原子吸收光谱法测定瑞舒伐他汀治疗组兔肝脏中的微量元素

探讨实验性动脉粥样硬化兔肝脏组织中Zn、Fe、Cu、Mn、Cr、Pb和Cd含量的变化.高脂饮食复制兔动脉粥样硬化模型,然后给予瑞舒伐他汀建立治疗组模型,获取肝脏,用硝酸、过氧化氢混合液微波消解样品,采用原子吸收光谱法测定肝脏组织中Zn、Fe、Cu、Mn、Cr、Pb和Cd的含量.高脂组肝脏组织Zn、Fe、Cu、Mn和Cr、Pb、Cd含量分别为86.09、277.1、11.07、5.366mg/kg和115.2、286.0、210.5μg/kg,治疗组肝脏组织Zn、Fe、Cu、Mn和Cr、Pb、Cd含量分别为102.1、239.3、9.442、5.911mg/kg和85.52、288.1、216.3μg/kg.经过瑞舒伐他汀治疗后,Zn、Mn含量升高,Fe、Cu、Cr含量下降,Pb和Cd基本不变.     

绒柄牛肝菌微量元素含量测定及相关性分析

采用ICP-AES法测定了绒柄牛肝菌中11种微量元素含量.结果显示,Mg和Fe含量最高(＞100mg·kg-1),Mn,Zn,Cu含量较高(＞10 mg·kg-1),Cr,Pb,Ni,Cd,As含量较低(＞0.1 mg·kg-1),Hg含最最低(＜0.1 mg·kg-1).所测定的元素中,Zn和Cu存在显著正相关(P＜...     

FAAS法测定苦杏仁和甜杏仁中的13种金属元素

采用硝酸、高氯酸(V/V=4/1)常压微沸条件下消解苦杏仁和甜杏仁样品,火焰原子吸收法测定苦杏仁和甜杏仁中的金属元素:Mn、Ca、K、Mg、Na、Zn、Cu、Fe、Co、Cd、Ni、Pb、Cr的含量,研究了测定不同元素仪器的最佳工作条件、方法的准确度和精密度.结果表明:苦杏仁中Mn、Ca、K、Mg、Na、Zn、Cu、Fe、Co、Cd、Ni和Pb的含量分别为11.756,1614.167,5153.191,238.478,97.668,274.836,16.844,546.316,9.952,3.474,5.979,2.143μg·g-1Cr未检出,方法回收率(n=9)在97.32%-102.57%之间,RSD(n=9)在0.14%-2.22%之间;甜杏仁中Mn、Ca、K、Mg、Ni、Zn、Cu、Fe、Co、Cd、Ni和Pb的含量分别为6.622,1937.503,8663.824,216.956,257.546,77.961,12.483,372.183,7.990,3.666,2.268,3.214μg·g-1Cr未检出,方法回收率(n=9)在97.23%-102.43%之间,RSD(n=9)在0.47%-2.14%之间.该法快速,简单,准确度和精密度均较高,能达到分析要求.     

应用ICP-MS和AFS测定含磷肥料中重金属含量

肥料的投入是土壤重金属累积的重要污染来源之一,研究肥料中重金属的含量对于农产品的安全生产意义重大。为了调查我国市售含磷肥料中重金属含量状况,在部分省份农资销售点采集了159个含磷肥料样品,包括国产和进口的。应用ICP-MS和AFS分析测定了含磷肥料中Cd,Cu,Zn,Cr,Pb,Ni,As和Hg八种重金属元素的含量。结果表明,采集的含磷肥料中含有一定量的重金属元素,Cd,Cu,Zn,Cr,Pb,Ni,As和Hg的均值分别为0.77,35.6,102.7,24.1,16.6,15.4,19.4和0.08 mg·kg-1肥料。以P₂O₅为基础计算,Cd,Cu,Zn,Cr,Pb,Ni,As和Hg的均值分别为4.48,258.4,767.4,190.0,151.3,134.5,155.8和8.79 mg·kg-1 P₂O₅。所有检测样品中,只有一个磷酸一铵样品中As超标,一个进口的磷酸二铵样品中Cd超标,其余样品中重金属含量都符合肥料中砷、镉、铅、铬、汞生态指标要求(GB/T 23349-2009)。分析了13个进口肥料样品中重金属含量,重金属Cd的含量范围为0.02～27.2 mg·kg-1肥料,均值和中位值分别为3.20和0.41 mg·kg-1肥料。进口肥料中Cu,Cr和Hg高于国产肥料,均值分别为39.4,26.6和0.47 mg·kg-1肥料。     

