bluuebunny/crossref_metadata_2025 huggingface dataset:
Determination of Physicochemical Characteristics of Early Rain Water in a Rain Forest Region, Owerri, Nigeria.
Authors: C.I.A. Nwoko , Egereonu U.U. , Ukiwe L.N.
Published: May 2018

Analysis of physicochemical characteristics of samples of rain water collected from rain gauges at two sampling stations at Orji and Umuchima-Ihiagwa in Owerri, Nigeria revealed that rain water from sampling station, Orji (RWSO) had the highest pH value (6.24), while values obtained for total suspended solids (14.23 mg/l-1), total dissolved solids (15.10 mg/l-1), calcium hardness (3.91 mg/l-1), and sulphate (11.23 mg/l-1) were highest for RWSO compared to values obtained from analysis of rain water sampling station, Umuchima (RWSU). However, it was observed that values obtained from nitrate analysis were almost equal (0.62, 0.60 mg/l-1 for RWSO and RWSU) for both sampling stations. Values obtained for the physicochemical parameters from both sampling stations were within World Health Organization (WHO) permissible standards for quality drinking-water.
About the correlation between the mobility of a polyion and that of its counterions
Authors: GHAZOUANI Anis. , BOUGHAMMOURA Sondes. , M'HALLA Jalel
Published: May 2018

In this paper, we propose a new approach in order to interpret the variation of the conductibility of the PSS polyion with the nature and the concentration of the alkaline counter-ions Li+, Na+ and K+, and the hydrophobic cations Et4N+ and Bu4N+. This approach is based on a recent model in which the stretched polyion is represented by a chain of successive charged spheres, partially condensed by the counter-ions. We have found that the moderate variation of the hydrodynamic friction on the polyion with the size RM of condensed counter-ions, cannot completely explain the important decrease (of about 35% from K+ to Bu4N+) of the conductibility (lPSS,M ) of the PSS polyion with the nature of the counter-ions. Consequently, we have proposed a supplementary explanation by taking into account of the translational dielectric friction on the moving polyion. Formal analysis of this friction shows that it is very sensitive to the local structure of water surrounding the polyions. As this local structure depends in its turn, on the nature of the condensed counter-ions; we suggested that this specific sensitivity could explain the high dependence of the mobility of the polyion with the nature of its counter-ions.
Azo-Hydrazone Tautomerism and Antimicrobial activity of New substituted Imidazolines and Perimidines
Authors: Farghaly Thoraya A , Abdallah Magda A. , Aziza Mohamed R. Abdel
Published: May 2018

Two new series of 2-{1-[(substitutedphenyl)-hydrazono]-2-oxo-2-phenyl-ethyl}-5,5-diphenyl-3,5-dihydro-imidazol-4-one  and  (1H-Perimidin-2-yl)-[(substitutedphenyl)-hydrazono]-acetic acid ethyl ester were prepared by coupling the diazonium salt of aniline and its derivatives with 2-(2-oxo-2-phenyl-ethylidene)-5,5-diphenyl-imidazolidin-4-one or ethyl 3-dimethylamino-2-(1H-perimidin-2-yl)-propenoate in ethanolic sodium hydroxide solution. The structures of all the newly synthesized compounds were confirmed by spectral (IR, 1H NMR, mass) spectra , and X-ray crystallographic and elemental analyses. Also, the azo-hydrazone tautomerism of these compounds was discussed. In addition, all the newly synthesized compounds were screened for their antibacterial and antifungal activity and the results obtained indicated that some of these compounds exhibited excellent activity.
Determination of Adsorption Isotherm model best fit for methanol leaf extract of Securinega virosa as corrosion inhibitor for corrosion of mild steel in HCl
Authors: Adejo S. O. , Ekwenchi M. M. , Gbertyo J. A. , Menengea T. , Ogbodo J. O.
Published: May 2018

The adsorption isotherm model best fit of the methanol leaf extract of Securinega virosa as corrosion inhibitor for the corrosion of mild steel in 2 M HCl medium was determined with the assistance of the Adejo-Ekwenchi adsorption isotherm. The corrosion inhibition study was carried out using the weight loss method at the temperature range of 301 K to 313 K.  The inhibition efficiency, %IE, of the extract was found to increase with increase in both concentration and temperature. On the account of, R2 this adsorption process well fitted into Langmuir, Freundlich, Temkin isotherm, Flory-Huggins and Adejo-Ekwenchi models. However, through the parameter b of the Adejo-Ekwenchi isotherm, which clearly shows the adsorption process to be chemisorption, the best isotherm fit for the extract has been resolved to be the Langmuir isotherm and Temkin isotherm models.
Validated Sensitive Spectrophotometric methods for Determination of Carvedilol and Nebivolol HCl in dosage forms.
Authors: Ibrahim Fawzia , El-Enany Nahed M , Shalan Shereen
Published: May 2018

A simple, sensitive and rapid spectrophotometric methods were developed and validated for the determination of two antihypertensive drugs namely, carvedilol and nebivolol hydrochloride in pure form and pharmaceutical formulations. Method (I) is based on the formation of a binary complex between the studied drugs and eosin Y in presence of tween 80 at (pH 3.0).The formed complex exhibited maximum absorption at 545 nm for carvedilol and 543 nm for nebivolol. The concentration plots were rectilinear over concentration range of 0.5-5 and 1-7 µg/mL with lower detection limits of 0.09 and 0.11µg/mL and lower quantitation limits of 0.28 and 0 .34 µg/mL for carvedilol and nebivolol respectively. Method (II) is based on the reaction of studied drugs through their secondary amino groups with 2, 4-dinitrofluorobenzene (DNFB) at pH 8 to form yellow colored reaction products peaking at 383 nm and 390 nm for carvedilol and nebivolol, respectively. The absorbance-concentration plots were rectilinear over the concentration ranges of 5-30 and 4-28 µg/ mLwith the lower detection limits of 0.48 and 0.51 µg/mL and the lower quantitation limits of 1.45 and 1.54 µg/mL for cavredilol and nebivolol respectively. The different experimental parameters affecting the development and stability of the formed complex and reaction products were carefully studied and optimized for both methods. Both methods were successfully applied for determination of the studied drugs in their dosage forms.
Exocyclic enaminones as building blocks for synthesis of bioactive polyheterocyclic compounds
Authors: Abdallah Magda A. , Farghaly Thoraya A. , Aziza Mohamed R. Abdel
Published: May 2018

