scholarly journals Структура и электропроводность перовскитов Pr-=SUB=-1-x-=/SUB=-Sr-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=- (x=0; 0.15; 0.25)

2021 ◽  
Vol 63 (4) ◽  
pp. 465
Author(s):  
Л.Б. Ведмидь ◽  
О.М. Федорова ◽  
В.Б. Балакирева ◽  
В.А. Воротников ◽  
В.Ф. Балакирев
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Electrical Conductivity ◽  
Differential Thermal Analysis ◽  
Solid Phase ◽  
Phase Method ◽  
Solid Phase Method ◽  
Orthorhombic Perovskite ◽  
Semiconductor Character ◽  
Comprehensive Study

Pr1-xSrxMnO3 manganites (x=0; 0.15; 0.25) were synthesized by the solid-phase method at a temperature of 1250°C and have an orthorhombic perovskite-like structure (space group Pbnm). A comprehensive study of the effect of praseodymium substitution with strontium on the temperature features of the transformation of the crystal structure of the studied perovskites was performed using high-temperature radiography and differential thermal analysis. It was determined that the temperature of the Jahn-Тeller effect significantly decreases with the introduction of strontium. It is established that all samples have a semiconductor character of conductivity. Strontium doping significantly increases the electrical conductivity of praseodymium manganites, especially at temperatures below 450°C.

Preparation of La1-xSrxMnO3 Materials by High Temperature Solid Phase Method

2012 ◽  
Vol 562-564 ◽  
pp. 482-485
Author(s):  
Zeng Gang Li ◽  
Zeng Yong Chu ◽  
Yong Jiang Zhou ◽  
Hai Feng Cheng
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
High Temperature ◽  
Solid Phase ◽  
Average Particle Size ◽  
Phase Method ◽  
Average Particle ◽  
Structure And Morphology ◽  
Solid Phase Method ◽  
Perovskite Type

La1-xSrxMnO3 (LSMO) (x=0.1, 0.2, 0.3, 0.4)powders were synthesized by high temperature solid phase method, and the crystal structure and morphology were characterized by XRD and SEM. Results indicated that the pure perovskite type LSMO could be obtained after sintered at the temperature of 1000°C for 6h. The average particle size of the powders decreases with the increasing concentration of Strontium.

Peculiarities of a solid-phase method for the Al-Fe/SiO2 and Al-Co/SiO2 powder catalysts production

2019 ◽  
pp. 63-68
Author(s):  
V.A. Artyukh ◽  
◽  
V.N. Borsch ◽  
V.S. Yusupov ◽  
S.Ya. Zhuk ◽  
...  
Keyword(s):  
Solid Phase ◽  
Phase Method ◽  
Solid Phase Method ◽  
Sio2 Powder

Synthesis and biological activity of new metallocenic angiotensin II analogs

1988 ◽  
Vol 53 (11) ◽  
pp. 2914-2919 ◽  
Author(s):  
Pierrette Maes ◽  
Annie Ricouart ◽  
Emmanuel Escher ◽  
André Tartar ◽  
Christian Sergheraert
Keyword(s):  
Amino Acids ◽  
Biological Activity ◽  
Angiotensin Ii ◽  
Solid Phase ◽  
Rabbit Aorta ◽  
Phase Method ◽  
Solid Phase Method

Analogs of angiotensin II in which phenylalanine in position 8 was replaced with cymantrenylalanine or with its triphenylphosphine photosubstitution product were synthesized by the solid-phase method. On rabbit aorta strips, these peptides were found to be pure antagonists of angiotensin II. Their relative affinities are higher than most other analogs substituted in position 8 with bulky amino-acids.

Synthesis of four new V1 antagonists of arginine-vasopressin (AVP) containing new thioacids at position 1 and their vasoconstrictor activity towards isolated mesenteric arterial vessels of rats

1991 ◽  
Vol 56 (2) ◽  
pp. 491-498 ◽  
Author(s):  
Bernard Lammek ◽  
Izabela Derdowska ◽  
Tomasz M. Wierzba ◽  
Witold Juzwa
Keyword(s):  
Peptide Synthesis ◽  
Arginine Vasopressin ◽  
Solid Phase ◽  
Structural Features ◽  
Phase Method ◽  
Competitive Antagonist ◽  
Vasoconstrictor Effect ◽  
Solid Phase Method

In an attempt to determine some of the structural features in position 1 that account for V1 antagonism, four new analogues of arginine-vasopressin were synthesized and the effect of the modifications on the vasoconstrictor activity was checked using isolated mesenteric arterial vessels of rats. The protected precursors required for these analogues were synthesized by a solid phase method of peptide synthesis. One of the reported analogues, namely [1-(4-mercapto-4-tetrahydrothiopyraneacetic acid)., 2-O-methyltyrosine, 8-arginine]vasopressin appears to be a potent competitive antagonist of the vasoconstrictor effect by AVP.

