نتایج جستجو برای: sample preparation

تعداد نتایج: 568380  

2014
Sahar Ardabili

............................................................................................ 4 Populärvetenskaplig sammanfattning ......................... 5 List of publications ...................................................... 8 Contribution to the papers ................................................................ 9 Thesis Road Map ......................................................

Journal: :Analytical chemistry 2016
Kevin D Clark Cheng Zhang Jared L Anderson

Biological and pharmaceutical samples represent formidable challenges in sample preparation that hold important consequences for bioanalysis and genotoxic impurity quantification. This Feature will emphasize significant advances toward the development of rapid, sensitive, and selective sample preparation methods.

2014
B. K. Miller T. M. Barker P. A. Crozier

In situ studies of catalysts in the environmental transmission electron microscope (ETEM) are of great value to elucidate the structure of a catalyst under reaction conditions. This is important, since the structure of many catalysts change at elevated temperature in the presence of reactive gases [1-2]. One way to directly relate structure to activity is to measure the activity of the catalyst...

2013

As described above, successful MALDI sample preparation involves creating inti­ mate contact between the matrix (which may consist of a few different molecules) and the analyte. The experiment requires each of the matrix roles to be completed to obtain a usable mass spectrum. To demonstrate the importance of the matrix roles, Figures 6.7 and 6.8 show two examples where a specific role of the ma...

2013
Antonia Maria Carro-Diaz Rosa Antonia Lorenzo-Ferreira

The sample treatment/preparation steps involve any operation and manipulation of the samples prior to instrumental determination of the target compounds [1−3]. This is a critical step in the analytical process because the concentration of target analytes in the samples is frequently too low for quantification. Thus, the first step of the preparation protocol involves the exhaustive extraction/c...

Journal: :Applied optics 2014
Ronald R Willey

Measurement of antireflection coating of witness samples from across the worldwide industry has been shown to have excess variability from a sampling taken for the OSA Topical Meeting on Optical Interference Coatings: Measurement Problem. Various sample preparation techniques have been discussed with their limitations, and a preferred technique is recommended with its justification, calibration...

2002
Meredith S.S. Curren Jerry W. King

The term “food” refers to the broad range of edible materials that comprise the essential body nutrients required for life and growth, such as proteins, carbohydrates, fats, vitamins, or minerals. Foodstuffs are described variously as “lic&id” or “solid”, and “wet” or “dry”, depending on the amounts of water and fat they contain. Samples of plant origin are classified for analytical purposes as...

Hokmabadi, Rajabali , Kazemi, Meghdad , Rezaei Hachesu, Vida , shahtaheri, Seyed Jamaleddin ,

Introduction: Perpetration of samples is one of the most important stages needed for trace residue analysis of biological specimens when human exposure assessment is required. The samples preparation process makes the analyte get more purified and enriched as well as more compatible to the analysis instrument systems. The present study has concentrated on a systematic review of different articl...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده ادبیات و زبانهای خارجی 1393

the current study aimed at investigating the relationship between motivation and test preparation strategies (tpss) used by iranian pre-university students in their preparation period for the university entrance exam (uee). due to the importance of uee in iran, this study also attempted to show its impact on these two important variables. to this end, 100 pre-university students in an iranian p...

Journal: :JPMA. The Journal of the Pakistan Medical Association 2014
Ayse Sonay Kurt Serap Balci Dilek Kose

OBJECTIVE To assess test anxiety levels and related factors among students preparing for university exams. METHODS The descriptive, cross-sectional study was conducted at Istanbul University, Turkey, and comprised students preparing for exams in two private courses for the 2010-11 academic year. Data was collected via an original questionnaire and the Test Anxiety Inventory. SPSS 20 was used ...

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