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     

Effect of Cerium on Expression and Activity of MMP-9 from Human Carcinoma of Bladder Cell Line

Rareearthshaveledtowidespreadinterestsinlifescience ,whilethescientistsdoresearchesdeeplyinmedicalandbiochemicalfields .Rareearthsplaypotentialrolesininhibitingcancer ,andalargenum berofscientistsdedicatethemselvestoit[1] .Thema trixmetalloproteinases (MMPs)areafamilyofatleast1 7humanzinc dependentendopeptidasesthatareca pableofdegradingalmostallextracellularmatrix(ECM)components .Theyareessentialinmanyphys iologicalprocessesandseveralpathologicalconditions ,suchastumorprogression .MMPsare…     

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.     

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…     

Distribution of Cerium Ion in Cordierite Ceramics and Its Effect on Structure of Cordierite Crystal

Cerium addition plays an important role in sintering, transformation and phasicochemical properties of cordierite ceramics. The present work aims at studying the distribution of Ce4+ in cordierite ceramics and its effect on the structure of cordierite crystal by means of differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electronic microscope (SEM) so as to clarify the behavior of Ce4+. Results show that Ce4+ can exist in two forms of CeO2 particles and solid solution in Ce4+ -modified cordierite ceramics by the sol-gel method. The CeO2 particles separately distribute in the cordierite matrix. Ce4+ dissolves little into cordierite crystal, resulting in a decrease of lattice constants ofthe crystal. This kind of distribution behavior of Ce4+ makes us to easily tailor the properties of the cordieritc ceramics.     

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…     

Effects of Cerium on Microstructures and Mechanical Properties of Zn-22%Al Vibration Damping Alloy

Effects of Cerium on Microstructures and Mechanical Properties of Zn-22%Al Vibration Damping Alloy     

Behaviors of Lanthanum and Cerium on Grain Boundaries in Carbon Manganese Clean Steel

The behaviors of La and Ce on gram boundaries in carbon manganese clean steel were investigated by high-reso- lution transmission elecetron microscope （HRTEM）, scanning elecetron microscopy（SEM ）, energy dispersive spectrometer （EDS） and X-ray diffraction（XRD） analysis. The existing forms of rare earths （RE） in clean steel were as follows： dissolved in sohd solution, forming inclusion or second phase containing RE （RE-Fe-P, La-P, Fe-La eutectic and Fe-Ce phase）. The dissolved La or Ce segregated at grain boundaries. The segregation of both S and P at gram boundaries was reduced with suitable RE content. The impact toughness of the steel was improved obviously. La and Ce had effecets on purifying molten steel and modifying inclusions in clean steel, whereas with excessive La or Ce, La-Fe-P, La-P and Fe-La eutecetic phase or Ce-Fe-P and Fe-Ce intermetallic compound would form along grain boundaries, causing the impact energy to decrease significantly.     

Toxic Effects of Lanthanum, Cerium, Chromium and Zinc on Potamogeton Malaianus

iththerapiddevelopmentofrareearthindustryandextensiveapplicationofrareearthinagriculture ,agreatmanyofrareearthelements (REEs)werere leasedintoenvironment ,especiallywaterenviron ment ,andtheconsequentseriousenvironmentpollu tionhasattractedpeople′satten…     

Effects of Cerium Dopant on Ni-B Amorphous Alloy Catalysts Used in 2-Ethylanthraquinone Hydrogenation

A series of Ce-doped Ni-B amorphous alloy catalysts were prepared by a KBH4 reduction method, characterized by ICP, BET, XRD, H2-chemisorption, H2-TPD, etc., and tested in the hydrogenation of 2-ethylanthraquinone. The results of characterization show that with the addition of Ce the amount of H2-chemisorption and H2-TPD areas first increases markedly and then decreases with the maximum appears at the atomic ratio of Ce to Ni of 0.036. The hydrogenation activity also shows the same trend. The effects of Ce are attributed to its dispersion of Ni particles, resulting in the formation of more surface Ni centers. However, much higher Ce contents may result in the decrease of the surface Ni contents. After heat treatment at higher temperatures, the amorphous structure of Ni-B is destroyed.     

Effects of Cerium Oxide on Ni／Al2O3 Catalysts for Decomposition of CH4 and C2H4

Characteristics of carbon deposition of CH4 and C2H4 decomposition over supported Ni and Ni-Ce catalysts were studied by using a pulse reaction as well as BET, TPR, XPS and hydrogen chemisorption techniques. It is found that there is a metal-semiconductor interaction (MScI) in the Ni-Ce catalyst, and the effect of MScI on the carbon deposition of CH4 decomposition is opposite to that of C2H4. A novel model of carbon deposition of CH4 or C2H4 decomposition was proposed.     

Effects of cerium nitrate on the growth and physiological characteristics in Cyclocarya paliurusseedlings

Field studies were conducted to examine the effects of cerium on the growth and physiological characteristics ofCyclo-carya paliurusseedlings by spraying the foliage with different concentrations of ce...     

Distribution and Accumulation of Neodymium and Its Effect on Secretion of Progesterone in Mice

Rareearthelementshavebeenincreasinglyusedinagriculture ,animalhusbandryandfisheryinChinasinceREcanpromotegrowthofcropsandani mals[1,2 ] .However ,studieshaveshownthatoverex posureofREmayhavenegativeortoxiceffectsonor ganisms ,forexample ,inhibitingenzymeactivityandinterferinginmetabolism ,havinghighaffinitytoCa2 bindingsitesanddown regulatingabsorptionandfunc tionofCa2 ,blockingbloodclotting ,inducingpatho histologicallesionsofliver ,aswellasaffectinggo nadalfunction[3～6 ] .Furthermore ,…     

Effects of Rare Earth Elements on Promoting Isoflavonoid Production andRelease of Pueraria Lobata Hairy Roots in Vitro

The effects of various rare earth elements on growth and isoflavonoid production in hairy root cultures of Pueraria lobata (Willd.) Ohwi (strain TR2) cultured in 500 ml flasks were studied. After 32 days of culture, the biomass of hairy roots increase 15 times and reach 3.2 g dry weight. Hairy root growth was inhibited by Y203, NaSeO3 and Sm^3 be-cause of brown formation. But significant promoting effect on root growth due to callus formation was observed in La^3 treatments. It is the most noteworthy that the production of total isoflavonoids and puerarin was enhanced greatly by La^3 treatment. A major portion of increased total isoflavonoids and puerarin was released into medium in La^3 treatment whilethe hairy root viabilities were preserved. Some specific secondary metabolite release processes could be induced by La^3 and their possible mechanism is discussed.