bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis and CO2 sorption of silica particles, kinetics and thermodynamics
Authors: BOUHALI Hasna , CHALAL Nabila , HAMAIZI Hadj , BENGUEDDACH Abdelkader
Published: May 2018

Spherical ordered mesoporous silica particles with radially oriented mesopores were successfully prepared by using non-ionic amphiphilic di-block co-polymers CnH2n+1-(EO)x-OH as template and tetraorthosilicate (TEOS) as silica precursor. The synthesized mesoporous silica materials were characterized by XRD, N2 adsorption-desorption and SEM techniques. CO2 adsorption at 0 °C was evaluated by a volumetric method, and the CO2 sorption behavior was described by applying both Langmuir and Freundlich equations. Results indicate a high adsorption capacity of CO2 (5-9 mmol/g), depending essentially on the porous texture of the materials. An adsorption kinetic model was proposed to describe the adsorption of CO2 over template-free mesoporous siliceous materials. A good agreement with experimental data was found.
pH Assist for Highly selective determination of Xipamide by the enhancement of the green emission of Tb3+ optical sensor
Authors: Attia M. S. , Yuossef A. O. , Diab M. , El-Shahat M. F.
Published: May 2018

The highly selective, accurate method for determination of Xipamide was maintained. The method depends on the enhancement of the green emission band of Tb3+ at 545 nm in the presence of different concentration of  Xipamide at pH 4.1 and λex = 320 nm in acetonitrile. The photophysical properties of the green  emissive Tb3+  complex have been elucidated, the terbium was used as optical sensor for the assessment of  Xipamide in the pharmaceutical tablets and body fluids with a concentration range 5.0 ×10−9 – 2.3 ×10−6 mol L−1 of xipamide, correlation coefficient of 0.995 and  detection limit of 8.5 ×10−10 mol L−1.
Interionic Pair Potential, hard sphere diameter and entropy of mixing of NaCd compound forming binary molten alloys under the framework of Pseudopotential theory
Authors: Chatterjee Sujeet Kumar , Prasad Lokesh Chandra , Bhattarai Ajaya
Published: May 2018

The observed asymmetric behaviour of mixing of  NaCd liquid alloys around equiatomic composition with smaller negative values for free energy of mixing at compound forming concentration, i.e. GMXS = -4.9KJ at Ccd =0.66 has  aroused our interest to undertake a theoretical investigation of this system.A simple statistical mechanical theory based on compound formation model has been used to investigate the energetics of formation of intermetallic compound Cd2Na in the melt through the study of entropy of mixing.Besides, the interionic interactions between component atoms Na and Cd of the alloys have been understood through the study of interionic pair potential фij(r), calculated from pseudopotential theory in the light of CF model.Our study of фij(r) suggest that the effective interaction between Na-Na atoms decreases on alloying with Cd atom, being minimum for compound forming alloy( Cd 0.66 Na 0.34 ).The nearest neighbor distance between Na-Na atoms does not alter on alloying. Like wise Na-Na,  effective interaction between  Cd-Cd atom decreases from pure state to NaCd alloys, being smaller at compound forming  concentration Cd 0.66 Na 0.34.The computed values of SM from pseudopotential theory are positive at all concentrations, but the agreement between theory and experimental is not satisfactory. This might be happening due to parameterisation of σ3 and Ψcompound.
BENTONITE/CHITOSAN BIOCOMPOSITE AS AN ADSORBENT FOR HEXAVALENT CHROMIUM FROM AQUEOUS SOLUTIONS
Authors: Hammou Ahlafi , MOUSSOUT H. , SLIMANI MY. S. , BOUKHLIFI F. , DAOU I.
Published: May 2018

The present work focuses on the study of the application of abundant and less expensive materials such as chitosan and bentonite/chitosan biocomposite in the removal of hexavalent chromium. Spectroscopic analysis like techniques FTIR, XRD and BET have been used to characterize the adsorbents. The data indicate that the adsorption of chromium proceeds kinetically according to a pseudo-second order model on both samples and the apparent activation energy (Ea) have been measured to be 22.9 kJ.mol−1 and 84.4 kJ.mol−1 for chitosan and 5%Bt/CS, respectively. The adsorption isotherm experiments show that the adsorption capacity depends on the studied chromium adsorption temperature. It has been found that the data could be well described by the Langmuir as well as the Freundlich models. Thermodynamic parameters (i.e., change in the free energy (DG°), the enthalpy (DH°), and the entropy (DS°) have been also, evaluated.
THERMOGRAVIMETRIC ANALYSIS OF NANO CRYSTALLINE CERAMIC PbSrCaCuO
Authors: Jacob Reenu , Isac Jayakumari
Published: May 2018

Nano crystalline ceramic PbSrCaCuO was prepared by the solid state technique via a high-energy ball milling process through mechanically assisted synthesis.The prepared sample was then subjected to calcinations to acquire the desired homogeneity and phase formation. To establish the elemental composition EDX analysis was done.TGA and DTA were used to study the behaviour of the sample upon heating to a high temperature.
SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY OF NOVEL PYRAZOLO[3,4-b]PYRIDINES AND THEIR SPIRO-HETEROCYCLIC DERIVATIVES
Authors: Abdelmohsen Shawkat A. , Emary Talaat I El
Published: May 2018

The present work describes the synthesis of a novel series of heterocyclic moieties derived from 5-acetylpyrazolo[3,4-b]pyridine (1). The formation of chalcones (2a-d) was utilized to synthesize pyrazoline, isoxazoline and pyrimidine derivatives (3-10). Thiosemicarbazone and semicarbazone (11, 17) were utilized to synthesize other new triazolethiones, thiadiazole and selenadiazole derivatives (11-19). Some new spiro derivatives (22-25) were synthesized by the reaction of chalcone (21) of 1 and isatine with hydrazines, hydroxyl amines and thiourea. Also, The reaction of 1 with cyanoacetyl hydrazine gave the hydrazide-hydrazone derivative 26, which was allowed to react with aromatic aldehydes and α-cyanocinnamonitrile to afford coumarine and substituted pyridine derivatives (28, 29). The structures of all the new compounds have been established on the basis of their analytical and spectral data. Twenty two of the synthesized compounds were also evaluated for their antibacterial and antifungal activity against various strains of bacteria and fungi and most are found to possess promising antimicrobial activity when compared with Chloramphenicol and Clotrimazole
Structural, Thermal behaviour and Vibrational study of a new Cesium- Ammonium Dihydrogen Phosphate–Arsenate: Cs0.55(NH4)0.45H2(PO4)0.39(AsO4)0.61
Authors: CHAUCHENE Samia , JAOUADI Khaled , MHIRI Tahar
Published: May 2018

