Log in

Relevant bibliographies by topics / Second order rate constant / Journal articles

To see the other types of publications on this topic, follow the link: Second order rate constant.

Journal articles on the topic 'Second order rate constant'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Second order rate constant.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Paventi, Martino. "Particular solution for any consecutive second-order reaction." Canadian Journal of Chemistry 65, no. 8 (1987): 1987–94. http://dx.doi.org/10.1139/v87-329.

Full text

Abstract:

Arguments are presented against the accepted notion that multiple rate constants may be obtained from observed singular or pooled kinetic runs. For any competitive consecutive second-order reaction, the particular solution satisfying the total differential equation, derived from (n + 1) simultaneous differential equations, is S = (aA0 − S0){(aA0/S0)[exp (aA0 − S0)kt] − 1}−1, where S is the concentration of reactant common for all the steps, A is the concentration of the substrate with a reactive sites, A0 and S0 are the concentration of reactants at zero time, k is the observed rate constant,

APA, Harvard, Vancouver, ISO, and other styles

2

Rigas, Fotis P. "Derivation of rate constant ratios for consecutive second‐order irreversible reactions." International Journal of Chemical Kinetics 53, no. 1 (2020): 7–15. http://dx.doi.org/10.1002/kin.21418.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Liochev, Stefan I., and Irwin Fridovich. "Second order rate constants: a cautionary note." Free Radical Biology and Medicine 35, no. 7 (2003): 833. http://dx.doi.org/10.1016/s0891-5849(03)00393-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

H., C. MALHOTRA, and S. JASSAL P. "Kinetics of Acid-cataiysed Resorcinol-Formaldehyde Reaction." Journal of Indian Chemical Society Vol. 62, Sep 1985 (1985): 657–61. https://doi.org/10.5281/zenodo.6322157.

Full text

Abstract:

Department of Chemistry, University of Delhi, Delhi-110 007 <em>Manuscript received 12 July 1984, revised 22 April 1985, accepted 11 September 1985</em> A kinetic study of the reaction of resorcinol with formaldehyde has been carried out at temperatures 65, 70, 75 and 80° using hydrochloric acid as catalyst. The <em>p</em>H was maintained at 2.15, 2.38, 2.75 and 3.20. The rate is found to increase with the decrease in <em>p</em>H of the reaction. The reaction follows an overall second order rate kinetics. The overall rate constant has been resolved Into the <em>step </em>rate constants. Th

APA, Harvard, Vancouver, ISO, and other styles

5

Ho, Y. S., and G. McKay. "Kinetic Model for Lead(II) Sorption on to Peat." Adsorption Science & Technology 16, no. 4 (1998): 243–55. http://dx.doi.org/10.1177/026361749801600401.

Full text

Abstract:

The kinetics of lead sorption on to peat have been investigated. The batch sorption model, based on the assumption of a pseudo-second order mechanism, has been developed to predict the rate constant of sorption, the equilibrium capacity and initial sorption rate with the effect of initial lead(II) concentration, peat particle size and temperature. An equilibrium capacity of sorption has been evaluated with the pseudo-second order rate equation. In addition, an activation energy of sorption has also been determined based on the pseudo-second order rate constants.

APA, Harvard, Vancouver, ISO, and other styles

6

Wigfield, Donald C., and Douglas M. Goltz. "Kinetics of reconstitution of apotyrosinase by copper." Biochemistry and Cell Biology 68, no. 2 (1990): 476–79. http://dx.doi.org/10.1139/o90-067.

Full text

Abstract:

The kinetics of the reconstitution reaction of apotyrosinase with copper (II) ions are reported. The reaction is pseudo first order with respect to apoenzyme and the values of these pseudo first order rate constants are reported as a function of copper (II) concentration. Two copper ions bind to apoenzyme, and if the second one is rate limiting, the kinetically relevant copper concentration is the copper originally added minus the amount used in binding the first copper ion to enzyme. This modified copper concentration is linearly related to the magnitude of the pseudo first order rate constan

APA, Harvard, Vancouver, ISO, and other styles

7

ITO, Kazuhide. "ESTIMATION OF SECOND ORDER RATE CONSTANT OF OZONE-LIMONENE REACTION AND SOA GENERATION." Journal of Environmental Engineering (Transactions of AIJ) 72, no. 622 (2007): 57–64. http://dx.doi.org/10.3130/aije.72.57_5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Scarlett, Jonathan, Alfonso Martinez, and Albert Guillen i Fabregas. "Second-Order Rate Region of Constant-Composition Codes for the Multiple-Access Channel." IEEE Transactions on Information Theory 61, no. 1 (2015): 157–72. http://dx.doi.org/10.1109/tit.2014.2371026.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Bunton, Clifford A., and Angela Cuenca. "Micellar effects upon reactions of the 2,2′,4,4′,4″-pentamethoxytrityl cation with nucleophiles." Canadian Journal of Chemistry 64, no. 6 (1986): 1179–83. http://dx.doi.org/10.1139/v86-195.

