Segregation and Action of Lanthanum in NiCrCoW Alloys

ＴｈｅｐｒｏｐｅｒｔｉｅｓｏｆｈｏｔｄｅｆｏｒｍａｔｉｏｎａｎｄｏｘｉｄａｔｉｏｎｒｅｓｉｓｔａｎｃｅｏｆＮｉＣｏＣｒＷａｌｏｙａｒｅｉｍｐｒｏｖｅｄｂｙａｄｄｉｔｉｏｎｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓ［１～４］ｂｕｔｔｈｅｍｅｃｈａ...     

Effect of Lanthanum on Quantity of Major Microorganism Groups in Yellow Cinnamon Soil

Ｔｈｅｈｉｓｔｏｒｙｏｆａｐｐｌｉｃａｔｉｏｎｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓ（ＲＥＥ）ｉｎａｇｒｉｃｕｌｔｕｒｅｉｓｍｏｒｅｔｈａｎ２０ｙｅａｒｓｉｎＣｈｉｎａ．ＲｅｃｅｎｔｌｙｔｈｅｃｏｎｓｕｍｐｔｉｏｎｏｆＲＥＥｉｓｉｎｃｒｅａｓｅｄｂｙ...     

Effects of Lanthanum on Egg Hatching and Nauplius Metamorphosis of Penaeus Chinensis

ＥｆｅｃｔｓｏｆＬａｎｔｈａｎｕｍｏｎＥｇｇＨａｔｃｈｉｎｇａｎｄＮａｕｐｌｉｕｓＭｅｔａｍｏｒｐｈｏｓｉｓｏｆＰｅｎａｅｕｓＣｈｉｎｅｎｓｉｓＸｉｎＦｕｙａｎ（辛福言），ＹｕａｎＹｏｕｘｉａｎ（袁有宪），ＱｕＫｅｍｉｎｇ（曲克明）（Ｙｅｌｏｗ...     

Kinetic Study on the Induced Coordination Reaction of Lanthanum with p-Acetylcarboxylazo

The absorption spectra of p-ACA(p-acetylcarboxylazo)and its complex with lanthanum ionswere determined.The molar ratio of metal to ligand in the complex was estimated to be 1:2.An inductionperiod was found existing in the coordination reaction between La and p-ACA and the effects oftemperature,acidity and ionic strength on the induction period were studied.The reaction mechanism wasdepicted.The rate equation is consistent with the rate law,R=k[La(H_2O)_6~(3+)][H_3O~+],obtained by kineticmethod.Finally the possible geometric structure of this complex was discussed.     

Effect of Lanthanum Chloride on Membrane Permeability of Corn Root Tissue

The effect of lanthanum ion on membrane permeability of corn root segment is studied.Results shows thattreatment of the root segments with LaCl_3·7H_2O can decrease the ion leakage of the root tissue.The leakagedecreases hy increasing the concentration of lanthanum,and the concentration has no further dependence on ionleakages above 25 μmol/L.After treating the root tissue for one hour with lanthanum ion,the amount of leak-age has linear dependence on time within the first 2 h and after two hours the leakage increases.The ion leakageof the tissue dependes on the time of lanthanum treatment.When the duration of treatment is prolonged,theleakage decreases rapidly and the leakage reaches a minimum at 30 minutes.Other rare earth elements can alsodecrease ion leakage.There is no significant difference in the ion leakage among these elements.     

Synthesis and Electrocatalytic Properties of Complex Oxides Containing Lanthanum

Ａｓａｎｅｗｔｙｐｅｃａｔａｌｙｓｔ,ｃｏｍｐｌｅｘｏｘｉｄｅｓｏｆｐｅｒｏｖｓｋｉｔｅｔｙｐｅｈａｖｅｗｏｎｅｘｔｅｎｓｉｖｅａｔｔｅｎｔｉｏｎｉｎｔｈｅｆｕｎｄａｍｅｎｔａｌａｎｄａｐｐｌｉｅｄｒｅｓｅａｒｃｈ．Ｆｏｒｔｈｉｓｒｅａｓｏｎｔｈｅｙａｒｅｏｆｗｅｌｌｄｅｆｉｎｅｄｓｔｒｕｃｔｕｒｅ,ｓｐｅｃｉａｌｃａｔａｌｙｔｉｃｐｒｏｐｅｒｔｉｅｓａｎｄｈｉｇｈｓｔａｂｉｌｉｔｉｅｓ［１］．Ｆｏｒｅｘａｍｐｌｅ,ＬａＮｉＯ３ｉｓｔｈｅｏｎｌｙｍｅｔａｌｌｉｃｃｏｍｐｏｕｎｄｗｉｔｈｏｒｄ…     