Mixed crystals Cs0.55(NH4)0.45H2(PO4)0.39(AsO4)0.61 (CADPA) of the two antiferroelectric NH4H2PO4 (ADP) and NH4H2AsO4 (ADA) and of the two ferroelectric CsH2PO4 (CDP) and CsH2AsO4 (CDA) have been prepared by slow evaporation from aqueous solution at room temperature. The structural properties of the crystal were characterized by X-ray single analysis (performed at room temperature), which revealed that (CADPA) crystallizes in space group I42d with lattice parameters: a = 7.6473(1) Å, c = 7.6803(1) Å and Z = 4. The title compound is isostructural with the tetragonal phases of (ADP) and (ADA). This structure is characterized by two kinds of disorder: a statical or dynamical disorder of the acidic proton in the O–H…O hydrogen bond and another one which is connected with a reorientational motion of NH4+ ions. Broader peaks in the IR spectrum confirm a structural disorder in this material. Thermal analysis of the (CADPA) were characterized by differential scanning calorimetry (DSC), showed that the title compound undergo two phase transitions at T = 204 K and T = 407 K.
REGIOSELECTIVE AND FACILE OXIDATIVE THIOCYANATION OF ANILINES AND INDOLES WITH TRANS-3,5‐DIHYDROPEROXY‐3,5‐DIMETHYL‐1,2‐DIOXOLANE
Authors: Azarifar Davood , Golbaghi Maryam , Pirveisian Mahtab , Najminejad Zohreh
Published: May 2018

Oxidative potential of trans‐3,5‐dihydroperoxy‐3,5‐dimethyl‐1,2‐dioxolane (DHPODMDO) has been explored in the facile thiocyanation of anilines and indoles through the efficient and in situ generation of SCN+ ion from sodium thiocyanate. The reactions proceed with regioselectivity under mild conditions at room temperature to afford the respective thiocyanate derivatives in excellent yields and low reaction times.
Preparation and characterization of hydroquinone based polyoxalate and its application in the removal of heavy metals from water
Authors: Alsafadi Diya , Sweileh Bassam A. , Khalili Fawwaz I.
Published: May 2018

Hydroquinone based polyoxalate was synthesized from oxalyl chloride and hydroquinone. The polymer was characterized with FTIR, 1H-NMR, 13C-NMR, PXRD, SEM and thermal analysis. The chelation behaviour of the polymer towards Pb(II), Cd(II), and Hg(II) in aqueous solutions was studied by batch technique as a function of contact time and pH. The polymer showed high metal uptake toward Pb(II) and Cd(II) and moderate metal uptake toward Hg(II). The adsorption capacity was not affected by the pH of solution. The adsorption data were fitted with second order kinetic model and the isotherms models of Langmuir and Freundlich. Thermodynamics measurements showed that sorption process was spontaneous. Furthermore, the chelating polymer was loaded with metal ions using fixed bed column. For regenerating the loaded polymer, different eluting agents include HNO3, H2SO4, and EDTA was investigated. The highest recovery of metal ions was achieved using HNO3, indicating that desorption process was governed by the solubility factor and cation exchange mechanism.
Leucine: green and efficient catalyst for the synthesis of 4H-chromenes
Authors: Azarifar Davood , Abbasi Younes , Badalkhani Omolbanin
Published: May 2018

Leucine, a naturally occurring Î±-amino acid, has been found as an effective catalyst to effect the one-pot three-component condensation reaction between aromatic aldehydes, malononitrile and 5,5-dimethyl-1,3-cyclohexanedione (dimedone). Various 2-amino-4-aryl-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile derivatives are conveniently prepared by these reactions in excellent yields. High yields, short reaction times, simple work-up, use of green and naturally occurring catalyst and solvent are the main merits of the present protocol.
FLAVONOID DISTRIBUTION IN FOUR VARIETIES OF Ficus deltoidea (JACK)
Authors: Dzolin Syazwani , Ahmad Rohaya , Zain Mazatulikhma Mat , Ismail Mohd Ikhwan
Published: May 2018

We have previously reported the antioxidant and neuroprotective activities of the aqueous extract of four varieties of Ficus deltoidea (Fd) (Moraceae) namely var kunstleri (Fdvk), var angustifolia (Fdva), var deltoidea (Fdvd) and var intermedia (Fdvi). In this study, flavonoid constituents in aqueous leaf and fig extracts of the four varieties were analyzed and characterized using liquid chromatography mass spectrometer quadrupole-time of flight (LCMS-Q-TOF) via hierarchical cluster analysis (HCA) technique. The HCA dendrogram revealed that the abundant flavonoids among the eight samples are epicatechin, quercetin-3-rutinoside, quercetin 5,4'-di-O-beta-D-glucopyranoside, myricetin and naringenin. The study found that the distribution of the flavonoids differed between the four varieties and varied within the plant parts. To date, the flavonoid distribution of the different plant parts of the four varieties has not been documented. A positive correlation was observed between flavonoid constituents present and radical scavenging activities of the aqueous extracts.
INVESTIGATION IMIDAZOLINE DERIVATIVES OBTAINED FROM SYNTHETIC PETROLEUM ACIDS AS CORROSION INHIBITOR
Authors: L.M. Afandiyeva , V.M. Abbasov , D.B. Agamaliyeva , N.İ. Mursalov , Sh.Z. Jabrayilzadeh , N.M. Mammadova , F.N. Seyidahmadova , Z.Y. Tagizade
Published: May 2018

