Raman microspectroscopy of noncancerous and cancerous human breast tissues. Identification and phase transitions of linoleic and oleic acids by Raman low-temperature studies

The Analyst ◽  
2015 ◽  
Vol 140 (7) ◽  
pp. 2134-2143 ◽  
Author(s):  
Beata Brozek-Pluska ◽  
Monika Kopec ◽  
Jakub Surmacki ◽  
Halina Abramczyk
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Room Temperature ◽  
Raman Microspectroscopy ◽  
Vibrational Properties ◽  
Human Breast ◽  
Temperature Range ◽  
Breast Tissues

We present the results of Raman studies in the temperature range of 293–77 K on vibrational properties of linoleic and oleic acids and Raman microspectroscopy of human breast tissues at room temperature.

Single-Crystal X-Ray Scattering Study of Superstructures and Phase Transitions in Graphite-Hno3 and Graphite-Br2 Intercalation Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
R. Moret ◽  
R. Comes ◽  
G. Furdin ◽  
H. Fuzellier ◽  
F. Rousseaux
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Room Temperature ◽  
Temperature Phase ◽  
Temperature Structure ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Temperature Liquid ◽  
Low Temperature Phase

ABSTRACTIn α-C5n-HNO3 the condensation of the room-temperature liquid-like diffuse ring associated with the disorder-order transition around 250 K is studied and the low-temperature. superstructure is examined.It is found that β-C8n-HNO3 exhibits an in-plane incommensurate order at room temperature.Two types of graphite-Br2 are found. Low-temperature phase transitions in C8Br are observed at T1 ≍ 277 K and T2 ≍ 297 K. The room-temperature structure of C14Br is reexamined. Special attention is given to diffuse scattering and incommensurability.

Low-temperature crystal structure of RS-thiocamphor

2004 ◽  
Vol 219 (9) ◽  
Author(s):  
E. Louise R. Robins ◽  
Michela Brunelli ◽  
Asiloé J. Mora ◽  
Andrew N. Fitch
Keyword(s):  
Crystal Structure ◽  
Phase Transitions ◽  
Low Temperature ◽  
Room Temperature ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Two Phase ◽  
X Ray ◽  
Low Temperature Crystal Structure

AbstractDSC and high-resolution powder X-ray diffraction measurements in the range 295 K–100 K show that RS-thiocamphor undergoes two phase transitions. The first, at around 260 K on cooling, is from the room-temperature body-centred-cubic phase to a short-lived intermediate. At 258 K the low-temperature form starts to appear. The crystal structure of the latter is orthorhombic, space group

scholarly journals A novel looped low-temperature heat-driven thermoacoustic refrigerator operating in room temperature range

2019 ◽  
Vol 158 ◽  
pp. 1653-1659 ◽  
Author(s):  
Huizhi Wang ◽  
Guoyao Yu ◽  
Jianying Hu ◽  
Zhanghua Wu ◽  
Mingyu Hou ◽  
...  
Keyword(s):  
Low Temperature ◽  
Room Temperature ◽  
Temperature Range ◽  
Temperature Heat ◽  
Thermoacoustic Refrigerator

Thermal Expansion and Phase Transitions in Na3H(SO4)2 Sulfate in the Low-Temperature Range

2019 ◽  
Vol 45 (5) ◽  
pp. 395-397
Author(s):  
N. V. Dmitrieva ◽  
R. S. Bubnova ◽  
S. K. Filatov ◽  
A. P. Shablinskii ◽  
M. G. Krzhizhanovskaya
Keyword(s):  
Thermal Expansion ◽  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Range

Notizen: Austausch von Nitrit- gegen Bromidanionen in Na3NO3 / Replacement of Nitrite by Bromide Anions in Na3NO3

1989 ◽  
Vol 44 (8) ◽  
pp. 996-998 ◽  
Author(s):  
M. Jansen ◽  
W. Müller
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Solid Solutions ◽  
Room Temperature ◽  
Mixed Crystals ◽  
Miscibility Gap ◽  
Temperature Range ◽  
Collective Interactions

Na3O(NO2) and Na3OBr are isostructural and form solid solutions with a miscibility gap χ = 0.28 to 0.62 as referred to Na3OBrx(NO2)1-x, at room temperature. Above 593 Κ formation of mixed crystals was observed for all compositions. In contrast to pure Na3O(NO2), the solid solutions do not undergo any phase transition in the investigated temperature range from 293 Κ to 130 K. These findings reveal that collective interactions between the dynamically disordered NO2--groups are involved in the phase transitions of Na3NO3.

