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Observations On The Morphology, Physiology, And Life History Of Allescheria Boydii Shear, Robert Denton Flory

Master's Theses

Of those organisms upon the face of the earth displaying a wide range of variability, excellent examples may be found amoung certain groups of the fungi. This extreme variation as noted in certain fungal groups becomes even more interesting when the phenomenon of sexuality is eliminated or of rare occur­rence as in many of the Fungi Imperfecti. Such extreme varia­tions occur in Allescheria Boydii, whose historical background is as interesting as the growth of the fungus itself.

In 1909 Tarozzi (46)isolated a fungus organism as the causative agent in a Sardinian case of mycetoma. Tarozzi referred this fungus to Saccardo, …

The Comparative Osteology Of The Trunk Skeleton Of Five Year Classes Of The Golden Shiner, Notemigonus Crysoleucas (Mitchell), Aaron Hathaway O'Bier

Master's Theses

The golden shiner, Notemigonus crysoleucaa, forms a monotypic species in the fish family, Cyprinidae. It is a medium-sized minnow which inhabits ponds and sluggish freshwater streams in North America from latitude; 30°N. to 50°N. In the south its range is restricted to the area east of the Appalachian Mountains. The northern and western part of the range extends to Wyoming and south to the drainages of the Arkansas and upper Ohio Rivers.

The Distribution And Ecology Of The Terrestrial Shell-Bearing Mollusca Of Hanover, Henrico, And Chesterfield Counties, Virginia, John Bayard Burch

Master's Theses

Very little has been published concerning the molluscan fauna of Virginia, this being also true for the area under consideration. A preliminary list of the Mollusca of Hanover County was published by J.B.Burch (1952) in which twenty-five species and subspecies of land snails were reported. Several of the land Mollusca of Henrico and Chesterfield Counties were listed by P.R. Burch (1950). These included the snails Discus patulus Deshayes, Haplotrema concavum (Say), Mesodon thyroidus (Say), Stenotrema hirsutum (Say), Triodopsis Fallax (Say), and Ventridens = (zonitoides) arboreus (Say). Two additional species, Helicodiscus parallelus (Say) and Retinella indentata (Say), were reported by personal …

The Bacterial Flora Of The Alimentary Canal Of Passalus Cornutus Fabricius, George Taylor Tunstall

Master's Theses

The author has carried out an investigation of the bacterial flora of the alimentary canal of twenty-five specimens of Passalus Cornutus Fabricius between February and August and has described the species of organisms encountered. One hundred and eighty-two organisms were identified. Five families, six genera, and sixteen species were represented. Family Enterobacteriaceae is represented by: Escherichia freundii (Braak), Escherichia intermedium (Werkman and Gillen), Erwinia nimipressularis (Carter), Erwinia passali (sp. nov.), Erwinia intests (sp. nov.), and Erwinia virginia (sp. nov.). Only Bacterium passali (sp. nov.) is found in Family Bacteriaceae. Family Achromobacteriaceae is represented by Achromobacter passali (sp. nov.). Family Bacillaceae …

Studies On The Reactivating Sclerotium Of Physarella Oblong Morgan With Special Reference To The Nucleus, William Thomas Allman

Master's Theses

The Myxomycetes, because of their naked, mobile mass of protoplasm have served biologists and chemists as material for the study of the char­acteristics of protoplasm. The typical life his­ tory of such an organism may be summarized as follows: The vegetative phase in the life history consists of a naked mass of protoplasm, to which Oienkowski (9) applied the name "plasmodium". This plasmodium creeps by reversible streaming over and throughout the substratum, deriving its food from various constituents of decaying vegetable matter which serve as its normal substrate. Upon reaching a state of maturity and under certain environmental conditions, the …

Salmonella And Paracolon Species Isolated From The Wild Brown Rat, Rattus Norvegicus, In The City Of Richmond, Virginia, John Miles Sharpley

Master's Theses

The importance of bacteria as a cause of serious intestinal diseases in man and. other animals has been recognized since the early days of the science of bacteriology. Of those forms usually associated with intestinal disturbances in man, the species considered most important are those belonging in the Salmonella group, the Paracolon group, and the Shigella group. Also, it has been known since the early part of this century that the conman rat serves as an important vector for the dissemination of infectious organisms. For example, standard textbooks list rats as primary vectors of enteric bacteria. However. there has been …

A Study Of The Effects Of Some Chemical And Physical Factors On Plankton In An Artificial Lake, Archie Garnett Smither

Master's Theses

It has been well established that chemical and physical factors exert a marked effect upon the plankton population in bodies of water. However, the literature reveals the fact that the same chemical and physical factors not only produce a different effect upon plankton in different bodies of water, but are not consistent in their effects upon plankton in like bodies of water. For example, Birge and Juday (1911) made a study of 150 lakes, not widely separated in distance or varying in topographic conditions. These lakes were also of the same age, yet all were individual as to the amount …

Scientific Illustration, Alys Leontine D'Avesne

Master's Theses

It may be somewhat difficult at first glance to understand the essential character of the relationship of art to science, and especially to the natural sciences. Without illustration it would be impossible either to learn or to teach these sciences . Drawings are needed in the classroom and in the laboratory to aid the teacher, and they are perhaps even more important in individual research where there is no teacher present to guide and to instruct the student .

Scientific illustration is not only an aid to teaching, it teaches by itself when properly executed. In cases where verbal description …

The Morphology And Histology Of The Virginia Oyster, Ostrea Virginica, Lister, Lewis Charles Goldstein

Master's Theses

The oyster has been known and used commercially since before the Roman and Greek civilizations, and reports of investigations pertaining to it can be found dating back almost to that period. Because of the commercial value of the oyster, most of the study of' the animal has dealt with its economic importance. Definite information concern­ ing the morphology and microscopic . structure of this Mollusc, therefore, is scarce. To be sure, there is an abundance of miscellaneous literature, but no systematic microscopic study has been reported. T. C . Nelson (1938) states, "A critical survey of the abundant and scattered …

Gramineae, Vicinity Of Richmond, Virginia, Mary Smith Lynn

Master's Theses

List of grasses documented in the vicinity of RIchmond, Virginia.