Effects of Lanthanum on Liquid Culture and Contents of Amino Acids ofNostoc Commune Flagelliforme Cells

NotoccommunefiagellghrmebelongstoNostocfamilyofprocary0te,andmainlygrOwsinInnermongoliaAuton0mousRegion,NingXiaHuiAutonom0usRegion,GanshuProvinceandXin-jiangWeiwuerAutonomousRegionetcinChina-Nostoccommunefiagelldormecontainsthehighercontentsofprotein,manykindsofaminoacidsandmineralelementsslichasCa,P,Fe,Mn,Zn,CuandCo.Uptonow,theec0l0gical.i....t....[lj,...[2,3]maincomp0sitionandgrOWth...diti..[4jofN0toccommunefiagelldonnehavebeenstudiedsystematically,buttherehavebeennorep0rts0ntheliq…     

Effect of Lanthanum on Growth and Extracellular Enzyme Acitivty of Erwinia Chrysanthemi in vitro

Ａｌｏｎｇｗｉｔｈｔｈｅｌａｒｇｅｓｃａｌｅａｐｐｌｉｃａｔｉｏｎｏｆｒａｒｅｅａｒｔｈｉｎａｇｒｉｃｕｌｔｕｒｅ，ｇｒｅａｔａｍｏｕｎｔｏｆｒａｒｅｅａｒｔｈｃｏｍｐｏｕｎｄｓｅｎｔｅｒｅｄｅｎｖｉｒｏｎｍｅｎｔｔｏｒｅｓｕｌｔｉｎａｃｕｍｕｌａｔ...     

Lanthanum elicitation on hypocrellin A production in mycelium cultures of Shiraia bambusicola is mediated by ROS generation

Rare earth elements(REEs)have been widely applied as efficient elicitors to improve production of biologically important secondary metabolites in plants.However,their effects on microbial secondary metabolites were seldom reported.In this study,lanthanum(LaCl_3)was used as an elicitor in mycelium cultures of Shiraia bambusicola to stimulate the production of hypocrellin A(HA),a promising photosensitizer for anticancer photodynamic therapy.La~(3+)at 1.0 g/L not only increases HA content by 2.50-fold in mycelia,but stimulates HA exudation to the medium with the highest production(225.05 mg/L)on day 6.Further analysis shows that La~(3+) can induce the intracellular ROS(reactive oxygen species)accumulation with 2.33-fold higher contents of H_2O_2 in mycelium.HA production induced by La~(3+)treatment can be suppressed by ROS scavengers.Further analysis reveals that the elicitation of La~(3+)on HA accumulation is mediated by ROS generation to enhance expression of HA biosynthetical genes.The expression of ATP-binding cassette transporter gene(SbABC)for HA exudation is also regulated partially via ROS generated by NADPH oxidase.These results indicate that the enhanced HA production by La~(3+)might be mediated by ROS signaling pathway.Our results provide a basis for understanding REE elicitation on fungal metabolites and a practical biotechnological process for enhanced production of HA.     

NMR Studies on Eu and La Complexes with Pyridine-2,6-Dicarboxylic Acid and Phen

ＮＭＲＳｔｕｄｉｅｓｏｎＥｕａｎｄＬａＣｏｍｐｌｅｘｅｓｗｉｔｈＰｙｒｉｄｉｎｅ２，６ＤｉｃａｒｂｏｘｙｌｉｃＡｃｉｄａｎｄＰｈｅｎＹａｎｇＱｉｕｑｉｎｇ（杨秋青）（ＥｘｐｅｒｉｍｅｎｔａｌＣｅｎｔｅｒ，ＨｅｂｅｉＮｏｒｍａｌＵｎｉｖｅｒｓｉｔｙ...     

Study on New Kind of Rare Earth-Containing Flocculants of Poly-Ferric Sulfate Chloride

A new kind of rare earth- containing flocculant of poly-ferric sulfate chloride (PFSCRE) was studied, and proved to produce high density floccules growing, make sludge deposit quickly and possess high COD removal rate, so that it is seen to be more effective for the disposal of dying wastewater than PFSC. The optimum process for preparing the PFSCRE is defined as REC/PFSC 1.2% ～ 2.2%. And each correlativity of configuration with capacity of aggregating sludge was respectively educed through analysis and comparison of configurations of them. Finally, a prediction was put forward that it should be the key for development of the PFSCRE agglomerating capacity to manage to increase its degree .of polymerization.     

