Latest content added for UNT Digital Library Partner: UNT Librarieshttps://digital.library.unt.edu/explore/partners/UNT/browse/?start=40&fq=str_location_country:United+States&fq=str_degree_department:Department+of+Biology2013-06-04T22:29:06-05:00UNT LibrariesThis is a custom feed for browsing UNT Digital Library Partner: UNT LibrariesThe Production of Fragile Cysts by an Aberrant Strain of Azotobacter Chroococcum Isolated from Soil2013-06-04T22:29:06-05:00https://digital.library.unt.edu/ark:/67531/metadc163942/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc163942/"><img alt="The Production of Fragile Cysts by an Aberrant Strain of Azotobacter Chroococcum Isolated from Soil" title="The Production of Fragile Cysts by an Aberrant Strain of Azotobacter Chroococcum Isolated from Soil" src="https://digital.library.unt.edu/ark:/67531/metadc163942/small/"/></a></p><p>The purpose of this study is to determine if a strain of Azotobacter chroococcum isolated from the soil in northern Louisiana produces cysts which are as resistant to deleterious agents as those produced by previously reported strains os Azotobacter.</p>The Autecology of Celtis Laevigata in Flood Plain Forests of Denton County, Texas2013-06-04T22:29:06-05:00https://digital.library.unt.edu/ark:/67531/metadc163960/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc163960/"><img alt="The Autecology of Celtis Laevigata in Flood Plain Forests of Denton County, Texas" title="The Autecology of Celtis Laevigata in Flood Plain Forests of Denton County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc163960/small/"/></a></p><p>This thesis describes the present nature of one facet of some of the flood plain forest stands in Denton County, Texas. The specific purpose was to demonstrate the presence or absence of difference between the Celtis laevigata (commonly known as the hackberry, southern hackberry or sugarberry) populations in stands on Denton Creek and Elm Fork of the Trinity River.</p>A Study of a Branchiobdellid from Denton County, Texas2013-06-04T22:29:06-05:00https://digital.library.unt.edu/ark:/67531/metadc163966/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc163966/"><img alt="A Study of a Branchiobdellid from Denton County, Texas" title="A Study of a Branchiobdellid from Denton County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc163966/small/"/></a></p><p>In this study, branchiobdellids were collected from crayfish captured from two adjacent sites in Denton County, Texas. Identification of the branchiobdellid, Cambarincola vitrea Ellis, was first made and then work was extended to include several topics of ecological interest.</p>Distribution, Size, Condition, and Food Habits of Selected Fishes in a Reservoir Receiving Heated Effluent from a Power Plant2013-06-04T22:29:06-05:00https://digital.library.unt.edu/ark:/67531/metadc164031/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc164031/"><img alt="Distribution, Size, Condition, and Food Habits of Selected Fishes in a Reservoir Receiving Heated Effluent from a Power Plant" title="Distribution, Size, Condition, and Food Habits of Selected Fishes in a Reservoir Receiving Heated Effluent from a Power Plant" src="https://digital.library.unt.edu/ark:/67531/metadc164031/small/"/></a></p><p>This study was undertaken in order to provide further insight into the effects of artificial heating on the fisheries of a small reservoir in the Southwest. The following specific objectives were established: (1) to map the reservoir for the distribution of heated water, (2) to determine the distribution of selected species of sports, rough, and forage fish in areas affected by the effluent and in areas not affected, (3) to compare size and condition of selected species of fish from areas affected by the effluent to size and condition of fish from areas not affected, and (4) to compare food habits of channel catfish in areas affected by the effluent to the food habits of channel catfish in areas not affected.</p>Studies of the Passive Dispersal of Viable Algae and Protozoa by Aquatic and Terrestrial Beetles2013-06-04T22:29:06-05:00https://digital.library.unt.edu/ark:/67531/metadc164356/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc164356/"><img alt="Studies of the Passive Dispersal of Viable Algae and Protozoa by Aquatic and Terrestrial Beetles" title="Studies of the Passive Dispersal of Viable Algae and Protozoa by Aquatic and Terrestrial Beetles" src="https://digital.library.unt.edu/ark:/67531/metadc164356/small/"/></a></p><p>The purpose of the present study was to determine the relative importance of aquatic and terrestrial beetles as possible vehicles in the passive overland dispersal of viable microorganisms.