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Effects Of Burning On Soil Algae In A Restored Tallgrass Prairie., Sandra Lou Kragskow

Student Work

Introduction: Algae are present in almost every soil throughout the world, with the Chlorophytes and Cyanophytes the most common (Bold, 1970). Algal abundance and diversity in any particular soil seems to be dependent on, and respond to, changes in light, moisture, pH, and nutrients and substrate (Shields and Durrell, 1964).

Salve Regina - The Newport College Appoints 15 New, Full-Time Faculty Members, Salve Regina University

Press Release Archive

No abstract provided.

Structure, Transcription And Evolution Of The Alu Family Of Interspersed Repetitive Dna Sequences, James Tilford Elder

Yale Medicine Thesis Digital Library

The cloning of DNA fragments derived from the (beta)-like globin gene cluster of normal and (beta)('+)-thalassemic individuals is described. These and other cloned human DNA fragments are employed to define the strucure and transcription of a family of interspersed, repetitive RNA polymerase III transcription units in human DNA. These data allow unequivocal identification of these transcription units with the Alu family of interspersed, repetitive DNA sequences. Comparison of these sequences to those of other primate and rodent interspersed repeats reveals that the primate sequence resembles in many respects a dimer of the rodent sequence. This striking interordinal divergence stands in …

A Revision Of The North American Species In The Genus Euodynerus (Hymenoptera: Eumenidae), Ali Shallan Moalif

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Twenty-eight species of Euodynerus Dalla Torre are recognized from the Nearctic Region, of which one is Holarctic. Literature on the biology of fourteen species is reviewed and new biological information discussed for four species. The phylogenetic relationships of the genus Euodynerus to other genera and the classification and relationships of the species of Euodynerus are discussed. Seven subgenera are recognized of which four are new: Euodynerus, Pareuodynerus Bluethgen, Leucodynerus Bohart, Annodynerus new subgenus, Gonodynerus n. subgenus, Holodynerus n. subgenus and Plecodynerus n. subgenus. Their comparative morphology, phylogeny, and distrubution are discussed. Larval instars of E. hidalgo (Saussure), E. scutellaris …

Somatic Cell Genetic And Molecular Analysis Of Dna-Mediated Gene Transfer, Kenneth Michael Huttner

Yale Medicine Thesis Digital Library

No abstract provided.

Annual Activities And Behavior Of A Grizzly Bear (Ursus Arctos) Family In Northern Alaska, James George Gebhard

Theses (Unassigned)

No abstract provided.

Morphological And Genetic Composition Of The Gonds Of Central India: A Statistical Study., Urmila Pingle Dr.

Doctoral Theses

The racial compositi on of the people of India 1s atill a riddle and one which isg etting increasingly difficult to eolve as over a period of time it han been fast chnnging due to absorption of mrious pepulntions into the Hindu onste- fold ant the finsion and funion within the casto syaten na n product of occupntionnl or cultural chnnge in the wny of life. Admixture over a long peri od of time bas produc ed a wide diversity in norphology (ns well as skin colour) ef Indinn people. The wavas of migrations of people from the Eu rasian …

The Effects Of Deafferentiation Of The Cerebellar Cortex In The Rat, William Athen Anderson

Digitized Theses

No abstract provided.

Characterization Of A Blood-Uterine Lumen Barrier In Rats, Ann Catherine Mcrae

Digitized Theses

Previous studies indicated that a permeability barrier between blood and the uterine lumen might exist in rats. The abilities of selected radiolabelled test substances to enter the uterine lumen were assessed by comparing radioactivity concentrations in fluid (secreted or instilled) recovered from the uterine lumen with those in serum, at fixed times after single intravenous injections of a test substance.;Initial experiments conducted in immature, ovariectomised, estradiol-treated rats revealed that a barrier to {lcub}('3)H{rcub}-sucrose, {lcub}('3)H{rcub}-inulin, and {lcub}('125)I{rcub}-bovine serum albumin exists between blood and the uterine lumen which impeded the entry of these substances into the uterine lumen. Further experiments showed that …

