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Mostrando 301 - 320 Resultados de 2,617 Para Buscar '"reaction rate"', tiempo de consulta: 0.35s Limitar resultados
  1. 301
    “…Despite its application in asymmetric reduction, which prompted several engineering attempts of this enzyme, the order of chemical events in the active site, their contributions to limit the reaction rate, and interactions between the enzyme and non-native 3-oxocarboxylates have not been explored. …”
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  2. 302
    “…The measured and calculated rate coefficients are in good agreement, which enables us to attribute the observed reduction of the reaction rate at low collision energies to the negative quadrupole moment, Q(zz), of the N(2) molecules. …”
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  3. 303
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  5. 305
    “…Nine free radical species (hydroxyl, superoxide anion, ascorbyl, tert-butyl peroxyl, tert-butoxyl, singlet oxygen, 2,2-diphenyl-1-picrylhydrazyl, nitric oxide, and tyrosyl radicals) were directly quantified using an X-band ESR spectrometer with the spin-trapping method. IC(50) and reaction rate constants were estimated from the dose-response curve for each free radical. …”
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  6. 306
    “…It was found that the fastest depolymerization is reached using methanol as anucleophile for the reaction with PLA, resulting in the value of reaction rate constant (k) of 0.0425 min(−1) and the yield of methyl lactate of 93.8% after 120 min. …”
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  7. 307
    por Wanzenberg, R, Zorzano-Mier, M P
    Publicado 2000
    “…We propose Intra Beam Scattering as a possible physical mechanism for creating the coasting beam and discuss the implications of this longitudinal dynamics model on observables such as the bunch length, energy spread, dc current and reaction rate at the HERA-B wires. The results seem to be in qualitative agreement with the measurements.…”
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  8. 308
    por CERN. Geneva
    Publicado 2001
    “…We calculated the change of the triple-alpha reaction rate in a microscopic twelve-nucleon model of the 12C nucleus and looked for the effects of minimal variations of the strengths of the underlying strong and Coulomb interactions. …”
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  9. 309
    por Kamimura, Akio, Toyoshima, Seiichi
    Publicado 2012
    “…The reactions progress smoothly and recovered ionic liquids can be used for several iterations, as long as they are washed with water to remove alkali metallic salts. The reaction rate is slower than the corresponding S(RN)1 reaction in DMSO, but no acceleration on irradiation or no inhibition in the presence of m-DNB are observed.…”
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  10. 310
    “…We mainly discuss the advantages of this medium when the recyclability is demonstrated and when the water can control the selectivity of a reaction or enhance the reaction rate.…”
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  11. 311
    “…Since long ago, chemists have studied how structural (bioinspired) modifications can improve the antioxidant activity of these compounds in terms of reaction rate with radical reactive oxygen species (ROS), catalytic character, multi-defence action, hydrophilicity/lipophilicity, biodistribution etc. …”
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  12. 312
    “…We demonstrate that the positive miscut influence can increase the nuclear reaction rate in the perfectly aligned crystal collimator by a factor of 4.5. …”
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  13. 313
    “…Ultrasound was proved to be very helpful to the reaction, markedly improving the yield and the reaction rate.…”
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  14. 314
    “…Nowadays, microwave chemistry is a mature technology that has been well demonstrated in many cases with numerous advantages in terms of the reaction rate and yield. The strategies toward scaling up find an ally in continuous-flow reactor technology comparing dielectric and conductive heating.…”
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  15. 315
    “…Although aniline was formed when any saccharide was used, the use of disaccharides (lactose, maltose, and sucrose) decreased the reaction rate. The rate of photocatalytic hydrogenation of nitrobenzene using saccharides is determined by the degradation rate of saccharides at positive holes. …”
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  16. 316
    “…Chl a, Chl b, total chlorophyll content, Chl a/b ratio, carotenoids content, Hill reaction rate, and chlorophyll fl uorescence didn’t show a signifi cant diff erence between TRR14 and WT plants. …”
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  17. 317
  18. 318
    “…However, there was no significant difference in open surgery rate, postoperative exhaust time, adverse reaction rate, local recurrence rate or incision tumor implantation rate between the two groups (all P>0.05). …”
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  19. 319
    “…In summary, this work provides key insights explaining why absence of substrate channeling can dramatically slow down enzyme reaction rate in crowded metabolically active spaces.…”
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  20. 320
    “…We found that KTBAMs had a significantly higher total effective rate (P < 0.00001, risk ratio (RR) = 1.08, confidence interval (CI) = 1.05 to 1.11, I(2) = 4%) and a lower gastrointestinal adverse reaction rate (P < 0.00001, RR = 0.36, CI = 0.24 to 0.53, I(2) = 33%) than NSAIDs. …”
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