Reinforcing Nafion® with Poly(ethylene-alt-maleic anhydride) as Water-Absorbing and Film-Forming Polymer

Talukdar, Krishan,Kim, Hee Jin,Kabir, Md. Lutful,Choi, Sang-June AMERICAN SCIENTIFIC PUBLISHERS 2017 Journal of nanoelectronics and optoelectronics Vol.12 No.8

Exogenous Calcium Alleviates the Impact of Cadmium-Induced Oxidative Stress in Lens culinaris Medic. Seedlings Through Modulation of Antioxidant Enzyme Activities

Talukdar, Dibyendu 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.4

The effect of calcium (Ca) on lentil (Lens culinaris Medic.) seedlings exposed to cadmium (Cd) stress was studied by investigating plant growth and antioxidant enzyme activities. Plants were grown for 14 days in full-strength Hoagland nutrient media supplemented with Cd concentrations of 0, 10, 20, and 40 ${\mu}M$, and on corresponding medium supplied with 5 mM $Ca(NO_3)_2$ prior to Cd addition. Increasing Cd led to accumulation of metal and reduced the fresh weight of the shoots more strongly than that of the roots. Cd concentrations of 20 and 40 ${\mu}M$ were selected to study its toxic effect on seedlings. Activities of superoxide dismutase, ascorbate peroxidase, catalase, dehydroascorbate reductase, and glutathione reductase decreased at much higher magnitude in the shoots than those observed in the roots under Cd exposure. Failure of antioxidant defense in scavenging of reactive oxygen species was evidenced by abnormal rise in $H_2O_2$, resulting in enhancement of lipid peroxidation and membrane electrolyte leakage as the marks of Cd-induced oxidative stress in lentil seedlings. Ca priming in the media significantly reduced the Cd accumulation and considerably alleviated the adverse impact of Cd treatment by modulating the antioxidant enzyme activity. Mitigation of Cd-induced stress by Ca application was strongly suggested by declining levels of $H_2O_2$ and consequent lowering of oxidative damage of membrane. Consequently, this enhanced fresh mass of plant parts as the sign of Ca-mediated normal growth in Cd-treated lentil seedlings.

Exogenous Calcium Alleviates the Impact of Cadmium- Induced Oxidative Stress in Lens culinaris Medic. Seedlings Through Modulation of Antioxidant Enzyme Activities

Dibyendu Talukdar 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.4

The effect of calcium (Ca) on lentil (Lens culinaris Medic.) seedlings exposed to cadmium (Cd) stress was studied by investigating plant growth and antioxidant enzyme activities. Plants were grown for 14 days in full-strength Hoagland nutrient media supplemented with Cd concentrations of 0, 10, 20, and 40 μM, and on corresponding medium supplied with 5 mM Ca(NO3)2 prior to Cd addition. Increasing Cd led to accumulation of metal and reduced the fresh weight of the shoots more strongly than that of the roots. Cd concentrations of 20 and 40 μM were selected to study its toxic effect on seedlings. Activities of superoxide dismutase, ascorbate peroxidase, catalase, dehydroascorbate reductase, and glutathione reductase decreased at much higher magnitude in the shoots than those observed in the roots under Cd exposure. Failure of antioxidant defense in scavenging of reactive oxygen species was evidenced by abnormal rise in H2O2, resulting in enhancement of lipid peroxidation and membrane electrolyte leakage as the marks of Cd-induced oxidative stress in lentil seedlings. Ca priming in the media significantly reduced the Cd accumulation and considerably alleviated the adverse impact of Cd treatment by modulating the antioxidant enzyme activity. Mitigation of Cd-induced stress by Ca application was strongly suggested by declining levels of H2O2 and consequent lowering of oxidative damage of membrane. Consequently, this enhanced fresh mass of plant parts as the sign of Ca-mediated normal growth in Cd-treated lentil seedlings.

