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Acai Fruit as a Source of Bioactive Phytochemicals

Journal of Life Sciences 2016年第8期10卷 391-404页

作者： Randah M. alqurashi Daniel M. Commane Ian R. Rowland Hugh Sinclair Unit. of Human Nutrition Department of Food and Nutritional Sciences University of Reading Reading RG6 6AP United Kingdom The Saudi Arabian Ministry of Education Kingdom of Saudi Arabia

The fruit of the acai palm （Euterpe oleracea Mart.） is a rich source of potential bioactive phytochemicals, however neither its precise composition nor the putative benefits to health from its consumption have been fully characterised. This study aims to elucidate the composition of acai fruit pulp and to explore the potential of these extracts to confer protection in a cell culture based model of oxidative DNA damage. Extractions ofcai pulps were dissolved in a 80% methanol （methanol： water, 80：20 v/v） based solvent and the phytochemicals present in the extract were analysing by HPLC detector. Lipids were assessed via GC. The Folin-Ciocalteau assay was used to determine the purposes of providing a phytochemical rich food based comparator with established health benefits. Finally, protection against oxidative DNA damage was assessed in HT-29 cell lines exposed to hydrogen peroxide via the comet assay. Acai pulp extracts were found to be rich in flavonoids, anthocyanins and carotenoids. These extracts were found to protect against oxidative DNA damage （anti-genotoxicity）. A^ai extracts were more effective at preventing oxidative DNA damage than the blueberry extracts, although their antioxidant capacities as assessed by the FRAP assay were similar. These data shown that acai is a rich source of plant phytochemicals and that these chemicals may protect against oxidative stress in human colon cells （HT-29）. Further work.is needed to establish the digestive fate of these phytochemicals and to prove the beneficial effects in human.

关键词： Acai pulp antioxidant activity anti-genotoxicity polyphenols.

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Stochastic modelling and estimation of inertial sensors

Stochastic modelling and estimation of inertial sensors

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第五届中国卫星导航学术年会

作者： Youlong Wu Jinling Wang Xiaoming Wang Muwaffaq alqurashi School of Mechanical Engineering Nanjing University of Science and Technology School of Civil and Environmental Engineering University of New South Wales

The Global Navigation Satellite System（GNSS） and Inertial Navigation System（INS） are two main navigation systems with complementary *** some GNSS challenged environments,due to signal jamming or block.ge,INS becomes stand-alone navigation *** is a dead reck.ning based system,and its performance will gradually degrade with *** performance degradation is mainly caused by the deterministic errors and stochastic errors according to their ***,precise modelling inertial sensors are the first and the most important step for the inertial navigation *** errors are due to manufacturing and mounting defects and can be calibrated out from the raw *** the other hand,stochastic errors are the random errors which cannot be removed from the measurements and should be modelled as ***,the better identification of the stochastic errors is critical for *** work.on analysing and modelling inertial sensors is based on the computing the Allan variance of inertial sensors output and using least squares fitting or reading results from the Allan variance log-log plot *** paper presents a methodology for estimating the stochastic errors using segmented weighted ***,individual noise is simulated and the noise spectraldensity can be obtained through the least square to validate each noise ***,thesimulation studies with the combination of different noise types are carried out to compare withthe traditional *** proposed algorithm demonstrates remark.ble improvement,especially in estimate the long-term errors compared with the traditional *** testresults also confirm the effectiveness of the new method.

关键词： Allan variance·stochastic modelling·inertial sensors

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Study of the Security Enhancements in Various E-Mail Systems

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Journal of Information Security 2015年第1期6卷 1-11页

作者： Afnan S. Babrahem Eman T. Alharbi Aisha M. Alshik. Saja S. alqurashi Jayaprak.sh k.r Department of Information Technology Faculty of Computing and Information Technology King Abdulaziz University Jeddah KSA Department of Information Systems Information Security Research Group Faculty of Computing and Information Technology King Abdulaziz University Jeddah KSA

E-mail security becomes critical issue to research community in the field of information security. Several solutions and standards have been fashioned according to the recent security requirements in order to enhance the e-mail security. Some of the existing enhancements focus on k.eping the exchange of data via e-mail in confident and integral way. While the others focus on authenticating the sender and prove that he will not repudiate from his message. This paper will survey various e-mail security solutions. We introduce different models and techniques used to solve and enhance the security of e-mail systems and evaluate each one from the view point of security.

关键词： E-Mail Security Enhancement Malware Attack. Authentication Integrity

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