Full text

Abstract:

Cationic micelles of cetyltrimethylammonium chloride and bromide (CTACl and CTABr) speed attack of water upon the 2,2′,4,4′,4″-pentamethoxytrityl cation by a factor of ca. 5. The first-order rate constant in water is 5.51 s−1 at 25.0 °C. Anionic micelles of sodium dodecyl sulfate (SDS) have little effect on this reaction, but they strongly inhibit attack of OH−. In water, second-order rate constants for attack of OH−, CN−, and N3− are, respectively, 235, 177, and 2.8 × 105 M−1 s−1. Rate constants of reaction in CTACl go through maxima with increasing [surfactant] and analysis of the data shows

APA, Harvard, Vancouver, ISO, and other styles

10

Meng, Hu, Jiang-Yuan Li, and Yong-Huai Tang. "Virtual Instrument for Determining Rate Constant of Second-Order Reaction bypXBased on LabVIEW 8.0." Journal of Automated Methods and Management in Chemistry 2009 (2009): 1–7. http://dx.doi.org/10.1155/2009/849704.

Full text

Abstract:

The virtual instrument system based on LabVIEW 8.0 for ion analyzer which can measure and analyze ion concentrations in solution is developed and comprises homemade conditioning circuit, data acquiring board, and computer. It can calibrate slope, temperature, and positioning automatically. When applied to determine the reaction rate constant bypX, it achieved live acquiring, real-time displaying, automatical processing of testing data, generating the report of results; and other functions. This method simplifies the experimental operation greatly, avoids complicated procedures of manual proces

APA, Harvard, Vancouver, ISO, and other styles

11

Djordjevic, Dragan, Dragan Stojiljkovic, and Miodrag Smelcerovic. "Adsorption Kinetics of Reactive Dyes on Ash from Town Heating Plant." Archives of Environmental Protection 40, no. 3 (2014): 123–35. http://dx.doi.org/10.2478/aep-2014-0024.

Full text

Abstract:

Abstract In order to investigate the mechanism of adsorption of reactive dyes from the textile industry on ash from heating plant produced by brown coal combustion, some characteristic sorption constants are determined using Langergren adsorption equations for pseudo-ﬁ rst and pseudo-second order. Combined kinetic models of pseudo-ﬁrst order and pseudo-second order can provide a simple but satisfactory explanation of the adsorption process for a reactive dye. According to the characteristic diagrams and results of adsorption kinetic parameters of reactive dyes on ashes, for the applied amounts

APA, Harvard, Vancouver, ISO, and other styles

12

Husain, David, Paul Marshall, and John M. C. Plane. "Determination of the absolute second-order rate constant for the reaction Na + O3? NaO + O2." Journal of the Chemical Society, Chemical Communications, no. 18 (1985): 1216. http://dx.doi.org/10.1039/c39850001216.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Pe, Justin Alfred, Sung-Phil Mun, and Min Lee. "Fe–Doped TiO2–Carbonized Medium–Density Fiberboard for Photodegradation of Methylene Blue under Visible Light." Materials 14, no. 17 (2021): 4888. http://dx.doi.org/10.3390/ma14174888.

Full text

Abstract:

Fe–doped titanium dioxide–carbonized medium–density fiberboard (Fe/TiO2–cMDF) was evaluated for the photodegradation of methylene blue (MB) under a Blue (450 nm) light emitting diode (LED) module (6 W) and commercial LED (450 nm + 570 nm) bulbs (8 W, 12 W). Adsorption under daylight/dark conditions (three cycles each) and photodegradation (five cycles) were separately conducted. Photodegradation under Blue LED followed pseudo-second-order kinetics while photodegradation under commercial LED bulbs followed pseudo-first-order kinetics. Photodegradation rate constants were corrected by subtractin

APA, Harvard, Vancouver, ISO, and other styles

14

Yang, Peng Fei. "Effects of Solvent Polarity on the Urethane Reaction of 1,2-Propanediol." Advanced Materials Research 450-451 (January 2012): 38–41. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.38.

Full text

Abstract:

The urethane reaction kinetics of 1,2-propanediol with phenyl isocyanate are investigated in different solvents, such as xylene, toluene and dimethylformamide. In-situ FT-IR is used to monitor the reaction to work out rate constant. It showsthat the urethane reaction has been found to be a second order reaction, solvents largely affects reaction rates. The reaction is largely accelerated in polar solvents, following the order of dimethylformamide > toluene > xylene. Further more, when dimethylformamide is used as solvent, the rate constants are different between initial stage and final s

APA, Harvard, Vancouver, ISO, and other styles

15

Prandini, M. N., Pranoto, and S. D. Marliyana. "A comparative study of kinetics of methylene blue dye using adsorbent andisol and humic acid from lighnite by KOH-hydrothermal method." Journal of Physics: Conference Series 2190, no. 1 (2022): 012019. http://dx.doi.org/10.1088/1742-6596/2190/1/012019.

