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Determination of Selected Heavy Metals and Human Health Risk Assessment in Fishes from Kiri Dam and River Gongola, Northeastern Nigeria 尼日利亚东北部基里大坝和贡戈拉河鱼类中选定重金属的测定及人体健康风险评价
Pub Date : 2017-01-01 DOI: 10.4172/2161-0398.1000229
Orosun Mm, P. Tchokossa, R. Orosun, Akinyose Fc, S. Ige, O. Vo
Atomic Absorption Spectrometry was used to analyze the concentrations of heavy metals (Pb, Cd, Cr, Fe and As) in the Catfish and Tilapia from Kiri Dam and River Gongola, Northeastern Nigeria. Analysis of these selected heavy metals in the fish samples reveals that these selected heavy metals are higher in Catfish than Tilapia irrespective of the location. Assessment of the health risks due to consumption of these fishes suggests that both fishermen and the general populace are not subjected to a significant potential health risk. The results of this study regarding metal contents in fishes from the study areas also suggest that the consumption of catfish and tilapia from the study area is not free of risks. And that the complex THQ and TTHQ parameters used in health risk assessment of heavy metals provides a better image than using only a simple parameter like the content of the metals in the samples.
采用原子吸收光谱法分析了尼日利亚东北部基里大坝和贡戈拉河的鲶鱼和罗非鱼中重金属(Pb、Cd、Cr、Fe和As)的浓度。对鱼类样本中这些选定重金属的分析显示,无论在哪个地点,鲶鱼的这些选定重金属含量都高于罗非鱼。对食用这些鱼类造成的健康风险的评估表明,渔民和一般民众都不会受到重大的潜在健康风险。这项关于研究区域鱼类中金属含量的研究结果也表明,食用研究区域的鲶鱼和罗非鱼并非没有风险。在重金属健康风险评估中使用的复杂THQ和TTHQ参数比仅使用样品中金属含量等简单参数提供了更好的图像。
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引用次数: 22
Annealing Temperature Effect on the Physical Properties of Titanium Oxide Thin Films Prepared by the Sol-Gel Method 退火温度对溶胶-凝胶法制备氧化钛薄膜物理性能的影响
Pub Date : 2017-01-01 DOI: 10.4172/2161-0398.1000257
Sahbeni K, Sta I, Jlassi M, Kandyla M, Hajji M, Kompitsas M, Dimassi W
In this work, the low-cost sol–gel, spin-coating technique was used to grow TiO2 thin films on silicon substrates. The influence of annealing temperature on the structural, morphological, and optical properties of TiO2 films is investigated. The structural properties of the TiO2 films are investigated by Raman and Fourier transform infrared (FTIR) Spectroscopy. Morphological properties are studied by Atomic Force Microscopy (AFM). The optical properties are examined by photoluminescence (PL) and ultraviolet-visible (UV-vis) spectroscopy.
本研究采用低成本的溶胶-凝胶、旋涂技术在硅衬底上生长TiO2薄膜。研究了退火温度对TiO2薄膜结构、形貌和光学性能的影响。利用拉曼光谱和傅里叶红外光谱研究了TiO2薄膜的结构特性。用原子力显微镜(AFM)研究了材料的形态特性。通过光致发光(PL)和紫外-可见(UV-vis)光谱对其光学性能进行了检测。
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引用次数: 8
Stability Analysis of the Jacobian Elliptic Solutions for the Twisted Peyrard-Bishop-Dauxois Model with Solvent Interaction 具有溶剂相互作用的扭曲Peyrard-Bishop-Dauxois模型Jacobian椭圆解的稳定性分析
Pub Date : 2017-01-01 DOI: 10.4172/2161-0398.1000248
D. Toko, A. Mohamadou, O. Dafounansou, C. Tabi, T. Kofané
We consider a twisted Peyrard-Bishop-Dauxois (PBD) model and construct the exact analytical solutions, which can describe the propagation of solitary waves by invoking a discrete Jacobian elliptic function method. These solutions include the Jacobian periodic solution as well as bubble solitons. Through the Fourier series approach, we have found that the DNA dynamics is governed by a modified discrete nonlinear Schrodinger (MDNLS) equation. A detailed analysis of the role of the twisted angle in the process of bio energy localization is presented in the form of coherent localized breather modes in a PBD model. A linear stability analysis is performed and we obtain that the stability of the solutions also depends on the twisted angle.
