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Crosstalk of cold and gibberellin effects on bolting and flowering in flowering Chinese cabbage

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Journal of Integrative Agriculture 2019年第5期18卷 992-1000页

作者： song shi-wei LEI Yu-ling HUANG Xin-min SU wei CHEN Ri-yuan HAO Yan-wei College of Horticulture South China Agricultural University

The flower stalk is the product organ of flowering Chinese cabbage(Brassica campestris *** *** Tsen et Lee),which is cultivated extensively in South *** stalk formation and development,including bolting and flowering,determine the yield of flowering Chinese cabbage;however,the bolting and flowering mechanisms remain to be *** elucidate these processes,we studied the effects of low-temperature and gibberellin(GA)treatments,and their interaction,on stem elongation,bolting time,flowering time,hormone content,and cell morphology in stem of flowering Chinese *** results showed that both cold and GA treatments accelerated bolting time,stem elongation,and flowering ***,cold and GA cotreated plants displayed additive positive *** addition,cold treatments increased the GA,indole-3-acetic acid,and cytokinin contents and altered cell size in the shoot apices of flowering Chinese *** with uniconazole,a GA synthesis inhibitor,strongly delayed bolting time,stem elongation,and flowering time,whereas GA,but not cold treatment,rescued this inhibition,indicating that low temperature accelerates bolting and flowering not only through inducing GA in the shoot apices,but also other *** results provide a theoretical basis for further dissecting the regulatory mechanism of bolting and flowering in flowering Chinese cabbage.

关键词： bolting flowering stem elongation cold gibberellin

Reaction Process of Chromium Slag Reduced by Industrial Waste in Solid Phase

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Journal of Iron and Steel Research International 2007年第1期14卷 12-15页

作者： shi Yu-min DU Xing-hong MENG Qing-jia song shi-wei SUI Zhi-tong School of Materials and Metallurgy Northeastern University Shenyang 110006 Liaoning China Beijing Sentch Environmental Technology Co Ltd Beijing 100089 China Beijing Zhong Sheng Tai Ke Environment Science and Technology Development Co Ltd Beijing 100089 China

M, a particular industrial waste, was selected to detoxify chromium slag at a high temperature. The carbon remaining in M reduced Cr （ Ⅳ ） of Na2 CrO4 borne in the chromium slag to Cr （ Ⅲ ） in the solid phase reaction, and its thermodynamics and kinetics were studied. The reduction process of Na2CrO4 by carbon produced CO, whiCh＇was endothermic. Under the experimental condition, the apparent activation energy was 4. 41 kJ·mol^-1 , the＇apparent order of reaction for Na2 CrO4 was equal to one, and the partial pressure of CO was only 0.22 Pa at 1 330℃.

关键词： chromium slag industrial waste reduction reaction solid phase reaction process

Supplemental blue and red light promote lycopene synthesis in tomato fruits

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Journal of Integrative Agriculture 2019年第3期18卷 590-598页

作者： XIE Bao-xing wei Jing-jing ZHANG Yi-ting song shi-wei SU wei SUN Guang-wen HAO Yan-wei LIU Hou-cheng College of Horticulture South China Agricultural UniversityGuangzhou 510642P.R.China

Lycopene, one of the strongest natural antioxidants known and the main carotene in ripe tomato, is very important for human health. Light is well known to be one of the most important environmental stimuli influencing lycopene biosynthesis; specifically, red light induces higher lycopene content in tomato. However, whether blue light promotes lycopene synthesis remains elusive and exactly how light stimulation promotes lycopene synthesis remains unclear. We applied supplemental blue and red lighting on tomato plants at anthesis to monitor the effect of supplemental blue and red lighting on lycopene synthesis. Our results showed that supplemental blue/red lighting induced higher lycopene content in tomato fruits; furthermore, we found that the expression of key genes in the lycopene synthesis pathway was induced by supplemented blue/red light. The expression of light signaling components, such as red-light receptor phytochromes(PHYs), blue-light receptor cryptochromes(CRYs) and light interaction factors, phytochrome-interacting factors(PIFs) and ELONGATED HYPOCOTYL 5(HY5) were up-or down-regulated by blue/red lighting. Thus, blue and red light increased lycopene content in tomatoes by inducing light receptors that modulate HY5 and PIFs activation to mediate phytoene synthase 1(PSY1) gene expression. These results provide a sound theoretical basis for further elucidation of the light regulating mechanism of lycopene synthesis in tomatoes, and for instituting a new generation of technological innovations for the enhancement of lycopene accumulation in crop production.

