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Physics

Biological Physics

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Displaying 201 - 225 of 378

Direct measurement of Vorticella contraction force by micropipette deflection

February 17, 2017
Author(s)
Danielle C. France, Jonathan Tejada, Paul Matsudaira
The ciliated protozoan Vorticella convallaria is noted for its exceptionally fast ATP-independent cellular contraction, but direct measurements of contractile force have proven difficult given the length scale, speed, and forces involved. We used high

Accuracy of magnetic resonance based susceptibility measurements

February 6, 2017
Author(s)
Hannah E. Erdevig, Stephen E. Russek, Slavka Carnicka, Karl F. Stupic, Kathryn E. Keenan
Magnetic Resonance Imaging (MRI) is increasingly used to map the magnetic susceptibility of tissue to identify cerebral microbleeds associated with traumatic brain injury and pathological iron deposits associated with neurodegenerative diseases such as

Multispectral MR imaging and sensing using shaped nanoparticles

November 26, 2016
Author(s)
Gary Zabow
The idea that size and shape can determine color is well known in optics-based quantum dot and plasmonic nanoparticle fields. But what about in the radio-frequency (RF) portion of the spectrum? This chapter reviews recent work on specially shaped magnetic

Report for Dedicated JPSS VIIRS Ocean Color Calibration/Validation Cruise December 2015

October 30, 2016
Author(s)
Michael Ondrusek, Veronica P. Lance, Eric Stengel, Menghua Wang, Zhongping Lee, Jianwei Wei, Junfang Lin, Chuanmin Hu, Charles Kovach, David English, Jennifer Cannizzaro, Alex Gilerson, Sam Ahmed, Carlos Carrizo, Ahmed El-Habashi, Robert Foster, Matteo Ottaviani, Robert Arnone, Sherwin Ladner, Wesley Goode, Ryan Vandermeulen, Nicholas Tufillaro, Jasmine Nahorniak, Curtiss Davis, Joaquim I. Goes, Kali McKee, Scott Freeman, Joaquin E. Chaves Cedeno, Kenneth Voss, B. Carol Johnson

A medical device-grade T1 and ECV phantom for global T1 mapping quality assurance - The T 1 Mapping and ECV Standardization in cardiovascular magnetic resonance (T1MES) program

September 22, 2016
Author(s)
Gabriella Captur, Peter Gatehouse, Katy Keenan, Friso Heslinga, Ruediger Bruehl, Marcel Prothmann, Martin J. Graves, Richard J. Eames, Camilla Torlasco, Giulia Benedetti, Jacqueline Donovan, Bernd Ittermann, Redha Boubertakh, Andrew Bathgate, Celine Royet, Wenjie Pang, Reza Nezafat, Michael Salerno, Peter Kellman, James C. Moon
Background: T1 mapping and extracellular volume (ECV) have the potential to guide patient care and serve as surrogate end-points in clinical trials, but measurements differ between cardiovascular magnetic resonance (CMR) scanners and pulse sequences. To

Surface plasmon resonance microscopy: achieving a quantitative optical response

September 7, 2016
Author(s)
Alexander Peterson, Michael Halter, Anne Plant, John Elliott
Surface plasmon resonance imaging (SPRI) allows real-time label-free imaging based on index of refraction, and changes in index of refraction at an interface. SPRI can be carried out on a microscope by launching light into a sample, and collecting

Temperature measurements in MRI using ferromagnetic particles

August 9, 2016
Author(s)
Karl F. Stupic, Janusz H. Hankiewicz, Zbigniew Celinski, Robert E. Camley
We explore the possibility of using small ferromagnetic particles with a strong temperature- dependent magnetization to produce temperature maps using magnetic resonance imaging (MRI). We present the first experimental results showing that the 1H nuclear

Real-Time, Single Molecule Electronic DNA Sequencing by Synthesis Using Polymer Tagged Nucleotides on a Nanopore Array

May 10, 2016
Author(s)
Carl Fuller, Shiv Kumar, Mintu Porel, Michen Chien, Arek Bibillo, P. B. Stranges, Michael Dorwart, Chuanjua Tao, Zengmin Li, Wenjing Guo, Shundi Shi, Daniel Korenblum, Andrew Trans, Anne Aguirre, Edward Liu, Takeshi Harada, James Pollard, Ashwini Bhat, Cynthia Cech, Alexander Yang, Cleoma Spilman, Mirko Palla, Jennifer Hovis, Roger Chen, Irina Morozova, Sergey Kalachikov, James Russo, John J. Kasianowicz, Stefan Roever, George Church, Jingyue Ju
DNA sequencing by synthesis (SBS) offers a robust platform to decipher nucleic acid sequences. Recently, we developed a single molecule nanopore-based SBS strategy (NanoSBS) that accurately distinguishes four bases by electronically detecting and

National Institute of Standards and Technology measurement service of the optical properties of biomedical phantoms: Current status

March 24, 2016
Author(s)
Paul Lemaillet, Catherine C. Cooksey, Zachary H. Levine, Adam L. Pintar, Jeeseong Hwang, David W. Allen
The National Institute for Standards and Technology (NIST) has maintained scales of reflectance and transmittance over several decades. Those scales are primarily intended for the regular transmittance, mirrors, and solid surface scattering diffusers. The
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