考虑一个扭曲的Peyrard-Bishop-Dauxois (PBD)模型,利用离散雅可比椭圆函数方法构造了描述孤立波传播的精确解析解。这些解包括雅可比周期解和泡孤子。通过傅里叶级数方法,我们发现DNA动力学是由一个修正的离散非线性薛定谔方程(MDNLS)控制的。在PBD模型中,以相干局域呼吸模式的形式详细分析了扭曲角在生物能局域化过程中的作用。进行了线性稳定性分析,得到了解的稳定性也与扭转角有关。
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引用次数: 0
Bubble Formation in Helicoidal DNA Molecules 螺旋DNA分子中的气泡形成
Pub Date : 2016-11-06 DOI: 10.4172/2161-0398.1000230
Conrad Bertr, Tabi
Wave interaction is addressed the framework of the helicoidal Peyrard-Bishop model of DNA. The model is first reduced to a set of coupled nonlinear Schrodinger equations via the multiple scale expansion. Modulational instability analysis shows that multi-breather trains exist in large regions of instability, while trains of one-humped breathers are observed for the single excitation mode. Analytical solutions are proposed, where single modes are proposed to described DNA respiration and coupled waves rather describe the bubbles observed in experiments. These bubbles are shown to be more effective under weak helicoidal coupling. The process of strand separation is also discussed. PACS number(s): 87.14.E-, 87.15.H-, 05.45.Yv, 05.45.-a
波的相互作用是解决了DNA的螺旋佩拉德-毕晓普模型的框架。首先通过多尺度展开将模型简化为一组耦合的非线性薛定谔方程。调制不稳定性分析表明,在大的不稳定区域存在多呼吸机序列,而在单激励模式下存在单峰呼吸机序列。提出了解析解,其中提出了单模式来描述DNA呼吸和耦合波而不是描述实验中观察到的气泡。这些气泡在弱螺旋耦合下更有效。还讨论了链分离的过程。PACS数值:87.14。E-, 87.15.h -, 05.45。青年志愿,05.45.-a
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引用次数: 1
Natural Bond Orbital Analysis of [Fe(H 2O)6]2+/3+ and ( ) ( )n + 2 6 2 2 Zn H O H O ; N=0-4 [Fe(h2o)6]2+/3+和()()n + 2 6 2 2 Zn H O H O的自然键轨道分析N = 0 - 4
Pub Date : 2016-09-01 DOI: 10.4172/2161-0398.1000231
N. Pokhrel, H. P. Lamichhane
Nature of delocalization of the electrons from the ligands to metals in the first coordination sphere of the highspin complexes [Fe(H2O)6]2+/3+ and [Zn(H2O)6]2+ are computationally studied using density functional theory. Among the studied complexes, natural charge transfer from H2O ligands to metal ion is found to be maximum of 1.556e in [Fe(H2O)6]2+ and minimum of 0.621e in [Zn(H2O)6]2+. On the other hand, the interaction between the lone pairs of oxygen with metal ion is found to be stronger in [Zn(H2O)6]2+ than in the complexes with second coordination sphere. Number of such strong interactions in the first coordination sphere are found to be decreased with the addition of H2O ligands in the second coordination sphere.
利用密度泛函理论计算研究了高自旋配合物[Fe(H2O)6]2+/3+和[Zn(H2O)6]2+在第一配位球中电子从配体到金属的离域性质。在所研究的配合物中,从H2O配体到金属离子的自然电荷转移在[Fe(H2O)6]2+中最大,为1.556e,在[Zn(H2O)6]2+中最小,为0.621e。另一方面,在[Zn(H2O)6]2+中,孤对氧与金属离子之间的相互作用比在具有第二配位球的配合物中更强。在第二配位球中加入H2O配体后,第一个配位球中这种强相互作用的数量减少。
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引用次数: 0
Basic Things are Simple 基本的东西很简单
Pub Date : 2016-08-26 DOI: 10.4172/2161-0398.1000223
M. Deans
During a primordial ice age, ice crystallized in pools of liquid nitrogen on its poles, forming diamond-like crystals creating order from chaos. Models made from matchsticks and Plastacine™ or criss-crossed strips of cardboard stapled together are surprisingly strong (Figures 1 and 2). Random temperature fluctuations drove a ferroelectric phase transition at 72 degrees Kelvin, accommodating water molecules’ irregular tetrahedral shape and releasing latent energy as infrared laser light, ice light with wavelength λ ~ 4 μ. When such light was tried for de-icing aircraft wings, it was reflected. Likewise, it would have been reflected by surface ice and ice in clouds, just as Marconi’s first trans-Atlantic radio signals were. Lightning created nucleotides in the warm tropical waters Charles Darwin described, they absorbed ice light which photophosphorylated them. Reflection polarized the light, so only left or right-handed, chiral nucleotides were chosen (remember the thalidomide disaster!) and a noodle soup of chiral DNA emerged (Figure 3).
