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Theses/Dissertations

1994

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Articles 1 - 30 of 303

Full-Text Articles in Life Sciences

Indicators Of Nutrient Limited Plankton Growth In Lakes Near Mount Saint Helens, Washington, Kurt Davis Carpenter Dec 1994

Indicators Of Nutrient Limited Plankton Growth In Lakes Near Mount Saint Helens, Washington, Kurt Davis Carpenter

Dissertations and Theses

Several lakes located in the blast zone of the 1980 eruption of Mount St. Helens were studied to determine if the plankton in the lakes were limited in their growth by nitrogen or phosphorus availability. Long term nutrient enrichment experiments were performed on lake water from five lakes and measures of chlorophyll-a, carbon fixation, and nutrient uptake were used to evaluate the extent of limitation. Nutrient concentrations, ratios, and uptake from 14 lakes provided additional evidence for limitation by nitrogen and/or phosphorus. The physical, chemical, and biological characteristics of the lakes were also examined to monitor the return of ...


Opioid-Induced Ocular Hypotension: Actions At Pre- And Postjunctional Sites, Duanran Wang Dec 1994

Opioid-Induced Ocular Hypotension: Actions At Pre- And Postjunctional Sites, Duanran Wang

ETD Collection for AUC Robert W. Woodruff Library

This study examined the ocular actions of an opioid agonist. Experiments were performed to evaluate the effects of DPDPE ([D-pen2, D-pen5] enkephalin), a delta opioid agonist on: 1) intraocular pressure (IOP) in rabbits; 2) cAMP accumulation in rabbit iris ciliary bodies (ICBs); 3) 3H-norepinephrine (NE) overflow from electrically stimulated sympathetic nerves in ICBs. DPDPE Lowerd IOP in normal rabbits but not in sympathectomized (SX) eyes. Naloxone did not inhibit the effect of DPDPE on IOP in normal rabbits. DPDPE inhibited 3H-NE overflow and suppressed cAMP accumulation in ICBs. The presence of naltrindole, a delta receptor antagonist, did not prevent the ...


Effect Of Lead On Flexor Muscle Contraction And Photochemically-Induced Platelet Aggregation In Pial Microcirculation Of The Mouse, Amna Hamad Al Dhaheri Dec 1994

Effect Of Lead On Flexor Muscle Contraction And Photochemically-Induced Platelet Aggregation In Pial Microcirculation Of The Mouse, Amna Hamad Al Dhaheri

Theses

Lead is one of many heavy metal ions that can effectively compete for the binding sites of calcium, block the calcium channels and disturb the ion exchange. As a result, lead would be expected to affect the calcium-mediated cell functions. Muscle contraction and platelet aggregation are two important functions in which Ca2+ plays a major role and ultimately are affected by lead. Experiments were carried out to investigate the effect of lead on mouse flexor muscle contraction and on photochemically-induced platelet aggregation in pial microcirculation. A study of an acute exposure (1, 5, 10 and 25 µM) and a ...


Role Of The Cd40-Cd40 Ligand Interaction In Cd4(+) T Cell Activation Of Monocyte Interleukin-1 Synthesis, David H. Wagner Dec 1994

Role Of The Cd40-Cd40 Ligand Interaction In Cd4(+) T Cell Activation Of Monocyte Interleukin-1 Synthesis, David H. Wagner

Electronic Theses and Dissertations

Most studies of the induction of cytokine synthesis in monocytes have used an exogenous triggering agent such as Lipolpoysaccharide (LPS). However, during nonseptic chronic inflammatory responses (e.g., rheumatoid arthritis) monocyte activation occurs as a result of T cell generated signals. This report demonstrated that plasma membranes from anti-CD3 activated peripheral CD4$\sp{+}$ T cells (Tm$\sp{\rm A}$) but not from resting CD4$\sp{+}$ cells (Tm$\sp{\rm R}$) induced monocytes to synthesize IL-1 in the absence of costimulatory cytokines. The expression kinetics of the molecule(s) unique to activated T cells which interact with monocyte receptors to induce ...


