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Search Results: 1 - 10 of 21437 matches for " Praveen Kumar Goteti "
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Prospective Zinc Solubilising Bacteria for Enhanced Nutrient Uptake and Growth Promotion in Maize (Zea mays L.)
Praveen Kumar Goteti,Leo Daniel Amalraj Emmanuel,Suseelendra Desai,Mir Hassan Ahmed Shaik
International Journal of Microbiology , 2013, DOI: 10.1155/2013/869697
Abstract: Zinc (Zn) is one of the essential micronutrients required for optimum plant growth. Substantial quantity of applied inorganic zinc in soil is converted into unavailable form. Zinc solubilising bacteria are potential alternates for zinc supplement. Among 10 strains screened for Zn solubilisation, P29, P33, and B40 produced 22.0?mm clear haloes on solid medium amended with ZnCO3. Similarly, P17 and B40 showed 31.0?mm zone in ZnO incorporated medium. P29 and B40 showed significant release of Zn in broth amended with ZnCO3 (17 and 16.8?ppm) and ZnO (18 and 17?ppm), respectively. The pH of the broth was almost acidic in all the cases ranging from 3.9 to 6.1 in ZnCO3 and from 4.1 to 6.4 in ZnO added medium. Short term pot culture experiment with maize revealed that seed bacterization with P29 @ 10?g·kg?1 significantly enhanced total dry mass (12.96?g) and uptake of N (2.268%), K (2.0%), Mn (60?ppm), and Zn (278.8?ppm). 1. Introduction Zinc is one of the imperative micronutrients required relatively in small concentrations (5–100?mg?kg?1) in tissues for healthy growth and reproduction of plants. Zinc deficiency in plants leads to reduced membrane integrity and synthesis of carbohydrates, auxins, nucleotides, cytochromes, and chlorophyll and develops susceptibility to heat stress [1]. Excessive use of zinc fertilizers also poses problems to humans causing the impaired absorption of iron and copper. It is also known to repress male sexuality [2]. The solubility of Zn is highly dependent upon soil pH and moisture and hence arid and semiarid areas of Indian agroecosystems are often zinc-deficient. In India, maize is grown in a wide range of environments, extending from extreme semiarid to subhumid and humid regions. It is grown in about 8.26?Mha with yield being 19.3?Mt (Ministry of Agriculture, Government of India). Voluminous literature indicates that Zn concentration in the grain is inherently very low, particularly when grown on Zn-deficient soils. The major reason for the widespread occurrence of Zn deficiency problems in crop plants is attributed to low solubility of Zn in soils rather than a low total amount of Zn [3]. Customary application of inorganic zinc partially caters the plant need as 96–99% of applied Zn is converted into different insoluble forms depending upon the soil types and physicochemical reactions within 7 days of application [4]. Microbes are potential alternate that could cater plant zinc requirement by solubilising the complex zinc in soil. Several genera of rhizobacteria belonging to Pseudomonas spp. and Bacillus spp. are reported to
Chaotic Properties on Time Varying Map and Its Set Valued Extension  [PDF]
Ayub Khan, Praveen Kumar
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.33051
Abstract: Every autonomous dynamical system X, finduces a set-valued dynamical system \"\"on the space of compact subsets of X. In this paper we have investigated some chaotic relations between a nonautonomous dynamical system and its set valued extension.
Comparison between Auditory and Visual Simple Reaction Times  [PDF]
Jose Shelton, Gideon Praveen Kumar
Neuroscience & Medicine (NM) , 2010, DOI: 10.4236/nm.2010.11004
Abstract: Objective: The purpose of this study was to find out whether the simple reaction time was faster for auditory or visual stimulus and the factors responsible for improving the performance of the athlete. Methodology: 14 subjects were as- signed randomly into groups consisting of 2 members. Both the members from each group performed both the visual and auditory tests. The tests were taken from the DirectRT software program from a laptop. The DirectRT software consists of Testlabvisual and Testlabsounds to test the reaction times to visual and auditory stimuli. The 2 members from each group completed both the visual and auditory reaction times, the data was taken and the mean reaction time was calculated excluding the first and last values. Results: The results show that the mean visual reaction time is around 331 milliseconds as compared to the mean auditory reaction time of around 284 milliseconds. Conclusion: This shows that the auditory reaction time is faster than the visual reaction time. And also males have faster reaction times when compared to females for both auditory as well as visual stimuli.
Evaluation of Stress Strain Patterns in a Stentless Aortic Valve and Its Leaflets  [PDF]
Gideon Praveen Kumar, Lazar Mathew
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.21007
Abstract: Objective: To design a new trileaflet aortic valve and investigate its mechanical behavior using finite ele- ment methods. Background: Quantification of aortic valve deformation during cardiac cycle is essential in understanding normal and pathological valvular function and eventually in the design of valves. We have designed and analyzed a new tissue valve model to investigate the mechanics of the valve and its components. Methods: Steps involves in 3D CAD based geometric modeling of a trileaflet aortic valve and the effects of different component dimensions on the mechanical behavior of valve is presented in this paper. Conceptual designing of individual components was used to build the total geometric model. Different physiological pressures were applied on the valve model and its deformation patterns were studied. Results: A new geometric model of a trileaflet aortic valve was designed. Its mechanical behavior was studied. Geometric analysis and simulation of these models enhanced the designer to optimize the geometry suitable for performance during and after implantation. Conclusion: The geometry-based model presented here allows determining quickly if the new set of valve component dimensions results in a functional valve. This is of great interest to designers of new prosthetic heart valve models, as well as to surgeons involved in valve- sparing surgery.
