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Displaying 526 - 550 of 1174

Determining carbapenemase activity with 18O labeling and targeted mass spectrometry

October 16, 2013
Author(s)
Meiyao Wang, Yang Shen, Illarion Turko, Daniel Nelson, Shuwei Li
Carbapenems are broad spectrum antibiotics considered as last resort drugs to treat bacterial infections. Carbapenem-hydrolyzing β-lactamases (also called carbapenemases), however, can confer bacterial resistance and represent a serious health threat. Here

Comprehensive analysis of protein digestion using six trypsins reveals the origin of trypsin as a significant source of variability in proteomics

October 11, 2013
Author(s)
Stephen E. Stein, Paul A. Rudnick, Scott J. Walmsley, Qian Dong, Alexey I. Nesvizhskii, Yuxue Liang
Trypsin is an endoprotease commonly used for sample preparation in proteomics experiments. Importantly, protein digestion is dependent on multiple factors, including the trypsin origin and digestion conditions. In-depth characterization of trypsin activity

Some Journal Metrics for Forensic Science International: Genetics

October 2, 2013
Author(s)
John M. Butler
Forensic Science International: Genetics, which is the official journal of the International Society for Forensic Genetics, has grown in readership and impact factor since its introduction in 2007. This article reviews some metrics of the 32 issues

Functionalization-Dependent Induction of Cellular Survival Pathways by CdSe Quantum Dots in Primary Normal Human Bronchial Epithelial Cells

September 5, 2013
Author(s)
Amber Nagy, Jennifer A. Hollingsworth, Bin Hu, Andrea Steinbruck, Peter C. Stark, Cristina Rios Valdez, Momchilo Vuyisich, Michael H. Stewart, Donald H. Atha, Bryant C. Nelson, Rashi Iyer
Quantum dots (QDs) are semiconductor nanocrystals exhibiting unique optical properties which can be exploited for many practical applications ranging from photovoltaics to biomedical imaging and drug delivery. They are increasingly manufactured in large

Measurement Uncertainty in Cell Image Segmentation Data Analysis

August 13, 2013
Author(s)
Jin Chu Wu, Michael W. Halter, Raghu N. Kacker, John T. Elliott, Anne L. Plant
Cell image segmentation is a part of quantitative studies regarding cell movement and cell behavior, and it plays a critical role in molecular biology and cellular biochemistry. Therefore, it is fundamentally important to evaluate the performance levels of

NIST Micronutrients Measurement Quality Assurance Program Summer 2007 Comparability Studies: Results for Round Robin LXII Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 27 Ascorbic Acid in Human Serum

August 5, 2013
Author(s)
David L. Duewer, Jeanice M. Brown Thomas
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes

NIST Micronutrients Measurement Quality Assurance Program Summer 2008 Comparability Studies: Results for Round Robin LXIV Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 29 Ascorbic Acid in Human Serum

August 5, 2013
Author(s)
David L. Duewer, Jeanice M. Brown Thomas
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes

NIST Micronutrients Measurement Quality Assurance Program Summer 2009 Comparability Studies: Results for Round Robin LXVI Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 31 Ascorbic Acid in Human Serum

August 5, 2013
Author(s)
David L. Duewer, Jeanice M. Brown Thomas
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes

NIST Micronutrients Measurement Quality Assurance Program Winter 2007 Comparability Studies: Results for Round Robin LXI Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 26 Ascorbic Acid in Human Serum

August 5, 2013
Author(s)
David L. Duewer, Jeanice M. Brown Thomas
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes

NIST Micronutrients Measurement Quality Assurance Program Winter 2008 Comparability Studies: Results for Round Robin LXIII Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 28 Ascorbic Acid in Human Serum

August 5, 2013
Author(s)
David L. Duewer, Jeanice M. Brown Thomas
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes

NIST Micronutrients Measurement Quality Assurance Program Winter 2009 Comparability Studies: Results for Round Robin LXV Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 30 Ascorbic Acid in Human Serum

August 5, 2013
Author(s)
David L. Duewer, Jeanice M. Brown Thomas
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes

NIST Micronutrients Measurement Quality Assurance Program Summer 2010 Comparability Studies: Results for Round Robin LXVIII Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 33 Ascorbic Acid in Human Serum

August 2, 2013
Author(s)
David L. Duewer, Jeanice M. Brown Thomas
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes

NIST Micronutrients Measurement Quality Assurance Program Winter 2010 Comparability Studies: Results for Round Robin LXVII Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 32 Ascorbic Acid in Human Serum

August 2, 2013
Author(s)
David L. Duewer, Jeanice M. Brown Thomas
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes

Identification and Quantification of DNA Repair Protein Apurinic/Apyrimidinic Endonuclease 1 (APE1) in Human Cells by Liquid Chromatography/Isotope-Dilution Tandem Mass Spectrometry

July 29, 2013
Author(s)
Guldal Kirkali, Pawel Jaruga, Prasad T. Reddy, Alessandro Tona, Li Mengxia, David M. Wison III, M Miral Dizdar, Bryant C. Nelson
Unless repaired, DNA damage can drive mutagenesis or cell death. DNA repair proteins may therefore be used as biomarkers in disease detection or therapeutic response estimation. Thus, the accurate measurement of DNA repair protein expression is of

Challenges of the Changing Robot Markets

July 19, 2013
Author(s)
Gurvinder S. Virk, Carol Herman, Roger V. Bostelman, Tamas Haidegger
Service robots are becoming an integrated part of daily life, entering even the most complex scenarios, yet at a slower pace than previously anticipated. This paper presents an overview of the changing area of robotics and the new challenges being faced

Capturing Rare Cells From Blood Using a Packed Bed of Custom-Synthesized Chitosan Microparticles

July 1, 2013
Author(s)
Chandamany Arya, Jason Kralj, Kunqiang Jiang, Matt S. Munson, Thomas Forbes, Don L. DeVoe, Srinivasa R. Raghavan, Samuel Forry
Uniform multifunctional chitosan microparticles were produced in large numbers using a simple and inexpensive microtubing arrangement. The particles were functionalized through both physical encapsulation of carbon black, to attenuate autofluorescence, and

Standard Reference Materials for Medical CT

June 27, 2013
Author(s)
Zachary H. Levine, Huaiyu H. Chen-Mayer, Adam L. Pintar, Daniel S. Sawyer
NIST Standard Reference Materials 2087 and 2088 for medical computed tomography (CT) have become available. The materials allow CT reconstructions to be tied to the International System of Units in length, density, and mass attenuation coefficient.
Displaying 526 - 550 of 1174