FAAS法测定不同产地油菜花粉中13种金属元素含量

采用先灰化、再经硝酸-高氯酸(V∶V=4∶1)常压微沸条件下消化油菜花粉样品,应用火焰原子吸收法测定不同产地油菜花粉中的金属元素K,Na,Ca,Mg,Fe,Co,Ni,Cu,Zn,Mn,Cd,Cr和Pb的含量。研究了测定不同元素的仪器最佳工作条件,并作了方法的准确性和精密度的考察。结果表明：山丹和景泰油菜花粉中K,Na,Ca,Mg,Fe,Cu,Zn和Mn的含量分别为4 248.00,75.77,312.10,856.61,599.53,8.78,27.82,22.54 μg·g-1和7 585.75,242.56,287.88,699.43,1 020.65,10.25,40.44,30.97 μg·g-1。Co,Ni,Cr,Cd和Pb未检出。加标回收率为95.22%～105.49%,相对标准差(n=9)为0.30% ～5.00%。测定方法简单易行,方便快捷。     

海洋底栖硅藻细胞中矿物元素含量分析

采用火焰原子吸收分光光度法对八种海洋底栖硅藻细胞中Mg,Fe,K,Ca,Mn,Zn,Cu,Ni,Pb,Cr,Cd共11种矿物元素的含量进行了测定。方法的相对标准偏差<6.85%,相关系数为0.998 9～0.9999,回收率95%～103%。结果表明,所筛选的八种海洋底栖硅藻中含有较丰富的常量元素和微量元素,常量元素Mg,Fe,K,Ca的含量为10-1～102 mg·g-1数量级,微量元素Mn,Zn,Cu,Ni的含量为10-3～10-1 mg·g-1数量级。其含量依次为Mg>Fe>Ca>K>Mn>Zn,Cu和Ni的含量极少,有害重金属元素Pb,Cr和Cd含量极微。Mg, K和Mn含量最高的是半裸舟形藻,分别为(17.224 0±0.030 2)mg·g-1 SD,(1.788 5±0.093 9)mg·g-1 SD和(0.225 3±0.001 1)mg·g-1SD。Fe(4.231 4±0.030 9)mg·g-1 SD), Zn(0.116 7±0.002 9)mg·g-1 SD), Cu(0.022 7±0.000 7)mg·g-1 SD)和Ni(0.014 7±0.000 5)mg·g-1 SD)含量最高的是双尖菱板藻细头变种,而菱形藻细胞中Ca(6.353 7±0.041 2)mg·g-1 SD含量最高。     

火焰原子吸收法测定栽培小茴香中13种金属元素含量

采用先灰化、再用硝酸-高氯酸(φ 4∶1)常压微沸条件下消解小茴香样品,应用火焰原子吸收法测定栽培小茴香中的金属元素Na,K,Mg,Ca,Cu,Zn,Mn,Fe,Co,Ni,Cd,Cr和Pb含量,研究了测定不同元素的仪器最佳工作条件,并作了方法的准确性和精密度考察。结果表明,栽培小茴香中Na,K,Mg,Ca,Mn,Fe,Cu,Zn和Pb含量分别为1 508.7,27 653.0,2 036.0,4 848.1,24.8,323.5,15.2,23.7和10.8 μg·g-1;Ni,Co,Cd和Cr未检出。方法的加标回收率为97.45%～102.50%, 相对标准偏差(n=9)为0.34%～2.77%。测定方法简单易行,方便快捷,结果令人满意。     