Imidazoline derivatives have been synthesized based on the synthetic petroleum acids (SPA) and diethylentriamine. Complexes were prepared from these compounds and HCl in ratio 1:1, 1:2, 1:3. 20% solution of the complexes were prepared in aqueous isopropyl alcohol. The kinetic effect of steel corrosion in 1% NaCl solution saturated with CO2 were studied ACM Gill AC potentiometer. It was found that, the imidazoline derivatives complexes based on the SPA and DETA with HCl in molar ratio 1:1 of 25 ppm concentration protection from corrosion is 83,5%, 100 ppm  concentration – 97,1%; the proportion of 1:2 complex of  25 ppm – 82,8%, 100 ppm  concentration – 97,3%, but in the case of the 1:3 complex shows the best result - 94 and 98,8%.
SYNTHESIS AND EVALUATION OF ETHYL (4-(N-(THIAZOL-2-YL) SULFAMOYL) PHENYL)CARBAMATE (TSPC) AS A CORROSION INHIBITOR FOR MILD STEEL IN 0.1M HCL
Authors: El-Shamy A. M. , Shehata M. F. , Gaballah Samir T. , Elhefny Eman A.
Published: May 2018

Laboratory synthesized ethyl (4-(N-(thiazol-2-yl)sulfamoyl)phenyl)carbamate (TSPC), characterized by 1H NMR spectroscopy, was evaluated as corrosion inhibitor of mild steel in 0.1M HCl using electrochemical techniques. Open circuit potential, potentiodynamic polarization and impedance spectroscopy were used to evaluate the inhibition efficiency of (TSPC) at various concentrations. The obtained electrochemical data indicated that (TSPC) acts as moderate corrosion inhibitor for mild steel in acidic media. It is found that the inhibition efficiency increases with the concentration of the inhibitor till 400ppm. The adsorption isotherm involving physisorption of (TSPC) at room temperature and the experimental data complied to the Langmuir adsorption isotherms and the negative values of the Gibb’s free energy of adsorption obtained suggested that inhibitor molecules have been spontaneously adsorbed onto the mild steel surface.
Secondary Metabolites from the Leaves of Aquilaria agallocha
Authors: Chen Cheng-Ta Li , Kao Chiu-Li , Liu Chi-Ming , Li Wei-Jen , Li Hsing-Tan , Wu Hui-Ming , Huang Cheng-Tsung , Chen Chung-Yi
Published: May 2018

Twelve compounds, including three flavonoids, 5-hydroxy-4¢,7- dimethoxyflavone (1) [22], luteolin-7,3¢,4¢-trimethyl ether (2) and 5,3¢- dihydroxy-7,4¢-dimethoxyflavone (3), five benzenoids, methylparaben (4), vanillic acid (5), p-hydroxybenzoic acid (6), syringic acid (7), and isovanillic acid (8) and four steroids, b-sitosterol (9), stigmasterol (10), b-sitostenone (11) and stigmasta-4,22-dien-3- one (12) were isolated from the leaves of Aquilaria agallocha (Thymelaeaceae). All of these compounds (1-12) were obtained for the first time from the leaves of this plant.
Coumarin phthalonitriles: Synthesis and cation binding properties
Authors: Medyouni Rawdha , Naouali Olfa , HAMDI Naceur , Baklouti Lassaad
Published: May 2018

Coumarin possess a number of biological activities like anticoagulant, antimicrobial, anti-inflammatory, analgesic,antioxidant, anticancer, antiviral, antimalarial etc. Coumarin belongs to a group as benzopyrones, which consists of a benzene ring joined to a pyrone nucleus. In this work, new coumarin phtalonitriles derivatives were synthesized and characterized via spectroscopic techniques IR, 1H NMR, 13C NMR, mass spectra and elemental analysis.The synthesis of coumarin phtalonitriles resulting from a nucleophilic aromatic substitution reaction between 4-nitrophtalonitrile and coumarins derivatives. The complexing properties of the coumarin derivatives toward alkali metal, alkaline earth metal, some transition metals and some heavy metal cations have been investigated in acetonitrile by means of UV spectrophotometry absorption and conductivity methods. Thus, the stoichiometry of the complexes formed and their stability constants were determined
Markers characterizing corneal damage during aging of rat
Authors: El-Sayyad Hassan I. H. , El-Mansi Ahmed A. , Guida Mona S , Mohammed Ezaldin AM
Published: May 2018

Aging is a biological phenomenon that involves an increase of oxidative stress associated with gradual degradation of the structure and function of the cornea. Gender differences and subsequent deterioration of cornea is an interesting topic, especially yet few data are available concerning the impact of age, especially on the corneal. One hundred male and female Wistar albino rats ages 3, 6, 18, 24, and 30 months (n=10 equal for male and female) were used. At the time interval, cornea were investigated by light and transmission electron microscopy (TEM), immunohistochemistry of caspase 3 (casp3), glial fibrillar acidic protein(GFAP) and CD45 and  flow cytometry of DNA, bcl-2-like protein 4 (BAX), transforming growth factor beta (TGF-β) and Cd45 (lymphocyte common antigen). Light and TEM investigation  revealed apparent deterioration of atrophy of corneal epithelium with vesicular vacuolar degeneration, hyalinization of stromal collagen fibrils and swelling and degeneration of the endothelial lining the descemet's membrane. There was apparent loss of keratocytes within corneal stroma. Immunohistochemistry of casp 3 and CD45 were markedly increased manifesting cell damage. GFAP showed apparent reduction of innervation of corneal stroma and endothelium layer. Flow cytometry of DNA, Bax and TGF revealed increased apoptic cell death of cornea of 30M-old rats. We concluded that aging contributed to an apparent increase of cellular damage of different corneal region associated with alterations of cell markers.
Metal containing composites based on styrene copolymers and butoxyl methyl methacrylate as a catalyst in the oxidation of the diesel fraction
Authors: Abbasov V.M. , İbragimova M.C. , Guliyev A.D. , Ibragimova T.A. , Efendiyeva L.M. , Nagiyev V.A. , Seidova S.A.
Published: May 2018

The article presents the results of studies on the metal-based composites on the basis of copolymers and block copolymers of styrene with butoxymethyl methacrylate (BOMMA) as a catalyst in the oxidation process of naphthene paraffin fraction, which was obtained by extraction method of  dearomatization of diesel fraction. It was shown that at low concentrations of metals of variable valency in the content of the catalyst here is sufficiently high yield of synthetic petroleum acids.
UTILIZATION OF AQUEOUS, METHANOL AND CHLOROFORM EXTRACTS OF LOCAL PLANTS- IXORA COCCINEA AND HIBISCUS SABDARRIFFA (ZOBO) FROM ABAKALIKI AS FABRIC DYES
Authors: C Nwokonkwo Dorothy
Published: May 2018