The reaction of exocyclic enaminones namely, 2-(dimethylaminomethylene)-3,4-dihydro-2H-naphthalen-1-one,  3-(dimethylaminomethylene)-thiochroman-4-one and 2-(dimethyl-aminomethylene)-indane-1,3-dione, each with heterocyclic diazonium salts afforded the respective hydrazones which undergo either in situ dehydrative cyclization or cyclized by heating with acetic acid to give polycyclic compounds. The structure of all the newly synthesized products were confirmed by elemental and spectral (IR, IH NMR, Mass) data. Also, the biological activity of some of the prepared compounds was tested against some microorganisms and promising results were obtained.
ISOINDOLINOTRIAZOLE DERIVATIVES: SYNTHESIS BY THE AZIDE-ALKYNE CYCLOADDITION CLICK CHEMISTRY
Authors: Rakotoarivelo Nambinina V. , Najahi Ennaji , Perio Pierre
Published: May 2018

A novel series of isoindolinotriazole derivatives with different substituents in the triazole moiety were synthesized via copper-catalyzed cycloaddition (CuAAC) click chemistry between 2-(meta- or para-ethynylphenyl)-4,6-dimethoxyisoindolin-1-ones and several azides. The synthesized triazoles were characterized by IR, 1H NMR, 13C NMR and mass spectral techniques.
Synthesis, Characterization and biological evaluation of Novel Carboxamides, Oxadiazoles and Isoindoline-1,3-diones derived from 2-substituted phenylquinoline-4-carbohydrazides.
Authors: Tiwari Anil K. , Bishnoi Abha , Srivastava Amrita , Verma Anil Kumar , Fatma Shaheen , Tripathi Chandrakant M. , Banerjee Bikram
Published: May 2018

The new 2-arylquinoline-4-carboxylic acid derivatives 4(a-f) and 5(a-i), were tested by qualitative and quantitative methods on various bacterial and fungal strains and proved to be active at low concentrations against Gram-positive and Gram-negative bacteria as well as fungi. The MIC values were determined for test compounds as well as for reference standards. Compounds 4b and 5d showed better antibacterial and antifungal activity than clinically prevalent drugs (Gentamicin, Ampicillin and Fluconazole) against Staphylococcus aureus and Candida albicans. The structures of newly synthesized compounds have been characterized on the basis of their spectroscopic data. The study revealed the potential of newly synthesized compounds as a novel group of antimicrobials.
Comparative study of the chemical composition and biological activities of the essential oils of Senecio gallicus from Tunisia.
Authors: Mihoubi Mohamed , Mihoubi Wafa , Gargouri Ali , Jarraya Raoudha
Published: May 2018

The essential oils of flowers and remaining parts of the plant Senecio gallicus (Asteraceae), growing wild in Sfax (Tunisia), were obtained by hydrodistillation over a period of two years (2012 and 2013). Their analysis by Gas Chromatography-Mass Spectrometry (GC-MS), led to a total number of 36 components, belonging to different classes of chemical compounds. Oils compositions were characterized by the abundance of monoterpenes hydrocarbons, the major compounds present in flowers for the two years of study were  respectively the sabinene (49.45% and 28.86%), the α-pinene (9.67% and 9.1%), and the β-myrcene (9.88% and 10.97%). These compounds were also dominant in the essential oils of the plant without flowers where they represent (65.34% and 55%) for the sabinene, (4.14% and 7.3%) for α-pinene, and (6.86% and 0%) for β-myrcene. Obtained essential oils were tested for many biological activities and showed a moderate effect against the fungus Trichoderma reesei and bacteria such as Bacillus sp and Staphylococcus aureus. This study of the Senecio gallicus essential oils represents the first one in Tunisia.
Chemical Modification and Characterization of Yeast Cells for Extraction of Metal Ion in Water Sample
Authors: Ahmad Panahi Homayon
Published: May 2018

A novel biosorbent is prepared by coupling a cibacron blue to yeast cells. The chemically modified yeast cells with mentioned ligand has been characterized by Fourier transform infrared spectroscopy and elemental analysis and applied for the preconcentration and extraction of trace Ni(II) from water samples. The optimum pH value for sorption of the nickel ions was 8. The sorption capacity of yeast cells- cibacron blue is 12.2 mg. g−1. A recovery of 91.4% was obtained for Ni(II) when eluted with 0.5 M HCl/HNO3 (3:1). The equilibrium data of Ni(II) adsorption on yeast cells- cibacron blue was analyzed using Langmuir model. The method was applied for Ni(II) determination in sea water sample.
The Salts of Nitronic acid as CO2-Corrosion Inhibitors
Authors: V. M. Abbasov , L. I. Aliyeva , S. J. Haciyeva , N. I. Mursalov
Published: May 2018

The salts of nitronic acids were obtained by nitration of higher olefins, both normal and isomeric structure in the presence of aqueous alkali. The resulting salts (Na+, K+, NH4+), were tested in CO2 -media as a corrosion inhibitor. The results showed that, the protective effect of the linear nitronated olefins increases by increasing the number of carbon atoms. This is due to the fact that because of  the branched structure of the compounds, it is much more difficult to form a dense protective layer on the metal surface. 20% solutions of nitronated ethanolamine in isopropyl alcohol was synthesized and tested as corrosion inhibitor in carbon dioxide environments. The results showed that diethanolamine nitron based on a mixture of normal olefins C16-C18 at a concentration of 50 ppm has a high protective effect of  99.69%.
Synthesis, crystal structures and spectroscopic investigation of new Cu/Schiff-base complexes
Authors: Toumi Ahmed , Rzaigui Mohamed , Jannet Hichem Ben
Published: May 2018

