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Search Results: 1 - 10 of 1063 matches for " Vikas Shrivastava "
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TL Glow Curve Study, Kinetics, PL and XRD Analysis of Mn2+ Doped CaAl2O4 Phosphors  [PDF]
Jagjeet Kaur, Nemana Subramanyam Suryanarayana, Beena Jaykumar, Vikas Dubey, Ravi Shrivastava, Huma Nazli Baig
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.1111114
Abstract: The present paper reports Thermoluminescence (TL) Glow curve of Mn2+ doped CaAl2O4 phosphor with different UV exposure time. The Glow peak shows general order kinetics and evaluation of kinetic parameters was done by peak shape method. Calculations of Trap Depth were done with Chen’s different methods and order of kinetics, activation energy and frequency factor are calculated. The recorded glow curve shifts towards higher temperature with increasing intensity as a function of UV exposure time until 30 minutes where it is seen that the peak shifts towards low temperature side and intensity also decreases. The peaks were found at 345?C, 356.83?C, 358?C and 356.73?C respectively using the heating rate 6.7?C/s. The PL (photoluminescence) excitation spectra show peaks at 248 nm and 362 nm whereas emission spectra shows peaks between 364 nm and 551 nm. Sample was characterized by XRD technique.
Isolation and Characterization of Chitosan-Producing Bacteria from Beaches of Chennai, India
Kuldeep Kaur,Vikrant Dattajirao,Vikas Shrivastava,Uma Bhardwaj
Enzyme Research , 2012, DOI: 10.1155/2012/421683
Abstract: Chitosan is a deacetylated product of chitin produced by chitin deacetylase, an enzyme that hydrolyses acetamido groups of N-acetylglucosamine in chitin. Chitosan is a natural polymer that has great potential in biotechnology and in the biomedical and pharmaceutical industries. Commercially, it is produced from chitin via a harsh thermochemical process that shares most of the disadvantages of a multistep chemical procedure. It is environmentally unsafe and not easily controlled, leading to a broad and heterogeneous range of products. An alternative or complementary procedure exploiting the enzymatic deacetylation of chitin could potentially be employed, especially when a controlled and well-defined process is required. In this study, 20 strains of bacteria were isolated from soil samples collected from different beaches of Chennai, India. Of these 20 bacterial strains, only 2 strains (S3, S14) are potent degrader of chitin and they are also a good producer of the enzyme chitin deacetylase so as to release chitosan. 1. Introduction Chitin, a homopolymer of β (1,4)-linked N-acetyl-glucosamine, is one of the most abundant, easily obtained, and renewable natural biopolymers, second only to cellulose [1]. Chitin is considered the second most plentiful organic resource on the earth next to cellulose and is present in marine invertebrates, insects, fungi, and yeasts. Chitin and its derivatives have high economic value owing to their versatile biological activities and agrochemical applications [2, 3]. Chitin is not soluble in water or in the majority of organic solvents. However, chitosan, prepared from chitin (usually of crab or shrimp shell origin) through chemical N-deacetylation, is water soluble and possesses biological properties such as high biocompatibility and antimicrobial activities. Chitosan is widely used in medical applications including antitumor therapy and cholesterol control, in medicinal membranes, wound dressings, and controlled-released medicinal materials [4]. Recently, chitosan has also been used as a natural substance for the enhancement of seed germination and plant growth and also as an ecologically friendly biopesticide to boost the innate plant defense mechanisms against fungal infections. At present, chitosan is produced by the thermochemical deacetylation of chitin. Thus an envirofriendly bacterial strains-mediated method can be successfully used for the enzymatic deacetylation of chitin, especially when a controlled and well-defined process is required. Chitin deacetylase (CDA), first identified and partially purified from
Beam Dynamics and Electromagnetic Design Studies of 3 MeV RFQ for SNS Programme  [PDF]
Rahul Gaur, Purushottam Shrivastava
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.29068
Abstract: The physics design of a 3 MeV, 30 mA, 352.2 MHz Radio Frequency Quadrupole (RFQ) is done for the future Indian Spallation Neutron Source (ISNS) project at RRCAT, India. The beam dynamics design of RFQ and the error analysis of the input beam parameters are done by using standard beam dynamics code PARMTEQM. The electromagnetic stu-dies for the two-dimensional and three-dimensional cavity design are performed using computer codes SUPERFISH and CST Microwave Studio. The physics design of RFQ consisting of the beam dynamics design near the beam axis and the electromagnetic design for the RFQ resonator is described here.
Assessment of bone condition by acoustic emission technique: A review  [PDF]
Sharad Shrivastava, Ravi Prakash
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.23025
Abstract: The paper deals with the review of acoustic emission technique in biomedical field. The re-view is done with the aim to provide an overview of the use of AE technique in biomedical field, mainly concentrated on the AE behavior of bone under different loading conditions, its depend-ence on strain rate, in osteoporosis, monitoring the fracture healing process of bone. The over-all conclusion from the review was that almost all the studies in bone indicated that the initial AE occurs only in the plastic region and just prior to yield. That means the use of AE tech-nique for clinical application cannot be consid-ered as a safe technique, but the early occur-rence of AE events from callus promises the application of AE technique for monitoring the fracture healing process. The negligible effect of soft tissues on AE response of bone prom-ises AE to become a non-invasive method for assessment of bone condition.
