Effects of Lanthanum on Root Growth and Senescence of GF43 （ Prunus domestica ） Plantlet in Vitro

The effect and the action mechanism of lanthanum on GF43 plantlet in vitro were studied. The results of experiments show that root growth rate and dry weight of GF43 by LaCI3 treatments increase. The activities of antioxidant enzymes in root system such as superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) apparently enhance. Moreover O^-2 and malond ialdehyde (MDA) contents and cell membrane permeability of GF43 are decreased by LaC13. The relatively stable membrane structure of cell could also be maintained and the root ageing of GF43 plantlet in vitro delays.     

Effects of Neodymium on Nitrogen Metabolism of Plantlet Loquat in Vitro

RareEarthElements (REEs)havespecialelec tricstructuresandtheeffectsonvarietiesofbiologicalactivities .REEspromotingnitrogenmetabolismhasbeenmuchreported[1～4 ] .Ourpreviouspapersstudiedlanthanumandeurioumontherootingofloquatplant letinvitro ,showingthatLaandEucanstimulatethegrowthanddevelopmentofroot ,andenhancetheac tivitiesofnitratereductase (NR)significantly[5,6 ] .ltiswellknownthatnitratereductasecatalyzesthere ductionofNO3- toNH4 .Glutaminesynthetase (GS)andglutamatedehydrogenase…     

Effects of Cerium on Rooting and Physiological-Biochemical Metabolism of Tissue Culture Plantlet from Dioscorea Zingberensis

Effects of Cerium on Rooting and Physiological-Biochemical Metabolism of Tissue Culture Plantlet from Dioscorea Zingberensis     

Effects of Lanthanum on Hydrolytic Enzyme Activities in Red Soil

The effects of La on some hydrolytic enzyme activities in red soil were studied in incubation and pet culture experiments. In the incubation experiment, La slightly stimulates the activities of urease and acidic phosphatase in soil and strongly stimulates sucrase activity in soil. In the pet culture experiment, La stimulates the activities of urease, acidic phosphatase and sucrase to different degrees. The stimulative effects of rare earth elements (REE) on hydrolytic enzyme activities in soil may result in increasing yield of eivps.     

Effects of Lanthanum Ion and Its Complexes on Permeability of Pollen Plasmalemma and Pollen Germination

Effects of Lanthanum Ion and Its Complexes on Permeability of Pollen Plasmalemma and Pollen Germination     

Effects of Lanthanum and Cerium on Acid Phosphatase Activities in Two Soils

To evaluate the security of using thulium, comparision between effects of La and those of Ce on acidic phosphatase activities in red soil and yellow soil in Zhejiang district was studied under conditions of ambient temperature and humidity. Results show that the acid phosphatase from different soil respondes to La and Ce differently. The activity of acid phosphatase in soil 1 declines with the increase of the concentration of La and Ce. The maximum inhibitory ratio of La and Ce reaches 69.8% and 71.0% respectively. But La and Ce have stimulative effect on the activity of acid phosphatase in soil 2.Under the effect of same concentration of the thulium, the acid phosphatase in two soils increases with the extending of culture time.     

Subchronic Toxicity of Lanthanum Nitrate on Liver in Rats

ｌｏｎｇｗｉｔｈｔｈｅｗｉｄｅｓｐｒｅａｄａｐｐｌｉｃａｔｉｏｎｏｆｔｈｅＲＥＥｉｎａｇｒｉｃｕｌｔｕｒｅ ,ａｎｉｍａｌｈｕｓｂａｎｄａｒｙａｎｄｍｅｄｉｃｉｎｅｏｆｏｕｒｃｏｕｎｔｒｙ ,ｔｈｅｉｎｃｒｅａｓｉｎｇｃｏｎｃｅｒｎｗｉｔｈｔｈｅＲＥＥｃａｌｌｓｆｏｒｔｈｅｘｔｅｎｓｉｖｅｓｔｕｄｉｅｓｏｎｔｈｅｉｒｍｅｔａｂｏｌｉｃａｃｃｕｍｕｌａｔｉｏｎａｎｄｂｉ ｏｌｏｇｉｃａｌｅｆｆｅｃｔｓ .ＴｈａｔｓｏｍｅｃｅｌｌｓｃａｎｔａｋｅｉｎＲＥＥｂｙｍｅａｎｓｏｆｐｈａｇｏｃｙｔｏｓｉｓｏｒｐｉ…     