Three novel Copper complexes, [Cu(L1)2][CuCl2] (1),  [Cu(L2)Cl] (2) and [Cu2(L3)3Cl2] (3), have been prepared by reaction of CuCl with the Schiff-base ligands L1: N,N’-bis(thiophen-2-ylmethylene)-ethane-1,2-diamine, L2: N,N’-bis(1H-pyrrol-2-ylmethylene)ethane-1,2-diamine and L3: N,N’-bis(2-nitrobenzylidene)-ethane-1,2-diamine in acetonitrile. The solid-state structures of these complexes were determined by X-ray diffraction from single crystal data and characterized by 1H and 13C NMR, IR and UV/Vis spectroscopies. This study shows that (1) is an ionic complex with a Cu(I)-centered cation and an isolated linear dichlorocuprate(I) anion, (3) is a dinuclear neutral complex of Cu(I) while (2)  is a mononuclear neutral complex of Cu(II). In the three complexes, Cu is tetracordinated in different geometrical environments. The atomic arrangements and spectroscopic properties of the three complexes are reported. Complexes 1-3 exhibit, in the solid state at room temperature, photoluminescence between 320 and 550 nm.
Synthesis, structure and characterization of a new noncentrosymmetric Zn(II) complex with the 2-amino-5-chloropyridine ligand (AClPy)
Authors: Nbili Wijdene , Kaabi Kamel , Ferretti Valeria , Lefebvre Frederic , Ben Nasr Cherif
Published: May 2018

A new noncentrosymmetric Zn(II) complex with the monodentate ligand 2-amino-5-chloropyridine (AClPy), ZnCl2(C5H5ClN2)2, has been prepared at room temperature and characterized by single crystal X-ray diffraction, 13C CP-MAS-NMR and IR spectroscopies. The basic coordination pattern of the AClPy coordinated metal cations is slighly distorted tetrahedral. The crystal structure is characterized by ZnCl2N2 tetrahedra interconnected via N-H···Cl hydrogen bonds generated by the NH2 amino group to form chains extending along the (a-c) direction. The exocyclic N atom is an electron receiving center, which is consistent with features of imino resonance as evidenced by bond lengths and angles. The crystal structure is stabilized by sets of intra and intermolecular hydrogen bonds. The 13C CP-MAS NMR spectrum is discussed and the vibrational absorption bands are identified by infrared spectroscopy and theoretical calculations.
Using 5-(4-aminoantipyrineazo)-8-hyrroxyquinoline as Complexometry Reagent with Cupper (II) and Zinc (II) Ions and its Biological Activity
Authors: A. Ali Asaad , Fahad Tarek Ali , Abdullah Wesam A.
Published: May 2018

The complexes of azo dye 5-(4-aminoantipyrineazo)-8-hyroxyquinoline (L) with cupper (II) and zinc (II) Ions were synthesized. Characterization of these azo dyes complexes have been done on the basis of elemental analysis and IR techniques. The work involves a study of optimum conditions (time, pH, sequence of addition and temperature effects) for forming the complexes. The spectra of the complexes have been studied for a range of concentrations which Lambert – Beer's law were obeyed with sensitivity of the spectrophotometric method in terms of molar absorptivity 1.6×104  and 1.2×104  l .mol-1.cm-1 for zinc and cupper azo dyes complexes respectively .The stoichiometry of the complexes has been found to be 1:2 (metal : ligand). The overall stability constants were determined by the corresponding solutions method. The interferences effects of the foreign ions were studied. The biological activity of two complexes with two type of Bacteria (Clostridium botulinum and Escherichia Coli) were also studied.
Bis(3-phenylpropylammonium) dichromate (VI): Synthesis, crystal structure and spectroscopy studies
Authors: Trabelsi Sonia , Roisnel Thierry , Marouani Houda
Published: May 2018

The structure of bis(3-Phenylpropylammonium) dichromate(VI) was determined from X-ray diffraction data. The compound crystallizes in the monoclinic system (space group P21/c) with the lattice parameters: a = 7.9379(2) Å, b = 36.2439(16) Å, c = 7.5753(3) Å; B = 96.069(2); V= 2167.20(14) Å3 and Z = 4. The structure was solved from 4959 independent reflections with R = 0.043 and Rw = 0.105. The structure consists of discrete dichromate anions (Cr2O72-) with eclipsed conformation stacked in layers parallel to (a, c) plane at y = 0 and ½. These anions are linked via the 3-phenylpropylammonium cations by N—H…O and C—H…O hydrogen bonds, forming a two-dimensional supramolecular network. Crystal structure and spectroscopic studies are reported for the bis(3-phenylpropylammonium) dichromate(VI).
ANTIMICROBIAL EVALUATION OF MALEIMIDE MONOMERS, HOMOPOLYMERS AND COPOLYMERS CONTAINING AZO, SULPHONAMIDE AND THIAZOLE GROUPS
Authors: Bapna Dr. Shivira , Hiran B.L. , Jain Sapna
Published: May 2018

New maleimide Monomers, homopolymers and copolymers  containing azo, sulfonamide and thiazole groups were synthesized. The structures of newly synthesized compounds have been characterized on the basis of their spectroscopic data (FT-IR and 1H-NMR).  Antimicrobial studies of synthesized compounds were performed using agar well diffusion method. All the compounds showed pronounced activity against bacterial strains in comparison to activity against fungal strains.The highest antibacterial potency was exhibited by the homopolymer HPSPMI against Escherichia coli, Klebsiella pneumoniae and Bacillus subtilis.  The activity of  HPSPMI against later two was more pronounced than the standard drug used. Only Selected compounds showed antifungal activity. Appreciable results were found against Aspergillus fumigates but not with Candida albicans. HPSPMI showed highest activity against Aspergillus fumigates. Surprisingly after homo and copolymerization, maximum compounds exhibited not only pronounced antibacterial activity but also antifungal activity.
EXTRACTION OF CRUDE ESSENTIAL FROM SENNA ALATA (POKOK GELENGGANG)
Authors: Wong Yee Ching , A. Razak Haziqah
Published: May 2018

