水杨酸类稀土配合物抑菌作用研究

利用抑菌圈法,测定了5-氨基水杨酸及7种水杨酸类稀土配合物对大肠杆菌、枯草芽孢杆菌、金黄色葡萄球菌生长的抑制作用。结果表明,配体和配合物对3种细菌均表现抑菌作用,不同药物的抑菌作用具有选择性,不同的药物对同一种细菌的抑菌作用差异较大;总体上水杨酸类稀土配合物的抑菌效果明显高于5-氨基水杨酸,抑菌活性均随浓度增大而增强;8种药物对枯草芽孢杆菌的生长抑制最好,对大肠杆菌和金黄色葡萄球菌的生长抑制较弱。     

稀土氨基酸配合物的研究进展

氨基酸是生物酶、蛋白质的结构组成单元,是一种无毒、无污染的生物配体,与稀土离子结合形成多样化状态的稀土氨基酸配合物。稀土氨基酸配合物已在很多的研究领域里受到关注,应用比较广泛。本文查阅了2000年以来的有关氨基酸系列稀土配合物研究的文献资料。介绍了温度、pH、反应介质、反应时间等因素对合成配合物的影响。总结了典型的几种氨基酸类稀土配合物的合成及表征方法。重点叙述氨基酸系列稀土配合物的实际应用。     

几种新型Schiff碱及其稀土配合物抑菌活性的研究

采用琼脂稀释法测定了几种新型Schiff碱及其稀土配合物对大肠杆菌、金黄色葡萄球菌、枯草芽孢杆菌的抑菌活性,测得了它们抑制细菌生长的最小浓度。结果表明几种新型Schiff碱及其稀土配合物对几种受试菌均有较强的抑制作用,配合物比相应配体具有更高的抑菌活性。     

稀土-氨基酸配合物生物学领域研究进展

通过回顾近年来稀土-氨基酸配合物的相关研究进展,系统性地阐述其合成方式,结构表征与分析以及在农业、畜牧业、医药等多方面的用途,以期为稀土-氨基酸配合物更深入的研究提供参考依据.     

稀土氨基酸配合物的研究情况分析

系统分析了 1991～ 2 0 0 1年间发表的近百篇有关稀土与氨基酸配合物的文献 ,主要讨论作者国籍、刊物、机构、内容和方向等方面的问题。中国的科研人员对稀土氨基酸二元配合物的合成、性质、结构进行了系统的研究。从 90年代末开始 ,研究朝着稀土 氨基酸 过渡金属异核配合物和以氨基酸为配体的高pH值下镧系 羟基自组装配合物的方向发展     

我国稀土氨基酸固体配合物的研究进展

本文概述了近十年来,我国在稀土氨基酸固体配合物方面的研究进展,介绍了它们的研究意义、应用价值、合成方法、成键特性、配合物的热稳定性、晶体的多聚链状结构等。     

稀土对禾本科豆科牧草效应的研究

试验证明,稀土具有生理活性,能刺激作物生长。合理施用稀土,确能促进农作物的增产。但到目前为止,尚未有人把稀土应用于牧草生产。为了确切评价稀土在牧草生产中应用的可能性及有关的技术措施,1985年我们开始对稀土在牧业上应用效果及技术的研究。从室内研究工作入手,并以盆栽和田间小区试验配合,1986年又以新疆、内     

活性氧参与镧诱导的主根生长抑制

正20世纪70年代起,稀土元素特别是镧作为植物生长刺激剂被广泛应用于农业生产,在农业领域的应用中,稀土起到提高产量、改善品质、提高农作物抗病抗逆能力和缓解重金属伤害等多重效应。研究表明,REEs对植物的生长具有双重作用,低浓度促进生长、提高作物产量,高浓度则对植物有害。根系构型(RSA)在决定植物的水分和养分吸收方面具有决定性的作用。研究发现,中、高浓度镧(La)抑制主根生长,但促进了侧根的发育,从而调节了RSA。     

用猪血、羽毛制取混合氨基酸稀土配合物

本文用猪血和鸡羽毛为原料，分别采用硫酸酸解和盐酸酸解两种工艺，获得混合氨基酸，并进而与混合轻稀土化合物反应制得混合氨基酸稀土配合物。测定了配合物的化学组成，完成了成品的氨基酸含量测定和红外光谱、Ｘ－射线衍射分析。     