Factors Influencing The Oxidation Of Lipoproteins And Plasma Lipids, Yanshan Ma Dec 1994

Factors Influencing The Oxidation Of Lipoproteins And Plasma Lipids, Yanshan Ma

Electronic Theses and Dissertations

The hypothesis that antioxidant vitamins (ascorbate and tocopherols) along with urate protect blood plasma lipids from oxidation was tested. Dietary fat is also an important factor influencing plasma lipid peroxidation. The purpose of this study was to investigate the role of plasma antioxidants and dietary fat on low density lipoprotein (LDL) and plasma lipid oxidation. In the first part of this study, we compared the ability of urate and ascorbate to protect human LDL from in vitro oxidation. LDL oxidation was initiated by 15 mM of a water soluble azo-initiator in the presence or absence of ascorbate or urate. The ...


Microcirculation: Electrophysiological Basis For The Response Of Endothelial Cells To Inflammatory Mediators-Bradykinin, Kai Miao Dec 1994

Microcirculation: Electrophysiological Basis For The Response Of Endothelial Cells To Inflammatory Mediators-Bradykinin, Kai Miao

Electronic Theses and Dissertations

Using conventional microelectrodes, I studied the electrical basis for determining the resting V$\sb{\rm m}$ in intact EC's from hamsters. The resting V$\sb{\rm m}$ were found to be $-$40 mV for aortic EC's and $-$43 mV for vena caval EC's. The contributions of ions to the resting V$\sb{\rm m}$ of aortic EC's were compared in terms of the transference number (t$\sb{\rm ion}$). To develop a technique for in situ monitoring changes in V$\sb{\rm m}$ of postcapillary venular EC's in the hamster mesentery, a voltage-sensitive fluorescent probe ...


Rheology Of Coating Colors Containing Water-Soluble Polymers And Their Effect On The Runnability Of The Clc Blade Coater, Harish K. Narasimhamurthy Dec 1994

Rheology Of Coating Colors Containing Water-Soluble Polymers And Their Effect On The Runnability Of The Clc Blade Coater, Harish K. Narasimhamurthy

Master's Theses

Four different classes of commercial rheology modifiers (thickeners) e.g., Polyacrylate (PA), Associative Cellulosic Thickener (ACT), Associative Synthetic Thickener (AST) and CMC were used in a simplified coating formulation to study their effects on rheological and viscoelastic properties of the coating colors. An attempt was also made to study their effect on runnability using the Cylindrical Laboratory Coater (CLC). A series of coatings were prepared using number one clay and styrene-butadiene latex. The thickeners were added to these at several levels. The coatings were evaluated for rheological and viscoelastic properties. The coatings were also applied onto paper using the CLC ...


Physical And Optical Properties Of Steam Exploded Laser Printed Paper, Arvind Kumar Sharma Dec 1994

Physical And Optical Properties Of Steam Exploded Laser Printed Paper, Arvind Kumar Sharma

Master's Theses

The main objective of this study was to investigate the effects of steam explosion on the optical properties of recycled fibers, i.e., brightness, opacity, scattering and absorption coefficients, and to find out whether explosive discharge caused fiber damage and affected fiber bonding ability.

Laser printed paper was pulped by the steam explosion process. Addition of two different chemicals, residence time, pressure, and dispersant level were varied during the steam explosion experiments. All factors were kept at two levels.

Full factorial design and regression analysis were applied to determine the effect of different factors on steam explosion pulp. The data ...


