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53 articles for “mass spectrometry”
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Research ArticleOpen accessIn the abstractGC-MS Analysis and PLS-DA Validation of the Trimethyl Silyl-Derivatization TechniquesKamalrul Azlan Azizan, Syarul Nataqain Baharum, Habtom W. Ressom, Normah Mohd. NoorProblem statement: Comparison and validation analysis of the conventional and power-adjusted Microwave-Assisted (MA) techniques of TMS derivatization using Gas Chromatography-Mass Spectrometry (GC-MS) and Multivariate Analysis (MVA) of Partial Least Squares Analysis (PLS-DA). Further improvement of the conventional technique using vigorous shaking was tested and analyzed. Approach: Cross-validation and response permutation test of PLS-DA and S-plot of Orthogonal Partial Least Squares … …American Journal of Applied Sciences, Vol. 9, Issue 7 · 4 Jun 2012 · 10,325 accessesView PDFCite
Research ArticleOpen accessIn the abstractUsing Orthosiphon stamineus B. for Phytoremediation of Heavy Metals in Soils Amended with Sewage SludgeArifin Abdu, Najihah Aderis, Hazandy Abdul-Hamid et al.Problem statement: Phytoremediation is a biological treatment where plants are used to remove pollutants from the environment to make them harmless. A study was conducted in a greenhouse at the Faculty of Forestry, Universiti Putra Malaysia on the potential of Orthosiphon stamineus B. planted in sewage sludge for heavy metals uptake. The objective of this study was to evaluate the … …American Journal of Applied Sciences, Vol. 8, Issue 4 · 18 Apr 2011 · 8,773 accessesView PDFCite
Research ArticleOpen accessIn the abstractRare Earth Elements and Geochemical Partitioning of Zn and Pb in Sediments of an Urban RiverShaila Sharmin, H. M. Zakir, Naotatsu ShikazonoProblem statement: Urban river sediment pollution due to Zn and Pb is a serious problem in all over the world. The source and level of Zn and Pb pollution in sediments of Nomi River of Ota Ward, one of the most industrialized areas in Tokyo, Japan is still lacking. Approach: The present study focused on Rare Earth Elements (REEs) and … …American Journal of Environmental Sciences, Vol. 6, Issue 5 · 31 Oct 2010 · 6,969 accessesView PDFCite
Research ArticleOpen accessIn the abstractExpression, Purification and Activity Assay of the Recombinant Protein of Catechol-O-Methyltransferase from Chinese White Shrimp (Fenneropenaeus chinensis)Dian-Xiang Li, Xin-Jun Du, Xiao-Fan Zhao, Jin-Xing WangProblem statement: We have previously cloned a gene of Chinese white shrimp Catechol O-Methyltransferase (designated Fc-COMT) and characterized the gene expression pattern. In this study, expression and purification as well as activity assay of the recombinant Fc-COMT was further conducted. Approach: Using pET-30a (+) as a prokaryotic expression vector, the recombinant Fc- COMT was expressed in the supernatant of Escherichia … …American Journal of Biochemistry and Biotechnology, Vol. 6, Issue 3 · 30 Sep 2010 · 7,774 accessesView PDFCite
Research ArticleOpen accessIn the abstractA Proteomics Analysis of Drought Stress-Responsive Proteins as Biomarker for Drought-Tolerant Sugarcane CultivarsNisachon Jangpromma, Supansa Kitthaisong, Khomsorn Lomthaisong et al.Problem statement: The prime objective in breeding selection process of drought-tolerant sugarcane is to identify the correlating marker, which could lead to rapid screening for drought-tolerant cultivars. In this study, we have reported an unknown 18-kDa protein (p18) along with other stress-inducible proteins to be highly expressed in sugarcane leaves under drought stress condition. Approach: The 2D-PAGE patterns of proteins … …American Journal of Biochemistry and Biotechnology, Vol. 6, Issue 2 · 30 Jun 2010 · 9,819 accessesView PDFCite
Research ArticleOpen accessIn the abstractConcentration of Zn, Cu and Pb in Some Selected Marine Fishes of the Pahang Coastal Waters, MalaysiaB. Y. Kamaruzzaman, M. C. Ong, S. Z. RinaProblem statement: Heavy metals constitute one of the most hazardous substances that could be accumulated in biota. Fish populations exploited by man often live in coastal area environments that contain high levels of heavy metals, coming from human activities such as industrial and agricultural wastes. A problem to deal when using fishes as biomonitors of heavy metals is the relationship … …American Journal of Applied Sciences, Vol. 7, Issue 3 · 31 Mar 2010 · 10,011 accessesView PDFCite
Research ArticleOpen accessIn the abstractArsenic and Antimony Content in Soil and Plants from Baia Mare Area, RomaniaGabriela Oprea, Angela Michnea, Cristina Mihali et al.Problem statement: The objective of this research was to evaluate the degree of soil contamination with arsenic and antimony in Baia Mare, a nonferrous mining and metallurgical center located in the North West region of Romania. The soil in the area is affected by the emissions of powders containing metals from metallurgical factories. Previous studies indicated the soil contamination with … …American Journal of Environmental Sciences, Vol. 6, Issue 1 · 28 Feb 2010 · 7,778 accessesView PDFCite
Research ArticleOpen accessIn the abstractGeochemical Distribution of Trace Metals and Assessment of Anthropogenic Pollution in Sediments of Old Nakagawa River, Tokyo, JapanH.M. Zakir, Naotatsu Shikazono, Kazuo OtomoThe geochemical distributions of cadmium (Cd), copper (Cu), chromium (Cr), lead (Pb) and zinc (Zn) were examined in sediments collected from Old Nakagawa River (NR), Tokyo, Japan. A widely used 5-step sequential extraction procedure was employed for the fractionation of the metals and the concentrations were measured in the liquid extracts by inductively coupled plasma mass spectrometry (ICP-MS). The association … …American Journal of Environmental Sciences, Vol. 4, Issue 6 · 31 Dec 2008 · 7,455 accessesView PDFCite
Research ArticleOpen accessIn the abstractDistillation and Microdiffusion Modifications for total Nh4f Quantification and 15N RecoveryGaius D. Eudoxie, Gregory A. GouveiaProblem statement: Applying 15N techniques to accurately determine the fate of fixed ammonium (NH4f) in the strongly and weakly held pools require modifications to existing methodologies. Modifications are necessary for measurement of total NH4f in soils by direct digestion with 5 M HF: 1 M HCl, excluding alkali pretreatment, followed by distillation and quantification of NH4. Quantification by distillation was … …American Journal of Agricultural and Biological Sciences, Vol. 3, Issue 4 · 31 Dec 2008 · 7,593 accessesView PDFCite
Research ArticleOpen accessIn the abstractA screen for Benzo(a)pyrene in Fish Samples From Crude Oil Polluted EnvironmentsChimezie Anyakora, Mohsen Arbabi, Herbert CokerSeveral studies have shown that exposure to Benzo(a)pyrene increases the risk of cancer. In this study several fish samples from Niger the Delta region of Nigeria were screened for the presence of Benzo(a)pyrene. The study was carried out using Gas chromatograph coupled to a mass spectrometry detector. Benzo(a)pyrenes in the samples were identified through both retention time match with authentic … …American Journal of Environmental Sciences, Vol. 4, Issue 2 · 30 Apr 2008 · 6,772 accessesView PDFCite