Full text

Abstract:

Abstract A comparative study of adsorption kinetics model of methylene blue (MB) dye using andisol and humic acid (HA) adsorbents from the isolation of lignite with KOH-Hydrothermal has been carried out. The adsorption process was measured by using a UV-Vis Spectrophotometer to determine concentration of the adsorbed MB. The adsorption kinetics was determined using the first-order Langmuir-Hinshelwood kinetic model, the first-order kinetic model of Lagergren (1898), and the pseudo-second-order kinetic model of McKay and Ho. The adsorption kinetic model of MB on andisol and HA followed second-o

APA, Harvard, Vancouver, ISO, and other styles

16

Aviram, I., and M. Sharabani. "Kinetic studies of the reduction of neutrophil cytochrome b-558 by dithionite." Biochemical Journal 237, no. 2 (1986): 567–72. http://dx.doi.org/10.1042/bj2370567.

Full text

Abstract:

The reduction with dithionite of neutrophil cytochrome b-558, implicated in superoxide generation by activated neutrophils, was investigated by a stopped-flow technique in non-ionic-detergent extracts of the membranes and in crude membrane particles. The dependence of the pseudo-first-order rate constants on the concentration of dithionite was consistent with a mechanism of reduction that involves the dithionite anion monomer SO2.- as the reactive species. The estimated second-order rate constant was 7.8 × 10(6) M-1 × S-1 for Lubrol PX-solubilized cytochrome b-558 and 5.1 × 10(6) M-1 × S-1 for

APA, Harvard, Vancouver, ISO, and other styles

17

Sopchak, David, and Barry Miller. "Determination of the Second-Order Rate Constant for the Reduction of Dopamine Quinone with Ascorbic Acid." Journal of Physical Chemistry A 104, no. 32 (2000): 7545–48. http://dx.doi.org/10.1021/jp0010738.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Costantini, Mauro, and Pierpaolo Soravia. "On the optimal second order decrease rate for nonlinear and symmetric control systems." AIMS Mathematics 9, no. 10 (2024): 28232–55. http://dx.doi.org/10.3934/math.20241369.

Full text

Abstract:

<p>When a control system has all its vector fields tangent to the level set of a given smooth function $ u $ at a point $ \hat x $, under appropriate assumptions that function can still have a negative rate of decrease with respect to the trajectories of the control system in an appropriate sense. In the case when the system is symmetric and $ u $ has a decrease rate of the second order, we characterise this fact and investigate the existence of a best possible rate in the class of piecewise constant controls. The problem turns out to be purely algebraic and depends on the eigenvalues of

APA, Harvard, Vancouver, ISO, and other styles

19

Ghuysen, J. M., J. M. Frère, M. Leyh-Bouille, M. Nguyen-Distèche, and J. Coyette. "Active-site-serine d-alanyl-d-alanine-cleaving-peptidase-catalysed acyl-transfer reactions. Procedures for studying the penicillin-binding proteins of bacterial plasma membranes." Biochemical Journal 235, no. 1 (1986): 159–65. http://dx.doi.org/10.1042/bj2350159.

Full text

Abstract:

Under certain conditions, the values of the parameters that govern the interactions between the active-site-serine D-alanyl-D-alanine-cleaving peptidases and both carbonyl-donor substrates and beta-lactam suicide substrates can be determined on the basis of the amounts of (serine ester-linked) acyl-protein formed during the reactions. Expressing the ‘affinity’ of a beta-lactam compound for a DD-peptidase in terms of second-order rate constant of enzyme acylation and first-order rate constant of acyl-enzyme breakdown rests upon specific features of the interaction (at a given temperature) and p

APA, Harvard, Vancouver, ISO, and other styles

20

Ryazantseva, Irina P. "Continuous method of second order with constant coefficients for monotone equations in Hilbert space." Zhurnal Srednevolzhskogo Matematicheskogo Obshchestva 22, no. 4 (2020): 449–55. http://dx.doi.org/10.15507/2079-6900.22.202004.449-455.

Full text

Abstract:

Convergence of an implicit second-order iterative method with constant coefficients for nonlinear monotone equations in Hilbert space is investigated. For non-negative solutions of a second-order difference numerical inequality, a top-down estimate is established. This estimate is used to prove the convergence of the iterative method under study. The convergence of the iterative method is established under the assumption that the operator of the equation on a Hilbert space is monotone and satisfies the Lipschitz condition. Sufficient conditions for convergence of proposed method also include s

APA, Harvard, Vancouver, ISO, and other styles

21

Khan, M. Niyaz, and Norsaadah H. Ismail. "Kinetics and Mechanism of the Cleavage of N-Phthaloylglycine in Buffers of Some Primary Amines." Journal of Chemical Research 2002, no. 12 (2002): 593–95. http://dx.doi.org/10.3184/030823402103171159.