Effects of Lanthanum Chloride on Activity of Redox System in Plasma Membrane of Rice Seedling Roots

ａｒｅｅａｒｔｈｓｈａｖｅａｂｅｎｅｆｉｃｉａｌｅｆｆｅｃｔｓｏｎｐｒｏｍｏｔｉｎｇｔｈｅｃｒｏｐｇｒｏｗｔｈａｎｄｉｎｃｒｅａｓｉｎｇｉｔｓｙｉｅｌｄ .Ｓｏｍｅｒｅｓｅａｒｃｈｅｒｓｈａｖｅｄｅｍｏｎｓｔｒａｔｅｄｔｈａｔｔｈｅｒａｒｅｅａｒｔｈｓｃａｎｎｏｔｅｎｔｅｒｔｈｅｐｒｏｔｏｐｌａｓｔａｎｄｏｎｌｙｓｔａｙｏｕｔｓｉｄｅｔｈｅｐｌａｓｍａｍｅｍｂｒａｎｅ[1] .Ｔｈｅｒｅｉｓａｎｏｘｉｄａｔｉｏｎ ｒｅｄｕｃｔｉｏｎ (ｒｅｄｏｘ)ｓｙｓｔｅｍｏｎｔｈｅｐｌａｓｍａｍｅｍｂｒａｎｅｏｆｐｌ…     

Influence of La and RE on the Underside Shrinkage of ZA27 Alloy

Ｗｉｔｈｌｏｗｅｒｃｏｓｔ,ｇｏｏｄｆｏｕｎｄｒｙｃｈａｒａｃｔｅｒｉｓｔｉｃｓａｎｄｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓ,ＺＡ２７ａｌｏｙｈａｓａｃｈｉｅｖｅｄｃｏｎｓｉｄｅｒａｂｌｅｓｕｃｅｓｉｎｔｈｅｎｏｎｆｅｒｏｕｓｆｏｕｎｄｒｙｉｎ...     

氯盐体系铟萃取富集试验

针对氯盐体系铟的萃取进行萃取体系、酸度、萃取剂浓度、相比和时间条件试验,对反萃过程中关键影响因素盐酸浓度进行试验。最佳萃取工艺参数为:有机相30%P204、相比(O/A)=1/3、皂化率60%、初始水相pH=0.5、室温混合5min;铟一级萃取率能够达到97.01%,三级逆流萃取能够稳定达到99.5%。反萃工艺参数为相比10/1、盐酸浓度3mol/L、室温混合5min,一级反萃率75.52%,三级反萃率达到100%。经萃取、洗涤、反萃后,铟回收率达到96.8%。     

Effect of Lanthanum and Cerium on Expression of RSCU-PA-32k Gene in Saccharomyces Cerevisiae

Ｃｕｒｒｅｎｔｌｙｔｈｅｉｎｃｉｄｅｎｃｅａｎｄｌｅｔｈａｌｉｔｙｏｆｔｈｒｏｍｂｕｓｉｌｌｎｅｓｓａｒｅｖｅｒｙｈｉｇｈ ,ａｎｄｉｔｓｅｒｉｏｕｓｌｙｔｈｒｅａｔｅｎｓｐｕｂｌｉｃｈｅａｌｔｈ .Ｔｈｒｏｍｂｏｌｙｓｉｓｉｓｏｎｅｏｆｔｈｅｒｅｌａｔｉｖｅｌｙｅｆｆｅｃｔｉｖｅｍｅｔｈｏｄｓｔｏｔｒｅａｔｔｈｅｄｉｓ ｅａｓｅ .Ｓｉｎｇｌｅ ｃｈａｉｎｕｒｏｋｉｎａｓｅ ｔｙｐｅｐｌａｓｍｉｎｏｇｅｎａｃｔｉｖａｔｏｒ (ｓｃｕ ＰＡ 3 2ｋ )ｏｆｌｏｗｍｏｌｅｃｕｌａｒｗｅｉｇｈｔ(3 2ｋＤ)ｗａｓｄｉ…     

