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The Effects Of Enzymes On Activated Sludge Floc, Terry Lee Stoddart

Retrospective Theses and Dissertations

Dialysed activated sludge was used as a substrate to test for enzymes which can hydrolyse activated sludge floc. Two hundred and fifty aerobic and anaerobic microorganisms were tested against activated sludge for the presence of hydrolytic enzymes. These included known genera and organisms obtained by various enrichment procedures. Anaerobic digester mixed liquor was contacted with activated sludge agar under anaerobic conditions. None of the microorganisms present in the digester liquor hydrolysed the floc. The following commercial enzymes were contacted with activated sludge singly, in combination, and sequentially under various physical and chemical conditions: protease, lipase, cellulose, pectinase, phospholipase C, trypsin, …

Visual Detection Of Cryptic Prey By Blue Jays (Cyanocitta Cristata), Alexandra T. Pietrewicz, Alan Kamil

Avian Cognition Papers

Blue jays learned to respond differentially to the presence or absence of Catocala moths in slides. This detection of the moths by the jays was affected by the background upon which the moth was placed and its body orientation, thus providing an objective measure of crypticity. These procedures are useful for the study of visual detection of prey.

Ak-Sar-Ben Beef Seminar Ill, Knights Of Ak-Sar-Ben

University of Nebraska Historical Extension: Bulletin

Opening Remarks - Mr. Robert G. Volk

"Objectives of 4-H" - Dr. William E. Caldwell

Moderator's Remarks - Dr. Frank H. Baker

"Carcass Characteristics of Various Breed Crosses" — Dr. Robert Koch

Production Committee Report - Mr. Chuck Schroeder

Judges Committee Report - Dr. Miles McKee

Marketing and Distribution Report - Mr. Carl Gardner

Education Committee Report - Dr. Joe Hughes

Summary of Ak-Sar-Ben Beef Seminar III - Moderator

News Release on Ak-Sar-Ben Beef Seminar III

Vertical Drainage In Field Cores, Larry G. Wells, R. W. Skaggs

Biosystems and Agricultural Engineering Faculty Publications

No abstract provided.

The Years 1960–1977, Lee W. Lenz

Aliso: A Journal of Systematic and Floristic Botany

In the years 1960–1977, Rancho Santa Ana Botanic Garden fully embraces its role as teaching institution and as advocate and guardian of the native California flora. Expansion of the living collection, landscaping of the grounds, public education, herbarium and library activities, and publication output are detailed. To accommodate a growing number of graduate students, the faculty—consisting of Richard K. Benjamin, Sherwin Carlquist, and Lee. W. Lenz—is joined by Peter H. Raven, Ronald Scogin, John P. Simon, and Robert F. Thorne.

Index Volume 9, Issue 1 (Golden Aliso)

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Jack Pine And Aspen Forest Floors In Northeastern Minnesota, Robert M. Loomis

Aspen Bibliography

Characteristics of upland forest floors under mature jack pine and aspen in northeastern Minnesota were investigated.

Biomass Estimation For Some Shrubs From Northeastern Minnesota, David F. Grigal, Lewis F. Ohmann

Aspen Bibliography

Biomass prediction equations were developed for 23 northeastern Minnesota shrub species. The allometric function was used to predict leaf, current annual woody twig, stem, and total woody biomass (dry grams), using stem diameter class estimated to the nearest 0.25 cm class at 15 cm above ground level as the independent variable.

Natural Regeneration Of Northern Hardwoods In The Northern Great Lakes Region, Carl H. Tubbs

Aspen Bibliography

The forest types collectively known as "northern hardwoods" (Quigley and Babcock 1969) occupy nearly 100 million acres in eastern North America.

Some Individual Plant Biomass Values From Northeastern Minnesota, Lewis F. Ohmann, David F. Grigal

Aspen Bibliography

No abstract provided.

Forest Insect And Disease Management : Aspen Mortality At The Maroon Lake Campground, David W. Johnson, Thomas E. Hinds

Aspen Bibliography

At the request of the White River National Forest, Dave Johnson, Plant Pathologist, FI&DM and Tom Hinds, Plant Pathologist, RMFRES, made an evaluation of aspen mortality in the Maroon Lake Campground, Aspen Ranger District during June 13 to 15, 1977. Previously, Hinds (1976) reported accelerated aspen loss in 17 campgrounds, including Maroon Lake, located throughout Colorado and New Mexico (Fig. 1).

