N,N’-Dibromo-N,N’ 1,2-ethanediylbis(benzenesulphonamide) (BNBBS): a Safe, Neutral and Efficient Reagent for the Oxidation of Primary and Secondary Alcohols to Corresponding Carbonyl Compounds under Mild Conditions

Efficient oxidation of various types of structurally diverse alcohols to the corresponding carbonyl compounds can be carried out with N,N’-dibromo-N,N’-1,2-ethanediylbis(benzenesulphonamide) in good to high yield of products in CH2Cl2 at room temperature. Primary (aliphatic, benzylic and allylic) alcohols are oxidized with no over-oxidation to carboxylic acids.Keywords: Oxidation, alcohols, carbonyl compounds, N,N’-dibromo-N,N’–1,2-ethanediylbis(benzenesulphonamide)

Epidemiological and clinical characteristics of patients with hydatid cysts in Khorasan Razavi Province, from 2011 to 2014

Background: This study aimed to investigate the epidemiological and clinical aspects of patients with hydatid cyst during 2011 to 2014. Methods: This cross-sectional study was conducted in Khorasan Razavi Prov-ince, the Northeast of Iran, from 2011 to 2014. The study population was all cases with hydatid cyst who diagnosed in governmental and private laboratories, hospitals and health centers (HC) in Khorasan Razavi Province during 2011-14. Results: The prevalence rate of hydatidosis was 1.44 per 100000 individuals. Of 357 cases, 54.9 were women, 40.3 rural, 45.8 housewives, and 3.4 were Afghan. The mean age of women was higher than that of men (39.13�18.9 compared to 34.7�17.9 yr, respectively, P-value=0.025). The highest proportion of cases (39.2) was in the age group of 21-40 yr old. Abdominal pain was re-ported in 42.3 of cases. Liver involvement was the most common localization of hydatid cyst reported in 59.4 of patients, and 8.4 had multiple organ in-volvement. The common diagnosis methods of the disease were radiology (42.3) followed by CT scan (37.8). 45.9 of patients had domestic dog and hygiene principles of washing the vegetables was adhered by 6.7 of patients. Conclusion: The prevalence of human hydatidosis, as a most important neglected disease, should be considered by health policy-makers in public health domain. In addition, educational programs to better recognition of the disease symptoms, and to identify the infection sources are needed in high risk group of population. � 2016, Tehran University of Medical Sciences (TUMS). All rights reserved

Investigation of the effect of ph value on the removal of cobalt from aqueous solutions by low cost activated carbon material

It is well recognized that the Cobalt is among the prominent contaminants in aqueous solutions. This hazardous metal can result in a high risk contamination and causes illness. It should be mentioned that the Cobalt metal also appears in wastewaters of a lot of manufacture and it can produce variety of undesirable effects. For removal of this contaminant from water many methods are used in this way. In this paper the bark of oak is intended as an alternative, low-cost, filter material for contaminated waters. In this research we investigate the removal of Cobalt metal on activated carbon. This was prepared from Iranian oak bark, from solutions. Adsorption of Cobalt was studied in batch tests. In this research, the effect of pH as the operation condition was investigated. The obtained results are discussed in the following sections

Influence of the addition of nano-Silica particles as reinforcement on the tensile yield properties of Polyamide 6 polymeric matrix used in medical applications

It is well known that the polymer matrix nanocomposites are one of the most important polymeric materials that are used in medical applications due to the exhibition of very good mechanical and thermal properties. In this study the authors have used Polyamide 6 (Nylon) polymer for preparing polymeric nanocomposite samples. Silica nano-particles have been used as reinforcement for reinforcing the polyamide 6 polymer matrix. After the sample preparation, influence of nano-particles on the tensile ultimate strength and tensile Young modulus of the Polyamide 6 has been investigated experimentally. It is found that using nano-silica can significantly improve the tensile properties of Polyamide 6 polymer. Test results shows that addition of nano-scale silica particles can modify the tensile characterstics of the polymer i.e. improve the tensile elastic Young's modulus of the polymer. Similar trend is observed for the tensile ultimate strength of polyamide 6 nanocomposites, where the presence of nano-silica modify the ultimate strength of the material

