Performance Evaluation of Modified Black Clay as a Heterogeneous Fenton Catalyst on Decolorization of Azure B Dye: Kinetic Study and Cost Evaluation     

Kumar  Vijyendra  Ghosh  Prabir 《天津大学学报(英文版)》2019,25(5):527-539

Black clay(BC) was used as a catalyst for the decolorization of Azure B dye by Fenton process. BC was modified by acid, alkali, distilled water, and calcination to check their changes in characterization and efficiency on decolorization of Azure B. Among three modified catalysts, maximum decolorization was obtained by acid-modified BC(AMBC) catalyst due to the highest removal of impurities, comparatively. The characterization of AMBC was done by Fourier-transform infrared spectroscopy and X-ray diffraction spectroscopy which show the presence of metal ion. The BET surface area, pore volume, pore size, and density of AMBC were calculated to be 79.402 m~2/g, 0.0608 m~3/g, 0.00306 nm, and 16 g/cm~3, respectively. The highest decolorization of 97.59% was achieved only in 10 min using AMBC at optimized calcination of 100 °C and 3 h of aging. AMBC was considered as the main catalyst for optimizing the different process parameters. Optimized conditions were obtained: pH 2, 0.2 mL of H_2O_2, catalyst dose 0.3 g, room temperature(30 °C), and stirring speed 400 r/min. The catalyst has showed excellent stability and reusability. It could remove more than 85% of color even after four cycles of run and less than negligible leaching of iron. AMBC has good recycling ability among other modified catalysts. To check the selectivity of catalyst, different dyes such as Congo red and mixed dye(mixture of Azure B and Congo red) decolorization were studied. In the present work, kinetic study was also carried out and a three-stage decolorization process was found.  相似文献   

Project lifescape -11 hunter plants     

Dipanjan Ghosh 《Resonance》2003,8(3):64-70

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A Synergistic Role of Myeloperoxidase and High Sensitivity Troponin T in the Early Diagnosis of Acute Coronary Syndrome     

Mihir D. Mehta  Simbita A. Marwah  S. Ghosh  Hitesh Shah  Amit Trivedi  N. Haridas 《Indian journal of clinical biochemistry : IJCB》2016,31(1):75-80

Aim of this study was to evaluate the role of Myeloperoxidase (MPO) and high sensitive Troponin T in the early diagnosis of acute coronary syndrome (ACS). This was a cross sectional study that comprised of 120 individuals of which 75 were cases and 45 healthy controls. On the basis of clinical history and 12 lead electrocardiogram initial diagnosis of ACS was made in the cases. MPO and high sensitive Troponin T (hs-cTnT) was measured in all the individuals. Levels of MPO were significantly higher in patients of ACS as compared to those in control group [medians: 15.40 (95 % CI 11.06–20.84) vs 5.84 (95 % CI 5.50–6.44)]. By taking the cut off as >11.87 U/mL for MPO, its sensitivity was 87 % (95 % CI 73.7–95.1), specificity was 97.3 % (95 % CI 90.6–99.7), positive predictive value was 94.6 % and negative predictive value was 92.6 %. Positive likelihood ratio was 33.0 while negative likelihood ratio was 0.13, whereas the corresponding values in case of hs-cTnT were 95.6 % (95 % CI 85.2–99.5), 61.3 % (95 % CI 49.5–72.6), 59.7 %, 95.8 %, 2.47 and 0.07 by taking cut off as >14 pg/ml. The area under the ROC curves (AUC) of MPO and hscTnT at 0–6 h were 0.971 (95 % CI 0.92–0.99, P < 0.001) and 0.797 (95 % CI 0.71–0.86, P < 0.001) respectively. The logistic model combining the two markers yielded sensitivity, specificity, positive predictive value and negative predictive value of 95.7, 97.3, 98.2 and 93.7 % respectively. It was concluded that MPO and hs-cTnT may be useful tools for risk stratification of ACS and can be used together with better accuracy in the early diagnosis of ACS.  相似文献   

Effect of simultaneous sodium oxalate and methionine feeding with and without Varuna (Crataeva nurvala hook & Frost) therapy on urolithogenesis in guinea pigs     

P. P. Singh  F. Hussain  Reeta Ghosh  A. Ahmed  R. C. Gupta 《Indian journal of clinical biochemistry : IJCB》1992,7(1):23-26

The effect of sodium oxalate and methionine supplementation on stone-related constituents of urine was studied in 18 adult male guinea pigs. Their serum and tissue chemistry and histological changes in urinary tract and liver were also studied. The calciuretic effect of methionine was blocked by oxalate. The decrease in uric acid and citric acid, caused by oxalate, was offset by methionine. Oxalate-induced crystalluria and calcium and oxalate deposition in kidney tissue were lessened by methionine. Administration of Varuna, an indigenuous drug, to oxalate and methionine-supplemented animals prevented either totally or partially most of the urolithogenic effects of oxalate and methionine.  相似文献   

Polymorphisms of CYP1A1, GSTM1 and GSTT1 Loci as the Genetic Predispositions of Oral Cancers and Other Oral Pathologies: Tobacco and Alcohol as Risk Modifiers     

Chatterjee S  Dhar S  Sengupta B  Ghosh A  De M  Roy S  Chakrabarti S 《Indian journal of clinical biochemistry : IJCB》2010,25(3):260-272

