Digital Commons Network^™

An Investigation Of Infection Mechanisms Of Arceuthobium Campylopodum, Annabella Jaramillo Garcia

Dissertations and Theses

Wound periderm is formed by Juniperus occidentalis and Calocedrus decurrens in resistance to infection by the dwarf mistletoe Arceuthobium campylopodum. The pattern of wound periderm formation suggests that chemical as well as mechanical factors are involved. The concentration of hydrolases in the radicular apex of the parasite suggests that they may facilitate the penetration process by which dwarf mistletoes infect their hosts. Emzymatic assistance may also provide a partial explanation for the specificity with which dwarf mistletoes are adapted to given hosts. These resistance responses by the the non-host species were compared with the normal infection process Pinus ponderosa …

Venezuelan Macronyssidae (Acarina:Mesostigmata), Robert C. Saunders

Theses and Dissertations

A total of over 5000 mite specimens representing 49 species was studied and evaluated. The most frequently encountered species was Ornithonyssus bacoti. Based on these specimens, a brief review of the family Macronyssidae in Venezuela is presented. Included are brief notes as to medical importance and host relationships; also a key to the genera of Venezuelan Macronyssidae and a host-parasite list are included. Reprints of two papers and the manuscript of a third are included as part of the dissertation requirements. Contained in these are descriptions of three new genera (Argitis, Lepidodorsum, and Nycteronyssus) and four new species (Acanthonyssus proechimys, …

A New Species Of Lesser Antillean Typhlops (Serpentes: Typhlopidae), Richard Thomas

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

Generic Status Of Opheodrys Mayae, A Colubrid Snake Endemic To The Yucatan Peninsula, Douglas A. Rossman, Gerald C. Shaefer

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

Infection Of Smallmouth Bass And Goldfish By Two Species Of Saprolegnia, Cheryl A. Mcginley

Dissertations and Theses

This study consisted of several experiments designed to compare the ability of two species of fungi, Saprolegnia ferax and S. parasitica to grow on two species of fish, smallmouth bass (Micropterus dolomieui) and goldfish (Carassius auratus), and to determine the criteria necessary for the development of these infections.

The results indicate that water in the fish tanks must be slightly acid (pH 6), warm (22°C), nonmoving, and that the fish must be wounded in order for fungal infection to occur. Cool water (18°C) and moving water, caused by aeration and filtration, are detrimental to fungal colony …

Effects Of The Nerve During The Dedifferentiative Phase Of Limb Regeneration In The Mexican Axolotl, Ambystoma Mexicanum, Roberta Gail Wald

Dissertations and Theses

It is known that nerves are particularly critical during the early or dedifferentiative phase of limb regeneration. During this period in the innervated limb, cells just proximal to the amputation surface dedifferentiate, migrate to the limb tip, and undergo mitosis. These processes give rise to a population of undifferentiated mesenchymatous cells capable of redifferentiating into the missing components of the newly forming regenerate. The consequences of denervation stand in stark contrast to the normal events occurring in the innervated limb, because neither a blastema nor a regenerate forms.

Results from this study indicate that during the early portion of the …

Isolation Of Hypoxanthine-Guanine Phosphoribosyl Transferase Deficient Mutants In A Mammalian Cell Line, Winston M. Sanford

Biology ETDs

The isolation of hypoxanthine-guanine phosphoribosyl transferase deficient mutants of Swiss mouse fibroblast cells was accomplished by exposure of large numbers of normal cells to the toxic antimetabolic agent 8-Azaguanine. Cell lines resistant to 0.1, 0.5 and 1.0 μg/ml of 8-Azaguanine were obtained. Enzyme studies of these cell lines revealed an inverse correlation between the level of resistance to 8-Azaguanine and the activity of the hypoxanthine-guanine phosphoribosyl transferase enzyme. One exceptional mutant has been isolated with a resistance to 8-Azaguanine and an enzyme activity two-fold higher than the parent cell. These mutants are discussed in terms of genetic and biochemical defects …

