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Chemistry

Analytical chemistry

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Displaying 226 - 250 of 4041

Certification of NIST Gas Mixture Standard Reference Materials

February 10, 2022
Author(s)
Christina Cecelski, Kimberly Harris, Cassie Goodman, William A. Kimes, Philip Liu, Walter R. Miller Jr., Jennifer Carney
The Gas Sensing Metrology Group at NIST provides accurate, stable gaseous standards for use in various types of emissions testing and environmental monitoring. The group develops and maintains the highest level of primary gas standards, which provide

Micro to nano: multiscale IR analyses reveal zinc soap heterogeneity in a 19th-century painting by Corot

February 9, 2022
Author(s)
Xiao Ma, Georges Pavlidis, Eoghan Dillon, Victoria Beltran, Jeffrey Schwartz, Mathieu Thoury, Ferenc Borondics, Christophe Sandt, Kevin Kjoller, Barbara Berrie, Andrea Centrone
The formation and aggregation of metal carboxylates (metal-soaps) can degrade the appearance and integrity of oil paints and frequently poses a challenge to the conservation of painted works of art. Efforts to understand the root cause of metal-soap

Optofluidic Flow Meter for sub-nanoliter per minute flow measurements

January 31, 2022
Author(s)
Jalal Sadeghi, Paul Patrone, Anthony J. Kearsley, Gregory A. Cooksey
Performance improvements in microfluidic systems depend on accurate measurement and control of fluids on the micro- and nanoscale, and new applications are continuously moving the needle to lower volumetric flow rates. This work focuses on improving an

Prompt-gamma activation analysis and its application to cultural heritage

January 25, 2022
Author(s)
Zsolt Kasztovszky, Christian Stieghorst, Heather H. Chen-Mayer, Richard Livingston, Richard M. Lindstrom
Prompt-gamma activation analysis (PGAA) provides a unique opportunity to investigate valuable material without destroying any of it. The method is perfectly applicable to investigate valuable objects belonging to our cultural heritage, as well as other

Value Assignment of Reference Material 8404 Almond Flour for Allergen Detection

January 21, 2022
Author(s)
Melissa M. Phillips, David M. Bunk, Ashley Beasley Green, James H. Yen
The National Institute of Standards and Technology (NIST) recently released RM 8404 Almond Flour for Allergen Detection, which is intended for harmonizing measurements of allergenic proteins in foods. The material was purchased from a commercial vendor and

Value Assignment of Reference Material 8405 Hazelnut Flour for Allergen Detection

January 21, 2022
Author(s)
Melissa M. Phillips, David M. Bunk, Ashley Beasley Green, James H. Yen
The National Institute of Standards and Technology (NIST) recently released RM 8405 Hazelnut Flour for Allergen Detection, which is intended for harmonizing measurements of allergenic proteins in foods. The material was purchased from a commercial vendor

Peak Fraction Purity and Chromatographic Resolution: Gaussian Peaks Revisited

January 19, 2022
Author(s)
Andre Striegel, Deborah Striegel
For incompletely resolved peak pairs, the purity of the chromatographic or fractographic fractions is oftentimes underestimated by the common user. This results in wasted time and effort while trying to achieve higher resolution than needed for the

Understanding the dynamics of physiological changes, protein expression, and PFAS in wildlife

January 15, 2022
Author(s)
Jacqueline Bangma, T.C. Guillette, Paige Bommarito, Carla Ng, Jessica Reiner, Andrew Lindstrom, Mark Strynar
Per- and polyfluoroalkyl substances (PFAS) accumulation and elimination in both wildlife and humans is largely attributed to PFAS interactions with proteins, including but not limited to organic anion transporters (OATs), fatty acid binding proteins (FABPs

Sub-picoliter Traceability of Microdroplet Gravimetry and Microscopy

December 20, 2021
Author(s)
Lindsay C. C. Elliott, Adam L. Pintar, Craig R. Copeland, Thomas Brian Renegar, Ronald G. Dixson, Robert Ilic, R. Michael Verkouteren, Samuel M. Stavis
Volumetric analysis of single microdroplets is difficult to perform by ensemble gravimetry, whereas optical microscopy is often inaccurate beyond the resolution limit. To address the latter issue, we advance and integrate these complementary methods

Considerations in applying neutron depth profiling to Li-ion battery research

December 14, 2021
Author(s)
Daniel Lyons, Jamie Weaver, Anne Co
Li distribution within micron-scale battery electrode materials is quantified with neutron depth profiling (NDP). This method allows determination of intra- and inter-electrode parameters such as lithiation efficiency, electrode morphology change and Li

HDX-MS and MD simulations provide evidence for stabilization of the IgG1- FcgRIa (CD64a) immune complex through intermolecular glycoprotein bonds

December 8, 2021
Author(s)
Kyle Anderson, Kerry Scott, Christina Bergonzo, Ioannis Karageorgos, Elyssia Gallagher, Venkata Tayi, Michael Butler, Jeffrey W. Hudgens
Previous reports present different models for the stabilization of the Fc—FcγRI immune complex. Although accord exists on the importance of L235 in IgG1 and some hydrophobic contacts for complex stabilization, discord exists regarding the existence of
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