Polycyclic aromatic hydrocarbons of tobacco require activation by phase I enzymes, such as cytochrome-P4501A1 (CYP1A1) to become an ultimate carcinogen, which are subjected to detoxification by phase II enzymes, especially glutathione S-transferases (GSTs). A study was designed to find whether genetic predisposition are risk modifiers of oral pathologies. The study included 102 cases with Oral Cancers (OCs), 68 cases with nonmalignant pathologies, 100 cases as control group. GSTM1 null genotype was associated with increased risk of OCs but not with benign pathologies. Deleted GSTT1 was associated with all pathologies. Both m1m2 and m2m2 polymorphisms of CYP1A1 were associated with oral pathologies.  相似文献   

Diagnostic Role of Tumour Markers CEA, CA15-3, CA19-9 and CA125 in Lung Cancer     

Indranath Ghosh  Debojyoti Bhattacharjee  Anjan Kumar Das  Goutam Chakrabarti  Anindya Dasgupta  Subir Kumar Dey 《Indian journal of clinical biochemistry : IJCB》2013,28(1):24-29

The aim of this study was to assess the diagnostic yield of the tumour markers carcinoembryonic antigen, carbohydrate antigen 15-3, carbohydrate antigen 19-9 and carbohydrate antigen 125, in serum and bronchoalveolar lavage fluid in a group of patients with bronchogenic carcinoma. Serum and bronchoalveolar lavage fluid samples were collected in a group of 90 patients with benign or malignant pulmonary diseases. After appropriate processing, tumour markers were determined by enzyme immunoassay. The diagnostic yields (sensitivity, specificity and predictive values) in each environment (serum and bronchoalveolar lavage fluid) were obtained by using "Receivers operating characteristic" curve. Determined individually, carcinoembryonic antigen, carbohydrate antigen 19-9 and carbohydrate antigen 125, showed the greatest diagnostic accuracy in bronchoalveolar lavage fluid. Carbohydrate antigen 15-3 did so in serum. Carcinoembryonic antigen was the most relevant marker in bronchoalveolar lavage fluid. For the factors evaluated in this study, determination of carcinoembryonic antigen, carbohydrate antigen 19-9 and carbohydrate antigen 125 in bronchoalveolar lavage fluid were clinically more useful markers in comparison with serum, although the latter may also be helpful in certain situations. Although there is no specific tumour marker for lung cancer, the combination of several can be used to diagnose most patients with lung cancer and also to rule out false positive and negative cases.  相似文献   

Evaluation of Sweat Production by Pilocarpine Iontophoresis: A Noninvasive Screening Tool for Hypohidrosis in Ectodermal Dysplasia     

Surupa Basu  Monjori Mitra  Apurba Ghosh 《Indian journal of clinical biochemistry : IJCB》2013,28(4):433-435

Ectodermal dysplasia (ED) is a genetic disorder affecting the skin, hair, nails, teeth and sweat glands. The clinical presentation is heterogenous; however, hypohidrotic (reduced sweat) ectodermal dysplasia (HED) being the commonest. Also known as anhidrotic ED, sweat glands are sparse or rudimentary, leading to dysregulation of body temperature and episodes of uncontrolled hyperthermia due to reduced sweating. Of the many aids to document hypohidrosis in HED, we present here the technique of pilocarpine iontophoresis to induce, collect and measure sweat. Evaluation of sweat generated (against normally obtained values) is a non-invasive alternative to establish hypohidrosis in disorders such as HED. This augments clinical decision levels to plan skin biopsy for confirmation of diagnosis and facilitates patient management and early discharge. We present two cases of HED that were primarily diagnosed with sweat gland dysplasia using pilocarpine iontophoresis, and later confirmed with skin biopsy findings.  相似文献   

New educational technologies: Their impact on relationships of dependence and interdependence for Third World countries     

Ratna Ghosh 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1987,33(1):33-50

The widening gap between North and South is more than economic: it is a knowledge and power gap. The influence of the present information revolution on education in the West, unprecedented in its rate and scope of expansion, is increasing the information gap at an alarming rate. Should Third World countries use new educational technologies (NET) as a tool for development? Can they afford it? Will borrowing NET perpetuate the present dependency of the Third World? This paper argues that Third World countries will continue to be technologically dependent because of research and development in the West. The solution lies in the balance of power theory — selective transfer of NET appropriate for their level of development, to strengthen their bargaining position. Mass education and the development of indigenous technological capacity are implied. Bargaining capacity would reduce dependency, create greater interdependence and change the equation of power.  相似文献   

Nature watch     

Dipanjan Ghosh  Ayan Mondal 《Resonance》2016,21(2):173-188

The Sunderbans is the largest mangrove vegetation in the world. Changes in the environment, particularly driven by climate change, forewarn us of the dwindling diversity of exclusive mangrove plants and the charismatic animal species–especially the tiger. The Sunderbans, with its fast-changing geomorphic and hydrological character, is creeping towards its doomsday.  相似文献   

The RC circuit: An approach with Fourier transforms     

Mitrajyoti Ghosh 《Resonance》2016,21(11):1029-1042

In this article we shall mathematically analyse the Resistor-Capacitor (RC) circuit with the help of Fourier transforms (FT). This very general technique gives us a lot of insight into solving first order differential equations with source terms depending on time. In itself, the RC circuit is by far the most commonplace entity in modern electronics. But the method of FT is not the accepted custom for an electronic engineer, who is probably more comfortable working with complex impedances and phasors while solving problems in network analysis. In fact, what is used much more extensively is the Laplace transform. But a lot of things, (including the complex impedance itself, and some insight into complex analysis) can be understood better if we use the FT approach to solve the differential equations that come up in network analysis. The use of FT comes smoothly from first principles — precisely what we set out to demonstrate here.  相似文献