Vikrama Simhapuri University
Nellore, India

Vikrama Simhapuri University is a university located in the Nellore district of Andhra Pradesh, India. The university was established in 2008 with six courses. Now, the university is offering 17 Post Graduate courses in University College. Wikipedia.

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Madhuri K.V.,University of the Humanities | Prabhakar K.V.,Vikrama Simhapuri University
Oriental Journal of Chemistry | Year: 2014

Bacterial polysaccharides that are secreted into the environment are termed as exopolysaccharides (EPSs). Depending on the monosaccharide composition, EPSs can be classified into homo (HoPSs) and heteropolysaccharides (HePSs). HoPSs consist of only one type of monosaccharide, mostly glucose or fructose. In the recent years, EPSs have drawn increasing attention of the researchers worldwide, not only for their thickening, texturizing and viscosifying properties, but also for their health promoting applications. These EPSs constitute an alternative class of biothickeners, which have also been proved to have good emulsifying property, apart from their texture promoting ability in various foods. The biochemical properties of the EPSs depend on the primary structure of the EPSs. Hence it is very important to know the monomeric composition of the EPSs and their gycosidic bonds. HPLC, GC, GC-MS, NMR, Capillary electrophoresis and various bioinformatics tools can be used to determine the chemical characteristics of the EPSs.

Madhuri K.V.,University of the Humanities | Vidya Prabhakar K.,Vikrama Simhapuri University
Oriental Journal of Chemistry | Year: 2014

Many bacteria synthesize extracellular polysaccharides (EPSs) with commercially significant physiological and therapeutic activities. Microbial polysaccharides have also been reported to have potential therapeutic applications. Recently, much attention has been devoted to the microbial exopolysaccharides (EPSs) due to their numerous health beneûts.EPSs from lactic acid bacteria are reported to possess antitumor effects, immunostimulatory activity, and the ability to lower blood cholesterol. EPSs also over an alternative class of biothickeners that are widely used in the food and dairy industries and have been proven to provide strong emulsifying activity, which is important in many food formulations. It is also important to understand the mechanism of microbial biosynthesis of EPSs in order to enhance their production by genetic alterations. The potential applications and the mode of microbial biosynthesis of the EPSs have been presented in this article.

Lo H.-H.,National Dong Hwa University | Gopal N.O.,National Dong Hwa University | Gopal N.O.,Vikrama Simhapuri University | Sheu S.-C.,Chang Jung Christian University | Ke S.-C.,National Dong Hwa University
Journal of Physical Chemistry C | Year: 2014

Regarding how photogenerated charge carriers are transferred in TiO 2(B)/anatase mixed-phase nanowires, no unified conclusion has been reached. Electron paramagnetic resonance (EPR) spectroscopy is employed to investigate the vectorial charge transfer in this material. When the material is subjected to UV irradiation, we show that holes stimulated in anatase are transferred to TiO2(B) by comparing EPR-detected amounts of trapped hole O- accumulated on TiO2(B) with X-ray diffraction (XRD)-determined TiO2(B) bulk phase compositions. Under visible-light irradiation which only activates the TiO2(B) phase, we unambiguously show that electron transfer occurs from TiO2(B) to anatase. Without intervention of other charge carriers generated by bandgap excitation, we monitor exclusively the fate of conducting electrons generated by specific excitation of N- midgap states of TiO2(B) with holes localized on the N atom in N-doped TiO2(B)/anatase. The result again clearly demonstrates that electrons migrate from TiO2(B) to anatase. Time-dependent decay of the N•-hole EPR signal shows that it is difficult for the transferred electron to return to TiO2(B). Both higher conduction band and valence band edge potentials in TiO2(B) than the corresponding ones of anatase are implicated. This study helps to point the way toward future development of TiO2(B) nanowire based material for photovoltaic and photocatalytic applications. © 2014 American Chemical Society.

Hari Krishna M.,Vikrama Simhapuri University | Thriveni P.,Vikrama Simhapuri University
Der Pharma Chemica | Year: 2016

Cr(NO3)3. 9H2O is used as an efficient catalyst in the reaction of phenols with ethyl acetoacetate (via Pechmann reaction) in solvent-free media leads to the formation of coumarin derivatives using microwave irradiation in excellent yields with good purity.

Venkatadri N.,Vikrama Simhapuri University | Reddy K.R.,Vikrama Simhapuri University
Proceedings - 6th International Advanced Computing Conference, IACC 2016 | Year: 2016

Ad Hoc wireless network is a type of wirelessnetwork, in which there is no any fixed infrastructure. Devices in Ad Hoc network can move around thenetwork within a given range. Currently most of thetransactions are performed through the computernetworks so they are more susceptible to many physicalsecurity threats. One of the major DOS Attacks thatdegrade the performance of the whole MANET is BlackHole attack. In the presence of black hole attack, nastynodes are not forward the packets rather they droppackets. In this work, black hole attack is detected andeliminated through implementing Digital Signaturewith Twofish Algorithm. We modified on-demandrouting protocol Temporally Ordered RoutingAlgorithm (TORA) and named it as STORA. Ourproposed STORA performs well under normalconditions and under black hole attack than original TORA. © 2016 IEEE.

Syed S.,Vikrama Simhapuri University | Ussenaiah M.,Vikrama Simhapuri University
Proceedings of the 2015 International Conference on Green Computing and Internet of Things, ICGCIoT 2015 | Year: 2015

Data security is one of the biggest concerns in adopting Cloud computing. © 2015 IEEE.