Aspen Mortality At The Maroon Lake Campground, Aspen Ranger District, White River National Forest, David W. Johnson, Thomas E. Hinds, G.L. Downing, F.A. Dorrell

Aspen Bibliography

No abstract provided.

The Distribution, Variation, And Natural History Of The Middle American Highland Pitvipers, Bothrops Barbouri And Bothrops Godmani, Jonathan Atwood Campbell

Biology Faculty Publications - Archive

Ecological limiting factors, morphological characteristics, and life history data were used to explain the possible origin, dispersal, and present distribution of Bothrops godmani and B. barbouri. Museum specimens were examined in detail and field investigations were carried out from 1973 to 1976 for a period totaling approximately four months. Bothrops barbouri is distributed at elevations above 2400 meters in cloud forest and at higher elevations in mesic fir-pine-oak forests in Guerrero, Mexico. Bothrops godmani is distributed from southeastern Oaxaca, Mexico, to Chiriqu (Province, Panama, at elevations exceeding 1500 meters. This species inhabits a variety of forest types ranging from mesic …

Home Range And Movements Of Fox Squirrels (Scirius Niger) In East Central Illinois, Sheryl L. Dyer

Masters Theses

No abstract provided.

Ecology Of A Mixed Gray And Fox Squirrel Population, Thomas R. St. Peter

Masters Theses

No abstract provided.

Studies On The Grooming Behavior And Morphology Of The Freshwater Prawn, Palaemonetes Kadiakensis, Bruce E. Felgenhauer

Masters Theses

No abstract provided.

Blood Parasites Of Squirrels From Coles And Lake Counties In Illinois, Nicholas I. Obiri

Masters Theses

Hepatozoon and microfilariae are described from the blood of fox and gray squirrels captured in Coles and Lake Counties in Illinois during 1976 and 1977. The hepatozoon species is identified as Hepatozoon griseisciuri on the basis of parasite morphology and hosts. A higher rate of infection (35.7% : 11.1%) was observed in gray squirrels than in fox squirrels and more adults were infected than juveniles. No microfilariae were found in gray squirrels but fox squirrels had a 57.1% infection rate with no difference based on age. The observed microfilariae are similar to that described by Davidson from Maryland gray squirrels …

A Stream Survey Of Riley Creek, Coles County, Illinois, Using Macroinvertebrates As Indicators Of Organic Pollution, Joseph R. Rowe

Masters Theses

A stream survey of Riley Creek in Coles County Illinois, was undertaken to determine ecological trends and the qualitative status of the aquatic community throughout the course of the stream.

The survey encompassed the entire length of Riley Creek from the area of its status as an intermittant waterway to its confluence with Cassel Creek. Sampling periods included the months of April, May, June, July, October and November.

Macroinvertebrate collections were made at six locations along the stream approximately equidistant from each other. The organisms were assigned tolerance levels as designated by the Illinois Environmental Protection Agency.

Physical and chemical …

Cytology Of Chaetomidium Fimeti, David D. Kimmel

Masters Theses

No abstract provided.

Cytological Investigations Of Eremosphaera Viridis De Bary, Richard Allen Valentino

Masters Theses

Eremosphaera viridis de Bary was studied with light microscope techniques to determine the method of cytokinesis and to explain the ontogeny of the membranous ring separating the mature daughter cells in the intact sporangium.

It is proposed that cytokinesis in this organism is phylogenetically advanced and that the separation of mature daughter cells involves the sequential deposition of two cell walls. The first wall develops centripetally by the addition of membrane subunits. The resulting cleavage furrow is oriented by transverse microtubules found along the cell division plane. The newly formed walls separate the two daughter cells and give rise to …

Electron Microscopy Of Fibers And Discs Of Hemoglobin S Having Sixfold Symmetry, M. Ohtsuki, S. White, Elmar Zeitler, Tom Wellems, S. Fuller, Martin Zwick, Marvin Makinen, Paul Sigler

Complex Systems Faculty Publications and Presentations

Aggregated forms of deoxyhemoglobin S were examined with a field emission transmission electron microscope. Images of isolated helical fibers were obtained from sickled cell lysates stained directly on the electron microscope grid. Optical and digital analyses of the electron micrographs showed that the fibers are similar to those characterized by J.T. Finch, M. F. Perutz, J. F. Bertles, and J. Dobler [(1973) Proc.NatL Acad. Sci. USA 70, 718-7221 in that they consist of stacked discs each composed of six hemoglobin molecules. The fibers exhibit an outer diameter of 160-170 A and an inner diameter of about 60 A with an …

Appendix Ii, Lee W. Lenz

Aliso: A Journal of Systematic and Floristic Botany

Appendix II lists the names and dissertation titles of 32 students in the botany program jointly administered by Rancho Santa Ana Botanic Garden and Claremont Graduate School/Pomona College who received a doctoral degree in botany between 1954 and 1977.

