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Graduate Theses, Dissertations, and Problem Reports (ETD)

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Evaluating Real-World Idle Emissions From Heavy-Duty Diesel Vehicles, Abm Siddiqur Rahman Khan Jan 2005

Evaluating Real-World Idle Emissions From Heavy-Duty Diesel Vehicles, Abm Siddiqur Rahman Khan

Graduate Theses, Dissertations, and Problem Reports (ETD)

Long haul trucks in the USA idle for extended periods at truck stops and at pickup and drop-off points. The idling consumes fuel, contributes to engine wear and reduces atmospheric quality, but it cannot simply be proscribed because in many cases cab heat or air-conditioning provides essential driver comfort. As an example, there are nearly 1.5 million interstate trucks that operate in California, where climate control is essential. A comprehensive tailpipe emissions database to describe idling impacts is not available at present, although studies have been conducted to quantify idle emissions and to project the advantages of idle reduction technologies …

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Clinton And Bush Administrations' Nuclear Non-Proliferation *Policies On North Korea: Challenges And Implications Of Systemic And Domestic Constraints, Gunsik Kim Jan 2005

Clinton And Bush Administrations' Nuclear Non-Proliferation *Policies On North Korea: Challenges And Implications Of Systemic And Domestic Constraints, Gunsik Kim

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study compared and evaluated the conduct of US policies towards North Korea in order to address the North Korean nuclear threat under the Clinton (1993--2000) and the Bush (2001--2004) administrations. The capabilities of the two administrations to carry out their preferred policies toward the global threat were evaluated in view of the systemic and domestic constraints that they faced. Domestic constraints identified were the US Congress, American political culture and public opinion and bureaucratic problems. Systemic constraints were the lack of coordination and differences in policy frameworks of South Korea, Japan, China and Russia, and the difficulty of dealing …

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Evaluation Of Surface Mechanical Properties Of Pot Hardware Materials In Continuous Galvanizing Lines, Anand Krishnaswamy Jan 2005

Evaluation Of Surface Mechanical Properties Of Pot Hardware Materials In Continuous Galvanizing Lines, Anand Krishnaswamy

Graduate Theses, Dissertations, and Problem Reports (ETD)

Pot hardware in continuous galvanizing lines is subjected to harsh and corrosive environment. The application of pot hardware in such conditions can cause surface degradation of the pot hardware materials thereby decreasing their life. The surface degradation can be due to wear, decrease in hardness or change in surface elastic modulus. The 500-lb lab scale test set-up at WVU was used to simulate the conditions existing in the actual continuous galvanizing line.;Ultrasonic equipment has gained immense importance in the field of non-destructive testing. One such instrument that measures surface hardness based on the shift of an ultrasonic frequency was used …

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Analysis Of Aging Effects And Effectiveness Of Dewatering Treatment Methods On Acid Mine Drainage Sludge, Phanindra Kumar V. Kunderu Jan 2005

Analysis Of Aging Effects And Effectiveness Of Dewatering Treatment Methods On Acid Mine Drainage Sludge, Phanindra Kumar V. Kunderu

Graduate Theses, Dissertations, and Problem Reports (ETD)

Acid Mine Drainage (AMD) is produced when sulfide minerals in overburden are subjected to oxygen and water, and generally contains low pH, high acidity and high dissolved metal concentrations. Typically, active treatment of AMD involves the addition of a neutralizing reagent to raise the pH and precipitate the metals as their respective insoluble metal hydroxides. As a by-product of the active treatment of AMD, a large amount of sludge is generated. A site, established in Monongalia County, WV for the active treatment of AMD using ammonia and hydrogen peroxide, generated sludge consisting mainly of water with a total solids concentration …

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Using Gis And Landowner Survey To Determine If The Forest Stewardship Program Is Effective At Generating Involvement In Forest Health Issues In West Virginia, David Page Mccann Jan 2005

Using Gis And Landowner Survey To Determine If The Forest Stewardship Program Is Effective At Generating Involvement In Forest Health Issues In West Virginia, David Page Mccann

Graduate Theses, Dissertations, and Problem Reports (ETD)

A risk rating map created from 22 shapefiles of pest and disease activity data was used to produce maps of individual properties distributed to half of survey subjects along with a postcard questionnaire. In total, 933 landowners were surveyed; 21% responded. The affects of three factors---the Forest Stewardship Program (FSP), region, and a map---on landowner interest were investigated using ANOVA and logistic regression. The affects of covariables risk rating and acreage were evaluated using ANCOVA. Logistic regression identified preferred delivery methods and pests and diseases relevant to landowners. FSP participation significantly affected interest level, the selection of gypsy moth, and …

