Les Algues Indicatrices De L'eutrophisation Et De La Contamination De La Lagune De Korba (Cap Bon Tunisie)

The concentrations of heavy metals (Fe, Zn, Pb and Mn) were determined in two green algae (Enteromorpha intestinalis and Chaetomorpha Linium) collected from April 2012 to February 2013 in nine stations characterized by the abundance of these algae throughout the year. Determination of Pb, Mn and Zn was carried out by graphite furnace atomic absorption spectrometer while Fe by flame atomic absorption spectrometer (using the Thermo Scientific ICE 3300 AA Spectrometer). An evaluation of the degree of eutrophication is made through the physicochemical study of 31 samples in the surface water. The results underline that Korba is an eutrophic lagoon. The heavy metal concentrations in the water samples decreased in the sequence of Fe >Zn > Mn > Pb, while in Chaetomorpha Linium, Enteromorpha intestinalis and sediment exhibited the same pattern across the sites: Fe >Mn> Zn >Pb. The results show that metal accumulation capacity in both macro-algae varies according to the season and depends on the species. By comparison with other studies in the world, the levels found in the algae of Korba lagoon are relatively high except Mn. Chaetomorpha Linium could be used as an excellent indicator for heavy metals accumulation in Korba lagoon

Research of the origin of a particular Tunisian group using a physical marker and Alu insertion polymorphisms

The aim of this study was to show how, in some particular circumstances, a physical marker can be used along with molecular markers in the research of an ancient people movement. A set of five Alu insertions was analysed in 42 subjects from a particular Tunisian group (El Hamma) that has, unlike most of the Tunisian population, a very dark skin, similar to that of sub-Saharans, and in 114 Tunisian subjects (Gabes sample) from the same governorate, but outside the group. Our results showed that the El Hamma group is genetically midway between sub-Saharan populations and North Africans, whereas the Gabes sample is clustered among North Africans. In addition, The A25 Alu insertion, considered characteristic to sub-Saharan Africans, was present in the El Hamma group at a relatively high frequency. This frequency was similar to that found in sub-Saharans from Nigeria, but significantly different from those found in the Gabes sample and in other North African populations. Our molecular results, consistent with the skin color status, suggest a sub-Saharan origin of this particular Tunisian group

Impact of the antidepressant Bupropion on the Dynamic Energy Budget of Daphnia magna

In this work, we applied the Dynamic Energy Budget theory to investigate the possible physiological mode of action of the antidepressant Bupropion on the model organism Daphnia magna. Dynamic Energy Budget Individual-Based Models (DEB-IBM) were also used to extrapolate the results to the population level and to predict the combined effects of Bupropion exposure and food availability on the daphnids. Life-history traits (survival, growth, reproduction) of the individual animals were monitored until the end of the experiment (21 days). Survival and the number of live offspring produced per live female were recorded daily, while body length was measured every other day. Our results revealed an increasing negative effect of this antidepressant on the reproduction and survival of the animals with increasing concentration. At the population level, we found that even environmentally relevant doses of Bupropion could reduce the population density and its reproductive output. The impacts are predicted to be stronger under limited food conditions

Impact of the antidepressant Bupropion on the Dynamic Energy Budget of Daphnia magna

In this work, we applied the Dynamic Energy Budget theory to investigate the possible physiological mode of action of the antidepressant Bupropion on the model organism Daphnia magna. Dynamic Energy Budget Individual-Based Models (DEB-IBM) were also used to extrapolate the results to the population level and to predict the combined effects of Bupropion exposure and food availability on the daphnids. Life-history traits (survival, growth, reproduction) of the individual animals were monitored until the end of the experiment (21 days). Survival and the number of live offspring produced per live female were recorded daily, while body length was measured every other day. Our results revealed an increasing negative effect of this antidepressant on the reproduction and survival of the animals with increasing concentration. At the population level, we found that even environmentally relevant doses of Bupropion could reduce the population density and its reproductive output. The impacts are predicted to be stronger under limited food conditions.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Genetic differentiation of Yemeni people according to rhesus and Gm polymorphisms

For introducing Yemeni population in synthesis of genetic relationships of human populations, analysis of rhesus and Gm polymorphisms have been carried out for a population sample of 210 Yemenites. Rhesus haplotype frequencies were compared to those estimated in an original sample of 171 Tunisians and to available data for other populations. Gm haplotype frequencies were introduced in a wide synthesis of genetic relationships for 67 populations from Africa, Europe, the Near East and India. The genetic profile of Yemeni people would be close to that of a highly diversified ancestral population. The first inhabitants of North Africa, the Berbers and Yemenites have very likely a common origin and were not subject to important genetic drift after their geographic differentiation. While, the divergence between Yemenites and their neighbours of sub-Saharan Africa would have occurred with a founder effect and a long isolation. An important parallelism is observed for the Gm system between genetic and linguistic differentiations