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- Refining the morphological characteristics of Dipolydora capensis(Day, 1955) and Dipolydora goreensis (Augener, 1918)(Annelida: Polychaeta: Spionidae) from Atlantic African watersPublication . Radashevsky, Vasily I; Martin, Daniel; Gil, JoãoTogether with Syllidae, Nereididae and Eunicidae, Spionidae is one of the four more speciose families of polychaete annelids in southern Africa, comprising 25% of the known species and 53–85% of the unresolved cosmopolitans. Among southern African spionids, the genus Dipolydora Verrill, 1881 particularly requires further revision and, in this paper, we contribute by refining the morphological characteristics of D. capensis (Day, 1955) and D. goreensis (Augener, 1918). Neither species has been redescribed since their original description and are currently difficult to distinguish and identify. Therefore, our study provides additional morphological details based on examining type specimens and newly collected materials from South Africa and the Republic of Congo.
- The role of family in the life satisfaction of young adults: an ecological-systemic perspectivePublication . Almeida, Paula Morales; Brás, Marta; Nunes, Cristina; Martins, CátiaThe support provided by parents plays a relevant role in the life satisfaction (LS) of young people, as well as in their level of psychological distress (PD), which are among the important mediators of their well-being. Family structure has also been identified as a protective or risk factor. Hence, the present study provides a more complex analysis of young people’s LS, considering the type of family cohabitation (based on parental presence), the personal conditions of the young people (PS), and their perception of the context (social support; SP). A cross-sectional design was used, and 557 young people, with a mean age of 20.68 (SD = 2.23), 50.8% women, 60.7% students, participated. Their levels of psychological distress, perceived social support, life satisfaction, and parental cohabitation were assessed. A mediation and a moderated-mediation model were used. Young people living in a biparental family reveal higher levels of LS and lower levels of PS. A partial mediation was found in the effect of SP on the relation between PS and LS. The moderated-mediation model tested showed that the indirect effects on the paths PS–SP and SP–LS were not significant by the type of parental family cohabitation. Several implications regarding family structure on young people’s LS are discussed.
- Refining the morphological characteristics of dipolydora capensis (Day, 1955) and dipolydora goreensis (Augener, 1918) (annelida: polychaeta: spionidae) from atlantic African watersPublication . Radashevsky, Vasily I; Martin, Daniel; Gil, JoãoTogether with Syllidae, Nereididae and Eunicidae, Spionidae is one of the four more speciose families of polychaete annelids in southern Africa, comprising 25% of the known species and 53-85% of the unresolved cosmopolitans. Among southern African spionids, the genus Dipolydora Verrill, 1881 particularly requires further revision and, in this paper, we contribute by refining the morphological characteristics of D. capensis (Day, 1955) and D. goreensis (Augener, 1918). Neither species has been redescribed since their original description and are currently difficult to distinguish and identify. Therefore, our study provides additional morphological details based on examining type specimens and newly collected materials from South Africa and the Republic of Congo.
- Study of the Physiological, Molecular and Biochemical Mechanisms in Populus alba L. "Villafranca" clone under salinity stressPublication . Pereira, Samanta de Oliveira; Romano, Anabela; Sebastiani, LucaThe present work aimed to characterize the morphological, physiological, biochemical, and molecular responses of the Populus alba L. "Villafranca" clone to salt stress. To analyze the effects of salt stress, plants were treated for one month with different concentrations of sodium chloride (NaCl): 0 mM (control), 60 mM, 120 mM, and 180 mM NaCl. Morphologically, no significant changes were observed in plant length. However, a decrease in the fresh weight of all organs was noted as salinity levels increased. Symptoms of chlorosis were observed in groups treated with 120 mM and 180 mM NaCl. Physiologically, decreases were observed in all analyzed parameters across all groups, with the 180 mM NaCl group being the most affected. Stomatal conductance (Gs) and net photosynthetic rate (Pn) in the 180 mM NaCl group decreased by 81.4 % and 69.2 %, respectively. Chlorophyll and flavonol content decreased by 40.4 % and 29.4 %, respectively, in the 180 mM NaCl group. Biochemically, proline concentration and mineral element absorption in leaves and roots were quantified. The highest proline concentration was in the 120 mM NaCl treatment (43.2 ± 9.36 mg/g FW), while the 180 mM group had the lowest content (14.5 ± 7.47 mg/g FW). In basal leaves, the group treated with 60 mM NaCl showed the highest proline concentration (8.8 ± 0.68 mg/g FW). Sodium concentration increased in all organs, with the highest concentration in the 180 mM group. The potassium concentration was changed only in roots, where there was a decrease in the 120 and 180 mM groups. Unlike calcium, where there were changes only in the leaves and not in the roots. There was an increase in calcium concentration as salt stress increased, reaching its peak in the 180 mM NaCl group. At the molecular level, the expression of three genes from the glutathione pathway was analyzed: GSTF1, GPX1, and GSH1. Only GSTF1 expression changed under salt stress, increasing by 162.5 % in basal leaves and 179.6 % in roots. GPX1 did not change during stress but was more abundant in leaves. GSH1 was present in similar concentrations in both organs.