Megasatellites: a peculiar class of giant minisatellites in genes involved in cell adhesion and pathogenicity in Candida glabrata

Minisatellites are DNA tandem repeats that are found in all sequenced genomes. In the yeast Saccharomyces cerevisiae, they are frequently encountered in genes encoding cell wall proteins. Minisatellites present in the completely sequenced genome of the pathogenic yeast Candida glabrata were similarly analyzed, and two new types of minisatellites were discovered: minisatellites that are composed of two different intermingled repeats (called compound minisatellites), and minisatellites containing unusually long repeated motifs (126–429 bp). These long repeat minisatellites may reach unusual length for such elements (up to 10 kb). Due to these peculiar properties, they have been named ‘megasatellites’. They are found essentially in genes involved in cell–cell adhesion, and could therefore be involved in the ability of this opportunistic pathogen to colonize the human host. In addition to megasatellites, found in large paralogous gene families, there are 93 minisatellites with simple shorter motifs, comparable to those found in S. cerevisiae. Most of the time, these minisatellites are not conserved between C. glabrata and S. cerevisiae, although their host genes are well conserved, raising the question of an active mechanism creating minisatellites de novo in hemiascomycetes

Reconciling the Returns to Rural Education

Previous studies have found that the returns to education in rural China are far lower than\r\nestimates for market economies. In this paper, we try to determine why previous estimates are\r\nso low. Whereas estimates for the early 1990s average 2.3 percent, we find an average return\r\nof 6.4 percent. Furthermore, we find even higher returns among younger people, migrants,\r\nand for post-primary education. We further show that although part of the difference between\r\nour estimate and previous estimates can be attributed to increasing returns over time, a larger\r\nportion of the difference is due to the methodology used by other authors.

Labor Market Emergence and Returns to Education in Rural China

This paper examines the emergence of labour markets in China through the lens of returns to rural education. It demonstrates that methodology plays an important role in explaining the low estimates of returns in previous studies. When wages are defined on an hourly basis and sample selectivity is controlled, estimated rates of return rise. In addition, using data on households (n=1199) followed over 15 years (1988-2002), the paper shows that returns have risen over time. Finally, using households from the same community, it is shown that the returns rise even more when the sample includes workers with demographic and employment profiles more like those in the rest of the world (i.e., young and working in urban areas). In fact, the paper finds that the returns to education are close to 10% for young wage earners. When looked at in total, the results show that the returns to rural education in China are completely consistent with other developing countries. Finally, these results indicate that China's labour markets are becoming more functional over time.

The Evolution of China's Rural Labor Markets during the Reforms

This paper contributes to the assessment of China's rural labor markets, while paying attention to whether these markets are developing in a manner conducive to the nation's modernization. According to our household survey, we find that the rapid increase in off-farm activity; has become dominated by young and better educated workers; expanded most rapidly in areas that are relatively well-off; and begun to draw workers from portions of the population, such as women, that earlier had been excluded from participation

Moving off the farm and intensifying agricultural production in Shandong: a case study of rural labor market linkages in China

This study examines linkages between off-farm labor markets and the labor allocated by farmers to on-farm production of fruit crops. Using a stratified random sample of rural households in Shandong Province, we find that young and educated members of the labor force tend to work more frequently in the off-farm labor market, and that off-farm employment reduces the likelihood and intensity of fruit production. Fruit production is associated with lower levels of off-farm employment. Households and individuals who are less likely (or able) to find off-farm employment can benefit from shifting into fruit production. Although off-farm employment is an important avenue out of poverty, fruit production provides ways for the less educated and older households to raise their income. Copyright (c) 2009 International Association of Agricultural Economists.

Farmer Participation, Processing, and the Rise of Dairy Production in Greater Beijing, P. R. China

"With rapid income growth, dairy production and consumption in China have increased significantly. The emergence of the dairy sector provides opportunities for farmers to participate in a high-value, potentially more lucrative enterprise. The overall goal of this paper is to analyze the major determinants of farmer participation in dairy production. Our main questions include whether or not the pace of the emergence of the dairy processing industry has affected the ability of farmers (especially small and relatively poor ones) to participate in dairy production; and whether or not it has limited the expansion of their herd size. Based on household, village, and processor surveys conducted in the Greater Beijing region, our analysis indicates that the location of dairy processing firms is one key factor that determines the participation of farmers in dairy production. Although other factors affect participation and herd size, including road access and the ability to find employment off the farm (which affects the opportunity cost of household members), the proximity to a dairy processor is shown to be one of the major factors that has encouraged the growth of dairy production for a given farmer in a specific region during the past decade. The results also show that poor, less educated farmers with relatively less access to land are not excluded from the expansion of the Greater Beijing dairy market." Copyright (c) 2010 Canadian Agricultural Economics Society.