Culture,Literature : Tar Baby : Search for Identity in Commodity Culture

( Susmita Talukdar ) 경희대학교 비교문화연구소 2013 比較文化硏究 Vol.32 No.-

Tar Baby, Toni Morrison`s fourth novel re examines the problem that black characters face in negotiatiating a place for themselves within a dominant culture, with respect their own history and culture. The novel critiques the dominant socio economic and commodifying cultural space from which the black woman seems to have no escape. Jadine is a colonized subject, for as a fashion model she has surrendered to an aesthetics of commodification, and as a student of art history, she has internalized the capitalist ethic of the white culture industry. Though she has ensured her freedom, Morrison`s critique of her separation from her family and culture is unmistakable. Interwoven with her narrative is Son`s predicament, the stereotype of a black racist and her ‘love’. The novel ends with him at the crossroads of culture, yet signaling his passage to freedom through resistance. The paper arguments how Toni Morrison has envisioned the welfare of African American community by reconstructing the role of new black generation, as represented by Jadine and Son, whose new journey towards their self fulfillment just not bring their personal freedom but also regenerates African American community by resisting dominant commodifying cultural.

Identification of flexible vehicle parameters on bridge using particle filter method

S. Talukdar,R. Lalthlamuana 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.57 No.1

A conditional probability based approach known as Particle Filter Method (PFM) is a powerful tool for system parameter identification. In this paper, PFM has been applied to identify the vehicle parameters based on response statistics of the bridge. The flexibility of vehicle model has been considered in the formulation of bridge-vehicle interaction dynamics. The random unevenness of bridge has been idealized as non homogeneous random process in space. The simulated response has been contaminated with artificial noise to reflect the field condition. The performance of the identification system has been examined for various measurement location, vehicle velocity, bridge surface roughness factor, noise level and assumption of prior probability density. Identified vehicle parameters are found reasonably accurate and reconstructed interactive force time history with identified parameters closely matches with the simulated results. The study also reveals that crude assumption of prior probability density function does not end up with an incorrect estimate of parameters except requiring longer time for the iterative process to converge.

Conservation status of some endangered mammals in Barak Valley, Northeast India

Nazimur Rahman Talukdar,Biswajit Singh,Parthankar Choudhury 국립중앙과학관 2018 Journal of Asia-Pacific Biodiversity Vol.11 No.2

From the ancient time, the Northeast part of India is rich in biodiversity because of its diverse topographic, climatic features. Different varieties of mammalian, avian, and herpetofauna are endemic to this region. Unfortunately, life of this diverse flora and fauna is in jeopardy due to serious anthropogenic pressure. Once a large number of globally important species sustained in the Barak Valley. However, with the increasing population and subsequent demand on natural resources and developing activities, many of the species are no more found in the valley. If the conservation action is not initiated, the remaining species will also vanish with time. This article highlights the distribution and conservation problems of four endangered species in the Barak Valley of Assam, India and recommended conservation tactics.

Multiple Complement Pathway-related Proteins Might Regulate Immunopathogenesis of Major Depressive Disorder

Preethi V. Reddy(Preethi V. Reddy ),Pinku Mani Talukdar(Pinku Mani Talukdar ),Manjula Subbanna(Manjula Subbanna ),Praerna H. Bhargav(Praerna H. Bhargav ),Rashmi Arasappa(Rashmi Arasappa ),Ganesan Venk 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.2

Objective: Exacerbated inflammatory pathway has emerged as a predominant etiological construct of major depressive disorder (MDD). Innate immune molecules like complement proteins induce inflammatory responses and also regulate key neurobiological processes. However, there is a dearth of literature on the impact of critical complement proteins in MDD. Herein, plasma profiling of seven complement proteins was carried out to obtain a better insight into the role of the complement pathway in MDD. Methods: Plasma levels of C1q, C3, C3b/iC3b, C4, Factor B, Factor H, and properdin were assayed in 22 patients with MDD and 27 healthy controls by multiplex suspension assay. The patients with MDD were diagnosed as per DSM IV-TR. Hamilton Depression Rating Scale (HAM-D), Montgomery Depression Rating Scale and Clinical Global Improvement were used for clinical assessments of the patients. The plasma levels of these complement proteins were also correlated with various clinical scores and phenotypes of MDD. Results: The patients with MDD and healthy controls did not differ in terms of age and gender (p > 0.1). The patients with MDD had a mean duration of illness of around 3 years, with average number of depressive episodes being 6 and the mean HAM-D score was 19. Of the seven complement components, the plasma levels of C1q, Factor B, and Factor H (p ≤ 0.05) were significantly elevated in MDD patients compared to healthy controls. However, the plasma levels of these complement proteins were not found to correlate with the clinical profile of MDD patients. Conclusion: Both Factor B and Factor H are crucial in the induction and regulation of the alternative pathway of complement activation. The alternative pathway also plays a critical role in inflammation. These findings suggest an important role of the alternative complement pathway in immuno-inflammation in MDD.