Human Sperm Antigens And Antisperm Antibodies, Carol K. Dudley

Biology ETDs

An immune response to spermatozoa may result in the production of autoantibodies to sperm. Most studies of antisperm antibody have depended on sperm agglutination or sperm immobilization which only detect antibodies reacting with cell surface antigen. In the study reported here indirect immunofluorescence was used to examine antisperm antibodies to all components of sperm in vasectomized males. These antibodies were used to study the nature of sperm­specific antigens, located in subcellular regions of the human spermatozoa. The incidence of antisperm antibodies in vasectomized patients rises from 61% before surgery to 90% nine months after surgery. The antibodies present before surgery …

On The Effects Of Reduced Competition Between Species Of Eleutherodactylus., Kirkland Lee Jones

Biology ETDs

To elucidate the changes in the trophic and microhabitat portions of the niche under various degrees of competitive pressure, four species of Eleutherodactylus were studied on five Caribbean islands. Approximately 100 specimens of each species occurring on each island were collected. Five measurements were used to characterize the microhabitat at the collection site. Five morphological measurements were taken from each specimen. All stomach contents were measured, counted, and categorized. Feeding rates were obtained from stomach contents and direct observation.

Agonistic Behaviour In Gila Woodpeckers, Gene L. Brenowitz

Biology ETDs

Agonistic behaviour of Gila Woodpeckers (Centurus uropygialis), including vocalizations, visual displays and other related behaviours, is described. Aggressive interactions with both con- and hetero-specifics were analyzed by stochastic processes. Results indicate that Gila Woodpeckers are far less aggressive than qualitative descriptions suggest and reasons for this discrepancy are presented.

The ecological correlates of Gila Woodpecker aggression were investigated and it appears that most aggression is related to defense of areas both intraspecifically and interspecifically. The effects of the two types of territoriality on the distribution of the species involved were compared and found to be significantly different. A model is …

A Study Of The Enteric Bacterial Population Of The Rio Grande From Cochiti Dam To Bernalillo, New Mexico And Of The Water Systems Of Cochiti, Santo Domingo And San Felipe Villages, Linda K. Fogleman

Biology ETDs

A bacterial survey of fecal coliforms, fecal streptococci, Arizona and Salmonella was made of the waters of the Rio Grande, its adjoining canals and ditches, and of the well water of three pueblos along the Rio Grande in New Mexico. The river and ditch survey consisted of sampling 11 sites from Cochiti Bridge south to the Bernalillo Acequia at Bernalillo, and took place between September, 1971 and November, 1972. Water was collected from six sites in Cochiti Village, five sites in Santo Domingo Village, and seven sites from San Felipe Village between May 25, 1972 and November 14, 1972. Six …

Nutrient And Energy Composition Of Beef Cattle Feedlot Waste Fractions, C. B. Gilbertson, J. A. Nienaber, J. R. Ellis, T. M. Mccalla, T. J. Klopfenstein, S. D. Farlin

Nebraska Agricultural Experiment Station: Historical Research Bulletins

This bulletin describes nutrient and energy composition of beef cattle waste fractions as a function of the ration roughage level and type of feedlot. Results can be used to plan engineering system approaches and research to develop handling and processing equipment necessary for recovery of the most valuable portion of waste.

Influence Of Molecular Weights Of Bacteriophage Φ6 Double-Stranded Ribonucleic Acids On Interferon Induction, W.J. Kleinschmidt, James L. Van Etten, A. K. Vidaver

Department of Plant Pathology: Faculty Publications

The interferon-inducing capabilities of the three molecular segments of bacteriophage φ6 double-stranded ribonucleic acid increased with increasing molecular weight.

The Great Potato Debate, James D. Hudson

Honors Theses

Anencephaly and spina bifida cystica are two of the most common severe congenital malformations consistently observed in human populations. Both represent defects in the neural tube and share a significant number of similar epidemiological associations among them, occupational class, geography, sex ratio, maternal age, year and season of the year. In anencephaly most of the brain and upper skull never form usually resulting in death within a few hours of birth. Spina bifida cystica is a malformation of the spinal cord often causing paralysis, vulnerability to infection, and early death. In 1972, Dr. J.H. Renwick presented a controversial hypothesis which …

Microanatomical Studies Of Dentalium Pilsbryi Rehder, 1942 And D. Texasianum Philippi, 1848, Kenneth R. Bazata

Open Access Master's Theses (through 2010)

In the course of an investigation of the nature of the heart and kidney of Dentalium pilsbryi, the present author discovered an unexpected configuration of the anatomy of the digestive system. The present report represents an extension of this preliminary study and is the first detailed account of the digestive system in D. pilsbryi and D. texasianum. Comparative descriptions of the siphonal complex, the foot, and the histology of the anterior mantle also are given.

