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Search Results: 1 - 10 of 2944 matches for " Pandey SK "
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Phosphate uptake kinetics and its regulation in N2- fixing cyanobacterium Anabaena oryzae Fritsch under salt stress
SK Singh, V Pandey, KD Pandey
African Journal of Biotechnology , 2007,
Abstract: Phosphorous (P) starved cells of the cyanobacterium Anabaena oryzae showed higher phosphate uptake rates than P-sufficient cells. The P-uptake obeyed saturation kinetics. The Km value for Pdeficient cells was lower (54.34 mM) than P-sufficient cells (82.64 mM) while Vmax was higher in Pdeficient and lower in P-sufficient cells. Salinity (NaCl) stimulated phosphate uptake significantly in the cyanobacterium which is followed by greater amount of P-accumulation in the form of polyphosphate bodies. Inhibition of P-uptake in P-deficient cells was 45% in dark grown compared to light grown cells. P-uptake was inhibited 52 and 85% in culture treated with 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU; 10 mM) and carbonyl cyanide m-chloro phenylhydrazone (CCCP; 100 mM), respectively, suggesting that energy for uptake could be derived from oxidative phosphorylation and photophosphorelation.
Load frequency control of an asynchronous restructured power system: a fuzzy logic approach
SK Pandey, SP Singh, VP Singh
International Journal of Engineering, Science and Technology , 2012,
Abstract: This paper presents the analysis of load frequency control (LFC) of a two-area restructured power system interconnected via parallel ac/dc transmission links. Simulation results show that the limitations of PI controller can be overcome by including Fuzzy logic concept and thereby the dynamic performance can be improved substantially following a load change in any area. The dynamic responses for small perturbation have been observed with PI controller and fuzzy logic based PI controller and result of both have been compared.
Utilization of carbon and nitrogen sources by Streptomyces kanamyceticus M 27 for the production of an Anti bacterial antibiotic
A Pandey, A Shukla, SK Majumdar
African Journal of Biotechnology , 2005,
Abstract: We tested a number of carbon and nitrogen compounds for their effect on the production of an antibacterial antibiotic by Streptomyces kananmyceticus M27. Dextrose was found to be the most suitable carbon source, though maltose, sucrose, and soluble starch gave moderate yields. (NH4)H2PO4 and yeast extract were adequate nitrogen sources for antibiotic production. There was, however, no direct relation between the growth of the organism and antibiotic formation. The pH of the medium might be an important factor for antibiotic formation, as media giving high antibiotic yields showed an alkaline pH.
Fuzzy set theoretic approach to fault tree analysis
SK Tyagi, D Pandey, R Tyagi
International Journal of Engineering, Science and Technology , 2010,
Abstract: Research in conventional fault tree analysis (FTA) is based mainly on failure probability of basic events, which uses classical probability distributions for the failure probability of basic events. In the present paper the probabilistic consideration of basic events is replaced by possibilities, thereby leading to fuzzy fault tree analysis. Triangular and trapezoidal fuzzy numbers are used to represent the failure possibility of basic events. Since a system may have to go through different operating conditions during the design or testing phase. Thus the failure possibility of a basic event will be assigned more than one fuzzy numbers by different experts under various operating conditions. It is also well established that the selection of a fuzzy number to represent a basic event is vital in fault tree analysis. Here we developed an algorithm to find a single fuzzy number for a basic event, wherein more than one fuzzy number is assigned to that particular event. Using this algorithm, we obtain a single fuzzy number, having least variance from all fuzzy numbers assigned to the concerned event. The adequate and appropriate means and procedure for the detection of basic events having key role in the occurrence of top event in system analysis become essential. Here we have put forward an approach to rank the basic events in accordance with their importance in the occurrence of top event. This approach can be widely used to improve the reliability and to reduce the operating cost of a system. The proposed techniques are discussed and illustrated by taking an example of a nuclear power plant.
Bioactivity of the compounds in genus Dysoxylum

V Lakshmi,K Pandey,SK Agarwal,

生态学报 , 2009,
Abstract: The diets of the wolf Canis lupus, red fox Vulpes vulpes and raccoon dog Nyctereutes ussurienusis Matschie were studied in the grassland of eastern Inner Mongolia from August to October in 2007 and from March to July in 2008. Feces were collected from dens and latrines. The frequency of occurrence and the dry weight of the remains of each food item in the feces were calculated. Livestock (50.65% frequency of occurrence) constituted the bulk of the wolf diet, while small rodents (76.31% frequency of occurrence) were most frequently eaten by the foxes. Small rodents (22.69% frequency of occurrence) were important to the raccoon dogs but they also frequently consumed birds (39.81% frequency of occurrence) and insects (26.39% frequency of occurrence). The wolf was the most omnivorous and the red fox was the least omnivorous of these three kinds of canidae according to the diversity index. The food niches of the wolf and the red fox overlapped more than that of the raccoon dog and other species. These three kinds of canidae shared many resources and consequently competition occurred to them. However, their diets also differed to some extent which helped them to avoid competition. Furthermore, raccoon dogs were dormant in winter when food was scarce, which may be the reason why all these species could coexist in a rather unproductive grassland.