关键词： blue light red light lycopene phytochromes cryptochromes

Dynamics of Nitrogen Speciation in Horticultural Soils in Suburbs of Shanghai,China

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Pedosphere 2010年第2期20卷 261-272页

作者： GE Ti-Da HUANG Dan-Feng P. ROBERTS D. L. JONES song shi-wei School of Agriculture and Biology Shanghai Jiao Tong University Shanghai 201101 (China) School of the Environment and Natural Resources University of Wales Bangor Gwynedd LL57 2UW (UK) Key Laboratory of Agro-ecological Processes in Subtropical Region Institute of Subtropical Agriculture Chinese Academyof Sciences Hunan 410125 (China)

Dissolved organic nitrogen （DON） represents a significant pool of soluble nitrogen （N） in soil ecosystems. Soil samples under three different horticultural management practices were collected from the Xiaxiyang Organic Vegetable and Fruit Farm, Shanghai, China, to investigate the dynamics of N speciation during 2 months of aerobic incubation, to compare the effects of different soils on the mineralization of ^14C-labeled amino acids and peptides, and to determine which of the pathways in the decomposition and subsequent ammonification and nitrification of organic N represented a significant blockage in soil N supply. The dynamics of N speciation was found to be significantly affected by mineralization and immobilization. DON, total free amino acids, and NH^＋-N were maintained at very low levels and did not accumulate, whereas NO3^--N gradually accumulated in these soils. The conversion of insoluble organic N to low-molecular-weight （LMW） DON represented a main constraint to N supply, while conversions of LMW DON to NH4^＋-N and NH4^＋-N to NO3^--N did not. Free amino acids and peptides were rapidly mineralized in the soils by the microbial community and consequently did not accumulate in soil. Turnover rates of the additional amino acids and peptides were soil-dependent and generally followed the order of organic soil 〉 transitional soil 〉 conventional soil. The turnover of high-molecular-weight DON was very slow and represented the major DON loss. Further studies are needed to investigate the pathways and bottlenecks of organic N degradation.

关键词： amino acids dissolved organic N mineralization N transformation peptides

Effects of Nitrogen Forms on Carbon and Nitrogen Accumulation in Tomato Seedling

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Agricultural Sciences in China 2008年第11期7卷 1308-1317页

作者： GE Ti-da song shi-wei CHI Ming-han HUANG Dan-feng K Iwasaki Key Laboratory of Subtropical Agriculture Ecology Institute of Subtropical Agriculture Chinese Academy of Sciences Changsha 410125 P.R. China Ehime University United Graduate School of Agricultural Sciences Matsuyama 790-8566 Japan School of Agriculture and Biology Shanghai Jiao Tong University Shanghai 201101 P.R. China Faculty of Agriculture Kochi University Kochi 783-8502 Japan

Utilization of organic nitrogen （N） is an important aspect of plant N assimilation and has potential application in sustainable agriculture. The aim of this study was to investigate the plant growth, C and N accumulation in leaves and roots of tomato seedlings in response to inorganic （NH4^＋-N, NO3^-N） and organic nitrogen （Gly-N）. Different forms of nitrogen （NH4^＋-N, NO3^--N, Gly-N） were supplied to two tomato cultivars （Shenfen 918 and Huying 932） using a hydroponics system. The plant dry biomass, chlorophyll content, root activity, total carbon and nitrogen content in roots and leaves, and total N absorption, etc. were assayed during the cultivation. Our results showed that no significant differences in plant height, dry biomass, and total N content were found within the first 16 d among three treatments; however, significant differences in treatments on 24 d and 32 d were observed, and the order was NO3^--N 〉 Gly-N 〉 NH4^＋-N. Significant differences were also observed between the two tomato cultivars. Chlorophyll contents in the two cultivars were significantly increased by the Gly-N treatment, and root activity showed a significant decrease in NHa^＋-N treatment. Tomato leaf total carbon content was slightly affected by different N forms; however, total carbon in root and total nitrogen in root and leaf were promoted significantly by inorganic and organic N. Among the applied N forms, the increasing effects of the NH4^＋-N treatment were larger than that of the Gly-N. In a word, different N resources resulted in different physiological effects in tomatoes. Organic nitrogen （e.g., Gly-N） can be a proper resource of plant N nutrition. Tomatoes of different genotypes had different responses under organic nitrogen （e.g., Gly-N） supplies.

关键词： tomato (Solanum lycopersicum) inorganic nitrogen organic nitrogen C and N accumulation growth

A Study of GaN Grown on SiH_(4) Pre-Treated 6H-SiC Substrates

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Chinese Physics Letters 2012年第1期29卷 268-271页

作者： song shi-wei LIANG Hong-wei LIU Yang XIA Xiao-Chuan SHEN Ren-Sheng LUO Ying-Min DU Guo-Tong School of Physics and Optoelectronic Technology Dalian University of TechnologyDalian 116024 State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012

GaN thin films are grown on Si-terminated (0001) 6H-SiC substrates pre-treated with SiH_(4) in a metal organic chemical vapor deposition *** influence of the SiH_(4) pre-treatment conditions on the SiC surface is carefully *** is found that SiH_(4) could react with the SiC surface oxide,which will change the surface ***,our experiments demonstrate that SiH_(4) pre-treatment can distinctly influence the AlGaN nucleation layer and the basic characteristics of GaN.