Full text

Abstract:

Kinetic studies on the nucleophilic cleavage of N-phthaloylglycine (NPG) in buffers of 2-methoxyethylamine, and 2-hydroxyethylamine reveal the relationship: knapp = A1 [Am]T/(1 + A2 [Am]T) where A1 and A2 are constants (kinetic parameters) and knapp and [Am]T represent apparent nucleophilic second-order rate constant and total amine buffer concentration, respectively.

APA, Harvard, Vancouver, ISO, and other styles

22

Hojatti, Mahmood, and Kenneth T. Leffek. "Solvent effects on the rates and equilibria of the proton transfer reaction of 4-nitrophenylphenylcyanomethane to tetramethylguanidine." Canadian Journal of Chemistry 64, no. 12 (1986): 2365–67. http://dx.doi.org/10.1139/v86-390.

Full text

Abstract:

The equilibrium constants and second-order rate constants, both at 25 °C, have been determined for the proton transfer reaction from 4-nitrophenylphenylcyanomethane to tetramethylguanidine in a number of different solvents. While the equilibrium constants show a good correlation with the dielectric constant function D − 1/2D + 1, the rate constants are randomly scattered with respect to this parameter and also the solvent parameter ET. The rate constants do show a general trend in relation to the solvent parameters AN and DN. These results are interpreted as support for the hypothesis that the

APA, Harvard, Vancouver, ISO, and other styles

23

RAMOS-ESCUDERO, Fernando, María L. GONZÁLEZ-MIRET, and Agustín GARCÍA-ASUERO. "EFFECT OF VARIOUS EXTRACTION SYSTEMS ON THE ANTIOXIDANT ACTIVITY KINETIC AND COLOR OF EXTRACTS FROM PURPLE CORN." Vitae 19, no. 1 (2012): 41–48. http://dx.doi.org/10.17533/udea.vitae.5356.

Full text

Abstract:

The purpose of this study was to investigate the effect of extraction systems on the anthocyanin index, antioxidant kinetics (DPPH-radical scavenging capacity) and color of purple corn (Zea mays) seeds. The factors studied were: extraction system (methanol, 100%, 80%, 60%, 40, 20% v/v) using hydrochloric acid as a means of acidifying. Tristimulus colorimetry was applied to evaluate quantitatively and qualitatively the process. The estimated effect and ANOVA parameters were calculated. The anthocyanins index in different extraction systems was between 1.09 to 2.87 mg/g. The highest anthocyanin

APA, Harvard, Vancouver, ISO, and other styles

24

Fakhra Jabeen and Miad Ali Siddiq. "Kinetic study of the hydrolysis of ester with mineral acid by spectrophotometer at different temperature." Open Access Research Journal of Chemistry and Pharmacy 4, no. 2 (2023): 029–43. http://dx.doi.org/10.53022/oarjcp.2023.4.2.0085.

Full text

Abstract:

To determine the kinetic parameters and activation energy of the hydrolysis of ethyl acetate with hydrochloric acid monitored by spectrophotometry. The first order fits were automatically drawn and the values of the first order rate constants (k) were calculated using standard equations as part of the program. Acidic hydrolysis of ethyl acetate is essentially an irreversible and first order reaction whereas alkaline hydrolysis is an irreversible and second order reaction. Rate of reaction is the change in the number of molecules of reacting species per unit volume per unit time. In this hydrol

APA, Harvard, Vancouver, ISO, and other styles

25

Yang, Peng Fei. "Catalytic Effect of Triethylamine on the Urethane Reaction of Asymmetry Diol." Advanced Materials Research 472-475 (February 2012): 1837–40. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.1837.

Full text

Abstract:

The urethane reaction kinetics of 1,2-propanediol and 1,3-butanediol with phenyl isocyanate are investigated in toluene. In-situ FT-IR is used to monitor the reaction to work out rate constant. The urethane reaction has been found to be a second order reaction and is largely accelerated with triethylamine as catalyst. Furthermore, the rate constants are different between initial stage and final stage when triethylamine is used as catalyst, which belongs to different hydroxyls in asymmetry diol. However, when there is no catalyst in the reaction system, the rate constant is the same. That is, t

APA, Harvard, Vancouver, ISO, and other styles

26

Khorassani, S. M. Habibi, M. T. Maghsoodlou, A. Ebrahimi, H. Roohi, M. Zakarianezhad, and M. Moradian. "Kinetic Investigation of the Reactions between Triphenylphosphine, Dialkyl Acetylenedicarboxylates and Sh-Acid Such as 2-Thiazoline-2-Thiol or 2-Mercaptobenzoxazole by Uv Spectrophotometry." Progress in Reaction Kinetics and Mechanism 30, no. 1-2 (2005): 127–44. http://dx.doi.org/10.3184/007967405777874877.