Finite element analysis of a percutaneous aortic valve stent design  [PDF]
Gideon Praveen Kumar, Lazar Mathew
Health (Health) , 2009, DOI: 10.4236/health.2009.11002
Abstract: Aim: This paper discusses the design and Finite Element Analysis (FEA) of a Percutaneous Aor-tic Valve Stent. The aim of this study was to model a percutaneous aortic valve stent and subject it to finite element analysis. The design process was carried out to meet the functional and surgical requirements. Methods and Results: Analysis was done with different materials with loads ranging from 50 kgf/mm² to 73 kgf/mm². These forces were selected because these val-ues are far greater than the normal human blood pressure which ranges from 10kPa to 16kPa. It was also to understand the mechanical behavior of different stent materials under such high pressures. A stent model was generated and its physical, mechanical and behavioral properties were studied. Finite element analysis and simulation of the model enhanced the designer to optimize the geometry suitable for perform-ance during and after implantation. The design objective for the stent is to have long term du-rability, low thrombogenicity, resistance to mi-gration and paravalvular leak. Conclusion: The analysis performed in this paper may aid in understanding the stent’s tolerable pressures ranges in comparison with the physiological pressures exerted by the heart and cardiac blood flow during abnormal cardiovascular conditions.
Sodium Bicarbonate—A Potent Ergogenic Aid?  [PDF]
Jose Shelton, Gideon V. Praveen Kumar
Food and Nutrition Sciences (FNS) , 2010, DOI: 10.4236/fns.2010.11001
Abstract: This report aims to look at the role of Sodium bicarbonate as a potent Ergogenic aid and its role in improving the performance of athletes. It includes the mechanism of action of sodium bicarbonate during high-intensity exercise. The report also shows the various types of athletes who can be benefited from sodium bicarbonate loading, evidences for improvement in performance, conflicting evidences, recommended dosages and side-effects for bicarbonate loading.
Comparison between static and dynamic warm-up exercise regimes on lower limb muscle power  [PDF]
Jose Shelton, G. V. Praveen Kumar
Health (Health) , 2009, DOI: 10.4236/health.2009.12019
Abstract: Aim: The purpose of this study was to compare static and dynamic warm-up regimes on lower limb muscle power and thereby the perform-ance of the individual. Methodology: Twenty eight (28) subjects were assigned into groups consisting of 2 members. From each group, 1 subject performed the static stretching and the other subject performed dynamic stretching as warm-up. This was followed by non-counter movement jumps on a force platform and the vertical jump heights were recorded. Data were analysed using one-way ANOVA and paired t-test at 0.05 alpha. Result: The results showed that dynamic stretching as warm-up causes significant increase (p=0.01) in the vertical jump height as compared to static stretching (p=0.03). Discussion: The increase in vertical jump height could be related to the increase in force pro-duction which plays an important role during the vertical jump test. On the other hand the decrease in vertical jump height following static stretching could be attributed to a decrease in the force production in the muscles. Conclusion: Dynamic warm-up increases the vertical lump height, whereas static stretching decreases the jump height of the athlete.
The Effect of Von Karman Vortex Street on Building Ventilation
P. Praveen Kumar
Lecture Notes in Engineering and Computer Science , 2009,
Abstract:
A Min-process Checkpointing Protocol for Deterministic Mobile Ad Hoc Networks
Praveen,Parveen Kumar
International Journal of Engineering Science and Technology , 2011,
Abstract: The mobile ad hoc network architecture consists of a set of mobile hosts that can communicate with each other without the assistance of a base station. Nodes within each other radio range communicate directly via wireless links while these which are far apart rely on other nodes to relay messages. Node mobility causes frequentchanges in topology. Fault-tolerance is an important design issue in building a reliable Ad hoc network. This paper considers checkpointing recovery schemes for the mobile ad-hoc network environment to introduce software based fault tolerance. In this paper we propose a new anti-message logging based non-intrusiveminimum process checkpointing scheme for ad hoc networks. We assume that it uses Cluster Based Routing Protocol (CBRP) which belongs to a class of Hierarchical Reactive routing protocols. It produces a consistent set of checkpoints; the algorithm makes sure that only minimum number of nodes in the cluster is required to take checkpoints; it uses very few control messages. Performance analysis shows that our algorithm outperforms the existing related works and is a novel idea in the field.
EPIDEMIOLOGICAL STUDY ON HEAD AND NECK MALIGNANCIES - A STUDY OF 150 CASES
SankaraNarayanan Gopalakrishnan,Praveen Kumar
Otolaryngology Online Journal , 2013,
Abstract: OBJECTIVE: In the present study we investigate the head and Neck Malignancy cases presenting to the ENT department of our Hospital, and analyze the same to give inputs as to the incidence of head and neck malignancies, the symptoms and stage of presentation, lifestyle and habits as contributory risk factors, identify ENT primary in neck secondaries, histopathological types and selection of best treatment.METHODS: Prospective analysis of 150 patients with newly diagnosed malignancies of nasopharynx, oropharynx, larynx, hypopharynx and ear.RESULTS: Most malignancies are common in patients greater than 40 years of age. 88% of cancer occur in males. Oropharynx cancer is the most common cancer in our study, with the commonest subsite as base of tongue. Supraglottic and pyriform fossa tumours are the commonest tumour in laryngeal and hypopharyngeal cancers respectively. The most common presentation is dysphagia. Synergistic effect of smoking and alcohol is seen in 50% of patients. Most of the cases were seen in stage III and IV except glottis cancer which is predominantly seen in stage I, almost all cases were squamous cell carcinoma.CONCLUSION:The results of our study were in conformity with other similar studies. In larynx, Supraglottic was more common as opposed to glottis in certain western studies. Analysis of various factors helps in early diagnosis and management.
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