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Search Results: 1 - 10 of 462113 matches for " A. Chaturvedi "
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Hydro cracking for Maximizing Middle Distillates
Chaturvedi A
International Journal of Scientific Research and Reviews , 2013,
Abstract: A simplified description of hydrocracking is the decomposition of hydrocarbons on the acid sites ofthe catalyst’s support, followed by hydrogenation of the cracking products on the metallic sites. The firststage of this process is analogous to catalytic cracking. Basically, the aim of hydrocracking as well as othercracking processes is the transformation of the heavy fractions of crude oil into light fractions. The use ofthis process is determined by the high quality of some of the products obtained, such as the jet fuel and thelubricating oils of high viscosity index. It is more expensive than catalytic cracking due to the high price ofhydrogen and operation at high pressure. In addition, the role of hydrocracking increased due to the newrequirements for gasoline. Following paper reviews this excellent process used in Petroleum Refineries.Hydrocracking plants are capable of processing a wide variety of feedstocks of different characteristics toproduce a broad range of products. They can be designed and operated to maximize the production of agasoline blending component (called hydrocrackate) or to maximize the production of diesel oil.
Bio-diesel waste as tailored organic fertilizer for improving yields and nutritive values of Lycopercicum esculatum (tomato) crop
Chaturvedi,S; Kumar,A;
Journal of soil science and plant nutrition , 2012, DOI: 10.4067/S0718-95162012005000033
Abstract: the present study focused on utilization of the de-oiled jatropha cake, a bio-waste from the bio diesel extraction process, as organic fertilizer. tomato crop was subjected to different treatments comprising varying composition of the jatropha cake fertilizer, applied at varying age of plant life-cycle. the impact on yield, morphological and nutritional parameters was studied. results revealed that an optimal (2-3 % by weight) dose applied on the soil at the time of onset of flowering (around 45 days), significantly enhanced the yield along with improvements in morphological parameters. there were significant improvements in key nutrients viz. protein, vitamin c and reducing sugars. high value of key nutrients like tss (total soluble solid), vitamin c, proteins, reducing sugar and tomato fruit yield were obtained with soil + 3% cake mixed in 60 day transplant. these results indicate that composted de-oiled jatropha cake has tremendous potential of being utilized in a cost effective way as tailored organic fertilizer, as a replacement of chemical fertilizers.
Bio-diesel waste as tailored organic fertilizer for improving yields and nutritive values of Lycopercicum esculatum (tomato) crop
Chaturvedi,S; Kumar,A;
Journal of soil science and plant nutrition , 2012, DOI: 10.4067/S0718-95162012005000033
Abstract: the present study focused on utilization of the de-oiled jatropha cake, a bio-waste from the bio diesel extraction process, as organic fertilizer. tomato crop was subjected to different treatments comprising varying composition of the jatropha cake fertilizer, applied at varying age of plant life-cycle. the impact on yield, morphological and nutritional parameters was studied. results revealed that an optimal (2-3 % by weight) dose applied on the soil at the time of onset of flowering (around 45 days), significantly enhanced the yield along with improvements in morphological parameters. there were significant improvements in key nutrients viz. protein, vitamin c and reducing sugars. high value of key nutrients like tss (total soluble solid), vitamin c, proteins, reducing sugar and tomato fruit yield were obtained with soil + 3% cake mixed in 60 day transplant. these results indicate that composted de-oiled jatropha cake has tremendous potential of being utilized in a cost effective way as tailored organic fertilizer, as a replacement of chemical fertilizers.