This investigation dealt with the dyeing and fastness properties of crude constituents of Ixora coccinea and Hibiscus sabdarriffa plant species extracted using distilled water, methanol and chloroform. Approximately 150 g of each sample was soaked in the chosen solvent for four weeks, the percentage yields of the aqueous, methanol and chloroform extracts of Ixora coccinea were 38.47% and 13.40 % and 3.88 % respectively; Hibiscus sabdariffa gave yields of 22.85 %  for the aqueous extract, 12.24 % for the methanol extract and 3.79 % for the chloroform extract. Aqueous, methanol and chloroform extracts of Ixora coccinea were all pink in colour; Hibiscus sabdariffa gave red aqueous extract, red methanol extract and orange chloroform extract. The extracts were used without further purification in dyeing unmordanted and mordanted cotton and polyester fabrics. Different colour shades were obtained after dyeing. The mordanted fabrics using CuSO4, FeSO4 and K2CrO7 were fast to acid, alkali and washing.Key words dyeing, extract, fastness, mordant, solvent
Silver/Polyethylene Glycol Nanocomposite Thin Films and its Biological Applications
Authors: Fahmy Alaa
Published: May 2018

The synthesis of silver nanoparticles with different sizes and concentrations was carried out using NaBH4 as a reducing agent and polyethylene glycol (PEG) as a stabilizer. The thin films of PEG embedded with Ag nanoparticles (Ag NPs) were deposited by electrospray deposition technique (ESD) and the morphology of subsequent prepared films was studied by AFM. Structure-property relationships of the colloid and subsequent films were discussed in dependence on the concentration of NaBH4. The synthesized Ag/PEG nanocomposite solution was characterized by UV-visible spectroscopy and Transmission electron microscopy (TEM). Chemical composition in the whole and on the surface of films were investigated by Fourier transform infrared (ATR-IR) and X-ray photoelectron microscopy (XPS), respectively. The UV-visible results indicate to the formation of spherical Ag NPs where the absorption peak was observed at wavelengths around 395 nm. TEM images showed the well dispersion of Ag NPs in the PEG matrix with average particle size of 13 nm.  Furthermore, the antimicrobial activity of the nanocmposite was studied. The Ag NPs released from the polymer matrix proven to have a significant antimicrobial activity against S. Pneumonia, B. Subtilis, E. Coli, and A. Fumigates.
Chemical and Electrochemical studies on the corrosion of mild-steel, copper and zinc in 0. 5 M H2SO4 solution in presence of Azithromycin as effective corrosion inhibitor
Authors: Abdullatef O. A
Published: May 2018

Azithromycin has been tested as inhibitor for steel, copper and zinc corrosion in 0.5 M H2SO4 was studied using potentiodynamic polarization and electrochemical impedance spectroscopy.  The results showed that the inhibition efficiency increased with increasing the concentration of Azithromycin. The adsorption characteristics of Azithromycin in presence of steel, copper and zinc metals were studied and the data  found to fit the Kinetic-Thermodynamic model. IR spectroscopy of the corrosion product with the inhibitor confirmed the formation of metal ion inhibitor complex.
Preparation, characterization, antibacterial and antifungal activities of some transition metal complexes with novel Schiff base ligand derived from N-amino rhodanine
Authors: Mahjoub Soleiman , Ansari Sara , Heshmatpour Felora
Published: May 2018

The Schiff base ligand (E)-3-(2-methoxy benzylidene amino)-2-thioxothiazolidin-4-one (L), was prepared from N-amino rhodanine and 2-methoxy benzaldehyde . Moreover, Its complexes were synthesized by mixing metal chloride Co(II), Cu(II), Ni(II) with the prepared Schiff base ligand. These compounds were characterized by FTIR, 1H NMR, and elemental analysis. The antimicrobial activity of the ligand and its complexes were tested using four pathogenic bacterial and two fungal species. The bacterial species used in the screening were Salmonella typhi and Vibrio cholera (gram negative) and Staphylococcus aureus and Bacillus subtilis (gram-positive). The fungal species were Aspergillus flavus and Aspergillus nigar. The antimicrobial activities of the ligand and its metal complexes were studied by disc agar diffusion method and compared with Ampicillin. Diameter of inhibition zone (mm) including the disc diameter was measured for each treatment. The findings indicated that the CuL, NiL and CoL complexes have good biological activity but the ligand (L) did not had any activity against the microorganisms under identical experimental conditions.
FORMATION AND PROPERTIES OF CARBON IN POROUS SPACE OF SILICA-ALUMINA CERAMICS
Authors: Vlasova Marina , Rivera-Bahena Catalina Bustos , Dominguez-Patino Gloria , Kakazey Mykola , Tapia Rene Guardian
Published: May 2018

By using of XRD, IR, SEM methods and microanalysis, it was investigated the process of carbon formation during thermo destruction of sucrose inside pores of silica-alumina ceramics in conditions of oxygen deficient. It was found that for carbon formation inside pores, temperature treatment of sucrose must be 600oC and time of heating 15 min. At such regime of carbonization, carbon material is produced in the form of islets on the surface of pores and in the form of spherical particles of different sizes.  Carbon particles present a set of aggregates from chaotic graphene clusters. On surface of carbon particles is formed grapheme oxide. Obtained results show that the carbonized ceramics  adsorbs in a good degree the dyes from water solution.
ASSESSMENT OF SEASONAL PHYSICO-CHEMICAL PARAMETERS OF OGUTA LAKE, NIGERIA.
Authors: L.N Ukiwe , Nwoko C.I.A , Egereonu U.U. , Ukachukwu S.N.
Published: May 2018

