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S. Dasgupta , K. Sankar , A. K. Gupta

Abstract

The study on status and distribution of gaur was carried out in Trishna Wildlife Sanctuary (TWS), Tripura between 2002 and 2004. The density of gaur was found to be 1.5 groups per km² and 5.9 individuals per km². The group size of gaur ranged between 2 and 14 and the observed overall sex ratio (Bulls : Cow) was 58 : 100. Gaur density in TWS remained without any significant change and thus showed that the population is not facing any immediate threat, if not removed directly by poaching, hunting or epidemics. Group size and sex ratio of gaur observed in TWS is comparable with any of the population so far reported from India and thus can be seen as a potential population for the long term conservation.

Keywords

Gaur (Bos Gaurus H. Smith), Density, Group-size, Sex-ratio, Sub-tropical Semi-evergreen
Forest, Trisha Wildlife Sanctuary, Tripura, India

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D. B. Deb , S. Dasgupta

Abstract

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D. B. Deb , S. Dasgupta

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A. Bera ¹, S. Dasgupta ¹, P. Banerjee Sawant ¹, N. K. Chadha ¹, A. K. Pal ¹

Affiliations
1 Central Institute of Fisheries Education (ICAR), Versova, Mumbai, 400061, IN

Abstract

No Abstract

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Th. C. Singh ¹, S. Biswas ², S. Dasgupta ², A. Mitra ³, A. K. Panda ⁴, R. K. Nath ²

Affiliations
1 Department of Chemistry, D. D. M. College, Khowai, Tripura-799 202, IN
2 Department of Chemistry, Tripura University, Suryamaninagar, Tripura-799 130, IN
3 Department of Chemistry, N. S. Mahavidyalaya, Udaipur, Tripura-799 120, IN
4 Department of Chemistry, University of North Bengal, P.O. North Bengal University, District:Darjeeling, West Bengal-734 013, IN

Abstract

Spectral studies on the interaction of capsular polysaccharide (SPS) isolated from Klebsiella serotype K34, with oppositely charged dyes and surfactants have been reported. The SPS was acidic in nature and induced strong metachromacy (∼110 nm blue shift) in the cationic dye pinacyanol chloride (PCYN) which was due to "card-pack stacking" of individual dye monomers on the surface of the polyanions. Reversal of metachromacy offered a qualitative measurement of stability and nature of binding associated with PCYN-SPS complex. Thermodynamic parameters of dye-polymer complex were evaluated. SPS-cationic dye acridine orange (AO) interaction in aqueous solution have been investigated fluorimetrically. Dye incorporation technique was employed to study cationic surfactant-polymer interactions. Interactions between the polyelectrolyte and oppositely charged surfactants lead to the formation of induced premicelles at surfactant concentrations lower than the CMC of the surfactants and the corresponding binding constant was evaluated. Such studies revealed that the surfactant is not exclusively bound electrostatically, but also through hydrophobic interactions.

Keywords

Dye, Surfactant, SPS, Klebsiella, Binding Constant.

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D. K. Bhattacharya ¹, S. Dasgupta ²

Affiliations
1 Department of Geology, Ranchi University, Ranchi - 834 008, IN
2 Department of Mines and Geology, Ranchi - 834 002, IN

Abstract

Apatite mineralisation occurs in the host rock chlorite phyllite which grades into chlorite schist and is granitised. Discontinuous veins of apatite within apatite-magnetite rock exhibit many morphological types. The apatites also contain tantalum, niobium, titanium, molybdenum and vanadium. Studies reveal that apatite mineralisation is controlled by both structure and lithology.

Keywords

Apatite Mineralisation, Purulia Dist, West Bengal.

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K. C. Prashra ¹, S. Dasgupta ²

Affiliations
1 306 F, Sector 7A, Chandigarh - 160019, IN
2 129. D. J. Road, Bhadrakali, Hooghly (W.B.) - 712232, IN

Abstract

The Miyar glacier is a 28 km. long valley-type galcier with a number of transverse tributary glaciers, encompassing an area of about 110 sq. km of ice and snow in its basin. It has retreated by about 325 m between 1963 and 1983 with an average annual retreat of about 16 m. This phenomenon is comparable with similar recessionery trends of other galciers of Lahaul, which indicates deglaciation period still prevalent in this part of the Himalaya.

Keywords

Glaciology, Geomorphology, Lahaul- Spiti, Himachal Pradesh.

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S. S. Thakur ¹, S. C . Patel ¹, S. Dasgupta ¹

Affiliations
1 Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai- 400 076, IN

Abstract

The Precambrian Sukma supracrustal sequence near Nagaras, southern Bastar Craton, has been mapped as two quartzite lithounits and an intervening undifferentiated unit comprising Mg-Al rich granulite, mafic granulite, amphibolite and hornblende schist. The rocks bear imprints of three phases of deformation. The structures of the first generation are represented by rarely occurring small isoclinal folds(F₁) on bedding (S₀), and pervasive axial planar foliation (S₁). The folds of second generation (F₂) vary from open to close, and upright to locally overturned with NNWSSE to NNE-SSW striking axial planes Gentle warps with ESE-WNW striking axial planes represent folds of the third generation (F₃) Superposition of F₃ folds on F₂ folds has resulted in Dome-and-Basin interference pattern in both small and large scales. The map pattern is elongated in the N-S direction because of control by F₂ folds, and slight concave geometry towards west is the result of F₃ folding.

Keywords

Structural Geology, Sukma Supracrustals, Granulite, Bastar, Chhattisgarh.