Full text

Abstract:

Kinetic studies were made of the reactions between triphenylphosphine, dialkyl acetylenedicarboxylates in the presence of SH-acids, such as 2-thiazoline-2-thiol or 2-mercaptobenzoxazole. To determine the kinetic parameters of the reactions, they were monitored by UV spectrophotometery. The second order fits were drawn by the software associated with a Cary UV spectrophotometer model Bio-300 at appropriate wavelength. The values of the second order rate constant (k2) were calculated using standard equations within the program. Within the temperature range studied, the dependence of the second o

APA, Harvard, Vancouver, ISO, and other styles

27

Kusuma, Heri Septya, and Mahfud Mahfud. "Preliminary Study: Kinetics of Oil Extraction from Sandalwood by Microwave-assisted Hydrodistillation." ASEAN Journal of Chemical Engineering 15, no. 2 (2016): 62. http://dx.doi.org/10.22146/ajche.49687.

Full text

Abstract:

Sandalwood and its oil, is one of the oldest known perfume materials and has a long history (more than 4000 years) of use as mentioned in Sanskrit manuscripts. Sandalwood oil plays an important role as an export commodity in many countries and its widely used in the food, perfumery and pharmaceuticals industries. The aim of this study is to know and verify the kinetics and mechanism of microwave-assisted hydrodistillation of sandalwood based on a second-order model. In this study, microwave-assisted hydrodistillation is used to extract essential oils from sandalwood. The extraction was carried

APA, Harvard, Vancouver, ISO, and other styles

28

Hidayah, Euis Nurul, R. Mohammad Alghaf Dienullah, Nur Aini Maulidifa, and Wahyu Setiawan. "Kinetic adsorption of Fe metal in aqueous solution using maggot shell." IOP Conference Series: Earth and Environmental Science 1454, no. 1 (2025): 012032. https://doi.org/10.1088/1755-1315/1454/1/012032.

Full text

Abstract:

Abstract Black prepupae are remnants of the maggot shell or the result of the detachment of several exoskeletal parts during the metamorphosis of pupae into adult flies (Black Soldier Fly) that are not used. These prepupae were then investigated for their potential as raw materials for producing biosorbents to reduce iron metal ions in water through adsorption methods. The study aimed to determine the adsorption kinetics of the biosorbent for aqueous solution (Fe artificial solution and well water). Adsorption was evaluated using the pseudo-first-order model and the pseudo-second-order model,

APA, Harvard, Vancouver, ISO, and other styles

29

Marczewska, Barbara, Andrzej Persona, and Marek Przegaliński. "Faradaic Impedance Study of Mn(II) Reduction Mechanism in NaClO4 and NaCl Solutions on Mercury Electrode." Collection of Czechoslovak Chemical Communications 67, no. 11 (2002): 1589–95. http://dx.doi.org/10.1135/cccc20021589.

Full text

Abstract:

The electrochemical reaction of the Mn(II)/Mn(Hg) system on mercury electrode was studied in 1 M NaClO4 and 1 M NaCl as supporting electrolytes of different complexing and adsorptive properties. The impedance measurements confirmed the two-stage electroreduction of the Mn(II) in investigated solutions. Both the apparent and the true rate constants of the second electron transfer in both supporting electrolytes are lower by one order of magnitude than the rate constant of the first electron transfer. Similar values of corrected rate constants in both electrolytes suggest the similarity in mecha

APA, Harvard, Vancouver, ISO, and other styles

30

McClelland, Robert A., and Claude Moreau. "Reversible ring opening in the hydrolysis of spiro ortho esters." Canadian Journal of Chemistry 63, no. 10 (1985): 2673–78. http://dx.doi.org/10.1139/v85-444.

Full text

Abstract:

Hydrolysis kinetics are reported for four spiro ortho esters: 3,4-dihydro-6-methoxy-1H-2-benzopyran-1-spiro-2′-1′,3′-dioxolane (13), its 1′,3′-dioxane analog (14), and the 6-unsubstituted versions of each (11 and 12). For comparison, also included are the diethoxy analogs: 1,1-diethoxy-3,4-dihydro-6-methoxy-1H-2-benzopyran (10) and the 6-unsubstituted compound (9). Product analysis implicates an initial opening of the dioxolane or dioxane ring in the spiro ortho esters, as expected on the basis of stereoelectronic considerations. The intermediate dialkoxycarbocations can be observed in HCl sol

APA, Harvard, Vancouver, ISO, and other styles

31

Marasinghe, P. A. B., and L. M. Wirth. "A graphical solution of the second-reaction rate constant of a two-step consecutive first-order reaction." Journal of Chemical Education 69, no. 4 (1992): 285. http://dx.doi.org/10.1021/ed069p285.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Hemmateenejad, Bahram, Ghodratollah Absalan, Mohsen Nekoeinia, and Fatemeh Esfandiyari. "Estimating the rate constant in second-order kinetics using hard-soft-net analyte signal (HS-NAS) method." Chemometrics and Intelligent Laboratory Systems 102, no. 1 (2010): 35–44. http://dx.doi.org/10.1016/j.chemolab.2010.03.004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Neha, Kandpal, K. Dewangan Hitesh, L. Satnami Manmohan, and Nagwanshi Rekha. "Nucleophilicity of aromatic and aliphatic hydroxamate ions towards C=O and P=O center in cationic micellar media." Journal of Indian Chemical Society Vol. 93, Jan 2016 (2016): 71–78. https://doi.org/10.5281/zenodo.5607160.