Effects of Lanthanum on Microbial Biomass Carbon and Nitrogen in Red Soil

Ｉｔｈａｓｂｅｅｎｍｏｒｅｔｈａｎ 2 0ｙｅａｒｓｓｉｎｃｅｒａｒｅｅａｒｔｈｓ (ＲＥ)ａｒｅａｐｐｌｉｅｄｉｎａｇｒｉｃｕｌｔｕｒｅ .Ｄｕｒｉｎｇｌａｓｔｙｅａｒｓ ,ｔｈｅａｃｃｕｍｕｌａｔｉｏｎｏｆＲＥｉｎｓｏｉｌｓｗａｓａｃｃｅｌｅｒａｔｅｄｂｅｃａｕｓｅＲＥ ＮＨ4ＨＣＯ3 ｃｏｍｐｌｅｘｆｅｒｔｉｌｉｚｅｒｓｗｅｒｅｅｘｔｅｎｓｉｖｅｌｙａｐｐｌｉｅｄａｎｄｄｉｒｅｃｔｌｙｕｓｅｄｉｎｓｏｉｌｓ[1] ,ｓｏｔｈｅｒｅｉｓａｇｒｏｗｉｎｇｃｏｎｃｅｒｎａｂｏｕｔｔｈｅａｄｖｅｒｓｅｅｆｆｅｃｔｏｆ…     

Influence of Lanthanum on Fluorescence Properties of Ag-BaO Thin Films

Ag-BaO thin films doped with lanthanum were prepared by vacuum deposition. Compared with the normal Ag-BaO thin film, there is almost no change with the shape and the peak site of the fluorescence spectrum; however, fluores-cence emission strength of the whole observation band(325 -600 nm)increases about 40%, and the increase of short wavelength range is more remarkable than that of long wavelength range, which we named “blue-stronger“ phenomenon. Analytic results show that, with the forming of intermetallic compounds between silver and lanthanum, the 4f-state energy levels lie just below the Fermi level within 5 eV. It is the energy exchange between the 4f energy levels and the conduction band that causes the increase effect of fluorescence emission, and it is the optical absorption cross section of 4f electron, which increases with the increase of energy of incidence photon, that gives rise to the “blue-stronger“ phenomenon.     

Effect of Lanthanum on RuBPCase Activity of Tobacco Seedlings

Ｉｔｗａｓｐｒｏｖｅｄ[1] ｔｈａｔｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓ(ＲＥＥ)ｐｒｏｍｏｔｅｔｈｅｇｒｏｗｔｈａｎｄｄｅｖｅｌｏｐｍｅｎｔｏｆｐｌａｎｔｓ ,ａｎｄｉｎｃｒｅａｓｅｔｈｅｙｉｅｌｄｏｆｃｒｏｐｓ .Ｈｏｗ ｅｖｅｒ ,ｔｈｅｉｒｍｅｃｈａｎｉｓｍａｒｅｓｔｉｌｌｌｉｔｔｌｅｋｎｏｗｎ .ＩｔｗａｓｋｎｏｗｎｔｈａｔＲＥＥｉｎｃｒｅａｓｅｓｔｈｅａｃｔｉｖｉｔｉｅｓｏｆｓｏｍｅｅｎｚｙｍｅｓａｎｄａｃｃｅｌｅｒａｔｅｓｔｈｅｐｒｏｃｅｅｄｉｎｇｏｆｐｈｏｔｏｓｙｎｔｈｅｓｉｓｉｎｐｌａｎｔｓ …     

Effects of Lanthanum on Bone Resorbing Activity of Rabbit Mature Osteoclasts Co-Cultured with Osteoblasts

The effects of lanthanum (Ⅲ) on the bone resorbing activity of rabbit mature osteoclasts (OCs) in the presence of osteoblasts (OBs) were studied in vitro by measuring the number and area of absorption pits. La(Ⅲ) at concentrations ranging from 1.00×10-5 to 1.00×10-8 mol·L-1 show no effect on mature OC number (P＞0.05). In the OC-OB co-culture systems without La(Ⅲ), osteoblasts alone did not influence the pit number and area whether the two kinds of cells were in contact or not (P＞0.05). Under the OC-OB not-in-contact condition, the effect of La(Ⅲ) on the bone-resorbing activity of OCs was similar to that of La(Ⅲ) in the absence of OBs (P＞0.05). However, while OCs were in direct contact with OBs, the inhibitory effects of La(Ⅲ) on OCs' bone-resorbing activity decreased at the concentrations of 1.00×10-5, 1.00×10-6 and 1.00×10-7 mol·L-1, and the promotion effects increased at 1.00×10-8 mol·L-1 (P＜0.05). The results suggest that direct cell-cell contact between OC and OB be essential for OBs to play their role in regulating the response of OCs to La(Ⅲ).     

