Levantamento de rizóbios em adubos verdes cultivados em sistema integrado de produção agroecológica (SIPA).

Adubos verdes e coleta de nódulos. Isolamento e caracterização de bactérias.bitstream/item/81689/1/doc204.pd

Higher education outcomes, graduate employment and university performance indicators

Official employment-related Performance Indicators in UK Higher Education are based on the population of students responding to the First Destination Supplement (FDS). This generates potentially biased performance indicators as this population of students is not necessarily representative of the full population of leavers from each institution. University leavers not obtaining qualifications and those not responding to the FDS are not included within the official analysis. We compare an employment-related performance indicator based on those students responding to the FDS with alternative approaches which address the potential non-random nature of this sub-group of university leavers

The Willingness to Pay for Job Amenities: Evidence from Mothers' Return to Work

This study is the first to estimate mother's marginal willingness to pay (MWP) for job amenities directly. Its identification strategy relies on German maternity leave length. The key aspect of the maternal leave framework is that mothers can decide whether and when to return to their guaranteed job. Thus, in contrast to previous studies that analyze the job search of employed workers, this framework allows us to overcome the limitation of not observing the wage/amenity offer process. A theoretical model of the leave length decision is derived from a random utility approach. Using data from the German Socio-Economic Panel and the Qualification and Career Survey, this model is estimated by a discrete duration method. The MWP for amenities can be inferred through the estimated elasticities of the leave length with respect to the amenities and the wage. The results provide evidence that mothers are willing to sacrifice a significant fraction of their wage to reduce hazards (22%) and to enjoy a flexible working schedule (36-56%)

The Structure of Ethnic Networks and Exports: Evidence from Germany

This paper provides evidence of the effect of immigration-based networks on German trade. Germany presents a particular interesting case study to examine the effect of ethnic networks on exports due to its high export dependence and its reserved migration policy. According to our results, we find no trade creating effect from migrant networks on exports but on imports, highlighting the importance of the demand effect for Germany. Allowing for heterogeneous network effects shows that at least some migrant networks positively affect exports. However, the most efficient migrant networks do not originate from EU countries but from African or middle-eastern countries that do not have a large migrant network in Germany