Upgrade Mechanoluminescence by Sr2+ Substitution in CaAl2Si2O8: Eu2+

2009 ◽  
Vol 421-422 ◽  
pp. 315-318 ◽  
Author(s):  
Lin Zhang ◽  
Chao Nan Xu ◽  
Hiroshi Yamada ◽  
Nan Bu
Keyword(s):  
Cell Volume ◽  
Short Wavelength ◽  
Volume Expansion ◽  
Emission Peak ◽  
Xrd Pattern ◽  
The One ◽  
Lower Angle

Recently we demonstrated that CaAl2Si2O8: Eu2+ showed novel strong mechanoluminescence (ML). In order to improve the mechanoluminescence intensity, we partly substituted the Ca2+ ions by Sr2+ ions. It was found that the ML intensity was enhanced about three times as great as the one of CaAl2Si2O8: Eu2+ by substituting 40% of Ca2+ ions to Sr2+ ions. Furthermore it was revealed that the main peaks in XRD pattern shifted to lower angle side and the emission peak shifted to a short wavelength from 428 to 418 nm, indicating that the substitution resulted in the cell volume expansion and the change of luminescent color. Based on the results of thermoluminescence and electroluminescence measurements, the possible mechanisms for the improvement of ML intensity were proposed.

Liver cell hydration and integrin signaling

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Michele Bonus ◽  
Dieter Häussinger ◽  
Holger Gohlke
Keyword(s):  
Cell Volume ◽  
Liver Cell ◽  
Cell Function ◽  
The Other ◽  
Signaling Cascades ◽  
Integrin Signaling ◽  
Volume Changes ◽  
The One ◽  
And Oxidative Stress

Abstract Liver cell hydration (cell volume) is dynamic and can change within minutes under the influence of hormones, nutrients, and oxidative stress. Such volume changes were identified as a novel and important modulator of cell function. It provides an early example for the interaction between a physical parameter (cell volume) on the one hand and metabolism, transport, and gene expression on the other. Such events involve mechanotransduction (osmosensing) which triggers signaling cascades towards liver function (osmosignaling). This article reviews our own work on this topic with emphasis on the role of β1 integrins as (osmo-)mechanosensors in the liver, but also on their role in bile acid signaling.

On the unit cell volume expansion in homogeneous series of isotypic structures of “ionic” inorganic compounds

2016 ◽  
Vol 231 (12) ◽  
Author(s):  
Egbert Keller
Keyword(s):  
Cell Volume ◽  
Volume Expansion ◽  
Chemical Element ◽  
Unit Cell Volume ◽  
Inorganic Compounds ◽  
Unit Cell

AbstractWithin a “homogeneous” series of (crystal-chemically) isotypic structures one and only one chemical element

scholarly journals Red Cell Volume Expansion at Altitude

2013 ◽  
Vol 45 (9) ◽  
pp. 1767-1772 ◽  
Author(s):  
PETER RASMUSSEN ◽  
CHRISTOPH SIEBENMANN ◽  
VÍCTOR DÍAZ ◽  
CARSTEN LUNDBY
Keyword(s):  
Cell Volume ◽  
Volume Expansion ◽  
Red Cell ◽  
Red Cell Volume

scholarly journals The Response of Duck Erythrocytes to Hypertonic Media

1971 ◽  
Vol 58 (4) ◽  
pp. 396-412 ◽  
Author(s):  
Floyd M. Kregenow
Keyword(s):  
Cell Volume ◽  
Cell Size ◽  
Hypertonic Solution ◽  
Electrochemical Gradient ◽  
Cell Content ◽  
Bathing Medium ◽  
Instantaneous Phase ◽  
Controlling Mechanism ◽  
Pump Mechanism ◽  
The One