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Effects Of Transitive Stimulus Generalization On Within -Sets Generalization And Between -Sets Generalization, Dana S. Siira Jan 2005

Effects Of Transitive Stimulus Generalization On Within -Sets Generalization And Between -Sets Generalization, Dana S. Siira

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of the study was to examine whether or not within-sets generalization (WSG) and between-sets generalization (BSG) are dependent on transitive stimulus generalization (TSG). A match-to-sample training procedure was used to train four typically developing five-year-old children to select stimuli from set A (fractions in ratio form) in the presence of stimuli from either set B or set C (fractions in picture form). The emergence of TSG, WSG, and BSG then was examined through presentations of stimuli involved in training and stimuli not involved in training.;Participants then were trained on the certain combinations of stimuli that were used to …

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The Role Of Apoptosis In Muscle Remodeling, Parco Ming-Fai Siu Jan 2005

The Role Of Apoptosis In Muscle Remodeling, Parco Ming-Fai Siu

Graduate Theses, Dissertations, and Problem Reports (ETD)

Apoptosis has been implicated in mediating the process of muscle loss during muscle disuse and with aging. However, the physiologic role of apoptosis in muscle remodeling is largely unknown. The purposes of this dissertation were to examine the role of apoptosis in different muscle remodeling conditions including muscle denervation, hindlimb suspension, muscle unloading following overload, endurance treadmill training, and muscle overload in mice, rats, or quails. Apoptotic signaling components and cellular stress markers including Bax, Bcl-2, Apaf-1, cytochrome c, caspases, Smac/DIABLO, XIAP, ARC, FLIP, AIF, p53, Id2, p21, c-Myc, PARP, HSP70, HSP27, HSP60, MnSOD, CuZnSOD, catalase, H2O2, MDA/4-HAE, nitrotyrosine or …

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Identification Of Athd2c As A Novel Regulator Of Aba Signaling In Arabidopsis Thaliana, Sunandini Sridhar Jan 2005

Identification Of Athd2c As A Novel Regulator Of Aba Signaling In Arabidopsis Thaliana, Sunandini Sridhar

Graduate Theses, Dissertations, and Problem Reports (ETD)

This report describes AtHD2C as a regulator of the ABA controlled events. AtHD2C is a member of the HD2-type histone deacetylase family. Results indicated an overall physiological significance for the HD2 proteins as well as a possible involvement in embryo development. In continuum with this, seeds overexpressing AtHD2C were insensitive to ABA, NaCl and mannitol at germination. This phenotype was supported by ABA-responsive gene expression patterns in the transgenic plants that implicated a negative role for AtHD2C in ABA response regulation in this developmental window. Additionally, the AtHD2C transcript accumulation was down-regulated by ABA that was reflected by the down-regulation …

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Circuit Analysis Tools For Evaluating Separation Efficiency Of Dense Medium Separators, Hongyan Sun Jan 2005

Circuit Analysis Tools For Evaluating Separation Efficiency Of Dense Medium Separators, Hongyan Sun

Graduate Theses, Dissertations, and Problem Reports (ETD)

In order to evaluate the relative separation efficiency among various circuits, a modified circuit analysis tools has been developed and applied to some circuits based upon dense medium separation. The results indicated that this circuit analysis method could predict separation efficiency of different circuit configuration without using washability data.;Based on the selective function for one stage separation, the selective functions for multi-stage circuit configurations were derived, and used to simulate the various circuit configurations. The simulation results demonstrated that some circuit configurations can improve the separation efficiency.;In-plant data for two-stage dense medium cylindrical and conical cyclone circuits without recirculation were …

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An Attack-Resistant Approach To Vulnerability Scanner Design., David Phillip Shaver Jan 2005

An Attack-Resistant Approach To Vulnerability Scanner Design., David Phillip Shaver

Graduate Theses, Dissertations, and Problem Reports (ETD)

Vulnerability scanners are used to scan and detect known vulnerabilities in computer systems. An attacker can exploit these vulnerabilities to compromise the security of a system and potentially cause harm. Thus, it is vital to detect and repair any vulnerabilities that exist. Vulnerability scanners, however, are themselves susceptible to attack. If an attacker were to compromise a scanner, they could force it ignore the vulnerabilities of other systems. They could then compromise these other computers by exploiting the undetected vulnerabilities. Due to the importance of preventing such false positives in scan results, this research proposes a new approach to vulnerability …