Swetha C.,Sri Venkateswara University | Sainath S.B.,Vikrama Simhapuri University | Reddy P.S.,Sri Venkateswara University
Journal of Experimental Zoology Part A: Ecological Genetics and Physiology | Year: 2014

The objective of this study was to investigate the mode of action of dopamine in regulating hemolymph sugar level in the fresh water edible crab, Oziothelphusa senex senex. Injection of dopamine produced hyperglycemia in a dose-dependent manner in intact crabs but not in eyestalkless crabs. Administration of dopamine resulted in a significant decrease in total carbohydrates and glycogen levels with a significant increase in glycogen phosphorylase activity levels in hepatopancreas and muscle of intact crabs, indicating dopamine-induced glycogenolysis resulting in hyperglycemia. Bilateral eyestalk ablation resulted in significant increase in the total carbohydrates and glycogen levels with a significant decrease in the activity levels of phosphorylase in the hepatopancreas and muscle of the crabs. Eyestalk ablation resulted in significant decrease in hemolymph hyperglycemic hormone levels. The levels of hyperglycemic hormone in the hemolymph of dopamine injected crabs were significantly higher than in control crabs. However, no significant changes in the levels of hemolymph hyperglycemic hormone and sugar and tissue carbohydrate and phosphorylase activity were observed in dopamine injected eyestalk ablated crabs when compared with eyestalk ablated crabs. These results support an earlier hypothesis in crustaceans that dopamine acts as a neurotransmitter and induces hyperglycemia by triggering the release of hyperglycemic hormone in the crab, O. senex senex. © 2014 Wiley Periodicals, Inc.

Chalamcherla V.L.,Vikrama Simhapuri University | Singaracharya M.A.,Kakatiya University | Vijaya Lakshmi M.,A.N.U.
BioResources | Year: 2010

Defining and quantifying amino acid requirements will become an important consideration in the next generation of feeding schemes for dairy cattle beyond the current emphasis on identification of limiting amino acids. In this context different amino acid profiles of untreated, urea treated, fungal treated, and urea plus fungal treated lignocellulosic feed by both P. ostreatus wild and its two cellulase-minus/less lignolytic mutants were analyzed. Cellulase-free mutant strains were obtained after 20 minutes of exposure to UV light and 0.4 seconds to X-rays. A UV mutant of P. ostreatus (POM1) exhibited better performance than the X-ray mutant (POM2) in terms of production of less cellulolytic and more lignolytic enzymes. Urea treatment of straw enhanced the total amino acid content by less than a factor of two, while the fungal treatment improved it by 13-14 times. Fungal treatment of urea-treated straw improved the total amino acid content by a factor of 15, indicating the importance of urea in the straw. Further, the fungal treatment of ureatreated straw enhanced the quantity of amino acids such as glutamine, glycine, aspergine, etc. by 15-20 times. The quantity of limiting amino acids such as methionine, lysine, and histidine was also enhanced by 8 to 10 times through the fungal treatment. Maximum amounts of all the amino acids were found in urea plus fungal (POM1) treated paddy straw than in only fungal treated and only urea treated paddy straws.

Vijya C.,Vikrama Simhapuri University | Malikarjuna Reddy R.,Jawahar Bharati Degree and PG College
Indian Journal of Biotechnology | Year: 2012

The crop residues, such as, paddy straw, have low digestibility and, therefore, efforts have been made in the present study for microbial and enzymatic delignification of crude fiber to improve its nutritive value before feeding to animals. Two types of edible mushrooms were collected from the market and screened qualitatively for their ability to produce ligninases through guaiacol assay. The oyster mushroom showed maximum lignolytic activity and, thus, it was used in the study for the treatment of paddy straw. After sequencing of the mushroom culture used, it was identified as Schizophyllum commune. The cellulolytic activity and lignolytic activity of S. commune was assayed. The organism showed high cellulolytic as well as lignolytic activity at 25-30°C temperature and at neutral pH. As low cellulolytic and higher lignolytic activities are desirable for successful biodelignification of straw, different chemicals at various concentrations were used to suppress the cellulolytic activity. Of all the chemicals used, veratryl alcohol at 30 mM concentration was able to suppress the cellulolytic enzyme activity by 90%, while enhancing the lignolytic activity of the organism by 50-60%. Therefore, on the basis of present study, S. commune could be recommended for delignification of crop residues with the addition of appropriate quantity of veratryl alcohol.

Subashchandrabose S.R.,University of South Australia | Megharaj M.,University of South Australia | Venkateswarlu K.,Vikrama Simhapuri University | Naidu R.,University of South Australia
Environmental Toxicology and Chemistry | Year: 2012

The nontarget effects, in terms of biochemical changes induced by p-nitrophenol (PNP) in three soil microalgae, Chlorella sp., Chlorococcum sp., and Heterochlamydomonas sp., and the PNP removal efficiency of these isolates, were determined. On exposure to 20mgL-1 PNP, Chlorella sp. showed greater activity of peroxidase, superoxide dismutase, and glutathione reductase as well as high contents of proline and carotenoids. While Heterochlamydomonas sp. exhibited higher levels of catalase and protein, Chlorococcum sp. produced greater amounts of malondialdehyde, a measure of lipid peroxidation, in the presence of PNP. Chlorella sp. tolerated PNP by producing large quantities of antioxidants coupled with less lipid peroxidation, while Chlorococcum sp. was susceptible, as evidenced by low antioxidant production and high lipid peroxidation. During 7-d exposure, Chlorella sp., Heterochlamydomonas sp., and Chlorococcum sp. were able to remove 39, 18, and 4% of 20mgL-1 PNP, respectively. The present results indicate that proline, carotenoids and malondialdehyde are the potential biomarkers for assessing PNP toxicity toward microalgae, and their response could be considered for differentiating tolerant and susceptible strains. Moreover, there is a clear correlation between PNP removal and antioxidant synthesis in microalgae on exposure to the pollutant. © 2012 SETAC.

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