Potentiometric and conductometric studies of malonyl bis(salicyloylhydrazone) and divalent metal complexes

AbstractA series of complexes of divalent transition metal ions with malonyl bis(salicyloylhydrazone) (H4MSH) have been prepared and characterized with the help of conductometric, potentiometric methods. The proton–ligand and metal–ligand stability constants were obtained pH-metrically. The electrical conductivity of solid complexes was measured at 289K. The low molar conductance values observed for these complexes indicate that, they are non-electrolytes. They are soluble to a limited extent in DMF and DMSO. The elemental analyses of the complexes indicate that the complexes have 1:1 and 2:1 (M:L) stoichiometry with the existence of water, chloride, acetone molecules inside the coordination sphere as evidence from the IR spectral studies. Further, the complexes have been formulated by comparing C, H, N & metal analysis data, and UV–visible spectra of the complexes have been discussed. The protonation constants of the ligand and the stability constants of their metal complexes will be evaluated potentiometrically. The stoichiometric ratios of the complexes formed in solution will be evaluated applying the molar ratio (spectrophotometric) method and confirmed conductometrically

Interleukin-12 levels in Egyptian children with type 1 diabetes mellitus

Background: Type 1 diabetes mellitus (T1DM), arising through a complex interaction of immune, genetic and environmental factors, results from autoimmune destruction of insulin-producing β cells. Cytokines are critical to the function of both innate and adaptive immune responses. Interleukin-12 p40 production influences T cell response, and may therefore be important in T1DM pathogenesis. Objective: to study the changes in IL12 levels in children with T1DM. Study design: fifty T1DM children among those attending diabetes clinic at Zagazig University hospitals, were included in the study. They were 27 males and 23 females (mean age, 9.19 ± 3.3 years). Thirty age and sex matched healthy children were serving as a control group. All children were subjected to full history taking, physical examination, complete blood count (CBC), random blood sugar, glycated hemoglobin (HBA1C) and serum IL-12 levels assessed by ELISA. Results: Diabetic children had significantly higher white blood cell count, HBA1C, and IL12 levels than healthy children. While there was no effect of gender on IL12 levels, there were significant increase in IL12 levels in newly diagnosed cases, those with higher body mass index and those who had the poorest glycemic control. Conclusion: type 1 diabetes is associated with elevation of IL-12 levels. This association is more evident in both newly diagnosed and poorly controlled patients indicating a relevant role of IL-12 in the pathogenesis of the disease.Keywords: Type 1 Diabetes Mellitus, Interleukin 12, EgyptEgypt J Pediatr Allergy Immunol 2013;11(1):41-4

The Performance of Cold-Formed Steel Members with Stiffened Perforations

CFS sections are usually supplied with openings to adapt construction services. Nevertheless, the area lowering in the web influences their strengths. If stiffeners are provided near the web openings, the reduction in flexural capacity could be recovered. Therefore, this paper introduces a study on the CFS section with stiffened perforations. A finite element (FE) analysis was accomplished. The numerical model was verified versus experimental and numerical tests from prior research and then utilized in performing parametric studies. The influence of circular openings with various sizes and various stiffener lengths on the flexural capacity was examined in the nonlinear analysis. Depending on the findings of the study, it has been determined that the introduction of stiffened openings into the CFS members will result in the restoration of the original flexural capacity

Formulation of Synthesized Zinc Oxide Nanopowder into Hybrid Beads for Dye Separation

The sol-gel prepared zinc oxide nanopowder was immobilized onto alginate-polyvinyl alcohol polymer blend to fabricate novel biocomposite beads. Various physicochemical characterization techniques have been utilized to identify the crystalline, morphological, and chemical structures of both the fabricated zinc oxide hybrid beads and their corresponding zinc oxide nanopowder. The thermal stability investigations demonstrate that ZnO nanopowder stability dramatically decreased with its immobilization into the polymeric alginate and PVA matrix. The formulated beads had very strong mechanical strength and they are difficult to be broken up to 1500 rpm. Moreover, these hybrid beads are chemically stable at the acidic media (pH < 7) especially within the pH range of 2–7. Finally, the applicability of the formulated ZnO hybrid beads for C.I. basic blue 41 (BB41) decolorization from aqueous solution was examined

Influence of Reaction Time, Reducing Agent and Zinc Precursors on the Morphological Structures of Zinc Oxide

ZnO either nanoparticles or nanorods were synthesized via sol-gel technique. Many factors were studied and optimized in order to obtain different morphological structures of nano-ZnO. Effect of reaction time (3, 6, 12, 24 and 48 hours) has been studied to optimize the best preparation condition. Reducing agent (NH3, NaOH and KOH) is one of the factors affect on morphological structures, which has been studied in this work. Other effect has been studied in this work is zinc precursors such as Zn(NO3)2, ZnAc2, ZnCl2, and ZnBr2. The morphological structures of prepared ZnO were revealed using scanning electron microscope (SEM) and the aspect ratios were calculated. x-ray diffraction (XRD) patternsexposed a highly crystallized wurtzite structure and used for identifying phase structure and chemical state of ZnO under different preparation conditions.Keywords: sol-gel, morphological structures, reducing agent, SEM, preparation conditions

