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Evidence Of Eutrophication In Wall Lake Barry County, Michigan, John J. Meany

Masters Theses

No abstract provided.

Metabolism Of 3-Isopropyl-4h-2,1,3-Benzothiadiazin-4-(3h)-One-2,2-Dioxide (Bentazon) In Agitated And Non-Agitated Sediment, David Cortez Gutierrez

Theses and Dissertations

Bentazon, (3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-l-2,2-dioxide) a new experimental herbicide, was studied under the effects of sterile and non-sterile conditions, 12 hours light: 12 hours dark and totally dark conditions, and agitated and non-agitated conditions in aquatic sediment. The effects of the different levels of BOD/COD values on the decomposition of Bentazon were studied. Photoperiod, sterility, and BOD/COD levels appeared to have no influence in the breakdown of Bentazon. Agitation-time interaction appeared to be the only factor that influenced the more rapid degradation of Bentazon. Bentazon was the major 14C-residue found in the water; it was followed by an unknown. The third major metabolite …

Coastal Vegetational Communities Of The Two Texas Barrier Islands, Boca Chica And Brazos, Baltazar Cisneros

Theses and Dissertations - UTB/UTPA

Two Texas barrier islands, Boca Chica and Brazos, have unique coastal vegetational communities that may be Influenced by several environmental factors. These environmental factors include temperature, precipitation, wind speed, sunshine exposure, day length, and dune height. The purpose of this investigation was to determine the total number of coastal plant species per station, season, and year and to consider environmental factors that may significantly affect the number and pattern of coastal species. Coverage comparison between aerial and land sampling and aerial vegetational zonation was also considered.

Results indicated the presence of 21 angiosperm families and a total of 54 species. …

A Taxonomic And Ecologic Study Of The Riverbottom Forest On St. Mary River, Lee Creek And Belly River In Southwest Alberta, Canada, Robert Keith Shaw

Theses and Dissertations

The riverbottom forest community of St. Mary River, Lee Creek and Belly River in southwest Alberta, Canada is a unique ecological entity characterized by poplar species having their major Alberta distribution along these streams. Stands in the community are dominated by three tree species, six shrub species and nine herb species. Establishment of the community is dependent on climate and substrate; destruction is the result of progressive lateral stream-flow erosion. Soils are sandy loams above gravel, with pH values of 7.7 to 8.0 and soluble salt concentration of 176 to 458 parts per million. Trees in mature stands averaged 23.0 …

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 …

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.

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 …

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.

The Prairie Naturalist Volume 6, No.2. June 1974

The Prairie Naturalist

WOOD DUCKS IN NORTH DAKOTA ▪ H. A. Doty

AERIAL FEEDING BY RED-WINGED BLACKBIRDS NEAR FULLER'S LAKE, NORTH DAKOTA ▪ W. C. Royall, Jr. & O. E. Bray

ARBOREAL WOODCHUCKS? ▪ K. T. Killingbeck

IMAGES, CHOICE, AND COMMUNITY DEVELOPMENT ▪ E. Smith

BREEDING STATUS OF THE LEAST BITTERN IN NORTH DAKOTA ▪ C. L. Cink

NOTE: Maximum Sizes for Ambystomatid Salamanders ▪ D. W. Larson

Meiotic And Mitotic Chromosomes Of Fritillaria Atropurpurea Nutt., John Keith Archibald

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this paper is to provide information concerning the number, structure, and behavior of chromosomes in the plant species Fritillaria atropurpurea. The material used for this investigation included both floral buds and root-tips from actively growing naturally occurring plants collected from populations in both Utah and Nevada, and root-tips from seed germinated in the greenhouse. The results obtained include a karyotype analysis of mitotic chromosomes, a discussion of meiosis, a discussion of B-chromosomes, and a series of photographs depicting the stages of mitosis and meiosis in this species.

Fritillaria atropurpurea has a diploid chromosome number of 24, …

Nutrition Of Sheep Grazing Foothill Big Game Range In Spring, Kurt J. Kotter

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Sheep with esophageal fistulas were used to determine the daily intake, nutritive content and digestibility of forage at three periods and two stocking intensities during the spring of 1972 on a typical foothill range in northern Utah.

