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Search Results: 1 - 10 of 10404 matches for " Cu/Zn ratio "
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Evaluation of Serum Levels of Essential Trace Elements in Patients with Pulmonary Tuberculosis Before and After Treatment by Age and Gender
F. Pourfallah,S. Javadian,Z. Zamani,R. Saghiri
Pakistan Journal of Biological Sciences , 2011,
Abstract: The purpose of this study was to evaluate the levels of Zinc, Copper, Iron and Copper/Zinc ratio in the serum of adult patients with pulmonary tuberculosis in Iran. Serum levels of Zinc and Copper were determined by flame atomic absorption spectrophotometer and serum iron concentration was measured by using an Auto Analyzer. The study group consisted of 50 pulmonary tuberculosis patients before treatment and after 6 months of anti-tubercular therapy. Levels of serum Zn (p<0.001) and Fe (p<0.001) in TB patients were significantly increased after 6 months of anti-tubercular therapy. However, serum Cu concentration (p<0.01) and Cu/Zn ratio (p<0.05) were decreased after 6 months of anti-tubercular therapy. Some studies indicated a strong association of Zn, Cu, Fe and the Cu/Zn ratio with TB. In this study, we found remarkable change in Cu/Zn ratio. Some researchers mentioned that serum Cu/Zn ratio could be used as an important laboratory marker for diagnosis and treatment of tuberculosis. They also mentioned that trace element levels must be closely monitored during the process of disease.
Evaluation of Serum Levels of Zinc, Copper, Iron, and Zinc/Copper Ratio in Cutaneous Leishmaniasis
F Pourfallah,S Javadian,Z Zamani,R Saghiri
Iranian Journal of Arthropod-Borne Diseases , 2009,
Abstract: "nBackground: The purpose of this study was to evaluate the levels of zinc (Zn), copper (Cu), iron (Fe) and zinc/ cop-per ratio in the serum of patients with cutaneous leishmaniasis in Qom Province, center of Iran."nMethods: Serum levels of zinc and copper were determined by flame atomic absorption spectrophotometer and serum iron concentration was measured by using an Auto Analyzer. The study group consisted of 60 patients with cutaneous leishmaniasis and the control group of 100 healthy volunteers from the same area who were not exposed to cutane-ous leishmaniasis."nResult: There were no statistically significant differences in age and body mass index between the two groups. Se-rum Zn (P< 0.001) and Fe (P< 0.05) levels were lower in patients with cutaneous leishmaniasis than the control group. We also found serum Cu concentration (P< 0.05) in the patient group was significantly higher than that of the control group. However, zinc/ copper ratio (P< 0.001) was lower in patients with cutaneous leishmaniasis than in the control group."nConclusion: Our data indicated that Zn/Cu ratio was significantly lower in patients with CL as compared to the con-trols. Earlier reports suggest that, this ratio imbalance could be a useful marker for immune dysfunction in leishma-niasis. There was also strong association of Zn, Cu and Fe with CL. It suggests the use of blood zinc, copper, iron concentration and the copper/zinc ratio (Zn/Cu), as a means for estimating the prognosis of CL. Keywords: Cutaneous leishmaniasis, Zn, Cu, Fe. Zn/Cu ratio, Iran
光质对桔梗根生长及有效成分积累的影响
Effects of Light Quality on the Growth and Effective Component Accumulation of Platycodon grandiflorus

吴珍,潘婷婷,王新军
- , 2018, DOI: 10.3969/j.issn.1001-7461.2018.02.21
Abstract: 以桔梗为材料,用蓝、紫、黄、绿、红滤光膜模拟不同光质处理桔梗,以自然光下生长的桔梗为对照,测定不同光质对商洛桔梗根的生长、皂苷含量、多糖含量以及Cu/Zn比值的影响。结果表明,与对照相比,红膜处理显著促进了根的伸长和侧根的形成,也有利于根的增粗和单根鲜重的增加,但是未达显著水平,红膜处理也有利于桔梗多糖的积累和皂苷积累;紫膜显著降低了桔梗皂苷的含量;蓝光虽然抑制了桔梗根的生长及鲜重的的增加,却有利于桔梗多糖积累;绿膜能显著提高Zn含量并降低根中Cu/Zn比值;黄膜虽能增加桔梗多糖的含量,却显著抑制了桔梗根的生长,显著提高桔梗的Cu/Zn比值,对桔梗根生长和品质形成不利。基于上述结果,生产中在桔梗根部生长较快时期用红色滤膜处理,即可增加产量又有利于桔梗多糖和皂苷的积累,而在桔梗生长后期初生代谢变缓的时期可以用蓝或绿色滤膜处理,可促进有机物转化为次生代谢产物,增加多糖的含量、降低Cu/Zn比值,从而提高桔梗产量和品质。
