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Iqbal S.,University of Malaya | Mat Kiah M.L.,University of Malaya | Dhaghighi B.,University of Malaya | Hussain M.,University of Malaya | And 5 more authors.
Journal of Network and Computer Applications | Year: 2016

Major provisioning of cloud computing is mainly delivered via Software as a Service, Platform as a Service and Infrastructure as a Service. However, these service delivery models are vulnerable to a range of security attacks, exploiting both cloud specific and existing web service vulnerabilities. Taxonomies are a useful tool for system designers as they provide a systematic way of understanding, identifying and addressing security risks. In this research work, Cloud based attacks and vulnerabilities are collected and classify with respect to their cloud models. We also present taxonomy of cloud security attacks and potential mitigation strategies with the aim of providing an in-depth understanding of security requirements in the cloud environment. We also highlight the importance of intrusion detection and prevention as a service. © 2016 Elsevier Ltd

Chen Y.,China University of GeosciencesWuhan | Yao J.,China University of GeosciencesWuhan | Chen K.,China University of GeosciencesWuhan | Wang F.,China University of GeosciencesWuhan | And 8 more authors.
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | Year: 2010

A multi-channel thermal activity microcalorimeter was used to determine the pyrene-induced toxic effect on two polycyclic aromatic hydrocarbon (PAH)-degrading bacteria Acinetobacter junii (A. junii) and Bacillus subtilis (B. subtilis). Power-time curves were analyzed and calorimetric parameters including growth rate constant (k), half inhibitory concentration (IC 50) and total thermal effect (QT) were obtained. A. junii and B. subtilis were completely inhibited when the concentration of pyrene reached 400 and 160 μg mL-1, respectively. The relationships between the calorimetric parameters and concentration of pyrene were studied. The growth rate of A. junii decreased with the increase in pyrene concentration at 50-200 μ g mL-1. The growth of biomass for A. junii at various concentrations of pyrene was determined. The count of A. junii after 8 day's incubation reached maximum irrespective of the initial pyrene concentrations ranging from 50 to 200 μg mL-1 and the smallest stimulative action of pyrene was at 200 μg mL-1. The variations of biomass during the growth of A. junii were consistent with the microcalorimetric data, indicating that microcalorimetry can be an effective technique to investigate the effect of pyrene on microorganisms. Copyright © Taylor & Francis Group, LLC.

PubMed | China University of GeosciencesWuhan, University of Tennessee at Knoxville and Wuhan University
Type: | Journal: Frontiers in microbiology | Year: 2016

Enhanced monsoon duration and soil acidification from acid rain are expected to impact the distribution of microbial communities in surface and subsurface environments, although these impacts are poorly understood for most systems. In central China, soluble carbonate bedrock forms extensive karst landscapes. Current predictions are that the amount of monsoonal precipitation and acid rainfall in central China will increase, which is expected to lead to changes in the pH balance of karst ecosystems. To evaluate the role of pH, total organic carbon, and other geochemical parameters (e.g., Ca

PubMed | China University of GeosciencesWuhan, Lawrence Berkeley National Laboratory, Wuhan University and University of Miami
Type: | Journal: Frontiers in microbiology | Year: 2016

Microbial communities can play important role in arsenic release in groundwater aquifers. To investigate the microbial communities in high arsenic groundwater aquifers in agricultural irrigation area, 17 groundwater samples with different arsenic concentrations were collected along the agricultural drainage channels of Hangjinhouqi County, Inner Mongolia and examined by illumina MiSeq sequencing approach targeting the V4 region of the 16S rRNA genes. Both principal component analysis and hierarchical clustering results indicated that these samples were divided into two groups (high and low arsenic groups) according to the variation of geochemical characteristics. Arsenic concentrations showed strongly positive correlations with [Formula: see text] and total organic carbon (TOC). Sequencing results revealed that a total of 329-2823 operational taxonomic units (OTUs) were observed at the 97% OTU level. Microbial richness and diversity of high arsenic groundwater samples along the drainage channels were lower than those of low arsenic groundwater samples but higher than those of high arsenic groundwaters from strongly reducing areas. The microbial community structure in groundwater along the drainage channels was different from those in strongly reducing arsenic-rich aquifers of Hetao Plain and other high arsenic groundwater aquifers including Bangladesh, West Bengal, and Vietnam.

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