</p>The Effects of Hexadecanol on the Microbiota of Lake Hefner2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130939/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130939/"><img alt="The Effects of Hexadecanol on the Microbiota of Lake Hefner" title="The Effects of Hexadecanol on the Microbiota of Lake Hefner" src="https://digital.library.unt.edu/ark:/67531/metadc130939/small/"/></a></p><p>It seemed desirable to investigate more fully the effect of hexadecanol on the microbial population of a reservoir. It was the purpose of this investigation to determine the effect of hexadecanol on the micro-biota of Lake Hefner, to ascertain which organisms were stimulated by hexadecanol both in the laboratory and the reservoir, and to investigate the degradation of hexadecanol by microorganisms selected from Lake Hefner.</p>A Qualitative Survey of the Airborne Algae, Protozoa, and Bacteria at the Denton Sewage Treatment Plant2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130953/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130953/"><img alt="A Qualitative Survey of the Airborne Algae, Protozoa, and Bacteria at the Denton Sewage Treatment Plant" title="A Qualitative Survey of the Airborne Algae, Protozoa, and Bacteria at the Denton Sewage Treatment Plant" src="https://digital.library.unt.edu/ark:/67531/metadc130953/small/"/></a></p><p>This study had a three-fold purpose. First, it was decided to determine if algae and protozoa were emitted to the air at the Denton sewage treatment plant. The information obtained could be of future importance in the fields of algal and protozoan ecology and public health. Second, it was decided to make a survey of the airborne bacteria at this plant. Some researchers have described bacterial air contamination at similar sewage treatment plants, but the one in Denton has not been studied. Third, it was hoped that in this research some relationships could be found between the bacteria and the algae and protozoa in the air in the vicinity of the sewage aeration basin. It was hypothesized that pathogenic bacteria were carried in the air with these other organisms.</p>Parasites of the Cricket Frog, Acris Crepitans, of Denton County, Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130977/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130977/"><img alt="Parasites of the Cricket Frog, Acris Crepitans, of Denton County, Texas" title="Parasites of the Cricket Frog, Acris Crepitans, of Denton County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc130977/small/"/></a></p><p>The purpose of this study was threefold. The literature concerning parasites of A. crepitans was to be brought up to date. Contributions to the general body of knowledge pertaining to the parasitic fauna of host specimens of A. crepitans and specifically those found in Denton County, Texas, were to be made. Finally, specimens found parasitizing host specimens of A. crepitans were to be preserved and classified.</p>Presence of Krebs Cycle Intermediates in Primary Mycelia of an Actinomycete2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130979/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130979/"><img alt="Presence of Krebs Cycle Intermediates in Primary Mycelia of an Actinomycete" title="Presence of Krebs Cycle Intermediates in Primary Mycelia of an Actinomycete" src="https://digital.library.unt.edu/ark:/67531/metadc130979/small/"/></a></p><p>The purpose of this study is to determine the presence or absence of a typical Krebs cycle metabolism in the primary mycelia of an aquatic streptomycete.</p>A Bacteriological Survey of a Freshwater Reservoir2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130924/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130924/"><img alt="A Bacteriological Survey of a Freshwater Reservoir" title="A Bacteriological Survey of a Freshwater Reservoir" src="https://digital.library.unt.edu/ark:/67531/metadc130924/small/"/></a></p><p>In this study organisms that can be subcultured from lake water, using a prescribed procedure, limit, to an extent, the population, or portions of the population, that can be monitored. In essence, what is taking place is that a set of conditions is set forth and a study is made of the bacteria that will grow under these prescribed conditions.</p>Distribution of Phosphates in a Sewage Plant and its Receiving Waters2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131093/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131093/"><img alt="Distribution of Phosphates in a Sewage Plant and its Receiving Waters" title="Distribution of Phosphates in a Sewage Plant and its Receiving Waters" src="https://digital.library.unt.edu/ark:/67531/metadc131093/small/"/></a></p><p>The purpose of this paper is to detail the distribution and quantity of soluble phosphates in an activated sludge plant, its discharge creek, and receiving reservoir. The resultant analyses and comparison of data should provide some better understanding of the fate of phosphorus in a Southwestern waterway system.</p>Quantitative Aspects of the Microflora of an Overland Flow Spray Irrigation Sewage Disposal System2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131100/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131100/"><img alt="Quantitative Aspects of the Microflora of an Overland Flow Spray Irrigation Sewage Disposal System" title="Quantitative Aspects of the Microflora of an Overland Flow Spray Irrigation Sewage Disposal System" src="https://digital.library.unt.edu/ark:/67531/metadc131100/small/"/></a></p><p>It was the purpose of this investigation to attempt to quantitate the microflora of the fields which receive the effluent from the Campbell Soup Plant, Paris, Texas, and to determine whether or not there is a correlation between the numbers and types of organisms present and the efficiency of purification of the system.