found plentiful in western North America, and thrives best in rural districts, away from the smoke and gas of the city.

The Structure Of The Seed And The Development Of The Seedling Of Symplocarpus Foetidus (L.) Nutt,, John P. Ranzau

Bachelors’ Theses

The first mention of Symplocarpus foetidus (L.) Nutt. is made by John Josselyn in his ''New England rarities discovered in birds, beasts. fishes, serpents and plants of that country" published in 1872, where it is listed with plants such as are "proper to the country and have no name." The subject of his description can readily be discovered from a crudely engraved illustration. "The whole plant scents as strong as a fox" certainly leaves no doubt as to the identity of the plant. The plant has for a long time been of unusual interest to both layman and botanist because …

Branched Cells Of Pteris Cretica L., Var. "Albo-Lineata, Hort And Pellaea Viridis (Forksk) Prantl", Mary Elizabeth Trechter

Bachelors’ Theses

The fern gametophyte offers a large field for experimental work, not only in the reproductive processes but in the development of prothallia from the germination of the spore. The ordinary fern spore germinates on soil or in water. Prothallia, which have formed branched cells, have been found by a number of workers, and attempts have been made by some to explain the cause of the branching.

Further Studies In The Ecotone Between Prairie And Woodland, R. J. Pool, J. E. Weaver, F. C. Jean

University Studies (University of Nebraska) (1888–1984)

A series of intensive investigations of the ecological features of the tension zone between prairie and woodland in the Mississippi valley was begun by Weaver and Thiel in 1915. These studies were continued for two seasons in Minnesota and were also extended to the prairies of eastern Nebraska in 1916. These investigations represent the first attempt to attack the prairie-forest problem on a comprehensive scale by means of the quantitative methods of modern ecology. Some of the results secured from these studies have been published as the first paper of a series planned to deal with critical investigations in the …

Rocky Mountain Flowers, Frederic E. Clements, Edith Schwartz Clements

School of Biological Sciences: Faculty Publications

AN ILLUSTRATED GUIDE FOR PLANT-LOVERS AND PLANT-USERS WITH TWENTY-FIVE PLATES IN COLOR AND TWENTY-TWO PLATES IN BLACK AND WHITE

The present book is an endeavor to present the materials of the Rocky Mountain flora in preliminary form from the standpoint of the experimental ecologist. The latter is concerned primarily with the relationships of "species" and their subdivisions as an organic expression or measure of habitat differences, and of the competitive relations of the various formations. Whatever the taxonomic value of the numerous segregates of the last decade or two, the fact that the binomial form conceals the relationship to the …

The Relation Of Leaf Structure To Physical Factors, Edith Schwartz Clements

School of Biological Sciences: Faculty Publications

The leaf, as the seat of important physiological functions of the plant, and because of its modification by external factors, has long been a fruitful subject for investigation. As a rule, however, investigators have confined themselves solely to the histology and morphology of the leaf, independent of its relations to physical factors. Where the latter have been considered at all, it has been in a more or less general way, or undue importance has been assigned to one or another of the physical factors, and others have been ignored entirely. In no case have they been carefully measured. The aim …

The Grasses Of Nebraska, Charles E. Bessey, Robert Bolin , Depositor

School of Biological Sciences: Faculty Publications

Dr Bessey was the Nebraska State Botanist and Professor of Botany at University of Nebraska. This report contains a classification list of grasses found in the state and brief comments on the usefulness of the various grasses.

The Distribution Of The Native Forest Trees Of Nebraska, Charles E. Bessey, Robert Bolin , Depositor

School of Biological Sciences: Faculty Publications

This document lists 67 trees identified by Dr Bessey with the help of others around the state. It includes the common and scientific names as well brief comment about each tree. Small maps are provided showing the distribution of each tree.

A Second Report Upon The Native Trees And Shrubs Of Nebraska, Charles E. Bessey, Robert Bolin , Depositor

School of Biological Sciences: Faculty Publications

Dr. Bessey was then Nebraska State Botanist and “Professor of Botany, State University, Lincoln Nebraska.” The State University is now called that University of Nebraska–Lincoln. This document was published as a contribution to the knowledge of the native woody plants of the state. Several reports had been published previously each containing additions and corrections. This report contains a “Special Request” that asked readers around the state to send samples of native trees and shrubs to the author.

The report contains a classification list of the various trees and shrubs along with information about where they can be found. A table …