Collagen in the scarless fetal skin wound : detection with picrosirius-polarization

Our group has developed an ovine model of deep dermal, partial-thickness burn where the fetus heals scarlessly and the lamb heals with scar. The comparison of collagen structure between these two different mechanisms of healing may elucidate the process of scarless wound healing. Picrosirius staining followed by polarized light microscopy was used to visualize collagen fibers, with digital capture and analysis. Collagen deposition increased with fetal age and the fibers became thicker, changing from green (type III collagen) to yellow/red (type I collagen). The ratio of type III collagen to type I was high in the fetus (166), whereas the lamb had a much lower ratio (0.2). After burn, the ratios of type III to type I collagen did not differ from those in control skin for either fetus or lamb. The fetal tissue maintained normal tissue architecture after burn while the lamb tissue showed irregular collagen organization. In conclusion, the type or amount of collagen does not alter significantly after injury. Tissue architecture differed between fetal and lamb tissue, suggesting that scar development is related to collagen cross-linking or arrangement. This study indicates that healing in the scarless fetal wound is representative of the normal fetal growth pattern, rather than a "response" to burn injury.

La escolarizaci??n de los hijos e hijas de inmigrantes y de minor??as ??tnico-culturales

Resumen tomado del autor. Este art??culo se incluye en el monogr??fico ??Reflexiones sobre pol??tica educativa??

Fecundity of the mangrove crab Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae)

Females of the mangrove crab Ucides cordatus were collected in a monthly basis along a 2-year period at the mangrove areas of Iguape, SP, Brazil. Ovigerous individuals were measured (CW, carapace width) and weighed (WW, wet weight). Each brood was weighed (WWE, wet weight of eggs), dried (DWE, dry weight of eggs) and the number of eggs (EN) was recorded. Scatter plots for the relationships EN/CW, EN/WW and EN/WWE were produced, and the data were subjected to regression analysis. Relative average fecundity (F 1) was calculated in different seasons and compared to verify if there were any temporal variation of reproductive intensity. Fecundity in U. cordatus varied from 36.081 to 250.566 eggs according to the size-dependent relationship EN = 15.27CW 2.24 (N = 66; R 2 = 0.69; p<0.001). The other expressions obtained for the relationships were: EN = 3797.6WW 0.813 (N = 56; R 2 = 0.72; p<0.001); EN = 29226WWE 0.775 (N = 54; R 2 = 0.70; p<0.001); and EN = 1093586DWE 0.769 (N = 66; R 2 = 0.86; p<0.001). Ovigerous females were found only during spring and summer, and relative average fecundity differed between these seasons. Relative average fecundity was higher in spring and relative frequency of ovigerous females was higher during summer. Overall reproductive intensity was similar between these seasons. The observed trends are regarded to be related to temperature and photoperiod variations.

The Weakness of Post-Communist Civil Society Reassessed. CES Papers - Open Forum #11, 2012

During the last two decades, scholars from a variety of disciplines have argued that civil society is structurally deficient in post-communist countries. Yet why have the seemingly strong, active and mobilized civic movements of the transition period become so weak after democracy was established? And why have there been diverging political trajectories across the post-communist space if civil society structures were universally weak? This paper uses a wide range of data from various available sources to show that civil societies in Central and Eastern European countries are not as feeble as is commonly assumed. Some post-communist countries possess vigorous public spheres, and active civil society organizations strongly connected to transnational civic networks able to shape domestic policies. Following the calls by Anheier (2004) and Bernhard and Karakoç (2007) we adopt a multidimensional approach to the measurement of civil society. In a series of cross-section timeseries models, we show that our broader measures of civic and social institutions are able to predict the diverging transition paths among post-communist regimes, and in particular the growing gap between democratic East Central Europe and the increasingly authoritarian post-Soviet space.