在原始冰河时期,冰在两极的液氮池中结晶,形成钻石状的晶体,从混乱中创造出秩序。由火柴棒和Plastacine™或交叉纸板条钉在一起制成的模型强度惊人(图1和2)。随机温度波动驱动了72开尔文的铁电相变,容纳了不规则的四面体形状的水分子,并释放出波长为λ ~ 4 μ的红外激光冰光的潜在能量。当这种光被用于飞机机翼除冰时,它被反射了。同样,它也会被地表冰和云层中的冰反射,就像马可尼的第一个跨大西洋无线电信号一样。达尔文曾描述过,闪电在温暖的热带水域中产生了核苷酸,它们吸收了冰的光,冰的光使它们磷酸化。反射使光偏光,因此只选择左手或右手的手性核苷酸(还记得沙利度胺的灾难吗?),手性DNA的面条汤就出现了(图3)。
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引用次数: 0
Finite element analysis and optimization of cylindrical resonant photoacoustic cell 圆柱形共振光声电池的有限元分析与优化
Pub Date : 2016-07-07 DOI: 10.4172/2161-0398.C1.016
Madhusoodanan Mannoor, Sangmo Kang
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引用次数: 14
The invention of high efficient blue LEDs and future lighting 高效蓝光led和未来照明的发明
Pub Date : 2016-07-06 DOI: 10.4172/2161-0398.C1.015
S. Nakamura
In 1970's and 80’s, an efficient blue and green lightemitting diodes (LED) were the last missing elements for solid-state display and lighting technologies due to the lack of suitable materials. By that time, III-nitride alloys was regarded the least possible candidate due to various "impossible" difficulties. However, a series of unexpected breakthroughs in 1990's totally changed people's view angle. Finally, the first high efficient blue LEDs were invented and commercialized at the same time of 1993. Nowadays, III-nitride-based LEDs have become the most widely used light source in many applications. The LED light bulbs are more than ten times efficient than incandescent bulb, and they last for 50 years! At their current adoption rates, by 2020, LEDs can reduce the world’s need for electricity by the equivalent of nearly 60 nuclear power plants. The history of the invention of blue LED and future lighting will be described.
在20世纪70年代和80年代,由于缺乏合适的材料,高效的蓝色和绿色发光二极管(LED)是固态显示和照明技术的最后缺失元素。到那时,由于各种“不可能”的困难,iii -氮化物合金被认为是最不可能的候选者。然而,20世纪90年代一系列意想不到的突破彻底改变了人们的视角。最后,第一批高效蓝光led在1993年发明并商业化。目前,氮化三氮基led已成为应用最广泛的光源。LED灯泡的效率是白炽灯泡的十倍以上,而且它们可以使用50年!按照目前的采用率,到2020年,led可以减少相当于近60座核电站的全球电力需求。蓝色LED的发明历史和未来的照明将被描述。
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引用次数: 1
Crystal Structure of Escherichia coli GroEL in Substrate and ADP Unloaded State 底物和ADP空载状态下大肠杆菌GroEL的晶体结构
Pub Date : 2016-06-27 DOI: 10.4172/2161-0398.1000222
S. Meena, A. Saxena
E. coli GroEL is a member of ATP-dependent chaperonin family and is involved in proper folding of cytosolic bacterial proteins. The E. coli GroEL contains 14 identical subunits of ~58.3 kD and arranged as two stalked rings. In current study, we have determined the X-ray structure of E. coli GroEL at 3.2-A resolution. The GroEL protein was coexpressed during recombinant M. tuberculosis DprE1 protein expression in E. coli and was co-purified with DprE1. The GroEL-DprE1 complex was crystallized and x-ray structure analysis yielded electron density for only GroEL protein only and no density for DrpE1 protein. Comparison of our GroEL structure with previous wild type GroEL (PDB-1XCK), DM-GroEL-(ATP)14 (PDB-1KP8) and GroEL- GroES-(ADP)7 (PDB-1PF9) structures have yielded the differences in (i) interactions between heptameric rings involved in allosteric signaling (ii) interactions within heptameric ring, (iii) H and I helices of apical domain involved in substrate binding and (iv) residues involved in signaling route. These results indicate that our GroEL structure may be in different state, which occurred during protein folding cycle after unloading the substrate and ADP.
