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Edging Toward Extinction: The Status Of Wildlife In Latin America, Douglas R. Shane

eBooks

No abstract provided.

Coastal-Trapped And Frontal-Trapped Waves In A Continuously Stratified Western Boundary Current - A Contribution To The Gulf Stream Meanders Experiment, Mark E. Luther, John M. Bane

Marine Science Faculty Publications

The effects of a realistic western boundary current on the alongshore propagation of sub-initial waves trapped by a sloping bottom topography are studied using a numerical model incorporating realistic bottom topography and a current field which is in thermal wind balance with the density field. This models the Gulf Stream as it flows along the continental slope off North Carolina. The mean state velocity and density fields do not vary alongshore and are continuous in the horizontal as well as the vertical. The linearized, inviscid equations of motion for small amplitude disturbances yield a single governing equation for the perturbation …

It Pays To Test Your Irrigation Pumping Plant, George C. Morin, Deon D. Axthelm, Laverne E. Stetson, Paul Fischbach, Dean Eisenhauer, James R. Gilley, Wayne F. Kroutil, Walter L. Trimmer

University of Nebraska-Lincoln Extension: Historical Materials

A pumping plant performance test can determine the energy efficiency of an irrigation pumping plant and provIde information on adjustments needed to improve energy efficiency. The performance of an irrigation pumping plant should be evaluated by trained personnel using accurate testing equipment. This service can be performed by consulting engineers, by many well drilling companies, and some Natural Resources Districts and Public Power Districts. See your County Extension Agent for more information concerning these services.

A pumping plant test should be performed regardless of the age of your system. Test all new systems so that you can be assured that …

Vole Population Cycles: A Case For Kin Selection?, Eric Charnov, J.P. Finerty

Biology Faculty & Staff Publications

Kin selection, as evidenced by aggression between individuals with a low coefficient of relation, may be a significant contributing factor in vole population cycles. Demographic and behavioral studies support this idea.

Sex Change In Plants: Old And New Observations And New Hypotheses, D.C. Freeman, K.T. Harper, Eric Charnov

Biology Faculty & Staff Publications

Evidence is presented that individuals of a large number of dioecious and subdioecious plant species are able to alter their sexual state in response to changes in the ambient environment and/or changes in size or age. We suggest that lability of sexual expression probably has survival value where a significant portion of the females must otherwise bear the cost of fruit production in unfavorable environments. We demonstrate that in patchy environments of the proper scale and variability in quality, labile sexual expression will enhance an individuals genetic contribution to the next generation.

Soil Microfungal Relationships Associated With Grassland Reestablishment, Dennis C. Clarke

Electronic Theses and Dissertations

The mixed prairie association has a characteristic soil microfungal flora associated with the cover vegetation (Clarke and Christensen, 1980). Rhizosphere organisms are correlated with the cover vegetation (Christensen, 1969) and a change in the cover vegetation should be accompanied by a change in the organisms in the rhizosphere. Some disturbances that may lead to change in the cover vegetation are tillage, grazing, interseeding, mowing and fires. Christensen's (1980) review of species diversity and dominance in fungal communities indicates that in general these disturbances tend to reduce soil microfungal diversity while increasing the frequency of the remaining species. Other studies have …

A Guide To The Threatened And Endangered Vascular Plants Of The Lake Mead National Recreation Area, James S. Holland, Wesley E. Niles, Charles L. Douglas, Dennis R. Schramm

Publications (WR)

This illustrated guide was prepared to provide the botanical community, land managers, and other interested persons with a reference that describes and locates the twelve plant taxa currently being considered by the Fish and Wildlife Service for threatened or endangered status in or around the Lake Mead National Recreation Area. The guide is intended to assist managers of government agencies in determining the presence of these species and in defining management programs for their protection. The guide should be consulted prior to any construction project. If a potential conflict is identified, an onsite evaluation should be conducted early in the …

Influence Of Dredging And High Discharge On The Ecology Of Black Canyon, Larry J. Paulson, Theron G. Miller, John R. Baker, U.S. Water And Power Resources Service

Publications (WR)

The Water and Power Resources Service is considering dredging in Black Canyon to create a larger forebay to accommodate higher peak discharges and reverse flows for proposed modifications to Hoover Dam. The Black Canyon area from Hoover Dam to Willow Beach supports a heavily utilized trout fishery and is important habitat for the razorback sucker (Xyrauchen texanus) and possibly bonytail chub (Gila elegans). The Water and Power Resources Service initiated this investigation to determine what effect dredging and higher peak-discharges would have on the ecology of Black Canyon.