稀土在医学领域中应用研究现状

近年来,稀土在生命科学领域的研究不断深入,研究工作从人体组织学和细胞生物学方面入手,逐步进入到稀土在预防和治疗某些疾病方面的病理生理作用方面,从而加快了稀土在临床医学方面的应用进程。一些稀土化合物的消炎、镇痛作用和抑癌作用已得到证实。     

Recent progress report on DNA B-Z transition modulated by rare earth-amino acid complex and Alzheimer's disease amyloid beta

Rare earth dements have unique physical, magnetic, luminescent and catalytic properties. They have been successfully used as medicine and probes in luminescent resonance energy transfer (LRET) for bioassays, as well as reagents for diagnosis in magnetic resonance imaging (MRI). In this progress report, we will focus on recent progress on how rare earth amino complexes bind to DNA and change DNA structure, especially on DNA B-Z transition induced by rare earth amino acid complex and its potential impact on Alzheimer's disease (AD).     

Comparison of Biochemical Effects Induced by Changle between Male and Female Rats Using NMR and ICP-MS Techniques

NMRspectroscopyofbiofluidhasbroughtnew chemistryintolifescienceandclinicalmedicine,and NMRspectroscopy basedapproachhasbeensuccess fullyappliedtothestudiesofbiochemicaleffectsand inborndiseaseswiththeadventofhighfieldNMR spectrometers[1].Inrecentyears,highresolutionNMRhasbeenusedtotherapidmulticomponentanal ysisoflowmolecularweightcompoundsinbiofluid,includingurine,bile,cerebrospinalfluid,saliva,milkandsynovialfluidforclinicaldiagnosisofinborn diseasesandinvestigationofbiochemicaleffectsof…     

土壤中可给态稀土元素的研究进展

本文综述了土壤中可给态稀土元素与植物生长的相关性，土壤中可给态稀土浸提剂的选择以及定量测定方法的研究，详细讨论了我国主要土壤中可给态稀土元素的含量、分布及其影响因子，并提出在今后研究中应值得关注的几个方面，为合理施用稀土微肥提供科学依据。     

Primary Study on Effects of New Rare Earth Agro-Materials on Potato

Using common phosphate as a check, we studied the growth and yield of potato by new rare earth agro-materials including rare earth phosphate (base fertilizer), rare earth whole plant nutrient fertilizer, and amino acid chelated rare earth ( top dressing), which were used in a single or mixed way in Dingxi city, Gansu Province.The results are as follows that ( 1 ) After using new rare earth materials, the plant height increases by 0.4 ～ 5.6 cm and the ripen period is delayed by 4 ～ 9 d.(2) They can improve the potato economic characteristics, enhance productivity, decrease black leg and late blight.The disease index is decreased by 1.6% ～ 10.6%, single plant potato number increases by 0.3 ～ 0.5, and single plant yield increases by 80 g ～ 130 g.(3) The effect of increased yield is significant, and mixed use is better than single use.In the single material treatments, rare earth phosphate is the best, rare earth whole plant nutrient fertilizer and amino acid chelated rare earth are the second, and the increased rate are 14.5%, 8.4%, 9.2% so the material mixture-rare earth phosphate mixed of rare earth whole plant nutrient fertilizer or with amino acid chelated rare earth is economically useable, and increase rate are 25.2% and 24.4% compared with common phosphate.     

Effects of mixed rare earth fertilizer on yield and nutrient quality of leafy vegetables during different seasons

Using Chinese cabbage and rape as test material and examining the same soil conditions at different seasons(spring and autumn), the effects of mixed rare earth fertilizer on the yield and nutrient quality of leafy vegetables were studied to provide a theoretical basis for the application of mixed rare earth fertilizer in agriculture. Results showed a seasonal difference in the nutrient quality of Chinese cabbage and rape. For crops planted in autumn, the soluble sugar and vitamin C content were higher, the titratable acid and nitrate content were lower, and the sugar acid ratio was higher relative to crops planted in spring. Mixed rare earth treatments promoted growth of both crops during both seasons. The plot yield, stem and leaf fresh and dry matter weight, and dry and fresh ratio increased. These increases for Chinese cabbage were greater in autumn than in spring while for rape, the increases were greater in spring than autumn. The soluble sugar content, titratable acid content and sugar acid ratio were increased and the nitrate content decreased, in autumn the effects were more obvious than in spring. In spring, the vitamin C content was increased, and the increase was greater for Chinese cabbage than rape. In autumn, the vitamin C content decreased, and the decrease was greater for rape than Chinese cabbage. At the same time, the content of heavy metals such as Cu, Zn, Cd, Pb and Ni in stems and leaves decreased. This decrease was greater in spring for Chinese cabbage and in autumn for rape.     