Estrogen Induced Eosinophil Migration Into The August Rat Uterus Is Associated With Intercellular Adhesion Molecule Expression, Daniel R. Orcutt Dec 1994

Estrogen Induced Eosinophil Migration Into The August Rat Uterus Is Associated With Intercellular Adhesion Molecule Expression, Daniel R. Orcutt

Master's Theses

Estrogen causes an influx of eosinophils into the uterus in female rats. The diapedesis of eosinophils out of the vasculature has also been observed in allergic reactions, parasitic infections, and atopic dermatitis, and has been associated with cellular adhesion molecules (CAMs). Antibody blocking studies against ICAM-1/ LFA-1 and VCAM-1/VLA-4 have suggested that both ligand/receptor sets of CAMs are involved in the selective recruitment of eosinophils out of the vasculature. ICAM- 1 is expressed on the vascular endothelium and decreases in expression when IL-4 is introduced. VLA-4 is present on eosinophils and is suspected to allow selective migration of ...


Investigations On Glycolipid Production By Pseudomonas Putida Grown On Toluene In Batch And Continuous Culture Conditions, Keith Foorest Dockery Nov 1994

Investigations On Glycolipid Production By Pseudomonas Putida Grown On Toluene In Batch And Continuous Culture Conditions, Keith Foorest Dockery

Dissertations and Theses

Utilization of toluene by Pseudomonas putida as its sole carbon and energy source affects morphology, outer membrane protein composition, and glycolipid production. Two strains of P. putida were found to utilize toluene and to coexist in continuous and batch culture. The two strains were designated translucent and opaque, based upon their readily identifiable coloration when grown on Luria agar. The translucent strain was the dominant strain in continuous culture conditions. The outer membrane proteins of P. putida were separated by sodium dodecyl sulphate polyacrylamide gel electrophoresis. When toluene is the carbon and energy source, the trend in protein composition was ...


Changes In Proteins Associated With Nitrogen Fixation And Iron Nutrition In The Marine Cyanobacterium Trichodesmium, Karen Marie Elardo Nov 1994

Changes In Proteins Associated With Nitrogen Fixation And Iron Nutrition In The Marine Cyanobacterium Trichodesmium, Karen Marie Elardo

Dissertations and Theses

This investigation tested the hypothesis that iron, as a micronutrient, will affect proteins in Trichodesmium and therefore affect nitrogen fixation. Changes in proteins that are a result of iron enrichment were compared to naturally occuring diel changes. Alterations in the iron protein of nitrogenase were compared to nitrogen fixation rates using the acetylene reduction technique. The observed changes in proteins were compared in Trichodesmium colonies from the Caribbean Sea and the Sargasso Sea. Trichodesmium colonies were monitored for protein and iron content over a diel period on two cruises. The changes in protein and iron content in Trichodesmium colonies were ...


A Comparison Of Neutrophil Migration In The Mouse In Response To Infection With Three Species Of Trichinella, Jon Darin Prulhiere Nov 1994

A Comparison Of Neutrophil Migration In The Mouse In Response To Infection With Three Species Of Trichinella, Jon Darin Prulhiere

Dissertations and Theses

The Genus Trichinella is currently thought to consist of 8 seperate species. Several methods have been used to help differentiate these. In this study the ability of three of these species, T. spiralis, T. pseudospiralis, and T. sp. 3 to idependantly infect MRL++ mice was compared at 5, 7, 11, 18 and 20 days post infection ( dpi) with the hope of discovering new distinguishing characteristics. Of interest was the development of inflammation through the accumulation of neutrophils associated with larvae of Trichinella in mouse skeletal muscle. This was evaluated with routine histological stains, endogenous peroxidase staining and immunohistochemical staining specific ...


An Analysis Of Factors Potentially Limiting The Abundance Of The Zebra Mussel (Dreissena Polymorpha) In Salmon Creek, Monroe County, New York, Steven J. Miller Oct 1994

An Analysis Of Factors Potentially Limiting The Abundance Of The Zebra Mussel (Dreissena Polymorpha) In Salmon Creek, Monroe County, New York, Steven J. Miller

Biology Master’s Theses

First reported in the Great Lakes basin in 1988, the zebra mussel (Dreissena polymorpha) has spread throughout the Great Lakes and central U.S. With a direct connection to Lake Erie, the New York State Erie Barge Canal was colonized by zebra mussels as early as the spring of 1989. Salmon Creek flows northeast from southern Monroe County to Braddock Bay, and Erie Barge Canal water is used to supplement creek flows north of the canal. At the beginning of the canal outfall channel to the creek is a dense bed of zebra mussels which has existed since at least ...


