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Displaying 176 - 200 of 802

Biofilm Over Teeth and Restorations, What Do We Need to Know?

March 31, 2017
Author(s)
Nancy J. Lin
Objectives The goal of this paper is to provide an overview of biofilms and biofilm measurements in the context of studying biofilms on tooth and dental material surfaces to improve oral health. Methods A historical perspective and terminology is presented

Life Time Dosimetric Assessment for Mice and Rats Exposed to Cell Phone Radiation in Reverberation Chambers

March 17, 2017
Author(s)
Perry F. Wilson, John M. Ladbury, Galen H. Koepke, Yijian Gong, Myles Capstick, Keven Kuhn, David L. McCormick, Ronald L. Melnick, Niels Kuster
In this paper, we present a detailed life time dosimetry analysis for individually housed rodents exposed to radio frequency (RF) signals. The unrestrained rodents were exposed in reverberation chambers for 2 years at three whole-body averaged specific

Neuroelectronic Device Process Development and Challenge

March 16, 2017
Author(s)
Jessie Zhang, Gymama Slaughter, Matthew Robinson, Joel Tyson
One of the major challenges of brain activity monitoring is to obtain high quality signals from the brain using metal electrodes. The probes consisting of metal electrodes have to be thin enough without damaging the tissue while maintaining good contact to

NIST Micronutrients Measurement Quality Assurance Program Winter and Summer 2016 Comparability Studies: Results for Round Robin LXXIX and LXXX Fat-Soluble Vitamins and Carotenoids in Human Serum

March 16, 2017
Author(s)
Jeanice M. Brown Thomas, David L. Duewer
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat-soluble vitamins and carotenoids in human serum and plasma. This report describes the design

Enhancing the Efficacy of Cancer Therapy: Use of Small Molecule Inhibitors of DNA Glycosylases as Potential Drugs

March 12, 2017
Author(s)
Erdem Coskun, Aaron C. Jacobs, Nathan Donley, Marcus J. Calkins, Dorjbal Dorjsuren, David Maloney, Anton Simeonov, Pawel Jaruga, Amanda K. McCullough, M Miral Dizdar, R. S. Lloyd
Chemotherapy aims to destroy cancer cells by damaging their DNA. However, the overexpression of DNA repair proteins in cancer cells causes the removal of DNA lesions before they become toxic and thus leads to an increased DNA repair capacity resulting in

Experimental and statistical methods to evaluate antibacterial activity of a quaternary pyridinium salt on planktonic, biofilm-forming, and biofilm states

March 3, 2017
Author(s)
Daneli Lopez-Perez, Paula J. Baker, Adam L. Pintar, Jirun Sun, Nancy Lin, Sheng Lin-Gibson
Robust evaluation and comparison of antimicrobial technologies are critical to improving biofilm prevention and treatment. Herein, a multi-pronged experimental framework and statistical models were applied to determine the effects of quaternary pyridinium

Standardizing CT Lung Density Measure Across Scanner Manufacturers

March 1, 2017
Author(s)
Huaiyu H. Chen-Mayer, Matthew Fuld, Bernice Hoppel, Phillip Judy, Junfeng Guo, David Lynch, Antonio M. Possolo, Sean B. Fain
Computed Tomography imaging of the lung, reported in Hounsfield Units (HU), can be parameterized as a quantitative image biomarker for the diagnosis and monitoring of lung density changes due to emphysema, a type of chronic obstructive pulmonary disease

Extracting Two Parameters From a P2 Orientation Distribution

February 19, 2017
Author(s)
Curtis Meuse, Joseph B. Hubbard
Individual molecules are seldom identical. This poses a problem for optical spectroscopy. For instance, if molecular property distributions are not characterized, differences in the distribution of molecular properties between sample and standards are

Structural Calcium (Trypsin, Subtilisin)

February 19, 2017
Author(s)
G L. Gilliland, A Teplyakov
There are about 40 families of serine proteases defined by amino acid sequence similarities that can be further grouped into 7 clans on the basis of their tertiary structure and the order of the catalytic triad. 1 Members of clans SA and SB are

Self-contained, Low Cost “Body-on-a-Chip” Systems for Drug Development

February 17, 2017
Author(s)
Ying Wang, Oleaga Carlota, Long Christopher, McAleer Christopher, Paula Miller, James J. Hickman, Michael L. Shuler, Mandy B. Esch
Integrated multi-organ microphysiological systems are an evolving tool for preclinical evaluation of the potential toxicity and efficacy of drug candidates. Such systems, also known as “Body-on-a-Chip” devices, have a great potential to increase the