In this study,seedlings of Platycodon grandiflorus were planted under blue,violet,yellow,green and red color films,and natural light was used as control.Relative parameters,including root growth,saponin content,polysaccharide content and Cu/Zn ratio,were measured under different light quality.The results showed that comparing with the control,red films could promote seedling growth,which was conducive to the accumulation of polysaccharides and saponins.Violet light reduced saponin content significantly.Blue film was favorable for the polysaccharide accumulation,but the growth was inhibited.Green film improved the Zn content significantly and reduced the Cu/Zn ratio.Yellow film increased the content of polysaccharide,but improved the Cu/Zn ratio significantly,which was detrimental to the growth and quality of P.grandiflorus.Based on the above results,during the cultivation,it was recommended that P.grandiflorus would be planted under red film in root rapid growth period to promote the accumulation of polysaccharides and saponins.And in the later period of the growth,it would be better to be treated under blue or green films in order to promote the transformation of organic compounds into secondary metabolites,increase the content of polysaccharide,and decrease the ratio of Cu/Zn.Finally,the measures could improve the yield and quality of P.grandiflorus
Zinc y cobre séricos y la relación zinc/cobre en un grupo de ni os del sur de Valencia, Venezuela Zinc and copper in serum and zinc/copper ratio in a group of children from South Valencia, Venezuela
Edgar Acosta García,Elissa Galdona,María Adela Barón,María Concepción Páez
Acta bioqu?-mica cl?-nica latinoamericana , 2010,
Abstract: Se estudiaron las concentraciones séricas de zinc (Zn) y cobre (Cu), y la relación zinc/cobre (Zn/Cu) en 82 ni os aparentemente sanos de 4 a 14 a os de la ciudad de Valencia, Venezuela. Las concentraciones de Zn y Cu se determinaron por espectrofotometría de absorción atómica y el estado nutricional con los índices Peso/Talla, Talla/Edad e índice de Masa Corporal. Los resultados de Zn (μg/dL), Cu (μg/dL) y la relación Zn/Cu fueron expresados en media±desviación estándar: (84,2±15,9), (125,4±24,8) y (0,69±0,18) respectivamente, sin diferencia significativa entre ni os y ni as. La concentración de Cu correlacionó significativamente con la edad, siendo más baja en los ni os mayores. La hipozincemia fue de 15,9% siendo las ni as (18,6%) más afectadas que los ni os (13,2%) y por grupos de edad, los =11 a os presentaron la mayor hipozincemia (22,2%). No se encontró hipocupremia. No hubo asociación entre las concentraciones de Zn, Cu y la relación Zn/Cu con el estado nutricional. Los resultados encontrados difieren de los hallados en otras investigaciones y la hipozincemia afectó más a las ni as y a los ni os de mayor edad, mientras que no hubo hipocupremia en la muestra evaluada ni asociación entre las concentraciones de Zn, Cu y la relación Zn/Cu con el estado nutricional. Sera levels of zinc (Zn), copper (Cu) and the ratlo zlnc/copper (Zn/Cu) were analyzed In 82 apparently healthy chlloren between 4 and 14 years of age from Valencia Clty Venezuela. The Zn (μg/dL) and Cu (μg/dL) were determlned by fíame atomic absorption spectrometry and the nutritional state was evaluated wlth Welght/Helght, Helght/Age and Body Mass index. Zn, Cu and the Zn/Cu were (Deflned by average±standard devlatlon): (84.2±15.9), (125.4 ± 24.8) and (0.69±0.18) respectlvely There was no significant diffference by gender. There was inverse and significant correlation between Cu and age. Zn deficiencies were 15.9%, and they were hígher in girls (18.6%) than in boys (13.2%). Children =11 years of age had 22.2% Zn deficiencies. There were no Cu deficiencies. No significant association was found between Zn, Cu, Zn/Cu and the nutrítíonai state. Zn, Cu ana Zn/Cu were different from those found in other investigations and hipozincemia in children affected mostiy femaies and those of oider age.