Seasonal variation of physico-chemical variables of Oguta Lake, Nigeria was studied. Results obtained using standard analytical methods indicated that in the rainy and dry seasons (July and August) and (October and November), 2014, iron (Fe; 1.401 mg/l in November) was the overall metal observed in the lake, while mercury (Hg) was not detected throughout the period of study. Heavy metals concentrations observed were higher (not significantly) during the dry than the rainy season. The values observed for dissolved oxygen (DO), biological and chemical oxygen demand (BOD and COD) were within WHO permissible limits. The above evidence revealed that there was signs of heavy metal (Fe) pollution of the lake, and steps must be taking for constant monitoring of anthropogenic inputs into the lake.
Removing of heavymetals from water by chitosan nanoparticles
Authors: Abd-Elhakeem Mohamed Ahmed , M. Ramadan Maha , S. Basaad Faisal
Published: May 2018

Chitosan was prepared by deacetylation of chitin. The prepared chitosan has characterized bymolecular weight, degree of deacetylation, and ash %. Chitosan nanoparticles were prepared byionotropic gelation of chitosan with tripolyphosphate anions. The structure and particle size of chitosan nanoparticles have confirmed via FTIR analysis and TEM imaging.The chitosan nanoparticles were used in water treatment to remove metal ions from sample contains 20 ppm from each Fe+2, Mn+2, Zn+2 and Cu+2.The optimum conditions for this study were at 2 g/l of chitosan nanoparticles, pH 7 and 30 min of mixing time. Chitosan showed the highest performance under these conditions with removing percent 99.94% 80.85% 90.49% and 95.93% from Fe+2, Mn+2, Zn+2 and Cu+2 respectively.
Pb2+ Selectivity of Two New Mono Pyrene Acetamide Calix[4]arenes
Authors: Baklouti Lassaad , Aroua Rahma , Mannai Slim , J. Chetcuti Michael , Hamdi Abdelwaheb
Published: May 2018

The synthesis of a new mono tert-butyl ester mono pyrene acetamide calix[4]arene 2 and 5,11,17,23-tetra(tert-butyl)-25-pyrene acetamide-27-acid calix[4]arene 3, that both present pyrene fluorescent functionalities is reported. The binding properties towards a variety of transition and non-transition metal cations have been determined along with a fluorescence study. Particular selectivity to lead cations was observed
SYNTHESIS AND CHARACTERIZATION OFGOLDNANOPARTICLESUSING CEFOTAXIMSODIUM AND ITS SCHIFF BASE DERIVATIVE WITH 4-N,N-DIMETHYLAMINO BENSALDEHYDEAS REDUCING ANDSTABILIZING AGENTS
Authors: J. Abdulghani Prof. Dr. Ahlam , Hussain Rasha Kudher
Published: May 2018

Conjugated GNPs were synthesized  by one step reaction of AuCl4- with   cefotaxim  (CFX) and its Schiff base derivative with 4-N,N-dimethylamino benzaldehyde [sodium 3-(acetoxymethyl)-7-((2Z)-2-(2-(4-dimethylamino) benzylideneamino) thiazol-4-yl)-2-(methoxyimino) acetamido)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate] (SCFX)without the need of  reducing and functionalizing agents. The reduction process was monitored by uv-visible spectrophotometry  and the synthesized GNPs were characterized by TEM, SEM, AFM and  XRD analysis. The conjugation of GNPs with the two ligands was characterized by FTIR spectrophotometry. The size, morphology, and stability of GNPs were varied with concentration ratio of ligand/Au(III), pH medium and reaction temperature
COMPLEXATION OF POLYETHYLENE-GLYCOL WITH THE SODIUM SALTS OF CITRIC AND SUCCINIC ACIDS IN THE AQUEOUS SOLUTIONS. STUDIES BY DYNAMIC LIGHT SCATTERING AND UV/VIS SPECTROPHOTOMETRY
Authors: Masimov E.A. , Ismailov Etibar Hummat , Odzhaqverdiyeva S.Y.
Published: May 2018

Dynamic light scattering (DLS) method in combination with the UV/VIS spectrophotometry is used to study the interaction of polyethylene- glycols with a molecular weight  6000 ( PEG6000 ) with sodium salts of citric and succinic acids in aqueous solutions. The values of density, viscosity, refractive and diffusion indexes, the values of the hydrodynamic diameter, wavelength electronic absorption bands for PEG6000 aqueous solutions, their mixtures with succinic and citric acids are determined. It was shown that depending on the composition of the solutions the values of hydrodynamic diameter for aqueous solutions containing 1-5 wt.% PEG6000 and their mixtures with succinic and citric acids (~ 1 wt%) ranges from 3.6 to 5.2 nm. It is assumed that the formation of complexes with the sizes  that are within the above range is due to the features of interaction  and the structure of the complexes formed in solution.
The Theta polynomial Θ(G,x) and the Theta index Θ(G) of molecular graph Polycyclic Aromatic Hydrocarbons PAHk
Authors: Gao Wei , FARAHANI MOHAMMAD REZA
Published: May 2018

The omega polynomial Ω(G,x), for counting qoc strips in molecular graph G was defined by Diudea as  with m(G,c), being the number of qoc strips of length c. The Theta polynomial Θ(G,x) and the Theta index Θ(G) of a molecular graph G were defined as Θ(G,x)= and Θ(G)=, respectively.In this paper, we compute the Theta polynomial Θ(G,x) and the Theta index Θ(G) of molecular graph Polycyclic Aromatic Hydrocarbons PAHk, for all positive integer number k.
Investigation of the nanocrytalline SnO2 Synthesized by Homogeneous Precipitation
Authors: Abdel-Salam Mahmoud. N. , Abdel-Rahim M. A. , Gaber A. , Abdel-Latief A. Y.
Published: May 2018

Nanocrystalline tin dioxide synthesized by the homogeneous pre cipitation method using the reaction of tin tetrachloride pentahydrate and urea solutions has been investigated. The nanocrystalline powder has been traced at different calcination temperatures (300ºC-1050ºC), and then characterized by using   Thermogravemetric analysis, differential thermal analysis and x-ray diffraction. The microstructure of the obtained nanoparticles has been examined by scanning and transmission electron microscopy. The average crystallite size, determined by x-ray diffraction, was found to be in the range of 3 –30 nm. The analysis exhibited a tetragonal phase.  Optical properties were investigated by a UV–vis absorption spectrophotometer. The calculated optical band gap lies between 4.47–3.71 eV as a result of increasing the calcination temperatures and crystallite size. Surface area and porosity of SnO2 nanoparticles are measured. Specific surface area which is related to pore volume and decreases from 155 m2/g at 100ºC to 3.3 m2/g at 1050ºC.
Automatic Threshold Selections by exploration and exploitation of optimization algorithm in Record Deduplication
Authors: Deepa K. , Vivek C. , Rajan S.Palanivel
Published: May 2018

