Life Sciences Commons^™

The Effects Of Selenate, Molybdate And Chromate On The Triiodothyronine Induced Enzyme Activity And Mrna Level For Both Fatty Acid Synthase And Malic Enzyme, Yuan Zhu

Masters Theses

In chick embryo hepatocytes in culture, triiodothyronine (T3) stimulates enzyme activity, mRNA level and transcription rate for both fatty acid synthase (FAS) and malic enzyme (ME). Recent evidence has demonstrated the effects of selenate, molybdate and chromate on various physiological processes. Little information, however, is available on the effects of these metal ions on the T3- regulated gene expression for FAS and ME.

In chick embryo hepatocytes incubated in a chemically defined medium, addition of sodium selenate (20 μM) coincident with T3 almost completely inhibited the T3-induced stimulation of FAS and ME activity and accumulation of their respective mRNA's. Neither …

Use Of Hot-Soft Calendering To Increase Gloss And Smoothness Of Light Weight Coated Paper (Lwc), Andrew L. Tanner

Paper Engineering Senior Theses

The purpose of this exercise was to investigate the use of Hot-Soft calendering as a means of pre-treatment for lightweight coated grades. The hot-soft calendering was performed at three temperatures and pressures to give nine test groups. These groups along with one non-treated sample, were coated with the same coating and under the same conditions. Testing was performed on the uncoated base stock, the coated paper, and the coated paper after supercalendering.

The results showed that the hot-soft calendering, prior to coating, was beneficial to gloss only at higher temperatures and pressures. At lower temperatures and pressures, no significant change …

Cocaine And Timing: Drug Effects Under A Mixed Fixed-Interval Extinction Schedule, Vincent O. Hodge

Masters Theses

The effects of cocaine hydrochloride (3.2-56.2 mg/kg) were determined in rats performing under a mixed fixed-interval 60-seconds extinction 120-seconds schedule of food delivery. Responses were recorded in successive 5-second bins. With the exception of the highest dose (56.2 mg/kg), cocaine did not significantly affect rate of responding under the fixed-interval component or extinction component, or the time of peak responding under the extinction component. The highest dose significantly reduced response rates and shifted the time of peak responding leftward to quicker and earlier moments. Results are discussed in terms of possible rate- and time-dependent effects of stimulant drugs.

Effectiveness Of Aluminum Sulfate And Ethylenediamine Tetraacetic Acid As Carbohydrate Protectors During Oxygen Delignification, Joey L. Klinge

Paper Engineering Senior Theses

Objective

The purpose of this thesis will be to examine three carbohydrate protector's effectiveness during oxygen delignification. Today, about half of the lignin can be removed from a conventional kraft pulp through the application of oxygen delignification as an initial stage in the bleaching process. More extensive delignification results in the degradation of pulp carbohydrates, influencing the final pulp qualities.¹ Carbohydrates are attacked by the decomposition of hydroperoxides catalyzed by heavy metal ions, free radicals. Carbohydrate protectors function to deactivate the free radicals, reducing the rate of attack on the carbohydrates.² This thesis is based on the above …

Steam-Explosion Of Wastepaper As A Pulping Process, Edward G. Schmitt Iii

Paper Engineering Senior Theses

Recycling is a major concern in the nineties, and therefore wastepaper recycling is also in the spotlight. This concern has made it necessary to explore new ways to handle wastepaper. Steam-explosion is a possible pulping process that has the capabilities of handling grades that previously have not been used.

The effects of steam-explosion on 100% laser and Xerox printed paper were studied and the resulting optical properties determined. Chemical addition, residence time, pressure, and dispersant level were varied in the steam-explosion trials. A Morton Slush Maker was used to simulate conventional hydra-pulping for comparison with the steam-explosion pulp.

Steam-explosion removes …

Total Blood Cholesterol, Blood Triglyceride, And Blood Hdl Correlation, Rebecca Lynn Babler

Masters Theses

The purpose of this investigation was to determine the relationship between total blood cholesterol levels, blood triglyceride levels, and blood HDL levels in men and women 20 to 80 years of age. All subjects fasted for 12 hours prior to having their blood drawn.

