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Search Results: 1 - 10 of 3470 matches for " Iswar Man Amatya "
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Impact of Temperature on Biological Denitrification Process
Iswar Man Amatya,Bhagwan Ratna Kansakar,Vinod Tare,Liv Fiksdal
Journal of the Institute of Engineering , 2009, DOI: 10.3126/jie.v7i1.2070
Abstract: Nitrate removal in groundwater was carried out by biological method of denitrification process. The denitrification and without denitrification were performed in two different sets of reactors. Each reactor consists of two columns connected in series packed with over burnt bricks as media. The filtration rate varied from 5.3 to 52.6 m/day for denitrification process. The ammonia, nitrate and nitrite nitrogen concentrations were measured at inlet, intermediate ports and outlet. The temperature varied from 10 to 30°C at 2°C intervals. The results demonstrated that high amount of nitrate nitrogen removed in groundwater at denitrification process. The nitrate nitrogen removed by denitrification varied from 3.50 to 39.08 gm/m3/h at influent concentration from 6.32 to 111.04 gm/m3/h. Denitrification was found more significant above 16°C. Key words: Over burnt brick, Denitrification, Filtration rate and Temperature Journal of the Institute of Engineering , Vol. 7, No. 1, July, 2009?pp. 121-126 doi: 10.3126/jie.v7i1.2070 ?
Role of pH on biological Nitrification Process
Iswar Man Amatya,Bhagwan Ratna Kansakar,Vinod Tare,Liv Fiksdal
Journal of the Institute of Engineering , 2011, DOI: 10.3126/jie.v8i1-2.5102
Abstract: It is important to determine the effect of changing environmental conditions on the microbial kinetics for design and modeling of biological treatment processes. In this research, the kinetics of ammonia oxidation by nitrifying process bacteria under varying pH and temperature conditions are studied. Ammonia oxidation in groundwater was carried out by biological method of nitrification process. The nitrification was performed in one set of reactors. The reactor consists of two columns connected in series packed with over burnt bricks as media. The filtration rate varied from 10.5 to 210.4 m/day for nitrification process respectively. The ammonia, nitrate and nitrite nitrogen concentrations were measured at inlet, intermediate ports and outlet. The temperature varied from 10 to 30°C at 2°C intervals. The results demonstrated that high amounts of ammonia nitrogen nitrified in groundwater at nitrification process. The average ammonia nitrogen oxidation efficiency of 77.27% was achieved from pH 7.3 to 8.0 in the reactor packed with OBB media at 20°C, for the flow rate 500ml/min due to biological nitrification. The total amount of ammonia nitrogen removed by nitrification varied from 0.76 to 17.80 gm/m 3 /h at influent concentration from 2.84 to 149.28 gm/m 3 /h. Key words: Over burnt brick; Filtration rate; Temperature; Nitrification and Nitrifying bacteria DOI: http://dx.doi.org/10.3126/jie.v8i1-2.5102 Journal of the Institute of Engineering Vol. 8, No. 1&2, 2010/2011 Page: 119-125 Uploaded Date : 20 July, 2011
Monitoring and Enforcement Must Back Any Policy Incentive Pertaining to Invasive Alien Species (IAS) Management
Pradyumna Amatya,Nicole McCoy
Ecology and Society , 2002,
Abstract:
Exposure to Hypobaric Hypoxia and Reoxygenation Induces Transient Anxiety-Like Behavior in Rat  [PDF]
Iswar Baitharu, Vishal Jain, Satya Narayan Deep, Gaurav Kumar, Govindasamy Ilavazhagan
Journal of Behavioral and Brain Science (JBBS) , 2013, DOI: 10.4236/jbbs.2013.38063
Abstract:

Chronic exposure to hypobaric hypoxia (HH) causes memory impairment and prolonged state of mental confusion. However, effect of high altitude exposure on mood state and its underlying mechanisms have been poorly studied.  Present study was undertaken to investigate the mood state alteration following chronic exposure to HH. Male Sprague Dawley rats were divided into five groups and exposed to hypoxia for 3, 7, 14 and 21 days in an animal decompression chamber at an altitude of 25,000ft. Anxiety-and depression-like behaviors were assessed by using various mazes along with changes in serotonin and glutamate level. Our study revealed a decrease in exploratory, grooming and rearing behavior in open field test following initial exposure to HH for 7 days without affecting the locomotory behavior. Initial exposure to HH-decreased time spent in open arm of elevated plus maze indicating induction of anxiety-like behavior which normalized on prolonged hypoxic exposure for 21 days. Hypoxic exposure for 7 days induced anhedonia and increased despair behavior in rat while there was steady improvement in these behaviors when exposed for 21 days. Decrease in serotonin level was noted in hippocampus along with elevated corticosterone and glutamate level which gradually decreased on prolonged exposure to HH. These findings suggest that initial exposure to HH increases transient anxiety-like behavior in rats followed by gradual improvement in mood state on prolonged exposure. Further, the study also indicates the involvement of serotonergic system in mood state alteration at high altitude following chronic exposure and reoxygenation.

