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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Tissue specific differences between endothelia : expression and presentation of chemokines and their receptors

Hillyer, Philippa January 2003 (has links)
No description available.

Markets and opportunities : an explanation of economic life-chances

Morillas-Martínez, Juan-Rafael January 2003 (has links)
No description available.

Essays on the economics of heterogeneity

Gudat, Nils-Holger January 2017 (has links)
The analysis of the effects of heterogeneity on aggregate economic outcomes has seen a resurgence in the recent macroeconomic literature. The exponential increase in computer power over the last decades has allowed researchers to solve ever more complex theoretical models with meaningful heterogeneity along various dimensions, while at the same time bringing ever more granular microlevel data to the table when testing the model predictions. This thesis explores two varieties of this recent vintage of models of heterogeneity. The first part of the thesis investigates the implications for wealth distributions of combining the standard lifecycle incomplete markets model of household consumption with income processes featuring heterogeneity in individual-specific growth rates, which households can learn about over the course of their working life. To this extent, first the recent literature on partial insurance and models of wealth inequality is reviewed. Then, income processes with profile heterogeneity are estimated from PSID and BHPS data. The results confirm the findings of previous studies that allowing for profile heterogeneity significantly lowers the estimated persistence and innovation variance of persistent shocks to household income, and documents substantial variation in the estimated parameters of the income process across time periods and measures of household income. The estimated income processes obtained are then used in a quantitative model of household consumption and saving in order to investigate the implications for the model predictions on the wealth distribution. The model is calibrated to empirical wealth distributions obtained from the SCF and the BHPS, and it is shown that the inclusion of individual-specific growth rate heterogeneity in income severely deteriorates the model's ability to fit the shape of the data. Comparative statics exercises are performed to identify the drivers in the model's failure to match the empirical profile of wealth holdings, which show that it is precisely the two key parameters which differ between the standard AR(1) model and the heterogeneous profile model, the persistence and variance of the permanent shock to household income, which drive model fit. The second part of the thesis looks at heterogeneity on the production side of the economy and its implications for international trade. Following an existing approach in the literature, we develop testable implications of the Melitz and Ottaviano (2008) model of trade, in which firms differ in their productivity and have to make production and exporting decisions in the face of costs to trade. Applying an estimation strategy previously used in the literature, we find weak support of the model's predictions in data for 64 manufacturing industries in the NAFTA member countries Canada, Mexico and USA. We then test additional model predictions by constructing a measure of entry conditions by industry based on firm turnover, which allows us to divide our sample into fixed and free entry industries. Furthermore, we include the effects of third country tariff barriers on the relative performance of two trading partners' industries. While the results are broadly in line with model predictions, we find some evidence of violations of the predictions in the data.

An econometric analysis of family formation

Aassve, Arnstein January 2000 (has links)
No description available.

Genetic structure and reproductive partitioning in a primitively eusocial wasp

Bolton, Alan Richard January 2002 (has links)
No description available.

The heterogeneity and transplantation progression of spontaneous rodent tumours as measured by flow cytometry

Davison, Susan January 1989 (has links)
No description available.

Macrophage membrane glycoproteins defined by wheat germ agglutinin

Rabinowitz, S. S. January 1988 (has links)
No description available.

Strategic complementarity and endogenous heterogeneity in oligopolistic markets

Knauff, Malgorzata 10 January 2006 (has links)
The thesis consists of five chapters. The first of them contains introduction. Chapter 2 considers a broad class of two player symmetric games, which display a fundamental non-concavity when actions of both players are about to be the same. This implies that no symmetric equilibrium is possible. We distinguish different properties of the payoff functions, like strategic substitutes, complements and quasi-concavity, which are not necessarily imposed globally on the joint action space. For each of these cases we provide conditions to secure the existence of exclusively asymmetric equilibria. Moreover we consider the case of convex payoff functions. A number of applications from industrial organization and applied microeconomics literature are provided. In Chapter 3 we generalize to the extent possible the known results for the case of games with one-dimensional action sets to the general case of games with strategic complemantarities with action spaces that are complete lattices. One key issue addressed is the extent to which all equilibria tend to be symmetric for the general case of multi-dimensional (i.e. only partially ordered) strategy spaces. We find that the scope for asymmetric equilibrium behavior is definitely broader than in the one-dimensional case, though still quite limited. Another key question investigated here is whether asymmetric pure strategy Nash equilibria are always Pareto dominated by symmetric pure strategy Nash equilibria. While this need not hold in general for games with strategic complementarities, we identify different sufficient conditions that guarantee that such dominance holds. In Chapter 4 we deal with the effects of market transparency on prices in the Bertrand duopoly model. The analysis is intuitive and simple when we consider two types of strategic interaction between firms in an industry - strategic complementarities and substitutabilities. We present also traditional comparative statics analyses, demanding additionally some other regularity conditions, to cover those problems, when neither of these situations is the case. In the first case, the results are close to conventional wisdom, especially, when in the same time products are substitutes. Namely, equilibrium prices and profits are always decreasing in transparency level, while the consumer's surplus is increasing. For a special case when supermodularity holds, but products are not substitutes, the result on profits is not valid anymore. Considering price competition with strategic substitutes, an ambiguity in the direction of change of prices appears. This leads to ambiguity concerning equilibrium profits and surplus changes caused by increasing transparency. In Chapter 5 we provide general conditions for Cournot oligopoly with product differentiation to have monotonic reaction correspondences. We give a proof for the conditions stated by Vives (1999). Moreover we elaborate more general requirements. They allow for identifying increasing best responses even in case inverse demand is submodular, and similarly, decreasing best responses in case of supermodular inverse demand. Examples illustrating the scope of applicability of these results are provided.

A study of cellular heterogeneity and therapeutic resistance in cultures of human lung cancer

Walls, G. A. January 1988 (has links)
No description available.

An investigation into the structure and dynamics of the DNase domain of colicin E9 by heteronuclear NMR spectroscopy

Whittaker, Sara Britt-Marie January 1998 (has links)
No description available.

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