Agartala, India
Agartala, India

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Panigrahi S.,Anchal College | Pradhan M.K.,Anchal College | Panda D.K.,Womens College | Joshi P.N.,Anchal College
Photosynthetica | Year: 2015

The photosynthetic responses to elevated CO2 concentration (EC) at ambient and ambient + 4°C temperature were assessed in the second leaf of rice (Oryza sativa L.) seedlings. The duration of different leaf developmental phases, as characterised by changes in photosynthetic pigment contents and photochemical potential, was protracted in the seedlings grown under EC. On the other hand, a temporal shift in the phases of development with an early onset of senescence was observed in the seedlings grown under EC at ambient + 4°C temperature. The contents of carotenoids, β-carotene, and xanthophyll cycle pigments revealed that EC down-regulated the protective mechanism of photosynthetic apparatus against oxidative damages, whereas this mechanism assumed higher significance under EC at ambient + 4°C temperature. We observed an enhancement in electron transport activity, photochemical potential, and net photosynthesis in spite of a loss in photostasis of photosynthesis under EC. On the other hand, the loss in photostasis of photosynthesis was exacerbated under EC at ambient + 4°C temperature due to the decline in electron transport activity, photochemical potential, and net photosynthesis. © 2016 The Institute of Experimental Botany

Debnath P.,Tripura University | Chakraborty S.,Tripura University | Deb S.,Womens College | Nath J.,Tripura University | And 2 more authors.
Journal of Physical Chemistry C | Year: 2015

In the present Article, a reversible transition behavior from J-aggregates to excimer of an indocarbocyanine dye 1,1′-dioctadecyl-3,3,3′,3′-tetramethylindocarbocyanine perchlorate (DiI) in Langmuir-Blodgett (LB) films was reported. Surface pressure-area (π-A) isotherms, UV-vis, and fluorescence spectroscopies as well as atomic force microscopy (AFM) were used for characterizations of the films. π-A isotherms suggest a balance of interactions between DiI and fatty acids in the mixed monolayer at DiI mole fraction XDiI = 0.4, resulting in a stable and ideally mixed monolayer. It has been observed that pure DiI formed excimer in LB films, whereas both J aggregates and excimer were formed in LB films when DiI was mixed with long chain fatty acids, viz., stearic acid or arachidic acid. In fatty acid matrix at XDiI = 0.4, only J aggregates were formed in the LB films. This has been confirmed using deconvolution of spectroscopic results as well as using excitation spectroscopy. The coherent size of the J aggregate was found to be a maximum for the mixed film at the mole fraction 0.4 of DiI in fatty acid matrix. The J-aggregate domain in the LB film contains approximately (20 ± 5) coherent sizes. However, J aggregates were totally absent when DiI was mixed with cationic surfactant, polymer, or nanoclay. © 2015 American Chemical Society.

Banik S.,Womens College | Bhattacharjee J.,Tripura University | Hussain S.A.,Tripura University | Bhattacharjee D.,Tripura University
Journal of Physics and Chemistry of Solids | Year: 2015

Porphyrins have a general tendency to form aggregates in ultrathin films. Also electrostatic adsorption of cationic porphyrins onto anionic nano clay platelets results in the flattening of porphyrin moieties. The flattening is evidenced by the red-shifting of Soret band with respect to the aqueous solution. In the present communication, we have studied the clay induced aggregation behaviour of a tetra-cationic metalloporphyrin Manganese (III) 5, 10, 15, 20-tetra (4 pyridyl)-21 H, 23 H-porphine chloride tetrakis (methochloride) (MnTMPyP) in Layer-by-Layer (LbL) self assembled film. The adsorption of dye molecules onto nano clay platelets resulted in the flattening of the meso substituent groups of the dye chromophore. In Layer-by-Layer ultrathin film, the flattened porphyrin molecules tagged nano clay platelets were further associated to form porphyrin aggregates. This has been clearly demonstrated from the UV-vis absorption spectroscopic studies. Atomic Force Microscopic (AFM) studies gave visual evidence of the association of organo-clay hybrid molecules in the LbL film. © 2015 Elsevier Ltd.

Hussain S.A.,Tripura University | Banik S.,Tripura University | Banik S.,Womens College | Chakraborty S.,Tripura University | Bhattacharjee D.,Tripura University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2011

This work reports the adsorption kinetics of a highly fluorescent laser dye rhodamine B (RhB) in a preformed stearic acid (SA) Langmuir monolayer. The reaction kinetics was studied by surface pressure-time (π-t) curve at constant area and in situ fluorescence imaging microscopy (FIM). Increase in surface pressure (at constant area) with time as well as increase in surface coverage of monolayer film at air-water interface provide direct evidence for the interaction. ATR-FTIR spectra also supported the interaction and consequent complexation in the complex films. UV-vis absorption and Fluorescence spectra of the complex Langmuir-Blodgett (LB) films confirm the presence of RhB molecules in the complex films transferred onto solid substrates. The outcome of this work clearly shows successful incorporation of RhB molecules into SA matrix without changing the photophysical characteristics of the dye, thus making the dye material as LB compatible. © 2011 Elsevier B.V. All rights reserved.