In Situ Regulation Of Cytosolic Phospolipase A₂, Beverly A. Rzigalinski Oct 1994

In Situ Regulation Of Cytosolic Phospolipase A₂, Beverly A. Rzigalinski

Theses and Dissertations in Biomedical Sciences

The 85 kDa cytosolic phospholipase A2 (cPLA2) is an agonist-responsive effector for intracellular signal transduction through the arachidonate cascade. In vitro studies have demonstrated that this enzyme is regulated by sub-micromolar calcium and is specific for arachidonate as the sn-2 fatty acyl group of phospholipid substrates. However, very little data is available regarding in situ mechanisms which govern the activity of cPLA2. The primarily objective of these studies was to develop an in situ system for the study of cPLA2, and investigate mobilization of arachidonate during signal transduction events.

Dimethylsulfoxide differentiation of the human lymphoma cell ...


Microhabitat Use By Macroinvertebrates In Barataria Bay, Louisiana, William H.F. Hayden Aug 1994

Microhabitat Use By Macroinvertebrates In Barataria Bay, Louisiana, William H.F. Hayden

LSU Historical Dissertations and Theses

A drop sampler was used to collect macroinvertebrates along transects in open and closed marshes within the Barataria Basin. Three-hundred-seventy-seven samples, covering 448 m2, were collected between August 1988 and September 1989. Sampling focused along the marsh edge where open water and flooded Spartina meet, covering a broad range of environmental conditions including different stem densities, distances to the marsh edge, and water depths. Other variables measured included water temperature, velocity, dissolved oxygen, salinity, turbidity, substrate, and marsh vegetation. Of the ten most frequently-occurring macroinvertebrates, three were transients (Callinectes sapidus, C. similis, and Penaeus aztecus), and seven were residents (Mysidopsis ...


Effects Of Alewife (Alosa Pseudoharengus) Predation On Zooplankton Community Structure In Honeoye And Conesus Lakes, Gregory J. Crego Aug 1994

Effects Of Alewife (Alosa Pseudoharengus) Predation On Zooplankton Community Structure In Honeoye And Conesus Lakes, Gregory J. Crego

Biology Master’s Theses

The objective of this study was to describe and compare the chemistry and alewife and piscivore abundance between Honeoye and Conesus Lakes to identify possible reasons of the continuing presence of large-bodied zooplankton in Honeoye Lake in the presence of alewife. Alewives were accidentally introduced into Conesus Lake in the late 1970's. By 1985, large Daphnia had disappeared and Crustacea size in Conesus Lake had decreased from 1.03 mm in 1972 to 0.5 mm in 1985 and has continued to decrease to 0.29 mm in 1988 and 1993. Alewives were confirmed in Honeoye Lake by 1991 ...


The Toxicity Of Cadmium To The Aquatic Amphibian, Xenopus Laevis, Sharon S. Millirons Aug 1994

The Toxicity Of Cadmium To The Aquatic Amphibian, Xenopus Laevis, Sharon S. Millirons

Master's Theses

Cadmium toxicity is poorly understood but is a potentially serious environmental pollutant. This study was initiated to determine the effect of significant concentrations of cadmium on a readily available aquatic laboratory organism.

The lethal concentration (LC50) for 50 percent of I week old Xenopus laevis tadpoles was determined to be 0.1 ppm CdCI 2. For 5 week old animals, the average LC50 was determined to be 0.98 ppm. Thus, cadmium poses greater toxic threats to the early developmental stages. Moreover, these concentrations of cadmium exceed those commonly found in the nation's water supply. Histological examination suggested that ...


