复合氨基酸稀土元素螯合物的生产和应用研究进展

本文总结了国内外复合氨基酸稀土元素螯合物生产工艺的研究和进展情况以及降本增效的综合利用措施,对农作物施用氨基酸稀土元素螯合物的方法作了阐述.使用结果表明复合氨基酸稀土元素螯合物具有用量少、成本低、回报率高的特点,不但能提高农作物的产量,改善品质,还能有效起到灭菌、杀虫、除草、降低农药残留量的作用,是很有发展前途的新型肥料.     

ICP-MS测定钢中痕量元素Mn、Ti、Mo

建立了ICP-MS测定钢中锰、钛、钼的分析方法。实验优化了仪器的工作参数,选择了适合锰、钛、钼测定的功率、雾化气、辅助气、冷却气等仪器条件,讨论了基体效应等对测定元素信号的影响和消除。锰、钛、钼的质量浓度在0～100 ng/mL范围内有良好的线性关系,相关系数在0.999%以上,测定范围为0.000 01%～0.01%,本方法准确、快速、简便。     

Trace Elements and Rare Earth Elements of Sulfide Minerals in the Tianqiao Pb-Zn Ore Deposit, Guizhou Province, China

Trace elements and rare earth elements(REE)of the sulfide minerals were determined by inductively-coupled plasma mass spectrometry.The results indicate that V,Cu,Sn,Ga,Cd,In,and Se are concentrated in sphalerite,Sb,As,Ge,and Ti are concentrated in galena,and almost all trace elements in pyrite are low.The Ga and Cd contents in the light-yellow sphalerites are higher than that in the brown and the black sphalerites.The contents of Ge,Ti,In,and Se in brown sphalerites are higher than that in light-yellow sphalerites and black sphalerites.It shows that REE concentrations are higher in pyrite than in sphalerite,and galena.In sphalerites,the REE concentration decreases from light-yellow sphalerites,brown sphalerites,to black sphalerites.The ratios of Ga/In are more than 10,and Co/Ni are less than 1 in the studied sphalerites and pyrites,respectively,indicating that the genesis of the Tianqiao Pb-Zn ore deposit might belong to sedimentary-reformed genesis associated with hydrothermal genesis.The relationship between LnGa and Lnln in sphalerite,and between LnBi and LnSb in galena,indicates that the Tianqiao Pb-Zn ore deposit might belong to sedimentary-reformed genesis.Based on the chondrite-normalized REE patterns,δEu is a negative anomaly(0.13-0.88),andδCe does not show obvious anomaly(0.88-1.31); all the samples have low total REE concentrations(<3ppm)and a wide range of light rare earth element/high rare earth element ratios(1.12-12.35).These results indicate that the ore-forming fluids occur under a reducing environment.Comparison REE compositions and parameters of sphalerites,galenas,pyrites,ores,altered dolostone rocks,strata carbonates,and the pyrite from Lower Carboniferous Datang Formation showed that the ore-forming fluids might come from polycomponent systems,that is,different chronostratigraphic units could make an important contribution to the ore-forming fluids.Combined with the tectonic setting and previous isotopic geochemistry evidence,we conclude that the ore-deposit genesis is hydrothermal,sedimentary reformed,with multisources characteristics of ore-forming fluids.     

论稀土微量及微量元素对比值的相关分析在物质来源中的应用

稀土及微量元素在地球化学“相”(固、熔、溶)的分配服从“稀溶液定律”.据此,可用于地质(相)体物质来源的研究,不同地质(相)体的稀土及微量元素对比值的相关分析,其相关系数值较之稀土元素标准化后的配分曲线(型式图)对比及稀土元素“四分组效应”的对比研究,更能准确地反映其同源程度和同一体系不同“相”间的平衡程度.从黑曜岩中...     

以玉米芯为碳源和生物膜载体的反硝化反应器启动性能研究

通过小试试验,研究了以玉米芯为反硝化碳源和生物膜载体的生物反应器在启动阶段对污水中COD及硝酸盐的去除效果.结果表明,在模拟废水COD 100 mg/L、NO<,3><'->-N 40 mg/L,pH值6.5-7.5条件下,13 d挂膜后间歇处理后的废水COD可降至30 mg/L,18 d挂膜后废水NO<,3><'->-N降至2 mg/L以下.     