Mapping of Aluminous Rich Laterite Depositions through Hyper Spectral Remote Sensing  [PDF]
M. J. Ratnakanth Babu, E. N. Dhanamjaya Rao, Lalitha Kallempudi, Das Iswar Chandra
International Journal of Geosciences (IJG) , 2018, DOI: 10.4236/ijg.2018.92006
Abstract:
Increased dimensionality of the satellite data proves to be very useful for discriminating features with very close spectral matching. Present study concentrates on the retrieval of reflectance spectra from the level one radiometrically corrected data in Koraput district (Orissa) for the Bauxite ore. In the present study, atmospheric correction model FLAASH has been used to retrieve reflectance from the radiance data. Preprocessing of the dataset has been done before applying atmospheric correction on the dataset. Spectral subsetting of noise prone bands has been successfully done. Local destriping of the affected bands has been done using a 3*3 local mean filter. Spectral signatures of samples were derived from the processed data. Spectral signature of each sample and derived features vectors were correlated with the satellite image of the area and distribution of each feature was demarcated. Spatial abundance of each feature was used in preparation of mineral abundance map. Accuracy of the map was assessed using training sets of representative geological units. The mineral abundance mapping using the spectral analysis of the reflectance image involves the endmember collection using the N-Dimensional visualizer tool in ENVI software. Laterite, Bauxite, Iron and silica rich Aluminous laterite soil, Alluvium and Forest were selected as the end members after understanding the geology and analysis of the reflectance image. Various mapping techniques were applied to generate the final classified mineral abundance Map, Linear Spectral Unmixing, Mixture Tune Matched Filtering, Spectral Feature Fitting, Spectral Angle Mapper were the techniques used. Results have revealed the ability of Hyper spectral Remote sensing data for the identification and mapping of Hydrothermal altered products like Bauxite, Aluminous Laterite. This technology can be utilized for targeting minerals in the altered zone.
Application of LiDAR Data for Hydrologic Assessments of Low-Gradient Coastal Watershed Drainage Characteristics  [PDF]
Devendra Amatya, Carl Trettin, Sudhanshu Panda, Herbert Ssegane
Journal of Geographic Information System (JGIS) , 2013, DOI: 10.4236/jgis.2013.52017
Abstract:

Documenting the recovery of hydrologic functions following perturbations of a landscape/watershed is important to address issues associated with land use change and ecosystem restoration. High resolution LiDAR data for the USDAForestServiceSanteeExperimentalForestin coastalSouth Carolina,USAwas used to delineate the remnant historical water management structures within the watersheds supporting bottomland hardwood forests that are typical of the re- gion. Hydrologic functions were altered during the early1700s agricultural use period for rice cultivation, with changes to detention storage, impoundments, and runoff routing. Since late1800’s, the land was left to revert to forests, without direct intervention. The resultant bottomlands, while typical in terms of vegetative structure and composition, still have altered hydrologic pathways and functions due to the historical land use. Furthermore, an accurate estimate of the watershed drainage area (DA) contributing to stream flow is critical for reliable estimates of peak flow rate, runoff depth and coefficient, as well as water and chemical balance. Peak flow rate, a parameter widely used in design of channels and cross drainage structures, is calculated as a function of the DA and other parameters. However, in contrast with the upland watersheds, currently available topographic maps and digital elevation models (DEMs) used to estimate the DA are not adequate for flat, low-gradient Coastal Plain (LCP) landscape. In this paper we explore a case study of a 3rd order watershed (equivalent to 14-digit hydrologic unit code (HUC)) at headwaters of east branch of Cooper River draining to Charleston Harbor, SC to assess the drainage area and corresponding mean annual runoff coefficient based on various DEMs including LiDAR data. These analyses demonstrate a need for application of LiDAR-based DEMs together with field verification to improve the basis for assessments of hydrology, watershed drainage characteristics, and modeling in the LCP.


