Open Access. Powered by Scholars. Published by Universities.®

Organisms Commons

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 1201 - 1230 of 1243

Full-Text Articles in Organisms

Summary Of 1975 Field Experiments With Advisers: "Rape Blackleg Disease Fungicide Trials", M J. Barbetti Jan 1975

Summary Of 1975 Field Experiments With Advisers: "Rape Blackleg Disease Fungicide Trials", M J. Barbetti

Experimental Summaries - Plant Research

During 1973 and 1974 a large range of fungicide spray and seed treatment schedules were tested. The 1973 results were, on the whole, not very encouraging, but the very early post-germination spray, two weeks after germination, did indicate a possible means of control. In view of the 1973 results, in the 1974 trials fungicidal sprays were applied early, and a new method of application of fungicide to the seed, known as "prilling" was used. Using fungicide seed prills and seedless fungicide prills the idea was to have the fungicide mixed with materials which dispersed upon wetting, so releasing and making …


Time And Rate, Comparative Fungicide, Fungicide Application Method Trial, Clover Scorch Economy Demonstrations, A Bokor Jan 1975

Time And Rate, Comparative Fungicide, Fungicide Application Method Trial, Clover Scorch Economy Demonstrations, A Bokor

Experimental Summaries - Plant Research

Time and Rate Trial 75AL33 Comparative Fungicide Trial 75AL34. Fungicide Application Method Trial 75D8. Clover Scorch Economy Demonstrations 75AL35.


A Photomicrographic Guide To The Saprolegniaceae Of Illinois, Ronald L. Butler Jan 1975

A Photomicrographic Guide To The Saprolegniaceae Of Illinois, Ronald L. Butler

Masters Theses

There is a paucity of information concerning the occurrence and distribution of the Saprolegniaceae of Illinois. These fungi, commonly called "water molds", are of particular interest as many are potential parasites of fish, crustaceans, and other aquatic plant and animal life. It is of considerable interest to students of the fungi and of practical value to the fisheries biologists and environmentalists to have available a means of identification for these organisms.

This paper provides a descriptive and photomicrographic account of the Saprolegniaceae of Illinois. Included herein are dichotomous keys to the genera of this family as well as generic descriptions …


A Study Of Naturally Occurring Algicides Produced By Freshwater Algae, Denny O. Harris, Harry D. Caldwell Dec 1974

A Study Of Naturally Occurring Algicides Produced By Freshwater Algae, Denny O. Harris, Harry D. Caldwell

KWRRI Research Reports

The mode of action of the algicide produced by Pandorina morum was examined by exposing Volvox globator and isolates spinach chloroplasts to a partially purified algicide preparation. Oxygen evolution of Volvox, whole chloroplasts and broken chloroplasts (minus the Calvin cycle),was reduced indicating that the algicide inhibits the light reactions of photosynthesis. Oxygen evolution studies of other Volvocaceae confirmed the observation that Pandorina morum is not significantly influenced by its own inhibitor. Molecular weight approximation by gel filtration established that the inhibitor has a low molecular weight (probably below 100 mw). Field studies indicate that this algicide has tremendous potential as …


Metabolic Capabilities Of Sulfur Oxidizing Bacteria And Their Role In Water Pollution, M. I. H. Aleem Sep 1974

Metabolic Capabilities Of Sulfur Oxidizing Bacteria And Their Role In Water Pollution, M. I. H. Aleem

KWRRI Research Reports

This report describes investigations into the physiology of microorganisms that are commonly involved in the oxidation of inorganic sulfur compounds. The metabolic activities of these bacteria play a potent role in several fields of economic importance such as strip mining operations, water pollution, corrosion, metallurgy, petroleum technology and soil fertility processes.

The oxidation of inorganic sulfur compounds was studied in the chemolithotrophs Thiobacillus denitrificans, Thiobacillus A2, Thiobacillus neapolitanus, and a photolithotroph Rhodopseudomonas palustris. Cell suspensions from all of the thiobacilli catalyzed completely the oxidation of sulfide, thiosulfate, and sulfite to sulfate. The oxidation of thiosulfate in R. palustris …


Oral History Interview: Josephine R. Gorby, Josephine R. Gorby Jul 1974

Oral History Interview: Josephine R. Gorby, Josephine R. Gorby

0064: Marshall University Oral History Collection

Josephine Gorby was born on February 24, 1908. She began her teaching career in a one-room school in Wimmer, McDowell County, WV. In 1931 she began teaching in Lawrence County, OH. Mrs. Gorby’s interview focuses on growing up on a farm near Proctorville, OH, her experiences as an educator, her family’s experience during World War I, and the 1937 flood of the Ohio River and its tributaries. In the audio clip provided, Mrs. Gorby discusses the impact of the 1937 flood on the school house in Athalia, OH. During her interview, she also focuses on the construction and use of …