Full text

Abstract:

School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492 010, Chhattisgarh, India Department of Chemistry, Govt. Madhav Science P.G. College, Ujjain-456 010, Madhya Pradesh, India <em>E-mail</em> : manmohanchem@gmail.com <em>Manuscript received online 26 June 2015, accepted 13 August 2015</em> The kinetics of the hydrolysis of <em>p</em>-nitrophenyl benzoate (PNPB) and <em>p</em>-nitrophenyldiphenyl phosphate (PNPDPP) by hydroxamate ions (R´(C=O)N(RO<sup>–</sup>)) have been investigated in aqueous cationic micellar media at pH 6.5 to 12.0 and 27 ºC. The ps

APA, Harvard, Vancouver, ISO, and other styles

34

Wang, Hanjie, and Kenneth J. Hunt. "Feedback control of heart rate during treadmill exercise based on a two-phase response model." PLOS ONE 18, no. 10 (2023): e0292310. http://dx.doi.org/10.1371/journal.pone.0292310.

Full text

Abstract:

This work investigated automatic control of heart rate during treadmill exercise. The aim was to theoretically derive a generic feedback design strategy that achieves a constant input sensitivity function for linear, time-invariant plant models, and to empirically test whether a compensator C2 based on a second-order model is more dynamic and has better tracking accuracy than a compensator C1 based on a first-order model. Twenty-three healthy participants were tested using first and second order compensators, C1 and C2, respectively, during 35-minute bouts of constant heart rate treadmill runn

APA, Harvard, Vancouver, ISO, and other styles

35

Fernea, Adriana, Moreno Galleni та Jean-Marie Frère. "Kinetics of the Interaction between BAL29880 and LK157 and the Class C β-Lactamase CHE-1". Antimicrobial Agents and Chemotherapy 60, № 3 (2016): 1747–50. http://dx.doi.org/10.1128/aac.02062-15.

Full text

Abstract:

The chromosome-encoded class C β-lactamase CHE-1 produced byEnterobacter cloacaeexhibits a lower sensitivity to avibactam than the P99 enzyme from which it is derived by a 6-residue deletion in the H-10 helix. In the present study, we investigated the sensitivity of CHE-1 to two other β-lactamase inhibitors: LK-157 (or Lek 157), a tricyclic β-lactam, and BAL29880, a bridged monobactam. With both compounds, the second-order rate constants for inactivation were significantly lower for CHE-1, which can thus be considered an inactivator-resistant mutant of P99. However, the second-order rate const

APA, Harvard, Vancouver, ISO, and other styles

36

Wang, Zhi Feng, Si Dong Li, and Xiao Dong She. "Vulcanization Kinetics of Natural Rubber Coagulated by Microorganisms with Use of a Vulcameter." Advanced Materials Research 160-162 (November 2010): 1181–86. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.1181.

Full text

Abstract:

Kinetics of vulcanization of natural rubber coagulated by microorganisms (NR-m) was studied with the use of a vulcameter. In the induction period of vulcanization, the time t0 of NR-m is shorter than that of natural rubber coagulated by acid (NR-a), and the rate constant k1/a of NR-m are greater than that of NR-a. Both the curing periods of NR-m and NR-a consist of two stages. The first stage follows first-order reaction. The rate constants k2 of NR-m in the first stage are greater than that of NR-a at the same temperature, and so are the activation energy E2. The second stage (end stage of th

APA, Harvard, Vancouver, ISO, and other styles

37

Wigfield, Donald C., and Season Tse. "Oxidation of the mercurous ion by peroxidase." Canadian Journal of Chemistry 64, no. 5 (1986): 969–72. http://dx.doi.org/10.1139/v86-162.

Full text

Abstract:

The kinetics of oxidation of the mercurous ion by peroxidase have been measured by following the disappearance of mercurous ion using cold-vapour atomic absorption spectroscopy. Pseudo-first-order kinetics are observed with respect to mercurous ion, and the pseudo-first-order rate constants are linearly related to peroxidase concentration, showing first-order dependence on peroxidase. This behaviour is identical to oxidation of elemental mercury, and the second-order rate constant, 1.44 × 104 M−1 s−1 at 23 °C, is also, within experimental error, the same as that for elemental mercury oxidation

APA, Harvard, Vancouver, ISO, and other styles

38

Krivitskaya, Alexandra V., Maria S. Kuryshkina, Maria Y. Eremina, Ivan V. Smirnov, and Maria G. Khrenova. "Molecular Basis of Influence of A501X Mutations in Penicillin-Binding Protein 2 of Neisseria gonorrhoeae Strain 35/02 on Ceftriaxone Resistance." International Journal of Molecular Sciences 25, no. 15 (2024): 8260. http://dx.doi.org/10.3390/ijms25158260.

