Young Wistar rats were divided into six groups,the experimental groups were given La(NO 3) 3 at dose of 20,10,2,0.2,0.1 mg·kg -1 and the control group was given physiological saline respectively for six mo...Young Wistar rats were divided into six groups,the experimental groups were given La(NO 3) 3 at dose of 20,10,2,0.2,0.1 mg·kg -1 and the control group was given physiological saline respectively for six months. The animalswere weighed and the ratios of the liver to body weight were counted. Pathological changes of liver were observed by light microscope and transmission electron microscope. Glutamic oxalacetic transaminase(GOT), glutamic pyruvic transaminase (GPT),gamma glutamyl transferase(γ GT) and alkline phosphatase(ALP) in the serum were measured. The results indicate that the body weight of animals gaines slowly in the group of 20 mg·kg -1 La(NO 3) 3 , but it gained quickly in the rats fed with 0.1 mg·kg -1 La(NO 3) 3. Biochemical indexes have no abnormal changes. In the group of 20 mg·kg -1 La(NO 3) 3, there were lipid droplets and decrease of glycogen in the hepatocytes, denser matrix of the mitochondria, deformation of the nuclei of some hepatocytes to different degree and infiltration of inflammatory cells at portal area. The more the dose of La(NO 3) 3 were given to the rats, the more the number of bodies containing highly electronic dense gravel like granules and the secondary lysosomes with dense bodies. The rats fed with 20 mg·kg -1 La(NO 3) 3 for six months shows injurious effects on the hepatocytes.展开更多
The effect of La(NO3)(3) on natural or artificial aged rice seeds vigor was studied. The results show that the germination rate, germination index and vigor index of aged rice seed increase. Activities of superoxide d...The effect of La(NO3)(3) on natural or artificial aged rice seeds vigor was studied. The results show that the germination rate, germination index and vigor index of aged rice seed increase. Activities of superoxide dismutase, catalase and peroxidase are enhanced. . O-2(-) and malond ialdehyde contents decrease in germinating stage of aged rice seed, and cell membrane permeability of aged rice seeds reduces by treating with La(NO3)(3). The vigor increase of rice natural aged seed is greater than that of artificial aged rice seeds by treating with La(NO3)(3).展开更多
The standard molar reaction enthalpy of the solid-solid coordination reaction La(NO3)3. 6H2O (s) +4Ala(s) (Ala is Alanine)=La(NO3)3·(Ala)4·H2O(s) + 5H2O(1) was studied by using classical solution calorimetry...The standard molar reaction enthalpy of the solid-solid coordination reaction La(NO3)3. 6H2O (s) +4Ala(s) (Ala is Alanine)=La(NO3)3·(Ala)4·H2O(s) + 5H2O(1) was studied by using classical solution calorimetry. The molar dissolution enthalpies of the reactants and the product of the solid-solid coordination reaction in 2 mol/L HCl were measured by using an isoperibol calorimeter. From the results and other auxiliary quantities, the standard molar formation enthalpy of [La (NO3)3·(Ala)4·H2O, s, 298. 15 K] has been determined to be △fHm[La(NO3)3·(Ala)4·H2O, s, 298. 15 K]=-3 864. 248 kJ/mol.展开更多
The single crystals of tristhiourea lanthanum nitrate (TTLaN) have been grown by solution growth using slow evaporation technique. The optical study revealed that the crystal has high transmission with lower cut-off w...The single crystals of tristhiourea lanthanum nitrate (TTLaN) have been grown by solution growth using slow evaporation technique. The optical study revealed that the crystal has high transmission with lower cut-off wavelength of 235.78 nm. The EDAX analysis confirmed the grown compound elements. The presence of functional groups was identified through Fourier transform-infrared technique. The thermal stability of the crystal was determined from thermo gravimetric and differential thermal analysis curve. The second harmonic generation behavior of TTLaN crystal was tested by Kurtz-Perry powder technique. This single novel semiorganic crystal of TTLaN showed very good optical transmission property, high thermal stability and large non-linearity nature.展开更多