Repair of Oxidatively Induced DNA Damage by DNA Glycosylases

February 16, 2017
Author(s)
M Miral Dizdar, Erdem Coskun, Pawel Jaruga
Endogenous and exogenous reactive species cause oxidatively induced DNA damage in living organisms by a variety of mechanisms. As a result, a plethora of mutagenic and/or cytotoxic products are formed in cellular DNA. This type of DNA damage is repaired by

Cytochrome P450 27A1 Deficiency and Regional Differences in Brain Sterol Metabolism Cause Preferential Cholestanol Accumulation in the Cerebellum

February 11, 2017
Author(s)
Natalia Mast, Kyle Anderson, Joseph Lin, Yong Li, Illarion Turko, Curtis Tatsuoka, Ingemar Bjorkhem, Irina A. Pikuleva
Cytochrome P450 27A1 (CYP27A1 or sterol 27-hydroxylase) is a ubiquitous, multifunctional enzyme catalyzing regio- and stereo-specific hydroxylation of different sterols. In humans, complete CYP27A1 deficiency leads to cerebrotendinous xanthomatosis or

Biophysical Characterization of Functionalized Titania Nanoparticles and Their Application in Dental Adhesives

February 2, 2017
Author(s)
Jirun Sun, Elijah J. Petersen, Stephanie S. Watson, Christopher M. Sims, Alexander Kassman, Stanislav A. Frukhtbeyn, Drago Skrtic, Meryem T. Ok, Deborah S. Jacobs, Qiang Ye, Bryant C. Nelson
It is demonstrated that carboxylic acid-functionalized titanium dioxide (TiO2) NPs produce significantly higher levels of reactive oxygen species (ROS) after visible light irradiation (400–800 nm, 1600 mW/cm2) in comparison to nonfunctionalized TiO2 NPs

Standardization, Calibration, and Control in Flow Cytometry

January 6, 2017
Author(s)
Lili Wang, Robert A. Hoffman
Standardization, control, and calibration provide different degrees of certainty about the data acquired with an instrument. Each process is aimed at assuring that results from the instrument have the quality required for the intended purpose. The purpose

Oxidatively Induced DNA Damage and Its Repair

December 30, 2016
Author(s)
M Miral Dizdar
Endogenous and exogenous reactive species react with DNA in living organisms by numerous mechanisms and cause oxidatively induced DNA damage with multiple lesions. If not repaired, DNA lesions can cause genetic instability, leading to mutagenesis and cell

Summary of NIST/SIM Chemical Metrology Working Group Training Opportunity: Isotope Dilution-Mass Spectrometry Clinical Measurement Course

December 22, 2016
Author(s)
Jeanita Pritchett, Katrice A. Lippa, Mary Bedner, Carolyn Q. Burdette, Johanna Camara, Brian E. Lang, Michael A. Nelson, Lane C. Sander, Lorna T. Sniegoski
The one week NIST-SIM chemical metrology training opportunity was designed to provide SIM NMI/DI laboratory personnel with in-depth classroom and hands-on laboratory experience for the implementation of isotope dilution/mass spectrometry (ID/MS) methods in

Enhanced Sensitivity of Neil1-/- Mice to Chronic UVB Exposure

December 1, 2016
Author(s)
M Miral Dizdar, Marcus J. Calkins, Vladimir Vartanian, Guldal Kirkali, Amanda K. McCullough, R. S. Lloyd, Pawel Jaruga
DNA base damage induced by oxidative stress and reactive oxygen species (ROS) are thought to be central mediators of ultraviolet light (UV)-induced carcinogenesis and skin aging. However, increased steady-state levels of ROS-induced DNA base damage have

Alterations in eicosanoid composition during embryonic development in the chorioallantoic membrane of the American alligator (Alligator mississippiensis) and domestic chicken (Gallus gallus)

November 1, 2016
Author(s)
John Bowden, Theresa M. Cantu, Jacob Scott, Jimena B. Perez-Viscasillas, Kevin M. Huncik, Matthew P. Guillette, Louis J. Guillette Jr.
Eicosanoids are signaling lipids that regulate several physiological processes in the mammalian placenta, including the initiation of parturition. Though all amniotes construct similar extraembryonic membranes during development, the composition and
Displaying 176 - 200 of 802