scholarly journals High NH3-SCR reaction rate with low dependence on O2 partial pressure over Al-rich Cu–*BEA zeolite

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 10381-10384
Author(s):  
Yusuke Ohata ◽  
Takeshi Ohnishi ◽  
Takahiko Moteki ◽  
Masaru Ogura
Keyword(s):  
Partial Pressure ◽  
Reaction Rate ◽  
Reaction Condition ◽  
Bea Zeolite ◽  
Nh3 Scr ◽  
High Reaction ◽  
O2 Partial Pressure ◽  
Zeolite P ◽  
High Reaction Rate

It was revealed that Al-rich Cu–*BEA zeolite exhibit high reaction rate for NH3-SCR at 473 K in low PO2 reaction condition.

Closed Loop Controlled ER-Actuator

1996 ◽  
Vol 10 (23n24) ◽  
pp. 2867-2876 ◽  
Author(s):  
C. WOLFF
Keyword(s):  
Reaction Rate ◽  
Closed Loop ◽  
Dynamic Behaviour ◽  
Volume Flow ◽  
Hydraulic Systems ◽  
High Reaction ◽  
Er Fluids ◽  
High Reaction Rate

The results of the investigation regarding the suitability of ERF when applied in hydraulics have shown so far that constructing electrorheological flow resistors for the control of pressure and volume flow is possible in principle. One of the main advantages when using the ER-technology in hydraulic systems can be seen in the high reaction rate of the ER-effect. The investigations presented in this article document the dynamic qualities of ER-fluids by means of a practical exploitation for the control of a cylinder actuator. Due to the particular possibilities for design of ER-control resistors a compact cylinder has resulted which differs considerably from traditional cylinder actuators in its construction and dynamic behaviour.

scholarly journals Green synthesis of Au nanoparticles using an aqueous extract ofStachys lavandulifoliaand their catalytic performance for alkyne/aldehyde/amine A3coupling reactions

RSC Advances ◽  
2018 ◽  
Vol 8 (67) ◽  
pp. 38186-38195 ◽  
Author(s):  
Hojat Veisi ◽  
Maliheh Farokhi ◽  
Mona Hamelian ◽  
Saba Hemmati
Keyword(s):  
Green Synthesis ◽  
Metal Nanoparticles ◽  
Aqueous Extract ◽  
Reaction Rate ◽  
Au Nanoparticles ◽  
Catalytic Performance ◽  
High Reaction ◽  
High Reaction Rate

High reaction rate and easy availability make green synthesis of metal nanoparticles noticeable.

Catalytic antibody light chain capable of cleaving a chemokine receptor CCR-5 peptide with a high reaction rate constant

2004 ◽  
Vol 86 (2) ◽  
pp. 217-225 ◽  
Author(s):  
Yukie Mitsuda ◽  
Emi Hifumi ◽  
Kumi Tsuruhata ◽  
Hiroko Fujinami ◽  
Naoki Yamamoto ◽  
...  
Keyword(s):  
Rate Constant ◽  
Chemokine Receptor ◽  
Light Chain ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Catalytic Antibody ◽  
High Reaction ◽  
High Reaction Rate

Reproducible preparation of Au/TS-1 with high reaction rate for gas phase epoxidation of propylene

2012 ◽  
Vol 287 ◽  
pp. 178-189 ◽  
Author(s):  
Wen-Sheng Lee ◽  
M. Cem Akatay ◽  
Eric A. Stach ◽  
Fabio H. Ribeiro ◽  
W. Nicholas Delgass
Keyword(s):  
Gas Phase ◽  
Reaction Rate ◽  
Epoxidation Of Propylene ◽  
High Reaction ◽  
High Reaction Rate

Effect of hypoxia and CO on a cytochrome P-450-mediated reaction in rabbit lungs

1981 ◽  
Vol 51 (6) ◽  
pp. 1635-1642 ◽  
Author(s):  
A. Knoblauch ◽  
A. Sybert ◽  
N. J. Brennan ◽  
J. T. Sylvester ◽  
G. H. Gurtner
Keyword(s):  
Partial Pressure ◽  
Reaction Rate ◽  
Component Model ◽  
High Affinity ◽  
O2 Partial Pressure ◽  
Tissue Po2 ◽  
Two Component ◽  
Carrier Molecule ◽  
The Relationship ◽  
Cytochrome P 450

Evidence indicates that the diffusion of O2 and CO in tissue may be facilitated by a carrier molecule having a P50 that approximates tissue O2 partial pressure (PO2; 1–15 Torr) and a much higher affinity for CO than for O2. To determine whether cytochrome P-450 in lung satisfies these criteria, we measured the effect of hypoxia and of CO on the rate of metabolism of the cytochrome P-450 mediated O-demethylation of p-nitroanisole in isolated perfused rabbit lungs. Metabolism was inhibited by 50% of a control at an estimated tissue PO2 fo 4 Torr (5.5 microM). When inspired CO2 was kept at 200 Torr and inspired CO partial pressure (PCO) varied an estimated tissue PCO/PO2 ratio of 0.025 reduced the reaction rate by 50% of control, but some metabolism persisted at PCO/PO2 ratios larger than one. The relationship between reaction rate and PCO/PO2 ratio could not be fit by a single value for Haldane constant for M (CO affinity/O2 affinity) but could be described with a two-component model in which metabolism was equally divided between a high-affinity cytochrome (M = 200) and a low-affinity cytochrome (M = 2). These findings suggest that cytochrome P-450 could act as a carrier for O2 and CO in tissue with low PO2's.

