ENHANCEMENT FOR DATA SECURITY IN CLOUD COMPUTING ENVIRONMENT

Cloud computing, a rapidly developing information technology, has aroused the concern of the whole world. Cloud computing is Internet-based computing, whereby shared resources, software and information, are provided to computers and devices on-demand, like the electricity grid. Cloud computing is the product of the fusion of traditional computing technology and network technology like grid computing, distributed computing parallel computing and so on. It aims to construct a perfect system with powerful computing capability through a large number of relatively low-cost computing entity, and using the advanced business model like SaaS (Software as a Service) to distribute the powerful computing capacity to end users’ hands. To address this longstanding limitation by building a multi-tenant system. Our system provides the environment for the user to perform his tasks, but with very high security. By using further facilities provided in this system user fill secure about his data and his account

Effect of Er:YAG laser enamel conditioning and moisture on the microleakage of a hydrophilic sealant

For a given sealant, successful pit and fissure sealing is principally governed by the enamel conditioning technique and the presence of moisture contamination. A new generation of hydrophilic resin sealants is reported to tolerate moisture. This study investigates the impact of Er:YAG laser pre-conditioning and moisture contamination on the microleakage of a recent hydrophilic sealant. Occlusal surfaces of extracted human molars were either acid etched (n = 30), or successively lased and acid etched (n = 30). Ten teeth from each group were either air-dried, water-contaminated, or saliva-contaminated prior to sealing with UltraSeal XT® hydro™. Samples were inspected for penetration of fuchsin dye following 3000 thermocycles between 5 and 50 °C, and the enamel–sealant interfaces were observed by scanning electron microscopy (SEM). Significant differences in microleakage were evaluated using the Mann–Whitney U test with Bonferroni adjustment (p = 0.05). Laser pre-conditioning significantly reduced dye penetration irrespective of whether the enamel surface was moist or dry. Microleakageof water-contaminated acid etched teeth was significantly greater than that of their air-dried or saliva-contaminated counterparts. SEM analysis demonstrated good adaptation in all groups with the exception of water-contaminated acid etched teeth which exhibited relatively wide gaps. In conclusion, this hydrophilic sealant tolerates the presence of saliva, although water was found to impair its sealing ability. Laser pre-conditioning significantly decreases microleakage in all cases

Mass spectral study of isomeric benzoxazolinones by electron ionisation

The electron impact mass spectra of isomeric dihydrofurobenzoxazolinones, (1–3), hydroxy (2-methyl-2-propenyl)benzoxazolinones (4–5) and (2-methyl-2- propenyloxy)benzoxazolinones (6–7) are studied. The mass spectra of 1–3 show differences in the relative abundance of an ion at m/z 163. A mechanism involving the heteroatom of the benzoxazolinone ring which is para to the oxygen of the dihydrofuran ring has been proposed to explain the results. The mass spectra and collision-induced dissociation spectra of molecular ions of 4 and 5 are similar to those of 1 and 2, respectively, suggesting the rearrangement of 4 and 5 to 1 and 2, respectively, in the source of the mass spectrometer. The fragmentation of 6 and 7 supports the proposition of dihydrofuran ring opening in 1–3. The fragmentation of 6 and 7 is different in comparison to 4 and 5, suggesting that 6 and 7 do not rearrange to 4and 5, respectively, either before or after ionisation

Colaba–Alibag magnetic observatory and Nanabhoy Moos: the influence of one over the other

The first permanent magnetic observatories in colonial India were established by the East India Company and under the Göttingen Magnetic Union. One of the world's longest running observatories was set up at Colaba (Bombay) in 1841, which was shifted to Alibag in 1904 to avoid electric traction effects on magnetic recordings. The observatory is located at the northwestern tip of Maharashtra, India, on the Arabian Sea. The magnetic data at Colaba were collected through eye-observation instruments from 1841 to 1872 and by photographic (magnetograph) instruments from 1872 to 1905, which reveal seasonal and other periodic effects on geomagnetic elements. Seasonal influence can be deciphered on the H minimum, but not on the maximum; the disturbances in March and April were opposite to those in December and January. D was maximum in 1880 (57' E) and minimum in 1904 (10' E). The data from 1882 to 1905 revealed that H annual inequality was influenced by 5.5-year periodicity, D by 13.5 days from 1888 to 1905, and I and Z by 11-year periodicity from 1894 to 1905 and 1873 to 1905, respectively. Secular variation of Z was parallel to that of I. Z exhibited an increasing trend from 1868 (12 874 nT) to 1905 (15 083 nT). The plan and location of Colaba–Alibag as well as the instruments used are discussed. The initial Colaba magnetic data containing "magnetic disturbances" was harnessed to identify the "disturbing point" on Earth. Nanabhoy Moos, the first Indian director, presciently hinted at a solar origin for magnetic disturbances, revealed the dependence of magnetic elements on the sunspot cycle, unraveled disturbance daily variation, and tried to understand the association, if any, between geomagnetic, seismological and meteorological phenomena. The two giant volumes published in 1910 attest to Moos' seminal work and his inventiveness in organizing and analyzing long series data. He also had a major role in moving Colaba magnetic observatory to Alibag. Thus, the observatory and Moos had a synergestic relationship influencing each other. The long data series has as much historical significance as scientific, which can bring out short- as well as long-term trends in geomagnetic data

