Mithibai College

Mumbai, India

Mithibai College

Mumbai, India
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Nadkarni N.G.,Patkar College | Mangaonkar K.V.,Mithibai College
E-Journal of Chemistry | Year: 2011

Binary and ternary complexes of the type M-Y and M-X-Y [M = Mn(II), Ni(II), Cu(II) and Zn(II); X = 5-bromosalicylidene-4-methoxyaniline and Y = salicylidene-2,3-dimethylaniline] have been examined pH-metrically at 27±0.5 °C and at constant ionic strength, μ = 0.1 M (KCl) in 75 : 25(v/v) 1,4-dioxne-water medium. The stability constants for binary (M-Y) and ternary (M-X-Y) systems were calculated. © Copyright E-Journal of Chemistry 2004-2011.


Mapari A.K.,Ramnarain Ruia College | Mangaonkar K.V.,Mithibai College
International Journal of ChemTech Research | Year: 2011

Binary and ternary complexes of the type M-Y and M-X-Y [M = Co(II), Ni(II), Cu(II) and Zn(II); X = N-(2- hydroxybenzylidene)-2,3-dimethylaniline and Y = N-(2-hydroxy-1-naphthylidene)-4-chloroaniline] have been examined pH-metrically at 27 ± 0.5°C and at constant ionic strength, μ = 0.1 M (KCl) in 75: 25 (v/v) 1,4-dioxne-water medium. The stability constants for Binary (M-Y) and ternary (M-X-Y) systems were calculated.


Binary and ternary complexes of the type M-Y and M-X-Y [M = Co(II), Ni(II), Cu(II) and Zn(II); X = N-(2-hydroxy-1-naphthylidene)-2,6-diisopropylaniline and Y = N-(2-hydroxybenzylidene)-2,3-dimethylaniline] have been examined pH-metrically at 27±0.5 °C and μ = 0.1 M in 75: 25% (v/v) 1,4-dioxne-water medium. The logarithms of the values of stability constants for binary (M-Y) and for ternary (M-X-Y) systems were calculated.


Mapari A.K.,Ramnarain Ruia College | Mangaonkar K.V.,Mithibai College
E-Journal of Chemistry | Year: 2011

The mixed ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II) with Schiff bases N-(2-hydroxy-1-naphthylidene)-4-methylaniline (L1H) and N-(2-hydroxybenzylidene)-2,3-dimethylaniline (L2H) have been synthesized and characterized. The resulting complexes were characterized by elemental analysis, thermogravimetric analysis, magnetic moment measurements, conductivity measurements, 1H NMR, IR, UV-visible and ESR spectral studies. The Schiff bases acts as bidentate monobasic ligands, coordinating through deprotonated phenolic oxygen and azomethine nitrogen atoms. The complexes are non-electrolytic in DMSO. The presence of the two coordinated water molecules in these complexes was indicated by IR spectra and thermogravimetric analysis of the complexes. From the analytical and spectral data the stoichiometry of these complexes have been found to be [M(L1)(L2)(H2O) 2] {where M = Co(II) , Ni(II), Cu(II) and Zn(II)}. It is found that Co(II), Ni(II), Cu(II) and Zn(II) complexes exhibited octahedral geometry. The antimicrobial activities of ligands and their mixed ligand complexes were screened by disc diffusion method. It is found that the metal complexes have higher antimicrobial activity than the free ligand.


Binary and ternary complexes of the type M-Y and M-X-Y[M=Co(II), Ni(II), Cu(II) and Zn(II); X=N-(2-hydroxybenzylidene)-2,3-dimethylaniline and Y = N-(2-hydroxy-1-naphthylidene)-4-nitroaniline] have been examined pH-metrically at 27±0.5 °C and at constant ionic strength, μ=0.1 M (KCl) in 75:25 (v/v) 1,4-dioxne-water medium. The stability constants for binary (M-Y) and ternary (M-X-Y) systems were calculated.


Yele V.U.,University of Mumbai | Desai K.,Mithibai College
Applied Biochemistry and Biotechnology | Year: 2014

A new thermostable and solvent-tolerant lipase was isolated from newly isolated Staphylococcus warneri from oil-contaminated soil. Optimization of the fermentation media for production of thermostable and organic solvent-tolerant lipase was carried out using two statistical methods, i.e., Plackett–Burman design (PBD) and central composite design (CCD) were used for the optimization of the media components. PBD was used to efficiently select important medium components affecting the lipase production. Out of 15 medium components screened, four components, i.e., olive oil, peptone, maltose, and K2HPO4 were found to contribute positively to lipase production. CCD and response surface methodology (RSM) were used to determine the optimum levels of the selected components using Design-Expert 8.0 software. Production medium with olive oil (1.45 %), peptone (0.28 %), maltose (0.054 %), and K2HPO4 (0.091 %) was optimized with a maximum lipase production of 10.43 IU/ml/min. Similarly, production conditions for the lipase production were optimized by using CCD and RSM. Optimized conditions were found to have an incubation temperature of 55 °C, medium pH of 8.0, agitation of 120 rpm, and inoculum volume of 2 %. RSM revealed the maximum lipase production of 17.21 IU/ml using these optimized production conditions. Crude lipase showed enhanced activity in organic solvents such as diethyl ether, hexane, and cyclohexane. © 2014, Springer Science+Business Media New York.


