Practical corrections for p(H,D) measurements in mixed H2O/D2O biological buffers

2017 ◽  
Vol 9 (18) ◽  
pp. 2744-2750 ◽  
Author(s):  
Kenneth A. Rubinson
Keyword(s):  
Surface Equilibrium ◽  
Biological Buffers

Changes in the p(H,D) measured in H2O and D2O may be small since the glass electrode's surface equilibrium changes too.

scholarly journals Rapid Dissolution of ZnO Nanoparticles Induced by Biological Buffers Significantly Impacts Cytotoxicity

2017 ◽  
Vol 30 (8) ◽  
pp. 1641-1651 ◽  
Author(s):  
Josh E. Eixenberger ◽  
Catherine B. Anders ◽  
Rebecca J. Hermann ◽  
Raquel J. Brown ◽  
Kongara M. Reddy ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Rapid Dissolution ◽  
Biological Buffers

Evidence for Gas–Surface Equilibrium Control of Indoor Nitrous Acid

2018 ◽  
Vol 52 (21) ◽  
pp. 12419-12427 ◽  
Author(s):  
Douglas B. Collins ◽  
Rachel F. Hems ◽  
Shouming Zhou ◽  
Chen Wang ◽  
Eloi Grignon ◽  
...  
Keyword(s):  
Nitrous Acid ◽  
Equilibrium Control ◽  
Surface Equilibrium

The effects of biological buffers TRIS, TAPS, TES on the stability of lysozyme

2018 ◽  
Vol 112 ◽  
pp. 720-727 ◽  
Author(s):  
Pavani Pannuru ◽  
Anjeeta Rani ◽  
Pannuru Venkatesu ◽  
Ming-Jer Lee
Keyword(s):  
The Stability ◽  
Biological Buffers

scholarly journals Sonication-enabled rapid production of stable liquid metal nanoparticles grafted with poly(1-octadecene-alt-maleic anhydride) in aqueous solutions

Nanoscale ◽  
2018 ◽  
Vol 10 (42) ◽  
pp. 19871-19878 ◽  
Author(s):  
Yiliang Lin ◽  
Jan Genzer ◽  
Weihua Li ◽  
Ruirui Qiao ◽  
Michael D. Dickey ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Liquid Metal ◽  
Aqueous Solutions ◽  
Metal Nanoparticles ◽  
Rapid Production ◽  
Biological Buffers

We demonstrate sonication-enabled production of liquid metal nanoparticles grafted with poly(1-octadecene-alt-maleic anhydride) in water that remain stable in biological buffers.

scholarly journals Comparison of zwitterionic N-alkylaminomethanesulfonic acids to related compounds in the Good buffer series

2010 ◽  
Vol 6 ◽  
Author(s):  
Robert D Long ◽  
Newton P Hilliard ◽  
Suneel A Chhatre ◽  
Tatiana V Timofeeva ◽  
Andrey A Yakovenko ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Aqueous Solubility ◽  
Carbon Chain ◽  
Secondary Amines ◽  
Ammonium Ion ◽  
X Ray ◽  
Crystallographic Structures ◽  
Related Compounds ◽  
Sulfonic Acid Groups ◽  
Biological Buffers

Several N-alkyl and N,N-dialkylaminomethanesulfonic acids were synthesized (as zwitterions and/or sodium salts) to be tested for utility as biological buffers at lower pH levels than existing Good buffer compounds (aminoalkanesulfonates with a minimum of two carbons between amine and sulfonic acid groups as originally described by Norman Good, and in common use as biological buffers). Our hypothesis was that a shorter carbon chain (one carbon) between the amino and sulfonic acid groups should lower the ammonium ion pK a values. The alkylaminomethanesulfonate compounds were synthesized in aqueous solution by reaction of primary or secondary amines with formaldehyde/sodium hydrogensulfite addition compound. The pK a values of the ammonium ions of this series of compounds (compared to existing Good buffers) was found to correlate well with the length of the carbon chain between the amino and sulfonate moeties, with a significant decrease in amine basicity in the aminomethanesulfonate compounds (pK a decrease of 2 units or more compared to existing Good buffers). An exception was found for the 2-hydroxypiperazine series which shows only a small pK a decrease, probably due to the site of protonation in this compound (as confirmed by X-ray crystal structure). X-ray crystallographic structures of two members of the series are reported. Several of these compounds have pK a values that would indicate potential utility for buffering at pH levels below the normal physiological range (pK a values in the range of 3 to 6 without aqueous solubility problems) – a range that is problematic for currently available Good buffers. Unfortunately, the alkylaminomethanesulfonates were found to degrade (with loss of their buffering ability) at pH levels below the pK a value and were unstable at elevated temperature (as when autoclaving) – thus limiting their utility.

scholarly journals Synthesis of Gold Nanoparticles with Buffer-Dependent Variations of Size and Morphology in Biological Buffers

2016 ◽  
Vol 11 (1) ◽  
Author(s):  
Syed Rahin Ahmed ◽  
Sangjin Oh ◽  
Rina Baba ◽  
Hongjian Zhou ◽  
Sungu Hwang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Size And Morphology ◽  
Biological Buffers

Evidence of Quantum Motion of Hydrogen on Pd(111) in He-Diffraction data

1990 ◽  
Vol 208 ◽  
Author(s):  
C-H. Hsu ◽  
B. E. Larson ◽  
M. El-Batanouny ◽  
C. R. Willis ◽  
K. M. Martini
Keyword(s):  
Surface Charge Density ◽  
Scattering Data ◽  
Quantum Mechanical ◽  
Satisfactory Explanation ◽  
Beam Scattering ◽  
Saturation Coverage ◽  
Surface Equilibrium ◽  
Mechanical Interpretation ◽  
Quantum Motion ◽  
Anomalous Attenuation

ABSTRACTWe present elastic He-beam scattering data of the Pd(111)/H system. Diffraction intensities were measured as a function of surface temperature in the range 140°K–320°K. Two remarkable features are observed : the first is the presence of C3v symmetry at (1 × 1) saturation coverage (140°K) and its transformation to C6v symmetry at lower coverages (270°K). The second feature is the anomalous attenuation of the specular He beam accompanying this transformation. Taken together these features provide strong evidence of a fundamental change in the surface charge density corrugation. A classical interpretation of the motion of hydrogen either fails to reproduce the measured attenuation or leads to contradictory and unphysical conclusions regarding the H-metal bond length or surface equilibrium. An alternative quantum mechanical interpretation is developed and is shown to provide consistent and satisfactory explanation of the measurements.

Sign in / Sign up

Export Citation Format

Share Document