Removal of m-xylene from water by impregnated activated carbon

Volatile organic compounds (VOCs) are the main matters which can pollute water therefore, must be controlled under increasingly stringent environmental regulations.This work analyses the adsorption of impregnated active carbons prepared with oak bark to remove m-xylene from aqueous solutions. When the impregnation step is performed on the raw material then carbonizations of activated carbon was carried out. Not expensive raw material and chemical agent were used as active species where used for preparing the appropriate adsorbent for removal of m-xylene from water. In this work the effect of adsorption temperature, pH and the initial concentration of process were investigated. It is clear that with increasing the initial concentration the removal efficiency of adsorption will be increased. The effect of temperature was studied by increasing the temperature from 20 to 60 °C. with increasing the temperature the removal efficiency will be increased in the range of 20-60 °C

Investigation of the physical abrasion of ternary polymer reinforced with nanoparticles used in medical applications

Nanocomposites are one of the most important polymeric materials that exhibit excellent biological, physical, chemical and thermal properties. Rubber based nanocomposites is one of the mast interesting field in the literatures and material science. The abrasion properties of ternary nanocomposites based on Styrene Butadiene rubber have been investigated with presence of nano aluminum oxide. The nanocomposites have been prepared by mechanical blending using two roll mills. Nano Aluminum oxide particles have been added to Styrene Butadiene rubber/Phenolic Resin binder and the abrasion properties have been surveyed. Results showed that the nano Aluminum oxide particles could enhance the abrasion resistance of matrix due to abrasive properties of nano Aluminum oxide particles. In order to better understanding the behavior of the material, optical microscopic observation and scanning electron microscopic pictures hve been conducted in this investigation that the obtained results revealed the presence of this phenomenon in abrasion properties of the ternary nanocomposite polymeric samples

Adsorption of acetone from polluted air by activated carbon derived from low cost materials

In this investigation, adsorption of acetone from air on the activated carbon derived from agricultural solid waste was studied. The best of our knowledge is to find the best activated carbons from low cost material to remove hazardous compound. The effect of adsorption temperature, initial concentration and effect of raw materials were reported. It is clear that the adsorption temperatures have the negative effect on the adsorption capacity. The adsorption capacity increases with increasing the initial concentration. Three activated carbons were prepared, one (Norit) was purchased and apricot and walnut shell were prepared by physical method and carbon dioxide and water vapor as chemical agent, respectively

Impact of loss on the wave dynamics in photonic waveguide lattices

We analyze the impact of loss in lattices of coupled optical waveguides and find that in such case, the hopping between adjacent waveguides is necessarily complex. This results not only in a transition of the light spreading from ballistic to diffusive, but also in a new kind of diffraction that is caused by loss dispersion. We prove our theoretical results with experimental observations.Comment: Accepted for publication in PRL, 5+8 pages (Paper + Supplemental material), 4 figure

Investigation of the removal of heavy hazardous metals by agricultural solid waste as an cheap reliable adsorbent

It is well-recognized that the heavy metals are among the prominent contaminants in aqueous solutions. This hazardous metal can result in a high risk contamination and causes illness. It should be mentioned that the metals also appears in wastewaters of a lot of manufacture and it can produce variety of undesirable effects. For removal of this contaminant from water many methods are used in this way. This paper investigates adsorption Sr (II) from aqueous solutions is the most important aim of this paper. A low cost adsorbent which prepared by hazelnut shell as an agricultural solid waste was used in this study. The best of our knowledge is to use solid waste as an adsorbent without converting it to activated carbon, just by simple method. Some operational conditions such as temperature, speed velocity of stirrer and dose of prepared adsorbent were investigated by some experiments. The high efficiency adsorption was achieved by this low cost adsorbent. The raw material in this research was collected from Iranian garden