Wednesday, May 6, 2020

Sample Reproduction Methods For Non-Target Screening

Non-target screening aims to obtain an overview of the sample constituents and identifies all the eligible peaks in the sample. The soil samples contaminated by electroplating wastewater usually contain a large amount of organic pollutants with high matrix interferences (Zhao 2013). In order to choose an effective sample extraction method, three commonly used extraction methods including accelerated solvent extraction (ASE), Soxhlet extraction, and microwave-assisted extraction (MAE) (Wang 2007, Rodriguez-Solana 2015, and Jurado-Sanchez 2013) have been compared based on the previous reports. Among these methods, ASE provides the best extraction efficiency for extracting most semi-volatile organic compounds in soil samples with short†¦show more content†¦Stock solutions were prepared in isooctane, and then diluted into seven concentration levels, from 1 to 500  µg/L. The stock solution was kept at -18  °C until use. The internal standard solution with a concentration of 100 ÃŽ ¼g/L was diluted from an Internal Standard Mix purchased from AccuStandard (New Haven, Connecticut, USA) and used to determine the concentration of target compounds by calculating the response factor, noting that the selected internal standards were stable and similar to the analytes and would not interfere with the sample components. The surrogate standard solution was prepared at 10 mg/L for nitrobenzene-d5 and p-terphenyl-d14 for performing the quality control function, since its recovery rate was used to evaluate the efficiency of the analytical method. The organic solvents, of analytical grade, were purchased from JK scientific LTD (Beijing, China). Sample information and Sample Preparation In this study, three soil samples were chosen for the analysis and explanation of the whole workflow. Two soil samples were collected from a leaching basin (Boxing, Shandong Province, China), surrounded by two small electroplating factories and polluted by electroplating wastewater. Sample #1 and Sample #2 were taken from the top layer soil (0–20 cm) and middle layer soil (20–50 cm) of the leaching basin bottom using a soilShow MoreRelatedNon Clinical Studies : The Discovery Of A New Drug Without Involving Human Subjects1798 Words   |  8 PagesNon clinical Studies for Biologic The discovery of a new drug without involving human subjects is called as non clinical studies. Goals of non-clinical testing of Biologics are: characterization of probable undesirable drug effects, identifying toxicities on organs, identifying convertibility of toxicity , characterization of pharmacokinetic report, characterization of favorable pharmacodynamicRead MoreThe Discovery Of New Drug Without Involving Human Subjects1782 Words   |  8 PagesNon clinical Studies The discovery of new drug without involving human subjects is called as non clinical studies. Goals of non-clinical testing of Biologics are: characterization of potential adverse drug effects, identify end organ toxicities, identify reversibility of toxicity , characterization of pharmacokinetic profile, characterization of beneficial pharmacodynamic effects -proofRead MoreCancer Is A Common Type Of Invasive Breast Cancer2160 Words   |  9 Pagesanywhere in the body due to rapid formation of abnormal cell growth. Normal cells develop into abnormal cells when there is damage to the DNA. Hyperactive reproduction of abnormal cells or cancer cells will develop into lumps that may either be benign or malignant. Benign masses are non-cancerous and usually remain in the same area from which they formed in the body. Malignant masses on the other hand are cancerous and tend to spreadRead MoreThe Fluidity Of Cloning : Gender Norms Racial Bias3913 Words   |  16 Pagesor software. Molecular cloning Molecular cloning refers to the process of making multiple molecules. Cloning is commonly used to amplify DNA fragments containing whole genes, but it can also be used to amplify any DNA sequence such as promoters, non-coding sequences and randomly fragmented DNA. It is used in a wide array of biological experiments and practical applications ranging from genetic fingerprinting to large scale protein production. Occasionally, the term cloning is misleadingly usedRead MoreThe Spread And Continued Reproduction Of The Northern Snakehead1922 Words   |  8 PagesThe Problem Domain The spread and continued reproduction of the Northern Snakehead in the Potomac river has been and will continue to be a threat to the integrity of the local ecosystem. The Northern Snakehead is causing a disturbance in the local ecosystem. These fish need to either be removed from the ecosystem or their spread halted. Since their discovery in Crofton, Maryland, drastic measures have been taken in the past to rapidly eradicate this species regardless of lasting effects. Most ofRead MoreMaking Sence of Homonegativity10662 Words   |  43 Pages1080/14780887.2011.586098 PLEASE SCROLL DOWN FOR ARTICLE Full terms and conditions of use: This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be completeRead MoreGlobal Marketing Summary Chapter 5-106416 Words   |  26 PagesInfringement of Intellectual Property †¢ Counterfeiting—unauthorized copying and production of a product †¢ Associative counterfeit/imitation—product name differs slightly from a well-known brand †¢ Piracy—unauthorized publication or reproduction of copyrighted work †¢ Intellectual Property Protecting Intellectual Property †¢ In the United States, registration is with the Federal Patent Office †¢ In Europe, applicants use the European Patent Office or register countryRead More History of Acquired Immune Deficiency Syndrome Essay5178 Words   |  21 Pageschemokine receptor, CCR5, bound HIV strains that dominate in the early stages of the disease. Researchers are continuously discovering more chemokine receptors. Any human cell that has the correct binding molecules on its surface is a potential target for HIV infection. However, it is the specific class of human white blood cells called CD4 T-cells that are most affected by HIV because these cells have high concentrations of the CD4 molecule on their outer surfaces. HIV replication in CD4 T-cellsRead MoreDevelopment Of The Mammary Gland9524 Words   |  39 Pagessecond leading cause of cancer-related deaths among women around the world with more than reported 500,000 deaths per year. Breast cancer deaths have decreased by 42 percent since the peak in 1986 due to earlier detection through regular mammography screening. However, one in 29 Canadian women will die from breast cancer. These statistics remain unchanged over the past year. 2.2 Cause of breast cancer Breast cancer is always caused by a genetic abnormality. However, only 5-10% of cancers are due toRead MoreRelationship Between Culture and the Clinical Practice of Psychological Assessment8526 Words   |  35 Pagesvisited schools in the rural areas not too far from the city where we lived. The purpose of the visit was to see whether the teachers wanted to be trained to use a developmental screening test so that the results could be used to help them tailor their instruction to the needs of their learners. We had the notion that the almost non-existent pre-school facilities in rural areas together with impoverished living and economic conditions would impact negatively on childrens development. Our preconceived

No comments:

Post a Comment

Note: Only a member of this blog may post a comment.