The computer program SPSSX (SPSSX, Inc., 1988) was used along with subprograms CONDESCRIPTIVE, CORRELATION, and ANOVA. Pearson Product Moment Correlations were calculated for all subjects, for male subjects, and for female subjects.

The study revealed a low correlation coefficient between blood cholesterol levels and blood triglyceride levels for all subjects, female subjects and male subjects. There …

1-Nitronaphthalene Causes Ultrastructural Changes Primarily In Nonciliated Bronchiolar Epithelium Followed By Ciliated Epithelium In The Rat, John-Michael Sauer

Masters Theses

This study describes morphological changes in the lung at several time intervals following a single injection of 1-Nitronaphthalene (100 mg/kg intraperitoneal) in male Sprague-Dawley rats using transmission and scanning electron microscopy. Dilation of the smooth endoplasmic reticulum and mitochondrial distension in the nonciliated bronchiolar (Clara) cells was apparent as early as 1 hour after injection, while adjacent ciliated cell showed minimal changes. At 6 hours, when respiratory distress was apparent in the animals, Clara and ciliated cells exhibited chromatin clumping, loss of mitochondrial cristae and cytoplasmic vacuolization. Also at 6 hours, the interstitial area around the terminal bronchioles was infiltrated …

The Feasibility Of Foamed Ink Use In Flexographic Printing, Anthony Malerich

Honors Theses

Flexographic and rotogravure printing are two of the three predominant printing processes; the other is offset lithography. They are very similar in that they each transfer a very fluid, low viscosity ink from an ink fountain to an engraved cylinder. Foamed ink is a completely water based liquid ink that is foamed by the introduction of air at press side, and presents numerous advantages over conventional organic solvent based and water based inks. The prime advantage is that foamed inks are a completely aqueous, environmentally safe system. Another benefit is the cost savings associated with foamed ink. Ink consumption is …

The Effect Of Wet Pressing On Filler Stratification, Patrick T. Gish

Paper Engineering Senior Theses

Research was conducted to determine the effect of press loading upon filler stratification with the intention of observing the development of a stratified sheet.

Press conditions were held constant with the exception of pressure applied to the sheet. The sheet was then split and examined for filler content. The paper tested was highly refined, very moist, and of a heavy basis weight.

Results indicated a gradual trend of increased stratification with increased press loading. Filler moved toward the direction that water was leaving the sheet.

Effects Of Phenobarbital In Combination With Phenytoin Or Valproic Acid On The Delayed-Matching-To-Sample Performance Of Pigeons, Catherine Ann Karas

Masters Theses

The present study examined the effects of phenobarbital (S, 10,20, and 40 mg/kg), phenytoin (2.5, 5, 7.5, and 15 mg/kg), and valproic acid (40, 60, 80, and 120 mg/kg), and those of phenobarbital (10 and 20 mg/kg) in combination with phenytoin (2.5,5, and 7.5 mg/kg) or valproic acid (40, 60, and 80 mg/kg), on the delayed-matching-to-sample performance of pigeons. In general, high doses of each individual drug reduced accuracy. Drug combinations also reduced accuracy relative to control values. Reductions in accuracy produced by drug combinations were very similar in magnitude to those predicted by a response-addition model of drug interaction.

Supercalender Variables For Release Liner, Douglas A. Lamb

Paper Engineering Senior Theses

This senior engineering design project studies the effect of increased steel roll temperature and increased sheet moisture on the supercalendering of uncoated release backing paper. Sheets were supercalendered using a Beloit Wheeler laboratory supercalender fitted with a temperature controller. The moisture of the sheets was adjusted using 20 and 80% R.H. humidity chambers.

An increase in gloss, densometer and reduction in caliper were evident with the increase of both the steel roll temperature and sheet moisture. Increased sheet moisture seemed to have little effect on the Sheffield Smoothness values. However, the increase in steel roll temperature did product improved smoothness.