Studies On Amyloodinium Ocellatum (Dinoflagellata) In Mississippi Sound: Natural And Experimental Hosts, Adrian R. Lawler

Gulf and Caribbean Research

Four species of parasitic dinoflagellates have been found to occur naturally on the gills and fins of Mississippi Sound fishes: Amyloodinium ocellatum (Brown 1931) Brown and Hovasse 1946, Oodinium cyprinodontum Lawler 1967, and two undescribed species. Sixteen of 43 species of fishes examined had natural gill infections of A. ocellatum. Seventy-one of 79 species of fishes exposed to A. ocellatum dinospores were susceptible, and succumbed, to the dinoflagellate. Eight did not die even though exposed to numerous dinospores. The most common signs in an infested fish were spasmodic gasping and uncoordinated movements. Trophonts of A. ocellatum were found on …

Benthic Macroinvertebrates In A Hydrilla Infested Central Florida Lake, Stefani L. Scott

Retrospective Theses and Dissertations

Benthic macroinvertebrates and physicochemical parameters were monitored simultaneously with hydrilla in a central Florida lake. Changes in the benthos were described in relation to plant growth. Twenty-seven of the 54 taxa of benthic macroinvertebrates collected were members of the Family Chironomidae. Chironomids and oligochaetes numerically dominated the benthos, comprising of 82% of the individual collected. The greatest numbers of species and individuals were found during the winter when hydrilla biomass was low. Hydrilla biomass ranged from 0.385 kg/m2 in April, 1977 to 2.275 kg/m2 in October, 1977. Low numbers of species and individuals were collected from bottom sediments during summer …

Occurrence And Characteristics Of Nonfruiting Myxobacteria Isolated From Pine Forest Soils, Paul M. Kulvi

All Master's Theses

A study was conducted to contribute to the taxonomy of the nonfruiting myxobacteria and to determine the effects of fire on the occurrence and characteristics of nonfruiting myxobacteria isolated from pine forest soil Three years after a prescribed burn, the population of nonfruiting myxobacteria was decreased in the burn site. The organisms isolated were distinct from any of the known species of nonfruiting myxobacteria, and apparently are new species.

The Structures Of Scientific Relativism, Charles J. Dougherty

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Few recent works have generated as much intellectual discussion as Thomas S. Kuhn's The Structure of Scientific Revolutions. Yet given the impact this book has had on our understanding of science-its role in the demise of logical positivism, in the current outpouring of interest in the history of science, and in changes in science education - perhaps it is time now, some ten years after Kuhn's provocative Postscript, for still another look at his thesis. That is the purpose of this study. First, those elements of Kuhn's book which committed him to a scientific relativism are reconstructed. Secondly, …

York County Extension Homemakers' Council Records - Accession 326, Extension Homemakers, York County

Manuscript Collection

This collection is a valuable source on home demonstration work in York County in the twentieth century. The inclusive dates for a particular series may vary and for most series the records are incomplete. The collection contains records of the organization including historical information, constitutions, correspondence, minutes, reports, program notes, photographs, newsletters, and other records.

An Analysis Of The Fit Of The Negative Binomial Distribution To Frequencies Of Episodes Of Illness, Philip Melville Brennan Jr.

Theses and Dissertations

In recent years, much interest has been shown in "modeling," or fitting, primary care data to known statistical distributions. Specifically, much work has been done in studying the distributions of episodes of illness and consultations in family practices. This thesis will examine the utility of the negative binomial distribution's fit to family practice data.

The Classification Of Tumors By John Abernethy Early In The Nineteenth Century, Anne J. Krush

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

John Abernethy was born in London on April 3, 1764, the second son of five children of John and Elizabeth (Weir) Abernethy, both from Northern Ireland and of Scottish descent. The father of our John Abernethy was a merchant in the firm of Abernethy and Donaldson in London. His father and grandfather before him, both named John Abernethy, had been "Protestant dissenting ministers in Northern Ireland." John's father decided on medicine and surgery as a career for him, although some biographers felt that with his extraordinarily retentive memory he would have succeeded equally well, or better, in a law career. …