</p>The Stoneflies (Plecoptera) of Oklahoma2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131560/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131560/"><img alt="The Stoneflies (Plecoptera) of Oklahoma" title="The Stoneflies (Plecoptera) of Oklahoma" src="https://digital.library.unt.edu/ark:/67531/metadc131560/small/"/></a></p><p>Distributional data and taxonomic keys art presented for thirty-four species of Plecoptera known to occur in Oklahoma. Ten species are new records for the state. Descriptions are provided for two species new to science, Zealeuctra cherokee and Isoperla brevis, and for the previously unknown male of Strophopteryx cucullata Frison and female of Helopicus nalatus (Frison).</p>The Life History and Ecology of the Stonefly Neoperla clymene (Newman) (Plecoptera: Perlidae)2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131563/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131563/"><img alt="The Life History and Ecology of the Stonefly Neoperla clymene (Newman) (Plecoptera: Perlidae)" title="The Life History and Ecology of the Stonefly Neoperla clymene (Newman) (Plecoptera: Perlidae)" src="https://digital.library.unt.edu/ark:/67531/metadc131563/small/"/></a></p><p>The objective of this investigation was to provide new and more detailed information on the life history and ecology of Neoperla clymene, through an intensive study of the species in the Brazos River, Texas.</p>Density, Distribution, Production and Drift of Benthic Fauna in a Reservoir Receiving Thermal Discharges from a Steam Electric Generating Plant2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131579/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131579/"><img alt="Density, Distribution, Production and Drift of Benthic Fauna in a Reservoir Receiving Thermal Discharges from a Steam Electric Generating Plant" title="Density, Distribution, Production and Drift of Benthic Fauna in a Reservoir Receiving Thermal Discharges from a Steam Electric Generating Plant" src="https://digital.library.unt.edu/ark:/67531/metadc131579/small/"/></a></p><p>The effects of thermal discharges on the density, distribution, production, and drift of benthic organisms were studied at North Lake reservoir.</p>Food Habits and Dietary Overlap of Four Species of Rodents from the Mesquite Plains of Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131498/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131498/"><img alt="Food Habits and Dietary Overlap of Four Species of Rodents from the Mesquite Plains of Texas" title="Food Habits and Dietary Overlap of Four Species of Rodents from the Mesquite Plains of Texas" src="https://digital.library.unt.edu/ark:/67531/metadc131498/small/"/></a></p><p>The coexistence of Dipodomys ordii and Perognathus hispidus with Peromyscus maniculatus and Reithrodontomys montanus was studied in a grassland association of central Texas. The food habits of these species were compared with information from habitat vegetation analysis in an effort to determine food selectivity and the amount and importance of niche overlap and competition among these rodents.</p>Geographic Variation in Chromosomes and Morphology of Peromyscus Maniculatus in Texas and Oklahoma2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131533/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131533/"><img alt="Geographic Variation in Chromosomes and Morphology of Peromyscus Maniculatus in Texas and Oklahoma" title="Geographic Variation in Chromosomes and Morphology of Peromyscus Maniculatus in Texas and Oklahoma" src="https://digital.library.unt.edu/ark:/67531/metadc131533/small/"/></a></p><p>This study was initiated after finding two chromosomal types of Peromyscus maniculatus north and south of the Red River in Texas and Oklahoma. The problem was to explain the chromosomal variations and their implications to the systematics of the grassland subspecies of P. maniculatus in this region.</p>Annual Lipid Cycles in the Lizard Cnemidophorus Tigris2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131545/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131545/"><img alt="Annual Lipid Cycles in the Lizard Cnemidophorus Tigris" title="Annual Lipid Cycles in the Lizard Cnemidophorus Tigris" src="https://digital.library.unt.edu/ark:/67531/metadc131545/small/"/></a></p><p>Annual lipid cycles were determined for adult male and female Cnemidophorus tigris collected near El Paso, Texas during 1970-1971.