Heavy grazing under a season-long regime did not influence the concentrations of dietary chemical components when compared to moderate grazing; however, it did depress the digestibility of cellulose and organic matter. There was a significant decline in the dietary chemical components due to forage maturation. Digestibility of organic matter and cellulose were significantly higher in the early spring as compared to late spring. …

The Dynamics Of Root Growth And The Partitioning Of Photosynthates In Cool Desert Shrubs, Osvaldo Alberto Fernandez

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study addresses the nature of physiological and phenological evolutionary strategies of root growth dynamics and energy allocation followed by Atriplex confertifolia, Ceratoides lanata, and Artemisia tridentata growing in their natural cool desert environment.

Root observation chambers with inclined Plexiglass windows were installed in monospecific desert communities of Atriplex confertifolia, Ceratoides lanata and Artemisia tridentata. Soil temperature and water potential measurements taken immediately adjacent to the observation windows indicated a minimal disturbance was caused by the presence of these chambers. For the three species initiation of root growth was observed before initiation of shoot activity, furthermore, active root growth extended …

The Phenology And Control Of Dyers Woad (Isatis Tinctoria) In Northern Utah, William A. Varga

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this thesis is to describe dyers woad and to establish v means for control of the weed in northern Utah. Logan was chosen for studying germination of the weed, and interaction of dyers woad and alfalfa stands. Collinston was selected for screening trials of herbicides for the control of dyers woad. The thesis contains information on the phenology of dyers woad and suggestions for control of the weed.

Seasonal Changes Of Peach Flower Buds At The Ultrastructural Level, Yeh Feng

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was conducted to gain a better understanding of the seasonal changes of Gleason Elberta peach flower buds at the cellular level. Peach buds were obtained from the Howell Experiment Station in Ogden, Utah. Samples were collected at weekly intervals from October 25th, 1971 to March 29th, 1972. When a killing frost precluded further sampling, the buds were preserved by standard electron microscopic techniques. Thin sections (500 to 700 A) of the cells around the ovarious cavity were examined with a Zeiss EM-9S-2A electron microscope.

From October 25th, 1971 to January 3rd, 1972, more heterochromatin than euchromatin was in …

Anatomical Effects Of Dicamba On Pea Root Tissues, Brent George Ovard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Peas (Pisum sativum L. Var Alaska) were allowed to absorb calcium and magnesium chloride for 8 hours and then were germinated in a potassium phosphate buffer pH 6.5 for 40 hours. Peas were then treated with 0, 0.1, 0.3, or 0.5 ppm dicamba (3,6-dichloro-o-anisic acid) and harvested at 24, 48, and 72 hour intervals. The following determinations were recorded: root elongation, nuclear volume, and anatomical modifications.

Root elongation recordings showed that dicamba prevented normal root elongation. Treatments induced very short thick primary roots.

Measurements of nuclear volume indicated that all herbicide concentrations were able to reduce the …

A Study Of The Radiation Quality Under Plant Canopies In The Wave Range 0.4 To 2.5 Microns, Nolasco G. Baldazo

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The spectral distribution of the global radiation from 0.4 to 2.5 microns penetrating deciduous and coniferous canopies were measured during clear days between 10 a.m. and 2 p.m. using a double-quartz monochromator.

In the visible region (0.4 to 0.7 micron) the average relative spectral transmissions under both canopies are about one percent beginning at 0.4 micron and decreasing to about half a percent at 0.67 micron. There is only a small peak in the green (0.55 micron) transmission under deciduous stands while there is none under coniferous canopies. The slightly higher transmission in the blue (0.4 micron) is attributed to …

End Matter, Vol. 19 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 19 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 19 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 19 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Comparison Of Meteorologic Measurements From Irrigated And Non-Irrigated Plots, Provo, Ut, 1970–1972, Ferron L. Andersen, Phil D. Wright, J. Carl Fox

Brigham Young University Science Bulletin, Biological Series

A comparative study of micrometeorologic conditions on irrigated and non-irrigated pasture plots was conducted at Provo, Utah, from 1970 to 1972. Daily measurements were taken of the following: precipitation cither as rain or snow, new snowfall and total snow depth during the winter; relative humidity in a standard weather shelter; number of hours at maximum relative humidity; cloud cover each morning; potential evaporation; total wind 1 m above ground level; temperature extremes in a standard weather shelter; and temperatures both on irrigated and non-irrigated plots with sensing devices located 5 cm beneath soil surface under grass cover, at soil surface …

A Taxonomic Study Of The Western Collared Lizards, Crotaphytus Collaris And Crotaphytus Insularis, Nathan M. Smith, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

The heterogeneous nature of the collared lizards west of the Colorado River prompted this study. Samples from known populations of C. c. auriceps, C. c. baileyi, and C. c. fruscus were used as a base for defining the western populations. External morphology and cranial morphology were compared by cluster, canonical, and discriminant analyses.

