A 40 °C. ISOTHERMAL CALORIMETER

1950 ◽  
Vol 28b (10) ◽  
pp. 639-643 ◽  
Author(s):  
C. C. Coffin ◽  
E. J. Caule
Keyword(s):  
Solid State ◽  
Constant Pressure ◽  
Direct Determination ◽  
Controlled Conditions ◽  
Isothermal Calorimeter ◽  
Mantle Thickness

A 40° Bunsen-type isothermal calorimeter has been built and tested. The working substance, benzalacetone, is thermostatted by the vapor of methylal boiling under a constant pressure. An impurity in the benzalacetone makes it necessary to calibrate the instrument in exactly the same way in which it is to be used. Under carefully controlled conditions and with a constant mantle thickness the reproducibility is of the order of 0.2%. With about half the benzalacetone in the solid state, the calorimeter constant was found to be 0.0455 (± 0.0001) gm. of mercury per calorie. This instrument, which can be readily adapted to micro and semimicro work, was designed primarily for the direct determination of the heats and rates of certain enzymatic and bacteriological processes.

scholarly journals Direct Determination of a Molecular Torsional Angle in the Membrane Protein Rhodopsin by Solid-State NMR

1997 ◽  
Vol 119 (29) ◽  
pp. 6853-6857 ◽  
Author(s):  
X. Feng ◽  
P. J. E. Verdegem ◽  
Y. K. Lee ◽  
D. Sandström ◽  
M. Edén ◽  
...  
Keyword(s):  
Solid State ◽  
Membrane Protein ◽  
Solid State Nmr ◽  
Direct Determination ◽  
Torsional Angle

Direct determination of a molecular torsional angle by solid-state NMR

1996 ◽  
Vol 257 (3-4) ◽  
pp. 314-320 ◽  
Author(s):  
X. Feng ◽  
Y.K. Lee ◽  
D. Sandstrom ◽  
M. Edén ◽  
H. Maisel ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Direct Determination ◽  
Torsional Angle

Direct Determination of a Peptide Torsional Angle ψ by Double-Quantum Solid-State NMR

1997 ◽  
Vol 119 (49) ◽  
pp. 12006-12007 ◽  
Author(s):  
X. Feng ◽  
M. Edén ◽  
A. Brinkmann ◽  
H. Luthman ◽  
L. Eriksson ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Direct Determination ◽  
Double Quantum ◽  
Torsional Angle ◽  
Quantum Solid

scholarly journals A Theoretical Assessment of the Structure Determination of Multi-Span Membrane Proteins by Oriented Sample Solid-State NMR Spectroscopy

2020 ◽  
Vol 73 (3) ◽  
pp. 246 ◽  
Author(s):  
Daniel K. Weber ◽  
Gianluigi Veglia
Keyword(s):  
Solid State ◽  
Membrane Proteins ◽  
Lipid Bilayers ◽  
Solid State Nmr ◽  
Direct Determination ◽  
Oriented Sample ◽  
Dynamics Simulations ◽  
G Protein Coupled ◽  
Theoretical Assessment

Oriented sample solid-state NMR (OS-ssNMR) spectroscopy allows the direct determination of the structure and topology of membrane proteins reconstituted into aligned lipid bilayers. Although OS-ssNMR theoretically has no upper size limit, its application to multi-span membrane proteins has not been established because most studies have been restricted to single- or dual-span proteins and peptides. Here, we present a critical assessment of the application of this method to multi-span membrane proteins. We used molecular dynamics simulations to back-calculate [15N-1H] separated local field (SLF) spectra from a G protein-coupled receptor (GPCR) and show that fully resolved spectra can be obtained theoretically for a multi-span membrane protein with currently achievable resonance linewidths.

Direct determination of bulk etching rate for LR-115-II solid state nuclear track detectors

Pramana ◽  
2006 ◽  
Vol 67 (3) ◽  
pp. 529-534 ◽  
Author(s):  
T A Salama ◽  
U Seddik ◽  
T M Hegazy ◽  
A Ahmed Morsy
Keyword(s):  
Solid State ◽  
Etching Rate ◽  
Direct Determination ◽  
Nuclear Track Detectors

The Direct Determination of I131 in Heterogeneous Fecal Specimens

1961 ◽  
Vol 41 (4) ◽  
pp. 380-384 ◽  
Author(s):  
Arthur F. Dratz ◽  
James C. Coberly
Keyword(s):  
Direct Determination
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