Effect of Lanthanum on Plants under Supplementary Ultraviolet-B Radiation： Effect of Lanthanum on Flavonoid Contents in Soybean Seedlings Exposed to Supplementary Ultraviolet-B Radiation

The effects of solar ultraviolet-B (UV-B,280 ~320 nm) radiation on plants have been studiedintens-ively over the last two decades ,associated withthe re-search onthe biological i mpacts of stratospheric ozonedepletion .There are a large number of reports aboutthe effects of UV-B radiation on crops[1 ~5].Flavonoidcompounds , as secondary metabolites are consideredto play a major role in protecting plants from UV-Bdamage[6].These flavonoids generally absorbthe lightinthe region of 280 ~320 n…     

Effects of Lanthanum on Formation and Bone-Resorbing Activity of Osteoclast-Like Cells

The effect of La3 on formation of osteoclast-like cells in rabbit bone marrow cells induced by 1,25-dihydroxyvitamin D3 and their bone-resorbing activity was evaluated by counting the number of tartrate resistant-acid phosphatase-positive ［TRAP( )］ multi-nucleated cells and measuring the number and surface area of bone resorption pits with photomicrography and image analysis. The formation and morphological characteristics of osteoclast-like cells and bone resorption pits were observed under a phase contrast inverted microscope. La3 promotes the formation of osteoclast-like cells at the concentration of 1.00×10-8mol·L-1 compared with the control group(P<0.01), whereas no significant change in cell number is observed at higher concentrations(1.00×10-5, 1.00×10-6 and 1.00×10-7 mol·L-1)(P>0.05). La3 at the concentration of 1.00×10-8mol·L-1 also increases the number and surface area of the resorption pits(P<0.01), but inhibits the bone-resorbing activity dose-dependently(P<0.01)at higher concentrations(1.00×10-5, 1.00×10-6 and 1.00×10-7 mol·L-1). These findings suggest that La3 may promote or inhibit the formation and bone-resorbing activity of osteoclast-like cells depending on its concentration.     

Synthesis, Structure and Photoluminescent Properties of A Novel Oxadiazole-Functionalized Europium（ Ⅲ ） Complex

Scheme1Synthesisrouteof2benzamide5phenyl[1,3,4]oxadiazole(HL1)andgaveabuffersolution.After2h,thesolutionwas pouredintowater;andthewhiteprecipitatewascol lectedanddriedundervacuum.PureproductHL1was obtainedbyre crystallizationfromethanol,m.p.211～213℃.Ana…     

Effect of Lanthanum on Mycelium Growth and Some Pathogenic Factors

Three soil-transmitted pathogenic fungi including Rhizoctonia solani, Fusarium solani, and Pythium sp. were selected to investigate the effect of lanthanum on their growth and the pathogenic enzymes using liquid culture. Variance analysis shows significant differences among treatments with different concentrations of lanthanum （Rhizoctonia solani F = 6.75 〉 F0.01= 5.99; Fusarium solani F = 18.1 〉 F0.01 = 5.99, Pythium sp. F = 23.29 〉 F0.01 = 5.99）. The inhibitory effect of lanthanum on pathogenic fungi increased with an increase in La concentration. The activities of the three pathogenic enzymes per gram mycelium were promoted remarkably. However, the quantity or the activities of the total enzymes were inhibited because of the strong inhibition of mycelium growth by lanthanum. Meanwhile, the effect of lanthanum on toxins of pathogenic fungi were studied using the seed germination experiment. Toxins of pathogenic fungi are influenced by lanthanum and the virulence decreases significantly with the increase of lanthanum concentration.     

Mechanism of Effect of Lanthanum Nitrate on Vigor of Aged Rice Seeds

Ｓｅｅｄｓｅａｒｌｙｄｅｇｅｎｅｒａｔｅｄｏｒａｇｅｄｂｙｕｎ ｓｕｉｔａｂｌｅｃｕｌｔｉｖａｔｉｏｎｏｒｕｎｓｔｏｒａｇｅｔｅｃｈｎｉｑｕｅｓｍａｙｒｅｓｕｌｔｉｎｄｅｃｒｅａｓｉｎｇｏｆｓｅｅｄｖｉｇｏｒａｎｄｏｆｔｈｅｃｒｏｐｓｏｕｔｐｕｔ,ｅｓｐｅｃｉａｌｌｙｆｏｒｒｉｃｅ.Ｒａｒｅｅａｒｔｈｓａｃｃｅｌｅｒａｔｅｔｈｅｇｅｒｍｉｎａｔｉｏｎａｎｄｇｒｏｗｔｈｏｆｔｈｅｃｒｏｐｓ ,ｓｕｃｈａｓｒｉｃｅ ,ｗｈｅａｔ,ｂａｒｌｅｙ ,ｖｅｇ ｅｔａｂｌｅｓａｎｄｏｉｌｐｌａｎｔｓ[1～ 3] .Ｔｈｅｓｔ…     