The Feasibility Of Processing Fish Aboard The F/V Friesland, Thomas Dykstra

Marine Affairs Theses and Major Papers

Many social, economic and regulatory changes have been occurring in the New England fishing industry over the past few years. These changes demand responses from the individual industry participants. The purpose of this paper is to look at the feasibility of processing onboard the F/V Friesland, as an individual response, in an effort to increase the ex-vessel price of fish resulting in the maintenance of a gross stock and a life style. The F/V Friesland, built in 1978, is an 87 foot stern trawler which participates in the mixed species groundfshery of New England out of the port of Pt. …

Communication And Social Behavior Of Captive Slow Lorises (Nycticebus Coucang), Roberta N. Chinn

University of the Pacific Theses and Dissertations

Communication and. social behavior of a prosimian primate, Nycticebus coucang, were studied to gain a better understanding of communication and social behaviors of the Order Primates. Four adult females, two adult males, and one juvenile male were the subjects for the study. The focal animal technique was used to observe communicative and social behavior. Vocal behaviors were sonagraphically analyzed. Probability of occurrence was calculated for all behavior categories observed. Conditional probabilities were calculated for the eight most frequently occurring behaviors in a lag sequential analysis. Results of the probability of occurrence analysis showed that agonistic behaviors occurred rarely or …

New Host And Locality For Kathlania Leptura (Rudolphi) (Nematoda: Oxyurata: Kathlanidae), Daniel R. Brooks, Jack Frazier

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Marine testudines are known to host two species of kathlanid nematodes, Kathlania leptura (Rudolphi, 1819) Travassos, 1918 and Tonaudia tonaudia (Lane, 1914) Travassos, 1918, Each species has been reported infrequently but exhibits a wide geographic distribution. Both K. leptura and T. tonaudia have been reported from Ceylon and from the Mediterranean Sea near Egypt, and K. leptura has been reported also from the coast of Brazil (Skrjabin, Shikhobalova, and Lagodovskaya, 1964, in Skrjabin (ed,) Essentials of Nematodology, vol. 13, part 3, Academy of Sciences of the USSR, English translation, 1976, TT75-50011, U.S. Department of Commerce, NTIS, Springfield, Virginia 22151), This …

Storage And Use Of Glycogen By Juvenile Carcinonemertes Errans, D. Mitchell Wolgamott

Dissertations and Theses

Juvenile C. errans do not feed on particulate matter and yet they can survive, apparently unchanged, for several months before maturing into the adult stage which feeds on the eggs of Cancer magister. The significance of glycogen as an energy source for maintenance of the juvenile form was investigated.

Comparison Of Electron Microscopy And Immunoelectron Microscopy With The Enzyme-Linked Immunosorbent Assay For The Detection Of Rotavirus And Antibody To The Virus, Maria Del Carmen Monedero

Biology ETDs

Rotavirus has been shown to be an etiological agent of acute gastroenteritis, in human infants and children and in young animals, such as mice, calves, lambs, and pigs. Bovine, porcine, simian (SA-11) rotaviruses and the “0” agent (sheep, goat) have been cultivated in cell cultures. To date the human rotavirus has been propagated only in fetal intestine organ cultures, where it has lost infectivity after a few passages. For this reason, methods of detection of the human rotavirus and serological tests for antibodies to it have been difficult to develop. At the present time there are several techniques that are …

Distribution Of Plutonium In Beagle Dog Liver, Jeffery M. Gearhart

Biology ETDs

Plutonium that reaches the systemic circulation by inhalation, ingestion or through cuts or abrasions is preferentially deposited in the liver and bone. Liver cancer may be an important late effect of this deposition. This study was designed to provide improved quantita­tion of the distribution of plutonium deposited in liver as a result of gradual introduction into the blood by absorption from the lung, com­pared with the immediate introduction by intravenous injection of a soluble form. In this study, Beagle dogs were exposed to an aerosol of ²⁸⁰Pu0₂ or an intravenous injection of ²³⁸Pu or ²³⁹Pu-citrate. Animals …

The Effect Of Corticosteroid Therapy On Lung Immunity Following Localized Deposition Of Antigen In Lungs Of Beagle Dogs, Dorothy Victoria Leyva Harris