ICP-AES测定7种花茶中8种微量元素的含量和溶出率

采用微波消解样品,电感耦合等离子体-原子发射光谱法测定了金银花、玫瑰茄、玉蝴蝶、仙人草、菊花、薰衣草、腊梅等7种花茶中Fe、Mn、Cu、Zn、Ni、Cr、Cd和Pb等元素的含量及其溶出率。结果表明,花茶中Fe含量较高,重金属Cr、Cd和Pb含量普遍较低,花茶中Cu、Zn、Mn和Ni的溶出率相对较高,Fe的溶出率较低,有害的重金属Cd、Pb和Cr的溶出率很低,此测定结果可为探讨花茶的保健作用与微量元素的相关性提供科学数据。     

火焰原子吸收光谱法测定芋头中10种金属元素

采用干法分解样品,应用火焰原子吸收光谱法测定了芋头中K、Ca、Mg、Cu、Zn、Fe、Mn、Cd、Cr、Pb金属元素的含量.研究了测定不同元素的仪器最佳工作条件,并做了方法的准确性和精密度考察.结果表明,芋头中含有丰富的K、Ca、Mg、Cu、Zn、Fe、Mn,Cr及有害元素Pb未检出,Cd含量符合食品卫生标准.该法加标...     

FAAS法测定地石榴中12种金属元素

采用浓硝酸:高氯酸(4 1)常压微沸条件下消解地石榴样品,应用火焰原子吸收光谱法测定了地石榴中的金属元素Na、K、Mg、ca、Fe、Co、Ni、Cu、Zn、Mn、Cd、Pb含量,研究了测定不同元素的仪器最佳工作条件、方法的准确性和精密度.结果表明,地石榴中Na、K、Mg、Ca、Fe、Cu、Zn、Mn、Cd含量分别为33.88,3444.54,328.54,1924.76,56.65.1.88,2.97.1.59,2.99mg·100g-1,Co、Ni、Pb未检出.方法的加标回收率为98.16%-103.6%.相对标准偏差(n=9)为0.21%-2.22%.测定方法简单易行,方便快捷,结果令人满意.     

Group fields,gravity, and angular momentum

The angular momentum properties of different homotopic sectors of a group field are examined. The results are applied to gravity, which is essentially a group field, and it is shown that the usual gravity kinks do not have angular momentum 1/2.Work supported in part by the National Science Foundation Grant No. PHY800-7921.     

Trace Extensions,Determinant Bundles,and Gauge Group Cocycles

We study the geometry of determinant line bundles associated with Dirac operators on compact odd-dimensional manifolds. Physically, these arise as (local) vacuum line bundles in quantum gauge theory. We give a simplified derivation of the commutator anomaly formula using a construction based on noncyclic trace extensions and associated nonmultiplicative renormalized determinants.     

w*-Algebra, Poincare Group, and Quantum Kinetic Theory

The w*-algebra in the standard representation isused to define a vector space for representations of Liealgebras. The Poincare group is studied as inthermofield dynamics (TFD) with the result that thenotion of phase space is introduced from the structureof the Poincare-Lie algebra. The basis of quantum-fieldkinetic theory is analyzed in association with TFD. Asa particular case, the Juttner distribution is derived.     

Baxter-Bazhanox Model,Frenkel-Moore Equation and the Braid Group

In this paper the three-dimensional vertex model is given, which is the duality of the threedimensional Baxter-Bazhanov (BE) model. The braid group corresponding to Frenkel-Moore equation is constructed and the transformations R, I are found. These maps act on the group and denote the rotations of the braids through the angles π about some special axes. The weight function of another three-dimensional .vertex model related the 3D laettice integrable model proposed by Boos, Mangazeev, Sergeev and Stroganov is presented also, which can be interpreted as the deformation of the vertex model corresponding to the BB model.     