</p>The Biological Elimination of Phenols in the Effluent of a Wood Preserving Plant2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131445/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131445/"><img alt="The Biological Elimination of Phenols in the Effluent of a Wood Preserving Plant" title="The Biological Elimination of Phenols in the Effluent of a Wood Preserving Plant" src="https://digital.library.unt.edu/ark:/67531/metadc131445/small/"/></a></p><p>The removal of phenols from the waste waters of wood preserving plants has always presented problems. The purpose of this paper is to investigate the possibility of employing a biological system to reduce the phenol content of effluent from these plants.</p>A Comparison of the Carbon Dioxide and Oxygen Rate of Change Methods for Measuring Primary Productivity2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131118/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131118/"><img alt="A Comparison of the Carbon Dioxide and Oxygen Rate of Change Methods for Measuring Primary Productivity" title="A Comparison of the Carbon Dioxide and Oxygen Rate of Change Methods for Measuring Primary Productivity" src="https://digital.library.unt.edu/ark:/67531/metadc131118/small/"/></a></p><p>The purpose of this study was to demonstrate the variability of oxygen and carbon dioxide rate of change methods for measuring primary productivity and respiration in an aquatic environment.</p>Terrestrial Vertebrates of Fannin County, Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131215/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131215/"><img alt="Terrestrial Vertebrates of Fannin County, Texas" title="Terrestrial Vertebrates of Fannin County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc131215/small/"/></a></p><p>The purposes of this thesis were (1) to provide some knowledge of the herptiles and mammals of this area, (2) to clarify the distribution of many of these animals in this section of Texas, and (3) to provide additional ecological information about the area.</p>An Ecological Survey of the Reptiles and Amphibians of Wise county, Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131229/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131229/"><img alt="An Ecological Survey of the Reptiles and Amphibians of Wise county, Texas" title="An Ecological Survey of the Reptiles and Amphibians of Wise county, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc131229/small/"/></a></p><p>The purpose of this study was to record the relationships between the reptiles and amphibians of Wise County and the ecological subdivisions of the area. Wise County was chosen because of the heterogenity of the area and because of its proximity to other counties which have been previously and similarly studied.</p>Studies on Microorganisms in Jet Aircraft Fuel Systems2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131240/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131240/"><img alt="Studies on Microorganisms in Jet Aircraft Fuel Systems" title="Studies on Microorganisms in Jet Aircraft Fuel Systems" src="https://digital.library.unt.edu/ark:/67531/metadc131240/small/"/></a></p><p>Laboratory and field investigations during the past ten years have demonstrated that certain microorganisms can cause deleterious effects in jet fuel tank systems. These investigations have brought about new concepts concerning the mechanisms of utilization of certain constituents in jet fuel tanks by microorganisms. Since the presence of microorganisms is inevitable in fuel systems, research efforts have been directed towards identification and determination of the types of microorganisms which can utilize jet fuel hydrocarbons, fuel additives, polyurethane foam structural materials, and particular hydrocarbons present in the fuel.</p>An Analysis of Distribution Patterns of Amphibians and Reptiles in Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131149/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131149/"><img alt="An Analysis of Distribution Patterns of Amphibians and Reptiles in Texas" title="An Analysis of Distribution Patterns of Amphibians and Reptiles in Texas" src="https://digital.library.unt.edu/ark:/67531/metadc131149/small/"/></a></p><p>The purpose of this investigation was to analyze the distribution of amphibians and reptiles in Texas by means of the methods of Webb and Hagmeier and Stults. An additional graphical analysis was made, including range and range limits which provides a cross-section of faunal change along selected base lines across the state.</p>Ecological Distribution of the Herpetofauna of Montague County, Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131155/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131155/"><img alt="Ecological Distribution of the Herpetofauna of Montague County, Texas" title="Ecological Distribution of the Herpetofauna of Montague County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc131155/small/"/></a></p><p>The purpose of this study was to make a preliminary study of the herpetofauna of Montague County in relation to ecological distribution. Also taken into consideration were the zoogeographic relationships of the various species.