A ruthenium-based plasmonic hybrid photocatalyst for aqueous carbon dioxide conversion with a high reaction rate and selectivity

2019 ◽  
Vol 7 (29) ◽  
pp. 17254-17260 ◽  
Author(s):  
Hwiseok Jun ◽  
Shinyoung Choi ◽  
Moon Young Yang ◽  
Yoon Sung Nam
Keyword(s):  
Carbon Dioxide ◽  
Formic Acid ◽  
Reaction Rate ◽  
Ruthenium Complex ◽  
Low Ph ◽  
Carbon Dioxide Conversion ◽  
High Reaction ◽  
Hybrid Photocatalyst ◽  
High Reaction Rate

A cis-ruthenium complex fixed on a plasmonic Au/TiO2 nanostructure efficiently converts CO2 into formic acid even in low pH water.

scholarly journals Photobiocatalytic Oxyfunctionalization with High Reaction Rate using a Baeyer–Villiger Monooxygenase from Burkholderia xenovorans in Metabolically Engineered Cyanobacteria

ACS Catalysis ◽  
2021 ◽  
pp. 66-72
Author(s):  
Elif Erdem ◽  
Lenny Malihan-Yap ◽  
Leen Assil-Companioni ◽  
Hanna Grimm ◽  
Giovanni Davide Barone ◽  
...  
Keyword(s):  
Reaction Rate ◽  
Burkholderia Xenovorans ◽  
High Reaction ◽  
High Reaction Rate

scholarly journals Sequential deiodination of thyroxine in rat liver homogenate

1978 ◽  
Vol 174 (1) ◽  
pp. 221-229 ◽  
Author(s):  
T J Visser ◽  
D Fekkes ◽  
R Docter ◽  
G Hennemann
Keyword(s):  
Rat Liver ◽  
Reaction Rate ◽  
Liver Homogenate ◽  
Ph Optimum ◽  
High Reaction ◽  
High Reaction Rate

Rat liver homogenate was incubated at 37 degrees C with thyroxine, 3,3′,5-tri-iodothyronine, 3,3′,5′-tri-iodothyronine or 3,3′-di-iodothyronine. The degradation or accumulation of these compounds was measured by specific radioimmunoassays. (1) Production of 3,3′,5-tri-iodothyronine from thyroxine was highest at pH 6.0–6.5 and was markedly stimulated by the addition of dithiothreitol and effectively inhibited in the presence of 6-propyl-2-thiouracil. (2) Accumulation of 3,3′,5′-tri-iodothyronine on incubation of thyroxine with homogenate was only observed above pH 8.5. Otherwise the product was converted into 3,3′-di-iodothyronine too rapidly to allow its measurement. By measuring 3,3′-di-iodothyronine it was deduced that 5-deiodination of thyroxine was most effective at approx. pH 8.0. Dithiothreitol powerfully stimulated this reaction and 6-propyl-2-thiouracil strongly inhibited. (3) Monodeiodination of the tyrosine ring of 3,3′,5-tri-iodothyronine was the slowest reaction, was optimal at pH 8.0 and was less affected by dithiothreitol and 6-propyl-2-thiouracil than the above reactions. (4) 5′-Deiodination of 3,3′,5′-tri-iodothyronine was extremely rapid, with a pH optimum probably at about 6.5. Owing to the high reaction rate under the conditions used it was not possible to assess the effects of dithiothreitol and 6-propyl-2-thiouracil.

Separation of carotid body chemoreceptor responses to O2 and CO2 by oligomycin and by antimycin A

1982 ◽  
Vol 242 (3) ◽  
pp. C200-C206 ◽  
Author(s):  
E. Mulligan ◽  
S. Lahiri
Keyword(s):  
Steady State ◽  
Carbonic Anhydrase ◽  
Partial Pressure ◽  
Carotid Body ◽  
Body Tissue ◽  
Antimycin A ◽  
Tissue Ph ◽  
Co2 Partial Pressure ◽  
O2 Partial Pressure ◽  
Metabolic Hypothesis

The cat carotid chemoreceptor O2 and CO2 responses can be separated by oligomycin and by antimycin A. Both of these agents greatly diminish or abolish the chemoreceptor O2 response but not the nicotine or CO2 responses. After either oligomycin or antimycin, the responses to increases and decreases in arterial CO2 partial pressure (PaCO2) consisted of increases and decreases in activity characterized respectively by exaggerated overshoots and undershoots. These were eliminated by the carbonic anhydrase inhibitor, acetazolamide, suggesting that they resulted from changes in carotid body tissue pH. The steady-state PaCO2 response remaining after oligomycin was no longer dependent on arterial O2 partial pressure (PaO2). All effects of antimycin were readily reversible in about 20 min. The separation of the responses to O2 and CO2 indicates that there may be at least partially separate pathways of chemoreception for these two stimuli. The similarity of the oligomycin and antimycin results supports the metabolic hypothesis of chemoreception.

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