Oral History Interview: Edward C. Jackson, Edward C. Jackson Jun 1974

Oral History Interview: Edward C. Jackson, Edward C. Jackson

0064: Marshall University Oral History Collection

Edward C. Jackson was born on January 17, 1911, in Canfield, Braxton County, WV. In 1926, he moved to Fenwick, Nicholas County, WV, to pursue jobs in saw mills. In his interview, Mr. Jackson describes in great detail the design and structure of the log home he lived in as a child. He focuses on growing up on a farm and places emphasis on the type of work he did and food preparation and preservation. Mr. Jackson also discusses the tight-knit community in which he was raised. In the audio clip provided, Mr. Jackson discusses working in the lumber industry. …


Dissolution And Precipitation Of Gypsum In The Soil Under Irrigation, Badier J. Alawi May 1974

Dissolution And Precipitation Of Gypsum In The Soil Under Irrigation, Badier J. Alawi

All Graduate Theses and Dissertations

Two soils were used in this soil column study. Yolo loam soil a non- c al c areous, non-gypsiferous soil from central California and Vernal soil a calcareous soil from eastern Utah. Initial studies were conducted where the solubilities of pure CaC0 3 and CaS0 4 ' 2H 2 0 were determined in the presence of Logan river water, a KCl solution (2.8 mmhos/cm) and a K 2 S0 4 solution (Z. 7 mmhos/cm). Gypsum was more soluble in the KCl solution than in the K Z S0 4 solution. The solubility product of both gypsum and lime were determined …


A Study Of Water-Soluble Inhibitory Compounds (Algicides) Produced By Fresh-Water Algae, Denny O. Harris, Manhar C. Parekh Nov 1973

A Study Of Water-Soluble Inhibitory Compounds (Algicides) Produced By Fresh-Water Algae, Denny O. Harris, Manhar C. Parekh

KWRRI Research Reports

A complex system of growth inhibitors was observed in the green algae (Volvocaceae). Inhibitors were found in the culture filtrates of some genera which limit their own growth (autoinhibitors) while others in the family produce substances which check the growth of other genera (heteroinhibitors). These inhibitors were destroyed by autoclaving. It was decided that Pandorina morum, which produced the strongest inhibitor and Volvox tertius, the most sensitive to the inhibitor would make an excellent model system for a study of the chemical and physical properties of these naturally occurring algicides. The algicide could be removed from actively growing cultures about …


Experimentation To Develop Procedures To Be Used In The Investigation Of The Effects Of Restriction On The Unmodified Dna Of The Bacteriophage Lamda, John Haynes Jun 1973

Experimentation To Develop Procedures To Be Used In The Investigation Of The Effects Of Restriction On The Unmodified Dna Of The Bacteriophage Lamda, John Haynes

Honors Theses

The results of experimentation approximately twenty years ago with variuos bacteriophages by Ralston and Krueger16, Anderson and Felix1, Luria and Human12, and by Bertani and Weigle2 have shown that the host range of a given phage depends directly on the bacterial strain on which the phage has last propagated. This event came to be known as host-induced modification or host-controlled variation. As this phage host range is controlled by the host environment and can be altered from one generation to another it has, according to Luria, made microbiology "the last stronghold of Lamarckism" …


Potato Variety Trial As A Step Of A Potato Breeding Program, Ganzalo Claure-Vallejo May 1973

Potato Variety Trial As A Step Of A Potato Breeding Program, Ganzalo Claure-Vallejo

All Graduate Theses and Dissertations

A potato varietal trial, the equivalent of the final step in a potato breeding and testing program was conducted in 1972 at the Farmington Experimental Sub-station, Farmington, Utah. The test consisted of twelve named varieties and two numbered selections. This study measured the yielding capacity of new potato varieties and selections during one growing season at one location in Utah. Yields were compared with those of the older accepted varieties grown in the state and used as control or standard varieties in the varietal trial. This study provided valuable information for growers and processors in determining the suitability of these …


Proteolytic Enzymes Of Lactic Streptococci And Their Use In Improving Body And Texture Of Direct Acid Cottage Cheese, Gulamnabi Y. Vahora May 1973

Proteolytic Enzymes Of Lactic Streptococci And Their Use In Improving Body And Texture Of Direct Acid Cottage Cheese, Gulamnabi Y. Vahora