大肠杆菌GroEL是atp依赖性伴侣蛋白家族的一员,参与胞质细菌蛋白的适当折叠。大肠杆菌GroEL含有14个相同的~58.3 kD亚基,排列成两个柄环。在目前的研究中,我们以3.2-A的分辨率确定了大肠杆菌GroEL的x射线结构。GroEL蛋白在重组结核分枝杆菌DprE1蛋白的大肠杆菌表达过程中共表达,并与DprE1共纯化。对GroEL- dpre1络合物进行结晶,x射线结构分析得到只有GroEL蛋白的电子密度,而DrpE1蛋白没有电子密度。将我们的GroEL结构与之前的野生型GroEL (PDB-1XCK)、DM-GroEL-(ATP)14 (PDB-1KP8)和GroEL- GroES-(ADP)7 (PDB-1PF9)结构进行比较,发现了以下方面的差异:(i)参与变构信号传递的七聚体环之间的相互作用(ii)七聚体环内部的相互作用,(iii)参与底物结合的尖结构域H和i螺旋以及参与信号传递途径的残基。这些结果表明,我们的GroEL结构可能在卸载底物和ADP后的蛋白质折叠周期中处于不同的状态。
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引用次数: 1
Synthesis and Characterization of Pectin Functionalized Bimetallic Silver/ Gold Nanoparticles for Photodynamic Applications 光动力用果胶功能化双金属银/金纳米粒子的合成与表征
Pub Date : 2016-06-20 DOI: 10.4172/2161-0398.1000221
G. Vanithakumari, S. Asha, T. Mathavan, Jothi Rajan Ma
Over the last decade, nanotechnologyhas become one of the most energetic evolving areas in research field. The astonishing properties of nanostructured materials are utilized in many field of research like energy, electronics and medicines. In this work, Functionalized silver, gold and Bimetallic Silver/Gold nanoparticles were prepared through chemical reduction in aqueous solution, following a method that was affable to the environment; this work will be stretching for photodynamic activities. AgNO3 and HAuCl4 were reduced using in-situ techniques in the presence of pectin and folic acid. Using the optical properties of metallic nanoparticles, surface plasmon resonance was determined from UV-Vis spectroscopy analysis, and the values obtained for silver and gold were approximately 350 nm and 543 nm in wavelength respectively. The absorption peaks of the surface plasmon band show a shift due to the size effect of the nanoparticles. The average hydrodynamic size and the size distribution of the synthesized nanoparticles were obtained through dynamic light scattering. To obtain a better understanding of the functionalization and conjugation conditions, High-resolution transmission electron microscopy has been used. The development of this process, which is compassionate for the environment, opens the possibility for many applications in the field of photodynamic applications.
在过去的十年中,纳米技术已成为研究领域中最具活力的发展领域之一。纳米结构材料的惊人特性被应用于许多研究领域,如能源、电子和医药。在这项工作中,通过在水溶液中化学还原制备了功能化银、金和双金属银/金纳米粒子,并采用了一种对环境友好的方法;这项工作将延伸到光动力学活动。采用原位还原技术,在果胶和叶酸的存在下还原AgNO3和HAuCl4。利用金属纳米粒子的光学性质,通过紫外可见光谱分析确定了表面等离子体共振,得到的银和金的波长分别约为350 nm和543 nm。由于纳米颗粒的尺寸效应,表面等离子体带的吸收峰发生了位移。通过动态光散射获得了合成纳米颗粒的平均水动力尺寸和尺寸分布。为了更好地了解功能化和共轭条件,使用了高分辨率透射电子显微镜。这一过程的发展,对环境的同情,为光动力学应用领域的许多应用开辟了可能性。
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引用次数: 14
期刊
Journal of physical chemistry & biophysics
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