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11. Results of an international comparison for the activity measurement of 177Lu
Published: 3/6/2012
Authors: Brian Edward Zimmerman, Denis E Bergeron, Jeffrey T Cessna
Abstract: An international Key Comparison of 177Lu has recently been carried out. Twelve laboratories performed assays for radioactivity content on aliquots of a common master solution of 177Lu, leading to eleven results submitted for entry into the Key Compar ...

12. 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 ...

13. 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 ...

14. 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 ...

15. 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 ...

16. 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+ ...

17. 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 ...

18. 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 ...

19. 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 ...

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