</p>An Ecological Survey of the Herpetofauna of Palo Pinto County, Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131166/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131166/"><img alt="An Ecological Survey of the Herpetofauna of Palo Pinto County, Texas" title="An Ecological Survey of the Herpetofauna of Palo Pinto County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc131166/small/"/></a></p><p>The purpose of this research was to compile a presence list of reptiles and amphibians that occur in Palo Pinto County, Texas, and to investigate the ecological distributions and zoogeographic affinities of these herpetiles. The study area was chosen primarily because of its location in North Central Texas and its rugged topography, which sets it apart from the surrounding area.</p>Microbiotic Cycles in Lake Hefner2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130654/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130654/"><img alt="Microbiotic Cycles in Lake Hefner" title="Microbiotic Cycles in Lake Hefner" src="https://digital.library.unt.edu/ark:/67531/metadc130654/small/"/></a></p><p>The purposes of this paper are 1) to determine the microbiotic cycles which occur in Lake Hefner in order to form a basis for ascertaining the effects of future additions of evaporation control chemicals on the biological life of this reservoir, and 2) to make a generalization as to the microbiotic cycles which might occur in Southwestern reservoirs.</p>Bentric Algae of Selected Thermal Springs of Yellowstone National Park2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130511/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130511/"><img alt="Bentric Algae of Selected Thermal Springs of Yellowstone National Park" title="Bentric Algae of Selected Thermal Springs of Yellowstone National Park" src="https://digital.library.unt.edu/ark:/67531/metadc130511/small/"/></a></p><p>The purpose of this investigation was to characterize the population dynamics of the benthos of selected pristine thermal springs.</p>Rectal Temperatures of the Cotton Rat, Sigmodon Hispidus (Rodentia : Cricetidae)2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130983/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130983/"><img alt="Rectal Temperatures of the Cotton Rat, Sigmodon Hispidus (Rodentia : Cricetidae)" title="Rectal Temperatures of the Cotton Rat, Sigmodon Hispidus (Rodentia : Cricetidae)" src="https://digital.library.unt.edu/ark:/67531/metadc130983/small/"/></a></p><p>This investigation has been concerned with determining the extent to which a small mammal, the cotton rat, may become acclimated to environmental temperatures, and the influence acclimation has upon a population. The study was also designed to determine if acclimation effects on a population can be seen in individual rats.</p>An Ecological Study of the Pine Vole, Microtus Pinetorum, in Northeast Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131414/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131414/"><img alt="An Ecological Study of the Pine Vole, Microtus Pinetorum, in Northeast Texas" title="An Ecological Study of the Pine Vole, Microtus Pinetorum, in Northeast Texas" src="https://digital.library.unt.edu/ark:/67531/metadc131414/small/"/></a></p><p>This study dealt with the life history and population dynamics of the pine vole, Microtus pinetorum. In the past there has been a void of ecological material concerning this small mammal in the southwestern region of its range. From November, 1969, through February, 1970, a survey was conducted in Marion County and Harrison County, Texas, to determine the most suitable habitat for an ecological study of Microtus pinetorum. A study was then initiated in March, 1970, and continued through March, 1971, on an undisturbed marsh five miles south of Marshall, Harrison County, Texas.</p>Biological Indices of Stream Pollution2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130298/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130298/"><img alt="Biological Indices of Stream Pollution" title="Biological Indices of Stream Pollution" src="https://digital.library.unt.edu/ark:/67531/metadc130298/small/"/></a></p><p>A thorough biological survey and evaluation is a lengthy and expensive project. The number of technically trained persons required prevent its use by most public agencies. Since public health departments are the groups most frequently concerned with measuring the effects of pollution in streams, a need exists for a simplified method of sanitary survey. Recognizing this need, the Texas Health Department assigned the writer the problem of devising a method of survey which would require a field party of two and could be conducted entirely from a mobile field laboratory.