Senna alata was one of the herbs plants that can be used to treat the ringworm in traditional method. In this study, the senna alata was scientifically tested to prove the traditional medicinal used. Six forms of extract were extracted by using soxhlet apparatus and continued with the appropriate methods that can extract the chemical compound of anthraquinone. The six forms of extraction included anthraquinone aglycone, anthraquinone glycoside, anthraquinone aglycone from glycoside, anthraquinone from crude absolute ethanol, anthraqunone from crude n-hexane and anthraquinone from crude ethanol 70%. The extraction of six forms of anthraquinone extract as antifungal was observed by tested with two types of fungi; Tricophyton rubrum and Microsporum gypseum. The extraction from crude absolute ethanol and crude n-hexane to inhibit these fungi were compared to determine which type of solvent was the best to use for inhibition. This test was implemented by using well-diffusion and broth microdilution method to determine the minimum inhibitory concentration (MIC). The present of six forms of anthraquinone was examined by using Thin-Layer Chromatography (TLC).
Spectrophotometric Determination of Certain Antiepileptic's in Tablets Using Vanillin Reagent
Authors: Mohammed Taghreed A. , Mohamed Mona A.
Published: May 2018

A selective and new spectrophotometric method is described for determination of three antiepileptic drugs; namely lamotrigine (LAM), gabapentin (GAB), and oxcarbazepine (OXC) in drug substances and in drug products using vanillin reagent as the chromogenic agent. The method is based on a coupling reaction between the cited drugs and vanillin reagent in acidic condition. Under optimized conditions, the yellow colored products were measured at 405, 396, and 400 nm respectively. Beer’s law was obeyed at (0.4 – 10), (0.1-10), and (0.5-11) μg/mL, and  the calculated molar absorptivity values are 2.52 x 104, 1.74 x 104, and 2.54 x 104 L/mol/cm for LAM, GAB, and OXC respectively. Sandell sensitivity, the limit of detection (LOD) and limit of quantification (LOQ) were calculated. No interference was observed from common additives found in drug products. The presented method was validated according to ICH guidelines. Statistical comparison of the results was performed using Student's t-test and F-ratio at 95% confidence level, and there was no significant difference between the reference and proposed method with regard to accuracy and precision. The method offers the advantages of rapidity, simplicity and sensitivity and low cost and can be easily applied to resource poor settings without the need for expensive instrumentation and reagents.
Effect the Temperature on Structure and Optical Properties for ZnS nanostructure Thin Film
Authors: Abbas Nada K. , Al- Rasoul Khalid T. , Shanan Zainb J.
Published: May 2018

ZnS nanocrystalline thin films by different temperature of reaction were prepared by chemical bath deposition using thiourea and zinc acetate as S2– and Zn2+ source. The optical absorption studies in the wavelength range 200–1100 nm show that band gap energy of samples 3.75 and 4.0 eV for different temperature reaction condition. The refractive index was estimated within the visible wavelength at 623 nm, it was 2.04 for sample 1 and its value will increase for sample 2 to be 2.55. The room temperature photoluminescence spectra of the films showed two peaks for all samples. We assigned the first peak due to band gap transitions while the latter was due to zinc vacancy in the films. Structural analysis using atomic force microscopy shows that the grain size for films were 73.2 and 87.34 nm. X-ray diffraction analysis indicates that both of them formed in the reaction bath have cubic zinc blende structure .The structural estimation shows variation in grain size 7nm and 20nm with different temperature reaction.
Synthesis and Biological activity of 1,3-Thiazolylidenehydrazinylidene ethylpyridiniumbromide monohydrate, 1,3-Thiazolylidenehydraziniumbromide and 1,3-Thiazolylidenehydrazine derivatives
Authors: Hassan Alaa A. , Mohamed Shaaban K. , Mohamed Nasr K. , El-Shaieb Kamal M. A. , Abdel-Aziz Ahmed T. , Rahman Marwa Rageh Abdel
Published: May 2018

1,3-Thiazolylidenehydrazinylidene ethylpyridinium bromide monohydrate, 1,3-thiazolylidenehydrazinium bromide and 1,3-thiazolylidenehydrazine derivatives were synthesized by heterocyclization of 2-(1-substituted ethylidene) hydrazinecarbothioamides, characterized and screened for their anti-bacterial activities. The structures of synthesized compounds were established by spectroscopic (IR, 1H, 13C-NMR, Mass) and X-ray analyses.
DYNAMIC LIGHT SCATTERING BY NANO- AND MICRO-SIZED COMPLEXES IN THE SYSTEM K2ReBr6/p-AMINOBENZOIC ACID/HBr/H2O
Authors: Osmanova S.N. , Kerimova U.A. , Osmanov N.S. , Ismailov E.H. , Suleymanova S.A.
Published: May 2018

K2ReBr6/p-aminobenzoic acid/HBr/H2O system using dynamic light scattering (DLS) and electronic absorption spectra (EAS) were studied. The formation of nano- and micro-sized complexes with hydrodynamic radius 0.001-2.8 µm within the temperature interval 293-333 K  and  as a function of concentration of hydrobromic acid and K2ReBr6/p-aminobenzoic acid ratio are shown.
INHIBITIVE ACTION OF IMIDAZOLES FOR COPPER CORROSION IN SULFURIC ACID MEDIUM
Authors: SOUMOUE A. , JMIAI A. , IBRAHIMI B. EL , ISSAMI S. EL , Bazzi Prof. Lahcen , HILALI M.
Published: May 2018