Louisiana Agriculture Magazine, Winter 1977-1978, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Nutrient Transport In Surface Runoff And Interflow From An Aspen-Birch Forest, D.R. Timmons, E.S. Verry, R.E. Burwell, R.F. Holt

Aspen Bibliography

No abstract provided.

A Survey Of Soil Invertebrates In Two Aspen Forests In Northern Minnesota, T.L. Wagner, W.J. Mattson, J.A. Witter

Aspen Bibliography

Productivity of ecosystems depends to a large extent on the quantity of available nutrients. In natural ecosystems, much of the nutrient stock is unavailable because it is bound in live and dead organic matter. Additions to the pool of available nutrients come from several sources, but the largest and most important one is dead organic matter. Therefore, the productivity of ecosystems is often said to be related to the rate of nutrient release from, or the mineralization of, organic litter (Ghilarov 1971, Satchell 1974).

Biomasse D'Un Peuplement De Peuplier Faux-Tremble Age Six Ans, René Doucet

Aspen Bibliography

The establishment of an experiment designed to study the effect of thinning and fertilization in a 6 year-old trembling aspen stand, provided the opportunity to determine the mass of the standing crop present at the age.

Inactivation Of Brain Hexokinase By An Adenosine 5'-Triphosphate Analog, Subbarao Bondada, Umakant W. Kenkare

Microbiology, Immunology, and Molecular Genetics Faculty Publications

An analog of ATP, 6-mercapto-9+nribofuranosylpurine 5’-triphosphate (SH-TP), functions as a phosphoryl donor for the reaction catalyzed by hexokinase. Incubation of the enzyme with millimolar concentrations of this reagent led to its rapid inactivation. However, the corresponding monophosphate derivative of this reagent was much less effective. A plot of the initial rate of inactivation versus the concentration of SH-TP exhibited saturation, suggesting the formation of a reversible complex between the enzyme and SH-TP prior to the inactivation reaction. The dissociation constant of this enzyme-inhibitor complex was the same as the K, of this reagent with respect to hexokinase in the phosphoryl …

The Effects Of Forebrain Ablations On Some Behaviors In Xenopus Laevis, Lawrence Paul Kunstadt

Dissertations, Theses, and Capstone Projects

In order to further elucidate the hypothesis that the telencephalon of ectothermic vertebrates functions primarily as a non-specific arousal mechanism, facilitating lower brain areas, (the Arousal Hypothesis) the South African clawed frog, Xenoous laevis, was studied in four behavioral situations before and after telencephalon ablation, olfactory bulb ablation or sham surgery. Particular attention was paid to measurements of the temporal aspects of the behaviors studied.

The behaviors studied were:

1. Habituation to an acoustic-vibratory stimulus

2. The optomotor response

3. Escape from shallow water

4. Feeding behavior

In the habituation experiment no changes were found in the number of …

Karyotypes Of Shrews Of The Genera Cryptotis And Blarina (Mammalia: Soricidae), Hugh H. Genoways, James C. Patton Iii, J. R. Choate

University of Nebraska State Museum: Mammalogy Papers

Cryptotis parva has a diploid number of 52 and a fundamental number of 50. Blarina brevicauda in Nebraska and Pennsylvania has a diploid number of 49 or 50 and a fundamental number of 48. Blarina carolinensis in Nebraska and Kansas has a diploid number of 52 and a fundamental number of 62. The X-chromosome in all 3 species is a large metacentric chromosome. The Y-chromosome is a small acrocentric in Blarina, whereas in Cryptotis it is a small subtelocentric.

Channel Catfish Virus Disease, John A. Plumb

United States Fish and Wildlife Service: Publications

Channel catfish virus disease (CCVD) is an acute infection of cultured fry and fingerling channel catfish (Ictalurus punctatus). The causative agent is the channel catfish virus (CCV) , a member of the herpesvirus group. Since its first identification (Fijan 1968) the virus has been isolated from infected fish collected during epizootics at catfish hatcheries in the warmer latitudes of the United States. The disease is found primarily during the summer and, with a single known exception to date, in fish less than 4 months old. The virus has been isolated only from fish taken while an epizootic was …