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To explore the effects of fresh leaves harvested at different picking periods on aroma quality and chemical characteristics of oolong tea, morning leaves and evening leaves of Tieguanyin were selected as materials and turned into morning tea and evening tea according to the traditional technology. The volatile components of fresh leaves and oolong tea were analyzed by the method of gas chromatography-mass spectrometer (GC-MS), in order to compare their differences between morning oolong tea and evening oolong tea. The results showed that total volatile components of evening tea were 28.3% less than that of morning tea. The content and proportion of alcohol compounds were superior, especially isophytol and trans-nerolidol. The characteristics of volatile components in fresh leaves were different from that in oolong tea. The rate of alcohol compounds was close to that of acid compounds in fresh leaves, while in oolong teas the difference was large. Two kinds of fresh leaves had 56 identical components, that were 4 more than the two kinds of oolong tea. However, among 42 common components of fresh leaves and oolong tea, palmitic acid, dihydroactinidiolide, trans-nerolidol and isophytol were obviously affected by the manufacture technology, and their variation amplitudes were large. It can be seen that the distribution characteristics of volatile compounds of evening leaves and morning ones were different, and the aroma quality of evening tea was better than that of morning tea, especially the refreshing aroma.

Background The urban community health service centers in China have developed for nearly 20 years, but there is a lack of systematic research on their development, progress made, and existing problems. Objective To propose suggestions for the high-quality development of urban community health services centers in China by analyzing their development situation. Methods In October 2022, 50 community health service centers were selected from 13 provinces in the eastern, central and western regions by convenience sampling method. A self-developed research questionnaire based on the key core indicators for the assessment of urban community health services centers included two parts of basic data and evaluation content. Basic data included jurisdictional area, number of employees, number of outpatient visits, etc; the evaluation content included 4 gradeⅠindicators (institutional configuration, service function, service mode, and service support), 13 GradeⅡindicators and 33 GradeⅢindicators. The data of year 2006 (or the first year of the hospital's establishment and data) and 2021 were compared, and the survey results were reported in through "sojump". Results (1) Basic data: the number of community health service centers established before 2006 were 24 (accounting for 48.00%), and 26 after 2006 (accounting for 52.00%) ; comparing the year of 2006 or the first year of establishment, and the year of 2021, the number of employees was 67.00 (40.00, 101.00) and 94.00 (62.00, 162.00) respectively; the number of outpatient visits was 39 324.00 (22 620.00, 118 384.00) and 106 259.00 (44 999.00, 225 851.00) respectively; the total score of the questionnaire was 36.50 (28.13, 46.00) and 69.00 (56.38, 76.00), respectively. (2) The median scores of Grade I indicators institutional configuration, service mode and service function in 2021 were all higher than those in 2006 or the first year of establishment. The relative scoring rate of Grade I indicators in 2021, institutional configuration was 77.27% (25.50/33.00), service mode was 61.84% (23.50/38.00), service function was 76.92% (10.00/13.00), service support was 47.37% (9.00/19.00). The median score of structure area in the institutional configuration indicators was 0; among the service function indicators, the relative scoring rate of the diagnosis and treatment of common and chronic diseases in the community, and the inpatient service content were all 100.00%; the relative scoring rate of inpatient bed utilization rate was 25.00% (1.00/4.00). (3) Score of GradeⅡ、Ⅲ evaluation indicators of service function, service mode, and service support: The median score of public health items in service function increased from 2.00 points in 2006 or the first year of establishment to 9.50 points in 2021. The differences were statistically significant (P