Advisor: Carl W. Gugler

Feeding And Food Preferences By Three Sympatric Species Of Cyprinodontid Fishes, Lawrence J. Baer

OES Theses and Dissertations

The feeding and food utilization by three sympatric species of cyprinodontid fishes was examined using a modified Ivlev Electivity Co-efficient. Results indicated that although Fundulus heteroalitus and Fundulus majalis are sympatric in the area examined,their usage of the available food source varied noticeably. The third investigated species, Cyprinodon variegatus, fed mainly upon a vegetal detritus food source varied by the consumption of invertebrate and vertebrate food items. Slight intra-specific variances of diet between crespuscular periods was also discussed.

Purification And Characterization Of Syringacin 4-A, A Bacteriocin From Pseudomonas Syringae 4-A, William L. Haag, Anne K. Vidaver

Department of Plant Pathology: Faculty Publications

Syringacin 4-A, a bacteriocin produced by Pseudomonas syrinagae 4-A, was obtained by induction with ultraviolet irradiation or mitomycin C. Approximately 1,000-fold purification of the bacteriocin was achieved by manganous chloride precipitation, differential centrifugation, and chromatography on hydroxyapatite columns. The purified syngacin was homogeneous on hydroxyapatite columns and sucrose density gradients; it also sedimented as a single entity in the analytical ultracentrifuge. The buoyant density of purified syringacin in cesium chloride was 1.294 g/ml. The sedimentation coefficient was calculated as 120S, and the diffusion coefficient was 6.49 x 10^-8 cm²/s. The molecular weight was calculated as …

88th Annual Report Of The Nebraska Agricultural Experiment Station

Agricultural Research Division: News and Annual Reports

Contents:
Foreword
Administration and Staff
Nebraska Agricultural Experiment Station
Research Projects
Experiment Station Publications
Publications of the Staff
Report of Income and Expenditures

Neotoma Alleni, Hugh H. Genoways, Elmer C. Birney

University of Nebraska State Museum: Mammalogy Papers

Neotoma alleni Merriam, 1892
Allen’s Woodrat.

Neotema alleni Merriam, 1892:168. Type locality Manzanillo, Colima.

Hodomys vetulus Merriam, 1894:236. Type locality Tehuacan, Puebla.

A Spectrographic Analysis Of Pinon Jay Vocalizations, Lyle Rae Berger

Biology ETDs

Vocalizations and behavior of banded pairs of adult Pinon Jays were recorded during 1972. Jays were housed in large outdoor aviaries. Fifteen distinct vocalizations were isolated in this study. During 1973 individual adult Pinon Jays were observed, and their vocal responses to other individuals were recorded under various circumstances in an attempt to quantify the functions of the calls iso­lated in the initial study. Six pairs of Pinon Jays were tested in this manner. A wild flock of unhanded Pinon Jays also was observed during 1972 and part of 1973.

The fifteen Pinon Jay vocalizations were examined with the aid …

Annual Report 1973-74 And Membership Directory, Iowa Academy Of Science

Iowa Academy of Science Documents

Contents:

Committee Membership 1973-74 ... 1-3
Report of the Executive Secretary ... 4
Minutes of the Annual Business Meeting ... 20
Report of the Treasurer ... 32
Report of the Annual Meeting Committee ... 34
Report of the Editor of the Proceedings ... 35
Report of the Editor of the Iowa Science Teachers Journal ... 36
Report of the Librarian ... 37
Report of the Finance Committee ... 38
Report of the Elections Committee ... 40
Report of the Membership Committee ... 42
Report of the Publications Committee ... 44
Report of the Recognition and Awards Committee ... 46
Report …

How Psychotherapy Heals, Jerome D. Frank

Henry Ford Hospital Medical Journal

This paper, accompanied by the discussions and the preceding introduction, was delivered May 9, 1974 as part of an anniversary celebration commemorating a half century of existence for the psychiatric unit at Henry Ford Hospital. Established in 1924 by the late Thomas J. Heldt, M.D., as a division of neuropsychiatry in the department of medicine, the unit is generally believed to be the first to be incorporated into a general hospital anywhere. It was - and is - conducted without physical restraints of any kind, without isolation of patients, and without segregation of men and women.