A Multivariate Study Of Geographic Variation In The Cones Of Pinus Contorta In Relation To Environmental Variables, Kenneth Winston Newman

Digitized Theses

A multivariate analysis was made of geographic variation in the cones of Pinus contorta as related to environmental factors. Variation between four previously defined subspecies was compared to variation in geographic location, elevation, topographic situation, climate and soil. The allocation of measurement effort was optimized through preliminary studies which objectively selected a set of characters for study, and determined the number of cones to measure to represent each site.;After choosing a resemblance function with desirable properties, data structure was investigated using three-dimensional stereograms of principal components, accompanied by a demonstration that almost no distortion resulted from this procedure. A discontinuous …

In Vivo Models Of Demyelinating Disease: Coronavirus Infection Of Rats And Mice, Ole Sorensen

Digitized Theses

The period of time between exposure to a possible causative agent and the first symptoms of multiple sclerosis (MS) can be measured in decades. This has made progress toward an understanding of the initial events in this disease difficult and so a number of animal models which mimic various aspects of the disease are being studied widely. JHM virus (JHMV) and MHV-3 virus infections of mice are among these models. Less attention has been paid to the interactions of these viruses with rats.;Rats and mice of various strains were challenged at various ages with MHV-3 or JHMV intracerebrally (IC) or …

Contributions To The Estimation Of The Logit, Log Odds And Common Odds Ratio, George Anthony Wells

Digitized Theses

Asymptotic series expansions for the bias and mean square error of the logit estimator are developed. In addition, an estimator of the bias and asymptotic series for the expectation of this estimator and the estimator of the mean square error are derived. These formulations have been expressed in such a way that general coefficients can be calculated and then implemented for any choice of the parameters involved in the logit estimation problem. The formulas developed are applied, providing similar asymptotic series, for the estimation of the log odds ratio.;A general method for the linear combination of estimators is proposed. This …

A Study Of Nephrocalcinosis In The Rat: The Effects Of Inorganic Phosphate And Diets Containing Soyprotein, Rudolfs Karlis Zalups

Digitized Theses

Nephrocalcinosis has previously been detected in rats fed diets containing alkali-treated soyprotein. This is of some interest since this type of protein is used widely by the food industry and may be harmful to man.;Female weanling rats fed a diet containing 20% alpha protein (an alkali-treated soyprotein) in this study developed nephrocalcinosis of moderate severity after 9 weeks of feeding. It had previously been suggested that the inorganic phosphate content of the diet, rather than the protein, was responsible for renal calcification. To study this possibility, rats fed an alpha protein or a commercial laboratory diet were given dietary or …

Biochemical And Genetic Analyses Of Vaccinia Virus Temperature Sensitive Mutants Defective In Envelope Self-Assembly, Abdul Karim Essani

Digitized Theses

To elucidate the genetic endowment of vaccinia virus, it is essential to identify the maximum number of biological functions, inter-relate these functions to specific polypeptides and finally to locate them to precise loci on the viral genome. In such studies mutants are vital in illustrating the fundamental biological phenomenon. Recent developments in microanalytical technology have permitted systematic biochemical and genetic analyses of a group of thermo-labile mutants, derived from IHD-W strain of vaccinia, defective in envelope self-assembly.;The polypeptides of vaccinia virus were separated and analyzed by two-dimensional gel electrophoresis. Following labeling with {lcub}('35)S{rcub}-methionine, {lcub}('33)p{rcub}-phosphate, or {lcub}('3)H{rcub}-glucosamine, highly purified virions were …

Estimation And Regulation Of Uterine Prostanoids During Ovine Pregnancy And Delivery, Charles Alexander Evans

