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15 Current white paper about the topic determination

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GC-C-IRMS Determination of Hormones

eVol® Reduces Interference Caused by Solvents and Plastic Pipette Tips

26-09-2011

#img10984# The Belgian Federal Agency for the Safety of the Food Chain (FASFC) is a federal executive agency that sets the operational standards applicable to businesses and integrates all official control and inspection services for the food chain. The FASFC is responsible for setting, ...

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Field-Flow Fractionation - The Universal Separation Principle for Particle and Macromolecule Characterization

22-09-2010

High molecular weight polymers, bio molecules or particles in a range of a few nanometers up to several microns are more and more important in science and technology. Many applications are based on the specific properties of these materials. For this reason, an exact knowledge of the molar ...

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Size and element specific determination of Ag nanoparticles in consumer spray products using asymmetric flow field flow fractionation (AF4) coupled to ICPMS

10-09-2010

#img6125# Introduction: The use of nanoparticles in consumer products shows a tremendous increase over the past years. A study of the Woodrow Wilson International Centre for Scholars¹ reported that between 2005 and today the number of products based on nanoparticles increased almost ...

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Automated Dynamic Light Scattering

09-11-2009

INTRODUCTION From the late 1980s commercial Dynamic Light Scattering (DLS) detectors started being used in commercial biophysical laboratories throughout the world. These instruments enabled size measurements of small volumes of proteins and other biomaterials in solution to be made, with ...

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ORAC Assay Performed on the POLARstar Omega and PHERAstar FS microplate reader

15-09-2009

Antioxidants are able to neutralize Reactive Oxygen Species Antioxidant capacity of fruit juices determined with the ORAC assay in 96 and 384-well format MARS data analysis software with predefined templates for quick ORAC evaluation Introduction In all oxygen consuming cells, metabolism ...

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Improvement of power generation efficiency of solar cells and evaluation by fluorescence spectroscopy

24-08-2009

The light in the high-radiance wavelength region of the solar spectrum is not utilized effectively by silicon crystal-based solar cell modules. "Fluorescent materials" convert the ultraviolet component in the sunlight into light in the longer wavelength region where this solar cell modules ...

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Polyolefins: Determination of Molecular Weight and Branching Structure by GPC/SEC

16-06-2008

Polyethylene and Polypropylene are so-called Polyolefins. They are produced in large amounts every year. Depending on the process and catalyst used linear or branched polymers can be produced. In case of e. g. Polyethylene there are at least three polymer types: HDPE (High Density ...

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Chemometric Spectroscopy

Modular Software for Routine Analysis

26-02-2007

Introduction Chemometric Spectroscopy is the term used to describe the direct combination of a spectroscopic measurement with a chemometric data evaluation procedure, typically a multivariate statistic method [1, 2], so providing quick and reliable deduction of the qualitative and ...

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Measurement of Nano particles and Proteins

08-11-2006

Colloid emulsions in their native environment require particle size determination in high concentration since there are concerns about changes in sample morphology upon dilution eg break up of aggregates. For proteins and other samples with very low concentration and for weakly scattering ...

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"Triple Detection" in Gel Permeation Chromatography

11-11-2005

Gel permeation chromatography (GPC) or also named size exclusion chromatography (SEC) is the most often used method for determining the molecular weight of natural and synthetic macromolecules. One specific strength of this method lies in the fact that by the separation process the whole ...

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