Chlorophyll Fluorescence As A Measure Of Ozone Induced Stress, Jerry L. Faulkner Aug 1994

Chlorophyll Fluorescence As A Measure Of Ozone Induced Stress, Jerry L. Faulkner

Doctoral Dissertations

Chlorophyll fluorescence is a nondestructive, intrinsic probe of photosynthesis. It has been used in a variety of physiological and environmental research. This study attempted to investigate the usefulness of chlorophyll fluorescence as a monitor of ozone induced stress in Quercus rubra L.

Chlorophyll fluorescence measurements were taken from mature trees and seedlings in open top chambers located at the Tennessee Valley Authority Air Pollution Research Facility at Norris, Tennessee. Chambers reflected one of three ozone concentration treatments: sub-ambient, ambient, or twice ambient. Spring leaf expansion was also measured as was spring and autumn chlorophyll content of leaves from mature trees ...


Interaction With Choline And Pantothenic Acid With Carnitine In Humans And Rodents, James William Daily Iii Aug 1994

Interaction With Choline And Pantothenic Acid With Carnitine In Humans And Rodents, James William Daily Iii

Masters Theses

It had been shown previous to this research that supplementation with choline and pantothenic acid results in reduced plasma concentrations and urinary excretion of carnitine in adult humans. This research demonstrated similar effects in younger human subjects and developed an animal model for future study of the interaction of choline and pantothenic acid with carnitine.

Rats were first used as an animal model but neither choline, pantothenic acid, nor both combined had any effect on urinary or plasma carnitine concentration. It was concluded that rats were not an acceptable model, possibly because of the high choline oxidase activity present in ...


Expression Of Integrated And Methylated Hiv-Ltr In Human T-Cells And Monkey Kidney Cells By Frog Virus 3 Infection, Celene M. Spangler Aug 1994

Expression Of Integrated And Methylated Hiv-Ltr In Human T-Cells And Monkey Kidney Cells By Frog Virus 3 Infection, Celene M. Spangler

Master's Theses

DNA methylation has been implicated in the suppression of transcription of a large spectrum of eukaryotic genes. Frog virus 3 (FV3) contains genomic DNA that is the most extensively methylated of all known animal viruses. However, FV3 gene expression is tightly regulated in a sequential fashion in infected cells. Therefore, FV3 must have evolved mechanism(s) to overcome the inhibitory effects of DNA methylation. FV3 has been shown to induce expression of methylated foreign genes in transient transfections. This study was designed to establish if this FV3 induced expression of methylated genes could be demonstrated in stable cell lines which ...


The Hydroclimatic Characteristics Of Nacogdoches, Texas With Implications For Water Resources Management, Larry David Clendenen Aug 1994

The Hydroclimatic Characteristics Of Nacogdoches, Texas With Implications For Water Resources Management, Larry David Clendenen

Electronic Theses and Dissertations

Sayok's (1986) study and statistical analysis of the climate at Nacogdoches, Texas covering 1901 to 1980 is updated to include the most recent twelve years (1981-92) of records. Missing data are estimated, all analyses are repeated, and the new 1961-90 normal climate is compared to the 1951-80 and other normals. Results showed that the climate at Nacogdoches during the last decade was about the same as that in other recent decades. Thomthwaite's (1957) climate classification defines Nacogdoches as moist subhumid, third mesothermal, with moderate summer water deficiency, and a temperature effIciency regime equal to a fourth mesothermal climate ...


The Effect Of Insulin Mimetics On Enzymes Of Fatty Acid Biosynthesis, Eric A. Berg Aug 1994

The Effect Of Insulin Mimetics On Enzymes Of Fatty Acid Biosynthesis, Eric A. Berg

Master's Theses

Fatty acid biosynthesis, an insulin regulated pathway, is the process of producing fatty acid chains from 2 and 3 carbon units. Two enzymes in this pathway that insulin affects are glucose-6-phosphate dehydrogenase (G6PDH) and fatty acid synthase (FAS). Sodium vanadate and sodium selenate have demonstrated insulin-like effects in several tissue and cell types. These mimetic effects include increasing glucose transport, regulating glycolytic enzymes, normalizing plasma glucose levels and activities of insulin regulated enzymes in diabetic rats. Our goal was to examine effects of sodium vanadate and sodium selenate on fatty acid biosynthesis in two insulin responsive systems: Isolated rat hepatocytes ...