Synthesis of a 21-Residue Fragment of Human Proinsulin by the Polyamide Solid Phase Method

1981 ◽  
Vol 362 (2) ◽  
pp. 833-840 ◽  
Author(s):  
Eric ATHERTON ◽  
Willy HÜBSCHER ◽  
Robert C. SHEPPARD ◽  
Vivienne WOOLLEY
Keyword(s):  
Solid Phase ◽  
Phase Method ◽  
Human Proinsulin ◽  
Solid Phase Method

scholarly journals Syntheses of two deacetyl-thymosin β4analogs and their anti-inflammatory effect on carrageenin-induced edema in the mouse paw

2001 ◽  
Vol 10 (2) ◽  
pp. 89-92 ◽  
Author(s):  
T. Abiko ◽  
R. Ogawa
Keyword(s):  
Marked Reduction ◽  
Solid Phase ◽  
The Other ◽  
Para Position ◽  
Phase Method ◽  
Antiinflammatory Effect ◽  
Solid Phase Method ◽  
Anti Inflammatory ◽  
Inflammatory Effect

Two {Met(0)6}deacetyl-thymosin β4analogs containing Phe(4F) or Tyr(Me) at position 12 were synthesized by the manual solid-phase method, and their anti-inflammatory effect on carrageenin-induced edema in the mouse paw was studied. Fluorination of the para-position of Phe12resulted in a marked antiinflammatory effect on carrageenin-induced edema in the mouse paw compared with that of our synthetic {Met(0)6}deacetyl-thymosin β4, but the other analog, {Met(0)6, Tyr(Me)12}deacetyl-thymosin β4, showed a marked reduction of the anti-inflammatory effect.

The Gas-Solid-Phase 2,5-Dioxopiperazine Synthesis. Cyclization of Vaporous Dipeptides on Silica Surface

1994 ◽  
Vol 59 (2) ◽  
pp. 461-466 ◽  
Author(s):  
Vladimir A. Basiuk ◽  
Taras Yu. Gromovoy
Keyword(s):  
Silica Surface ◽  
Solid Phase ◽  
Phase Method ◽  
Solid Phase Method

The "gas solid-phase" method is used for the preparation of both symmetric and asymmetric 2,5-dioxopiperazines via cyclization of vaporous linear dipeptides in the presence of silica.

Combustion Synthesis of La0.65Sr0.35MnO3 and its Sensing Properties for NO2

2016 ◽  
Vol 680 ◽  
pp. 208-211
Author(s):  
Lian Lian Wu ◽  
Qiang Li ◽  
Dan Yu Jiang ◽  
Jin Feng Xia
Keyword(s):  
Solid Phase ◽  
High Sensitivity ◽  
Combustion Method ◽  
Fast Response ◽  
Size Analysis ◽  
Phase Method ◽  
X Ray Diffraction ◽  
Ultrafine Structure ◽  
Nox Sensor ◽  
Solid Phase Method

In this paper, La0.65Sr0.35MnO3 (LSM) oxide powder with ultrafine structure has been synthesized by self-propagating combustion method. The powders were characterized by X-ray diffraction, scanning electron microscopy and laser size analysis. Compared to the powders prepared by traditional solid-phase method, the grain size of powders prepared by self-propagating combustion method is relatively small and uniform. Starting from ultrafine LSM powders, sensing electrode (SE) for NO2 mixed-potential sensors based on yttria-stablized zirconia (YSZ) was fabricated. As-obtained NO2 sensor displays fast response and high sensitivity (25.4mV/decade). The response values of the sensor have good linear relationship with the logarithm of NO2 concentration varying from 30ppm to 500ppm.Keywords:Self-propagating combustion method; La0.65Sr0.35MnO3; NOx sensor; YSZ

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