Bhattacharjee J.,Tripura University | Banik S.,Womens College | Hussain S.A.,Tripura University | Bhattacharjee D.,Tripura University
Chemical Physics Letters | Year: 2015

In the present communication, interaction of tetracationic porphyrin, 5,10,15,10-tetrakis (1-methyl-4-pyrindino) porphyrin tetra (p-toluenesulfonate) (TMPyP) with anionic nano clay platelets laponite has been studied in aqueous clay dispersion and Layer-by-Layer (LbL) self assembled film. Electrostatic adsorption of TMPyP molecules on clay platelets resulted in the flattenening of meso-substituent groups which led to the development of a new adsorbed band in the UV-vis absorption spectra. J-band was also formed due to overlapped organizations of organo-clay hybrid molecules in the LbL film leading to J-aggregates. Atomic force microscopic (AFM) studies gave visual evidence of this favoured organization in the monolayer LbL film. © 2015 Elsevier B.V. All rights reserved.

Dwyer T.,University of Toronto | Dwyer T.,Womens College | Dwyer T.,Mount Sinai Hospital | Drexler M.,Mount Sinai Hospital | And 6 more authors.
Regional Anesthesia and Pain Medicine | Year: 2015

Many anesthesiologists may not be familiar with the rate of surgical neurological complications of the hip and knee procedures for which they are providing local anesthetic-based anesthesia and/or analgesia. Part 2 of this narrative review series on neurological complications of elective orthopedic surgery describes the mechanisms and likelihood of peripheral nerve injury associated with some of the most common hip and knee procedures, including arthroscopic hip and knee surgery and total hip and knee replacement. What's New As the popularity of regional anesthesia continues to increase with the development of ultrasound guidance, anesthesiologists should have a thoughtful understanding of the nerves at risk of surgical injury during elective hip and knee procedures. © 2015 American Society of Regional Anesthesia and Pain Medicine.

Durrani A.M.,Womens College
Indian journal of public health | Year: 2011

A cross-sectional study among 701 school children (12-16 years) was conducted in Aligarh to find out the prevalence of hypertension and to correlate school going adolescent's blood pressure with age, sex, height and weight. The weight was taken by a standardized weighing machine while height was measured using a standard stediometer. Blood pressure measurements were taken by a mercury sphygmomanometer. The distribution of blood pressure by anthropometric characteristics were studied. Mean, standard deviation and correlation coefficient were used for statistical analysis. The overall prevalence of hypertension was found to be 9.4%. Blood pressure of both gender appear to have positive correlation with anthropometric characteristics. Study recommends that children must be screened regularly for blood pressure so that remedial measure can be initiated as early as possible.

Samhita B.,Womens College | Amitabha S.,Womens College
Research Journal of Chemistry and Environment | Year: 2015

Ruthenium(III) acetate trihydrate reacts with N-salicylidene glycine (slglH2) in methanolic solution in (1: 1.5) molar ratio yielding the complex, [RuII(slglH)Cl(H2O)2] (1) and its reaction with other nitrogen donors pyridine bases results in the complexes of ruthenium(II) of the compositions [RuII(slglH)Cl(H2O)(A)] [A = py (2), 3-pic (3), 4-pic (4)]. The complexes have been characterized by elemental analysis, molar conductance, magnetic moment, cyclic voltammetry, electronic and infrared spectral studies. On the basis of spectral evidences, the ligand, N-salicylidene glycine has been shown to act as monobasic tridentate in these complexes.

Naaz M.,Ranchi University | Dutta A.,Ranchi University | Prasad A.,Womens College
International Journal of Pharma and Bio Sciences | Year: 2014

Tropical tasar silkworm, Antheraea mylitta Drury DABA-ecorace is commercially exploited in India for tasar silk production. Generally, its cocoons get infected with different microbes which causes loss to the silk industry. To curb these diseases antibiotics are being used but with partial success. In the present study, an antimicrobial peptide, Hen egg lysozyme (HEL) has been used and enzyme-based methods have been used to evaluate the impact on A. mylitta pupae. Interestingly, differences in protein concentration and fat body acid phosphatase (Acp) activity of treated pupae have been observed. Significant variation was observed in both profileof control and treated male pupae.The protein content of treated pupa has been found to be more than untreated but Acp activity profile have found decreased in treated pupae. It is expected that, based on protein content and enzyme-based method impact of antimicrobial peptideson A.mylitta pupae can be evaluated/observed and different antimicrobial peptides can be used as alternative to antibiotics resulting in increased silk yield.

Saha A.,Womens College | Bhaumik S.,Womens College
Research Journal of Chemistry and Environment | Year: 2014

Aqueous extract of the waste orange (Citrus sinensis) peel furnishes a polysaccharide material (OP1) which on saponification gives polysaccharide material (OP2) having equivalent weight 237±3. The saponified polysaccharide induces metachromasia in more aggregating thiazine dye 1,9-dimethylmethylene blue (DMMB, 1x10-5M) but fails to do so in potentially less metachromatic dye toluidine blue (TB, 2x10-5M) and methylene blue (MB, 2x10-5M).OP2 also induces strong metachromasy (blue shift ∼110nm) in dye pinacyanol chloride(PCYN, 1x10-5M). Spectrum of aqueous solution of pseudoisocyanine chloride (PIC, 2x10 -5M) has been found to remain unperturbed by OP2. Half plateau values signifying destruction of metachromatic compounds to the extent of 50% correspond to 12% and 21% ethanol for DMMB-OP2 and PCYN-OP2 systems respectively. The stoichiometry determination by isolation technique revels that DMMB and PCYN bind with OP2 in the molar ratio 1:1. Thermodynamic parameters obtained from spectral data indicate chromotropic character of the polysaccharide in interacting with the cationic dye molecule in solution.

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