Digitized Theses

The objectives of the work described in this thesis were (1) to delineate major sites of prostanoid (PG) production in pregnant sheep by examining the concentrations of PG in intra-uterine tissues taken at different stages of pregnancy and correlating these with PG output from isolated cells prepared from these tissues and with PG concentrations in amniotic and allantoic fluids; (2) to correlate the effects of infusing ACTH to the fetal lamb and indomethacin to the mother on patterns of uterine activities and plasma steroid changes, with tissue steroid and PG concentrations and PG output in vitro; (3) to examine the …

Mouse Mammary Tumor Virus: I As A Marker For Tumor Cell Populations, And Ii Mapping Of Endogenous Loci, Janet Isabel Macinnes

Digitized Theses

Spontaneous mammary tumors in GR mice contain, in addition to the endogenous MMTV copies, acquired proviral sequences, which can be detected and characterized by the Southern transfer procedure. Hormone responsive and independent cell populations were selected from spontaneous GR tumors by transplanting tumor cell suspensions into pairs of hormone treated and untreated syngeneic males. Analysis of the acquired MMTV DNA copies revealed differences between hormone responsive and independent cell populations derived from the same tumor indicating that the original tumors were comprised of multiple cell populations. The hormone responsiveness of a tumor cell population could not be correlated with the …

Expression, Regulation And Processing Of Late Functions Involved In The Assembly Of Vaccinia Virions, Morris Moishe Silver

Digitized Theses

Poxviruses are the most complex eukaryotic viral agents when considered in terms of size, morphology, and replicative strategy. Much of the life cycle of the prototypic member of this family, vaccinia virus, has been studied using metabolic inhibitors and, more recently, conditional-lethal temperature-sensitive (ts) mutants. In this study, biochemical, electron microscopic, and genetic analysis utilizing these tools has lead to a greater understanding of the roles, first, of post-translational cleavage (PTC) and envelope assembly and, secondly, of host DNA-dependent RNA polymerase II (polymerase II) and ongoing host gene expression in vaccinia virus biogenesis.

An Ultrastructural And Biochemical Study Of The Cell Envelope Of Deinococcus Radiodurans Strain Sark, Bradley George Thompson

Digitized Theses

A descriptive study of the cell envelope of Deinococcus radiodurans strain Sark and an exploration of the major components of the cell envelope was undertaken. The cell envelope consisted of six layers as seen in thin sections: a plasma membrane, 8.0nm thick; a peptidoglycan layer, 30nm thick; a compartmentalized layer, 20 - 75nm thick; an outer membrane, 6.5nm thick; an electron transparent zone, 10nm thick, and a hexagonal surface array, 2 - 3nm thick.;The outer cell envelope layers formed blebs throughout the growth cycle, which were shed as large vesicles (0.5(mu) to 3.5(mu) in diameter) from 5% of the cell …

Morpho-Physiological Factors Affecting Plant Productivity In Bush And Vine Forms Of Winter Squash (Cucurbita Maxima Duch), Cyril Emery Broderick

Doctoral Dissertations

The productivity of a new bush winter squash cultivar ('Autumn Pride') was compared to that of 'Blue Hubbard', a high-yielding vine cultivar. Yields of 'Autumn Pride' increased with increasing plant density and, at high plant densities, were greater than yields of 'Blue Hubbard' at its near optimum plant density.

Several factors could have contributed to the higher yield potential of 'Autumn Pride'. CO(,2) compensation points were determined to be 38 ppm and 77 ppm CO(,2) for 'Autumn Pride' and 'Blue Hubbard', respectively, at 30(DEGREES)C. 'Autumn Pride' had two layers of palisade parenchyma cells, occupying 74 percent of the mesophyll. In …

Photoadaptive Responses In The Tropical Brown Seaweed, Lobophora Variegata (Lamour) Womers, Christopher David Neefus

