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Photosynthetic Behaviour and Mineral Nutrition of Tamarix gallica Cultivated Under Aluminum and NaCl combined stress

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Phyton-International Journal of Experimental Botany 2019年第3期88卷 239-252页

作者： Dhouha Belhaj Sghaier Insaf Bankaji Sylvia Pedro Isabel Caçador Noomene Sleimi LR.RME-Ressources Matériaux et EcosystèmesFaculty of Sciences of BizerteUniversity of Carthage7021 JarzounaBizerteTunisie MARE-Marine and Environmental Sciences Centre Faculty of Sciences of the University of LisbonPortugal

The lack of knowledge of plant tolerance and differential response to aluminum(Al)encouraged many researchers,in the last decade,to elucidate Al toxicity and tolerance *** current study reported the impact of Al,a toxic element with negative effects on plant growth and development,in halophytic plant Tamarix *** were subjected to different Al concentrations(0,200,500 and 800μM)with or without NaCl(200 mM)***,photosynthesis and mineral content were *** stress had a significant decrease on shoots’biomass production between 19 to 41%,and a little variation on chlorophyll content and photosynthetic efficiency(Fo,Fm,Fv fluorescence’s and Fv/Fm).Furthermore,the Al-treatments did not affect significantly the content of potassium,calcium,and magnesium in different plant parts,whereas NaCl addition to the medium induced a decrease in these elements’*** results have shown that *** is able to accumulate the high levels of Al in shoots and roots,6288μg.g^(-1) DW and 7834μg.g^(-1) DW *** is considered as a hyperaccumulator plant of *** addition,Na+contents in shoots and roots exceed 23000μg.g^(-1) ***,*** presents a high tolerance at the same time to Al and NaCl phytotoxicity,so it is interesting to use in phytoremediation programs.

关键词： Halophyte tolerance combined stress photosynthetic pigments chlorophyll fluorescence Al-accumulation nutrients uptake

Development of multi-functional anchorage support dynamic-static coupling performance test system and its application

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International Journal of Mining Science and Technology 2024年第3期34卷 339-349页

作者： Qi Wang Shuo Xu Bei Jiang Chong Zhang Zhe Sun Jingxuan Liu Cailin Jiao State Key Laboratory for Tunnel Engineering China University of Mining&Technology-BeijingBeijing 100083China Research Center of Geotechnical and Structural Engineering Shandong UniversityJinan 250061China

In underground engineering with complex conditions,the bolt(cable)anchorage support system is in an environment where static and dynamic stresses coexist,under the action of geological conditions such as high stresses and strong disturbances and construction conditions such as the application of high *** is essential to study the support components performance under dynamic-static coupling *** on this,a multi-functional anchorage support dynamic-static coupling performance test system(MAC system)is developed,which can achieve 7 types of testing functions,including single component performance,anchored net performance,anchored rock performance and so *** bolt and cable mechanical tests are conducted by MAC system under different prestress *** results showed that compared to the non-prestress condition,the impact resistance performance of prestressed bolts(cables)is significantly *** the prestress range of 50–160 k N,the maximum reduction rate of impact energy resisted by different types of bolts is 53.9%–61.5%compared to non-prestress *** the prestress range of 150–300 k N,the impact energy resisted by high-strength cable is reduced by76.8%–84.6%compared to non-prestress *** MAC system achieves dynamic-static coupling performance test,which provide an effective means for the design of anchorage support system.

关键词： Anchorage support system Development of test system Dynamic-static coupling test combined stress

combined Drought and Heat stress in Rice: Responses, Phenotyping and Strategies to Improve Tolerance

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Rice science 2021年第3期28卷 233-242页

作者： Maria Vera Jesus DA COSTA Yamunarani RAMEGOWDA Venkategowda RAMEGOWDA Nataraja N.KARABA Sheshshayee M.SREEMAN Makarla UDAYAKUMAR Department of Crop Physiology University of Agricultural SciencesGandhi Krishi Vigyana KendraBangalore 560065India

Simultaneous occurrence of drought and heat stress will have significant negative impact on rice yield,especially under upland *** projected increase in global temperatures and reduced precipitation will increase the frequency of occurrence and intensity of these stresses,threatening rice *** recognizing the importance of combined stress in rice,the knowledge generated in this area is very *** complex,understanding combined stress tolerance of rice under water saving cultivation is more critical towards development of climate resilient rice ***,we summarized the effects of combined stress on rice physiology with more emphasis on reproductive *** responses,phenotyping and physiology challenges and potential strategies for improving combined stress tolerance in rice are also discussed.