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S. Dasgupta ¹, I. C. Das ¹, S. K. Subramanian ¹, V. K. Dadhwal ¹

Affiliations
1 National Remote Sensing Centre, ISRO, Hyderabad 500 625, IN

Abstract

Monthly, seasonal and annual hydrologic signals obtained by Gravity Recovery and Climate Experiment (GRACE mission) satellites are analysed and compared with storage variables of soil moisture signatures of Monsoon Asia Integrated Regional Study (MAIRS) mission and groundwater level information of Central Ground Water Board, to observe depletion trends of groundwater in the Gangetic plain, at regional scale. While the seasonal time-series showed seasonality in the groundwater storage change, the annual trends depict a decline in this region. Further, the results showed that groundwater storage had declined at a rate 3.33 mm/month from 2005 to 2010. These time-series comparisons of storage variables have agreeable R² (coefficient of determination) and r (correlation coefficient) at various temporal cycles.

Keywords

Groundwater Storage Change, Satellite Missions, Soil Moisture, Storage Variables.

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D. Sreenu ¹, A. K. Saxena ², S. Dasgupta ³

Affiliations
1 Indian Institute of Technology, Roorkee, IN
2 Indian Institute of Technology, Roorkee, Uttarakhand, IN
3 Indian Institute of Technology, Roorkee, Uttarakhand, IN

Abstract

Register file is one of the most power hungry components in the processor consuming about 20% of the processor power, because it contains large capacitances on bit lines, word lines,address lines, and storage cell array and is frequently accessed. This paper presents a complete study of register file based on adiabatic logic at 90nm CMOS process. A 32 x 32 register file using adiabatic complementary pass-transistor logic (ACPL) has been designed. All the circuits expect for storage cell employ ACPL circuits and storage cell is based on conventional memory (SRAM cell). Since register file consists of large capacitances, the minimization of power consumption is made by choosing optimal size of ACPL circuits for driving large capacitances. For comparison, two other register file based on same organization were simulated using CPAL and conventional CMOS logics. Simulation results shows that adiabatic CPL register file achieves power saving of 30% with CPAL and 91% to 95% with conventional CMOS logic for clock frequencies ranging from 50 to 500MHz. Since power consumption is a function of output load capacitance and supply voltage, we have also simulated these register file for various supply voltages and load capacitances.

Keywords

Adiabatic Logic, ACPL, Low Power, Register File, SRAM.

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H. K. Tarafder ¹, A. Dey ², S. Dasgupta ³

Affiliations
1 Regional Research Station (U.B.K.V.) (Hill Zone), Kalimpong, Darjeeling (W.B.), IN
2 Regional Research Station (B.C.K.V.), New Alluvial Zone, Gayeshpur, Nadia (W.B.), IN
3 Directorate of Reserach, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, Nadia (W.B.), IN

Abstract

Mung bean is an important pulse crop in West Bengal, growing nearly 11.7 thousands hectares of land. Scientific literature and case studies of inoculating of microbes by various scientists found significant response to crop growth. The present study was made to reduce fertilizer application rate by coinnoculating phosphate solubilizing bacteria and rhizobia for mung bean. The experiment was conducted in the year 2011 and 2012 at the 'Instructional Farm' Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal. FactorialRandomized Block Design was laid out with three replications and 10 treatment combinations. The treatments was without inoculation (A₀) and seed inoculation with Rhizobium and phosphate solubilizing bacteria (PSB) strain (A₁) as factor one and fertilizer treatments like untreated control (no fertilizer application B₀), application of NPK (recommended dose as basal B₁), 75 per cent recommended dose of N and P₂O₅ + 100% K₂O (B₂) and 50 per cent recommended dose of N and P₂O₅ + 100% K₂O (B₃). It was observed that inoculation with Rhizobium and phosphate solubilizing bacteria (PSB) along with 75 per cent RDF i.e. treatment combination (A₁B₂) was at par with treatment A₁B₁ i.e. 100 per cent RDF with respect to all the growth parameters and yield attributing characters of mung bean. So, it can be concluded that both 25 per cent nitrogenous and phosphatic fertilizer of the recommended dose can be substituted by seed co-inoculation with phosphate solubilizing bacteria and rhizobia without affecting the yield compared to 100 per cent RDF.

Keywords

Bacillus polymyxa, Rhizobia, Mung Bean, Seed Inoculation.

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B. K. Parida ¹, R. V. Vyas ², Y. K. Jhala ², S. Dasgupta ¹

Affiliations
1 Bhagwan Mahavir College of M Sc Biotechnology, Surat - 395 017, IN
2 Department of Agricultural Microbiology, Anand Agricultural University, Anand - 388 110, IN

Abstract

This study was carried out to evaluate the efficacy of agriculturally beneficial fungi for potash solubilization and to develop myco-potash cultures for use in crop growth. In all six fungal cultures were utilized in the study, viz. Paecilomyces lilacinus, Tricoderma harzianum, Aspergillus wentii, Emericella nidulans, Verticillium lecanii and Tricoderma viride. Among them, A. wentii and T. viride were found to produce 3.3 and 3.65 mm solubilization index around the colony after 7 days of incubation (DAI) on Aleksandrov medium supplemented with mica as potash source. Whereas for agar medium supplemented with feldspar, maximum solubilization index was 2.5 mm (A. wentii), 2.55 mm (T. viride), 2.48 mm (V. lecanii) and 2.58 mm (P. lilacinus) 7 DAI. To reveal the mechanism of potash solubilization, A. wentii, T. viride, T. harzianum and V. lecanii were chosen for organic acid profiling using HPCL. A. wentii produced the highest amount of total organic acid (1847.775 μg/ml).

Keywords

Fungal Cultures, Myco-Potash, Organic Acids, Solubilization Index.

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