Doctoral Dissertations

A study was undertaken to determine if natural growth irradiance regimes influence the pigment content and/or photosynthesis-irradiance relationships of the tropical brown seaweed, Lobophora variegata. Pigment analyses were performed on samples collected from a series of depths between 9 and 49m. Chlorophyll a, chlorophyll c, and fucoxanthin were constant on a thallus weight basis, but showed small decreases when expressed in terms of thallus area. The beta-carotene content of L. variegata was much greater in shallow than in deep-water samples regardless of the pigment units employed. Experimental reduction of the light regime of the shallow population, produced a significant decrease …

Genetic Efficiency In Two Loblolly Pine (Pinus Taeda L) Seed Orchards, Sharon Theresa Friedman

Doctoral Dissertations

The degree to which seed crops in seed orchards reflect the genetic variability and superiority present among orchard parents (genetic efficiency) was examined in two loblolly pine seed orchards using seven allozyme loci as genetic markers.

The frequency of outcrossed progeny in the seed crop was estimated using unique markers, a single locus mixed mating model, and a multilocus model. These estimates were 0.982, 0.992, and 0.994, respectively. Thus, selfing did not contribute significantly to deviations from genetic efficiency in these orchards.

Pollen contamination, on the other hand, was found to have a significant impact on genetic efficiency. Unique markers …

Morphological And Isozymal Variation In The Sea-Star Asterias Forbesi(Desor), Charles H. Towle Jr.

Doctoral Dissertations

Kinetic studies of the hydrogenation of carbon monoxide to methane and methanol were carried out over iron-titanium alloy catalysts, in a continuous flow fixed bed differential reactor. The catalysts studied included FeTi, Fe(,1.5)Ti and Fe(,2.5)Ti alloys with pure Fe used as a comparison. The catalysts used were all unsupported with an averaged initial particle size of 270 microns. The range of feed compositions was varied from 10 to 33% CO with the remainder being H(,2). Temperatures were varied from 520 to 590 K at a total pressure of 34 atm for all the catalysts studied. Additionally, a pressure of 13.6 …

A Characterization Of The Bacteriophage 41c And Its Lytic Cycle In Bacillus Subtilis 168, Denise Maratea

Doctoral Dissertations

The ultrastructure of the lytic cycle of phage 41c in Bacillus subtilis 168 was examined by transmission electron microscopy. Thin sections of phage 41c-infected cells revealed that, prior to the appearance of phage structures, a marked rearrangement of the tightly packed, vesicular mesosomes was usually seen within the host cells. These mesosomes opened up into loosely arranged, lamellar forms. As phage accumulated, they appeared to be preferentially associated with the mesosomes. Towards the later portion of the lytic cycle, the mesosomes took on distinctive, loosely organized, spiral configurations. These ultrastructural changes occurred even in the presence of chloramphenicol, indicating that …

Regulatory Processes In Ultra Slow Growing Microorganisms (Escherichia Coli, Bacillus Polymyxa), Michael Vincent Arbige

Doctoral Dissertations

In a continuous fermentor with 100% recycle, growth of Escherichia coli and Bacillus polymyxa occurs in three sharply distinct phases: an initial phase of exponential growth that terminates when the glucose level in the fermentor falls below transport saturation levels; a second phase of linear growth whose rate is dependent on the rate of glucose provision to the fermentor, but whose length if fixed and independent of growth rate; and a third phase of slower glucose dependent linear growth. The specific growth rate falls in phase 2 and 3 while the mass doubling time lengthen, eventually reaching hundreds of hours. …

Major Histocompatibility Complex (Mhc) Vs Non-Mhc Influences On Response To Rsv-Induced Tumors In Chickens, David Winston Brown

Doctoral Dissertations

The MHC of the chicken (B complex) has been shown to exert a decisive influence on the fate of Rous sarcoma virus (RSV)-induced tumors. However, noninbred chickens with identical B genotypes and inbred lines indistinguishable at the MHC have demonstrated considerable variation in response to RSV challenge. The major objective of this research was to determine the cause of variation in anti-Rous sarcoma response observed among chickens with "identical" B genotypes.