Isolation of a strain of Pseudomonas putida capable of metabolizing anionic detergent sodium dodecyl sulfate (SDS)
V Chaturvedi,A Kumar
Iranian Journal of Microbiology , 2011,
Abstract: Background and objectives: Sodium Dodecyl Sulfate (SDS) is one of the most widely used anionic detergents. The present study deals with isolation and identification of SDS-degrading bacteria from a detergent contaminated pond situated in Varanasi city, India."nMaterials and Methods: Employing enrichment technique in minimal medium (PBM), SDS-degrading bacteria were isolated from pond water sample. Rate of degradation of SDS was studied in liquid PBM and also degradation of different concentrations of SDS was also studied to find out maximum concentration of SDS degraded by the potent isolates. Alkyl sulfatase activity (key enzyme in SDS degradation) was estimated in crude cell extracts and multiplicity of alkyl sulfatase was studied by Native PAGE Zymography. The potent isolate was identified by 16S rRNA sequence analysis."nResults: Using enrichment technique in minimal medium containing SDS as a sole carbon source, initially three SDS degrading isolates were recovered. However, only one isolate, SP3, was found to be an efficient degrader of SDS. It was observed that this strain could completely metabolize 0.1% SDS in 16 h, 0.2% SDS in 20 h and 0.3% SDS in 24 h of incubation. Specific activity of alkyl sulfatase was 0.087±0.004 μmol SDS/mg protein/min and Native PAGE Zymography showed presence of alkyl sulfatase of Rf value of 0.21. This isolate was identified as Pseudomonas putida strain SP3."nConclusion: This is the report of isolation of SDS-degrading strain of P. putida, which shows high rate of SDS degradation and can degrade up to 0.3% SDS. It appears that this isolate can be exploited for bioremediation of this detergent from water systems.
Locked-in syndrome during stellate ganglion block
Chaturvedi A,Dash H
Indian Journal of Anaesthesia , 2010,
Abstract: Intra-arterial injection of a local anaesthetic during stellate ganglion blockade may cause life-threatening complications. The usual complications are apnoea, unconsciousness and seizures. However, occasionally an unusual complication, ′locked-in′ syndrome, has also been reported. In this syndrome the patients remain conscious despite their inability to move, breathe or speak. Here we describe a patient who developed features akin to the locked-in syndrome along with severe hypotension and bradycardia, after an injection of only 2 ml of lignocaine during a stellate ganglion block.
Bio-diesel waste as tailored organic fertilizer for improving yields and nutritive values of Lycopercicum esculatum (tomato) crop
S Chaturvedi,A Kumar
Journal of Soil Science and Plant Nutrition , 2012,
Abstract: The present study focused on utilization of the de-oiled Jatropha cake, a bio-waste from the bio diesel extraction process, as organic fertilizer. Tomato crop was subjected to different treatments comprising varying composition of the Jatropha cake fertilizer, applied at varying age of plant life-cycle. The impact on yield, morphological and nutritional parameters was studied. Results revealed that an optimal (2-3 % by weight) dose applied on the soil at the time of onset of flowering (around 45 days), significantly enhanced the yield along with improvements in morphological parameters. There were significant improvements in key nutrients viz. protein, vitamin C and reducing sugars. High value of key nutrients like TSS (total soluble solid), vitamin C, proteins, reducing sugar and tomato fruit yield were obtained with soil + 3% cake mixed in 60 day transplant. These results indicate that composted de-oiled Jatropha cake has tremendous potential of being utilized in a cost effective way as tailored organic fertilizer, as a replacement of chemical fertilizers.
Effect of gabapentin premedication on preoperative anxiety and postoperative pain
L Pathak,A Chaturvedi
Health Renaissance , 2013, DOI: 10.3126/hren.v11i3.9642
Abstract: Background : In addition to chronic pain and anxiety disorders, few studies have found promising role of gabapentin in relieving acute postoperative pain as well as acute anxiety too. Objectives : To evaluate the effect of gabapentin premedication on preoperative anxiety and postoperative pain in patients undergoing elective open cholecystectomy. Methods : A prospective, randomized, double blind and placebo controlled study. Eighty adult patients of ASA I and II were divided into 2 groups of 40 each. Patients in group 1 and group 2 received capsules Gabapentin (1200mg) or identical placebo capsules 2 hours prior to surgery respectively. Preoperative anxiety and 12 hours postoperative pain was assessed using Anxiety and Pain VAS score respectively along with the observation of side effects. Postoperatively, intravenous pethidine 0.5 mg/kg was given when pain VAS > 40mm and time to first pethidine injection and total pethidine consumption in 12 hours