A Simple Cryostat

1961 ◽  
Vol 14 (4) ◽  
pp. 527
Author(s):  
AS Buchanan ◽  
F Creutzberg
Keyword(s):  
Low Temperature ◽  
Room Temperature ◽  
Temperature Range

A simple all-glass cryostat, based on the LeRoy low-temperature fractionating column, is described. It can be used for the separation, purification, and the determination of vapour pressures of volatile and gaseous compounds in the temperature range -196 �C to room temperature. The vapour pressures of boron trimethyl have been remeasured and the reliability of Stock's data is confirmed.

Influence of the molecular structures on the high-pressure and low-temperature phase transitions of plastic crystals

2003 ◽  
Vol 59 (1) ◽  
pp. 60-71 ◽  
Author(s):  
Markus Wunschel ◽  
Robert E. Dinnebier ◽  
Stefan Carlson ◽  
Piotr Bernatowicz ◽  
Sander van Smaalen
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Low Temperature ◽  
Room Temperature ◽  
Close Packing ◽  
Molecular Structures ◽  
Temperature Phase ◽  
Plastic Crystals ◽  
First Order ◽  
First Order Phase

The crystal structures of tert-butyl-tris(trimethylsilyl)silane, Si[C(CH_3)_3]_1[Si(CH_3)_3]_3 (Bu1), and di-tert-butyl-bis(trimethylsilyl)silane, Si[C(CH_3)_3]_2[Si(CH_3)_3]_2 (Bu2), at room temperature and at 105 K have been determined by X-ray powder diffraction; the high-pressure behavior for pressures between 0 and 5 GPa is reported. The room-temperature structures have cubic Fm\bar{3}m symmetry (Z = 4) with a = 13.2645 (2) Å, V = 2333.87 (4) Å3 for Bu1 and a = 12.9673 (1) Å, V = 2180.46 (3) Å3 for Bu2. The molecules are arranged in a cubic close packing (c.c.p.) and exhibit at least 48-fold orientational disorder. Upon cooling both compounds undergo a first-order phase transition at temperatures T_c = 230 (5) K (Bu1) and T_c = 250 (5) K (Bu2) into monoclinic structures with space group P2_1/n. The structures at 105 K have a = 17.317 (1), b = 15.598 (1), c = 16.385 (1) Å, \gamma = 109.477 (4)°, V = 4172.7 (8) Å3 and Z = 8 for Bu1and a = 17.0089 (9), b = 15.3159 (8), c = 15.9325 (8) Å, \gamma = 110.343 (3)°, V = 3891.7 (5) Å3 and Z = 8 for Bu2. The severe disorder of the room-temperature phase is significantly decreased and only a two- or threefold rotational disorder of the molecules remains at 105 K. First-order phase transitions have been observed at pressures of 0.13–0.28 GPa for Bu1 and 0.20–0.24 GPa for Bu2. The high-pressure structures are isostructural to the low-temperature structures. The pressure dependencies of the unit-cell volumes were fitted with Vinet equations of state and the bulk moduli were obtained. At still higher pressures further anomalies in the pressure dependencies of the lattice parameters were observed. These anomalies are explained as additional disorder–order phase transitions.

THE EFFECT OF PRESSURE ON THE ELECTRICAL RESISTANCE OF RUBIDIUM

1957 ◽  
Vol 35 (6) ◽  
pp. 720-729 ◽  
Author(s):  
J. S. Dugdale ◽  
J. A. Hulbert
Keyword(s):  
Low Temperature ◽  
Electrical Resistance ◽  
Room Temperature ◽  
Residual Resistivity ◽  
Effect Of Pressure ◽  
Temperature Range ◽  
Fluid State

By using helium in both the solid and the fluid state as a pressure-transmitting medium, it has been possible to measure the resistance of rubidium over the temperature range from 2° K. to room temperature at pressures up to 2500 atmospheres. In particular the effect of pressure on the transition at ~200° K., on the low temperature ideal resistivity, and on the residual resistivity was examined.

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