Distribution of Zn and Cu in rock,soil and navel orange tree system in Zigui County, Hubei Province
湖北秭归地区岩石-土壤-脐橙树系统中铜 、锌元素的分布特征

LI Xue-Biao,
李学彪

中国生态农业学报 , 2007,
Abstract: 对湖北秭归地区脐橙生态区岩石-土壤-脐橙树系统中Cu、Zn元素分布特征的研究表明:脐橙果实中Cu和Zn的含量变化与母岩中的变化趋势相反,与土壤中Cu和Zn的变化趋势相关性不明显;系统中Cu和Zn的分布普遍存在偶数规律,且Zn/Cu有岩石→土壤→脐橙果实→干逐渐增大的变化特征,Zn和Cu元素在脐橙植物系统中生物地球化学循环发生了分异,其方向是喜Zn厌Cu。不同地区脐橙果实中Cu和Zn元素的生物富集系数之间存在明显线性关系,其回归方程为:Zn=0.006 0.024×Cu(R=0.96)。
Molecular Basis of Hypertension: A Systematic Review on the Role of Metal Ions for Increase Prevalence of Hypertension in India  [PDF]
Kshetrimayum Birla Singh
Journal of Biosciences and Medicines (JBM) , 2016, DOI: 10.4236/jbm.2016.47002
Abstract: Metal ions played critical role in regulation of hypertension (HT) or blood pressure (BP). The physiological roles of metals commonly present in the diet in the etiology of HT need to be reviewed as recent survey on the metal status in the various vegetable and meat food stuffs commonly consumed by living population in India revealed an imbalance in its level. Higher levels of zinc (Zn) in diet is observed to increase the BP by various mechanisms including oxidative stress through decreased activity of superoxide dismutase (SOD) enzyme, increasing levels of angiotensin converting enzyme (ACE) and aldosterone and by causing acidification due to change in the levels of H+, Na+, K+ and Ca2+ ions in the blood. High level of copper (Cu) and low level of magnesium (Mg) and manganese (Mn) in the blood is also associated with HT through various mechanisms like elevation of chronic inflammation, accelerating Na+ pump of cell membrane and by disturbing lipid metabolism in the body. An epidemiological study conducted in the population of Manipur, India consuming Zn rich diet reveals significant disparities in distribution of the metals in the blood of the hypertensive (HTS) patients as compared to the normotensives (NT) control and thus indicates that the change in body metal homeostasis may be a triggering factor for the development of HT in this population and corroborate the reports of published literatures. The role of the metals variations in the body and their possible involvement in HT is reviewed and discussed in this paper.