Staphylococcal Colonisation of Intravenous Cannula and Antimicrobial Patterns of Isolated Staphylococcus Species
R Mahto,J Amatya,R Amatya,D Adhikari
Nepal Journal of Science and Technology , 2013, DOI: 10.3126/njst.v14i2.10426
Abstract: Cannula-related infections are amongst the most important nosocomial infections. Staphylococcus aureus and coagulase negative Staphylococci (CONS) are the most frequent causes of colonizing the intravenous cannula through which infection may occur. The aim of the study was to isolate the colonized staphylococci and to study the antimicrobial sensitivity pattern against them. Cultures of cannula tips were raised by semi-quantitative method. Antibiotic susceptibility test was performed by Kirby Bauer disc diffusion method as per The Clinical and Laboratory Standard Institute (CLSI) guidelines. Coagulase positive Staphylococcus was confirmed by coagulase slide test followed by tube test. CONS were distinguished by novobiocin sensitivity test. Out of 200 samples of cannula tips collected and processed, 45 (22.5%) isolates were S. aureus, 15 (7.5%) were S. epidermidis and 16 (8%) were other CONS . The highest occurance (30.7%) of S. aureus and the CONS (18.4%) was found in the nephrology ward and the surgical ward respectively. All the 76 isolates were tested for antimicrobial susceptibility pattern. Novobiocin was used to differentiate S. epidermidis from other CONS . All isolates were sensitive to ampicillin and ofloxacin. Out of total, 46.7% isolates of S. aureus and 12.9% isolates of CONS were multidrug resistant; 35.5% and 20 % isolates of S. aureus were oxacillin (methicillin) resistant and vancomycin resistant respectively. Four (12.9%) isolates of CONS [2(13.3%) of other CONS and 2(12.5%) of S. epidermidis ] were oxacillin (methicillin) and vancomycin resistant. In our study, vancomycin resistant staphylococci were found and it was concluded that the precautions for inserting intravenous cannula is necessary as different kinds of pathogens may colonize such devices. DOI: http://dx.doi.org/10.3126/njst.v14i2.10426 ? Nepal Journal of Science and Technology Vol. 14, No. 2 (2013) 131-136
A Buoyancy-Based Screen of Drosophila Larvae for Fat-Storage Mutants Reveals a Role for Sir2 in Coupling Fat Storage to Nutrient Availability
Tania Reis ,Marc R. Van Gilst,Iswar K. Hariharan
PLOS Genetics , 2010, DOI: 10.1371/journal.pgen.1001206
Abstract: Obesity has a strong genetic component, but few of the genes that predispose to obesity are known. Genetic screens in invertebrates have the potential to identify genes and pathways that regulate the levels of stored fat, many of which are likely to be conserved in humans. To facilitate such screens, we have developed a simple buoyancy-based screening method for identifying mutant Drosophila larvae with increased levels of stored fat. Using this approach, we have identified 66 genes that when mutated increase organismal fat levels. Among these was a sirtuin family member, Sir2. Sirtuins regulate the storage and metabolism of carbohydrates and lipids by deacetylating key regulatory proteins. However, since mammalian sirtuins function in many tissues in different ways, it has been difficult to define their role in energy homeostasis accurately under normal feeding conditions. We show that knockdown of Sir2 in the larval fat body results in increased fat levels. Moreover, using genetic mosaics, we demonstrate that Sir2 restricts fat accumulation in individual cells of the fat body in a cell-autonomous manner. Consistent with this function, changes in the expression of metabolic enzymes in Sir2 mutants point to a shift away from catabolism. Surprisingly, although Sir2 is typically upregulated under conditions of starvation, Sir2 mutant larvae survive better than wild type under conditions of amino-acid starvation as long as sugars are provided. Our findings point to a Sir2-mediated pathway that activates a catabolic response to amino-acid starvation irrespective of the sugar content of the diet.
Study on Environmental and Economic Development in Guangdong Province  [PDF]
Man Zhang
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.52005
Abstract: With the continuous economic and social development and progress, Guangdong Province, while maintaining rapid economic growth, environmental conditions are deteriorating. Therefore, it is of great significance to study the coordinated development of ecological environment and economy in Guangdong. While the Environmental Kuznets Curve is the curve describing the relationship between environmental pressure and income per capita, this paper briefly introduces the research background and significance of this topic and the status quo of domestic and foreign research, and then introduces the economic development and the status of environmental quality of Guangdong. Then, it uses the EKC model to analyze the relationship between economic growth and environmental pollution in Guangdong, and analyzes shape and position of the EKC of Guangdong. Finally, it provides some suggestions for the coordinated development of environment and economy in Guangdong.
Syncephalastrum species producing mycetoma-like lesions
Amatya Ritu,Khanal Basudha,Rijal Arpana
Indian Journal of Dermatology, Venereology and Leprology , 2010,
Abstract:
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