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Author: denis bergeron
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1. The effect of impurities on calculated activity in the triple-to-double coincidence ratio liquid scintillation method
Published: 3/4/2012
Authors: Denis E Bergeron, Ryan P Fitzgerald, Brian Edward Zimmerman, Jeffrey T Cessna
Abstract: In the triple-to-double coincidence ratio (TDCR) method of liquid scintillation counting, unaccounted or improperly accounted impurities can result in lower-than-expected or higher-than-expected recovered activities, depending on the counting efficie ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909218

2. Determination of micelle size in some commercial liquid scintillation cocktails
Published: 3/3/2012
Author: Denis E Bergeron
Abstract: We performed dynamic light scattering measurements on commercially available liquid scintillation (LS) cocktails over a range of aqueous and acid contents. In all cases, we measured hydrodynamic diameters substantially smaller than the current de fa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908599

3. Development of secondary standards for radium-223
Published: 11/5/2009
Authors: Denis E Bergeron, Brian Edward Zimmerman, Jeffrey T Cessna
Abstract: 223Ra is a bone-seeking alpha emitter, and as such is currently being evaluated as a radiopharmaceutical for the treatment of skeletal metastases. In the clinical setting, dosage measurements are typically achieved with reentrant ionization chambers ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903048

4. Identification of Active Sites of Biomolecules II: Saccharide and Transition Metal ion in Aqueous Solution
Published: 2/23/2009
Authors: Orkid Coskuner, Denis E Bergeron, Luis Cipriano Rincon, Jeffrey W Hudgens, Carlos A Gonzalez
Abstract: We discuss the coordination mechanism of FeIII and methyl-a-mannopyranoside in aqueous solution using a recently presented integrated approach comprising ab initio electronic structure calculations, molecular dynamics simulations, and mass spectrome ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832324

5. Ligand Exchange Reactions in the Formation of Diphosphine-Protected Gold Clusters
Published: 8/14/2008
Authors: Denis E Bergeron, Orkid Coskuner, Jeffrey W Hudgens, Carlos A Gonzalez
Abstract: Electrospray ionization mass spectrometry is employed to study the formation of L3- and L5-protected gold clusters (L3 = 1,3-Bis(diphenylphosphino)propane; L5 = 1,5-Bis(diphenylphosphino)pentane), and it is found that molecular complexes in which Au+ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832202

6. Glycosidic Linkage Conformation of Methyl-alpha-Mannopyranoside
Published: 7/31/2008
Authors: Orkid Coskuner, Denis E Bergeron, Luis Cipriano Rincon, Jeffrey W Hudgens, Carlos A Gonzalez
Abstract: We study the preferred conformation of the glycosidic linkage of methyl--mannopyranoside in the gas phase and in aqueous solution. Results obtained utilizing Car Parrinello molecular dynamics (CPMD) simulations are compared to those obtained ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832224

7. Impact of Swapping Ethyl for Phenyl Groups on Diphosphine-Protected Undecagold
Published: 9/1/2007
Authors: Justin Golightly, Lin Gao, A Welford Castleman, Denis E Bergeron, Jeffrey W Hudgens, Rudolph Magyar, Carlos A Gonzalez
Abstract: 1,3-Bis(diethylphosphino)propane (depp) protected gold clusters are synthesized and studied via electrospray ionization mass spectrometry. An undecagold cluster, [Au11(depp)4Cl2]+, is observed under soft ionization conditions, and is found to persis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832010

8. Ligand Dissociation and Core Fission from Diphosphine Protected Gold Clusters
Published: 5/19/2007
Authors: Denis E Bergeron, Jeffrey W Hudgens
Abstract: Highly monodisperse samples of diphosphine ligand (1,3-Bis(diphenylphosphino)propane or 1,5-bis(diphenylphosphino)pentane) protected gold nanoparticles form rapidly in a mixed methanol/chloroform solvent environment. Methanol soluble octagold, decag ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832001