Tissue localization and the physiological effects induced by an environmentally relevant mix of heavy metals in the liverwort Conocephalum conicum L. Dum

Tissue accumulation, ultrastructural alterations, oxidative stress, and effects on photosynthesis were assessed in the liverwort Conocephalum conicom exposed in vitro to heavy metals (HM) concentrations in three sites of the Savone River, representative of different anthropic impacts. The uptake and accumulation of HM in the thallus of the liverwort was first studied, and the biological effects in relation to the different accumulation sites of HM along thallus, ribs and wings, were then investigated, considering: bioaccumulation (by atomic absorption spectrometry), localization (by X-ray scanning electron microscopy microanalysis), ultrastructural damage of photosynthetic parenchyma (by transmission electron microscopy), oxidative stress (by ROS contents and antioxidant enzymes activities determination), photosynthesis (by chlorophyll fluorescence). The results showed the HM bioaccumulation in C. conicom was dependent by their concentrations in the contaminated water. As for spatial localization, HM preferentially accumulated in the nerve of gametophytes respect to the wings. With respect to tissue localization, HM were mainly found in the hyaline and in the photosynthetic parenchyma. Essential metals (Cu and Zn) were accumulated at higher concentrations with respect to non-essential metals (Pb and Cd). At the ultrastructural level, HM caused alterations of the fine structure of the cells, most evident along the nerve, inducing marked alterations of the chloroplast structure and therefore of the photosynthetic capacity. Based on the results of the presented study, C.conicum can be used as a marker to indicate heavy metal pollution in water natural resources

Antioxidant response to heavy metal pollution of regi lagni freshwater in Conocephalum conicum L. (Dum.)

Conocephalum conicum L. is a cosmopolitan liverwort species able to respond to local environmental pollution by changing its biological features. In the present study, we assessed the different biological responses in C. conicum to heavy metal contamination of Regi Lagni channels, a highly polluted freshwater body. As for the in field experiment, we set up moss bags containing collected samples of the local wild growing C. conicum, from the upstream site (non-polluted area), and we exposed them in the three selected sites characterized by different and extreme conditions of heavy metal pollution. In addition, to better understand the contribution of heavy metals to the alterations and response of the liverwort, we performed in vitro tests, using the same concentration of heavy metals measured in the sites at the moment of the exposition. In both experimental settings, bioaccumulation, ultrastructural damage, reactive oxygen species production and localization, antioxidant enzymes activity (superoxide dismutase, catalase and glutathione S-transferases), glutathione (reduced and oxidized) levels, localization of compounds presenting thiol groups and phenolic content were investigated. The results showed that the samples from different sites and conditions (for in vitro tests) showed significant differences. In particular, the ultrastructural alterations show a trend correlated to the different exposure situations; ROS contents, glutathione, antioxidant enzyme activities, and phenolic contents were increased showing an enhancement of the antioxidant defense both by the enzymatic way and by using the synthesis of antioxidant phenolic compounds. This study confirms the ability of C. conicum to respond to heavy metal pollution and the responses studied are, at least partially, correlated to the presence of heavy metals. All the responses considered respond consistently with the pollution trend and they can be proposed as pollution biomarkers. Therefore, we suggest the use of C. conicum to identify local hot spots of pollution in further investigation

The symbIoTe Solution for Semantic and Syntactic Interoperability of Cloud-based IoT Platforms

The current IoT landscape is dominated by cloud-based platforms offering non-standardized interfaces to access virtualized IoT resources and adopting proprietary information models. The implementation of cross-platform and cross-domain IoT applications becomes cumbersome and usually leads to custom solutions, tailored to the involved platforms, due to the semantic and syntactic incompatibilities. The symbIoTe approach offers mediation services for search and controlled access to IoT resources (sensors, actuators, and related services) across platforms in a uniform way. It provides an IoT Portal with registration and search capabilities using semantic web technologies for semantic interoperability, and an abstraction layer for unified and secure access to those resources across distributed IoT platform instances for syntactic interoperability. In this paper, we present the general concepts and design decisions built into the symbIoTe open source middleware and showcase the evolving symbIoTe ecosystem which facilitates the rapid development of innovative cross-platform IoT applications. The open IoT Portal currently integrates 15 IoT platforms and data sources for Smart City and Smart Residence domains, and hosts metadata registering more than 4,000 various IoT resources

Fears, beliefs, and quality of life of patients with cancer vs the general population during the coronavirus disease 2019 (COVID-19) pandemic in Lombardy

Aim: To understand how patients with cancer reacted to the coronavirus disease 2019 (COVID-19) pandemic and whether their quality of life (QoL) was affected. Methods: In June 2020, 111 patients with cancer treated in the supportive care unit of a Comprehensive Cancer Center in Milan and 201 healthy controls from the general population were enrolled and assessed both quantitatively and qualitatively for fears and COVID-19–related beliefs as well as for QoL. Results: Fear of COVID-19 was significantly lower among patients (41% vs 57.6%; p = 0.007), as was fear of cancer (61.5% vs 85.6%; p < 0.001) and other diseases. The perceived risk of getting COVID-19 was lower among patients (25.2% vs 52.7%; p < 0.001), as was the belief of having been exposed to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (18.1% vs 40.8%; p < 0.001). The physical component of QoL was better among the population (54.5 vs 43.8; p < 0.001); the reverse was true for patients’ psychological well-being (44.6 vs 39.6; p < 0.001). The qualitative data supported such results, showing a reduced psychological effect on the patients with cancer compared to the controls. Various reasons explain this result, including the awareness of being treated for cancer and nevertheless protected against getting infected in a cancer center of public health reorganized to continue treating patients by protecting them and personnel from the risk of infection. Conclusions: The experience of a cancer diagnosis, together with proper hospital reorganization, may act as protective factors from fears and psychological consequences of the COVID-19 outbreak