ABSTRACT
Objective:To compare the serum uric acid levels among employees with different psychological states.Methods:From January 2019 to August 2021, 200 in-service employees of various enterprises and public institutions receiving health screening in PLA General Hospital were selected as the participants for this study. Based on the scores of psychological stress, anxiety, and depression scale, each of the three psychological states was divided into four groups from mild to severe. The baseline data, serum uric acid level, creatinine level, and urea nitrogen level of participants were studied to explore the relationship between different psychological states and changes serum uric acid level.Results:According to the degree of psychological stress, anxiety, and depression, serum uric acid levels were 198.52±30.24 μmol/L, 256.52±10.33 μmol/L, 354.20±15.54 μmol/L, and 399.20±20.20 μmol/L ( F value 694.662, P<0.001), respectively. There was statistical difference in serum uric acid level of employees with different psychological statuses; with the aggravation of psychological status, the serum uric acid level showed a trend of gradually increasing from low to high. There was a positive correlation between the scores of different psychological states and uric acid level ( r=0.885, 0.780, 0.794, P<0.05), and no correlation between uric acid level and creatinine and urea nitrogen levels ( r=1.869, 3.887, 5.798, P>0.05). Conclusions:The serum uric acid level of employees varied with different types of psychological states. The greater the psychological stress is,the more serious the degree of depression and anxiety and the higher the serum uric acid level would be. The increase in uric acid level has no relationship with creatinine and urea nitrogen level.
ABSTRACT
Maize (Zea mays L.) is one of the most important grain crops in the North China Plain. Management practices affect the photosynthetic characteristics and the production of summer maize. This two-year (2014-2015) study examined the effects of different planting patterns and the application of nitrogen to previous winter wheat (Triticum aestivum L.) on the photosynthetic characteristics, yield and radiation use efficiency (RUE) of summer maize. Field experiments used a two-factor split-plot design with three replicates at Taian, Shandong Province, China (36°09' N, 117°09' E). The experiments involved two planting patterns(ridge planting, RP; and uniform row planting, UR) and two nitrogen application levels of previous winter wheat (N1, 112.50 kg ha-1; N2, 225.00 kg ha-1). The results indicated that the application of nitrogen on previous crop and ridge planting of the following crop had significant effects on the photosynthetic characteristics and yields of summer maize. Compared with UR, this study found that RP increased the chlorophyll content index (CCI), leaf area index (LAI), net photosynthetic rate (Pn), dry matter (DM), yield and grain RUE by 4.1%, 6.3%, 5.2%, 6.4%, 8.9% and 9.4%, respectively. The CCI, LAI, Pn, yield, and grain RUE of N2 were 9.7%, 3.3%, 3.7%, 10.0% and 10.1% higher than those of N1, respectively. RP combined with the application of nitrogen on previous crop of winter wheat could increase the CCI, LAI, Pn, DM, ultimately increasing the grain yield and RUE of the following summer's maize. It was concluded that previous crop nitrogen application and RP pattern treatment resulted in optimal cropping conditions for the North China plain.
O milho (Zea mays L.) é uma das culturas de grãos mais importantes da Planície do Norte da China. Práticas de manejo afetam as características fotossintéticas e a produção do milho verão. Este estudo de dois anos (2014-2015) examinou os efeitos de diferentes padrões de plantio e a aplicação de nitrogênio ao trigo de inverno anterior (Triticum aestivum L.) sobre as características fotossintéticas, produtividade e eficiência de uso de radiação (RUE) do milho verão. Experimentos de campo usaram um delineamento em parcelas subdivididas de dois fatores com três repetições em Taian, província de Shandong, China (36°09' N, 117°09' E). Os experimentos envolveram dois padrões de plantio (ridge planting, RP; e uniform row planting, UR) e dois níveis de aplicação de nitrogênio do trigo de inverno anterior (N1, 112,50 kg ha-1; N2, 225,00 kg ha-1). Os resultados indicaram que a aplicação de nitrogênio na cultura anterior e no plantio RP da cultura seguinte teve efeitos significativos nas características fotossintéticas e na produtividade do milho verão. Comparado com o plantio UR, este estudo concluiu que RP aumentou o índice de conteúdo de clorofila (CCI), índice de área foliar (LAI), taxa fotossintética líquida (Pn), matéria seca (DM), produtividade e RUE de grãos em 4,1%, 6,4%, 5,2%, 6,4%, 8,9% e 9,4%, respectivamente. Os valores de CCI, LAI, Pn, produtividade e RUE de N2 foram 9,7%, 3,3%, 3,7%, 10,0% e 10,1% superiores aos de N1, respectivamente. RP combinada com a aplicação de nitrogênio na safra anterior de trigo de inverno poderia aumentar os valores de CCI, LAI, Pn, DM, aumentando o rendimento de grãos e RUE do milho do verão seguinte. Concluiu-se que a aplicação prévia de nitrogênio na colheita e o tratamento com padrão RP resultaram em condições ótimas de cultivo para a planície do norte da China.