Cubic Phase Prepared in an Anionic/Amphoteric Surfactant/Oleic Acid/Decane/Water System and the Relationship with the Neighboring Phase

Langmuir ◽  
2004 ◽  
Vol 20 (7) ◽  
pp. 2607-2613 ◽  
Author(s):  
Kei Watanabe ◽  
Yasunari Nakama ◽  
Toshio Yanaki ◽  
Christine Thunig ◽  
Klaus Horbachek ◽  
...  

Langmuir ◽  
2001 ◽  
Vol 17 (23) ◽  
pp. 7219-7224 ◽  
Author(s):  
Kei Watanabe ◽  
Yasunari Nakama ◽  
Toshio Yanaki ◽  
Heinz Hoffmann


Heliyon ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. e06420
Author(s):  
Caroline Azevedo Martins ◽  
Maria Conceição B dos Santos ◽  
Cassiano Felippe Gonçalves-de-Albuquerque ◽  
Hugo Caire Castro-Faria-Neto ◽  
Mauro Velho Castro-Faria ◽  
...  




Author(s):  
Dora P. Crouch

To get a sense of the relationship between karst geology and Greek settlement, we will look at examples from the Greek mainland, the islands of the Aegean, and Sicily. There is no attempt here to be comprehensive, as the necessary field work has not been done to make that possible, but rather these examples are selected to suggest the way that karst water potential played an important role in site selection and development. The major examples selected are Athens and Corinth for mainland Greece, Rhodes for the Aegean Islands, Assos and Priene for Ionia, and Syracuse and Akragas for Sicily. Other places will be cited briefly if the details from those sites are particularly illuminating. Karst phenomena, as we have seen, are found throughout the Greek world. Since Athens is perhaps the best documented Greek city, and has in addition a phenomenal karst system as its monumental focus, it receives here a section of its own, Chapter 18, The Well-Watered Acropolis. In Chapter 11, Planning Water Management, we discuss Corinth’s water system in comparison with that of her daughter city Syracuse. Here, however, we will consider the aspects of water at Corinth that derive from the karst geology of the area. This city is an excellent example of the adaptation of urban requirements to karst terrane, the siting of an ancient Greek city to take advantage of this natural resource. Ancient Corinth was built on gradually sloping terraces below the isolated protuberance of Acrocorinth, which acts as a reservoir, with the flow of waters through it resulting in springs (Fig. 8.1). That karst waters are to be found in perched nappes even at high altitudes accounts for the spring of Upper Peirene not far below the summit of Acrocorinth, as well as the two fountains half-way down the road from its citadel, and the fountain called Hadji Mustapha, at the immediate foot of the citadel (as reported by the late seventeenth century traveler, E. Celebi, cited in Mackay, 1967, 193–95.) The aquifers also supply the aqueduct (probably ancient) from Penteskouphia southwest of Acrocorinth.



2020 ◽  
Vol 852 ◽  
pp. 119-128
Author(s):  
Liang Zhao ◽  
Qian Huang ◽  
Hua Yin Sun ◽  
Xiang Li

Partially stabilized zirconia (PSZ) materials were fabricated using 4 wt% CaO, 3 wt% MgO, and 5.4 wt% Y2O3 as stabilizing agents together with monoclinic zirconia powder. The physical properties, phase compositions, and microstructures of the Ca-PSZ, Mg-PSZ, and Y-PSZ samples were investigated by X-ray diffraction, scanning electron microscopy, and energy spectrum analysis. A crucible method was used to explore the relationship between the stabilizing agent and erosion resistance to alkaline steel slag. The results revealed that the zirconia materials stabilized by different stabilizing agents showed obvious differences in their bulk densities, apparent porosities, microstructures, and erosion resistances to alkaline steel slag. The structure of Y-PSZ showed highest density, containing a small number of uniformly distributed pores. In terms of Mg-PSZ, the intergranular bonding in its structure was observed to not be close, and the sample contained some cracks, but no pores. A large number of intragranular pores and a small number of overall pores was observed in Ca-PSZ, resulting in this material having the lowest bulk density. The pores and cracks provide the path to penetrate and diffuse for alkaline steel slag, which weakens the corrosion resistance of PSZ materials. The phase composition of the affected layers in all of the samples after corrosion was almost completely transformed from monoclinic phase to cubic phase, and the phase transition of both the original and transition layers was not obvious due to the formation of a slag film. Y-PSZ did not react with components of the steel slag such as SiO2 and Al2O3, showing the best corrosion resistance to alkaline steel slag.