关键词： rice drought stress heat stress combined stress flowering grain filling omics response phenotyping genetic enhancement

Characteristics of Uptake and Accumulation of Pb and Cd in Osmanthus fragrans(Thunb.) *** Single and combined stresses of Pb and Cd

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Agricultural Science & Technology 2012年第10期13卷 2219-2225页

作者：王飞胥焘郭强聂小倩梅朋森黄应平三峡库区生态环境教育部工程研究中心(三峡大学) 湖北宜昌443002 宜昌市林业局湖北宜昌443002

[Objective] This study aimed to investigate the characteristics of Pb and Cd uptake and accumulation in Osmanthus fragrans（Thunb.） *** single and combined stress of Pb and Cd.[Method] Pot experiment was adopted with *** seedlings as experimental materials to investigate the effect of single and combined stresses of Pb and Cd on the growth of *** seedlings under 0,50,100,500,1 000 and 2 000 mg/kg of Pb and 0,1,10,50,100 and 200 mg/kg of Cd.[Result] Under the experimental conditions,the growth of *** seedlings was significantly inhibited under moderate Pb stress（500 mg/kg） and high Cd stress（100 mg/kg）;the decreasing order of Pb uptake rate of different *** tissues was root stem leaf;the decreasing order of Cd content of different *** tissues was root stem leaf,while the decreasing order of Cd uptake rate of different *** tissues was stem root leaf.[Conclusion] Under combined stress,low concentrations of Pb and Cd can mutually promote the uptake and accumulation,while high concentrations of Pb and Cd can mutually inhibit the uptake and accumulation.

关键词： Pb Cd Osmanthus fragrans(Thunb.) Lour. Accumulation combined stress

Effect of contact forms on the wear of hard silicon surfaces by soft polymers

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Friction 2021年第5期9卷 918-928页

作者： Zhaoxiang ZHANG Xiaohong JIA Fei GUO Zhongde SHAN Yuming WANG State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Joint Research Center for Rubber and Plastic Seals Tsinghua UniversityBeijing 100084China State Key Laboratory of Advanced Forming Technology&Equipment China Academy of Machinery Science&TechnologyBeijing 100044China

The mechanism of hard surfaces worn by soft polymers is not clearly *** this paper,a new hypothesis has been proposed,it holds that the stress acting on the hard surface under certain working conditions is the main reason for wear of the hard surface by a soft *** hypothesis was investigated by changing the contact form between *** this,friction tests between six polymer spheres and smooth,rough,and inclined monocrystalline silicon surfaces were carried *** results show that for the same tribo-pair,the silicon surface will not be worn in some contact forms,but in other contact forms it will be *** believe the wear of hard surface by a soft polymer is the result of the combined stress state action on the hard surface.

关键词： polymers silicon surface wear combined stress

非比例加载下电镀铜箔的晶粒长大行为(英文)

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材料与冶金学报 2010年第3期9卷 222-228页

作者：小野勇一李成日野大辅日本鸟取大学 Department of Mechanical and Aerospace Engineering Tottori University

Grain growth behavior in a copper foil under nonproportional loading was investigated. The grain growth density decreased with increasing phase shift between normal stress and shear stress. Moreover, under this condition, grains tended to grow in various directions. However, the relative frequency of the grain growth direction was slightly large in the maximum shear stress direction. Therefore, grain growth density is mainly dominated by the equivalent shear stress in Tresca theory in the case of nonproportional loading as well as proportional loading.

关键词： multiaxial fatigue combined stress out-of-phase loading equivalent stress