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 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…     

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.     

Synthesis and Electrocatalytic Properties of Complex Oxides Containing Lanthanum

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

Studies on Solvent System of Cesium Chloride and Lanthanum Chloride and Synthesization of Four Types of New Compounds

ＳｔｕｄｉｅｓｏｎＳｏｌｖｅｎｔＳｙｓｔｅｍｏｆＣｅｓｉｕｍＣｈｌｏｒｉｄｅａｎｄＬａｎｔｈａｎｕｍＣｈｌｏｒｉｄｅａｎｄＳｙｎｔｈｅｓｉｚａｔｉｏｎｏｆＦｏｕｒＴｙｐｅｓｏｆＮｅｗＣｏｍｐｏｕｎｄｓＬｉＹａｈｏｎｇ（李亚红），ＲａｎＸｉｎｑｕａｎ...     

Study on Pt/KL Zeolite Catalyst for n-Hexane Aromatization Modified by Lanthanum

Pt/KLze0litecatalystwasfoundtobeahighlyactiveandselectivecatalystf0rthearoma-tizationofn-hexane,onwhichtheselectivitytobenzenewas6~8timeshigherthanthatofcon-venti0nalbifuncti0nalref0rmingcatalyst(Pt/Re/Al,O,-Cl)[lj.However,thiskindofmonofunc-tionalcatalystshowedd0zens0ftimespoorerthantheconventionalcatalystinsulfur-resistance,whichpreventeditfr0m-beingappliedinindus-try['j.Recently,othermetalcomponentssuchasRe,W[3j,F.[4jandrareearth(LaandDy)[5'6JetcwereintroducedtothePt-supportedKLzeo-li…     

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.     

稀土对草鱼卵子孵化的影响

研究了混合稀土——常乐益植素 ( CL- 1 )溶液对草鱼卵子孵化的影响 ,结果表明 :常乐益植素 ( CL-1 )溶液的最佳浓度范围为 5～ 35mg/ L,提高孵化率 1 3%～ 2 5% ,而高浓度的溶液则有抑制作用。     

Effect of NdCl_3 on the Growth and i_PA Level of Detached Etiolated Cotyledons of Brasica Chinensis

ＥｆｅｃｔｏｆＮｄＣｌ３ｏｎｔｈｅＧｒｏｗｔｈａｎｄｉＰＡＬｅｖｅｌｏｆＤｅｔａｃｈｅｄＥｔｉｏｌａｔｅｄＣｏｔｙｌｅｄｏｎｓｏｆＢｒａｓｉｃａＣｈｉｎｅｎｓｉｓＣｈｅｎＫａｏｓｈａｎ（陈靠山），ＺｈａｎｇＪｕｒｅｎ（张举仁）（ＢｉｏｌｏｇｙＤｅｐ...     

Effects of Rare Earths and Its Complex with Extract from Seaweed（Laminaria japonica ） on Growth and Immunization of Penaeid Shrimp （ Penaeus vannamei ）

In China, scientists have applied inorganic com pounds of rare earths (RE), which act as a microele ment fertilizer, to agricultural crops since 1970s[1~3].Recent works have proved that RE can increase aquat ic production. RE has been widely applied i…     

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.     

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

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

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.     

稀土元素镧在金刚石工具胎体材料中的作用机理研究

研究了稀土元素镧对包镶金刚石颗粒的胎体机械性能、磨损性能及其对金刚石粘结性能的影响，确定了以ＬａＮｉ５合金粉末的形式添加稀土镧的方法，利用扫描电子显微镜分析了添加稀土镧前后胎体的组织结构变化、合金胎体中的元素分布情况以及胎体与金刚石之间的界面形态。     

Synthesis of Mg-based composite material with in-situ formed LaH3 and its hydrogen storage characteristics

In this work, a Mg-based composite material with in-situ formed LaH₃, Mg₂NiH₄-LiBH₄ + 20 wt% LaH₃, was prepared by ball milling LiBH₄ and hydrogenated LaMg₂Ni and Mg₂Ni powder mixture, followed by heat treatment at 573 K. The onset dehydrogenation temperature of the composite is reduced by 50 K compared with that of Mg₂NiH₄-LiBH₄. The LaH₃-doped composite shows faster kinetics, absorbing 1.43 wt% hydrogen within 100 s at 423 K, which is 6.5 times faster than Mg₂NiH₄-LiBH₄. Moreover, the composite releases 1.24 wt% hydrogen within 500 s at 573 K, 0.69 wt% higher than Mg₂NiH₄-LiBH₄. The activation energy of the composite is reduced by 8.2 and 80 kJ/mol compared with that of Mg₂NiH₄-LiBH₄ and commercial MgH₂, respectively. The improvement in hydrogen storage properties is attributed to the fact that LaH₃ promotes the generation of nano-sized spongy Mg structure, which has good catalytic activity during the subsequent hydrogenation/dehydrogenation process.     

Dynamic Effects of Cerium on Syntheses of Soluble Protein and Taxol in Suspension Culture of Taxus Chinensis Var. Mairei Cells

ＣｅｌｌｃｕｌｔｕｒｅｏｆＴａｘｕｓｓｐｐ .ｍａｙｂｅｖｉｅｗｅｄａｓａｐｏｔｅｎｔｉａｌａｌｔｅｒｎａｔｉｖｅｔｏｗｈｏｌｅｐｌａｎｔｅｘｔｒａｃ ｔｉｏｎａｓａｓｏｕｒｃｅｏｆｔｈｅａｎｔｉｎｅｏｐｌａｓｔｉｃａｇｅｎｔｔａｘ ｏｌａｎｄｒｅｌａｔｅｄｔａｘａｎｅｓ ,ｃｕｒｒｅｎｔｌｙｉｎｓｈｏｒｔｓｕｐ ｐｌｙ .Ｔｈｅｒｅｆｏｒｅ ,ｈｏｗｔｏｉｎｃｒｅａｓｅｔｈｅｐｒｏｄｕｃｔｉｖｉ ｔｙｏｆｔａｘｏｌｉｎｔｈｅｐｌａｎｔｃｅｌｌｃｕｌｔｕｒｅｈａｓｄｒａｗｎｍｕｃｈａｔｔｅｎｔｉｏｎ .Ｅｌｉ…     

Characteristics and Controlling of LaB_6-ZrB_2 Eutectic Microstructure

ＣｈａｒａｃｔｅｒｉｓｔｉｃｓａｎｄＣｏｎｔｒｏｌｉｎｇｏｆＬａＢ６ＺｒＢ２ＥｕｔｅｃｔｉｃＭｉｃｒｏｓｔｒｕｃｔｕｒｅＣｈｅｎＣｈａｎｇｍｉｎｇ（陈昌明），ＺｈｏｕＷａｎｃｈｅｎｇ（周万城），ＺｈａｎｇＬｉｔｏｎｇ（张立同）（ＮａｔｉｏｎａｌＫｅ...     

Effects of RE-Sb on Gray Cast Iron

ＥｆｆｅｃｔｓｏｆＲＥ－ＳｂｏｎＧｒａｙＣａｓｔＩｒｏｎＸｉｏｎｇＺｈｏｎｇ－Ｍｉｎｇ（熊仲明）；ＺｈａｎｇＳｕｏ－Ｍｅｉ（张锁梅），ＳｈｉＤｏｎｇ－ｙａ（石东崖）；ＳｏｎｇＷｅｉ－Ｘｉ（宋维锡）（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｔａｉｌｕｒｇｙ，Ｕｎｉ...