2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Kentaro Ihara ◽  
Masakatsu Hato ◽  
Takanori Nakane ◽  
Keitaro Yamashita ◽  
Tomomi Kimura-Someya ◽  
...  

Abstract In meso crystallization of membrane proteins relies on the use of lipids capable of forming a lipidic cubic phase (LCP). However, almost all previous crystallization trials have used monoacylglycerols, with 1-(cis-9-octadecanoyl)-rac-glycerol (MO) being the most widely used lipid. We now report that EROCOC17+4 mixed with 10% (w/w) cholesterol (Fig. 1) serves as a new matrix for crystallization and a crystal delivery medium in the serial femtosecond crystallography of Adenosine A2A receptor (A2AR). The structures of EROCOC17+4-matrix grown A2AR crystals were determined at 2.0 Å resolution by serial synchrotron rotation crystallography at a cryogenic temperature, and at 1.8 Å by LCP-serial femtosecond crystallography, using an X-ray free-electron laser at 4 and 20 °C sample temperatures, and are comparable to the structure of the MO-matrix grown A2AR crystal (PDB ID: 4EIY). Moreover, X-ray scattering measurements indicated that the EROCOC17+4/water system did not form the crystalline LC phase at least down to − 20 °C, in marked contrast to the equilibrium MO/water system, which transforms into the crystalline LC phase below about 17 °C. As the LC phase formation within the LCP-matrix causes difficulties in protein crystallography experiments in meso, this feature of EROCOC17+4 will expand the utility of the in meso method.



Nutrients ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 315 ◽  
Author(s):  
Giorgia Sollai ◽  
Melania Melis ◽  
Mariano Mastinu ◽  
Danilo Pani ◽  
Piero Cosseddu ◽  
...  

The perception of fat varies among individuals and has also been associated with CD36 rs1761667 polymorphism and genetic ability to perceive oral marker 6-n-propylthiouracil (PROP). Nevertheless, data in the literature are controversial. We present direct measures for the activation of the peripheral taste system in response to oleic acid by electrophysiological recordings from the tongue of 35 volunteers classified for PROP taster status and genotyped for CD36. The waveform of biopotentials was analyzed and values of amplitude and rate of potential variation were measured. Oleic acid stimulations evoked positive monophasic potentials, which represent the summated voltage change consequent to the response of the stimulated taste cells. Bio-electrical measurements were fully consistent with the perceived intensity during stimulation, which was verbally reported by the volunteers. ANOVA revealed that the amplitude of signals was directly associated, mostly in the last part of the response, with the CD36 genotypes and PROP taster status (which was directly associated with the density of papillae). The rate of potential variation was associated only with CD36, primarily in the first part of the response. In conclusion, our results provide direct evidence of the relationship between fat perception and rs1761667 polymorphism of the CD36 gene and PROP phenotype.



2016 ◽  
Vol 15 (1) ◽  
Author(s):  
Mychelle Kytchia Rodrigues Nunes Duarte ◽  
Jéssica Nayara Góes de Araújo ◽  
Victor Hugo Rezende Duarte ◽  
Katiene Macêdo de Oliveira ◽  
Juliana Marinho de Oliveira ◽  
...  


Sign in / Sign up

Export Citation Format

Share Document