All Graduate Theses and Dissertations

Proteolytic activity of Streptococcus cremoris HP, P2 and AM2; Streptococcus lactis-C2, ML8 and a commercial mixed culture was determined in skimmilk and whey by measuring the increase in Absorbency at 274.5 nm of a pH 4.6 soluble filtrate, following incubation in a 2.5% casein solution. Proteolytic activity, rate of acid production and growth rate decreased in order of C2, HP, mixed culture, AM2, ML8 and P2 at a regulated pH (6.1 - 6.2) and 32 C. Maximum proteolytic activity for all cultures was found during the stationary phase …


Ice Nuclei Inventory: Wasatch Weather Modification Experimental Area, William F. Slusser May 1973

Ice Nuclei Inventory: Wasatch Weather Modification Experimental Area, William F. Slusser

All Graduate Theses and Dissertations

Several large sources of 1ce nuclei were identified for the Wasatch Weather Modification Experimental Area. When stable air masses remained over the area for several days, ice nuclei concentrations as large as 1750 per liter (measured at -20 C) were found at the surface. ConcentralX tions as large as 6000 per liter were measured with an airborne 1ce nuclei counter over the smelter industry of the Salt Lake Valley. Ice nuclei concentrations during storm periods were usually less than 3 per liter, indicating an excellent potential for increasing precipitation amounts over the Wasatch Mountains through the release of artificial ice …


Mitochondrial Activity Of Hardened And Nonhardened Rye (Secale Cereale) Plants Exposed To Freezing Temperatures, Bryce D. Bennett May 1973

Mitochondrial Activity Of Hardened And Nonhardened Rye (Secale Cereale) Plants Exposed To Freezing Temperatures, Bryce D. Bennett

All Graduate Theses and Dissertations

Five day old dark-grown seedlings of Secale cereale variety "coup;ar" p:rown at 20 C were subjected to hardening at 2 C "!.n daily increments from 0 to 7 days, to temperature stress at -5 C for 0, 1, and 3 days, and to recovery at 20 C for 0, I, and J days. Unhardened plants were killed by temperature stress but as the time of hardening increased fewer plants were killed. After 5 days of hardening all plants survived subsequent freezing stress. Mitochondria were isolated from the plants after they received various combinations of the three temperature treatments. There were …


Nutrients And Phytoplankton In Hyrum Lake, Robert Bruce Murray May 1972

Nutrients And Phytoplankton In Hyrum Lake, Robert Bruce Murray

All Graduate Theses and Dissertations

The current investigation indicates that the routine appearance of a noxious blue-green algal bloom of Aphanizomenon flos-aquae, in Hyrum Lake, a reservoir in northern Utah is a result of excess phosphorus. Data indicate that the algal growth is initiated by phosphorus liberated from the phosphorus rich bottom sediments, and at a time when nitrogen is present in excess in the lake relative to phosphorus.

Results indicate that the Little Bear River is the major source of nitrogen and phosphorus contributing to the eutrophication of Hyrum Lake. Nitrogen and phosphorus fluctuations in the Little Bear River proved to be concurrent with …


Nitrogen Movement Under Irrigated Corn As Influenced By Nitrogen Source And Rate, Douglas C. Muir May 1972

Nitrogen Movement Under Irrigated Corn As Influenced By Nitrogen Source And Rate, Douglas C. Muir

All Graduate Theses and Dissertations

The purpose of this study was to determine nitrogen movements under a fall applied fertilizer as affected by rate of application of fertilizer, type of fertilizer carrier, and by crop grown. Two nitrogen fertilizers, calcium nitrate and ammonium sulfate, were applied in the fall of 1970. The soil profile was sampled in the spring of 1971 and again in the fall of 1971. Nitrate-nitrogen from both the calcium nitrate and the ammonium sulfate applications was found to have moved significantly from the time of application to the time of spring soil sampling. Two effects from the high rate of both …


Boron Movement In Soil Columns, Joseph William Stucki May 1972

Boron Movement In Soil Columns, Joseph William Stucki

All Graduate Theses and Dissertations

Three adsorption theories--Langmuir, B.E.T., and Freundlich--were applied to boron interaction with Aiken clay loam and Vernal sandy loam soils to determine which bests describes the system.

Column studies were conducted to obtain constants related to mass fluid flow and fluid dispersion within the column. An inert ion was used to obtain the pore volume and to calculate the fluid dispersion coefficient. These data were used to solve the material balance equation by the explicit numerical method developed by Lai for a digital computer. The output from the computer was a predicted profile boron distribution within the soil column.

