Informalidade no mercado de trabalho : o caso do Brasil e da China

O emprego informal representa uma parte relevante do mercado de trabalho e da economia. De um lado, ele desempenha um papel importante na produção, criação de emprego e geração de renda; de outro, a informalidade do mercado de trabalho coloca os trabalhadores em situações de vulnerabilidade a maiores riscos, impactando de forma desfavorável sobre a adequação dos rendimentos, a segurança e a saúde ocupacional e as condições de trabalho em geral. Para entender o mercado de trabalho de forma completa, é necessário entender o setor informal, pois ele fornece informações valiosas sobre a qualidade do emprego que são cruciais para a compreensão abrangente do mercado de trabalho e do bem-estar social. Brasil e China, dois países tão distintos, com diferentes panoramas históricos, mas que passaram pelo mesmo efeito que levou ao aumento da informalidade.Informal employment represents a relevant part of the labor market and the economy. On the one hand, it plays an important role in production, employment creation and income generation, on the other, the informality of the labor market puts workers in situations of vulnerability, having an unfavorable impact on the income adequacy, occupational safety and working conditions. To fully understand the labor market, it is necessary to understand the informal sector, as it provides valuable information on the quality of employment and is crucial for understanding the labor market and social well being. Brazil and China, two countries so distinct, with different historical overviews, but which had the same effect that led to an increase in informality

Integrable Open Spin Chains from Flavored ABJM Theory

We compute the two-loop anomalous dimension matrix in the scalar sector of planar ${\cal N}=3$ flavored ABJM theory. Using coordinate Bethe ansatz, we obtain the reflection matrix and confirm that the boundary Yang-Baxter equations are satisfied. This establishes the integrability of this theory in the scalar sector at the two-loop order.Comment: v2, 25 pages, 2 figures, minor corrections, references adde

Agency problems in firms with an even number of directors: evidence from China

To avoid a tie in voting, most boards have an odd number of directors. We argue that boards with an even number of directors are more likely to be weak monitors because of inefficient decision making and being captured by controlling shareholders. Consistent with this argument, we find that in China boards with an even number of directors have fewer meetings and are more likely to have board members absent from board meetings. Firms with an even number of directors have more tunnelling through intercorporate loans and related party transactions, lower financial reporting quality and higher incidence of accounting irregularities. This evidence is stronger in firms with weaker external monitoring and for directors with weaker incentives to monitor. Finally, we show that firms with an even number of directors are associated with lower market valuation of equity. Our results suggest that corporate boards with an even number of directors in emerging markets are associated with more agency problems

Rice bacterial blight pathogen Xanthomonas oryzae pv. oryzae produces multiple DSF-family signals in regulation of virulence factor production

<p>Abstract</p> <p>Background</p> <p><it>Xanthomonas </it><it>oryzae </it>pv. <it>oryzae </it>(<it>Xoo</it>) is the causal agent of rice bacterial blight disease. <it>Xoo </it>produces a range of virulence factors, including EPS, extracellular enzyme, iron-chelating siderophores, and type III-secretion dependent effectors, which are collectively essential for virulence. Genetic and genomics evidence suggest that <it>Xoo </it>might use the diffusible signal factor (DSF) type quorum sensing (QS) system to regulate the virulence factor production. However, little is known about the chemical structure of the DSF-like signal(s) produced by <it>Xoo </it>and the factors influencing the signal production.</p> <p>Results</p> <p><it>Xoo </it>genome harbours an <it>rpf </it>cluster comprising <it>rpfB</it>, <it>rpfF</it>, <it>rpfC </it>and <it>rpfG</it>. The proteins encoded by these genes are highly homologous to their counterparts in <it>X. campestris </it>pv. <it>campestris </it>(<it>Xcc</it>), suggesting that <it>Xcc </it>and <it>Xoo </it>might use similar mechanisms for DSF biosynthesis and autoregulation. Consistent with <it>in silico </it>analysis, the <it>rpfF </it>mutant was DSF-deficient and the <it>rpfC </it>mutant produced about 25 times higher DSF-like activity than the wild type <it>Xoo </it>strain KACC10331. From the supernatants of <it>rpfC </it>mutant, we purified three compounds showing strong DSF-like activity. Mass spectrometry and NMR analysis revealed that two of them were the previously characterized DSF and BDSF; the third one was a novel unsaturated fatty acid with 2 double bonds and was designated as CDSF in this study. Further analysis showed that all the three DSF-family signals were synthesized via the enzyme RpfF encoded by <it>Xoo2868</it>. DSF and BDSF at a final concentration of 3 μM to the <it>rpfF </it>mutant could fully restore its extracellular xylanase activity and EPS production to the wild type level, but CDSF was less active than DSF and BDSF in induction of EPS and xylanase. DSF and CDSF shared a similar cell density-dependent production time course with the maximum production being detected at 42 h after inoculation, whereas the maximum production of BDSF was observed at 36 h after inoculation. When grown in a rich medium such as YEB, LB, PSA, and NYG, <it>Xoo </it>produced all the three signals with the majority being DSF. Whereas in nutritionally poor XOLN medium <it>Xoo </it>only produced BDSF and DSF but the majority was BDSF.</p> <p>Conclusions</p> <p>This study demonstrates that <it>Xoo </it>and <it>Xcc </it>share the conserved mechanisms for DSF biosynthesis and autoregulation. <it>Xoo </it>produces DSF, BDSF and CDSF signals in rich media and CDSF is a novel signal in DSF-family with two double bonds. All the three DSF-family signals promote EPS production and xylanase activity in <it>Xoo</it>, but CDSF is less active than its analogues DSF and BDSF. The composition and ratio of the three DSF-family signals produced by <it>Xoo </it>are influenced by the composition of culture media.</p