The stimulatory effects and associated mechanism of lanthanum nitrate on the root tuber yield of the traditional Chinese medicinal plant Pseudostellaria heterophylla, by means of improved photosynthetic characteristic...The stimulatory effects and associated mechanism of lanthanum nitrate on the root tuber yield of the traditional Chinese medicinal plant Pseudostellaria heterophylla, by means of improved photosynthetic characteristics, were investigated. Field experiments were conducted and the foliage was sprayed with varying concentrations of lanthanum nitrate. The results indicated that growth indexes, chlorophyll and carotenoid contents initially increased, and then decreased in a dose-dependent manner with increasing concentrations of lanthanum nitrate. The fresh and dry weights of root tuber yield per unit area significantly increased by 58.34% and 56.87% with a lanthanum nitrate concentration of 100 mg/L, respectively, compared with the control. Appropriate concentrations of lanthanum nitrate were found to alleviate photosynthetic depression at midday, as well as improve the mean values of photosynthetic rate（Pn）, stomatal conductance（Gs） and transpiration rate（Tr） associated with the diurnal variation in photosynthetic parameters, while reducing intercellular CO2 concentration（Ci）. During the experiment, the chlorophyll fluorescence parameters Fv/Fm, Fv＇/Fm＇, ΦPSII and qP increased initially and then decreased along with the increasing concentration of lanthanum nitrate, while NPQ followed the opposite trend. Correlation analysis revealed that Pn had a significantly positive relationship with seedling height, ground diameter, chlorophyll and carotenoid contents, Gs and ΦPSII, while a negative relationship was observed with Ci and NPQ. Grey relational analysis（GRA） indicated that photosynthetic pigments, ΦPSII and qP were the primary factors impacting photosynthesis. These results suggested that the application of an appropriate concentration of lanthanum nitrate（100 mg/L） was effective in improving growth, root tuber yield and photosynthetic characteristics of Psendoste llaria（P） heterophylla. The regulatory effect of lanthanum nitrate on photosynthesis was related to the promotion of light energy absorption and conversion, improvement in photochemical efficiency and the alleviation of photoinhibition. The improvement of the non-stomatal limitation factor was the primary basis for the mitigation of midday photosynthetic depression.展开更多
Potassium lanthanum nitrate dihydrate [K<sub>2</sub>La（NO<sub>3</sub>）<sub>5</sub>·2H<sub>2</sub>O], abbreviated as KLN, is anew nonlinear optica1 crystal. It bel...Potassium lanthanum nitrate dihydrate [K<sub>2</sub>La（NO<sub>3</sub>）<sub>5</sub>·2H<sub>2</sub>O], abbreviated as KLN, is anew nonlinear optica1 crystal. It belongs to orthogonal crpstal system, mm2 point groupand can transmit light from 0.33 to 2.35μm. Its nonlinear coefficients are three timesas large as those of KDP. KLN is noncritically phase-matched at room temperature for1.06 and 0.95μm lasers. Its threshold power (λβ<sub>θ</sub>/d<sub>eff</sub><sup>2</sup> is less than that of KNbO<sub>3</sub> andLBO at proper wavelengths. KLN contains dihydrate and is deliquescent, but展开更多
The effects of La(NO3)(3) on the liquid culture and the contents of amino acids of Nostoc commune flagelliforme cells were studied. It is indicated from the experimental results that the growth of Nostoc commune flage...The effects of La(NO3)(3) on the liquid culture and the contents of amino acids of Nostoc commune flagelliforme cells were studied. It is indicated from the experimental results that the growth of Nostoc commune flagelliforme cells can be stimulated by La(NO3)(3) at the concentrations from 1 to 200 mg.L-1, and among them the treatment of 100 mg.L-1 La(NO3)(3) has the largest A(670) and dry weight which increased by 64.9% and 61.1%, respectively as compared with the control, and La(NO3)(3) can also influence the contents of some kinds of amino acids in Nostoc commune flagelliforme cells. The contents of aspartic acid and glutamic acid decreased by 59.9% and 57.9%, respectively, and that of proline increased by 24.5% with the treatment of 200 mg.L-1 La(NO3)(3).展开更多
