Direct Synthesis of Bienzyme-like Carbide-derived Carbons via Mild Electrochemical Oxidation of Ti 3AlC 2 MAX.

Objective: To develop effective alternatives to natural enzymes, it is crucial to develop nanozymes that are economical, resource efficient, and environmentally conscious. Carbon nanomaterials that have enzyme-like activities have been extensively developed as substitutes for traditional enzymes. Methods: Carbide-derived carbons (CDCs) were directly synthesized via a one-step electrochemical method from a MAX precursor using an ammonium bifluoride electrolyte at ambient conditions. The CDCs were characterized by systematic techniques. Results: CDCs showed bienzyme-like activities similar to that of peroxidase and superoxide dismutase. We systematically studied the dependence of CDC enzyme-like activity on different electrolytes and electrolysis times to confirm activity dependence on CDC content. Additionally, the synthesis mechanism and CDC applicability were elaborated and demonstrated, respectively. Conclusion: The demonstrated synthesis strategy eliminates tedious intercalation and delamination centrifugation steps and avoids using high concentrations of HF, high temperatures, and halogen gases. This study paves the way for designing two-dimensional material-based nanocatalysts for nanoenzyme and other applications.

Lymphocyte blood levels that remain low can predict the death of patients with COVID-19.

ABSTRACT: The outbreak of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been rapidly spreading on a global scale and poses a great threat to human health. However, efficient indicators for disease severity have not been fully investigated. Here, we aim to investigate whether dynamic changes of lymphocyte counts can predict the deterioration of patients with COVID-19.We collected data from 2923 patients with laboratory-confirmed COVID-19. Patients were then screened, and we focused on 145 severe cases and 60 critical cases (29 recovered cases, 31 deaths). The length of hospitalization was divided into five time points, namely admission, 25%, 50%, 75% and discharge or death, according to the principle of interquartile distance. A series of laboratory findings and clinical data were collected and analyzed during hospitalization. The results showed that there were differences in levels of leukocytes, neutrophils and lymphocytes at almost every time point in the severe cases and 60 critical cases (29 recovered cases, 31 deaths). Further analysis showed that 70.2% of the COVID-19 cases had low circulating lymphocyte count, of which 64.1% were severe cases and 85.0% were critical cases (75.9% recovered cases and 93.5% died). Moreover, the lymphocyte count in dead cases was significantly lower than that of critical cases who recovered, at almost every time point in the critical groups. We also divided critical patients into group A (<1.1 × 109/L) and group B (>1.1 × 109/L) according to number of lymphocytes. Through survival analysis, we found that there was no significant difference in survival between group A and group B at admission (P = .3065). However, the survival rate according to lymphocyte levels in group A was significantly lower than that of group B at 25% hospital stay (on average day 6.5), 50% and 75% time points (P < .001).Lymphocyte counts that remain lower after the first week following symptom onset are highly predictive of in-hospital death of adults with COVID-19. This predictor may help clinicians identify patients with a poor prognosis and may be useful for guiding clinical decision-making at an early stage.

Author Correction: AZD9291 inactivates the PRC2 complex to mediate tumor growth inhibition.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Clinical application of ultrasound bronchoscopy guided needle aspiration biopsy under general anesthesia / 中国内镜杂志

Objective To explore the application of transbronchial needle aspiration biopsy (EBUS-TBNA) combined with ultrasound bronchoscopy under the general anesthesia (intravenous anesthesia combined with laryngeal mask). Methods 103 patients with EBUS-TBNA from June 2015 to October 2016 were randomly divided into local anesthesia group and general anesthesia group. The anesthesia group was anesthetized with intravenous anesthesia combined with laryngeal mask, local anesthesia group with conventional tetracaine local anesthesia. The differences in the average number of puncture needles, the diagnosis rate, the operation time, the complications and the comfort of each group were analyzed retrospectively. Results The average number of puncture needle in each group was 5.6 times, and the local anesthesia group was 3.1 times. The diagnosis rate of general anesthesia group was 94.12% and local anesthesia group was 78.85%. There was significant difference between the two groups (χ2 = 5.11, P = 0.024). The average operation time in the general anesthesia group was (14.61 ± 1.52), the local anesthesia group was (32.52 ± 4.14), they had significant difference (t = 29.01, P = 0.000). The number of patients in bleeding and cough of the general anesthesia group were lower than those in the local anesthesia group (χ2 = 4.31, 103.00, P = 0.038, 0.000, respectively). Conclusions EBUS-TBNA under general anesthesia has high diagnostic rate, shortoperating time, painlessness, high comfort and reduce operational risk, worthy of promoting clinical application.

Clinical application of ultrasound bronchoscopy guided needle aspiration biopsy under general anesthesia / 中国内镜杂志

Objective To explore the application of transbronchial needle aspiration biopsy (EBUS-TBNA) combined with ultrasound bronchoscopy under the general anesthesia (intravenous anesthesia combined with laryngeal mask). Methods 103 patients with EBUS-TBNA from June 2015 to October 2016 were randomly divided into local anesthesia group and general anesthesia group. The anesthesia group was anesthetized with intravenous anesthesia combined with laryngeal mask, local anesthesia group with conventional tetracaine local anesthesia. The differences in the average number of puncture needles, the diagnosis rate, the operation time, the complications and the comfort of each group were analyzed retrospectively. Results The average number of puncture needle in each group was 5.6 times, and the local anesthesia group was 3.1 times. The diagnosis rate of general anesthesia group was 94.12% and local anesthesia group was 78.85%. There was significant difference between the two groups (χ2 = 5.11, P = 0.024). The average operation time in the general anesthesia group was (14.61 ± 1.52), the local anesthesia group was (32.52 ± 4.14), they had significant difference (t = 29.01, P = 0.000). The number of patients in bleeding and cough of the general anesthesia group were lower than those in the local anesthesia group (χ2 = 4.31, 103.00, P = 0.038, 0.000, respectively). Conclusions EBUS-TBNA under general anesthesia has high diagnostic rate, shortoperating time, painlessness, high comfort and reduce operational risk, worthy of promoting clinical application.