Utilization of Synthesized Nano-Zinc Oxide in Yellow Basic Dye Decontamination from Industrial Wastewater

ZnO nanorod has been successfully synthesized through the reduction of Zinc chloride salt with ammonia solution in the presence of triethanolamine (TEA) as surfactant agent via hydrothermal technique. The properties of the produced material were determined using different characterization techniques such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and Fourier Transform Infrared spectrum (FTIR). The results showed that the asprepared ZnO are rod- like morphologies at pH equal to 10. The synthesized nano rod-zinc oxide was employed asadsorbent agent for basic yellow 28 dye decolorization from polluted industrial wastewater. The synthesized nano-ZnO was achieved 93.26% dye decolorization affinity with in 60minutes. The variation in the different processing parameters on the dye sorption process was elucidated using batch technique. The increment in both the dye solution pH and its  temperature was association with decline in the decolourization process. The optimum nano-zinc oxide dosage was recorded to be equal to 10 g/L. The adsorption data at equilibrium were analyzed using Langmuir, Freundlich and Temkin equilibrium isotherms. The experimental results confirmed the applicability of synthesized nano-zinc oxide as adsorbent agent for dye decontamination from polluted wastewater.Keywords: nano-zinc oxide, dye decolourization, sorption parameters

Allergic bronchopulmonary aspergillosis as a cause of bronchial asthma in children

Background: Allergic bronchopulmonary aspergillosis (ABPA) occurs in patients with asthma and cystic fibrosis. When aspergillus fumigatus spores are inhaled they grow in bronchial mucous as hyphae. It occurs in non immunocompromised patients and belongs to the hypersensitivity disorders induced by Aspergillus. Objective: To diagnose cases of allergic bronchopulmonary aspergillosis among asthmatic children and define the association between the clinical and laboratory findings of aspergillus fumigatus (AF) and bronchial asthma. Methods: Eighty asthmatic children were recruited in this study and divided into 50 atopic and 30 non-atopic children. The following were done: skin prick test for aspergillus fumigatus and other allergens, measurement of serum total IgE, specific serum aspergillus fumigatus antibody titer IgG and IgE (AF specific IgG and IgE) and absolute eosinophilic count. Results: ABPA occurred only in atopic asthmatics, it was more prevalent with decreased forced expiratory volume at the first second (FEV1). Prolonged duration of asthma and steroid dependency were associated with ABPA. AF specific IgE and IgG were higher in the atopic group, they were higher in Aspergillus fumigatus skin prick test positive children than negative ones .Wheal diameter of skin prick test had a significant relation to the level of AF IgE titer. Skin prick test positive cases for aspergillus fumigatus was observed in 32% of atopic asthmatic children. Conclusion: ABPA occurs in 1/3 of atopic asthmatic children and is related to the duration and severity of asthma.Keywords: Aspergillosis, bronchial asthma, childrenEgypt J Pediatr Allergy Immunol 2012;10(2):95-10

Stellar parameters of Be stars observed with X-shooter

Aims. The X-shooter archive of several thousand telluric star spectra was skimmed for Be and Be-shell stars to derive the stellar fundamental parameters and statistical properties, in particular for the less investigated late type Be stars, and the extension of the Be phenomenon into early A stars. Methods. An adapted version of the BCD method is used, utilizing the Balmer discontinuity parameters to determine effective temperature and surface gravity. This method is optimally suited for late B stars. The projected rotational velocity was obtained by profile fitting to the Mg ii lines of the targets, and the spectra were inspected visually for the presence of peculiar features such as the infrared Ca ii triplet or the presence of a double Balmer discontinuity. The Balmer line equivalent widths were measured, but due to uncertainties in determining the photospheric contribution are useful only in a subsample of Be stars for determining the pure emission contribution. Results. A total of 78 Be stars, mostly late type ones, were identified in the X-shooter telluric standard star archive, out of which 48 had not been reported before. The general trend of late type Be stars having more tenuous disks and being less variable than early type ones is confirmed. The relatively large number (48) of relatively bright (V > 8.5) additional Be stars casts some doubt on the statistics of late type Be stars; they are more common than currently thought: The Be/B star fraction may not strongly depend on spectral subtype.Comment: Accepted for publication in A&

Influence of Reaction Time, Reducing Agent and Zinc Precursors on the Morphological Structures of Zinc Oxide

ZnO either nanoparticles or nanorods were synthesized via sol-gel technique. Many factors were studied and optimized in order to obtain different morphological structures of nano-ZnO. Effect of reaction time (3, 6, 12, 24 and 48 hours) has been studied to optimize the best preparation condition. Reducing agent (NH3, NaOH and KOH) is one of the factors affect on morphological structures, which has been studied in this work. Other effect has been studied in this work is zinc precursors such as Zn (NO3)2, ZnAc2, ZnCl2, and ZnBr2. The morphological structures of prepared ZnO were revealed using scanning electron microscope (SEM) and the aspect ratios were calculated. x-ray diffraction (XRD) patterns exposed a highly crystallized wurtzite structure and used for identifying phase structure and chemical state of ZnO under different preparation conditions