Chickens were evaluated for anti-tumor response following wingweb inoculation with RSV at six weeks of age. A comparison of anti-sarcoma responses of (15I-5 x 6-1)F1 versus (15I-5 x 7-2)F1 …

Morphogenetic And Ultrastructural Investigation In The Hypotrichida (Ciliophora, Protozoa): Implications In Ciliate Evolution, Barry James Wicklow

Doctoral Dissertations

Hypotrichs represent a highly diverse species ensemble displaying a wide range of form and function that reflects extensive radiation in a wide variety of habitats. Because of their constancy through time, particular habitats such as marine sands harbor forms that may have persisted with little change for hundreds of millions of years and, hence, may hold clues to help unravel mysteries of ciliate evolution. Using light optical microscopy and both scanning and transmission electron microscopy, I examine cortical morphogenesis through cell division and interphase ultrastructure of several species of marine ciliates. Using this information I propose phylogenetic relationships within the …

Exophylactic And Necrophylactic Periderm Development In American Beech, William Dow Ostrofsky

Doctoral Dissertations

American beech (Fagus grandifolia Ehrh.) in forest stands of North America are threatened by a destructive disease commonly known as the beech bark disease. Investigations on bark structure and on response of bark tissues to mechanical injury and pathogen invasion would increase our understanding of the etiology of this disease. The objectives of this investigation were to provide descriptions of the development and anatomy of bark of American beech, with emphasis on bark periderms. Investigations were made of the ontogeny of the first exophylactic periderm, and on characteristics and development of the necrophylactic periderms resulting from the beech bark disease …

Ecology And Genecology Of Fucus Distichus (L) Powell, Eric Joseph Sideman

Doctoral Dissertations

Growth rates, reproductive phenology, and longevity of Fucus distichus ssp. edentatus and F. distichus ssp. evanescens were evaluated in natural populations in New England. Both subspecies exhibited maximum growth during early summer, a slight decline in late summer, and a brief resurgence in the early fall. The maximum growth rates (in terms of elongation) for ssp. edentatus and ssp. evanescens was 3.5 cm/mo and 3.7 cm/mo, respectively. Populations of both subspecies showed a distinct bimodal reproductive periodicity, with maximums in the spring and fall. Individuals within natural populations were reproductive in either the spring or fall but never both seasons. …

Electrophysiological Studies On Ulmus Americana, Jill Stanley Kathleen Shipman

Doctoral Dissertations

Although membrane potentials have been measured in algal cells and in large cells of some higher plants, this investigation is the first to include such measurements in mesophyll cells of elm (Ulmus americana) leaves. The inquiry entailed the development of the technique for measuring elm leaf cell membrane potentials, the determination of membrane potentials expected of healthy, greenhouse elms, and the effects of various physical and chemical factors on the membrane potentials of elm leaf cells.

The membrane potential of a specific cell, was measured by amplifying the potential difference between a microelectrode inserted in the cell and a reference …

Inheritance Of Resistance To Soil Rot, Streptomyces Ipomoea And Other Characters In The Sweet Potato, Ipomoea Batatas, L., Roberto Soenarjo Dwidjosewoyo

LSU Historical Dissertations and Theses

Genetic study on sweet potato resistance to the soil rot disease, Streptomyces ipomoea and other characters was conducted from 1979 through 1981. In control crosses, L(,3)-64 was incompatible with L(,4)-62 and L(,4)-112 with L(,4)-131. The average pod set for all progenies was 16.95%. Additive genetic effects were more important than non-additive in the inheritance of resistance. Resistant families were only produced from crosses between resistant parents and most progenies from crosses of moderatley resistant x resistant, resistant x susceptible and moderately resistant x susceptible parents produced moderately resistant segregates. Polycross progenies from resistant parents, L(,4)-131 and L(,6)-135, had families with …