The Effects of Different Processing Methods on the Levels of Biogenic Amines in Zijuan Tea.

This study aimed to evaluate the effects of processing methods on the content of biogenic amines in Zijuan tea by using derivatization and hot trichloroacetic acid extraction with HPLC-UV. The results showed that the most abundant biogenic amine in the original leaves was butylamine, followed by ethylamine, methylamine, 1,7-diaminoheptane, histamine, tyramine, and 2-phenethylamine. However, during the process of producing green tea, white tea, and black tea, the content of ethylamine increased sharply, which directly led to their total contents of biogenic amines increasing by 184.4%, 169.3%, and 178.7% compared with that of the original leaves, respectively. Unexpectedly, the contents of methylamine, ethylamine, butylamine, and tyramine in dark tea were significantly reduced compared with those of the original leaves. Accordingly, the total content of biogenic amines in dark tea was only 161.19 µg/g, a reduction of 47.2% compared with that of the original leaves, indicating that the pile-fermentation process could significantly degrade the biogenic amines present in dark tea.

The Pygmalion Effect to Piano Teaching From the Perspective of Educational Psychology.

Aiming at the problem of low student enthusiasm in piano teaching, this work tried to apply "Pygmalion effect" to piano teaching from the perspective of educational psychology. Forty-five students were chosen from nine classes in grades 2, 4, and 6 of a central elementary school in Beijing City using experimental research, and the experimental group and the control group were set up. A questionnaire was adopted to conduct the pre-test and post-test of the experiment, which were done to analyze the factors that affect the attitude of students toward music learning and the effect of piano teaching. The results show that the encouragement level of the piano teacher and the enthusiasm of the students in the piano course were significantly correlated at the 0.01 level. There was also a significant correlation between self-efficacy and student piano learning enthusiasm at the 0.01 level. Furthermore, the pre-test and post-test results showed that the students in the experimental group of each grade generally performed much better in piano learning than the students in the control group, which proves that the "Pygmalion effect" can play an excellent interventional role in piano teaching. In this research, the value of "Pygmalion effect" in the educational psychology of piano music education in primary schools was deeply studied to explore the possibility of a novel piano teaching model. The research results show that teacher encouragement can stimulate the subjective initiative of students and make them perform better in piano learning. This research provides reference and ideas for the combination of education- and psychology-related research in the music classroom.

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The current outbreak of coronavirus disease 2019 (COVID-19) in Wuhan, China, has posed significant threats to international health. By Feb. 20, 2020, 74 576 cases have been confirmed and over 2 118 deaths have reported in the Chinese mainland. Chinese administrations have carried out immediate and prompt measures to stop the spread of the virus. Wuhan city has been shut down since Jan. 23, and more than 30 thousand medical workers have been recruited to Hubei province. Two temporary hospitals were constructed to treat severe pneumonia patients, and 15 mobile cabin hospitals were built to treat mild pneumonia cases. Significant improvement regarding the pathogenesis, epidemiology, and diagnosis and therapy for the COVID-19 has been achieved to stop the spread of the epidemics.