Alcohol Use In Mexican-Americans By Nativity: The Role Of Ethnic Identity, Acculturation, And Acculturative Stress

The present study examined alcohol use disorder symptoms among Mexican-Americans. Participants consisted of a community-based sample of 237 Mexican-American adults living in the Midwest United States. The role of nativity status and cultural variables in alcohol use disorder symptoms was explored. Specifically, ethnic identity, acculturation, and acculturative stress were used to predict membership into high and low alcohol use disorder symptom groups among U.S.-and foreign-born Mexican-Americans. Additionally, gender, ethnic identity, and acculturative stress were tested as moderators in the relationship between acculturation and alcohol use disorder symptoms. Among U.S.-born participants, only ethnic identity was found to be predictive of alcohol use disorder symptoms, such that higher ethnic identity was related to fewer alcohol use disorder symptoms. Among foreign-born participants, ethnic identity was also predictive of few alcohol use disorder symptoms. Additionally, increased pressure against acculturation was predictive of higher alcohol use disorder symptoms for foreign-born participants. Among the sample as a whole, those with low Latino Orientation and high pressure against acculturation reported more alcohol use disorder symptoms. These results highlight the protective effect of ethnic identity and the need for further research that examines nativity status, acculturation, and specific acculturative stressors in regard to alcohol use disorder symptoms among Mexican-Americans

A GENERALIZED INDEX OF MARKET POWER

This paper analyses two approaches to measuring market power -the commonly used Lerner index and a range of exploitation measures-. It is argued that the Lerner index is designed to quantify market power from the supply side, and the exploitation measures are designed to quantify market power from the demand side, and that those two approaches do not always behave in a symmetric way, since they do not always have the same bounds. To sort out these potentially undesirable properties, this paper proposes a new general index to measure market power, which is symmetrical in the sense that it is bounded between cero and one, regardless of whether the market power comes from the supply or the demand side. The index proposed allows for the presence of more than one firm and for the existence of conjectural variations.Market Power, Mark Up, Mark Down, Lerner Index, Exploitation Measures, Industrial Organization, Conjectural Variations

A THEORY OF NATURAL MARKET STRUCTURES: REGULATION, R&D, FDI, INTERNATIONAL TRADE AND A FEW CURIOSITIES

The theories of natural market structures have been well known in economics for a long time. In this paper, a framework for such natural market structures is developed, where natural monopoly, natural oligopoly, perfect competition and monopolistic competition are special cases. The paper explains why with increasing returns to scale at the level of the firm; a given market size; a continuum of firms; complete information and homogeneous goods, there is usually a margin for regulation -most notably when the number of firms in the market is low. The paper shows that R&D, FDI and trade liberalization can improve welfare, and that they can be complements or imperfect substitutes to the need for market regulation. It is argued that when markets are expected to grow, or technologies to change, avoiding policies that prevent entry of firms -such as licences- can reduce significantly the need for regulation while allowing for a more efficient allocation of resources. It is also argued that the need for market regulation can be better explained by the exploitation of economies of scale, than by the existence of economic rents. Finally, the paper shows that when there is a discrete number of firms, the level of profits and the regulatory margins, can be described by a saw""Economies of Scale, Natural Monopoly, Natural Oligopoly, Monopolistic Competition, Regulation, International Trade, Profit Saw, Regulation Saw

INTERNATIONAL TRADE, MIGRATION AND INVESTMENT WITH HORIZONTAL PRODUCT DIFFERENTIATION AND FREE ENTRY AND EXIT OF FIRMS

This paper builds on a circular road model of the world with horizontal product differentiation and free entry and exit of firms, to derive results that can be applied in industrial organization, international trade and political economy. The model shows that freer international trade increases welfare -with ideal variety preferences through the exploitation of economies of scale and better allocative efficiency; that all participating countries gain from trade, and that smaller countries have more to win from free trade than larger countries. The model also explains that there may be adjustment costs when liberalizing trade and thus, political resistance to trade liberalization. International migration can also be analyzed with the model, showing the possibility of suboptimal migration flows and political barriers to the exit of national citizens. The model suggests that foreign direct investment will be welfare improving for the source country in the short run, and for the receiving country in the long run. Finally, the model provides a micro foundation for the use of demand curves with constant and negative slopes.Monopolistic competition, horizontal product differentiation international trade, international migration and foreign direct investment