A deduplication process uses similarity function to identify the two entries are duplicate or not by setting the threshold.  This threshold setting is an important issue to achieve more accuracy and it relies more on human intervention. Swarm Intelligence algorithm such as PSO and ABC have been used for automatic detection of threshold to find the duplicate records. Though the algorithms performed well there is still an insufficiency regarding the solution search equation, which is used to generate new candidate solutions based on the information of previous solutions.  The proposed work addressed two problems: first to find the optimal equation using Genetic Algorithm(GA) and next it adopts an modified  Artificial Bee Colony (ABC) to get the optimal threshold to detect the duplicate records more accurately and also it reduces human intervention. CORA dataset is considered to analyze the proposed algorithm.
Photoluminescence, laser damage threshold, optical transmittance, FTIR, mechanical, dielectric, thermal and XRD studies on Bis – Glycine hydrochloride single crystal
Authors: Gobinathan L. , Boopathy K.
Published: May 2018

Single crystals of Bis – glycine hydrochloride (BGHC) were grown from aqueous solution by means of slow evaporation and slow cooling techniques. Single crystal XRD study reveals that the grown BGHC crystallizes in orthorhombic system with  space group P212121 and  the obtained unit cell parameters are a = 5.32 Å, b = 8.10 Å and c = 18.01 Å. Powder X – ray diffraction pattern of grown BGHC has been indexed. Functional groups present in the BGHC crystals were identified by FT – IR spectral analysis. The transmission and absorption spectra for the grown BGHC crystal shows that the lower cut off wavelength lies at 235 nm. The photoluminescence spectrum of the grown crystal was recorded. Mechanical hardness of the grown BGHC was determined and Vickers microhardness hardness number was calculated. Laser damage threshold study was carried out for the grown crystal using Nd:YAG laser. The thermal stability of the grown crystal was investigated using thermogravimetric analysis and the grown crystal is thermally stable up to 198 °C. Particle size dependent second harmonic generation efficiency of the grown crystal was examined by Kurtz and Perry powder technique using 1064 nm laser.
Experimental investigations on Thermal Performance of Copper with Aluminium Based Finned Heat sinks for Electronics Cooling System
Authors: Loganathan Arulmurugan , Mani Ilangkumaran
Published: May 2018

An Experimental investigation on the thermal performance of copper with aluminium based finned heat sinks for electronics cooling system was studied. The heat sinks have different material proportions containing major constituent of aluminium and minor constituent of copper. Considered with straight finned heat sink for the experiments for its easiness in fabrication and efficient heat transfer properties. The observational results for aluminium with copper alloy are compared with pure aluminium heat sink.  Heat sink geometry, fin pitch and its height were taken from the commercially available heat sinks. In this research work best heat sink geometry is chosen and cooked up with different volume of copper added with aluminium. Selected four different spots of heat sinks and the temperature raising characteristics were measured for natural convection. also the temperature is raised to a fixed temperature and the temperature lowering characteristics were measured in forced convection as the air circulation takes more heat to keep the heat sink temperature within the desired level.
TiO2- CuI Nanoparticle /Ru Solid State Dye-Sensitize Solar Cells
Authors: Taha Samar , Al-Dabag Samer. Y. , Ahmed Sudad. S. , Taher Wasan. J.
Published: May 2018

In this work  solid state dye sensitized solar cell (SSDSSC) type  (ITO / TiO2/ Ru / CuI / Ag) is fabricated. The thin films are prepared by pulse laser deposition (PLD) technique under the vacuum pressure of 3×10−3 mbar and annelid at 450 oC. In this technique  Nd:YAG laser at 1064 nm wavelength with (200 , 500 , 800) pulsed was used. It was noticed from (I-V) characteristics of the solar cell that  the photocurrent  collected  from  the  TiO2  (NP)  is increase as the number of  laser pulses increase. The conversion efficiency of TiO2 is increased  from 2.115%  up  to  5.654% and for CuI from 1.73 % to 5.19 % when the number of pulses increase from 200 up to 800.
INTRODUCTION TO HUMAN PHYSIOLOGY FOR MEDICAL STUDENTS
Authors: Shokr Elsayed
Published: May 2018

With recent advances in the fielded of human physiology, it has become urgent to provide an up to date review in the subject of human physiology.This book to help medical student in understanding modern human physiology. It presents the whole subject in brief comprehensive and up to date form.I hope this book will be a real help to undergraduate medical students, as well as to postgraduate and candidates of higher degree, in the field of human physiology.
PHOTOCATALYTIC EFFICIENCY OF TiO2 IN BIOTEMPLATES FORM IN THE DECOLORATION OF ORGANIC DYE AND INHIBITION OF E. COLI GROWTH
Authors: Silvestri Siara
Published: May 2018

Anatase TiO2 is widely used for pollutant degradation due to its photocatalytic property. Exposure of the surface to UV radiation (sunlight or artificial) generates an electron-hole pair that is responsible for the formation of free radicals such as O2•−in the presence of atmospheric oxygen and HO• in the presence of water. Biomorphic TiO2 plates were produced by infiltration of paper with titanium isopropoxide (TTiP) solution followed by hydrolysis in NH4OH and calcination at temperatures up to 600-1000 ºC, as a new way of fixing TiO2 with the aim of delaying the phase transition from anatase (photoactive) to rutile (inactive). In order to study the effect of addition of zirconia as a dopant on the microstructure and the phase transition from anatase to rutile, the same procedure was used, but with the addition of 5% (m/m) of ZrO(NO3)2 to TTiP. The biomorphic materials were characterized by XRD, specific surface area measurement (using the BET method), EPR, and SEM. Their photocatalytic efficiencies were evaluated in the decoloration of Orange II dye and the inhibition of growth of E. coli bioluminescent bacteria. Using 5% Zr-doped TTiP, with calcination at 800 ºC, bacterial growth was reduced by 23% after 180 minutes, and 70% dye decoloration was achieved in30 hours.
EVALUATION OF GROUNDWATER QUALITY OF SIWA OASIS
Authors: Ashour Ammar Mohammad , Wassel M.A. , Sayed A. Z. , EL-Fadl M.M. Abo , Mahmod A.M.
Published: May 2018