A HYBRID WIRELESS NETWORK MODEL FOR POST DISASTER RELIEF OPERATIONS
SK Dwivedi,NK Shukla,Sudhakar Pandey
International Journal of Soft Computing & Engineering , 2012,
Abstract: In the event of large scale natural disaster, most of the public utility services like communication, power and roads get disrupted. Post disaster relief operations need quick but reliable restoration of these services. Rapid and reliable deployment of communication setup is highly crucial to commence rescue and relief operations. Mobile Ad-hoc Networks (MANETs) can be built quickly but suffer from problems due to nodes mobility; on the other hand, Static Ad-hoc Networks (SANETs) can provide better performance but takes longer time to establish. This paper presents a Hybrid Network model having features like scalability, robustness, speedy deployment, portability, cost effective and desired QoS. The proposed Hybrid Ad-hoc Network (HANET) topology is a combination of static nodes of grid topology of SANET and the mobile nodes of random topology of MANET. In the recent past, many researchers have shown interest in the development of directional antenna based MAC protocols. Although directional antenna brings in advantages of higher transmission range, spatial reuse and so on but equally suffers from typical problems of hidden/exposed terminals, head-of-line blocking and deafness etc. In this paper, we have proposed a novel protocol based on the directional smart antenna to exploit the advantage of spatial reuse in terms of multiple concurrent transmissions while ensuring collision avoidance. Simulation results demonstrated that the throughput and end-to-end delay performances of the proposed MAC protocol with HANET model is significantly better than the legacy MANETs with IEEE 802.11-MAC.
Repeatabilty of general and specific combining ability effects of seedling and clonal generations in potato
Manivel P,Pandey SK,Singh SV
Electronic Journal of Plant Breeding , 2009,
Abstract: The relative magnitude of general combining ability (gca) and specific combining ability (sca) effects in three generations(years), viz. Seedling (SG), first clonal generation (FCG) and second clonal generation (SCG) for tuber yield, tuber number,average tuber weight and tuber dry matter of potato in a line x tester mating design (10 × 4) was studied. There were markeddifferences in the gca effects of 14 parents. GCA and SCA for various characters varied from generation to generation. Ingeneral the correlation between various generations was varied and general conclusion could be arrived except in case of gcaeffects of males for dry matter. Considering the consistent performance over various generations for general combiningability, genotypes viz., MP/92-136, MP/91-65 and MP/90-95 for tuber yield and MP/92-136 for tuber number, Kufri Jyoti,for average tuber weight and MP/91-65 and QB/A-9-120 for dry matter were good general combiners, both in seedling andclonal generation. Similarly the crosses with consistent performance of specific combining ability over generations are crossMP/92-136 x Kufri Chipsona-1 for tuber yield and average tuber weight and QB/A-9-120 x MP/90-94 for tuber number anddry matter, were consistently good specific combiners in all generations. The variation in general combining ability effectsover generation observed in the present study for tuber dry matter can be attributed to genotype × environment interaction.Hence, combining ability to select suitable parents for potato breeding has to be done based over years/generations. Parentsand crosses with consistent performance over generations and those specifically suitable for breeding for processing qualitywere identified.
Antibacterial activity of seed extracts of Argemone mexicana L. on some pathogenic bacterial strains
SK Singh, VD Pandey, A Singh, C Singh
African Journal of Biotechnology , 2009,
Abstract: Antibacterial activity of seed extracts of Argemone mexicana L. (Papaveraceae) was evaluated against some pathogenic bacterial strains. Chloroform extract of seeds exhibited varying level of antibacterial activity, with minimum inhibitory concentrations (MIC) of 2.0 - 5.0 mg/ml, against both Gram-positive and Gram-negative bacteria. The chloroform extract was found to be more active than the other extracts against all the test bacteria. MIC values were 2.0 and 3.0 mg/ml, respectively, for Staphylococcus aureus and Pseudomonas aeruginosa and their respective drug-resistant strains. The sensitivity of the test bacteria varied with the species and strains. The study provides basis for the isolation and purification of antibacterial compound(s) from the seeds of A. mexicana L.
Cognitive Rehabilitation in Stroke Cases
Pandey SK,Iswarari S,Ballav A,Kumar R
Indian Journal of Physical Medicine and Rehabilitation , 2009,
Abstract: In the conducted study, we observed the effect ofcognitive rehabilitation in the stroke patients. Strokepatients irrespective of gender, attending physicalmedicine and rehabilitation OPD and stroke clinic wereincluded in study. Cognitive ability was assessed clinicallyusing relevant assessment scales (MMSE, ACER,) andvarious tasks. Assessment of patients was done at threemonthly intervals (0, 3, 6, 9 months) the results werecompared with control group and analysed by appropriatestatistical methods.There was a significant improvement, in cognitive statusafter 9 month from the from the base line value (paired ttest) in both cases and controls. However, statisticalanalysis failed to show any significant intergroupdifference.
Rehabilitation of a Patient with Alkaptonuric (Ochronotic) Arthritis
Das KM,Chakraborty K,Pandey SK,Middya AK
Indian Journal of Physical Medicine and Rehabilitation , 2007,
Abstract: A 54-year old male presented with chronic low back pain without radiation and significant early morningstiffness of 10 years duration and pain in both knees for the last 5 years. History revealed black staining ofinnerwear (brief) following micturation since childhood. On physical examination, kyphoscoliosis, paraspinalmuscle imbalance, restriction of the ROM of lumbosacral spine, knee tenderness and pigmentation of earand sclera were found. Radiologic features like narrowing of disc space with disc calcification and fusion ofdisc in lumbosacral segment, osteoarthritis of knee pointed towards the diagnosis and biochemical findingof positive urinary homogentisic acid confirmed the diagnosis of alkaptonuric (ochronotic) arthritis.Prophylactic dose of ascorbate was started. Initially NSAID and later acetaminophen were used for paincontrol. Spinal orthosis was given and therapeutic exercise programme instituted. Analgesic use was significantly reduced after 3 months. VAS (pain) score, WOMAC score, hand to floor distance, 50 feet walktime, Patient & Physician Global Assessment etc. were used to monitor LBP and knee pain. All the outcome measurement tools showed significant improvement at 3, 6, 9 and 12 months. Patient’s work place fitness also improved significantly as measured by the number of sick leaves per month.
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