Copper nanoparticle induced macromutation in Macrotyloma uniflorum (Lam.) Verdc. (Leguminosae): a pioneer report     

Sandip Halder  Aninda Mandal  Debadrito Das  Sudha Gupta  Asoke Prasun Chattopadhyay  Animesh Kumar Datta 《Genetic Resources and Crop Evolution》2015,62(2):165-175

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A host-targeting signal in virulence proteins reveals a secretome in malarial infection     

Hiller NL  Bhattacharjee S  van Ooij C  Liolios K  Harrison T  Lopez-Estraño C  Haldar K 《Science (New York, N.Y.)》2004,306(5703):1934-1937

Malaria parasites secrete proteins across the vacuolar membrane into the erythrocyte, inducing modifications linked to disease and parasite survival. We identified an 11-amino acid signal required for the secretion of proteins from the Plasmodium falciparum vacuole to the human erythrocyte. Bioinformatics predicted a secretome of >320 proteins and conservation of the signal across parasite species. Functional studies indicated the predictive value of the signal and its role in targeting virulence proteins to the erythrocyte and implicated its recognition by a receptor/transporter. Erythrocyte modification by the parasite may involve plasmodial heat shock proteins and be vastly more complex than hitherto realized.  相似文献   

<Emphasis Type="Italic">Echinococcus granulosus</Emphasis> of Buffalo in India: Partial Characterization of Excretory-Secretory and Germinal Membrane Antigens     

Maity A  Bhattacharya D  Batabyal S  Chattopadhyay S  Bera AK  Karmakar PK 《Veterinary research communications》2007,31(4):457-460

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Low-temperature dyeing of silk fabric using atmospheric pressure helium/nitrogen plasma     

M. D. Teli  Kartick K. Samanta  Pintu Pandit  S. Basak  S. K. Chattopadhyay 《Fibers and Polymers》2015,16(11):2375-2383

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Studies on structural integrity of polyester-cotton friction spun yarn by cycling extension test     

R. Chattopadhyay  S. K. Sinha 《Fibers and Polymers》2011,12(2):268-274

Yarns and fabrics are subjected to a low level of stresses or strains of repetitive nature in processing and actual use which leads to breakage, permanent deformation, bagging and loss of useful life of the product. The ability of the spun yarns and fabrics to withstand such stresses depends upon their structural integrity. A structurally rigid yarn (i.e. yarns in which fibres are tightly bound) would behave more like an elastic solid and consume more energy during deformation as the constituent fibres have to be deformed. Once the strain is released, the recovered energy will also be more. On the other hand if the structural integrity of the same yarn is poor, fibres would easily slip during deformation and would consume much less energy. The recoverable energy also will be much less. The present investigation reports on the structural integrity of friction spun yarns in terms of energy loss or decay by employing cyclic extension test. It has been observed that friction spun yarns in which the core is immediately wrapped by long and strong polyester fibre layer make the structure strongest as polyester is expected to form tight wrappings. The decay in deformation energies during extension cycling depends upon sheath structure i.e. its composition and location of constituent fibres in sheath layers. With increase in core fibre %, the decay has been found to increase. However, the decay values discriminate more between core% differences than between sheath fibre layer arrangements.  相似文献   

Tubifex production using agro-industrial wastes and raw cattle dung     

R. N. Mandal  S. Kar  D. N. Chattopadhyay  J. Maity  B. N. Paul  P. P. Chakrabarti 《Journal Of Applied Aquaculture》2013,25(2):70-75

ABSTRACT

Tubifex (Tubifex tubifex) was cultured in captivity using three different wastes: rice mill sludge (RMS), dairy sludge (DS), and raw cattle dung (RCD). Three experiments were conducted: 10, 20, and 30 days. A total of 100 g of tubifex at 62.5 g m^?2 was inoculated in 1.6 m² fiberglass-reinforced plastic tanks. Comparing all production parameters, RMS > DS > RCD. Growth rate (g m^?2 d^?1) did not differ among durations. RMS- and DS-fed tubifex contained higher protein and fat than RCD-fed tubifex. Efficiency on production of g tubifex per kg of waste material was highest at 10 days, declining with time for all waste materials. This experiment suggests that RMS and DS are effective wastes for tubifex culture, with total production increasing with no reduction in growth rate through 30 days, but with efficiency declining after 10 days.  相似文献   

A neural network model for prediction of strength loss in threads during high speed industrial sewing     

Vinay Kumar Midha  V. K. Kothari  R. Chattopadhyay  A. Mukhopadhyay 《Fibers and Polymers》2010,11(4):661-668