In discussing the water quality evaluation for use in different purposes, the author will briefly examine some of the major important water quality standards. These standards serve as a basis for appraisal of the results of chemical water analysis in terms of suitability of the water for various intended uses. According to total dissolved salts (TDS),  major  ions as cations ( Ca2+, Mg2+, Na+, K+), anions (CO₃2⁻, HCO₃⁻  ,SO₄2⁻, Cl⁻), with some heavy metals such as Al3+, B3+ , Cd2+, Co2+, Cr3+, Cu2+, Fe3+, Mn2+,  Mo2+, Ni2+,  Pb2+, Sr2+, V2+   and Zn2+  The results  indicate  that  the samples of Nubian sandstone aquifer is suitable for drinking of human and livestock , suitable for laundry purposes and for irrigation. While the samples of Fractured dolomite limestone aquifer are unsuitable for drinking and irrigation.
Synthesis and characterization of some new ruthenium (II) complexes as photosensitizers in dye-sensitized solar cells
Authors: Osman Ahmed H. , El-Said Waleed A. , El-Shakour M. Abd
Published: May 2018

New ruthenium (II) complexes, [Ru(DHZ)2(bpy)], [Ru(SCN)2(bpy)(DMSO)2], [Ru(SCN)2(dmbpy)(DMSO)2] and [RuCl2(salen)]-2, where bpy = 2,2'- bipyridine, DHZ = 1,5-diphenylthiocarbazone, dmbpy = 4,4'-dimethyl-2,2' bipyridine and salen = 2,2'- ethylenebis(nitrilomethylidene)diphenol were synthesized and characterized by elemental analysis, FTIR, UV-Vis spectroscopy and thermal analysis. From data of these investigations the structural formula and the mode of bonding were obtained. These complexes were successfully applied to sensitization of nano-crystalline TiO2 based solar cells (DSSCs). The photovoltaic efficiencies of the studied DSSCs increase in the following order [Ru(DHZ)2(bpy)]< [Ru(SCN)2(bpy)(DMSO)2]< [Ru(SCN)2(dmbpy)(DMSO)2]< [RuCl2(salen)]-2. This increase is in agreement with the light harvesting of these complexes as indicated from their absorption spectra. Ferrioxalate complex enhanced the performance of some investigated cells. Therefore, a mechanism of this improvement has been postulated. Polyaniline as well as iodine doped polyaniline modified FTO electrode has been tested as promising counter electrodes. The efficiencies of the cells using iodine doped polyaniline is higher than that of polyaniline, which is assignable to the high conductivity of iodine.
Study of physico-chemical characteristics of nickel insertion in phosphogypsum
Authors: Nafai H. , Lamzougui G. , Bouhaouss A. , Bchitou R.
Published: May 2018

The main purpose of this work is study the influence of the insertion metal ions Ni (II) in the phosphogypsum produced by sulfuric acid attack of tricalcium phosphate. Indeed, the maximum content of heavy metals calcium sulfate that can absorb was determined. The added ions are (NiCl2, 6H2O) with mass concentrations ranging from 5% to 50%. The samples prepared were characterized by various methods, such as X-ray diffraction (XRD), infrared spectroscopy and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The results of this study showed that the limit of insertion of metal cations in calcium sulfate is limited to 30% for nickel.
Corrosion Inhibition of Zinc Using Some Phenylthiazole Derivatives in Hydrochloric acid Solutions
Authors: Fouda Abdel Aziz , Nazeerb A. Abdel , Khalek K.M.Abdel
Published: May 2018

The inhibitive action of some phenylthiazole derivatives namely: 2-acetylamino-5-p-bromophenylazo-4-phenylthiazole (BPT), 2-acetylamino-5-p-methylphenylazo-4-phenylthiazole (MPT), 2-acetylamino-5-p-methoxyphenylazo-4-phenylthiazole (XPT) and 2-acetylamino-5-p-nitrophenylazo-4-phenylthiazole (NPT), on zinc corrosion in 0.2 M HCl  has been studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS)and electrochemical frequency modulation (EFM) measurements. The results showed that the dissolution rate of zinc decreases with increasing the phenylthiazole derivatives concentration and decreases with raising temperature. Polarization curves indicated that the studied inhibitors act as mixed-type inhibitors. The adsorption of the investigated compounds follows Langmuir adsorption isotherm model. The thermodynamic parameters of adsorption and corrosion processes were determined and discussed.
Novel cyclic voltammetry behavior of 3-((benzothiazol-2- diazenylnaphthalene-2,7-diol and use it for spectrophotometric determination of copper (II )in honey sample
Authors: Khazaal Fatma .A. , Mohammed Hussein. J. , M.Radhi Muhammed .
Published: May 2018

The azo reagent 3-((benzothiazol-2-diazenylnaphthalene-2,7-diol] was synthesized and characterized by FT-IR ,1H-NMRand 13CNMR spectral techniques. The electrochemical behavior of the azo reagent and its complex with Cu (II) has beenstudied at glassy carbon disk GCE electrode in different supporting electrolyte at concentration (1M) and scan rate(100mv.s-1). Spectrophotometric determination of copper (II ) is based on the formation of a 2:1 complex with abovereagent. The complex has Î»max at(588) nm and Ômax of( 1.436x104)L.mol-1.cm-1 .A linear correlation (0.1 â€“ 3.0 Î¼g. ml-1) was found between absorbance at Î»max and concentration . The effect of diverseions on the determination of copper (II) to investigate the selectivity of the method were also studied . The stabilityconstant of the product was (1.1x108 ) . The proposed method was successfully applied to the analysis of honey sample .
Benzo[c]phenanthrene derivatives: Synthesis, optical properties and cytotoxic activity
Authors: Guédouar Habiba , Aloui Faouzi , Ben hassine Bechir
Published: May 2018