Full text

Abstract:

The increase in the resistance of mutant strains of Neisseria gonorrhoeae to the antibiotic ceftriaxone is pronounced in the decrease in the second-order acylation rate constant, k2/KS, by penicillin-binding protein 2 (PBP2). These changes can be caused by both the decrease in the acylation rate constant, k2, and the weakening of the binding affinity, i.e., an increase in the substrate constant, KS. A501X mutations in PBP2 affect second-order acylation rate constants. The PBP2A501V variant exhibits a higher k2/KS value, whereas for PBP2A501R and PBP2A501P variants, these values are lower. We p

APA, Harvard, Vancouver, ISO, and other styles

39

Zheng, Zhen, Peiyao Chen, Gongyu Li, et al. "Mechanistic study of CBT-Cys click reaction and its application for identifying bioactive N-terminal cysteine peptides in amniotic fluid." Chemical Science 8, no. 1 (2017): 214–22. http://dx.doi.org/10.1039/c6sc01461e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Thurston, Tom J., and Richard G. Brereton. "Estimation of second order rate constants using chemometric methods with kinetic constraints." Analyst 127, no. 5 (2002): 659–68. http://dx.doi.org/10.1039/b111051a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Bijlsma, Sabina, Hans F. M. Boelens, and Age K. Smilde. "Determination of Rate Constants in Second-Order Kinetics Using UV-Visible Spectroscopy." Applied Spectroscopy 55, no. 1 (2001): 77–83. http://dx.doi.org/10.1366/0003702011951281.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

LYNAS, John, and Brian WALKER. "Peptidyl inverse esters of p-methoxybenzoic acid: a novel class of potent inactivator of the serine proteases." Biochemical Journal 325, no. 3 (1997): 609–16. http://dx.doi.org/10.1042/bj3250609.

Full text

Abstract:

A series of novel synthetic peptides, containing a C-terminal β-amino alcohol linked to p-methoxybenzoic acid via an ester linkage, have been prepared and tested as inhibitors against typical members of the serine protease family. For example, the sequences Ac-Val-Pro-NH-CH-(CH2-C6H5)-CH2O-CO-C6H4-OCH3 (I) and Ac-Val-Pro-NH-CH-[CH-(CH3)2]-CH2O-CO-C6H4-OCH3 (II), which fulfil the known primary and secondary specificity requirements of chymotrypsin and elastase respectively, have been found to behave as exceptionally potent irreversible inactivators of their respective target protease. Thus I wa

APA, Harvard, Vancouver, ISO, and other styles

43

Song, Changying, Lei Chen, and Jinhuan Shan. "Kinetics and Mechanism of Oxidation of Leucine and Alanine by Ag(III) Complex in Alkaline Medium." Research Letters in Inorganic Chemistry 2008 (October 14, 2008): 1–4. http://dx.doi.org/10.1155/2008/786857.

Full text

Abstract:

Kinetics and mechanism of oxidation of leucine and alanine by Ag(III) complex were studied spectrophotometrically in alkaline medium at constant ion strength. The reaction was in first order with respect to Ag(III) complex and amino acids (leucine, alanine). The second-order rate constant, k−, decreased with the increasing in [OH−] and [IO4−]. A plausible mechanism was proposed from the kinetics study, and the rate equations derived from mechanism can explain all experimental phenomena. The activation parameters were calculated at 298.2 K.

APA, Harvard, Vancouver, ISO, and other styles

44

Tran, Hai Nguyen. "Differences between Chemical Reaction Kinetics and Adsorption Kinetics: Fundamentals and Discussion." Journal of Technical Education Science, no. 70B (June 28, 2022): 33–47. http://dx.doi.org/10.54644/jte.70b.2022.1154.

Full text

Abstract:

Adsorption kinetics is an essential part in adsorption studies. The pseudo-first-order (PFO) and pseudo-second-order (PSO) models are frequently used to model the experimental dataset of time-dependent adsorption. The differential equations (based on reaction rate and rate law) of the PFO and PSO models are similar to those of chemical reactions (i.e., first and second order-kinetic reactions). The adsorption kinetics is illustrated through the plot of qt (the amount of adsorbate adsorbed by adsorbent at time t) vs. time. This plot includes two important regions (kinetic and equilibrium). The

APA, Harvard, Vancouver, ISO, and other styles

45

IZUMI, KENJIRO, ROBERT G. CASSENS, and MARION L. GREASER. "Rate Constant and Activation Energy for Formation of a Nitrosoascorbic Acid Intermediate Compound." Journal of Food Protection 48, no. 4 (1985): 346–50. http://dx.doi.org/10.4315/0362-028x-48.4.346.