Electron Beam Effects on Kinetic Alfven Waves in the Plasma Sheet Boundary Layer  [PDF]
G. Shrivastava, J. Shrivastava
Open Access Library Journal (OALib Journal) , 2014, DOI: 10.4236/oalib.1100518
Abstract: This work studies the effect of earthward electron beam on kinetic Alfven wave in plasma sheet boundary layer (PSBL). The particle aspect approach is adopted to investigate the trajectories of charged particles in the electromagnetic field of kinetic Alfven wave. Expressions are found for the dispersion relation, growth/damping-rate and associated currents in the presence of electron beam in homogenous plasma. Kinetic effects of electrons and ions are included to study kinetic Alfven wave because both are important in the transition region. The plasma parameters appropriate to plasma sheet boundary layer are used. It is found that downward electron beam affects the dispersion relation, growth/damping-rate and associated currents in both cases (warm and cold electron limit).
Mechanical Properties of Epoxy Resin – Fly Ash Composite  [PDF]
Manoj Singla, Vikas Chawla
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.93017
Abstract: There has been significant increase in use of glass fibre reinforced composites as structural materials in naval mine countermeasure surface ships. Sea mines when detonated emit underwater shock waves, which could impart severe loading to naval ship structure; there are attempts to model the response of a ship structure to this loading. For the model to be accurate & useful material property data determined experimentally by taking different weight percentage of glass fibers (E-300, mat form) with epoxy resin & comparison with fly ash reinforced composite. Specimens in the form of cube of size 10X10X10 (mm’s) are used & results are presented. Fracture behaviour of composite can also be studied using SEM. SEM analysis is done to observe distribution of fly ash particles in matrix, resin fly ash interface, glass fibre matrix interface, glass fibre distribution etc,.
Materialism, Fashion Involvement, Fashion Innovativeness and Use Innovativeness: Exploring Direct and Indirect Relationships  [PDF]
Vikas Gautam, Vikram Sharma
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.811158
Abstract: The objective of the current study was to examine the direct and indirect impacts of materialism on use innovativeness in case of fashion products among Indian consumers. An empirical study was conducted to test these relationships with 282 respondents comprised of 59 percent males and 41 percent of females. Proposed conceptual study model was tested with the help of higher order structural equation modeling by using IBM AMOS 21.0. We confirmed full mediation of fashion involvement in the relationship between materialism and use innovativeness. Furthermore, our study results found full mediation of fashion innovativeness in the relationship between materialism and use innovativeness. On the other hand, materialism had a direct significant negative impact on use innovativeness in case of fashion products. We strongly recommend to the fashion product marketers to highlight the concept of use innovativeness in the entire marketing mix for better business prospects.
IN VITRO STUDY OF ENTAMOEBA HISTOLYTICA CAUSATIVE AGENT OF AMOEBIASIS WITH LEMON JUICE AT DIFFERENT CONCENTRATION SHOWED ANTIAMOEBIC PROPERTIES
Shrivastava Bhanu,Shrivastava Vandana,Shrivastava Archana
International Research Journal of Pharmacy , 2011,
Abstract: A species of parasite protozoa Entamoeba histolytica causing amoebiasis and amoebic dysentery characteristic include a single nucleus containing a small central karyosome and peripheral chromatin that is finely and regularly beaded. This is a single celled parasitic animal, that infects predominantly humans and other primates. Amoebic infection was first described by Fedor Losch in 1875 in St. Petersburg. In 1890, Sir William Osler reported the first North American case of amoebiasis when he observed amoebae in stool in abscess fluid from physician who previously resided in Panama. So we used the Lemon juice (Citrus ) at different concentration against Entamoeba histolytica to treat the amoebiasis disease. Entamoeba histolytica shows the variety of growth due to the effect of Lemon juice (Citrus). Lemon juice is ingredient and it has antiamoebic properties against Entamoeba histolytica a causative agent of amoebiasis.
COMPARATIVE STUDY OF DIAGNOSTIC PROCEDURES IN SALMONELLA INFECTION, CAUSATIVE AGENT OF TYPHOID FEVER – AN OVERVIEW STUDY
Shrivastava Bhanu,Shrivastava Vandana,Shrivastava Archana
International Research Journal of Pharmacy , 2011,
Abstract: Typhoid fever is a prolonged and debilitating fever which is of major public health concern in many countries.Laboratory diagnosis of typhoid fever requires isolation and identification of Salmonella enterica serotype Typhi. In many areas where this disease is endemssssic, laboratory capability is limited. Recent advances in molecular immunology have led to the identification of sensitive and specific markers for typhoid fever and technology to manufacture practical and inexpensive kits for their rapid detection. Three commercial kits for serologic diagnosis of typhoid fever. Patients presenting with 4 days of fever were enrolled at two hospitals. Patients with serotype Typhi isolated from blood samples, and controls were patients with other laboratory-confirmed illnesses. This paper described following methods for diagnosis in case of typhoid fever, Laboratory analysis. (i) Blood culture (ii) Confirmation and antimicrobial susceptibility testing of isolates (iii) Investigation of stool culture (iv) Widal test. (v) Rapid tests (vi) A polymerase chain reaction (PCR)-based test.
A Study Of Achievement In English Of Boys & Girls Of Government & Non-government School At Middle Level
Pallavi Shrivastava
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: "Language in its widest sense means the sum total of such signs of our thoughts and feeling as are capableof external perception as could be produce and repeated at will."A.H. Gardiner.
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