不同品种水稻糙米对Cd Cu Zn积累特性的研究
农业环境科学学报 , 2010,
Abstract: 以酸性矿山废水污染的含有多种重金属的农田土壤为供试土壤,通过盆栽实验,研究不同水稻品种,不同类型、不同遗传背景水稻糙米重金属Cd、Cu、Zn的积累差异。结果表明,供试水稻糙米Cd含量为0.006~0.092mg·kg-1,最高值和最低值相差15倍;Cu含量为6.712~27.117mg·kg-1,最高值和最低值相差4倍;Zn含量为28.390~43.296mg·kg-1,最高值和最低值相差不到1倍。常规稻和杂交稻糙米的Cd、Cu、Zn含量差异不明显。三系杂交稻的糙米Cd、Cu含量极显著高于二系杂交稻,而二系杂交稻糙米中Zn含量则显著高于三系杂交稻。不同遗传背景水稻品种糙米Cd、Cu、Zn含量也存在明显差异。相关分析结果表明,糙米中Cu、Cd含量间呈极显著正相关,Cu、Zn含量之间存在显著负相关,而Cd、Zn含量间的相关性不明显。
Synthesis and Determination of Stability Constants of a New Bis-1,2,4-triazole Ligand for Complexation with Zinc(II), Copper(II) and Nickel(II) in Acetonitrile  [PDF]
Reza Emamali Sabzi, Abbas Nikoo, Yaser Nikzad, Morteza Bahram, Karim Akbari, Naser Samadi
American Journal of Analytical Chemistry (AJAC) , 2012, DOI: 10.4236/ajac.2012.36057
Abstract: In this work, the synthesis and complexation properties of a new compound, 1,3-bis[5-(2-hydroxyphenyl)-4-phenyl- 1,2,4-triazole-3-yl-thio]propane (BTP), towards certain transition metal ions, (M(II) where M = Zn, Cu, Ni) in acetonitrile is reported. A hard-modeling strategy was applied to UV-Visible spectroscopy data obtained from monitoring the reaction between BTP and the selected metal ions to determine the concentration profiles of each species and the corresponding stability constant(s) of the complex(es). The stability constants of complexes are always defined in terms of their free metal, free ligand and complexed forms. These constants are influenced by parameters such as the type of metal, ligand, counterion or solvent. In this study, the formation constants of the complexes were determined for the synthesized ligand with several metallic cations in acetonitrile solvent by UV-Vis spectrophotometry.
Efficient Electrochemical Removal of Ammonia with Various Cathodes and Ti/RuO2-Pt Anode  [PDF]
Yaning Wang, Xu Guo, Jinglu Li, Yingnan Yang, Zhongfang Lei, Zhenya Zhang
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.24036
Abstract: Electrochemical oxidation of ammonia was studied with an objective to enhance the selectivity of ammonia to nitrogen gas and to remove the by-products in an undivided electrochemical cell, in which various cathodes and Ti/RuO 2-Pt anode were assembled. In the present study, anodic oxidation of ammonia and cathodic reduction of by-products were achieved, especially with Cu/Zn as cathode. In the presence of 1.0 g/L NaCl the ammonia-N decreased from 100.0 to 0 after 120 min electrolysis at current density of 30 mA/cm2, and no nitrite was detected in the treated solution. The lowest amount of nitrate was formed with Cu/Zn as cathode during electrolysis due to its high reduction ability. Initial pH range from 7 and 9 and uncontrolled temperature were favorable for electrochemical ammonia oxidation and the ammonia oxidation rates with Cu/Zn cathode was higher than that with Ti and Fe cathode. The reduction rate increased with increasing current density in the range of 5 - 50 mA/cm2. As ammonia could be completely removed by the simultaneous oxidation and reduction in this study, it is suitable for deep treatment of ammonia polluted water.
Effect of Sintering Time on the Structural, Magnetic and Electrical Transport Properties of Mg0.35Cu0.20Zn0.45Fe1.94O4 Ferrites  [PDF]
M. Aliuzzaman, M. Manjurul Haque, M. Jannatul Ferdous, S. Manjura Hoque, M. Abdul Hakim
World Journal of Condensed Matter Physics (WJCMP) , 2014, DOI: 10.4236/wjcmp.2014.41003
Abstract:

Spinel-type Mg0.35Cu0.20Zn0.45Fe1.94O4 ferrites were synthesized by using the solid-state reaction technique. The XRD patterns of the sintered samples indicated the formation of single-phase cubic spinel structure. The apparent density of the sample is found to increase whereas porosity decreases with the increase in sintering time. The grain growth of the samples is enhanced with the increase in sintering time which is attributed to the liquid phase due to CuO during sintering. The initial permeability of the ferrite is found to increase with the increase in sintering time but the resonance frequency shifts towards the lower frequency. This increase in permeability is correlated to the increase of density and the grain size of the sample. The resistivity of the samples decreases with 103/T ensuring the semiconducting nature of the samples. Room temperature DC resistivity and activation energy of the samples decrease what is attributed to the increased Fe2+ ions content with the increase in sintering time. The dielectric constant (e) of the samples decreases with increasing frequency whereas e

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