Srikrishna College

Bagulā, India

Srikrishna College

Bagulā, India
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Dey K.,Indian Institute of Science | Indra A.,Indian Association for The Cultivation of Science | Indra A.,Srikrishna College | Giri S.,Indian Association for The Cultivation of Science
Journal of Alloys and Compounds | Year: 2017

Near the paramagnetic to ferrimagnetic transition temperature, the dc magnetization data of two sulpho spinels, CoCr2S4 and FeCr2S4, are analyzed by the modified Arrott plot, the Kouvel-Fisher method, log M vs log H, and the scaling analysis. Critical exponents β = 0.3946±0.0064, 0.421±0.04, γ = 1.101±0.004, 1.041±0.015, and δ = 3.77±0.06, 3.512±0.14 are obtained around the critical temperature ∼ 224.4 K and 166.5 K for CoCr2S4 and FeCr2S4, respectively. Scaling analysis indicates that calculated critical exponents, as well as critical temperatures, are intrinsic to the systems. The values of critical exponents of CoCr2S4 are between those predicted for a three dimensional Heisenberg model and those predicted by mean field theory. Probably, the observed large spin-phonon coupling and magnetocrystalline anisotropy caused by Co ion may play the key role in this critical behavior of CoCr2S4. The critical exponents of FeCr2S4 are close to the mean field theory except for δ, which is higher than the theoretical value. The higher value of δ may arise due to the incomplete ferrimagnetic transition and presence of short range magnetic ordering above TC for FeCr2S4. © 2017 Elsevier B.V.

Sahu R.,Jadavpur University | Dewanjee S.,Jadavpur University | Dua T.K.,Jadavpur University | Gangopadhyay M.,Bose Institute of India | And 2 more authors.
Natural Product Research | Year: 2012

Diospyros peregrina is an edible seasonal fruit found in coastal West Bengal, India. The fruits have been reported to possess a significant antioxidant activity. In this study, the aim was to isolate the lead compound responsible for the above-mentioned activity. The aqueous extract of D. peregrina fruit was subjected to dereplication coupled with an in vitro 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging assay. The n-butanol fraction of the aqueous extract of D. peregrina fruit exhibited significant antioxidant activity (IC 50, 131.10 μg mL -1) as compared with the parent extract (IC 50, 285.15 μg mL -1). The n-butanol fraction was subjected to silica gel column chromatographic separation coupled with a chemo-autographic study of column eluents, employing ethanolic DPPH as a spraying reagent. Two bioactive flavonoid glycosides, namely luteoline-4′-methyl-ether-7-O-glucoside and quercetin-3-O-(glucosyl)- glucoside, were identified to exhibit IC 50 values of 74.04 and 65.78 μg mL -1, respectively in the DPPH assay. © 2012 Taylor & Francis.

Mukherjee A.K.,Srikrishna College | Kundu A.,Jadavpur University
Journal of Rural Development | Year: 2013

The paper analysed the impact of 'Swarnajayanti Gram Swarojgar Yojana (SGSY)', a governmen t sponsored micro-finance programme, on 'food expenditure', 'expenditure on temptation good', 'expenditure on children's education and health', 'business expenditure'and 'profit'across different castes, creeds and religious beliefs. Murshidabad district of West Bengal, India, was chosen as the field of investigation. During the survey stratification was done in terms of social hierarchy and religious beliefs. These are Upper Caste Hindus (UC); Other Backward Cas tes (OBQ; Scheduled Castes (SC) and Muslims. Taking together they are called socio-religious communities (SRCs). To remove selection bias we used 'treatment effect model'. The paper reveals that participation in SGSY programme decreased 'food expenditure'across all SRCs significantly except Muslims. Borrowing from the SGSY programme has significant negative impact on 'expenditure on temptation good'for the households of UC and OBC communities. The influence is negative but insignificant for Muslim-programme participating households. However, participation in the SGSY programme increased expenditure on temptation good for SCs, though insignificantly. Borrowing from SGSY-run self-help group (SHG) enhanced spending on children's education and health across all SRCs, but significantly for UC and OBC. 'Business expenditure'and 'profit' increased significantly due to programme participation across all SRCs except Muslims. Programme participant Muslim-households get minimal benefits of this development programme among SRCs.

Mukherjee A.K.,Srikrishna College | Kundu A.,Jadavpur University
Gender, Technology and Development | Year: 2012

The article explores the impact of a government-sponsored microcredit program in India on women's decision-making powers across different socioreligious communities (SRCs). The article shows that women's participation in the Swarnajayanti Gram Swarojgar Yojona (SGSY) has resulted in varied patterns of decision-making across SRCs in four areas chosen for inquiry: (a) money management, (b) food items, (c) use of borrowed money, and (d) kinship and family matters. The likelihood of decisions being taken by "female-only" increased among households participating in SGSY, irrespective of caste and creed, compared to those not participating in it (the control group). However, men continue to take decisions in money management in both the participating and nonparticipating households. In the other three spheres, women of participating households have a greater say as compared to those in the control group. © 2012 Asian Institute of Technology.

Dey S.P.,Srikrishna College | Mallik A.K.,Jadavpur University
Journal of the Indian Chemical Society | Year: 2011

On treatment with mercuric acetate 2′-allyloxy-5-chloroacetophenonc oxime and 2′-aryloxy-5-chloroacetophenone afforded organo-mercuro compounds in excellent yield at room temperature.

Mandal T.K.,Jadavpur University | Pal R.,Jadavpur University | Mondal R.,Jadavpur University | Dey S.P.,Srikrishna College | Mallik A.K.,Jadavpur University
Journal of Chemistry | Year: 2013

On treatment with NaN3/c. H2SO4-HOAc or NaN 3/TFA, E-3-benzylidenechromanones are mostly converted to E-β-aminobenzylidenechromanones while E-3-benzylidenethiochromanones are converted to 3-benzoylthiochromones. A structurally new type of product has been isolated for the reaction of E-3-benzylidene-4′-methoxychromanone with NaN3/TFA. Mechanistic paths have been suggested for formation of the products. © 2013 Tapas K. Mandal et al.

Sepay N.,Centenary College | Dey S.P.,Srikrishna College
Journal of Heterocyclic Chemistry | Year: 2014

4-Oxo-4H-1-benzopyran-3-carboxaldehyde (chromone-3-carboxaldehyde or 3-formylchromone) 1 is an important biologically active compound. It can serve as a precursor in the synthesis of a wide range of heterocyclic systems having chromone moiety, many of which exhibit broad spectrum of biological activities such as anti-mutagenisity, cytotoxicity, thymidine phosphorylase inhibitor, and anti-HIV activity. During the last decade, the title compound was studied extensively. The review presents an overall survey of the synthesis, chemical reactivity, and biological activities of 4-oxo-4H-1-benzopyran-3-carboxaldehydes and some of its derivatives. Synthesis, chemical reactions, and biological activities of the title compound and some of its derivatives are reviewed. © 2014 HeteroCorporation.

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