Hypoxemia is a common complication of pneumonia, asthma, and bronchopulmonary dysplasia in children.Rapid identification of hypoxemia is of great significance for the disposal and management of critical children.Pulse oximetry is recognized by the World Health Organization as the best way to monitor hypoxemia in children, and it can monitor pulse oxygen saturation noninvasively and continuously.Based on the related literature at home and abroad, combined with the clinical needs of pediatrics, the " Expert consensus on clinical application of pulse oximetry in children" is formulated to improve the understanding of pediatricians and nurses on the application in pediatric clinical practice, principle, operation techniques, and limitations of pulse oximetry.

Objective To understand the public mental health status and related influencing factors during the epidemic of coronavirus disease 2019（COVID-19）. Methods A structured questionnaire was used to conduct a questionnaire survey of the research subjects through an online platform. The public mental health status was assessed using the Symptom Checklist (SCL-90). Logistic regression analysis was used to analyze related influencing factors. Results The survey included 1 078 eligible questionnaires, of which 252 (23.38%) were positive on the SCL-90 scale. For each SCL-90 factor, the highest positive rate was anxiety (41.28%), followed by horror (35.16%), and depression (33.21%). Multivariate logistic regression analysis showed that from Hubei (OR=1.64, P=0.014), male (OR=1.37, P=0.036), medical related occupations or professions (OR=1.57, P=0.008), and high concern over the epidemic (OR=2.19, P=0.013) and known people with suspected or confirmed cases (OR=2.75, P<0.001) were risk factors influencing public mental health. Conclusion The mental health problems of the population during the epidemic of COVID-19 were serious, especially in Hubei. Male groups, medical workers, and people with relatives and friends who have a case need to pay attention to their own mental health. The government should increase the publicity of mental health knowledge to effectively prevent the occurrence and development of mental illness in these people.

Objective To explore the mechanism of Huagan Jiedu decoction in treatment of chronic hepatitis B by testing the influence of the decoction on Serum IL-2, IL-4 and IFN-γ of rat models of chronic hepatic injury. Methods The model of Chronic hepatic injury was established by subcutaneously injecting 40% CCl4-olive oil solution in rats according to the ratio of 3ml per kg. of body weight. 60 healthy rats were divided randomly into a normal group, a model group, a low dose of Huagan Jiedu decoction group, a large dose of Huagan Jiedu decoction group, and a control group (Qingre Jiedu tablet group), 15 cases in each group. The Serum IL-2, IL-4 and IFN-γ were detected in each group separately. Results Compared with the normal group, the Serum IL-2 and IFN-γ were decreased (t=2.401, 2.337, P=0.0349, 0.0378) and the Serum IL-4 was increased (t=2.896, P=0.00861 ) in the model group; Compared with the model group, the Serum IL-2 and IFN-γ were increased (t=2.417, 2.344, P=0.0341, 0.0372, P＜0.05; t=3.114, 2.988, P=0.0052, 0.0068) in the large Huagan Jiedu decoction group and the control group, while the Serum IFN-γ was increased (t=3.049, P=0.0062) in the low dose of Huagan Jiedu decoction group and the Serum IL-4 was decreased (t=3.102, 3.017, 2.979, P=0.0061, 0.0065, 0.0069)in both Huagan Jiedu decoction groups and the control group. Conclusion Large dose of Huagan Jiedu decoction has sound therapeutic effects on rats with chronic hepatic injury by decreaseing the content of the Serum IL-4 and increasing IL-2 and IFN-γ, and adjusting th1/th2 balance.

AIM: To investigate the condition necessary for high-level expression of basic fibroblast growth factor (hbFGF) in Escherichia coli, a dicistron system was constructed. METHODS: The phage T7 gene ?10 N-terminal sequence, present in the expression plasmid pET-3c, was incorporated into the first cistron, the coding region for bFGF was incorporated into the second, and both were under the control of a transcription promotor recognized by the bacteriophage T7 RNA polymerase. RESULTS: Recombinants were transformed into BL21(DE3) and induced by IPTG for expression, accumulation of up to 20% of the total cell protein of bFGF were obtained, showing bioactivity indistinguishable from standard protein. CONCLUSION: It suggested that such dicistron system was effective for enhancing hbFGF expression.