The addition of a hypertonic bathing medium to duck erythrocytes results in an initial instantaneous phase of osmotic shrinkage and, when the [K]o of the hypertonic solution is larger than "normal," in a second, more prolonged phase, the volume regulatory phase. During the latter, which also requires extracellular Na, the cells swell until they approach their initial isotonic volume. The increase in cell volume during the volume regulatory phase is accomplished by a gain in the cell content of K, Cl, and H2O. There is also a smaller increase in the Na content of the cell. Potassium is accumulated against an electrochemical gradient and is therefore actively transported into the cell. This accumulation is associated with an increase, although dissimilar, in both K influx and efflux. Changes in cell size during the volume regulatory phase are not altered by 10-4 M ouabain, although this concentration of ouabain does change the cellular cation content. The response is independent of any effect of norepinephrine. The changes in cell size during the volume regulatory phase are discussed as the product of a volume controlling mechanism identical in principle to the one reported in the previous paper which controls cell volume in hypotonic media. Similarly, this mechanism can regulate cell size, when the Na-K exchange, ouabain-inhibitable pump mechanism is blocked.

scholarly journals Chemistry and Mechanism of One-Step Formation of Graphene from Agrowaste

2020 ◽  
Vol 9 (3) ◽  
pp. 1389-1394
Keyword(s):  
Sugarcane Bagasse ◽  
High Performance ◽  
Graphene Nanosheets ◽  
Atmospheric Condition ◽  
Single Step ◽  
Xrd Pattern ◽  
Graphene Derivatives ◽  
One Step ◽  
The One ◽  
First Time

The one-step synthesis of high-quality graphene derivatives via CVD process has gained considerable importance nowadays for high-performance electronics and sensors. However, the use of harsh chemicals, high temperature, sensitivity, and the problem of separation of graphene from the substrate, motivated the one-step synthesis of graphene from a non-graphitic precursor, bypassing the use of graphite. In this paper, we have reported for the first time, the synthesis of graphene nanosheets from sugarcane bagasse at the normal atmospheric condition in a single step, avoiding the formation of GO. Here, the pyrolysis of sugarcane bagasse was carried out in the temperature range of 250-450o C in the presence of sodium hydroxide. The results suggested that even the low temperature (250–450o C) facilitated the development of graphitic planes via condensation and aromatization of the glucose monomers present in the precursor. The XRD pattern showed 2θ at around 25o in each case, which confirmed the formation of graphene instead of GO. The FESEM, TEM, and EDX analysis proved the formation of few-layer nanosheets of graphene from carbon-rich waste precursors in a single step.

scholarly journals Engineered Pericellular Matrix Deposition Controls Mesenchymal Stromal Cell Volume Expansion and Fate

2020 ◽  
Vol 118 (3) ◽  
pp. 602a-603a
Author(s):  
Sing-Wan Wong ◽  
Raymond Bargi ◽  
Celine Macaraniag ◽  
Zhangli Peng ◽  
Jae-Won Shin
Keyword(s):  
Cell Volume ◽  
Mesenchymal Stromal Cell ◽  
Volume Expansion ◽  
Stromal Cell ◽  
Pericellular Matrix ◽  
Matrix Deposition

Structure and Properties of Graphene Oxide Aerogels by Freeze-Drying Process

2020 ◽  
Vol 862 ◽  
pp. 78-82
Author(s):  
Ren Lon Zhang ◽  
Jean Hong Chen ◽  
Lung Chuan Chen ◽  
Hao Lin Hsu ◽  
Jun Ku Lin
Keyword(s):  
Graphene Oxide ◽  
Graphite Powder ◽  
Order Structure ◽  
Structure And Properties ◽  
Drying Process ◽  
Sem Images ◽  
Xrd Pattern ◽  
Lamellar Layer ◽  
The One ◽  
Modified Hummers Method

The structure and properties of graphene oxide aerogels (GOA), prepared by a modified Hummer’s method followed by a freezing-drying process in addition to a pre-oxidized procedure, were studied through FTIR, Raman, SEM and XDR techniques. FTIR results indicated the existence of -C-O, -C-OH and -C=O function groups on the GOA surface. Therefore, the D band intensity of GOA sample exhibited remarkable increasing in the Raman spectra compared with of graphite; it may be due to change the order-structure of graphite to disorder-structure of GOA. The diffractive peak for the graphite at 2θ of 26.5° vanishes instead the one around 10.0° occurred in the XRD pattern for the GOA supported that the structure and d-spacing changed seriously from graphite to GOA. The SEM images revealed that the micro-structure of graphene layer of GOA was wrinkler and softer than that of graphite, however, the former involved fewer lamellar layer appearance with wrinkles on the edges of the graphene. All the characterized evaluation confirmed that the graphite powder has been transformed into a GOA structure through the modified Hummers’ method.

