Kinetics of 2,4-Dichlorophenoxyacetic Acid Content in an Auxin-Dependent Suspension Culture of Nicotiana tabacum Cells

1995 ◽  
Vol 147 (3-4) ◽  
pp. 383-390 ◽  
Author(s):  
K.B. Koens ◽  
F.T. Nicoloso ◽  
Th. B. Van Vliet ◽  
M. Harteveld ◽  
C.J.M. Boot ◽  
...  
Keyword(s):  
Nicotiana Tabacum ◽  
Suspension Culture ◽  
Acid Content ◽  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Kinetics Of

scholarly journals Modeling of Phenoxy Acid Herbicide Mineralization and Growth of Microbial Degraders in 15 Soils Monitored by Quantitative Real-Time PCR of the FunctionaltfdAGene

2012 ◽  
Vol 78 (15) ◽  
pp. 5305-5312 ◽  
Author(s):  
Jacob Bælum ◽  
Emmanuel Prestat ◽  
Maude M. David ◽  
Bjarne W. Strobel ◽  
Carsten S. Jacobsen
Keyword(s):  
Real Time ◽  
Real Time Pcr ◽  
Kinetic Models ◽  
Exponential Model ◽  
Dichlorophenoxyacetic Acid ◽  
Order Kinetic ◽  
Clear Trend ◽  
Gene Copies ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Kinetics Of

ABSTRACTMineralization potentials, rates, and kinetics of the three phenoxy acid (PA) herbicides, 2,4-dichlorophenoxyacetic acid (2,4-D), 4-chloro-2-methylphenoxyacetic acid (MCPA), and 2-(4-chloro-2-methylphenoxy)propanoic acid (MCPP), were investigated and compared in 15 soils collected from five continents. The mineralization patterns were fitted by zero/linear or exponential growth forms of the three-half-order models and by logarithmic (log), first-order, or zero-order kinetic models. Prior and subsequent to the mineralization event,tfdAgenes were quantified using real-time PCR to estimate the genetic potential for degrading PA in the soils. In 25 of the 45 mineralization scenarios, ∼60% mineralization was observed within 118 days. Elevated concentrations oftfdAin the range 1 × 105to 5 × 107gene copies g−1of soil were observed in soils where mineralization could be described by using growth-linked kinetic models. A clear trend was observed that the mineralization rates of the three PAs occurred in the order 2,4-D > MCPA > MCPP, and a correlation was observed between rapid mineralization and soils exposed to PA previously. Finally, for 2,4-D mineralization, all seven mineralization patterns which were best fitted by the exponential model yielded a highertfdAgene potential after mineralization had occurred than the three mineralization patterns best fitted by the Lin model.

Photochemical decomposition of 2,4-dichlorophenoxy acetic acid (2,4-D) in aqueous solution. I. Kinetic study

1997 ◽  
Vol 35 (4) ◽  
pp. 31-39 ◽  
Author(s):  
María I. Cabrera ◽  
Carlos A. Martín ◽  
Orlando M. Alfano ◽  
Alberto E. Cassano
Keyword(s):  
Aqueous Solution ◽  
Radiation Effects ◽  
Batch Reactor ◽  
Dichlorophenoxyacetic Acid ◽  
Intrinsic Kinetics ◽  
Photochemical Decomposition ◽  
Kinetic Expression ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Dichlorophenoxy Acetic Acid ◽  
Kinetics Of

The intrinsic kinetics of the photochemical decomposition of 2,4-dichlorophenoxyacetic acid in aqueous solution has been studied using light of 253.7 nm. Experiments were carried out in a well stirred batch reactor irradiated from its bottom by means of a tubular lamp and a parabolic reflector. Results were analyzed in terms of a very simple kinetic expression. Absorbed radiation effects were duly quantified by means of a one-dimensional radiation field model. This approach incorporates a variable absorption coefficient that is a function of the 2,4-D conversion. The decomposition kinetics can be properly represented with a point valued equation of the following form: RD, λ = − ΦD,λ eλ(y).

An investigation of the growth characteristics of oil-palm (Elaeis guineensis) suspension cultures using 31P NMR

1983 ◽  
Vol 3 (12) ◽  
pp. 1141-1148 ◽  
Author(s):  
W. A. Hughes ◽  
S. M. Bociek ◽  
J. N. Barrett ◽  
R. G. Ratcliffe
Keyword(s):  
Suspension Culture ◽  
Oil Palm ◽  
Nmr Spectra ◽  
31P Nmr ◽  
Elaeis Guineensis ◽  
Growth Characteristics ◽  
Dichlorophenoxyacetic Acid ◽  
Meristematic Tissue ◽  
Seedling Roots ◽  
2,4 Dichlorophenoxyacetic Acid

High-resolution 31P nuclear-magnetic-resonance (NMR) spectra are reported for oil-palm (Elaeis guineensis) cells in suspension culture. The spectra are a signicant improvement on the results that have appeared for other cultures and they are comparable with the spectra of the meristematic tissue in seedling roots. The NMR technique was used in parallel with other analytical methods to investigate the growth characteristics of the suspension culture, indluding the effect of 2,4-dichlorophenoxyacetic acid.

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