The soil …


Carbon And Nitrogen As Regulators Of Algal Growth In Treated Sewage, Edward G. Foree, Charles Reece Scroggin Mar 1972

Carbon And Nitrogen As Regulators Of Algal Growth In Treated Sewage, Edward G. Foree, Charles Reece Scroggin

KWRRI Research Reports

Continuous flow algal cultures were grown under three different growth conditions using secondary sewage treatment plant effluent as the growth medium. The only variable within each run was the hydraulic residence time. The concentrations of growth regulating nutrients were varied between the runs so comparisons of the algal mass, composition, nutrient uptake, and genera could be made. The importance of CO2 availability for algal growth was also studied. A kinetic theory which based algal growth on cellular nutrient concentration was verified. The second phase of the study was a batch culture study in which the same growth medium was …


Range And Optimum Growth Concentrations Of Phosphate And Nitrate For Chlamydomonas Reinhardtii, Thomas E. Hill Jan 1972

Range And Optimum Growth Concentrations Of Phosphate And Nitrate For Chlamydomonas Reinhardtii, Thomas E. Hill

Masters Theses

A study was conducted on the alga Chlamydomonas reinhardtii to determine the range and optimum growth concentrations of phosphate and nitrate. There are only a few species of algae for which this type of data is known. Inorganic nutritional data is basic to the understanding of the complexities of phytoplankton ecology and eutrophication.

The "plus" strain of this heterothallic alga was cultured in a TRIS-buffered inorganic medium with various concentrations of sodium phosphate and potassium nitrate and adjusted to a pH of 7.4. The axenic cultures were evaluated at the end of 6 days with a spectrophotometer, at a wavelength …


Factors Regulating The Growth Of Algae In Continuous Culture In Diluted Secondary Sewage Treatment Plant Effluent And Subsequent Biodegradability, Edward G. Foree, Caroline P. Wade Jan 1972

Factors Regulating The Growth Of Algae In Continuous Culture In Diluted Secondary Sewage Treatment Plant Effluent And Subsequent Biodegradability, Edward G. Foree, Caroline P. Wade

KWRRI Research Reports

Heterogeneous algal cultures were grown in laboratory continuous culture in continuous flow, completely mixed chemostats in secondary sewage treatment plant effluent diluted to give an ammonia nitrogen concentration of 10 mg/1. Variables were lighting, pH, carbon dioxide availability, and hydraulic residence time.

Optimum growth occurred under pH 7.0, excess CO2, and continuous lighting conditions. The availability of artificially supplied excess CO2 greatly increased the mass (standing crop) at steady-state over that produced under otherwise identical conditions for all residence times studied. For the case of excess CO2 availability, the nitrogen concentration in the algal cells regulated …


Metabolic Role Of Sulfates And Sulfides Producing Bacteria In Pollution Of Waters, M. I. H. Aleem Dec 1971

Metabolic Role Of Sulfates And Sulfides Producing Bacteria In Pollution Of Waters, M. I. H. Aleem

KWRRI Research Reports

Cytochrome transport particles from Nitrobacter catalyzed nitrite, ascorbate as well as NADH oxidation with concomitant phosphate esterification yielding P/0 ratios of 1.0, 0.6 and 2.0 respectively. Phosphorylation coupled to nitrite oxidation was not effected by rotenone, amytal or antimycin while 50 and 70% inhibition of the NADH-linked phosphorylation was observed in the presence of HOQNO and rotenone respectively. Cell-free extracts from Nitrobacter also catalyzed an energy-dependent reduction of NAD+ by nitrite. The reduction of cytochrome c by NŌ2 was energy-dependent which involved the reversal of electrons from cytochrome a1. The subsequent energy-linked reduction of the flavoproteins …


The Role Of D-Gluconic Acid In The Regulation Of The Synthesis Of The Enzymes Of The Entner-Doudoroff Pathway In Pseudomonas Fluorescens, Steven C. Quay Aug 1971

The Role Of D-Gluconic Acid In The Regulation Of The Synthesis Of The Enzymes Of The Entner-Doudoroff Pathway In Pseudomonas Fluorescens, Steven C. Quay

Honors Theses

Induction of Entner-Duodoroff pathway enzymes in Pseudomonas fluorescens was investigated to study the role of gluconate as a possible inducer. Glucose oxidase-deficient mutants were isolated and characterized. One of these mutants, gox-7, was deficient in particulate glucose oxidase; another mutant, gox-17, was deficient in particulate glucose and gluconate oxidase activities. Gluconate, but not glucose, induced synthesis of gluconokinase and 6-phosphogluconate dehydratase in both mutants. High constitute levels of 2-keto-3-deoxy-6-phosphogluconate aldolase were found when both mutants were grown on glucose. Growth of parent and both mutant strains on glycerol also resulted in high levels of Entner-Doudoroff pathway enzymes. It was concluded …


