Effect of Electrodeposition Frequency on Magnetic Properties of (Co0.97Al0.03)0.7Fe0.3 Nanowires

The magnetic properties of (Co0.97Al0.03)0.7Fe0.3 nanowires electrodeposited at different frequency of 50- 1000 Hz were studied. This nanowires were prepared by alternative current electrodeposition using porous anodic aluminum oxide as template. The results show that coercivity of samples slightly increased with increasing the frequency. Comparing the M–H hysteresis loops in different frequency shows that saturation magnetization (Ms) per unit area decreases with increasing the frequency. Magnetic properties were also investigated after annealing at 575 C. After annealing, a clear increase in coercivity was observed. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3534

Synthesis and Characterization of Co1-xSnx Magnetic Nanowires

High-density and uniform-sized Co1-xSnx alloy nanowires have been prepared electrochemically in anodic aluminum oxide (AAO) templates. This highly ordered arrays of nanowires have magnetic properties that affect by several agents including Sn concentration in structure of nanowires and annealing process. The morphologies of the nanowires were obtained by using the scanning electron microscope (SEM). The measurement of magnetic properties was made using the alternating gradient fors magnetometer (AGFM). The composition of the Co1-xSnx nanowires was analyzed by EDX. It has been observed that these properties were changed significantly with increasing of Sn content in nanowires. Also the affect of annealing temperature, up to 575˚C, on the magnetic properties and microstructure of as-prepared nanowires have been investigated. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3534

Arsenic compounds toxicity

Arsenic compounds toxicity have been reported of many parts of the world. Those are one of global clinical problems that affect all body organs and many cases of death every year. Arsenic compounds exist in environment and human body as form of inorganic and organic arsenic. Inorganic arsenic includes arsenite (As III) and arsenate (As V). The inorganic arsenics can be methylated to form monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) in vivo. Aasenic, especially inorganic arsenic is well absorbed (80-90) from the gastrointestinal tract, distributed in the body, often metabolized by methylation, and then primarily excreted into urine. Methylation of inorganic arsenic compounds is considered as a detoxification process. Arsenic compounds cause to DNA damage, lipid peroxidation, and decreased antioxidant defense levels. The wide human exposure to arsenic compound especial inorganic arsenic in different sources throughout the world causes great concern for human health. Long term exposure to arsenic can lead to cancer of skin and internal organs eg., the liver, lung, kidney and bladder, also high mortality rate. The noncancerous effects of ingesting arsenic include clinical manifestation in gastrointestinal, cardiovascular, pulmonary, immunological, neurological systems, endocrine glands (e.g. diabetes) and skin. There are some laboratories tests available to diagnose poisoning can measure arsenic in blood, urine, hair, and fingernails. The urine test is the most reliable for detecting arsenic exposure. Arsenic toxicity can be life threating and necessitates supportive therapy (administration crystalloid fluids, inotropic drugs and treatment of cardiac dysrhythemias), decontamination (GI tract irrigation & use activated charcoal in some patients), chelating agents that should be initiated as soon as in arsenic toxicity. These chelating agents include: BAL (British anti lewisite, dimercaprol), 2,3-dimercaptosuccinic acid (DMSA. Succimer), dimercaptopropane sulfoxid acid (DMPS), and also, long term follow-up of these patients. This review article offer to ascertain: a) find out contamination areas that exposure to arsenic to the people by water, food, soil and air; b) common diseases of arsenic poisoning in human; c) education level, awareness and treatment of contaminated people