Department Emphasis Week Lectures, Al Mennega

Pro Rege

No abstract provided.

Biosystematics Of The Heermanni Subgroup A Of The Genus Dipodomys (Rodentia: Heteromyidae), Anthony G. Futcher

Loma Linda University Electronic Theses, Dissertations & Projects

This study investigates the taxonomic status of members of the heermanni subgroup of the genus Dipodomys.

Karyotypes were prepared for 12 populations of this subgroup, using in vivo cultures of bone marrow prepared by a modified colchicine-hypotonic citrate method. The 2n ranges from 52 - 72.

Electropherograms were prepared for 11 populations, and data derived from the tracings were subjected to stepwise discriminant function analysis, resulting in scattergrams which were used to indicate closeness of relationships between populations.

These data show that: a) Dipodomys stephensi (Merriam) and Dipodomys ingens (Merriam) are well defined species with 2n = 70 for D. …

Implications For Microtubule Mediated Ethylene Effects In Pea Stem Sections, David A. Steen

Loma Linda University Electronic Theses, Dissertations & Projects

The marked effects of ethylene on pea stem growth have been investigated. Low temperature mid colchicine. both known microtubule depolymerization agents, reverse the effects of ethylene in straight growth tests. Low temperature (6 C) also profoundly reduces the effects of the gas in terms of swelling, hook curvature, and horizontal nutation. Electron microscopy shows that microtubules are reoriented after treatment with ethylene for as little as 12 hours. The findings indicate that some of the ethylene responses may be due to a stabilizing effect on microtubules in plant cells.

Nocturnal Flights Of Triatoma (Hemiptera: Reduviidae) In Sabino Canyon, Arizona, David B. Ekkens

Loma Linda University Electronic Theses, Dissertations & Projects

Three species of Triatorna were studied in this investigation: T. rubida uhleri (Neiva), _T. protracta protracta (Uhler), and T. recurva (Stal) (Hemiptera:Reduviidae). These blood-sucking bugs are ectoparasites of vertebrate animals. Triatoma rubida uhleri (Neiva) is the most common conenose bug in southern Arizona.

At certain seasons of the year Triatoma bugs enter homes and bite people causing an allergic reaction in sensitized individuals. The purpose of this study was to determine cause of flight, time of day and r season of the year most individuals fly, effects of various physical factors on flights and distances flown.

This research was conducted …

Bone Regeneration Over Submerged Dental Roots In Dogs, Roger Lee Plata

Loma Linda University Electronic Theses, Dissertations & Projects

Nonendodontically treated roots were submerged 1.5 to 2.0 mm. below the alveolar crest in three dogs. Twelve roots were treated in this manner. Regeneration of alveolar bone can be seen in three weeks with complete bone coverage in five weeks. A complete lamina dura can be seen around the amputated roots.

Bone failed to regenerate over two of the twelve roots. In one case there was delayed healing due to the early loss of some sutures. A sinus tract developed connecting the oral environment with the contents of the pulp. This led to bone resorption and a necrotic pulp. In …

The Chromosomal Complement Of The Yellow-Cheeked Vole, Virginia R. Rausch, Robert L. Rausch

Harold W. Manter Laboratory of Parasitology: Faculty Publications

The karyotype of Microtus xanthognathus (Leach) is described, based on material from one female and one male vole. The diploid chromosomal number was found to be 54, and the fundamental number 62. The metacentric X-chromosome was of medium size and averaged 6.6% of the haploid complement. The designated Y-chromosome was near acrocentric. The specific distinction of M. xanthognathus and Microtus chrotorrhinus (Miller) was confirmed by the recognition of major differences in karyotype and differences in fundamental number. The distributional history of M. xanthognathus is briefly discussed.