The corrosion inhibition of copper in the presence of 10-3 M of imidazole derivatives; Imidazole (IM), 2-Methyle imidazole (MIM), Benzimidazole (BIM) has been investigated in 1.0 M H2SO4 solution using  potentiodynamic  polarization and electrochemical impedance spectroscopy (EIS). Relationship between molecular structure and their inhibition efficiency was elucidated by quantum chemical calculations using the density functional theory (DFT) at the B3LYP/6-31+G(d,p) level. Inhibition efficiency of these compounds which has been evaluated via experimental methods was accorded with reported theoretical ones, and following the same order as BIM ˃ MIM ˃ IM.
Effect of Annealing Temperature on Physical Properties of Indium Doped Cadmium Oxide Thin Films
Authors: Abd Jinan A. , Al-Robayi Enas M. , Shanan Zainab J. , Habubi Nadir F.
Published: May 2018

Nanostructured indium doped CdO thin films were prepared by spray pyrolysis on glass substrate and annealed at 200-400 ᵒC for 1 hour. The structural, optical, and electrical properties of prepared films were studied using different techniques such as optical transmission, photoluminescence, X-ray diffraction, and Hall measurement. X-ray analysis shows that the In doped CdO films are preferentially orientated along (111) crystallographic directions. Increasing of annealing temperature increases the films packing density and reorient the crystallites along (1 1 1) plane.  The optical transmissions of all annealed films decreased with increasing annealing temperature. An increasing in the absorbance and photoluminescence spectra with increasing annealing temperature was denoted in all films. The band gap value of CdO:4%In equals to 2.5 eV and it decreases with annealing temperature and reaches of 2.45 eV for 400°C. The resistivity of annealed films decreased as annealing temperature increased. While high conductivity achieved in the present study is found to be 11.37 ×102 (Ω.cm)-1 for annealing at 400°C.
Spectroscopic Investiqation Complex Formation Of Vanadium Using 2,6-Dithiol-4-Methylphenol And HudrophobAmins
Authors: Kuliyev Kerim A.
Published: May 2018

Mixed-ligand complexes of Vanadium (IV, V) with 2,6-dithiol-4-methylphenol (DTMP) and hydrofobamins(Am) have been studied by spectrophotometry. Extraction of mixed ligand complexes is maximal at pH 3.8-5.3. The optimal conditions for the formation and extraction of mixed-ligand compounds have been found and the ratios of components I the complexes have been determined. The Beer’s law was applicable in the range of 0.04-3.6mg/ml.The method is free from common interferences. A procedure has been developed for extraction – spectro-photometric determination vanadium in soils andin oil and oil-products.
Ultrasound-promoted synthesis of novel dihydropyrido[2,3-d:5,6- d`]dipyrimidine derivatives
Authors: Mamaghani Manouchehr
Published: May 2018

An efficient synthesis of dihydropyrido[2,3-d:5,6-d`]pyrimidine derivatives was developed via one-pot three-component reaction of 6-amino-2-(alkylthio)-pyrimidine-4(3H)one and aryl aldehydes in the mixed solvent of glacial acetic acid and DMF (1:1, v:v) under ultrasonic irradiation. In this protocol novel fused dihydropyrido[2,3-d]pyrimidines were synthesized in high yields (80-97%) and lower reaction times (5-25 min).
Synthesis, Characterization and Antimicrobial Activity of Some Novel 1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile Derivatives
Authors: Mahdi Monther
Published: May 2018

The present research work deals with synthesize a series of various substituted benzothiazole containing 6-amino- 4-(substituted aryl)- tetrahydropyrano[2,3-c]pyrazole-5-carbonitrilic by reacting 2-mercaptobenzothiazole with hydrazine hydrate to synthesize hydrazine derivatives of benzothiazole (1), which then reacted with β- keto ester to develop pyrazole derivative (2), and then finally reacted with malononitrile and different aromatic aldehydes to obtain the final compounds (3a-3f). The structures of the intermediates and final compounds are assigned by using FTIR and 1H-NMR. The final compounds were screened for their antibacterial activity against four tested bacteria as G+ and G- using a well diffusion method. The results of antibacterial activity exhibited that the species Klebsiella pneumonia was the most effected types, while Pseudomonas aeruginosa was least the effected in general.
EVALUATION OF THE CHEMICAL COMPOSITION AND ALLELOPATHIC POTENTIAL OF ESSENTIAL OILS FROM THREE SPECIES OF ASTERECEAE AGAINST SEED GERMINATION AND SEEDLING VIGOR OF LETTUCE
Authors: Miranda Cíntia Alvarenga Santos Fraga de , Cardoso Maria das Graças , Carvalho Maria Laene Moreira de , Gomes Marcos De Sousa , Santiago Juliana De Andrade , Santiago Wilder Douglas , Teixeira Maria Luiza , Nelson David Lee
Published: May 2018

The allelopathic properties of the essential oils have been exploited because they are biodegradable natural compounds that can be used in combination or as prototypes for new bioherbicides. The objectives of this study were to chemically characterize the essential oils from B. dracunculifolia, C. bonariesis and T. diversifolia and to evaluate their allelopathic potential. The essential oils were extracted by hydrodistillation and their chemical compositions were determined by GC-MS. Allelopathic activities were determined by methods that evaluate the effects of volatile compounds and direct contact of those compounds on the seed germination and seedling vigor of lettuce. The principal constituents of the essential oil from B. dracunculifolia were limonene, trans-nerolidol and β-pinene; those in the oil from C. bonariesis were limonene, trans-β-ocimene and cis-verbenol (4.4%); and those in the oil from T. diversifolia were β-pinene, α-pinene and limonene. Minor differences in the germination and vigor of lettuce seedlings were observed when they were exposed to the volatile essential oils from the leaves of the three species of the Asteraceae family. However, upon direct contact with these oils, those of C. bonariesis presented the greatest allelopathic potential, which was attributed to its higher content of oxygenated monoterpenes.
DIRECT SYNTHESIS OF 1.4-CIS POLYBUTADIENE WITH APPLICATION OF HETEROGENIZED DITHIOSYSTEM.
Authors: Bagirov Gyulyara , Rafiyeva S.R. , Nasirov F.A. , Hasanova G.N. , Kuliyev A.D. , Tagiyeva A.M. , Janibayov N.F.
Published: May 2018

