The impact of the second COVID-19 lockdown on anxiety and depressive symptoms in pregnant women: A case study of pregnant women in northern Italy.

Background: the different lockdown phases due to COVID-19 may have negatively impacted pregnant women's mental health. Concerning antenatal stress, most studies focused more on the effect of pandemic onset than on the impact of the following phases and restrictions. Aim: the present study aimed to assess levels of anxiety and depression in a group of Italian pregnant women during the second COVID-19 phase and possible risk factors. Method: We recruited 156 pregnant women through our Perinatal Psychology Outpatient Clinic. We divided the sample into women recruited before the pandemic (N = 88) through a face-to-face antenatal class and pregnant women recruited during the second lockdown (Covid-19 study group) (November 2020-April 2021) through the same antenatal class via Skype (N = 68). To investigate depressive and anxiety symptoms, we administered the Edinburgh Postnatal Depression Scale (EPDS) and the State and Trait Anxiety Inventory (STAI-Y) scales; women's medical history and obstetric data were collected. Findings: women belonging to the Covid-19 study group reported higher depressive and anxious levels than the pre-pandemic group. Moreover, during the second lockdown previous psychopathology and being close to childbirth were related to increased depression; a history of abortion was related to higher levels of trait anxiety instead. Conclusion: recurrent restrictive measures due to COVID-19 negatively affected the antenatal mental well-being of pregnant women, particularly worsening depressive and anxious feelings. Pregnant women during the pandemic represented a vulnerable population to be monitored more closely and timely to prevent psychological problems in the postpartum period and their consequences on the child. Keywords: anxiety, depression, pregnancy, COVID-19, mental health, lockdown.

Design of Pyrrole-Based Gate-Controlled Molecular Junctions Optimized for Single-Molecule Aflatoxin B1 Detection.

Food contamination by aflatoxins is an urgent global issue due to its high level of toxicity and the difficulties in limiting the diffusion. Unfortunately, current detection techniques, which mainly use biosensing, prevent the pervasive monitoring of aflatoxins throughout the agri-food chain. In this work, we investigate, through ab initio atomistic calculations, a pyrrole-based Molecular Field Effect Transistor (MolFET) as a single-molecule sensor for the amperometric detection of aflatoxins. In particular, we theoretically explain the gate-tuned current modulation from a chemical-physical perspective, and we support our insights through simulations. In addition, this work demonstrates that, for the case under consideration, the use of a suitable gate voltage permits a considerable enhancement in the sensor performance. The gating effect raises the current modulation due to aflatoxin from 100% to more than 103÷104%. In particular, the current is diminished by two orders of magnitude from the µA range to the nA range due to the presence of aflatoxin B1. Our work motivates future research efforts in miniaturized FET electrical detection for future pervasive electrical measurement of aflatoxins.

Socio-demographic and clinical characteristics of SARS-CoV-2-positive psychiatric in-patients: A case-control study in the psychiatric wards of a Great Metropolitan Hospital in Milan.

During the first Covid-19 outbreak, the Niguarda Hospital of Milan featured two Psychiatry wards, one for SARS-CoV-2 positive patient and one for patients requiring hospitalization and negative for SARS-CoV-2. The two groups of patients were compared and were similar in distribution of psychiatric diagnosis, duration of illness and previous hospitalizations. SARS-CoV-2 positive participants had a lower severity of symptoms both at admission and discharge, a lower frequency of psychotic symptoms and substance intoxication at admission. These findings suggest that patients admitted to the COVID ward were hospitalized not only for their mental health condition but also because of the infection.

pH-triggered conduction of amine-functionalized single ZnO wire integrated on a customized nanogap electronic platform.

The electrical conductance response of single ZnO microwire functionalized with amine-groups was tested upon an acid pH variation of a solution environment after integration on a customized gold electrode array chip. ZnO microwires were easily synthesized by hydrothermal route and chemically functionalized with aminopropyl groups. Single wires were deposited from the solution and then oriented through dielectrophoresis across eight nanogap gold electrodes on a platform single chip. Therefore, eight functionalized ZnO microwire-gold junctions were formed at the same time, and being integrated on an ad hoc electronic platform, they were ready for testing without any further treatment. Experimental and simulation studies confirmed the high pH-responsive behavior of the amine-modified ZnO-gold junctions, obtaining in a simple and reproducible way a ready-to-use device for pH detection in the acidic range. We also compared this performance to bare ZnO wires on the same electronic platform, showing the superiority in pH response of the amine-functionalized material.

Nanosized optoelectronic devices based on photoactivated proteins.

Molecular nanoelectronics is attracting much attention, because of the possibility to add functionalities to silicon-based electronics by means of intrinsically nanoscale biological or organic materials. The contact point between active molecules and electrodes must present, besides nanoscale size, a very low resistance. To realize Metal-Molecule-Metal junctions it is, thus, mandatory to be able to control the formation of useful nanometric contacts. The distance between the electrodes has to be of the same size of the molecule being put in between. Nanogaps technology is a perfect fit to fulfill this requirement. In this work, nanogaps between gold electrodes have been used to develop optoelectronic devices based on photoactive proteins. Reaction Centers (RC) and Bacteriorhodopsin (BR) have been inserted in nanogaps by drop casting. Electrical characterizations of the obtained structures were performed. It has been demonstrated that these nanodevices working principle is based on charge separation and photovoltage response. The former is induced by the application of a proper voltage on the RC, while the latter comes from the activation of BR by light of appropriate wavelengths.

Nanogap structures for molecular nanoelectronics.

This study is focused on the realization of nanodevices for nano and molecular electronics, based on molecular interactions in a metal-molecule-metal (M-M-M) structure. In an M-M-M system, the electronic function is a property of the structure and can be characterized through I/V measurements. The contact between the metals and the molecule was obtained by gold nanogaps (with a dimension of less than 10 nm), produced with the electromigration technique. The nanogap fabrication was controlled by a custom hardware and the related software system. The studies were carried out through experiments and simulations of organic molecules, in particular oligothiophenes.