Therapeutic Effect of Saponin Rich Fraction of Achyranthes aspera Linn. on Adjuvant-Induced Arthritis in Sprague-Dawley Rats

Objective. Achyranthes aspera Linn. (AA) is used in folklore for the treatment of various inflammatory ailments and arthritis like conditions. Anti-inflammatory activity of saponin rich (SR) fraction of AA has been previously reported. The objective of this study was to assess the antiarthritic effect of SR fraction of Achyranthes aspera in adjuvant-induced arthritic rats. Methods. Arthritis was assessed by arthritis score, paw volume, changes in tibiotarsal joint thickness, hyperalgesic parameters, and spleen and thymus index. Haematological, serum, biochemical, and inflammatory cytokine and in vivo antioxidant parameters were measured on the last day of the study. Results. SR fraction significantly suppressed paw swelling and arthritic score and improved the pain threshold in motility and stair climbing tests. There was a reversal in the levels of altered parameters, alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, and antioxidant parameters like superoxide dismutase, catalase, glutathione, malondialdehyde, and nitric oxide. SR fraction significantly decreased plasma levels of tumor necrosis factor-alpha and interleukin-6. Moreover, histopathology revealed a significant reduction in synovial hyperplasia, inflammatory cell infiltration, and bone destruction in the joints. Conclusion. These observations explain the therapeutic benefit of SR fraction of AA in suppressing the progression of adjuvant-induced arthritis in rats

DNA damage in lens epithelial cells of senile cataract patients of different Prakriti according to Ayurveda literature.

Background: Ageing is a unidirectional phenomenon of life and a key initiator for several age-related disorders, out of that Senile cataracts are one of them. Several mechanisms have been linked with the pathogenesis of senile cataracts. Lens opacities may appear due to anatomical architecture changes caused by oxidative stress, mutations, or physical changes. The Indian traditional system of Ayurveda describes Prakriti (The ayurvedic concept of a constitution). The Ayurvedic concept of the constitution is useful in predicting an individual's susceptibility to age-related diseases like Cataracts (Kaphaja Linganasha). Objectives: To assess DNA damage directly in human lens epithelial cells (HLEC) of senile cataracts of Vata Predominant, Pitta Predominant & Kapha Predominant Prakriti individuals.  Patients and methods: After obtaining Institutional Ethics Committee permission, HLEC were taken from 20 Vatta Predominant,20 Pitta Predominant & 20 Kapha Predominant Prakriti individuals of cataract after cataract surgery and from 4 controls in which Quantitative assessment of DNA damage was measured using CometScore ™ software. The formation of “comets” in the DNA of lens epithelial cells can be visualized through the method of single gel electrophoresis and indicates DNA strand breaks, as the damaged DNA migrates at a different rate than non-damaged DNA during electrophoresis  Results:  No such prominent comets were indicating any DNA damage in the HLEC of the four control subjects, but comets were found in cataractous HLEC.  The maximal damage was found in pitta-predominant Prakriti Individuals. In senile cataract patients, in HLECs DNA was randomly damaged and this type of damage was possible by reactive oxygen species (ROS). The DNA damage in HLEC was found maximally in pitta Predominant Prakriti individuals of senile type of cataract patients. Statistical significance was observed between senile cataracts in pitta predominant Prakriti vs. senile cataracts in Vata predominant Prakriti individuals & between senile cataracts in Vata predominant Prakriti vs. senile cataracts in Kapha Prakriti individual. No statistically significant results were obtained for senile cataracts in pitta Prakriti vs. senile cataracts in Kapha Prakriti individuals. Conclusion: The pathogenesis of senile cataracts is multifactorial and includes continuous molecular stress brought by photo-oxidative stress, UV irradiation, and oxidative reactions