Fatigue life prediction of horizontally curved thin walled box girder steel bridges

Nallasivam, K.,Talukdar, Sudip,Dutta, Anjan Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.28 No.4

The fatigue damage accumulation rates of horizontally curved thin walled box-girder bridge have been estimated from vehicle-induced dynamic stress history using rain flow cycle counting method in the time domain approach. The curved box-girder bridge has been numerically modeled using computationally efficient thin walled box-beam finite elements, which take into account the important structural actions like torsional warping, distortion and distortional warping in addition to the conventional displacement and rotational degrees of freedom. Vehicle model includes heave-pitch-roll degrees of freedom with longitudinal and transverse input to the wheels. The bridge deck unevenness, which is taken as inputs to the vehicle wheels, has been assumed to be a realization of homogeneous random process specified by a power spectral density (PSD) function. The linear damage accumulation theory has been applied to calculate fatigue life. The fatigue life estimated by cycle counting method in time domain has been compared with those found by estimating the PSD of response in frequency domain. The frequency domain method uses an analytical expression involving spectral moment characteristics of stress process. The effects of some of the important parameters on fatigue life of the curved box bridge have been studied.

Effect of vehicle flexibility on the vibratory response of bridge

Lalthlamuana, R.,Talukdar, Sudip Techno-Press 2014 Coupled systems mechanics Vol.3 No.2

In the recent times, dimensions of heavy load carrying vehicle have changed significantly incorporating structural flexibility in vehicle body. The present paper outlines a procedure for the estimation of bridge response statistics considering structural bending modes of the vehicle. Bridge deck roughness has been considered to be non homogeneous random process in space. Influence of pre cambering of bridge surface and settlement of approach slab on the dynamic behavior of the bridge has been studied. A parametric study considering vehicle axle spacing, mass, speed, vehicle flexibility, deck unevenness and eccentricity of vehicle path have been conducted. Dynamic amplification factor (DAF) of the bridge response has been obtained for several of combination of bridge-vehicle parameters. The present study reveals that flexible modes of vehicle can reduce dynamic response of the bridge to the extent of 30-37% of that caused by rigid vehicle model. However, sudden change in the bridge surface profile leads to significant amount of increment in the bridge dynamic response even if flexible bending modes remain active. The eccentricity of vehicle path and flexural/torsional rigidity ratios plays a significant role in dynamic amplification of bridge response.

Rating of steel bridges considering fatigue and corrosion

Lalthlamuana, R.,Talukdar, S. Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.5

In the present work, the capacity ratings of steel truss bridges have been carried out incorporating dynamic effect of moving vehicles and its accumulating effect as fatigue. Further, corrosion in the steel members has been taken into account to examine the rating factor. Dynamic effect has been considered in the rating procedure making use of impact factors obtained from simulation studies as well as from codal guidelines. A steel truss bridge has been considered to illustrate the approach. Two levels of capacity ratings- the upper load level capacity rating (called operating rating) and the lower load level capacity rating (called inventory rating) were found out using Load and Resistance Factor Design (LRFD) method and a proposal has been made which incorporates fatigue in the rating formula. Random nature of corrosion on the steel member has been taken into account in the rating by considering reduced member strength. Partial safety factor for each truss member has been obtained from the fatigue reliability index considering random variables on the fatigue parameters, traffic growth rate and accumulated number of stress cycle using appropriate probability density function. The bridge has been modeled using Finite Element software. Regressions of rating factor versus vehicle gross weight have been obtained. Results show that rating factor decreases when the impact factor other than those in the codal provisions are considered. The consideration of fatigue and member corrosion gives a lower value of rating factor compared to those when both the effects are ignored. In addition to this, the study reveals that rating factor decreases when the vehicle gross weight is increased.