The problems of phosphorusulphurization of  mordenite, preparation of metalcomplex  dithiophosphates and results of their investigation as the heterogenized catalytic systems in combination with aluminum-organic  compounds in the polymerization process of butadiene are considered. It has been established that Ni- and Co-containing dithiosystem are the high-active and high-selective  catalysts  of  this pricess
Synthesis of nitrogen-containing phenol formaldehyde oligomers,grafted with vegetable oils
Authors: Amiraslanova M.N.
Published: May 2018

Synthesis of nitrogen-containing phenolformaldehyde oligomers (phfo), grafted with vegetable  oils is aimed at the acquisition of new range coating materials. Oil has been used as an example of soybean and linseed oils. The interaction  between phfo and vegetable oil is carried out by  means of functional groups as result of the oxidation prosesses on carbon atoms adjacent to the double bond and the functional groups,including oligomer macromolecules. Physical-chemical properties of nitrogen-containing as result of modification by means of benzoguanamine (bga)  monoalkyl (C8-C12)phfo, grafted with soybean oil is reflected. The probable structure  of the nitrogen-containing monoalkyl(C8-C12)phfo, grafted with soybean oil has been studied by means of NMR- and IR-spectroscopy methods. The mechanism of the occurrence of first and second stages of the process are described.
Spectroscopic characterization and cytotoxic activity of new metal complexes derived from (1E, N'Z, N'Z)-N',N'-bis(2-hydroxybenzylidene)-2-(naphthalen-1-yloxy) acetohydrazonohydrazide.
Authors: El-Tabl Abduo S. , Abd-El Wahed M. M. , Wahba M. A.
Published: May 2018

Spectroscopic (IR, 1H-NMR, UV-visible, mass and ESR spectra) and structural studies of the ligand (1E, N'Z, N'Z)-N', N'-bis (2-hydroxybenzylidene)-2-(naphthalen-1-yloxy) acetohydrazonohydrazide (H2L) and its metal complexes are reported. The magnetic properties and thermal analyses (DTA and TGA) were also carried out. The IR spectra of the prepared complexes suggested that, the ligand adopted either a bidentate or a tetradentate fashion, bonding to the metal ion through the azomethine nitrogens and the two phenolic oxygen atoms (ONNO). Electronic spectra and magnetic susceptibility measurements revealed an octahedral geometry for all complexes except sliver(I) complex (6), copper(II) complex (7) and cobalt(II) complex (11). The elemental analyses and mass spectral data have justified the ML, ML2 and M3L composition of the complexes. The ESR spectra of copper(II) complexes (5), (7), (12) and (16), showed an axial type (dx2-y2) ground state with a covalent bond character and also support the suggested structures of complexes. The antimicrobial activity as well as the cytotoxicity of the ligand and its metal complexes were investigated and discussed.
The Potential of Some Non-Conventional Vegetable Oils in Biodiesel Applications
Authors: Adekunle Abolanle S. , Oyekunle John A.O. , Tijani Basirat A. , Makinde WasiuO. , R. Obisesan Olaoluwa , Olabanji IyaboOluremi , Bello Muibat Olabisi
Published: May 2018

This work studied the potentials of some non-conventional oils biodiesel as an alternative to biodiesel made from a conventional seed oil (palm kernel oil), and petroleum-based diesel. The fruits of three non-conventional oilseeds, namely:PerseaAmericana (Avocado pear), Irvingiagabonenses (Dica nut) and Darcryodesedulis (Native pear)were obtained from local markets in Ile-Ife, Osun State Nigeria while petroleum-based diesel (PBD) used for comparative study was obtained commercially.The outer fleshylayers of the fruitswere separated from the seeds while both were air-dried for some days and later milled. The oils extracted from the milled samples were esterified to produce biodiesel usingmethanol in the presence of NaOH as catalyst. The biodiesels were analyzed for their fuel properties using standard methods.Results showed that the biodiesel yield ofIrvingiagabonensisoil diesel (IGOD),Darcryodesedulisoil diesel (DEOD) and Persia americanaoil diesel (PAOD) were94%, 82% and 96% respectively. These values compared favourably with that of palm kernel oil diesel (PKOD) (91%) produced under same conditions, and with the literature standard yield of 96.5% set for biodiesel. The pour pointsof PKOD, PAOD and DEOD were3, -6 and 1oC,respectively, with PAOD pour point very close to that of PBD (≥-10oC) obtained under similar experimental conditions. Except for IGOD, all the oils have pour points within the standard range of -15 to 16oC set for biodiesel suggesting the suitability of the oils for biodiesel applications.The iodine values of the biodiesel ranged between 9.64 and 16.52 meq/kg and agreed closely with 12-18 meq/kg reported in literature for PKOD. The biodiesel blend with PBD in the ratio 10:90, 20:80, 30:70 and 40:60 demonstratedimprovedphysico-chemical properties (including smoke point, flash point, cloud point, pour point, density, viscosity and acid value) that could meet the fluidity requirements for biodiesel applications.
PHYTOCHEMICALS, VITAMINS,MACRO AND MICRO ELEMENTS AND ANTIMICROBIAL ANALYSIS OF THE STEM BARK OF NAPOLEONA VOGELII(AKPAESU)
Authors: Onyrkwere Eze Sunday , Victoria Amajoh Chinwe
Published: May 2018