A new benzo[c]phenanthrene ketone has been synthesized through Heck coupling and oxidative photocyclization. The optical properties of the target tetracyclic system were also investigated by UV-visible absorption and photoluminescence spectroscopy and an emission in the visible region was observed. The tetracyclic ketone has been reacted with primary amines in the presence of Lewis acid followed by NaBH4 reduction to provide new polyaromatic secondary amines in good yields and purity. All the synthesized new compounds were identified and characterized through a combination of nuclear magnetic resonance spectroscopy and mass spectrometric methods. The cytotoxic activity of all pure benzo[c]phenanthrene derivatives has been evaluated against Hep-2 cell line using (MTT) colori­metric assay.
DESIGN, SYNTHESIS AND COX1/2 INHIBITORY ACTIVITY OF NEW QUINAZOLINE-5-ONE DERIVATIVES
Authors: Aboraia Ahmed S. , Hara Mohammed A. , Abdelrahman Mostafa H. , M. Amin Mohamed , El-Sabbaghab Osama I.
Published: May 2018

A new series of 1-(4-Acetylphenyl)-7,7-dimethyl-3-(substitutedphenyl)-1,2,3,4,7,8-octahydroquinazolin-5(6H)-ones (6-15) were synthesized and tested against COX-1 and COX-2 enzymes. Those compounds exhibited strong interaction at the COX-2 binding site and poor interaction at the COX-1 active site. Subjected to in vitro cyclooxygenase COX-1/COX-2 inhibition assay; most of the compounds especially compounds 6, 7, 12, 13, and 16 exhibited potent anti-inflammatory effects, selective COX-2 inhibition, with half-maximal inhibitor concentration (IC50) values of 0.22â€“1.42 Î¼M and selectivity index (SI) values of 6.16â€“14.18 compared with celecoxib (IC50 = 0.05 Î¼M and COX-2 SI: 296), diclofenac (IC50 = 0.8 Î¼M and COX-2 SI: 4.87), and indomethacin (IC50 = 0.49 Î¼M and COX-2 SI: 0.08) as reference drugs. Docking study has been carried out to confirm the binding affinity and selectivity of the most active compound (compound 6) to COX-2 enzyme.
Synthesis , spectroscopic characterization and biological study of some new Schiff bases based on 2-hydroxybenzadehyde
Authors: Abdelnabi S. , Bkhakh Chasib K. , Kadhum Mouayed Y.
Published: May 2018

Four new Schiff bases were synthesized from condensation of aldehyde ( 2-hydroxy benzaldehyde ) with aromatic amines (4-introaniline ; 4,4-oxydianiline ; 4,4-diaminodipleny sulfone and sulfanilamide) . These Schiff bases were characterized by IR, NMR , GC. mass and element analysis. Moreover, the Schiff bases were screened for their antibacterial and antifungal activity against various microorganisms and compared with standard compounds. In general , the results were indicated that some Schiff bases had good antimicrobial activity.
Novel Analytical Study For The Charge-Transfer Reactions Of Omeprazole With 2,3-Dichloro-Naphthoquinone And 2,3,5,6-Tetrabromo- 1,4-Benzoquinone: Application For The Development Of Microwell Assay Of Omeprazole
Authors: Alkahtania Saad A , Mahmoud Ashraf M , Al-Rubb Samer S. Abu
Published: May 2018

Novel analytical study was performed in order to develop and validate new high-throughput microwell-based spectrophotometric assays for determination of omeprazole (OMZ) in its pharmaceutical formulations. The proposed assays were based on the charge-transfer (CT) reaction of OMZ with 2,3-dichloronaphthoquinone (DCNQ) and 2,3,5,6-tetrabromo-1,4-benzo-quinone (BROM). In the present study, the CT reactions was carried out in microwell plates as reaction vessels in order to increase the automation of the assays and the efficiency of its use in quality control laboratories (QCLs). All factors affecting the CT reactions were carefully studied, and the conditions were optimized. Kinetics and stoichiometry of the CT reactions were investigated, and the mechanism was postulated. Activation energy of the CT reactions was determined and found to be 13.87 and 16.27 Kcal molâˆ’1 for the reaction of OMZ with DCNQ and BROM, respectively. The initial rate and fixed time methods were applied for generating the calibration graphs for determination of OMZ concentrations. Under the optimum conditions, the linear range was 0.145 â€“ 1.45 x 10-4 and 1.45 â€“ 7.25 x 10-4 M with LOD of 0.6 and 6.0 microgram ml-1 for DCNQ and BROM, respectively. Analytical performance of the proposed methods, in terms of accuracy and precision, was statistically validated and the results were satisfactory; RSD was <2.8% for both repeatability and reproducibility. The proposed methods were successfully applied to the analysis of OMZ in its dosage forms and the recovery results (98.64 â€“ 100.6 Â± 0.25 -2.74 %) were comparable with those of the reported method. The developed method may provide a safer and economic tool for the analysis of OMZ in QCLs.
Dinuclear UO2(VI), Th(IV), ZrO(IV) and VO(IV) complexes based on some Schiff-base ligands: Synthesis and structural elucidation
Authors: Mohapatra Ranjan K. , Ghosh S. , Naik P. , Dash D. C.
Published: May 2018

A series of homo binuclear complexs of the type [M2(L/L’)(NO3)n(H2O)2], [where M=UO22+, Th4+, ZrO2+] and [(VO)2(L/L’)(SO4)(H2O)], L= 4, 17-di(o-hydroxyphenyl)-5,6,9,12,15,16-hexaaza-7,8,13,14-tetraphenyl heptadec-4, 6, 8, 12, 14, 16-hexene or L’= 10:11-benzo-4, 17-di(o-hydroxyphenyl)-5,6,9,12,15,16-hexaaza-7,8,13,14-tetraphenyl heptadec-4, 6, 8, 12, 14, 16-hexene, n=2 for UO22+, ZrO2+  n=6 for Th4+, have been synthesized in template method from ethylenediamine/orthophenylene diamine, benzil monohydrazone and salicyldehyde and characterized on the basis of elemental analysis, thermal analysis, molar conductivity, magnetic moment, electronic, infrared, 1H-NMR studies.  The results indicate that the VO(IV) ion is penta co-ordinated yielding paramagnetic complexes; UO2(VI), ZrO(IV) ions are hexa co-ordinated where as Th(IV) ion is octa co-ordinated yielding diamagnetic complexes of above composition.