Separation of aromatic acids, DOPA, and methyl-DOPA by capillary electrophoresis with dendrimers as buffer additives

The underlying disease of a candidate for lung transplantation, especially advanced pulmonary fibrosis, can cause particular and dramatic difficulties. Pulmonary fibrosis is the end-result of a variety of pathological diseases and their associated processes. This article summarizes the diagnosis and management of some of the more common causes of fibrosis, outlines their natural histories and treatment outcomes, and describes the trade-off of pulmonary fibrosis for lung transplantation. Four main categories of end-stage fibrosis are discussed: idiopathic pulmonary fibrosis, sarcoidosis, pulmonary fibrosis from systemic diseases or drugs, and occupational- or environmental-related pulmonary fibrosis. Each group will be covered systematically and the options and indications for lung transplantation will be addressed.     

Controlled clinical assay in Clonidine, arginine aspartate, alpha-ketoglutarate of Ornithine and Ciproheptadine as growth stimulants in children with short stature

Eighty-one healthy prepubertal children of short stature, between two and twelve years of age, were divided into four homogeneous groups. Each group was treated with a placebo for one year and for a second year with one of the following drugs (double blind): clonidine (CI), arginine asprate (AA), ornithine alphaketoglutare (OKG), or cyproheptadine (Cp). CI and OKG did not better the standard deviation of height. AA and Cp did, but to no greater extent than the placebo. The growth rate did not change in any group. The ratio of bone age/chronological age was significantly higher at the end of the OKG year than at the end of the year with placebo, a difference that was not found in any other group. The prognosis of adult height (TW2) did not change in any group. The standard deviation of weight increased in all groups, both with the placebo and the various drugs, without significant differences between the groups. The CI caused frequent clinical side effects, including a reversible increase in transaminases in one child. The Cp stimulated hunger. The AA and OKG did not produce side-effects and the placebo increased appetite in 11% of the children. Somatomedin C was significantly higher after one year with Cp than after one year with the placebo, significantly higher after the placebo than after CI and AA and there was no difference between the treatment with the placebo and OKG. Growth hormone values in a 24 hour urine sample were so scattered that we do not consider them helpful.(ABSTRACT TRUNCATED AT 250 WORDS)     

Quantitative structure activity relationship for the effect of benzoic acids, cinnamic acids and benzaldehydes on Listeria monocytogenes

We characterized the lymphocytes in the tarsal joint synovium of chickens inoculated with an arthrotropic strain of avian reovirus. Cryostat sections of whole joints taken from 2 days to 35 days postinoculation were analyzed using monoclonal antibodies directed against B lymphocytes, T lymphocytes, and chicken Ia antigen. Plasma cells were morphologically identified using stained sections of whole joints. Time-dependent changes were found in the type and number of positively staining cells. Synoviocytes and cells with a dendritic morphology stained positive for Ia in normal joint sections. T cells, mostly CD8 positive, were present in low numbers in acute phase arthritis (2-6 days postinfection) in the perivascular and superficial regions of the synovium. Subacute arthritis (8-14 days postinfection) was characterized by increased numbers of CD4 and Cd8 T cells in the perivascular and superficial regions. The perivascular T cells began to organize into aggregates, with IgM-positive B cells and plasma cells on the periphery of these aggregates. Some CD8-positive cells were detected on the surface of the articular cartilage. Cells staining positively for Ia were not lymphocytes. Chronic arthritis ( > 14 days postinfection) was characterized by large numbers of T cells in the perivascular and superficial regions, with the CD4-positive T cells found primarily in the lymphoid aggregates of the perivascular regions. IgM-positive B cells were fewer, but more plasma cells, few of which stained positive for IgM, were present. Lymphocytes in chronic arthritis stained positively for Ia. These data suggest that the types, numbers, and activation level of lymphocytes present in the tarsal joints are similar but not identical to those seen in rheumatoid arthritis.     

乙基罗丹明B-高碘酸盐催化光度法测定痕量钌

在钌催化高碘酸盐氧化乙基罗丹明B(ERB)基础上提出了测定钌的动力学方法。测定钌的校正曲线范围为 0.2～ 1.5ng/2 5mL ,检出限低至 1 0 - 1 0 mol/LRu ,对 5,1 0 ,1 5ng/2 5mLRu 测定的相对标准偏差分别为6.60 ,3.2 0和 1.76% (n =1 1 )。反应对ERB ,Ru ,KIO4,H3PO4均为一级 ,在CIO4- CRu 条件下 ,观察到Michaelis类型的动力学 ,催化剂与高碘酸盐形成 1∶1络合物 ,表观活化能为 37.68