Automated differential scanning calorimetry at low temperatures

1985 ◽  
Vol 6 (2) ◽  
pp. 165-175 ◽  
Author(s):  
�. Fransson ◽  
G. B�ckstr�m
Keyword(s):  
Differential Scanning Calorimetry ◽  
Low Temperatures ◽  
Scanning Calorimetry

The Crystal Structures at 10 K of the Trigonal Salts KMIII(NH3)6(ClO4)2Cl2, MIII = Os and Cr, and the Possibility of Phase Transitions

1999 ◽  
Vol 52 (3) ◽  
pp. 219 ◽  
Author(s):  
Philip A. Reynolds ◽  
Brian N. Figgis ◽  
Alexander N. Sobolev
Keyword(s):  
Differential Scanning Calorimetry ◽  
Transition Temperature ◽  
Crystal Structures ◽  
Low Temperatures ◽  
Simple Structure ◽  
Alkali Metal Cations ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Threefold Axis ◽  
X Ray

The crystal structures of KOs(NH3)3(ClO4)2Cl2 and KCr(NH3)6(ClO4)2Cl2 were determined at 10 K by X-ray diffraction, and for the osmium salt also at 293 K. At 293 K the osmium salt is trigonal, space group R 3m, with the same simple structure as others of this class of double salt. At 10 K, in agreement with previous radius ratio predictions, both crystals are best described as remaining R 3m. All previously studied members, with larger alkali metal cations, are twinned R 3 at low temperatures, with small, symmetry-breaking rotations of the hexaamminemetal(III) and perchlorate ions about the threefold axis. Differential scanning calorimetry on CsRu(NH3)6(ClO4)2Cl2 suggests that the R 3m to R 3 change is very extended in temperature with only a small discontinuity at the transition temperature.

Differential scanning calorimetry applied to the storage at ultra low temperatures of olive and hop in vitro grown shoot-tips

2000 ◽  
Vol 349 (1-2) ◽  
pp. 147-151 ◽  
Author(s):  
David Martı́nez ◽  
M Ángeles Revilla ◽  
Aránzazu Espina ◽  
José R Garcı́a
Keyword(s):  
Differential Scanning Calorimetry ◽  
Low Temperatures ◽  
Shoot Tips ◽  
Scanning Calorimetry

scholarly journals The Two Faces of the Liquid Ordered Phase

2021 ◽  
Author(s):  
Itay Schachter ◽  
Riku Paananen ◽  
Balazs Fabian ◽  
Piotr Jurkiewicz ◽  
Matti Javanainen
Keyword(s):  
Molecular Dynamics ◽  
Differential Scanning Calorimetry ◽  
Low Temperatures ◽  
High Mobility ◽  
Membrane Properties ◽  
Scanning Calorimetry ◽  
Lipid Mixtures ◽  
Liquid Ordered ◽  
Raft Domains ◽  
Dynamics Simulations

The coexistence of liquid ordered Lo and liquid disordered Ld phases in synthetic and plasma membrane-derived vesicles serves as a model for biomembrane heterogeneity. However, the connection between the structures of microscopic phases present in vesicles at low temperatures and the tiny ordered "raft" domains of biomembranes at body temperature is unclear. To study the Lo phase structure across temperatures, we performed atomistic molecular dynamics simulations, differential scanning calorimetry, and fluorescence spectroscopy on the Lo phase in binary and ternary lipid mixtures. Our results reveal an Lo phase with highly ordered and hexagonally packed clusters of saturated lipid chains at low temperatures. These clusters melt upon heating, and numerous membrane properties reflect this transition as two regimes with different temperature dependence. Still, the transition between the regimes is continuous, and they both match the description of the Lo phase with high order and relatively high mobility. Our findings question the use of vesicles displaying Lo–Ld coexistence as models for heterogeneity in cellular membranes, as they likely correspond to different molecular organizations.

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