Signal Transduction Mechanisms For The Stimulation Of Lipolysis By Growth Hormone: A Dissertation, Rupert G. Yip Aug 1994

Signal Transduction Mechanisms For The Stimulation Of Lipolysis By Growth Hormone: A Dissertation, Rupert G. Yip

GSBS Dissertations and Theses

The purpose of this study was to investigate the mechanism of action of lipolysis by growth hormone in rat adipocytes. GH-induced lipolysis, in contrast to that of isoproterenol (ISO), is slow in onset (lag time >1h), small in magnitude (~2X basal). and requires corticosteroid. Evidence for direct coupling between GH receptors and adenylyl cyclase or G-proteins is lacking, and although we could detect no measurable change in cAMP content after treatment with GH + dexamethasone (Dex), it is likely that cAMP activation of protein kinase A is a central event in GH-induced lipolysis. Rp-cAMPS, a competitive antagonist of cAMP was equally ...


The Dna Sequence Required For The Maximal Transactivation Of The Vp5 Gene Of Herpes Simplex Virus Type 1, Shin Chen Jul 1994

The Dna Sequence Required For The Maximal Transactivation Of The Vp5 Gene Of Herpes Simplex Virus Type 1, Shin Chen

Dissertations and Theses

A regulatory element involved in the transcriptional activation of the major capsid protein (VP5) of herpes simplex virus type 1 was identified and characterized in this research project. Gel mobility shift assay with nuclear extracts from both uninfected and HSV-1 infected HeLa cells identified two major protein-DNA complexes involving the VP5 promoter. No viral specific complex found. DNase I and orthophenanthroline-cu+ footprint analyses in the same laboratory revealed that the two complexes involve a single binding site, GGCCATCTTGAA, located between -64 and -75 bp relative to the VP5 cap site. To determine the function of this leaky-late binding site (LBS ...


Characterization Of The Mas Protein As An Angiotensin Ii Receptor, James E. Raynor Jr. Jul 1994

Characterization Of The Mas Protein As An Angiotensin Ii Receptor, James E. Raynor Jr.

ETD Collection for AUC Robert W. Woodruff Library

The mas proto-oncogene encodes a seven transmembrane protein (MAS) which is suggested to function as a receptor for angiotensin. It (MAS) was initially identified in NIH-3T3 cells that were transformed with DNA isolated from a human epidermoid carcinoma. These cells formed foci in culture and tumors when injected into nude mice. On the other hand, untransformed cells did not. Further analysis of these cells showed that transformed cells bind increased levels of angiotensin when compared to untransformed cells. These studies also demonstrated that the Mas protein was structurally similar to the angiotensin receptor transmembrane proteins, AT1 and AT2 . This investigation ...


Structure-Substrate Binding Relationships Of Hiv-1 Reverse Transcriptase, Steve Chien-Wen Huang Jul 1994

Structure-Substrate Binding Relationships Of Hiv-1 Reverse Transcriptase, Steve Chien-Wen Huang

Theses and Dissertations in Biomedical Sciences

Human Immunodeficiency Virus, type 1 (HIV-1), is the causative agent of the Acquired Immunodeficiency Syndrome (AIDS). HIV-1 reverse transcriptase (RT), a heterodimer p66/p51, has been the major target for treatment of AIDS. The significance of the p51 subunit and the RNase H domain of p66 in terms of their influence on the RNA-dependent DNA synthesis was investigated. Clones of the wildtype HIV-1 RT subunits, p66 and p51, and a recombinant C-terminal deletion mutant, p64, [Barr, P. J. (1987) Bio/Technoloav 5, 486-489] were employed to study the structure-substrate binding relationships of HIV-1 RT. The activity assays of RNA-dependent DNA ...