In this paper artificial neural network (ANN) model has been designed to predict the strength loss in threads during high speed industrial sewing. Four different types of threads (Mercerized cotton, polyester staple spun, polyester-cotton core spun and polyester-polyester core spun) were taken for the study. The other input parameters include thread linear density, fabric area density, number of fabric layers, stitch density and needle size. In order to reduce the dependency of the results on a specific partition of the data into training and testing sets, a four-way cross validation tests were performed, i.e. total data was divided into training and testing set in four different ways. The predicted tenacity loss was correlated to the experimental tenacity loss and correlation coefficient between the actual and predicted tenacity loss obtained. It was observed that the neural network system is able to predict the tenacity loss of threads after sewing with good correlation and less average error. The relative contribution of each parameter to the overall prediction of the tenacity loss was studied by carrying out the sensitivity analysis of the test data set. The results of sensitivity analysis show that thread type is the most important input parameter followed by thread linear density, number of fabric layers, fabric area density, needle size and the stitch density.  相似文献   

Simulating coconut growth, development and yield with the InfoCrop-coconut model   总被引：1，自引：0，他引：1  

Kumar SN  Bai KV  Rajagopal V  Aggarwal PK 《Tree physiology》2008,28(7):1049-1058

Simulation modeling of perennial crops has immense potential for generating information for plantation managers. We report the development of the InfoCrop-coconut model and its application to coconut (Cocos nucifera L.) growing in diverse tropical and subtropical environments. The model is based on the generic crop model InfoCrop that simulates various annual crops in tropical and subtropical regions. The InfoCrop-coconut model was calibrated and validated with data compiled from published studies comprising many physiological, agronomical and nutritional experiments conducted between 1978 and 2005 in diverse geographic locations throughout India. The treatments included various water and nutrient regimes and varieties of coconut. Time to first flowering varied between 4 and 6 years, leaf production varied from 8 to 15 leaves year(-1) and nut yield ranged from 3000 to 27,000 nuts ha(-1) year(-1). The genetic coefficients used for calibration and validation were generated from field experiments conducted during 1995-2005. Model efficiency and validation performance were analyzed statistically. Simulated trends in phenological development, total dry mass and its partitioning, and nut yield agreed closely with observed values, although a 15% error was observed in a few cases. Considering that field measurements have an experimental error of 10-15% and wide variation existed within treatments, the model adequately simulated the effects of management practices and agro-climatic conditions over short periods. For a range of agro-climatic zones, simulated potential yields varied from 26 to 30 Mg ha(-1) year(-1) and potential annual dry mass production varied from 52 to 62 Mg ha(-1), depending on environment. We conclude that InfoCrop-coconut can be used to increase the efficiency of agronomic experiments designed to aid coconut crop management.  相似文献   

Identification and Pathogenicity of Pseudomonas aeruginosa DJ1990 on Tail and Fin Rot Disease in Spotted Snakehead          下载免费PDF全文

Dibya J. Saikia  Pritam Chattopadhyay  Goutam Banerjee  Bandita Talukdar  Dandadhar Sarma 《Journal of the World Aquaculture Society》2018,49(4):703-714

Tail and fin rot disease (TFRD) is a big issue in the production of spotted snakehead, Channa punctata Bloch. The aims of the present study were to isolate and identify the bacterial pathogen causing TFRD, to detect histopathological changes in tissues (fin, tail, liver, and kidney), and to ascertain the antibiotic sensitivity pattern of the isolate. Out of six bacterial isolates, only the isolate DJ1990 was found to be the causal candidate of TFRD in C. punctata. Identical histopathological changes were detected in tail, fin, liver, and kidney under light and scanning electron microscope in both collected diseased fish and artificially infected fish. The isolate was identified as Pseudomonas aeruginosa strain DJ1990 (National Center for Biotechnology Information Ace. No. KX709967) based on the biochemical characterization tests and 16S rDNA sequence‐based phylogeny analysis. Artificial challenge test demonstrated that the strain DJ1990 was highly virulent (100% mortality at 48 h of postinjection period at the concentration of 1.5 × 10⁷ CFU/g of body weight) for C. punctata. The isolate exhibited sensitivity to the broad‐spectrum antibiotics but was resistant against aztreonum. To the best of our knowledge, this is the first report of P. aeruginosa as a TFRD‐causing candidate in C. punctata.  相似文献   

PQM-1: A newly developed superior clone of pineapple for northeastern India as evident through phenotype,fruit quality and DNA polymorphism     

Jai Prakash  S. Bhattacharyya  Krishnendu Chattopadhyay  S. Roy  S.P. Das  N.P. Singh 《Scientia Horticulturae》2009

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