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Xiaoyan Liu,Jinshun Lv,Jiaxing Xu,Jun Xia,Benlin Dai,Xiangqian Xu,Jiming Xu 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.4
Mutants of Yarrowia lipolytica with high erythritol production were generated through an atmospheric and room temperature plasma (ARTP) mutation system. Among these mutants, Y. lipolytica M53 exhibited the highest erythritol yield. In a batch culture, M53 produced 64.8 g/L erythritol from 100 g/L glycerol. The yields of byproducts (e.g. mannitol, arabitol, and a-ketoglutaric acid) were low, and the mechanisms underlying these changes were examined by measuring enzyme activities in the pentose phosphate pathway. Up to 145.2 g/L erythritol was produced by M53 from 200 g/L of glycerol, and erythritol accumulation was promoted by 3.7 mg/L of Cu2?, 10.15 mg/L of Mn2?, and 30.37 g/L of NaCl. Fed-batch cultivation of M53 in a 5-L fermentor produced 169.3 g/L erythritol with low levels of byproducts within 168 h. This finding confirmed the potential of M53 as an erythritol producer on a commercial scale.
Improvement of dynamic responses of a pedestrian bridge by utilizing decorative wind chimes
Wei-ya Liu,Hai-jun Tang,Xiao-yue Yang,Jiming Xie 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.30 No.3
A novel approach is presented to improve dynamic responses of a pedestrian bridge by utilizing decorative wind chimes. Through wind tunnel tests, it was verified that wind chimes can provide stabilization effects against flutter instability, especially at positive or negative wind angles of attack. At zero degrees of angle of attack, the wind chimes can change the flutter pattern from rapid divergence to gradual divergence. The decorative wind chimes can also provide damping effects to suppress the lateral sway motion of the bridge caused by pedestrian footfalls and wind forces. For this purpose, the swing frequency of the wind chimes should be about the same as the structural frequency, which can be achieved by adjusting the swing length of the wind chimes. The mass and the swing damping level are other two important and mutually interactive parameters in addition to the swing length. In general, 3% to 5% swing damping is necessary to achieve favorite results. In the study case, the equivalent damping level of the entire system can be increased from originally assumed 1% up to 5% by using optimized wind chimes.
Chen Jingzhong,Liu Jiming,Liao Xiaofeng 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.5
Cinnamomum migao H. W. Li is an evergreen tree belonging to the Lauraceae family and is endemic to China. Previous studies have found that the rhizosphere microbiome associated with the C. migao wild population plays an essential role in the production of fruit chemical components. However, it remains unknown whether the rhizosphere microbiome aff ects the production of fruit chemical compounds in cultivated C. migao population. Herein, we studied a 10-year-old fruit-bearing population of C. migao and used techniques such as culturing, amplicon sequencing, and metagenomic sequencing to explore the changes in the rhizosphere microbial community structure over three periods. Meanwhile, the molecular ecological network of the rhizosphere microbiome was constructed based on random matrix theory. The unidentifi ed species were found to belong to fungi and Capnodiales. Sphingomonas sp. mm-1 and Streptomyces scabiei in network hubs were recognized in over three fruiting periods. Further, four network hubs were signifi cantly related to fruit chemical compounds production in C. migao . The higher the number of species annotated, the better the explanation for fruit chemical compounds production in C. migao . The rhizosphere microbiome was found to exert a synergistic eff ect by increasing fruit chemical component production in C. migao . This was evinced through KEGG analysis, which revealed the diff erent metabolic activities aff ected by the rhizosphere microbiome. This study revealed the potential ways and putative keystone taxa of rhizosphere microbiome aff ecting fruit component production in C. migao , which opens up new opportunities for further manipulation and development of the rhizosphere microbiome to promote plant productivity.
Predicting the Weed Control Efficacy of Photosynthesis Inhibitors by PPM Method
HONGJUN ZHANG,HAILAN CUI,JIMING YE,XUE LIU,XIANGJUN LI,CORNE KEMPENAAR,SHOUHUI WEI,HANWEN NI 韓國雜草學會 2009 Weed&Turfgrass Science Vol.29 No.3
The experiment was conducted in a greenhouse in Beijing, China, to determine whether weed control efficacy could be predicted based on Plant Photosynthesis Meter (PPM) values measured shortly after the application of photosynthesis inhibitors. The decrease of PPM values of the weed leaves treated with the mixture of atrazine and bentazone could be measured 1 day after treatment (DAT). The decreased extents depended on weed susceptibility and application dosage. There was significant correlation between the PPM values of the treated leaves 1 to 3 DAT and the biomass reduction 14 DAT. The experimental findings indicated that PPM values measured in early days after treatment could give reasonable prediction on weed control. The herbicide usually provided 90% control by weed biomass when PPM value was about 20 and relatively poor control when PPM value over 20.
( Xiaofeng Liao ),( Jingzhong Chen ),( Ruiting Guan ),( Jiming Liu ),( Qinwen Sun ) 한국균학회 2021 Mycobiology Vol.49 No.4
Cinnamomum migao plants often face different degrees of drought in karst habitats, which can lead to plants’ death, especially in the seedling stage. Widespread of arbuscular mycorrhizal (AM) fungi in karst soils have the potential to address this drought, which is a threat to C. migao seedlings. We inoculated C. migao seedlings with spores from Glomus lamellosum and Glomus etunicatum, two AM fungi widely distributed in karst soils, to observe seedling growth response after simulated drought. Our results showed that 40 g of G. lamellosum and G. etunicatum significantly promoted the growth of C. migao seedlings, 120 days after inoculation. Following a 15-day drought treatment, root colonization of the seedlings with G. lamellosum or G. etunicatum had lower the accumulation of malondialdehyde (MDA) and increased the accumulation of enzymes and osmotic substances in the seedlings. The relative water content in different organs (roots, stems, and leaves) of the drought-stressed seedlings was higher in plants with G. lamellosum or G. etunicatum than in plants without AM fungi colonization. Our results showed that inoculation with AM fungi was an effective means to improve the drought resistance of C. migao seedlings.
Qiu, Jialing,Lu, Xintao,Ma, Lianxiang,Hou, Chuanchuan,He, Junna,Liu, Bing,Yu, Dongyou,Lin, Gang,Xu, Jiming Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.4
Objective: The objective of this study was to investigate the effects of low doses of organic trace minerals (iron, copper, manganese, and zinc) on productive performance, egg quality, yolk and tissue mineral retention, and fecal mineral excretion of laying hens during the late laying period. Methods: A total of 405 healthy hens (HY-Line White, 50-week-old) were randomly divided into 3 treatments, with 9 replicates per treatment and 15 birds per replicate. The dietary treatments included feeding a basal diet + inorganic trace minerals at commercial levels (CON), a basal diet + inorganic trace minerals at 1/3 commercial levels (ITM), and a basal diet + proteinated trace minerals at 1/3 commercial levels (TRT). The trial lasted for 56 days. Results: Compared to CON, ITM decreased (p<0.05) egg production, daily egg mass, albumen height, eggshell strength, yolk Fe concentration, serum alkaline phosphatase activity and total protein, and increased (p<0.05) egg loss and feed to egg ratio. Whereas with productive performance, egg quality, yolk mineral retention, and serum indices there were no differences (p>0.05) between CON and TRT. The concentrations of Fe and Mn in the tissue and tibia were changed notably in ITM relative to CON and TRT. Both ITM and TRT reduced (p<0.05) fecal mineral excretion compared to CON. Conclusion: These results indicate that dietary supplementation of low-dose organic trace minerals reduced fecal mineral excretion without negatively impacting hen performance and egg quality.