An update on lead poisoning

BACKGROUND AND OBJECTIVE: Lead poisoning have been reported from many parts of the world. They are one of global clinical problem that effect all body organs and many deaths every year. This review was done to survey toxicological aspects of lead compounds METHODS: The data bank used in this study is web of science, scopus, pubmed, pubmed central, SID. The keywords are Alzheimer�s Disease, medical plants, acetylcholine, antioxidant. FINDINGS: Metallic lead is used industrial, organic lead eg., tetraethyl and tetramethyl lead in gasoline additives to prevent engine knock, and inorganic lead salts combined with other elements. Majority of absorptive lead through the respiratory and gastrointestinal systems. Lead compounds can lead to clinical manifestation in neurologic system, hematopoietic, kidneys, cardiovascular, reproduction, bones. There are tests available to diagnose poisoning by measuring lead in blood, urine, hair and fingernails. Patients of lead toxicity need to decontamination (GI tract irrigation), supportive cares, use traditional and new chelating agents to combination therapy, also antioxidants, vitamins, and nanoparticle. CONCLUSION: Based on the survey, it is recommended to detect contaminated areas and consider an educational plan for the exposed people to prevention of lead poisoning. © 2015, Babol University of Medical Sciences. All rights reserved

EFFECTS OF REVERSIBLE INACTIVATION OF BILATERAL ACCUMBENS NUCLEI ON MEMORY STORAGE: ANIMAL STUDY IN RAT MODEL

Introduction. Memory and learning play an important role in human"s life that will become problematic in case disability is weak for any reason. There are many factors that facilitate process of mamory and learning of which accumbens nucleus plays an important role. Accumbens nucleus, which is a part of the limbic system, is one of many nuclei found of the septum in the mesencephalon. This study was performed to determine the effects of reversible Inactivation of a accumbens nuclei by lidocaein on memory storage in rat.
 Method s. Male wistar rats were surgically implancted with cannulae at the accumbens nuclei (Acb) bilaterally one weak later they recived one trial PAL (1 mA 1.S sec) and exactly at times zero, 60 and 120 minutes after posttraining, lidocaine was infused into the Acb. Retention was tested two days after training. Latency period before entering into the dark part of the shuttle box and duration of time in darkness were index for evaluation of retention.
 Results. A significant impaired retention performance was at zero and 60 minutes after posttrianing infusion of lidocaine into the Acb. Infusion administered 120 minutes after training had no effect.
 Discussion. This study has shown that Accumbens nucleus plays major role in praimary learning and memory and it is probable that by blocking this nucleus dopamine release is diminished which causes the learning process to be delayed consequently

Development of a Novel Biosensor for Nanomolar Detection of Methylparaben

AbstractThis work describes the development of a new biosensor for methylparaben determination using electrocatalytic properties of haemoglobin in presence of hydrogen peroxide. The biosensor was fabricated by carbon paste electrode modified with haemoglobin and multiwalled carbon nanotube. Based on the excellent electrochemical properties of the modified electrode, a sensitive voltammetric method was used for determination of methylparaben within a liner range from 1 to 13μM and detection limit of 25nM. The prepared biosensor possessed accurate and rapid response to methylparaben and good sensitivity, stability and repeatability

Effects of surface curvature and surface strength on argon adsorption in carbon nanotubes at temperatures below the triple point

This paper describes an investigation of argon adsorption into carbon nanotubes at temperatures below the triple point, using a grand canonical Monte Carlo simulation to study the effects of confinement and surface strength on the 2D transition. In large pores, it was found that 2D transitions can occur in more than one layer, but are absent in higher layers for small pores. The 2D critical temperature of the first layer for a small pore (R = 1.2 nm) was found to be ca. 66 K (MWCNT) and 65 K (SWCNT), compared to 55–59 K observed experimentally for a flat graphite surface. This is because of the overlapping effects due to the surface curvature or the confinement in a carbon nanotube. Assuming a weaker carbon surface by reducing the graphene surface strength by 40% for SWCNT, the 2D critical temperature was only modestly reduced to 63 K. This suggests that the experimental data at 59 K might be attributed to other factors, other than confinement effects. An imperfect surface is suggested and, employing 5% defects on this surface, the 2D critical temperature has been determined as 58 K which is in better agreement with the experimental value of 59 K

Carbon nanotubes as heat dissipaters in microelectronics

We review our recent modelling work of carbon nanotubes as potential candidates for heat dissipation in microelectronics cooling. In the first part, we analyze the impact of nanotube defects on their thermal transport properties. In the second part, we investigate the loss of thermal properties of nanotubes in presence of an interface with various substances, including air and water. Comparison with previous works is established whenever is possible.Comment: 14 pages, 21 figures, 5 table