Freestanding non-covalent thin films of the propeller-shaped polycyclic aromatic hydrocarbon decacyclene

Molecularly thin, nanoporous thin films are of paramount importance in material sciences. Their use in a wide range of applications requires control over their chemical functionalities, which is difficult to achieve using current production methods. Here, the small polycyclic aromatic hydrocarbon decacyclene is used to form molecular thin films, without requiring covalent crosslinking of any kind. The 2.5 nm thin films are mechanically stable, able to be free-standing over micrometer distances, held together solely by supramolecular interactions. Using a combination of computational chemistry and microscopic imaging techniques, thin films are studied on both a molecular and microscopic scale. Their mechanical strength is quantified using AFM nanoindentation, showing their capability of withstanding a point load of 26 ± 9 nN, when freely spanning over a 1 μm aperture, with a corresponding Young’s modulus of 6 ± 4 GPa. Our thin films constitute free-standing, non-covalent thin films based on a small PAH

COVID-19 atypical Parsonage-Turner syndrome: a case report

Background Neurological manifestations of Sars-CoV-2 infection have been described since March 2020 and include both central and peripheral nervous system manifestations. Neurological symptoms, such as headache or persistent loss of smell and taste, have also been documented in COVID-19 long-haulers. Moreover, long lasting fatigue, mild cognitive impairment and sleep disorders appear to be frequent long term neurological manifestations after hospitalization due to COVID-19. Less is known in relation to peripheral nerve injury related to Sars-CoV-2 infection. Case presentation We report the case of a 47-year-old female presenting with a unilateral chest pain radiating to the left arm lasting for more than two months after recovery from Sars-CoV-2 infection. After referral to our post-acute outpatient service for COVID-19 long haulers, she was diagnosed with a unilateral, atypical, pure sensory brachial plexus neuritis potentially related to COVID-19, which occurred during the acute phase of a mild Sars-CoV-2 infection and persisted for months after resolution of the infection. Conclusions We presented a case of atypical Parsonage-Turner syndrome potentially triggered by Sars-CoV-2 infection, with symptoms and repercussion lasting after viral clearance. A direct involvement of the virus remains uncertain, and the physiopathology is unclear. The treatment of COVID-19 and its long-term consequences represents a relatively new challenge for clinicians and health care providers. A multidisciplinary approach to following-up COVID-19 survivors is strongly advised

The James Webb Space Telescope Mission

Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least $4m$. With the support of their governments in the US, Europe, and Canada, 20,000 people realized that vision as the $6.5m$ James Webb Space Telescope. A generation of astronomers will celebrate their accomplishments for the life of the mission, potentially as long as 20 years, and beyond. This report and the scientific discoveries that follow are extended thank-you notes to the 20,000 team members. The telescope is working perfectly, with much better image quality than expected. In this and accompanying papers, we give a brief history, describe the observatory, outline its objectives and current observing program, and discuss the inventions and people who made it possible. We cite detailed reports on the design and the measured performance on orbit.Comment: Accepted by PASP for the special issue on The James Webb Space Telescope Overview, 29 pages, 4 figure

Studio computazionale dei meccanismi di fotoprotezione nei fotosistemi delle piante

Lavoro di ricerca concentrato sui processi fotoprotettivi nei complessi antenna di piante ed alghe, in particolare sul Light Harvesting Complex II (LHCII) e sul meccanismo di Charge-Transfer nell'ambito del Non-Photochemical Quenching (NPQ). L'analisi computazionale studia il meccanismo di Charge-Transfer intermolecolare in dimeri clorofilla-clorofilla e clorofilla-carotenoide, e la sua competitività con altri processi di quenching molecolare

Design and Impact of a Teacher Training Course, and Attitude Change Concerning Educational Robotics

Current initiatives and laboratories concerning Educational Robotics (ER) are often not based on strong pedagogical backgrounds. Additionally, they are carried out by inadequately trained teachers, and are not evaluated properly in terms of effectiveness. Moreover, according to teachers, ER usability is often neglected. The main goal of the present article is to present a training course on ER (Edu.Ro.Co.), grounded in pedagogical insights, and to discuss the results of the course and teacher’s opinion about ER in terms of: (i) teachers’ attitudes and perceptions of using ER; (ii) the potential impact of ER on students’ key competences for lifelong learning; and (iii) strengths and weaknesses of ER. These aspects were analysed by means of questionnaires specifically designed by the authors, and administered before and after the training course. A total of 339 teachers attended the training course and 254 completed the questionnaires. The article describes the methodology utilised in the realisation of the course and analyses the questionnaire’s results. In particular, the number of teachers that considered themselves prepared to apply ER significantly improved after the training course. ER is considered by teachers an important tool for the improvement of students’ motivation, planning skills, team working, problem solving and creativity development. Finally, the results from questionnaires indicate that teachers consider ER, a method that improves team-working abilities and motivation in the students. In contrast, the main disadvantage is the cost of the robotic kits. Based on these results, new directions for future research in ER are discussed