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Political Economy Of Railway Extensions In Kenya: The Case Of The Uasin Gishu Railway 1901-1930, John Mwaniki Mwaruvie Jan 2005

Political Economy Of Railway Extensions In Kenya: The Case Of The Uasin Gishu Railway 1901-1930, John Mwaniki Mwaruvie

Graduate Theses, Dissertations, and Problem Reports (ETD)

The history of the construction of the Uasin Gishu railway demonstrates the complexity of formulating and implementing a colonial development project. It involved an array of actors with divergent interests. As result, the project became the most controversial railway extension in Kenya, which some critics have called a "colonial scandal." The main areas of controversy involved the altering of the original route for the Kisumu to Mumias railway, which was meant to serve the most productive African district in favor of a line starting from Nakuru via Uasin Gishu to Mumias to cater for the interests of European settlers who …

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Multi-Heuristic Theory Assessment With Iterative Selection, Kareem Ammar Dec 2004

Multi-Heuristic Theory Assessment With Iterative Selection, Kareem Ammar

Graduate Theses, Dissertations, and Problem Reports (ETD)

Modern day machine learning is not without its shortcomings. To start with, the heuristic accuracy, which is the standard assessment criteria for machine learning, is not always the best heuristic to gauge the performance of machine learners. Also machine learners many times produce theories that are unintelligible by people and must be assessed as automated classifiers through machines. Theses theories are either too large or not properly formatted for human interpretation. Furthermore, our studies have identified that most of the data sets we have encountered are satiated with worthless data that actually leads to the degradation of the accuracy of …

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Development Of A Program To Gather And Process Data From Oil And Gas Fields, Joshua R. Cook Dec 2004

Development Of A Program To Gather And Process Data From Oil And Gas Fields, Joshua R. Cook

Graduate Theses, Dissertations, and Problem Reports (ETD)

In this thesis new software is developed to examine the needs and available options to gather information from oil and gas fields and to analyze data in an efficient manner. The program outlines potential setups as well as practical analysis techniques. The result is a program to store field data and capability to analyze input in different formats.;The developed system uses accounting, economics, engineering, and management concepts to process data. The program uses the relationships between field data gathered in a number of methods. The developed program provides a useful tool for the engineer to gather oil and gas field …

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Effect Of Driving Cycles On The Particulate Mass And Number Emissions From In-Use Heavy Heavy-Duty Diesel Vehicles, Sairam Thiagarajan Dec 2004

Effect Of Driving Cycles On The Particulate Mass And Number Emissions From In-Use Heavy Heavy-Duty Diesel Vehicles, Sairam Thiagarajan

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study focused primarily on the particle mass and number emission from various in-use heavy heavy-duty diesel vehicles operating on different driving cycles. Chemical speciation results are also presented to discuss the formation and composition of particles emitted during various cycles. Tests were performed with West Virginia University's Transportable Heavy Duty Vehicle Emissions Testing Laboratory located at Riverside, California. Five vehicles were selected to cover a wide range of model year from 1989 to 2004. All five vehicles were subjected to chemical speciation and analysis conducted by Desert Research Institute. WVU employed the use of the Scanning Mobility Particle Sizer …

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Manufacturing And Evaluation Of Structural Products With Recycled Polymers, Raghuram Phani Aditham Dec 2004

Manufacturing And Evaluation Of Structural Products With Recycled Polymers, Raghuram Phani Aditham

Graduate Theses, Dissertations, and Problem Reports (ETD)

The rapid growth of Wastes from Electrical and Electronic Equipment (WEEE) can be attributed to the rapid developments in technology, leading to reduction in service life to less than 2 years in certain products. Thermoplastics such as Acrylonitrile-Butadiene-Styrene (ABS) and Polycarbonate (PC) form a significant percent of the Electronic Shredder Residue (ESR) that were used in this research to manufacture and evaluate structural products with recycled polymers.;In this research, offset blocks for highway and bridge guardrail systems were developed using recycled polymers reinforced with glass fabric as shell and discarded tire strips/wood as core materials. Optimum compression molding process parameters …

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Behavior Of Frp Wrapped Concrete Cylinders, Renee R. Rajappa Dec 2004