Studies on the Voltammetric Behaviors of Rare Earth Ions-Amino Acids

The voltammetric behaviors of rare earth ions-amino acids were studied.The reduction potential of Eu~(3+)was shifted positively and the peak separation of the cathodic and anodic peaks in cyclic voltammogram de-creased when a certain amino acid was added to Eu~(3+) solution.Experimental results showed that Eu~(3+) was re-duced by way of forming complexes with amino acids which were adsorbed on mercury electrode surface.Whenhistidine and formaldehyde existed simultaneously in the solution containing Eu~(3+),a well-defined reversiblecatalytic prewave of Eu~(3+) was obtained.Meanwhile,the reduction current of formaldehyde increased greatlywith the addition of histidine.The mechanism was studied.Several other rare earth ions and amino acids werealso studied preliminarily.     

离子型稀土农用综合技术研究

把离子型稀土主要的各元素和主要配分类型，以富铈农用硝酸稀土作比较为依据，形成离子稀土复合剂在种养业上应用为目的，并研究其生理效应阐明其增效所在     

Bioeffects of Rare Earth Complex on Rats Studied by NMR and ICP-MS Spectroscopy

Thedevelopmentofhigh fieldNMRspectrome terswithincreasedsensitivity,resolution,dynamic rangeandimprovedcomputingcapabilitieshasmade itpossibletouseNMRtechniqueforrapidmulticom ponentanalysisoflowMWcompoundsinbiofluids inordertoassessthetoxicologicaleffe…     

Study on Alfalfa Yield Improved by New Rare Earth Materials for Agriculture

New rare earth(RE) materials for agriculture including RE entire nutrition agent, amino acid chelated RE fertilizer, RE phosphate were used to alfalfa production in Grassland Working Station of Yili, Xinjiang Province, and repetition was 3 with 7 treatments.The result shows that by using new RE materials, the average treatment height of alfalfa increases by 12.5% compared with traditional cultural, and the yield increases from 21.8% to 41.6% compared with that of traditional cultural.These results show that the new materials have significant good effect on alfalfa production.     

Synthesis, Characterization and Fluorescence Properties of Europium, Terbium Complexes with Biphenyl-4-Carboxylic Acid and o-Phenanthroline

Two series of solid complexes of europium and terbium with biphenyl 4-carboxylic acid and phen were synthesized and characterized in this report. Their elemental analysis, molar conductivities and TG-DTA studies indicate that the complexes have the composition of Eu(phen)L3·1/2H2O, Eu0.5RE0.5(phen)L3·1/2H2O; Tb(phen)L3·H2O and Tb0.5RE0.5(Phen)L3·1/2H2O. (RE=Y3 , La3 and Gd3 ; L=biphenyl 4-carboxylic acid; phen=o-Phenanthroline). The studies of their IR, UV 1H NMR and molar conductivities demonstrate that biphenyl 4-carboylic acid is bounded with RE(Ⅲ) ion. Rare earth ions coordinate with two nitrogen atoms of phen molecules directly in these rare earth complexes. The fluorescence spectra and fluorescence lifetimes of the rare earth complexes show that the fluorescent intensity and lifetime of a series of europium complexes are longer than those of the series of terbium complexes as having the some ligands. There are better fluorescent intensity and lifetime of hetero-nuclear rare earth complexes than homo-nuclear rare earth complexes for europium complexes. The fluorescence emission intensity of Eu3 is raised by inert fluorescent rare earth ions (Y3 , Gd3 and La3 ), but in Tb3 hetero-nuclear rare earth complexes the intensity of Tb3 ions are quenched by the inert fluorescent rare earth ions.