Algal Growth And Decomposition: Effects On Water Quality, Phase Ii, Edward G. Foree, Ronald L. Barrow Oct 1970

Algal Growth And Decomposition: Effects On Water Quality, Phase Ii, Edward G. Foree, Ronald L. Barrow

KWRRI Research Reports

The decomposition and associated nutrient regeneration of three unialgal cultures and one mixed culture containing an indigenous population of bacteria and microscopic animals were studied under dark, constant temperature laboratory conditions. After periods of nutrient-deficient growth ranging from O to 30 days, these cultures were inoculated with decomposer populations and subjected to anaerobic and aerobic environments for the decomposition studies. The extend of decomposition was determined from the percentage volatile suspended solids and percentage particulate COD remaining after 200 days of decomposition. The average extent of decomposition was greater for aerobic than for anaerobic conditions. However, significant portions of the …


Algal Growth And Decomposition: Effects On Water Quality, Edward G. Foree, John S. Tapp Jr. Mar 1970

Algal Growth And Decomposition: Effects On Water Quality, Edward G. Foree, John S. Tapp Jr.

KWRRI Research Reports

The chemical composition of algae grown in batch culture depends mainly on environmental conditions, nutrient availability, presence of predators, cell age, and species. The effects of nutrient availability and cell age on the composition of three unialgal cultures (algae + bacteria) and one hetergeneous culture (algae + bacteria + microscopic animals) were evaluated. The cultures were grown in batch culture under both nutrient-abundant and nutrient deficient conditions and the changes in compositions were observed. Luxurious uptake where nutrients are incorporated into cellular protoplasm at levels greater than those necessary for growth, and super-luxurious uptake, where some nutrients are stored rather …


The Overwintering Of The Fireblight Bacteria Outside Of Living Tissue In Utah, Sherman Thomson May 1969

The Overwintering Of The Fireblight Bacteria Outside Of Living Tissue In Utah, Sherman Thomson

All Graduate Theses and Dissertations

The purpose of this investigation was to determine the sites of overwintering of Erwinia amylovora (Burrill) Winslow et al . outside of living tissue in Utah. Bacterial isolates were taken from the surfaces of blighted twigs and mummified fruits remaining on the tree; also from internal dead tissue of blighted twigs and mummies, and from soil beneath blighted trees. Each isolate was tested for agglutination with antiserum specific for Erwina amylovora, susceptibility to Erwinia amylovora bacteriophage, production of symptoms in pear seedlings and development of bacterial ooze on green pears.

Both virulent and avirulent isolates were taken from all sites …


Mastitis : Prevention And Control. 3. Implementing The Mastitis Control Programme, F C. Wilkinson Jan 1965

Mastitis : Prevention And Control. 3. Implementing The Mastitis Control Programme, F C. Wilkinson

Journal of the Department of Agriculture, Western Australia, Series 4

FARMERS who have followed the first two articles in this series should by now have established the recommended milking routine and be familiar with it.


A Study Of Puccinia Graminis And Cronartium Ribicola, Duane W. Hughes Aug 1963

A Study Of Puccinia Graminis And Cronartium Ribicola, Duane W. Hughes

Graduate Student Research Papers

It was the purpose of this study (1) to review the literary history of rusts in the United States and in the Northwest in particular, ( 2) to learn where rusts generally are found geographically, (3) to gain further information regarding the etiology of wheat rust (Puccinia graminis tritici), of white pine blister rust (Cronartium ribicola) and to become enlightened on other rusts, (4) to learn ways of controlling the two rusts, black stem rust of wheat and white pine blister rust, and to gain an appreciation of the economic importance of rust prevention.


A Survey Of Typical And Atypical Mycobacteria Isolated From Human Specimens, Joseph Paul Truant Jun 1963

A Survey Of Typical And Atypical Mycobacteria Isolated From Human Specimens, Joseph Paul Truant

Henry Ford Hospital Medical Journal

No abstract provided.


Unusual Bacterial Isolates Obtained From A Variety Of Clinical Specimens, J. P. Truant Mar 1963

Unusual Bacterial Isolates Obtained From A Variety Of Clinical Specimens, J. P. Truant

Henry Ford Hospital Medical Journal

No abstract provided.


Absence Of Pasteurella Pestis In The Wildlife Of Arkansas, R. Reece Corey, Leo J. Paulissen, Delbert Swartz Jan 1963

Absence Of Pasteurella Pestis In The Wildlife Of Arkansas, R. Reece Corey, Leo J. Paulissen, Delbert Swartz

Journal of the Arkansas Academy of Science

No abstract provided.