Rare earth elements have been used for 30 years in Chinese agriculture to improve growth and yield. Numerous scientific studies have shown improvements in physiology, mineral nutrition, and growth, though deleterious ...Rare earth elements have been used for 30 years in Chinese agriculture to improve growth and yield. Numerous scientific studies have shown improvements in physiology, mineral nutrition, and growth, though deleterious effects may also occur. Very few studies have been performed on woody species. We exponentially fertilized one-year old black walnut （Juglans nigra L.） seedlings with 0, 0.1, 1, 10, or 100 mg lanthanum （La） and 800 mg nitrogen （N） as NaNO3, （NH4）2SO4, NH4NO3, or no N. One month following final fertilization, growth, mineral nutrition, photosynthesis, chlorophyll, and nitrate reductase activity were assessed. Plants fertilized with the highest level of La had reduced fine root growth, concentrations of magnesium, calcium, nickel, and phosphorus, photosynthesis levels, and chlorophyll a content. Foliar La concentration showed an interaction effect, with three to four times greater concentration in plants fed at 100 mg La to those given 10 mg La for （NH4）2SO4 and NHaNO3 treatments. The results suggested no beneficial effects of La addition at levels used in this study and interactions between N source and La levels did not have an important impact on the growth, mineral nutrition, or physiology of black walnut seedlings.展开更多
文摘Young Wistar rats were divided into six groups,the experimental groups were given La(NO 3) 3 at dose of 20,10,2,0.2,0.1 mg·kg -1 and the control group was given physiological saline respectively for six months. The animalswere weighed and the ratios of the liver to body weight were counted. Pathological changes of liver were observed by light microscope and transmission electron microscope. Glutamic oxalacetic transaminase(GOT), glutamic pyruvic transaminase (GPT),gamma glutamyl transferase(γ GT) and alkline phosphatase(ALP) in the serum were measured. The results indicate that the body weight of animals gaines slowly in the group of 20 mg·kg -1 La(NO 3) 3 , but it gained quickly in the rats fed with 0.1 mg·kg -1 La(NO 3) 3. Biochemical indexes have no abnormal changes. In the group of 20 mg·kg -1 La(NO 3) 3, there were lipid droplets and decrease of glycogen in the hepatocytes, denser matrix of the mitochondria, deformation of the nuclei of some hepatocytes to different degree and infiltration of inflammatory cells at portal area. The more the dose of La(NO 3) 3 were given to the rats, the more the number of bodies containing highly electronic dense gravel like granules and the secondary lysosomes with dense bodies. The rats fed with 20 mg·kg -1 La(NO 3) 3 for six months shows injurious effects on the hepatocytes.
文摘The effect of La(NO3)(3) on natural or artificial aged rice seeds vigor was studied. The results show that the germination rate, germination index and vigor index of aged rice seed increase. Activities of superoxide dismutase, catalase and peroxidase are enhanced. . O-2(-) and malond ialdehyde contents decrease in germinating stage of aged rice seed, and cell membrane permeability of aged rice seeds reduces by treating with La(NO3)(3). The vigor increase of rice natural aged seed is greater than that of artificial aged rice seeds by treating with La(NO3)(3).
基金Financial assist subject of the Chenzhou Teacher' s College Profesor Project.
文摘The standard molar reaction enthalpy of the solid-solid coordination reaction La(NO3)3. 6H2O (s) +4Ala(s) (Ala is Alanine)=La(NO3)3·(Ala)4·H2O(s) + 5H2O(1) was studied by using classical solution calorimetry. The molar dissolution enthalpies of the reactants and the product of the solid-solid coordination reaction in 2 mol/L HCl were measured by using an isoperibol calorimeter. From the results and other auxiliary quantities, the standard molar formation enthalpy of [La (NO3)3·(Ala)4·H2O, s, 298. 15 K] has been determined to be △fHm[La(NO3)3·(Ala)4·H2O, s, 298. 15 K]=-3 864. 248 kJ/mol.
文摘The single crystals of tristhiourea lanthanum nitrate (TTLaN) have been grown by solution growth using slow evaporation technique. The optical study revealed that the crystal has high transmission with lower cut-off wavelength of 235.78 nm. The EDAX analysis confirmed the grown compound elements. The presence of functional groups was identified through Fourier transform-infrared technique. The thermal stability of the crystal was determined from thermo gravimetric and differential thermal analysis curve. The second harmonic generation behavior of TTLaN crystal was tested by Kurtz-Perry powder technique. This single novel semiorganic crystal of TTLaN showed very good optical transmission property, high thermal stability and large non-linearity nature.