</p>An Investigation of Selected Factors Related to the Professional Status of the Science Teachers in the Four-Year Accredited High Schools of Texas for the School Year 1952-19532012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130351/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130351/"><img alt="An Investigation of Selected Factors Related to the Professional Status of the Science Teachers in the Four-Year Accredited High Schools of Texas for the School Year 1952-1953" title="An Investigation of Selected Factors Related to the Professional Status of the Science Teachers in the Four-Year Accredited High Schools of Texas for the School Year 1952-1953" src="https://digital.library.unt.edu/ark:/67531/metadc130351/small/"/></a></p><p>The purpose of this study is to gather information related to the professional status of the science teachers in the four-year accredited high schools of Texas for the school year 1952-1953. The principal concern of the study is "Who is teaching science?"</p>The Cultural, Physiological, Morphological and Chemical Characteristics of an Actinomycete from Lake Waco, Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc130361/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc130361/"><img alt="The Cultural, Physiological, Morphological and Chemical Characteristics of an Actinomycete from Lake Waco, Texas" title="The Cultural, Physiological, Morphological and Chemical Characteristics of an Actinomycete from Lake Waco, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc130361/small/"/></a></p><p>The purpose then of this paper has been to expand our knowledge of these aquatic forms by investigating the cultural, physiological, morphological, and chemical characteristics of an actinomycete isolated from the water supply, Lake Waco, of Waco, Texas.</p>Spring Food Habits of Corydalus Cornutus L. in the Brazos River, Texas2012-12-27T22:03:54-06:00https://digital.library.unt.edu/ark:/67531/metadc131411/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc131411/"><img alt="Spring Food Habits of Corydalus Cornutus L. in the Brazos River, Texas" title="Spring Food Habits of Corydalus Cornutus L. in the Brazos River, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc131411/small/"/></a></p><p>The objective of this study was to determine the kinds and numbers of food organisms consumed by Corydalus cornutus, and to investigate its periodicity of feeding during the spring months in the Brazos River, Palo Pinto County, Texas. A total of 468 larvae were collected at two-week intervals from February 29 to May 14, 1971. Larvae were taken at opportunity during three periods of the day, 6am.-12pm., 12pm.-6pm., and 6pm.-12am. A total of 23 different food items was observed in the 121 stomachs containing food. An expedient method of dissection of the digestive tract is included.</p>Assimilation of Inorganic Nitrogen by Aquatic Actinomycetes2012-10-12T10:26:10-05:00https://digital.library.unt.edu/ark:/67531/metadc108150/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc108150/"><img alt="Assimilation of Inorganic Nitrogen by Aquatic Actinomycetes" title="Assimilation of Inorganic Nitrogen by Aquatic Actinomycetes" src="https://digital.library.unt.edu/ark:/67531/metadc108150/small/"/></a></p><p>It was the purpose of this investigation to present laboratory data concerning the assimilation of inorganic nitrogen by the aquatic actinomycetes. The strains of aquatic actinomycetes under consideration represented a cross section of those currently under culture at North Texas State University.</p>A Study of Selected Factors Related to Permanency in Science Teaching2012-10-12T10:26:10-05:00https://digital.library.unt.edu/ark:/67531/metadc108009/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc108009/"><img alt="A Study of Selected Factors Related to Permanency in Science Teaching" title="A Study of Selected Factors Related to Permanency in Science Teaching" src="https://digital.library.unt.edu/ark:/67531/metadc108009/small/"/></a></p><p>The purpose of this study is to gather information related to some factors which are considered to be characteristic of science teaching; to attempt to identify some elements of permanency in science teaching; and to analyze some relationships between the results of the above two criteria with the view of establishing some factors which may be useful as predictors of permanency, or indicative of patterns of permanency, in science teaching.</p>Degradation of Complex Carbon Compounds by Marine Actinomycetes2012-10-12T10:26:10-05:00https://digital.library.unt.edu/ark:/67531/metadc108067/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc108067/"><img alt="Degradation of Complex Carbon Compounds by Marine Actinomycetes" title="Degradation of Complex Carbon Compounds by Marine Actinomycetes" src="https://digital.library.unt.edu/ark:/67531/metadc108067/small/"/></a></p><p>The purpose of this paper is to present a comparative study of marine bacteria, molds and actinomycetes in regard to their ability to degrade certain pure and mixed complex compounds possibly occurring in the lagoon waste traps of the Texas Gulf Coast. This comparison was made using a differential oxygen uptake as the index of specific compound utilization.</p>Survival and Growth of Bacteria in Chlorine Treated Water2012-10-12T10:26:10-05:00https://digital.library.unt.edu/ark:/67531/metadc107959/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc107959/"><img alt="Survival and Growth of Bacteria in Chlorine Treated Water" title="Survival and Growth of Bacteria in Chlorine Treated Water" src="https://digital.library.unt.edu/ark:/67531/metadc107959/small/"/></a></p><p>In this problem, an attempt was made to determine the fate of various species of bacteria which had previously been isolated from other sources when inoculated into Denton tap water.