邻苯二甲酸与氯化稀土配合物的固相合成及性质研究

应用低温固相反应法合成了稀土氯化物和邻苯二甲酸的三种配合物,并对它们进行了组成分析、TG-DTA、红外光谱、荧光光谱和摩尔电导等的测定,确定配合物的组成为RE2(HL)3C l3.16H2O(RE=N d,Eu,T b;HL=o-C6H4(COOH)(COO-)),与文献报道的液相反应所得的产物组成不同[1,2]。从配合物的荧光激发和发射光谱可以发现,铕、铽的邻苯二甲酸配合物均具有很好的发光性能,且铽的发光性能比铕的发光性能更好。另外,溶解性实验表明配合物可以溶于水、乙醇,不溶于乙醚、丙酮。     

Effects of lanthanum on the growth and essential oil components of lavender under osmotic stress

The effects of lanthanum on growth, soluble sugar content, essential oil contents and quality were studied in lavender plant (Lavandula Angustifolia Mill, Variety 701) under osmotic stress by means of PEG-6000 solution. The results show that osmotic stress could reduce the growth rate of lavender, and increase the content of SSC (soluble sugar concentration) to some extent. Compared with control group, the contents of essential oil in flowers and leaves respectively increase by 45.6% and 48.3% in the osmotic stress group induced by 15% PEG-6000. However, the presence of lanthanum can make the contents of essential oil in the flowers and leaves of stressed lavender plants enhance by 19.4% and 18.6%, respectively. Under osmotic stress, the relative contents of four kinds of lavender essential oil compositions of camphor, linalool, linalyl acetate and lavandulol acetate in the lavender flowers were successively 22.63%, 0.61%, 25.46%, 7.03%, and 20.17%, 0.62%, 20.72%, 10.80%, respectively in the presence and absence of lanthanum. The contents of all four main components of lavender essential oils meet the requirements of the national standard under osmotic stress in the presence of lanthanum. However, in the absence of lanthanum, the contents of linalyl acetate and lavandulol acetate does not meet the requirements of the national standard under osmotic stress. Moreover, the contents of five components of borneol, camphor, eudesmol, caryophyllene oxide and bicyclic sesquiphellandrene from the essential oil of lavender leaves are 12.89%, 3.84%, 8.76%, 11.30% and 8.10%, respectively. The total content of above five components accounts for 44.89% of the essential oil of the lavender leaves. Particularly, the borneol content in leaf essential oil is up to 12.89%. It is 125.2 times the amount of borneol in the flower essential oil. In conclusion, the suitable concentration of lanthanum can improve the adaptability of lavender plants, and heighten the content and quality of lavender essential oil to some extent under osmotic stress.     

Comparison of Economical and Technical Indices on Rare Earth Separation Processes of Bastnasite by Solvent Extraction

ＴｈｅｂａｓｔｎａｓｉｔｅｉｎＢａｉｙｕｎ′ｅｂｏｏｆＩｎｎｅｒＭｏｎｇｏｌｉａｉｓｍｏｒｅｔｈａｎ７０％ｏｆｔｈｅｐｒｏｖｅｎｒａｒｅｅａｒｔｈｒｅｓｏｕｒｃｅｓａｌｏｖｅｒｔｈｅｗｏｒｌｄ．Ｔｈｅｓｉｍｉｌａｒｏｒｅｓｗｅｒｅｄｉｓｃｏｖｅｒｅｄ...     

A comparative study of hydrothermal aging effect on cerium and lanthanum doped Cu/SSZ-13 catalysts for NH_3-SCR

Ce-or La-doped Cu/SSZ-13 catalysts were prepared by a hydrothermal method and Cu,Ce or La ions were incorporated through stepwise ion exchange,The catalyst activity was measured for the ammonia selective catalytic reduction reaction.The structure and composition of catalyst were characterized by using X-ray diffraction,scanning electron microscopy,inductively coupled plasma mass spectrometry solid-state NMR,NH_3-TPD techniques,and the active components were examined by XPS and XANES.The results indicate that the Ce and La doping can both completely preserve the SCR activity of Cu/SSZ-13 above 300℃,but there is also a decrease of activity below 200℃.On the other hand,Ce doping is beneficial to the formation of framework aluminum,stabilizes molecular sieve framework and Cu active sites of Cu/SSZ-13,thereby improves the catalyst hydrothermal stability.But La doping will decrease the amount of framework aluminum and Cu active sites of Cu/SSZ-13 after hydrothermally aging,even destroy zeolite CHA structure.This is quite harmful to the catalyst hydrothermal stability.