基金Project supported by Postgraduate Research&Practice Innovation Program of Jiangsu Provice,Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)the Doctorate Fellowship Foundation of Nanjing Forestry University,National Training Programs of Innovation and Entrepreneurship for Undergraduates(201410298001Z)Training Programs of Innovation and Entrepreneurship for Undergraduates of Nanjing Forestry University(2015sjcx190)
文摘The stimulatory effects and associated mechanism of lanthanum nitrate on the root tuber yield of the traditional Chinese medicinal plant Pseudostellaria heterophylla, by means of improved photosynthetic characteristics, were investigated. Field experiments were conducted and the foliage was sprayed with varying concentrations of lanthanum nitrate. The results indicated that growth indexes, chlorophyll and carotenoid contents initially increased, and then decreased in a dose-dependent manner with increasing concentrations of lanthanum nitrate. The fresh and dry weights of root tuber yield per unit area significantly increased by 58.34% and 56.87% with a lanthanum nitrate concentration of 100 mg/L, respectively, compared with the control. Appropriate concentrations of lanthanum nitrate were found to alleviate photosynthetic depression at midday, as well as improve the mean values of photosynthetic rate（Pn）, stomatal conductance（Gs） and transpiration rate（Tr） associated with the diurnal variation in photosynthetic parameters, while reducing intercellular CO2 concentration（Ci）. During the experiment, the chlorophyll fluorescence parameters Fv/Fm, Fv＇/Fm＇, ΦPSII and qP increased initially and then decreased along with the increasing concentration of lanthanum nitrate, while NPQ followed the opposite trend. Correlation analysis revealed that Pn had a significantly positive relationship with seedling height, ground diameter, chlorophyll and carotenoid contents, Gs and ΦPSII, while a negative relationship was observed with Ci and NPQ. Grey relational analysis（GRA） indicated that photosynthetic pigments, ΦPSII and qP were the primary factors impacting photosynthesis. These results suggested that the application of an appropriate concentration of lanthanum nitrate（100 mg/L） was effective in improving growth, root tuber yield and photosynthetic characteristics of Psendoste llaria（P） heterophylla. The regulatory effect of lanthanum nitrate on photosynthesis was related to the promotion of light energy absorption and conversion, improvement in photochemical efficiency and the alleviation of photoinhibition. The improvement of the non-stomatal limitation factor was the primary basis for the mitigation of midday photosynthetic depression.
文摘Potassium lanthanum nitrate dihydrate [K<sub>2</sub>La（NO<sub>3</sub>）<sub>5</sub>·2H<sub>2</sub>O], abbreviated as KLN, is anew nonlinear optica1 crystal. It belongs to orthogonal crpstal system, mm2 point groupand can transmit light from 0.33 to 2.35μm. Its nonlinear coefficients are three timesas large as those of KDP. KLN is noncritically phase-matched at room temperature for1.06 and 0.95μm lasers. Its threshold power (λβ<sub>θ</sub>/d<sub>eff</sub><sup>2</sup> is less than that of KNbO<sub>3</sub> andLBO at proper wavelengths. KLN contains dihydrate and is deliquescent, but
文摘The effects of La(NO3)(3) on the liquid culture and the contents of amino acids of Nostoc commune flagelliforme cells were studied. It is indicated from the experimental results that the growth of Nostoc commune flagelliforme cells can be stimulated by La(NO3)(3) at the concentrations from 1 to 200 mg.L-1, and among them the treatment of 100 mg.L-1 La(NO3)(3) has the largest A(670) and dry weight which increased by 64.9% and 61.1%, respectively as compared with the control, and La(NO3)(3) can also influence the contents of some kinds of amino acids in Nostoc commune flagelliforme cells. The contents of aspartic acid and glutamic acid decreased by 59.9% and 57.9%, respectively, and that of proline increased by 24.5% with the treatment of 200 mg.L-1 La(NO3)(3).
文摘Rare earth elements have been used for 30 years in Chinese agriculture to improve growth and yield. Numerous scientific studies have shown improvements in physiology, mineral nutrition, and growth, though deleterious effects may also occur. Very few studies have been performed on woody species. We exponentially fertilized one-year old black walnut （Juglans nigra L.） seedlings with 0, 0.1, 1, 10, or 100 mg lanthanum （La） and 800 mg nitrogen （N） as NaNO3, （NH4）2SO4, NH4NO3, or no N. One month following final fertilization, growth, mineral nutrition, photosynthesis, chlorophyll, and nitrate reductase activity were assessed. Plants fertilized with the highest level of La had reduced fine root growth, concentrations of magnesium, calcium, nickel, and phosphorus, photosynthesis levels, and chlorophyll a content. Foliar La concentration showed an interaction effect, with three to four times greater concentration in plants fed at 100 mg La to those given 10 mg La for （NH4）2SO4 and NHaNO3 treatments. The results suggested no beneficial effects of La addition at levels used in this study and interactions between N source and La levels did not have an important impact on the growth, mineral nutrition, or physiology of black walnut seedlings.