</p>Microflora Found in a Selected Group of Food Products Enclosed in a Protective Wrapper2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc96850/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96850/"><img alt="Microflora Found in a Selected Group of Food Products Enclosed in a Protective Wrapper" title="Microflora Found in a Selected Group of Food Products Enclosed in a Protective Wrapper" src="https://digital.library.unt.edu/ark:/67531/metadc96850/small/"/></a></p><p>The purposes of this study are, first, to determine relative numbers and predominant types of bacterial organisms in the various food products studied; second, to evaluate the efficiency of the paper coverings of these foods; and third, to determine whether these products are potential sources of food poisoning.</p>Antibiocity of the Oleoresins of One Hundred Texas Spermatophytes upon Twenty Gram-Positive Bacterial Organisms2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc96860/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96860/"><img alt="Antibiocity of the Oleoresins of One Hundred Texas Spermatophytes upon Twenty Gram-Positive Bacterial Organisms" title="Antibiocity of the Oleoresins of One Hundred Texas Spermatophytes upon Twenty Gram-Positive Bacterial Organisms" src="https://digital.library.unt.edu/ark:/67531/metadc96860/small/"/></a></p><p>This investigation is concerned with the testing, in vitro, of oleoresins from one hundred higher plants common to North and South Central Texas. The plants used were selected in order to obtain a representative collection which might be of value in future research.</p>An Investigation of Microbial Antagonism in Ten Denton County, Texas Soils2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc97003/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc97003/"><img alt="An Investigation of Microbial Antagonism in Ten Denton County, Texas Soils" title="An Investigation of Microbial Antagonism in Ten Denton County, Texas Soils" src="https://digital.library.unt.edu/ark:/67531/metadc97003/small/"/></a></p><p>This thesis is concerned primarily with the growth and detection of soil microorganisms in ten Denton County, Texas, soils antagonistic to a specific gram-positive and a specific gram-negative bacterial organism.</p>The Chemical Compounds Produced by Actinomycetes and Their Relation to Tastes and Odors in a Water Supply2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc97004/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc97004/"><img alt="The Chemical Compounds Produced by Actinomycetes and Their Relation to Tastes and Odors in a Water Supply" title="The Chemical Compounds Produced by Actinomycetes and Their Relation to Tastes and Odors in a Water Supply" src="https://digital.library.unt.edu/ark:/67531/metadc97004/small/"/></a></p><p>The purpose of this problem was to determine the cause of tastes and odors in the Breckenridge water supply and to isolate and culture the organisms responsible for the offensive chemicals.</p>Pathogenic Bacterial Survey in the Trinity River from East Fort Worth, Texas, to South Dallas, Texas2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc97013/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc97013/"><img alt="Pathogenic Bacterial Survey in the Trinity River from East Fort Worth, Texas, to South Dallas, Texas" title="Pathogenic Bacterial Survey in the Trinity River from East Fort Worth, Texas, to South Dallas, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc97013/small/"/></a></p><p>This study was conducted from March 3, through June 2, 1951, in order to determine to what extent pathogenic bacteria were entering the Trinity River between East Fort Worth, Texas and South Dallas, Texas, from municipal sewage disposal plants.</p>A Microbial Survey of Raw Ingredients Used in Finished Products at Kraft Foods Company, Garland, Texas2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc97028/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc97028/"><img alt="A Microbial Survey of Raw Ingredients Used in Finished Products at Kraft Foods Company, Garland, Texas" title="A Microbial Survey of Raw Ingredients Used in Finished Products at Kraft Foods Company, Garland, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc97028/small/"/></a></p><p>The purpose of this investigation is to determine through routine checks the number of organisms present in the various raw ingredients used for the preparation of foods. The problem has consisted of, first, a determination of the total bacterial population by numbers; second, a determination of the incidence of colon bacteria in the samples examined; third, a determination of the presence of yeasts and molds; and fourth, an attempt to utilize this information obtained in judging the methods of handling the raw ingredients before they are used in the processing of foods.