Results of these analyses show a western complex of four populations which are distinct from the three base populations of the collaris complex. Members within the western complex are distinguishable with at least 90 percent reliability by discriminant analysis. Because of intergradation patterns seen in western Sonora, …

The Coastal Plain Floristic Element In Michigan, Gary J. Pierce

Masters Theses

No abstract provided.

End Matter, Vol. 19 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Taxonomy Of The Genus Chloris (Gramineae), Dennis E. Anderson

Brigham Young University Science Bulletin, Biological Series

This study is a worldwide taxonomic treatment utilizing endomorphic characters such as cytology, histology, and embryology, in addition to the traditional exomorphic features. New chromosome numbers and histological information are reported. Relationships between Chloris and other genera in the Chlorideae are discussed. A total of 56 species is recognized in the genus; each is described and illustrated. Complete synonymies are included as well as a list of unidentified or rejected names. Distributions and maps are given for each species, along with lists of specimens examined during studies at various herbaria. Reports of field studies involving introgression among certain species are …

Front Matter, Vol. 19 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Lysimetric Calibration Of The Bowen Ratio-Energy Balance Method For Evapotranspiration Estimation In The Central Great Plains, Blaine L. Blad, Norman J. Rosenberg

Department of Agronomy and Horticulture: Faculty Publications

Most reports show good agreement between evapotranspiration (ET) rates estimated by Bowen Ratio-Energy Balance (BREB) method and rates measured with lysimeters, although underestimation by the BREB model has occasionally been reported. This study was conducted to evaluate the performance of the BREB technique in the climatic conditions characteristic of the central Great Plains, a region where a significant proportion of the energy consumed by evapotranspiration is supplied from advected sensible heat.

Agreement between the BREB method and lysimetric measurements of ET is good during non-advective periods but during advective periods the BREB model underestimates ET by about 20%. Data collected …

The Prairie Naturalist Volume 6, No.1. March 1974

The Prairie Naturalist

AVIAN MORTALITY FROM COLLISIONS WITH OVERHEAD WIRES IN NORTH DAKOTA ▪ G. L. Krapu

NOTES ON THE BIOLOGY OF THE OLIVE-BACKED POCKET MOUSE PEROGNATHUS FASCIATUS ON THE NORTHERN GREAT PLAINS ▪ J. E. Pefaur & R. S. Hoffman

NOTE: Swans Resting on the Surface of A Dry Lake ▪ D. S. Gilmer

A Mode Of Action Of Herbicides: Inhibition Of The Normal Process Of Nitrite Reduction, Lowell Klepper

Nebraska Agricultural Experiment Station: Historical Research Bulletins

Herbicides were shown to interfere in the normal process of enzymatic nitrite reduction by the plant in photosynthetic and nonphotosynthetic plant tissues with little effect on nitrate reduction. This preferential inhibition caused nitrite to accumulate. The occurrence of free nitrite within the plant can help to explain the toxicity symptoms, nastic growth reactions, abnormal metabolism and rapid death due to herbicide action. This blockage of nitrite reduction was shown with all photosynthetic inhibitor herbicides tested and with numerous other herbicides. The effect was demonstrated using an in vivo assay, intact green plants and germinating seedlings. A basic in vivo method …

Development Of Prediction Relationships For Water Requirements With Irrigation Cooling, Billy J. Barfield, John N. Walker, F. A. Payne

KWRRI Research Reports

A model for predicting leaf temperatures during an off-on mist cycle is presented. The model uses a combination of energy budget and aerodynamic techniques. The model was tested for dry leaf temperature and evapotranspiration predictions using average hourly data from Arizona. The accuracy was good. It was also tested for dry leaf temperature predictions using two to three minute data with a widely varying net radiation. When reasonable values of stomatal resistance were used, the agreement was again good.

The model was tested for prediction of wet leaf temperature prediction with a ten minute on, fifty minute off mist irrigation …