The Cross Flow Filtration Concept Used As A Deinking Method, Gregory E. Gourlay

Paper Engineering Senior Theses

The cross-flow filter was used to deink a 70% news and 30% coated section furnish. This has never been attempted before so the main objective was to determine if it would work. The secondary objective was to find the highest operating consistency possible. The filter can be used to remove ink, fines and filler from a stock suspension. The feed, accept and effluent samples were analyzed for percent ash, brightness, clark classification, Kajanni fiber length analysis and image analysis. The effluent had a 29.81% ash compared to the feed ash of 8.32%. The accept brightness was 42.9 while the feed …

Reducing The Amount Of Microbiological Growth Using Ultrasonic Treatment, Mark Gill

Paper Engineering Senior Theses

This thesis explored the possibility of using ultrasonic treatment to reduce the amount of microbiological growth in a sample of contaminated mill wastewater. It was found that ultrasonic treatment reduces microbiological growth through the mechanism of cavitation. percent inhibition increases with both time of treatment and applied power. The most economical conditions were high power and a short treatment time.

The increase in cell volume had an inverse effect on the percent inhibition. The increase in consistency of the treated solution also had an inverse effect on the percent inhibition and 6% was the maximum treatable consistency.

Ultrasonic treatment was …

The Effects Of Residual Surfactant On The Retention Of Fines, Steve L. Myers

Paper Engineering Senior Theses

Research was conducted to determine if small amounts of non-ionic surfactants present in the papermaking furnish would effect fine particle retention.

The Britt Jar was used for the first part of this experiment to determine if the surfactant would affect the retention. The surfactant was tested at six different concentrations and no detrimental effects were seen.

Subsequent Britt Jar experiments were used to determine the effects of shear, and the effects of retention aids. These experiments were conducted primarily to see if they were interacting some way with the surfactant. The results showed no interaction.

The final part of the …

The Effect Of Coating Lubricants On Boxboard Hot-Melt Glueability, James R. O'Brien Jr.

Paper Engineering Senior Theses

Coating lubricants are commonly used in the folding boxboard industry to reduce dusting, improve gloss, increase dried coating flexibility, and modify coating slurry viscosity. Hot-melt adhesives are becoming increasingly popular among boxboard converters due to the strong bonds developed with very little set time. Very little is known about the interaction between the lubricants on the coating surface and adhesion developed with hot-melt adhesives.

In this study 100% recycled boxboard was coated on an air knife coater with a base coating and with 1%, 2%, 4%, and 8% calcium stearate and polyethylene glycol lubricants. The board was tested for Gardner …

The Effects Of Ph And Time On Fiber Surface Area, Daniel R. Norey

Paper Engineering Senior Theses

In an effort to integrate some of the diverse approaches to pulp swelling evaluation, this study incorporated various test to reveal the possible swelling changes occurring in a fiber. The scope of this report is to study the effects of pH and time of soaking in water on secondary fiber swelling and surface area.

For each trial, fibers were soaked for different times ranging between 0 and 25 hours. The trials consisted of three different samples which has pH's of 7.2, 9.2 and 11.5. This study involved three tests to help analyze any changes in the fiber. They are the …

The Effect Of The Mixing Ratio Of Fly Ash And Paper Industry Sludge On Hydraulic Conductivity, Christine J. Lupu

Paper Engineering Senior Theses

Introduction

Groundwater contamination is a large concern for everyone. Because of this many precautions are being taken to protect the groundwater. In addition, the availability of landfill area is decreasing because of the difficulty in siting new landfills due to the latest legislation. Therefore, landfill and/or design alternatives must be created to reduce the increasing cost of landfilling.

Two of the major sources of waste produced by the pulp and paper industry are wastewater treatment sludge and fly ash from the combustion of wood waste and coal. The current disposal method of these two wastes are in landfills. Alternatives are …

Increasing The Hardwood Content On The Furnish By Separate Refining, David K. Finn

Paper Engineering Senior Theses

Introduction

It is an old papermaker's adage that paper is made in the beater. This means that the performance and the physical properties of the paper are determined by the type and the extent of the mechanical action to which the fibers are subjected before they are joined to form paper. The terms used to describe the function of refining; free beaten, wet beaten, et al are all traditionally vague, by reason of the complicated structure of the fibers and the even more complicated changes these fibers undergo during the refining process.