Preliminary Study on Treatment of Contaminated Groundwater from the Taylorville Gasifier Site

Groundwater and soil at the site of an abandoned coal gasification plant in Taylorville, Illinois have been contaminated with compounds associated with coal conversion process waters. A preliminary study to assess the feasibility of using ethanol as a means of increasing the solubility of compounds adsorbed within the soil matrix followed by treatment of the ethanol/groundwater extract in an expanded-bed anaerobic granular activated carbon (GAC) reactor was conducted. Results of the study indicate that compounds in the groundwater are highly adsorb able on GAC, and do not interfere with the anaerobic degradation of ethanol in the reactor. Soil extractions with varying ethanol/water ratios were able to remove many additional low water solubility compounds from the soil.ENR Contract Number HWR87035published or submitted for publicationis peer reviewe

The revolving door: A closer look at major factors in volunteers’ intention to quit

In nonprofit organizations, volunteer coordinators deal with high rates of volunteer turnover due, in part, to increased levels of volunteer burnout. This study sought to identify how burnout can help explain volunteers’ intention to quit and identify two potential antecedents of burnout: voice and role ambiguity. Specifically, it is hypothesized that volunteer voice and role ambiguity affects volunteers’ intention to quit through their relationship with volunteer burnout. Data were obtained from volunteers working in an animal welfare organization in the western United States (N = 151). An online survey was administered to volunteers who responded to a variety of questions and scales concerning their experiences as volunteers in an animal welfare organization. Structural equation modeling was used to test the mediation hypotheses. The findings provide tentative support that volunteer burnout mediates the relationship between two potential predictors of burnout (e.g., perception of voice and role ambiguity) and intention to quit. Consistent with conservation of resources theory, volunteers who are drained of their cognitive resources through dealing with a lack of voice and ambiguous volunteer role situations experience increased burnout. The practical and theoretical significance of these findings are discussed

Essays on intrinsic motivation and conflict inside organizations.

The first chapter of this thesis explores the link between a government's political power and its choice between patronage and meritocracy in the recruitment and promotion of state bureaucrats. Evidence suggests that where political power is concentrated, governments are less likely to renounce patronage. A theoretical analysis suggests two reasons for this negative correlation. First, under patronage, governments can ensure bureaucratic competence only when they are powerful, while meritocracy guarantees competence regardless of the distribution of power. Secondly, a weak government introduces meritocracy to prevent the new incoming government from exerting its political influence over the composition of bureaucracy via patronage. The second chapter (joint paper with Maitreesh Ghatak) examines why not-for-profits are most active in mission-based sectors and why they are able to attract more motivated workers. Francois (2000) argues that choosing not-for-profit status enables the firm's manager to commit to a hands-off policy, and consequently to use worker's intrinsic motivation more effectively. However, it can be shown that this is not always in the interest of the manager and that it is never in the interest of the worker. Not-for-profits only emerge if there is an oversupply of motivated labour. The third chapter studies the role of political neutrality as a norm for state bureaucrats. The norm of political neutrality can be interpreted as an agreement to keep the bureaucrat's preferences hidden. Drawing on a theoretical analysis of the conflict of interest between bureaucrat and politician, this chapter shows that having no information on the bureaucrat's political views can improve the communication between politician and bureaucrat. This way, political neutrality can improve public decision making

Managing soybean aphid in Iowa: An economic analysis

The introduction of soybean aphid and soybean rust to North America led to numerous insecticides and fungicides becoming available for use on soybean. Frequent outbreaks of soybean aphid along with reports of increased yields due to fungicide application, even in the absence of foliar disease, has resulted in widespread use of tank mixes. The popularity of tank mixes (a co-application of insecticide and fungicide) as a management tool is increasing. Many pest management programs that recommend this strategy apply pesticides based on soybean growth stage

Gas-borne particles with tunable and highly controlled characteristics: for nanotoxicology studies

For nanotoxicology investigations of air-borne particles to provide relevant results it is ever so important that the particle exposure of, for example cells, closely resembles the “real” exposure situation, that the dosimetry is well defined, and that the characteristics of the deposited nanoparticles are known in detail. By synthesizing the particles in the gas-phase and directly depositing them on lung cells the particle deposition conditions in the lung is closely mimicked. In this work we present a setup for generation of gas-borne nanoparticles of a variety of different materials with highly controlled and tunable particle characteristics, and demonstrate the method by generation of gold particles. Particle size, number concentration and mass of individual particles of the population are measured on-line by means of differential mobility analyzers (DMA) and an aerosol particle mass analyzer (APM), whereas primary particle size and internal structure are investigated by transmission electron microscopy. A method for estimating the surface area dose from the DMA-APM measurements is applied and we further demonstrate that for the setup used, a deposition time of around 1 h is needed for deposition onto cells in an air–liquid interface chamber, using electrostatic deposition, to reach a toxicological relevant surface area dose

Proton translocating nicotinamide nucleotide transhydrogenase from E. coli. Mechanism of action deduced from its structural and catalytic properties11This review is dedicated to the memory of Professor Lars Ernster.

AbstractTranshydrogenase couples the stereospecific and reversible transfer of hydride equivalents from NADH to NADP+ to the translocation of proton across the inner membrane in mitochondria and the cytoplasmic membrane in bacteria. Like all transhydrogenases, the Escherichia coli enzyme is composed of three domains. Domains I and III protrude from the membrane and contain the binding site for NAD(H) and NADP(H), respectively. Domain II spans the membrane and constitutes at least partly the proton translocating pathway. Three-dimensional models of the hydrophilic domains I and III deduced from crystallographic and NMR data and a new topology of domain II are presented. The new information obtained from the structures and the numerous mutation studies strengthen the proposition of a binding change mechanism, as a way to couple the reduction of NADP+ by NADH to proton translocation and occurring mainly at the level of the NADP(H) binding site