Behavior Of Frp Wrapped Concrete Cylinders, Renee R. Rajappa

Graduate Theses, Dissertations, and Problem Reports (ETD)

In this research, increases in strength, stiffness and ductility due to external wrapping of Carbon Fiber Reinforced Polymer (CFRP) sheets on plain and steel reinforced concrete cylinders were studied. The research focused on behavior of plain and wrapped concrete cylinders with respect to parameters such as: (1) concrete compressive strength (fc'); (2) fiber orientation of CFRP wrap (0°, 45° and +/-45°); (3) cylinder size (3" x 6", 4" x 8", 6" x 12"); (4) number of CFRP wraps (1, 3, 6); (5) wrapping height and location (top and bottom, middle); (6) degree of fabric wetting; and (7) degree of bonding …

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Characterization Of Cyp2d Protein From Human Brain Cerebellum, Deepak Bhatia Dec 2004

Characterization Of Cyp2d Protein From Human Brain Cerebellum, Deepak Bhatia

Graduate Theses, Dissertations, and Problem Reports (ETD)

To date, knowledge in characterization of CYP proteins has been limited to immunoblotting, RT-PCR, immunohistochemistry and so forth; therefore, it is the intention of this study to investigate: (1) What kind of CYP2D protein is present in brain with modern proteomic tools; (2) Whether, CYP2D6 in brain is same as the liver CYP2D6; and (3) If CYP2D7 is present, can CYP2D6 polymorphism be found in the brain?;To answer these questions, this study used a one-step method of isolation of protein by immunoprecipitation followed by its identification using 2D-blots, nanospray LCMS, immunoblots and immunohistochemistry. Probing of immunoprecipitated proteins with polyclonal CYP2D6 …

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Specific Aspects Of Social Anxiety Related To Children's Peer Sociometric Status, Abby H. Friedman Dec 2004

Specific Aspects Of Social Anxiety Related To Children's Peer Sociometric Status, Abby H. Friedman

Graduate Theses, Dissertations, and Problem Reports (ETD)

The present study examined the association between specific aspects of social anxiety and sociometric status. Participants included 268 children in grades 4, 5, and 6. The children completed the Social Anxiety Scale for Children-Revised (SASC-R) and the Social Phobia and Anxiety Inventory for Children (SPAI-C). A sociometric nomination procedure was used to categorize participants into sociometric status groups (i.e., neglected, rejected, controversial, popular, and average). Results replicated and extended previous literature. Neglected children scored the highest on both measures of social anxiety, followed by rejected children. This was one of the first investigations to associate socometric status with SPAI-C factor …

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Spatial And Seasonal Variation In Brook Trout Diet, Growth, And Consumption In A Complex Appalachian Watershed, David W. Thorne Dec 2004

Spatial And Seasonal Variation In Brook Trout Diet, Growth, And Consumption In A Complex Appalachian Watershed, David W. Thorne

Graduate Theses, Dissertations, and Problem Reports (ETD)

I quantified brook trout diet, growth, and consumption in the upper Shavers Fork watershed from May 2002--October 2003. Seven study sites were selected to represent small tributary, large tributary, and mainstem habitats within the watershed. The objectives of the study were to determine if diet, growth, and consumption in brook trout were dependent on fish size, season, and location within the watershed. Fish diets were sampled and categorized into six prey type groups to determine variability in prey composition and diet mass. Mark-recapture was used to measure growth in individual fish between sampling seasons and the growth information was then …

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Factors Underlying Stalking And Harassing Behavior In A College Population, Jill Johansson-Love Dec 2004

Factors Underlying Stalking And Harassing Behavior In A College Population, Jill Johansson-Love

Graduate Theses, Dissertations, and Problem Reports (ETD)

At the high end of unwanted pursuit behavior is stalking. This study, using questionnaires, investigated a sample of 48, college females, identified as potential stalkers. Factors examined included: demographic information, social desirability, psychological functioning, attachment, motive, rape myth acceptance, adversarial sexual beliefs, criminal thinking styles, and the actual unwanted pursuit behavior. Hypotheses regarding the criminal thinking styles of the individuals engaging in harassing and stalking behavior were supported at the .05 level. These findings indicate that harassers and stalkers exhibit criminal thinking patterns, such as sacrificing internal control to exert control over the external environment and justifying behavior by externalizing …