Biology ETDs

Inhaled toxic materials can interact with lymphoid tissues of the respiratory tract resulting in altered immune responses. To test the effect of immunosuppression on lung immunity, corticosteroids were administered to Beagle dogs systemically or directly into the lung. Specific lung airways were lavaged at 5, 7, 10, and 12 days after intra­pulmonary immunization with sheep red blood cell (SRBC) antigen. The cytology of the bronchoalveolar cells in lung lavages was evaluated, and lymphoid cells isolated from lung airways and from blood were tested by the Cunningham assay for in vitro production of antigen-specific IgM and IgG antibodies. In addition, the …

Respiratory Patterns And Oxygen Uptake In The Garter Snake, Thamnophis Elegans, James Whitney Hicks

Biology ETDs

Eight garter snakes, Thamnophis elegans, were collected in northern New Mexico during July and August. The snakes were kept in an environmental chamber and were entrained to a 141 (0630-2030 h) / 10D (2030-0630 h) cycle for five weeks at 25 C. Ventilation was monitored with a head/body plethysmograph. Pulmonary oxygen uptake was measured by open-system respirometry. Heart rate was recorded with electrodes implanted subcutaneously, bi-lateral to the heart. Ventilation, oxygen uptake and heart rate were measured simultaneously at 25+-1 C. All measurements were recorded continuously for 48-96 hours. As well as investigating the diurnal rhythms of ventilation, oxygen uptake …

Lectin Stimulated Human Neutrophil Migration And Cap Formation, Cynthia J. Kuehn

Biology ETDs

Neutrophils have been described as the secretory organ of the inflammatory response (1) and are the main effector cells in host defense against acute bacterial infection (2,3,4,5). However, the mechanism by which cells move directionally toward or away from an inflammatory focus is a biological phenomenon which is poorly understood. Chemotaxis, directional migration, has been defined as a change in the direction of locomotion of a cell or organism, initiated by substances in the environment (6). Chemokinesis, on the other hand, is a change in speed or frequency of turning in randomly moving cells, induced by substances in the environment …

Bulletin No. 24: Garden Guide To Woody Plants: A Plant Handbook, Sally L. Taylor, William A. Niering

Bulletins

100 pp. 1979. Lists and descriptions of over 500 different trees and shrubs useful for landscaping

Review Of "Case Studies In Genetics" By M. A. Tribe, I. Tallan, And M. R. Eraut, John B. Jenkins

Biology Faculty Works

No abstract provided.

Front Matter

Henry Ford Hospital Medical Journal

No abstract provided.

Southeast South Dakota Experiment Farm Annual Progress Report, 1979, Agricultural Experiment Station

Agricultural Experiment Station and Research Farm Annual Reports

This nineteenth annual report of the research program at the Southeast South Dakota Experiment Farm has special significance for those engaged in agriculture and the agriculturally related businesses in the nine county area of southeast South Dakota. Reports in this document include information on: temperatures and precipitation data, corn breeding and performance, soybean research and planting, crop rotation, and pest control.

The Effects Of Varying Levels Of Dietary Linoleic Acid On Serum Cholesterol And Hdl-Cholesterol In Healthy Male Subjects, Donna Miller Davidge

Loma Linda University Electronic Theses, Dissertations & Projects

Sixteen healthy male subjects were randomly divided into four equal groups and fed a nutritionally balanced 30 calories % fat diet, with approximately 2500 calories and less than 15 mg cholesterol/day, for 28 days. Within each group a constant level of linoleic acid was given for the duration of the study--either 2, 6, 14 or 18 % linoleic acid. Rate of changes in total cholesterol, HDL cholesterol and the ratio of total to HDL-cholesterol were subjected to analysis of variance and regression analysis. The results showed changes in total cholesterol and ratio of total to HDL-cholesterol to be significant. The …

Patterns Of Fetal Lamb Regional Cerebral Blood Flow During And After Prolonged Hypoxia, Stephen Ashwal, John S. Majcher, Nestor Vain, Lawrence D. Longo

Loma Linda University Electronic Theses, Dissertations & Projects

[Abstract not included]

Speculation: In the fetal lamb during prolonged intrauterine hypoxia, total and regional cerebral blood flows increase to the same extent without evidence of preferential shunting to critical brainstem or subcortical areas. Neuropathologic studies have indicated relative sparing of these areas during similar animal experimental or human neonatal conditions. This suggests that the pattern of hypoxic ischemic insult to the neonatal central nervous system associated with asphyxia may differ from that produced by hypoxia alone. In addition, during asphyxia these pathologic changes may result primarily from hypotension and decreased regional cerebral blood flow, or from regional metabolic derangements …