Full text

Abstract:

The rate of decomposition of nitrite as a result of its reaction with ascorbic acid was determined from spectrophotometric measurements at various pH values and temperatures. The reaction proceeded initially as second order. The product was nitrosoascorbic acid, and it was formed with an increasing rate constant with decreasing pH. The rate was proportional to the concentration of nitrite from pH 4.2 to 5.38. As the reaction proceeded further at lower pH and higher temperature, it deviated from the second order reaction plot, giving kinetic evidence that the formation of 2,3-dinitrosoascorbic

APA, Harvard, Vancouver, ISO, and other styles

46

Tsai, Yi-Hsiou, Donyau Chiang, Yu-Ting Li, Tsong-Pyng Perng, and Sanboh Lee. "Thermal Degradation of Vegetable Oils." Foods 12, no. 9 (2023): 1839. http://dx.doi.org/10.3390/foods12091839.

Full text

Abstract:

Vegetable oils provide lipids and nutrition and provide foods with a desirable flavor, color, and crispy texture when used to prepare fried foods. However, the oil quality is degraded at elevated temperatures, and thus must be examined frequently because of the damage to human health. In this study, sunflower, soybean, olive, and canola oils were examined, and their properties were measured periodically at different elevated temperatures. The unsaturated triglyceride in oils reacted with the environmental oxygen or water vapor significantly changes in optical absorbance, viscosity, electrical

APA, Harvard, Vancouver, ISO, and other styles

47

Galezowski, Wlodzimierz, and Arnold Jarczewski. "Study of the dissociation of the products of some proton transfer reactions in acetonitrile solvent." Canadian Journal of Chemistry 70, no. 3 (1992): 935–42. http://dx.doi.org/10.1139/v92-126.

Full text

Abstract:

The conductometric study of the products of the proton transfer reactions of C-acids (nitriles, nitroalkanes, and 2,4,6-trinitrotoluene) with the strong amine bases (1,1,3,3-tetramethylguanidine (TMG), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 1,8-bis(dimethylamino)naphthalene (DMAN), and piperidine) in acetonitrile shows their large degree of dissociation into free ions. The dissociation constant values have been estimated at 25 °C to be larger than 1 × 10−4 M. This weakens the formalism commonly accepted in spectrophotometric kinetic studies of these systems of reactions, based on the assump

APA, Harvard, Vancouver, ISO, and other styles

48

Rivas-Perez, J., E. L. Tullborg, and S. A. Banwart. "The kinetics of O2(aq) reduction during oxidative weathering of naturally occurring fracture minerals in groundwater." Mineralogical Magazine 67, no. 2 (2003): 399–414. http://dx.doi.org/10.1180/0026461036720108.

Full text

Abstract:

Aqueous chemistry methods assessed the kinetic reactivity and reduction capacity of fracture-filling minerals from a granitic groundwater environment at the Aspo Hard Rock Laboratory, a field station for research and development into the geological disposal of spent nuclear fuel. Naturally occurring fracture filling reacted with oxygenated test solutions of known composition in recirculating batch reactors.The loss of O2(aq) with time was consistent with second-order reaction kinetics where O2(aq) is consumed through reduction by reaction with structural Fe(II) at the surface of the fracture m

APA, Harvard, Vancouver, ISO, and other styles

49

Kaválek, Jaromír, Josef Jirman, and Vojeslav Štěrba. "Reactions of 1,3-diacylthioureas with methoxide ion and with amines." Collection of Czechoslovak Chemical Communications 52, no. 1 (1987): 120–31. http://dx.doi.org/10.1135/cccc19870120.

Full text

Abstract:

Rate constants of base-catalyzed methanolysis and dissociation constants in methanol have been determined for benzoylthiourea (II), 1,3-diacetylthiourea (III), 1,3-dibenzoylthiourea (IV), and 1-acetyl-3-benzoylthiourea (V). With the diacyl derivatives III and IV, the reaction of methoxide ion with the neutral substrate is accompanied by that of methoxide with the substrate anion (at higher alkoxide concentrations). Above 0.1 mol l-1 CH3O(-), the rate constants are also affected by medium. The rate of the reaction of neutral diacyl derivative is decreased, and that of the reaction of methoxide

APA, Harvard, Vancouver, ISO, and other styles

50

ZHANG, Yi, Zhe ZHANG, Ming-Zhu LIU, et al. "Determination of the Second-Order Rate Constant for the Saponification of Ethyl Acetate by Real-Time Conductivity Measurements." University Chemistry 31, no. 3 (2016): 55–63. http://dx.doi.org/10.3866/pku.dxhx20160355.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!