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Needed Communication Skills During Initial Employment As Perceived By Graduates Of The West Virginia University Davis College Of Agriculture, Forestry And Consumer Sciences, Jessica R. Rollins Dec 2004

Needed Communication Skills During Initial Employment As Perceived By Graduates Of The West Virginia University Davis College Of Agriculture, Forestry And Consumer Sciences, Jessica R. Rollins

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of the study was to determine communication skills used during initial employment by graduates of the Davis College of Agriculture, Forestry and Consumer Sciences who were enrolled in the agricultural and natural resources communications (AgEE 421) course. The population consisted of 70 2001--2002 graduates of West Virginia University Davis College of Agriculture, Forestry and Consumer Sciences who were enrolled in agricultural and natural resources communications (AgEE 421) during their collegiate careers. A descriptive research design was used for the study. A major finding of the study was the beneficial effects of educational training in communications skills prior to …

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Software Risk Assessment Based On Uml Models, Kalaivani Appukkutty Dec 2004

Software Risk Assessment Based On Uml Models, Kalaivani Appukkutty

Graduate Theses, Dissertations, and Problem Reports (ETD)

Risk is the possibility of suffering loss. Risks identified during the early stages of software development are easier and cheaper to handle by making changes to the software architecture. This thesis presents methodologies to assess software risk using Unified Modeling Language (UML) specifications of the software from the early design stages. We present methodologies to assess two types of software risk: Requirements-based risk and Performance-based risk. In assessing requirements-based risk, each requirement is mapped to a specific operational scenario in UML. The risk factor of a scenario in a failure mode is obtained by combining the probability of failure of …

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Starvation-Induced Alterations In Hepatic Lysine Metabolism In Different Families Of Rainbow Trout (Oncorhynchus Mykiss), Angela Higgins Dec 2004

Starvation-Induced Alterations In Hepatic Lysine Metabolism In Different Families Of Rainbow Trout (Oncorhynchus Mykiss), Angela Higgins

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study focused on lysine catabolism by the lysine alpha-ketoglutarate reductase (LKR) pathway in rainbow trout (RBT). Selective breeding based on feed efficiency in 2 strains (A and B) of RBT generated 2 families within each strain. Eight fish from each of the four families were randomly allotted to individual tanks. Fish were fed until satiation for 3 wks at which time four fish within each family were randomly selected for 2 wks of starvation. After the 2 wk starvation, all fish were harvested. Hepatic in-vitro LKR activity and lysine oxidation (LOX) were measured as was LKR mRNA abundance. Strain …

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Factors Controlling Landslide Initiation As A Result Of July 2001 High-Precipitation Events In A Section Of The Lower New River Gorge, West Virginia, M. Patrick Kish Dec 2004

Factors Controlling Landslide Initiation As A Result Of July 2001 High-Precipitation Events In A Section Of The Lower New River Gorge, West Virginia, M. Patrick Kish

Graduate Theses, Dissertations, and Problem Reports (ETD)

Several geologic and physical factors affect the location of landslides associated with the July 2001 high precipitation events in Lower New River Gorge, West Virginia. The surficial geology of the heavily mined landscape was mapped using ArcGis 8.3 and four specific factors related to the landslides were identified. Road building was shown statistically to have a positive influence on the location of landslides. Slope aspect, slope angles, and elevation were also shown to have strong relationships with landslide initiations.;A landslide initiation risk map was created by overlaying the physical and geological factors favorable for landslide initiation. The risk map outlines …

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Exposures To Silica And Inducers Of Xenobiotic Metabolism In The Rat Lung, Lori A. Battelli Dec 2004

Exposures To Silica And Inducers Of Xenobiotic Metabolism In The Rat Lung, Lori A. Battelli

Graduate Theses, Dissertations, and Problem Reports (ETD)

CYP1A1 metabolizes polycyclic aromatic hydrocarbons (PAHs), such as those in cigarettes, to reactive intermediates which interact with DNA and lead to cancer. Silica is a lung carcinogen. Epidemiology studies of silica and lung cancer are not all positive. A possible explanation for these inconsistencies may be that silica is a modifier of PAH metabolism and, thus, cigarette smoke carcinogenesis. We hypothesize that crystalline silica exposure alters CYP1A1 expression, thereby modifying lung cancer risk. Rats exposed to both crystalline silica and the model PAH, beta-naphthoflavone (NF), a CYP1A1 inducer have significantly decreased CYP1A1 enzymatic activity and CYP1A1 protein expression. In the …