Influence of Exogenous Lanthanum on Fertility Parameters of Red Soil and Paddy Soil

Ｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓ (ＲＥＥｓ)ａｒｅａｂｌｅｔｏｉｎｃｒｅａｓｅｙｉｅｌｄｏｆｃｒｏｐｓａｎｄｉｍｐｒｏｖｅｐｒｏｄｕｃｔｑｕａｌｉｔｙ[1] .Ｉｎｒｅｃｅｎｔｙｅａｒｓ ,ＲＥＥｓｗｅｒｅｗｉｄｅｌｙｕｓｅｄａｓｆｅｒｔｉｌｉｚｅｒｉｎａｇｒｉｃｕｌｔｕｒｅｉｎＣｈｉｎａ[2 ] .Ｃｈｅｎｅｔａｌ.[3] ｒｅｐｏｒｔｅｄｔｈｅｃｏｎｃｅｎｔｒａｔｉｏｎｏｆＲＥＥｓｉｎｖａｒｉｏｕｓｓｏｉｌｌａｙｅｒｓｉｎｃｒｅａｓｅｄｓｉｇｎｉｆｉ ｃａｎｔｌｙｉｎｃｏｍｐａｒｉｓｏｎｗｉｔｈｔｈａｔｉｎｔ…     

Synthesis and Fluorescence of Novel Conjugated Europium Complex

Organicelectroluminescence (OEL)hasbeenstudiedextensivelyforitslowdrivevoltage ,suitabilityforintegratedcircuitandpotentialapplicationforlargeflatpaneldisplay[1,2 ] .GreenandblueluminescentmaterialsforOELdeviceshavebeenbasicallysatisfiedforOELapplication[3 ] .Toourknowledge ,searchfornovel ,stable ,strongredluminescentmaterialsisur gentforapplicationofOELdevicesatthepresenttime .Becausesomelanthanideions ,e .g .,Eu3 + andTb3 + ,possessgoodluminescencecharacteristics (highcolorpurity)base…     

Mechanochemical Reaction of Lanthanum Carbonate with Sodium Hydroxide and Preparation of Lanthanum Oxide Nanoparticle

Ｔｈｅｉｍｐｏｒｔａｎｃｅｏｆｎａｎｏｓｉｚｅｄｒａｒｅｅａｒｔｈｏｘｉｄｅｐｏｗｄｅｒｓｉｎｖａｒｉｏｕｓｔｅｃｈｎｉｃａｌａｐｐｌｉｃａｔｉｏｎｓｍａｋｅｓｔｈｅｉｒｐｒｅｐａｒａｔｉｏｎｔｅｃｈｎｏｌｏｇｙａｎｉｎｔｅｒｅｓｔ ｉｎｇｓｕｂｊｅｃｔｆｏｒｒｅｓｅａｒｃｈｗｏｒｋ[1 ] .Ｏｖｅｒｔｈｅｐａｓｔｄｅｃａｄｅｓ,ｍａｎｙｐｒｅｐａｒａｔｉｏｎｍｅｔｈｏｄｓｏｆｎａｎｏ ｓｉｚｅｄｒａｒｅｅａｒｔｈｏｘｉｄｅｓｈａｖｅｂｅｅｎｄｅｖｅｌｏｐｅｄ ,ｉｎｃｌｕｄｉｎｇｐｈｙｓｉｃａｌａｎｄ…     

Structure and Fluorescence Emission of Hetero-Nuclear Complexes of Europium-Lanthanum Nitrates with N,N′-Substituted Adipamide

Ｌｕｍｉｎｅｓｃｅｎｔｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｈａｖｅｂｅｅｎｉｎｔｅｎｓｉｖｅｌｙｓｔｕｄｉｅｄｆｏｒｔｈｅｉｒｗｉｄｅａｐｐｌｉｃａ ｔｉｏｎｓｉｎｐｈｏｔｏ ｄｅｖｉｃｅｓａｎｄｆｌｕｏｒｏ ａｎａｌｙｓｉｓ ,ｅｓ ｐｅｃｉａｌｌｙｉｎｔｈｅｕｓｅａｓｌｕｍｉｎｅｓｃｅｎｔｌａｂｅｌｓｉｎｆｌｕ ｏｒｏ ｉｍｍｕｎｏａｓｓａｙｆｉｅｌｄ[1] .Ｓｉｎｃｅｔｈｅｂａｃｋ ｇｒｏｕｎｄｌｕｍｉｎｅｓｃｅｎｃｅｏｆｂｉｏｌｏｇｉｃａｌｍａｔｅｒｉａｌｓｉｓｕｓｕａｌｌｙｓｈｏｒｔ ｌｉｖｅｄ…