Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 417 for “"Indirect effects"”.
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Direct and indirect effects of gamma radiation on yeast cells
Thesis (M.S.)--Michigan State University. Dept. of Food Science, 1967
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Predators alter host-parasite interactions via trait-mediated indirect effects
… with their prey. These direct interactions can indirectly alter the interactions between prey and other community members. For example, predators can alter prey life history, behavior, or morphology resulting in an indirect change in the interaction between their prey and another species …
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Direct and Indirect Effects of Authoritarianism on Policy Preferences in Canada
… exert a direct effect on policy preferences and indirect effects through prejudice, ideology, and partisanship. Testing this model on data from the Canadian Election Study, I find evidence that authoritarianism cuts across the political spectrum; is not activated by threat, but rather has greater …
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Component Processes in the Predictors of Reading Achievement: Direct and Indirect Effects
… related to reading predictors but instead was indirectly influenced by sight vocabulary. Contrary to the presented hypothesis, phonological awareness was not found to mediate the influence of working memory in a sample of poor readers. However, working memory skills were closely related to …
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Direct and indirect effects of native and invasive plants on mosquito ecology
… hosts. This dissertation examines direct and indirect effects of understory shrubs, including species both native and invasive to North America, on the ecology of Culex pipiens, an important vector of West Nile virus in the northeastern and midwestern United States. Laboratory and field …
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Indirect effects between deer, mice, and the gypsy moth in a forest community
… many species in a forest through both direct and indirect effects. One species that deer may indirectly affect is the gypsy moth, whose pupae are preyed upon by the white-footed mouse. Through alterations to understory habitat of mice, deer may reduce mouse predation on gypsy moth pupae. In this …
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Garfield County resident perceptions of the indirect effects of the 2002 Winter Olympics
This study examined rural resident perceptions of a nearby mega-event. Tourism leaders can gauge resident perceptions and thereby plan development in conjunction with the local people, not in spite of them; It is anticipated that the 2002 Winter Olympics will have some impact on Garfield County, …
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The Direct and Indirect Effects of Insectivory by Birds in Two Neotropical Forests
… lowland tropical forests, I tested whether birds indirectly defend canopy and understory plant foliage from arthropod herbivores. The two forest sites differed in age, tree species diversity and rainfall seasonality. Birds significantly reduced local arthropod densities in the canopy of a …
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Plant-plant and plant-insect interactions: Direct and indirect effects of plant neighbors
In greenhouse and field experiments using Amaranthus retroflexus and Chenopodium album, I investigated whether competition and artificial leaf herbivory acted synergistically in depressing plant growth (height, diameter, and vegetative mass) and reproduction (reproductive mass and time of …
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Direct and indirect effects of alpha-particle irradiations of human prostate tumor cells
… alpha-particle irradiator. Firstly, the direct effects of the alpha-particle irradiation of DU-145 cells were studied using the clonogenic assay, the comet assay and the micronucleus assay. A novel co-culture system was then designed to study the bystander effect transmitted through the cell …
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Training Siblings of Children with Autism to Instruct Play: Acquisition, Generalization, and Indirect Effects
A multiple baseline design was employed to evaluate the effectiveness of a sibling training package including modeling, role-play, and feedback on play and engagement between children with autism and their siblings. The results of two experiments suggest that, following training, siblings of …
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Direct and indirect effects of school learning variables on black 10th graders' academic achievement
… of this study was to estimate the direct and indirect effects of certain school learning variables on the academic achievement of Black 10th graders. Simultaneously looking at variables associated with student background characteristics (i.e., gender and socioeconomic status); the school …
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Indirect effects of agricultural intensification on tree swallow (Tachycineta bicolor) foraging behaviour, body condition, and physiology
… causal link. Declines may be influenced indirectly by agriculturally-driven reductions in the abundance of the swallow’s main diet of aerial insects through increased agrochemical use, wetland drainage and cropping intensity. My objectives were to determine how aerial insect abundance and …
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Indirect Effects of Elevated Carbon Dioxide on Members of Three Herbivorous Feeding Guilds on Soybean, Glycine Max
P. japonica prefers damaged leaves grown under elevated CO2 over damaged leaves grown under ambient CO2, which may be the result of increased complexity in volatile compounds in leaves grown under elevated CO2. Increased amounts of flavonols and decreased amounts of isoflavonoids in leaves grown …
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Direct and Indirect Effects of Elevated Carbon Dioxide and Ozone on the Canopy of a Soybean Agroecosystem
… rising atmospheric CO2 and O3 will directly and indirectly alter canopy structure and scale to affect ecosystems. I determined how leaf area index (LAI) was directly affected by elevated [CO 2] and [O3]. By increasing photosynthetic efficiency, elevated [CO2] may increase maximum LAI. However, …
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Collateral Benefits Of A Brief, Couple-Focused Intervention On Coparenting: Indirect Effects Through Couple Relationship Quality And Conflict
… parents coordinate in their parenting roles), indirectly through improvements in couple relationship quality and conflict frequency, respectively. A community sample of couples with young children (N = 140 couples; 280 participants; 91.4% heterosexual) participated in a longitudinal randomized …
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MATERNAL COMMUNICATION AT MENARCHE: EVALUATING DIRECT AND INDIRECT EFFECTS ON AGE AT FIRST SEXUAL INTERCOURSE IN YOUNG ADULT WOMEN
… maternal communication at menarche and its effects on early sexual decision-making in young adult women. Drawing on principles from Bandura’s social cognitive learning theory and communication privacy management theory, I predicted that certain types of maternal communication at menarche …
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Health-Related Quality of Life in the Working Uninsured: Conditional Indirect Effects Of Perceived Stigma via Vitality and Interpersonal Needs
… stigma and each outcome. Subsequent conditional indirect effect analyses found that thwarted belongingness moderated the mediation effect for some of the models by impacting the relation between stigma and subjective vitality or by moderating the relation between subjective vitality and the …
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