Effects of copper, zinc and selenium status on performance and health in commercial dairy and beef herds: retrospective study

A retrospective study using analysis of plasma copper and zinc, and erythrocyte glutathione peroxidase from 2 080 dairy and beef cow herds was conducted to evaluate the relationship between trace-element status and production, reproduction and health in cows and their calves. Classification of the herd status as deficient, marginal, low-adequate or high-adequate was based on the lower tercile of individual values. Odds ratios for each disorder in herds were calculated by multivariable stepwise logistic regression. Inadequate copper status was not associated with adult disorders, but was an important risk factor for poor calf performance or health. Selenium deficient status was associated with most studied disorders in cows, and both deficient and marginal herd status were strongly associated with poor health of calves, particularly with increased risks of myopathy and infectious diseases. Zinc insufficiency was strongly associated with low milk production and impaired locomotion in dairy herds, and was also associated with diarrhoea and poor growth in calves. Because a low-adequate status increased the risk of many disorders in adults and calves, we propose to classify herds as deficient and marginal when the lower terciles of plasma zinc concentration are below 12 and between 12 and 14 lmol/l respectively

The Italian Market as an Incubator

The Italian Market is the oldest outdoor market in the US. In the late 1800s, immigrant communities settled here to sell fresh fruits and vegetables out of handcarts. That tradition continues to this day. This study shows how the market functions as a business incubator for immigrant businesses. Much like start-up incubators for technology firms, the market provides low cost entry, existing social networks, shared resources, opportunities to learn on the job and make mistakes, and a wide range of productive types of inefficiency . On the other hand, there are few opportunities for growth for these firms beyond the incubation stage. Few immigrant business owners expect to grow their businesses beyond basic subsistence and to pursue the American Dream . Rather immigrant business owners envision growth in terms of better opportunities for their children, through education which will enable them to access to professional careers away from small business.https://repository.upenn.edu/socialsciencestudio_presentations/1001/thumbnail.jp

Are members of the Hungarian minority in Romania part of the Romanian political community?

The history of the Romanian-Hungarian relations is burned by a series of failures, as far as attempts aiming to provide patterns of integration of the Hungarian minority are concerned. These failures, together with the tradition of institutionalized mistrust of the Romanian authorities represented a difficult legacy for the post-1989 political projects and ethno-political strategies on both sides. Since 1989, the situation of the Hungarian minority in Romania has improved significantly in many concerns. In spite of the undeniable achievements, the conflicting interests of the two communities could not be reconciled, and the options of the Romanians and Hungarians, as far as the issue of the integration is concerned, continue to differ in essential terms. The dominant patterns of public opinion yield conflicting identity structures and competing ethno-political strategies, which raise the intriguing question: on what grounds can Hungarians in Romania be considered as part of the Romanian political community? The paper tries to offer an answer to this question by comparing the dominant trends in conceptualizing the term political community with recent research results which bare, according to the author, the evidence of those identity structures and ethno-political strategies which divide the Romanian political community along ethnic fault-lines. The paper reaches the conclusion that if we bare in mind, following Elizabeth Frazer, the "thin" interpretation of the concept, the Romanian political community qualifies without doubts. However, if we consider the "thick" version of the term's prevailing significance, the entirety of the Romanian citizens, which includes the members of the Hungarian minority, falls short of the criteria of the ideal political community for several reasons

Exploración del fenómeno de tráfico de vehículos con la calculadora

En este trabajo se presenta la implementación en una calculadora graficadora y programable de un modelo actual para simular el tráfico de vehículos y algunas ideas acerca de como utilizar esta implementación para explorar dicho fenómeno con diferentes representaciones, en un contexto de solución de problemas

La evolución de la tecnología computacional y su relación con la matemática

En este trabajo haré una revisión de la evolución de la tecnología computacional y su relación con la educación matemática. Además, voy a presentar diferentes tipos de tecnología digital, sus posibilidades en la educación y cómo se utilizan. Por último, voy a presentar información sobre el número de ordenadores que existen y la forma en que se utilizan en la educación matemática en Mexico. Esto es, con el propósito de que los profesores de matemática puedan tener una perspectiva amplia para utilizar la tecnología computacional