</p>Age, Growth, and Food Habits of the Largemouthed Black Bass (Micropterus Salmoides) and the Spotted Bass (Micropterus Puctulatus SSP) in North and East Texas Lakes2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc96895/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96895/"><img alt="Age, Growth, and Food Habits of the Largemouthed Black Bass (Micropterus Salmoides) and the Spotted Bass (Micropterus Puctulatus SSP) in North and East Texas Lakes" title="Age, Growth, and Food Habits of the Largemouthed Black Bass (Micropterus Salmoides) and the Spotted Bass (Micropterus Puctulatus SSP) in North and East Texas Lakes" src="https://digital.library.unt.edu/ark:/67531/metadc96895/small/"/></a></p><p>This study is based on the examinations and analyses of 388 largemouthed black bass (Micropterus salmoides) and 118 spotted black bass (Micropterus puctulatus ssp.) which were collected over a period of three years from 9 lakes in the North-Central and East Texas areas. The results should show the following: (1) the average age of the black bass in each of the nine reservoirs in Texas; (2) the growth rate of the bass in these reservoirs; (3) the feeding habits of the bass in all reservoirs studied; (4) a comparison of the growth rates of the largemouthed and spotted basses; and (5) a comparison of the growth rates of bass from Texas and Oklahoma.</p>A Correlation of the Vegetation with the Soil Types of Haskell County, Texas2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc96906/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96906/"><img alt="A Correlation of the Vegetation with the Soil Types of Haskell County, Texas" title="A Correlation of the Vegetation with the Soil Types of Haskell County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc96906/small/"/></a></p><p>The problem has consisted, first, of a mapping of the soil types present in Haskell County; second, a collection of the existing vegetation of each soil type; third, an identification of the vegetation collected and observed; fourth, and lastly, a comparative study of the vegetation of each soil type in an effort to establish a correlation between the vegetation and the soil type.</p>The Adaptability and Present Status of Andropogon Ischaemum L. in Denton County, Texas2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc96951/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96951/"><img alt="The Adaptability and Present Status of Andropogon Ischaemum L. in Denton County, Texas" title="The Adaptability and Present Status of Andropogon Ischaemum L. in Denton County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc96951/small/"/></a></p><p>This investigation has been made with reference to the adaptability of Andropogon ischaemum, King Ranch bluestem, to various soils, various slopes, and various erosion conditions in Denton County.</p>A Grassland Evaluation of Eastland County, Texas2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc96957/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96957/"><img alt="A Grassland Evaluation of Eastland County, Texas" title="A Grassland Evaluation of Eastland County, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc96957/small/"/></a></p><p>This investigation has had for its purpose the determination of first, all members of the Gramineae (Grass) family found in the county; second, the incidence of each species with the various types of soil; third, the grazing value of each species; fourth, the life span of the parent plants; fifth, the present grassland status; and sixth, the potentialities of developing desirable grassland.</p>The Isolation and Identification of Micro-Organisms from Spoons of Public Eating Establishments in Denton, Texas2012-08-14T09:01:15-05:00https://digital.library.unt.edu/ark:/67531/metadc96865/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc96865/"><img alt="The Isolation and Identification of Micro-Organisms from Spoons of Public Eating Establishments in Denton, Texas" title="The Isolation and Identification of Micro-Organisms from Spoons of Public Eating Establishments in Denton, Texas" src="https://digital.library.unt.edu/ark:/67531/metadc96865/small/"/></a></p><p>This investigation deals with the isolation and identification of bacteria found on selected samples of spoons in various eating establishments in the vicinity of Denton, Texas.</p>The Reproductive Cycles of Five Species of Texas Centrarchids2012-04-23T22:13:18-05:00https://digital.library.unt.edu/ark:/67531/metadc83444/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc83444/"><img alt="The Reproductive Cycles of Five Species of Texas Centrarchids" title="The Reproductive Cycles of Five Species of Texas Centrarchids" src="https://digital.library.unt.edu/ark:/67531/metadc83444/small/"/></a></p><p>This thesis examines the reproductive cycles of five species of Texas centrarchids: the largemouthed black bass, the black crappie, the bluegill, the redear sunfish, and the striped bass. In this report attention is given to the reproductive cycles of the five species for a period of one year.</p>