关键词： GaN AlGaN (4)

Improvement of the Quality of a GaN Epilayer by Employing a SiN_(x) Interlayer

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Chinese Physics Letters 2012年第8期29卷 257-260页

作者： YANG De-Chao LIANG Hong-wei song shi-wei LIU Yang SHEN Ren-Sheng LUO Ying-Min ZHAO Hai-Feng DU Guo-Tong State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130023 School of Physics and Optoelectronic Technology Dalian University of TechnologyDalian 116024 Key Laboratory of Excited State Processes Changshun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033

GaN epilayers with a porous SiN_(x) interlayer were grown by metal-organic chemical vapor deposition on c-plane sapphire *** is found that the crystalline qualities are significantly improved with SiN_(x) *** improvement is attributed to the reduction of the density of threading dislocations(TDs)by an over-growth process of GaN grown on a SiN_(x) *** influence mechanism of SiN_(x) interlayers on GaN growth mode is also discussed.

关键词： GaN sapphire interlayer

OCTA characteristics in non-arteritic central retinal artery occlusion and correlation with visual acuity

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International Journal of Ophthalmology(English edition) 2024年第2期17卷 289-296页

作者： Hong-Xia Gong Bin Wu shi-Yong Xie wei Zhang song Chen Tianjin Key Lab of Ophthalmology and Visual Science Department of Ophthalmology for Integrated Traditional Chinese and Western MedicineTianjin Eye HospitalTianjin 300020China Clinical College of Ophthalmology Tianjin Medical UniversityTianjin 300010China Eye Hospital Affiliated to Nankai University Tianjin 300020China

AIM:To observe the retinal and choroidal circulations in patients with non-arteritic permanent central retinal artery occlusion(NA-CRAO)via optical coherence tomography angiography(OCTA)and analyze their correlation with visual ***:Sixty-two eyes with clinically confirmed acute NA-CRAO were included in the study and divided into:A type(mild n=29),B type(moderate n=27)and C type(severe n=6)based on the degree of visual loss,retinal edema,and arterial blood flow delay in fundus fluorescence angiography(FFA).Contralateral healthy eyes were used as the control ***-corrected visual acuity(BCVA),slit lamp microscopy,indirect ophthalmoscopy,fundus color photography,OCTA,and FFA were ***’s correlation analysis was used to determine the correlations between retinal and choroidal vessels and visual ***:There were no statistically significant differences in age,gender,and intraocular pressure among the three types and the control group(P>0.05).Vessel density in deep capillary plexus(VD-DCP)significantly decreased(P<0.05)in all three types of NA-CRAO patients compared to the control *** density in superficial vascular plexus(VD-SVP)significantly decreased(P<0.05)in type A patients and choriocapillaris flow area significantly decreased(P<0.05)in type B and type C patients compared to the control group;while outer retinal flow areas significantly increased in the type A(P<0.05)and decreased in type C patients(P<0.05).The retinal thickness significantly increased in type C group(P<0.05).The VD-SVP at fovea in the type A was significantly lower than both of type B and *** VD-SVP at nasal parafovea in type A and B was significantly lower than type C(P<0.05).The logMAR BCVA of type A was significantly better than that of type B and C groups(P<0.05).Spearman’s correlation analysis showed that the logMAR BCVA was positively correlated with VD-SVP at fovea(r=0.679,P=0.031)and nasal parafovea(r=0.826,P=0.013).CONCLUSION:OCTA is valua

关键词： non-arteritic central retinal artery occlusion fundus fluorescence angiography optical coherence tomography angiography retinal vessel density visual acuity

Study on a probabilistic algorithm for the forming and 3D characterization of special-shaped surfaces under profile grinding

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Advances in Manufacturing 2024年第2期12卷 288-299页

作者： Zhao-Qing Zhang Kai-Ning shi Yao-Yao shi Yi-Hui song Zhe He Ya-song Pu School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an710072People’s Republic of China Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi’an710072People’s Republic of China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine(Northwestern Polytechnical University) Ministry of EducationXi’an710072People’s Republic of China

Profile grinding is the most crucial method for the ultra-precision machining of special-shaped ***,profile grinding produces a unique machining profile,and many random factors in the machining process lead to complex surface *** this study,the structural and probabilistic characteristics of the profile grinding of a special-shaped surface were analyzed,and a probabilistic algorithm for the forming and 3D characterization of special-shaped surfaces under profile grinding was *** forming process of a GH738 blade tenon tooth surface was considered as an example to demonstrate the *** comparison results showed that the simulation results had similar surface characteristics to the measurement results,and the relative error range of the 3D roughness parameter was 0.21%–19.76%,indicating an accurate prediction and characterization of the complex special-shaped surface under the action of multiple factors.

关键词： Special-shaped surface Profile grinding Surface morphology 3D characterization