Sequel to the increasing application of plant materials in ethnomedicine and for nutritive purposes the phytochemicals, vitamins, macro and micro elements and antimicrobial analysis of the stem bark of Napoleonavogelii were undertaken using standard methods. The result shows that Napoleonavogeliicontains bioactive phytochemicals such as tannin (0.45±0.25%), phytosterols (12.53±0.25%), alkaloids (4.42±0.23%), flavonoids (9.27±0.18%), saponins (4.27±0.25%), hydrogen cyanide (0.37±0.20%). The vitamin analysis shows that the stem bark of Napoleonavogeliicontains vitamin A (1.20±0.03Mg/g), vitamin E (1.31±0.04 Mg/g), vitamin C (2.78±0.04 Mg/g), vitamin B1(7.20±0.05 Mg/g), vitamin B2 (0.90±0.31 Mg/g), vitamin B9(4.09±0.05 Mg/g), vitamin B3(1.27±0.25 Mg/g), vitamin B6(12.50±0.04 Mg/g)andvitaminB12(8.25±0.04Mg/g) in varying amounts while vitaminB5andvitaminB7wereabsent.Sodium(1247mg/kg),Calcium(2006mg/kg),Copper(1.23mg/kg),Phosphorous(410.22mg/kg), Iron(304.660mg/kg), Manganese(56.99mg/kg) and Zinc(2.69mg/kg) were the detectable mineral elements, Potassium (4996mg/kg) had the highest value while Arsenic and Nickel were below detection limit (0.001mg/kg).The result of the antimicrobial screening of the ethanol, butanol and chloroform extracts of the stem bark of Napoleonavogeliiagainst five pathogenic microbes, Escherichia coli, pseudomonas aeruginosa, streptococcus sp, Staphylococcus aureus, and Candida albicans shows that the butanol extract showed higher antimicrobial activities compared to the other extracts. Results from this study have shown that the stem bark of Napoleonavogeliicontains medicinal properties.
Direct Electrochemical Synthesis of Nickel (II) Thiolates and their Coordination Complexes.
Authors: Singh Baljit , Shavina Shavina
Published: May 2018

Metallo organic compounds can be synthesized electrochemically by anodic generation of metal cations by using sacrificial metal anode. Bis-thiolates complexes of Nickel, Ni(SR)2 have been prepared in an H-type cell by electrochemical oxidation of thiols RSH (ethanethiol, 2-propanethiol, 1-butanethiol, 1-pentanethiol and thiophenol) with sacrificial Nickel (Ni) anode and inert Platinum (Pt) cathode in non-aqueous solution of acetonitrile containing tetrabutylammonium chloride  (as supporting electrolyte). On refluxing   with ligand (L)  2,2'-bipyridyl, these thiolates do not form coordination compounds. However, their adducts Ni(SR)2.L have been synthesized electrochemically by adding the ligand to above thiols in solution phase. All these synthesized complexes have been characterized by elemental analysis, infrared spectral data and other physical measurements. All these compounds are in the solid state with excellent yield and associated with high electrochemical efficiency.
ENHANCED SUPERCAPACITIVE PERFORMANCE OF NANOCRYSTALLINE Mn3O4 SYNTHESIZED BY HYDROTHERMAL METHOD
Authors: Shaika Dadamiah PMD , Rosaiah P , Hussain O M
Published: May 2018

Mn3O4 nanoparticles have been successfully synthesized by a simple hydrothermal method at low temperatures. The processing conditions such as reaction temperature and time were optimized to synthesized phase pure nanocrystalline Mn3O4 with good electrochemical properties. The particles synthesized at a reaction temperature of 150°C for 12 h exhibited different characteristic peaks along with (211) predominant orientation which corresponds to tetragonal structure of Mn3O4 with space group I41/amd (141) and estimated crystallite size of 32 nm. The SEM analysis reveals that the octahedral shape of grains with an average grain size of 180 nm. The vibrational studies from Raman and FTIR measurements confirmed the microstructure and presence of Mn-O bonding. The conductivity of the product was increased with increasing temperature following the Arrhenius behavior with estimated activation energy of 0.37 eV. The supercapacitive performance of nanocrystalline Mn3O4 octahedrons in 1M Na2SO4 aqueous electrolyte exhibited a high specific capacitance of 348 Fg-1 at current density of 0.5 mAcm-2 and 70% capacitive retention even after 4000 cycles.
ANALYSIS OF OVARIAN DISEASES USING ULTRASOUND IMAGES
Authors: Sheikdavood K. , Rajan S. Palanivel
Published: May 2018

Ovarian disease is the most common disease occurring in female reproductive organs. The premature recognition and action needed for diagnosis the disease to avoid infertility or cancer to them. The reason behind infertility is Polycystic Ovary Syndrome (PCOS) and the Ovarian Regenerative Tissues Cells.  PCOS is the kind of endocrine disorder present in female’s ovary and creates problem with Irregular menstrual periods, skin diseases, excess hair growth in body and face, acne and finally infertility. For ovarian regenerative tissues cells histopathology slides can be well stored put away in digitized color image design. One of the well known determination inclinations to recognize ovarian tissues is ultrasound image scanner. In any case, because of various shape, size and color, distinguishing proof of ovarian tissues is a testing assignment for ultrasound scanners as it procedure dark scale images. In order to overcome these diseases, we proposed techniques for ultrasound images. By this techniques follicle in the ovary and the ovarian regenerative tissues cells is automatically detected.
Acid Attack on Concrete Containing Industrial Wastes
Authors: Brintha G Shiny , N Sakthieswaran
Published: May 2018

In this paper, the acid attack test is conducted on M30 grade concrete with industrial wastes. Here in this study, GGBSand metakaolin are partially replaced for cement and copper slag is replaced for sand. The simultaneous replacement ofthese materials is done in each mix. Totally five mixes were prepared including controlmix. GGBS and metakaolinreplacement vary from 5% to10% in successive mixes. Similarly the copper slag replacement ranges from 20 to 40%. Twotypes of acids such as Sulphuric Acid, Hydro chloric Acid with 1%concentration are used at 28 days immersion. From theresults, it is observed that the percentage loss of weight is least for the mix containing 5% GGBS, 5% Metakaolin and 20%copper slag. And also for the same mix, the compressive strength of 28 dayssulphuric acid curing is11.07% higher thanthe concrete with 28 days water curing. Similarly in hydro chloric acid immersion, the compressive strength of concrete is2.24% higher than the concrete with 28 days water curing. The reason for the acid resistance of concrete is the combinedeffect of GGBS, Metakaolin and copper slag.
X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2
Authors: Ayadi R. , Boujelbene Mohamed , Mhiri T.
Published: May 2018