scholarly journals Defect‐fluorite Gd 2 Zr 2 O 7 ceramics under helium irradiation: Amorphization, cell volume expansion, and multi‐stage bubble formation

2019 ◽  
Vol 102 (8) ◽  
pp. 4911-4918 ◽  
Author(s):  
Zhangyi Huang ◽  
Nannan Ma ◽  
Jianqi Qi ◽  
Xiaofeng Guo ◽  
Mao Yang ◽  
...  
Keyword(s):  
Cell Volume ◽  
Volume Expansion ◽  
Bubble Formation ◽  
Multi Stage

Antofagastaite, Na2Ca(SO4)2·1.5H2O, a new mineral related to syngenite

2019 ◽  
Vol 83 (6) ◽  
pp. 781-790
Author(s):  
Igor V. Pekov ◽  
Vadim M. Kovrugin ◽  
Oleg I. Siidra ◽  
Nikita V. Chukanov ◽  
Dmitry I. Belakovskiy ◽  
...  
Keyword(s):  
Crystal Structure ◽  
New Mineral ◽  
Formula Unit ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Quartz Veins ◽  
Tolbachik Volcano ◽  
Mohs Hardness ◽  
The One

AbstractThe new mineral antofagastaite, ideally Na2Ca(SO4)2·1.5H2O, was found in the oxidation zone of sulfide–quartz veins at the abandoned Coronel Manuel Rodríguez mine, Mejillones, Antofagasta Province, Antofagasta Region, Chile. It is associated with sideronatrite, metasideronatrite, aubertite, gypsum, ferrinatrite, glauberite, amarillite and an unidentified Fe phosphate. Antofagastaite occurs as prismatic crystals up to 0.5 mm × 1 mm × 5 mm, elongated along [010], typically combined in open-work aggregates up to 1 cm across. Antofagastaite is transparent and colourless, with vitreous lustre. It is brittle; the Mohs’ hardness isca3. Cleavage is distinct on (001).Dmeas.is 2.42(1) andDcalc.is 2.465 g cm−3. Antofagastaite is optically biaxial (–), α = 1.489(2), β = 1.508(2), γ = 1.510(2) and 2Vmeas.= 40(10)°. The IR spectrum is reported. Chemical composition (wt.%, electron microprobe, H2O determined by gas chromatography) is: Na2O 20.85, CaO 17.42, SO352.56, H2O 7.93, total 98.76. The empirical formula (based on 8 O atoms belonging to sulfate anions per formula unit with all H belonging to H2O molecules) is Na2.06Ca0.95S2.01O8·1.35H2O. Antofagastaite is monoclinic,P21/m,a= 6.4596(4),b= 6.8703(5),c= 9.4685(7) Å, β = 104.580(4)°,V= 406.67(5) Å3andZ= 2. The strongest reflections of the powder XRD pattern [d, Å (I, %) (hkl)] are: 9.17 (100) (001), 5.501 (57) (011), 3.437 (59) (020), 3.058 (43) (003), 2.918 (50) (2¯11), 2.795 (35) (013) and 2.753 (50) (121, 201). The crystal structure was solved based on single-crystal X-ray diffraction data,R1= 5.71%. The structure of antofagastaite consists of ordered and disordered blocks and is related to syngenite K2Ca(SO4)2·H2O. Incorporation of additional H2O molecules in the syngenite-type structure results in disorder of the one of the two tetrahedral sulfate groups occurring in antofagastaite. In addition to the above-reported type material, antofagastaite together with syngenite and blödite occurs in the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia.

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