Benthic Community Responses To Hypoxic Conditions In The Lower Rappahannock River, Virginia, Mary Elaine Smith Jul 1994

Benthic Community Responses To Hypoxic Conditions In The Lower Rappahannock River, Virginia, Mary Elaine Smith

Biological Sciences Theses & Dissertations

The effects of seasonal low dissolved oxygen conditions upon benthic macroinvertebrate communities were studied in the lower Rappahannock River, a tributary of the Chesapeake Bay. Benthic communities were sampled during March, June, August, and September 1993 at five equidistant depths (5, 10, 15, 20, and 25 m) extending upwards from the deepwater Virginia Benthic Biological Monitoring Station LE3.4 located in the deep basin just inside the mouth of the Rappahannock River. Infaunal species diversity, richness, biomass, and density were measured along with the vertical depth distribution of organisms within the sediment. Significant sediment differences were found between the shallowest ...


Determination Of Pancreatic And Salivary Amylase By Enzyme Immunoassay And Their Prevalence In Hyperamylasemic Patients, Sabdra Borgens Ward Jul 1994

Determination Of Pancreatic And Salivary Amylase By Enzyme Immunoassay And Their Prevalence In Hyperamylasemic Patients, Sabdra Borgens Ward

Theses and Dissertations in Biomedical Sciences

Currently, amylase determinations are nonspecific for the organ source and are based entirely on the enzymatic properties of amylase to produce a measurable product or byproduct. The determination of pancreatic amylase is important in the diagnosis of acute pancreatitis. Most commercially available tests for amylase employ the measurement of the change in NADH absorbance at 280 nm or of the p-nitrophenol released from a maltotetrose substrate. These are nonspecific measurements of pancreatic amylase and often necessitate other tests to be run such as a serum lipase.

The two predominant isoenzymes of amylase are pancreatic (p-amylase) and salivary (s-amylase); the most ...


Chlorophyll Characterization Of Three Mistletoes And The Chloroplast Ultrastructure Within Aerial And Endophytic Tissues Of Phoradendron Juniperinum, Wesley Emanuel Dubbs Jun 1994

Chlorophyll Characterization Of Three Mistletoes And The Chloroplast Ultrastructure Within Aerial And Endophytic Tissues Of Phoradendron Juniperinum, Wesley Emanuel Dubbs

Dissertations and Theses

The aerial shoot pigments of three epiphytic mistletoes and their hosts were examined and the results were found to concur with earlier reports. Emphasis was placed on the mistletoe Phoradendron juniperinum. Absorbance spectroscopy indicated a very similar ratio of pigments in both the aerial tissue of the mistletoe and its juniper host. Spectroscopic examination found the presence of chlorophyll in the endophytic tissue of the genus Phoradendron for the first time. Total chlorophyll concentrations of the endophytic tissue of Phoradendronjuniperinum were found to be approximately 10% that of aerial shoots. However, chlorophyll alb ratios of endophytic tissue were 40% of ...


Effects Of Alkaline Internal Sizing On Rotogravure Print Quality Using Waterbased Inks, Michael L. Busche Jun 1994

Effects Of Alkaline Internal Sizing On Rotogravure Print Quality Using Waterbased Inks, Michael L. Busche

Master's Theses

The effect of alkaline internal sizing in improving paper smoothness and ink gloss in waterbased rotogravure printing was investigated. Papers were internally sized with alkyl ketene dimer (AKD) under alkaline conditions from slack-sized to hard-sized. Papers were printed with waterbased inks on a web gravure press. A major problem with waterbased inks is increased surface roughening of paper and a low ink gloss. Temporal surface roughening was reduced by increased AKD internal sizing with a concomitant significant increase of up to 400% in ink gloss. Surface properties were correlated with print quality. The print quality improved with increased hydrophobicity of ...