Computational modelling of the behaviour of biomarker particles of colorectal cancer in fecal matter

Colorectal adenocarcinoma is one of the carcinogenic diseases that is increasing the morbidity and mortality rates worldwide. The disease initially occurs through the segregation of biomarker substances in the human system without manifesting symptoms that affect the health of the carrier. Early detection would allow the application of more effective treatments, less invasive procedures and reduce the development of cancer. The purpose of this investigation was the elaboration of a mathematical model and the development of computational simulations to visualize the behavior of biomarker particles in transit through the colon. The flow conditions, properties of the viscous medium and biological regions of interest were established. Constitutive models, numerical conditions and solution strategies were determined. A numerical grid was used to represent the model of the colon and the human feces that carry the bioparticles (biomarkers). The results indicated the trajectories of the bioparticles in the fecal mass and the interactive movement with the natural contractions of the colon. The analysis of the movement of the biomarker particles can provide future less invasive alternatives for the detection in real time of the cancer by means of the implantation of biosensors in the walls of the colon

The Llano Grande Grant: The Transformation of Land Ownership in The Rio Grande Valley, 1749-1910

The history of the Llano Grande is an important part of Rio Grande Valley life. The thesis presented will analyze the legal ownership of a single land grant from 1749-1910. The modern land tenure in the Rio Grande Valley has its roots in the Spanish land grants. By studying a micro-history of a single land grant we can understand how the land ownership of the Llano Grande and the Rio Grande Valley changed throughout an entire century. The land ownership of the Llano Grande addresses how land was transferred Spanish to Mexican and to Anglo land owners. Also, the rise of Anglo American land ownership in the Llano Grande and their control of Hidalgo County politics. Going beyond the land tenure of the Llano Grande, this thesis will address the historical factors that led to the breakdown of the grant and explain the blueprints and foundations of land tenure in present day in the Rio Grande Valley

Biculturalism, Bilingualism, & Executive Function Among U.S. Latinos: Implications for Cognitive Reserve

The current study was an exploratory investigation of the cultural constructs of biculturalism and bilingualism as predictors of executive function among a community-based sample of 25 older adult Latinos living in the U.S. The potential moderating effects of education and bicultural identity integration were also examined. Using regression analyses, biculturalism and bilingualism were examined independently as predictors of performance on three separate tasks of executive function: trail making tests, a phonemic fluency task, and a clock drawing task. Bilingualism was not found to predict performance on any of the executive functioning tasks. In the overall sample, biculturalism also was not found to predict performance on tasks of executive function. Additional analyses; however, revealed that among women in the sample, biculturalism was predictive of better performance on a phonemic fluency task, specifically among those who were high in cultural harmony, an aspect of bicultural identity integration. Also noteworthy was the finding that biculturalism was actually related to worse phonemic fluency performance among non U.S. educated individuals, contrary to stated hypotheses. Findings are discussed within the framework of cognitive reserve theory. This is the first study to examine biculturalism as a potential predictor of executive functioning and the first to suggest that biculturalism may contribute to cognitive reserve. The study highlights the complexities of examining cultural variables in cognition research, as well as the need for future work in this area

Size effects in submicron exchange bias square elements

The behavior of submicron exchange bias square elements has been investigated for systems containing metallic polycrystalline layers. Numerical simulations using a simple theoretical model show that the exchange bias for such elements can increase and/or decrease depending on the microstructure of the antiferromagnetic layer and, in particular, its grain size distribution. The predictions are based on a granular model of exchange bias that accounts for grain cutting at the edges of the nanoelements that takes place during ion milling/etching. This leads to distributions of exchange bias fields that can be quite broad, especially in sub-250 nm elements