was recorded. Results : Anxiety VAS scores after one hour of drug intake (35.75±20.11 versus 46.63±12.73) and just before induction of anaesthesia (45.75±30.27versus 68.13±29.84) along with postoperative Pain VAS scores were significantly lower in gabapentin group. Time to the first pethidine demand was significantly longer (145.34±194.54 min versus 26.30±51.02min) and cumulative pethidine consumption throughout study period was also significantly lower (35.91 ± 16.61 versus 57.84 ± 20.72mg) in gabapentin group. Conclusions : 1200 mg gabapentin premedication in open cholecystectomy patients significantly reduced preoperative anxiety, postoperative pain and total pethidine consumption with negligible side effects. DOI: http://dx.doi.org/10.3126/hren.v11i3.9642 Health Renaissance 2013;11(3):254-259
Conditional Entropy based User Selection for Multiuser MIMO Systems
Gaurav Gupta,A. K. Chaturvedi
Computer Science , 2013, DOI: 10.1109/LCOMM.2013.070113.131393
Abstract: We consider the problem of user subset selection for maximizing the sum rate of downlink multi-user MIMO systems. The brute-force search for the optimal user set becomes impractical as the total number of users in a cell increase. We propose a user selection algorithm based on conditional differential entropy. We apply the proposed algorithm on Block diagonalization scheme. Simulation results show that the proposed conditional entropy based algorithm offers better alternatives than the existing user selection algorithms. Furthermore, in terms of sum rate, the solution obtained by the proposed algorithm turns out to be close to the optimal solution with significantly lower computational complexity than brute-force search.
RiDs db: Repeats in diseases database
Anurag Chaturvedi,Shrish Tiwari,Rachel A Jesudasan*
Bioinformation , 2011,
Abstract: The non-coding fraction of the human genome, which is approximately 98%, is mainly constituted by repeats. Transpositions, expansions and deletions of these repeat elements contribute to a number of diseases. None of the available databases consolidates information on both tandem and interspersed repeats with the flexibility of FASTA based homology search with reference to disease genes. Repeats in diseases database (RiDs db) is a web accessible relational database, which aids analysis of repeats associated with Mendelian disorders. It is a repository of disease genes, which can be searched by FASTA program or by limited- or free-text keywords. Unlike other databases, RiDs db contains the sequences of these genes with access to corresponding information on both interspersed and tandem repeats contained within them, on a unified platform. Comparative analysis of novel or patient sequences with the reference sequences in RiDs db using FASTA search will indicate change in structure of repeats, if any, with a particular disorder. This database also provides links to orthologs in model organisms such as zebrafish, mouse and Drosophila.
Spirituality, distress, depression, anxiety, and quality of life in patients with advanced cancer
Kandasamy A,Chaturvedi S,Desai G
Indian Journal of Cancer , 2011,
Abstract: Objective: To study the influence of spiritual well being (Sp WB) on symptoms of distress, depression, and other dimensions of quality of life in advanced cancer patients receiving palliative care. Materials and Methods: The study was cross-sectional in nature. Fifty patients with advanced cancer from a hospice were assessed with the following instruments: the visual analog scale for pain (VAP), M.D. Anderson symptom inventory (MDASI), Hospital Anxiety Depression Scale (HADS), Functional assessment of cancer therapy - Palliative Care (FACT-pal), and Functional assessment of chronic illness therapy-spiritual well-being (FACIT-sp). We studied the correlations between spirituality and other variables on these scales. Results: Depression and anxiety were negatively correlated with spiritual well-being (Sp WB). Sp WB was significantly correlated with fatigue (r = -0.423, P = 0.002), symptom distress (r = -0.717, P < 0.001), memory disturbance (r = -0.520, P < 0.001), loss of appetite (r = -0.399, P = 0.004), drowsiness (r = -0.400, P = 0.004), dry mouth (r = -0.381, P = 0.006), and sadness (r = -0.720, P < 0.001). Sp WB was positively correlated with all the other aspects of QOL measures. Predictors such as palliative care well-being (t = 2.840, P = 0.008), distress (t = -2.582, P = 0.015), sadness (t = -2.765, P = 0.010), mood (t = 2.440, P = 0.021), and enjoyment in life (t = -3.586, P = 0.001) were significantly correlated with Sp WB, after regression analysis. Conclusions: This study suggests that spiritual well being is an important component of the quality of life of advanced cancer patients, and is closely related to the physical and psychological symptoms of distress. It should be addressed appropriately and adequately in palliative care settings.
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