Quantum Walks,Weyl Equation and the Lorentz Group

Quantum cellular automata and quantum walks provide a framework for the foundations of quantum field theory, since the equations of motion of free relativistic quantum fields can be derived as the small wave-vector limit of quantum automata and walks starting from very general principles. The intrinsic discreteness of this framework is reconciled with the continuous Lorentz symmetry by reformulating the notion of inertial reference frame in terms of the constants of motion of the quantum walk dynamics. In particular, among the symmetries of the quantum walk which recovers the Weyl equation—the so called Weyl walk—one finds a non linear realisation of the Poincaré group, which recovers the usual linear representation in the small wave-vector limit. In this paper we characterise the full symmetry group of the Weyl walk which is shown to be a non linear realization of a group which is the semidirect product of the Poincaré group and the group of dilations.     

Group theory,Markov chains,and excluded volume effect in polymers

A restricted walk of orderr on a lattice is defined as a random walk in which polygons withr vertices or less are excluded. A study of restricted walks for increasingr provides an understanding of how the transition in properties is effected from random to self-avoiding walks which is important in our understanding of the excluded volume effect in polymers and in the study of many other problems. Here the properties of restricted walks are studied by the transition matrix method based on the theory of Markov chains. A group theoretical method is used to reduce the transition matrix governing the walk in a systematic manner and to classify the eigenvalues of the transition matrix according to the various representations of the appropriate group. It is shown that only those eigenvalues corresponding to two particular representations of the group contribute to the correlations among the steps of the walk. The distributions of eigenvalues for walks of various ordersr on the two-dimensional triangular lattice and the three-dimensional face-centered cubic lattice are presented, and they are shown to have some remarkable features.     

Geometrical Aspects of Skyrmions, Reflection Group, and the Internal Symmetry of Hadrons

The topological aspects of skyrmions are studied and it is shown that hadronscan be viewed as composite states of baby skyrmions when the internal symmetrySU(3) is generated from reflection. It is shown that in an anisotropic space aparticle can move with l = 1/2 with a specific l _x value, and a bosonic constituentmoving with l = 1/2 will appear as a baby skyrmion and a fermionic constituentwill appear as if a spin carrier is attached to a baby skyrmion. The associatedmagnetic field causes a strong statistical attraction which helps to form the boundstate of such constituents. The doublet of such particles having opposite l _x valuesform a conformal spinor when each member behaves as a Cartan semispinor.The conformal reflection then helps us to generate the internal SU(3) symmetry,which splits as SU(3) SU(2) × U(1), giving rise to the hadronic spectra. Thestrong interaction involves a composite cluster in such a bound system whenrearrangement of the constituents takes place preserving the direction vectors,and an elementary constituent can take part in a weak interaction, causing parityviolation. These features help us to consider elementary constituents as knownparticles like leptons.     

Qualitative behaviour of Renormalization Group Equation and non-associative,finite algebras

We analyse the RNGE for a field theory model from the algebraic point of view. The class of theories with two coupling constants is analysed in the lowest order of perturbation theory.     

One-Dimensional Group III-Nitrides: Growth,Properties, and Applications in Nanosensing and Nano-Optoelectronics

This review will give a brief introduction to the growth and characterization methods of both binary and ternary compounds, in particular those exhibiting one-dimensionality, of the family to orient the readers about the material system to be discussed. A section will deal with the size and shape selection in group III nitride nanomaterials with a stress on intriguing morphologies such as nanowires, nanotips, and nanobelts. Complex structures, such as hierarchical and core-shell structures, will be introduced. Optical, electrical, and mechanical property, such as hardness, will be discussed in a greater detail, distinguishing the bulk from the nano wherever possible. Available models of electrical conduction and photoconduction in nanomaterials and their dependence on the actual size of the objects will be presented and compared. Optical properties of ensemble and single nanostructures, wherever possible, will be addressed in detail. The section on application will focus mainly on the sensor applications, including chemical sensors, gas sensors, and biosensors, with a thrust on DNA sensing. Because popular applications such as light-emitting diodes (LEDs) and field effect transistors (FETs) have already been reviewed extensively, only major contributions to this field—for example, nano-LEDs—will be discussed. Some recent advances in the group III-nitride materials family will be presented that will indicate future directions of research in this area.