Binary and ternary complexes of the type M-Y and M-X-Y [M = Mn(II), Ni(II), Cu(II) and Zn(II); X = salicylidene-4-methoxyaniline and Y=5-bromosalicylidene- 4-nitroaniline] have been examined pH-metrically at 27±0.5 °C and at constant ionic strength, μ = 0.1 M (KCl) in 75 : 25(v/v) 1,4-dioxne-water medium. The stability constants for binary (M-Y) and ternary (M-X-Y) systems were calculated. The relative stability (Δ log KT) values of the ternary complexes with corresponding binary complexes for all the metal(II) ions in the present study found to be negative indicating that ternary 1:1:1 (M-X-Y) complexes are less stable than binary 1:1 (M-Y) complexes. In the ternary system studied, the order of stability constants of mixed ligand complexes with respect to the metal ions was found to be Cu(II)>NI(II) >Mn(II)>Zn(II); which is same as in the corresponding binary (M-Y) systems. © Copyright E-Journal of Chemistry 2004-2011.


Gadkari D.,Mithibai College
Materials Chemistry and Physics | Year: 2013

Vertical directional solidification (VDS) technique is used on the combined growth principals of the conventional methods since 1994, which leads to the detached growth. For evaluation of the detached growth, five bulk ingots of indium doped gallium-antimonide GaSb:In (In = 0.5, 0.25, 0.15) have been grown-without the seed, without contact to the ampoule wall, without coating and without external pressure. The gap is attributed to compensate the differential thermal dilatation that is grown with the reduced diameter than the diameter of the ampoule. VDS experiments have been proved that the sum of the contact angle and growth angle is large enough to allow detachment without any additional pressure difference under the melt to offset hydrostatic pressure. A meniscus forms at the bottom of the melt, the capillarity effect establishes due to which spontaneous gap could be created by the melt free surface, thus no thermal shear stress and thermo-mechanical stresses at the interface. Detached grown bulk GaSb:In crystals showed superior crystal quality with the highest physical properties and mobility than the crystals grown ever. The axial and radial composition profile of the grown GaSb:In ingots showed variation ≤10%. From the conical region, dislocation density decreases in the growth direction and reaches less than 103 cm-2. © 2013 Elsevier B.V. All rights reserved.


Gadkari D.B.,Mithibai College
AIP Conference Proceedings | Year: 2013

Since 1994, vertical directional solidification (VDS) technique is based on the combined growth principal of the conventional methods, which leads to the detached growth and crystal perfection. InSb:Te bulk crystals grown under detachment showed the highest mobility and physical properties. It reveals the thermocapillary and composition control in Te doped InSb ingots by the influence of detached growth, where dislocation density has been reduced significantly. © 2013 American Institute of Physics.


Gala V.,Institute of Management Sciences | John N.,Institute of Management Sciences | Desai K.,Mithibai College
International Journal of Pharma and Bio Sciences | Year: 2013

Pseudomonas aeruginosa and Acinetobacter baumannii are common nosocomial pathogens, well recognized for their multidrug resistance. Acyl-homoserine lactone (Acyl-HSL) based Quorum sensing (QS) is known to regulate virulence and biofilm maturation in these organisms; hence, inhibition of QS will help to control their pathogenicity. In the study, 5 plants, Rubia cordifolia, Tinospora cordifolia, Picrorhiza kurroa, Cassia fistula and Bauhinia variegata were screened for QS inhibition. A comparison of different extracts from the above plants, for short and long acyl-HSL inhibition in both pathogens, was carried out using reporter strains, Chromobacterium violaceum ATCC12472 and Escherichia coli MG4/pKDT17 respectively. Ethyl acetate extracts of T. cordifolia inhibited short as well as long acyl-HSLs with about 78% & 71% inhibition of long acyl-HSLs in P. aeruginosa and A. baumannii respectively; higher than the positive control, garlic extract (29% and 33% respectively). Further, absence of antibacterial activity of the plant extract confirmed its QS inhibitory potential.

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