The present paper is interested in the study of compounds from the apatite family with the general formula Ca10 (PO4)6A2. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatiteCa8 Gd2 (PO4)6O2 has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position.  Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.
Fourth Atom-Bond Connectivity Index of an Infinite Class of Nanostar Dendrimer D3[n]
Authors: Farahani Mohammad Reza
Published: May 2018

The atom-bond connectivity (ABC) index of a graph G is a connectivity topological index was defined as  where dv denotes the degree of vertex v of G. In 2010, M. Ghorbani et. al. introduced a new version of atom-bond connectivity index as  where  In this paper, we compute a cloused formula of ABC4 index of an infinite class of Nanostar Dendrimer D3[n]. A Dendrimer is an artificially manufactured or synthesized molecule built up from branched units called monomers.
VOICE RECOGNIZATION FOR MOUSE CONTROL USING HCI
Authors: Jamuna V. , Rajan S. Palanivel
Published: May 2018

One  of  the  most  important  research  areas  in  the  field  of  Human -Computer-Interaction (HCI) is gesture  recognition as it provides a natural and intuitive  way  to  communicate  between  people  and  machines.  Voice-based HCI applications range from computer applications to virtual/augmented reality and is recently being explored in other fields. This work proposes the implementation of absolute virtual mouse based on the interpretation of voice reorganization control. The procedure is to control the mouse pointer as for the mouse movement to up/down/left/right, open the file, dragging the file. This  virtual  device  is designed  specifically  as  an  alternative non-contact  pointer  for  people  with mobility impairments in the upper extremities. The implementation of the virtual mouse by voice control is to make HCI simplification for disabled persons especially for the person who are not having the hands and arms, and Alternative mouse cursor positioning system for laptops.
Adaptive scheme to Control Power Aware for PDR in Wireless Sensor Networks
Authors: Sivaranjini R. , Rajan S.Palanivel
Published: May 2018

Nowadays Wireless sensor networks playing vital role in all area. Which is used to sense the environmental monitoring, Temperature, Soil erosin etc. Low data delivery efficiency and high energy consumption are the inherent problems in Wireless Sensor Networks. Finding accurate data is more difficult and also it will leads to more expensive to collect all sensor readings. Clustering and prediction techniques, which exploit spatial and temporal correlation among the sensor data, provide opportunities for reducing the energy consumption of continuous sensor data collection and to achieve network energy efficiency and stability. So as we propose Dynamic scheme for energy consumption and data collection in wireless sensor networks by integrating adaptively enabling/disabling prediction scheme, sleep/awake method with dynamic scheme. Our framework is clustering based. A cluster head represents all sensor nodes within the region and collects data values from them. Our framework is general enough to incorporate many advanced features and we show how sleep/awake scheduling can be applied, which takes our framework approach to designing a practical dynamic algorithm for data aggregation, it avoids the need for rampant node-to-node propagation of aggregates, but rather it uses faster and more efficient cluster-to-cluster propagation. To the best of our knowledge, this is the first work adaptively enabling/disabling prediction scheme with dynamic scheme for clustering-based continuous data collection in sensor networks. When a cluster node fails because of energy depletion we need to choose alternative cluster head for that particular region. It will help to achieve less energy consumption. Our proposed models, analysis, and framework are validated via simulation and comparison with Static Cluster method in order to achieve better energy efficiency and PDR.
Concrete Incorporated With Silica Fume And Manufactured Sand Under Acidic Nature
Authors: Ruben J Sahaya
Published: May 2018

Now a dayAcid attack is growing threat to concrete structures. Using some alternate materials as partial replacement of cement and sand in the concrete is an important factor that enhances the performance of concrete in an aggressive environment. In this present study, the cement is replaced with silica fume by 10 % and the sand is replaced with manufactured sand up to 50%. The selection of these replacement materials involves a balance between economy and durability.The specimens are immersed in 2% concentration of both acids such as sulphuric acid and hydro chloric acid at 28 days. The grade of concrete is M30. From the results, it is observed that the concrete containing 10% silica fume and 40% manufactured sand has the better performance in acid environment.
Transesterification of Waste Cooking Oil Catalysed by Crystalline Copper Doped Zinc Oxide Nanocatalyst
Authors: R Sandhya , R Velavan , J Ravichandran
Published: May 2018

Biodiesel has its unique position in the field of renewable energy as alternate fuel to diesel due to fuel price, energy requirement and petroleum crisis. In this study, biodiesel was produced from Waste Cooking Oil (WCO) using Copper doped Zinc Oxide (CZO) nanocatalysts. The synthesized Copper doped Zinc Oxide nanocatalysts were characterized by X-Ray Diffraction (XRD) and High Resolution Transmission Electron Microscope (HRTEM). Design of experiment was framed using Taguchi method to limit the experiments and to find the optimum reaction conditions. The effect of process parameters such as oil-to-methanol ratio (O/M), catalyst type, catalyst concentration, temperature and time on the transesterification reactions using characterized Copper doped Zinc Oxide nanocatalyst were investigated. The 4% (weight /weight) nanocatalyst concentration, 1:5 Oil to methanol molar ratio at 60°C temperature and 40 minutes of reaction time were found to be optimum, in which the maximum biodiesel yield of 98 % (w/w) was obtained. Hence it was determined that nanocatalysts exhibited good catalytic activities on biodiesel production from Waste Cooking Oil (WCO).