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In this study, single Ni 2 clusters (two Ni atoms bridged by a lattice oxygen) are successfully synthesized on monolayered CuO. They exhibit a remarkable activity toward low-temperature CO 2 thermal dissociation, in contrast to cationic Ni atoms that nondissociatively adsorb CO 2 and metallic Ni ones that are chemically inert for CO 2 adsorption. Density functional theory calculations reveal that the Ni 2 clusters can significantly alter the spatial symmetry of their unoccupied frontier orbitals to match the occupied counterpart of the CO 2 molecule and enable its low-temperature dissociation. This study may help advance single-cluster catalysis and exploit the unexcavated mechanism for low-temperature CO 2 activation.

A severe public health crisis has been declared worldwide since coronavirus disease 2019 (COVID-19) was classified as a pandemic of acute respiratory infectious disease by the World Health Organisation (WHO). China has taken strict measures to curb the spread of the disease to save lives, and has managed to control the outbreak. COVID-19 is mainly transmitted through respiratory droplets and close physical contact, so it is challenging to prevent nosocomial infection and possible spread during dental treatment. Since the initial phase of the COVID-19 outbreak, a disease prevention and control strategy based on the new concept of population risk classification and rational use of personal protective equipment has been implemented by the Peking University Hospital of Stomatology. Nosocomial infection prevention and control concepts and measures relating to dental diagnosis and treatment are critically checked in the hospital. Our experiences in handling this situation are shared here and may have wide-ranging implications for infection prevention and control (IPC) for COVID-19 in dental practices worldwide.

Objective: To summarize the complications' prevention and nursing experience for patients after autologous transplantation of the microvascular submandibular gland for severe keratoconjunctivis sicca., Methods: Retrospective analysis of 141 patients(151 sides) after autologous microvascular submandibular gland transfer operation was undertaken to record the timing and incidence of major complications and to summarize the nursing experience., Results: The main complications after the transplantation were: vascular crisis, catheter obstruction, salivary fistula and temporary paralysis of hypoglossal nerve. Related nursing measures in response to these complications were discussed., Conclusion: Targeted nursing interventions for patients with autologous transplantation the submandibular gland have a positive effect on the prevention of the surgical complications.

In the present study we made out an animal model on rabbit whose trigeminus and facialis nerves were simultaneously or only the latter one was severed. The pathological changes in facial muscle atrophy under different nerve injuries were investigated. The degeneration of contractile proteins of upper lip muscle -- myosin and actin was observed. In addition, we also examined the ultrastructural changes in the muscle atrophy in the two above-mentioned nerve injury cases. We observed that the intact trigeminus nerve could delay and lighten the atrophy of facialis-denervated facial muscle and attenuate the degeneration of myosin and actin, as well as decrease the increment of collagen and maintain the ultrastructure of the thick and thin muscle filaments. These results may provide the possibility of improvement of clinical treatment for facial muscle palsy.