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Depositional Environments And Sequence Stratigraphy Of The Rockwell-Price Formation In Western Maryland, South-Central Pennsylvania, And Northern West Virginia, Darin A. Dolezal Dec 2004

Depositional Environments And Sequence Stratigraphy Of The Rockwell-Price Formation In Western Maryland, South-Central Pennsylvania, And Northern West Virginia, Darin A. Dolezal

Graduate Theses, Dissertations, and Problem Reports (ETD)

The Price Formation of northern West Virginia consists of Upper Devonian - Lower Mississippian siliciclastic rocks that are primarily marine. Members of the Price Formation include from oldest to youngest the Oswayo, Cussewago, Riddlesburg Shale, and Rockwell. Rocks of the Price Formation are considered to be of genetic and temporal equivalence to the Rockwell Formation in south-central Pennsylvania, western Maryland, and the eastern West Virginia panhandle.;The research attempts to (1) interpret sedimentary facies and their depositional environments and (2) identify stratigraphic relationships across six outcrops in the central Appalachian basin. Outcrops have been measured and described along a 150 km …

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Synchronization For Capacity -Approaching Coded Communication Systems, Jian Sun Dec 2004

Synchronization For Capacity -Approaching Coded Communication Systems, Jian Sun

Graduate Theses, Dissertations, and Problem Reports (ETD)

The dissertation concentrates on synchronization of capacity approaching error-correction codes that are deployed in noisy channels with very low signal-to-noise ratio (SNR). The major topics are symbol timing synchronization and frame synchronization.;Capacity-approaching error-correction codes, like turbo codes and low-density parity-check (LDPC) codes, are capable of reaching very low bit error rates and frame error rates in noisy channels by iterative decoding. To fully achieve the potential decoding capability of Turbo codes and LDPC codes, proper symbol timing synchronization, frame synchronization and channel state estimation are required. The dissertation proposes a joint estimator of symbol time delay and channel SNR for …

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Three Essays On Public Economics And Public Finance, Yousam Choi Dec 2004

Three Essays On Public Economics And Public Finance, Yousam Choi

Graduate Theses, Dissertations, and Problem Reports (ETD)

In the first essay, we examine the conditions under which the regulatory process leads to collusion, and if there is collusion, whether it will be observed in the political or bureaucratic sector. The political cost disciplines the politician, while monitoring intensity limits the bureaucrat's discretion. According to our model, high political pressure is critical to achieve a state with no collusion between agents. If the political cost is relatively small, higher penalties on the bureaucrat will just open the possibility of political corruption. In a politician's initiative regime, if the transfer offered to the politician in exchange for legislative effort …

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Modeling And Real-Time Feedback Control Of Mems Device, Limin Wang Dec 2004

Modeling And Real-Time Feedback Control Of Mems Device, Limin Wang

Graduate Theses, Dissertations, and Problem Reports (ETD)

Applying closed-loop control to a MEMS devices not only can handle the abnormal behaviors caused by manufactory imprecision or device failure, enabling MEMS devices to survive in critical conditions, but also can increase the application where MEMS devices are used to drive components under varying load conditions. This study mainly focuses on the effort of closed-loop control on the Lateral Comb Resonator (LCR) MEMS device. The success of closed-loop control has been achieved on lateral comb resonator with novel integrated through wafer optical monitoring technique.;Availability of a system model and feedback signals are mandatory conditions for the implementation of closed-loop …

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Interactions Of Allelopathy And Competition Affecting Ziziphus Spina-Christi And Prosopis Juliflora Seedlings, Thobayet S. Alshahrani Dec 2004

Interactions Of Allelopathy And Competition Affecting Ziziphus Spina-Christi And Prosopis Juliflora Seedlings, Thobayet S. Alshahrani

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study consists of two parts, provides data on the interference between Ziziphus spina-christi, native to Saudi Arabia, and Prosopis juliflora, an introduced species. Dry leaves from both species were milled and used to prepare extracts using 0g/l, 5g/l, 20g/l, 40g/l, 60g/l, and 100 g/l of dried leaves. Leaf extract of P. juliflora was used to irrigate Z. spina-christi with 120 ml weekly over a 7-month growth period, and vice versa. Plant height, plant diameter, number of leaves, leaf area, chlorophyll content, total root length, number of root tips, root diameter, root surface area, root volume, shoot dry weight, root …

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