Reaction Transport Processes
Reaction Transport Processes - Related Videos
11:55
Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
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Cited by 2 •
2016
The presented protocol describes the analysis of membrane protein mediated transport on the single transporter level using pore-spanning solvent-free lipid bilayers. This is achieved by the creation of bulk produced nanopore array chips, combined with highly parallel data acquisition and analysis, enabling the future establishment of membrane protein effector screenings.
09:56
Real-time Monitoring of Reactions Performed Using Continuous-flow Processing: The Preparation of 3-Acetylcoumarin as an Example
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Cited by 6 •
2015
Real-time monitoring allows for fast optimization of reactions performed using continuous-flow processing. Here the preparation of 3-acetylcoumarin is used as an example. The apparatus for performing in-situ Raman monitoring is described, as are the steps required to optimize the reaction.
09:48
Original Experimental Approach for Assessing Transport Fuel Stability
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Cited by 5 •
2016
Oxidation stability of transport fuels has become a concern for future fuel development. This work presents an original methodology developed by IFP Energies Nouvelles for assessing fuel stability using two different reactors. This methodology was successfully applied to gain an in-depth understanding of the oxidation kinetics and pathways of model molecules and commercial fuels.
15:37
Enthalpy of Reaction - Student Protocol
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Collecting Data for Calculating the Heat Capacity of a CalorimeterExpand This experiment will use a constant-pressure calorimeter made of two stacked polystyrene cups, a cardboard lid, and a probe measuring the temperature of a solution in real-time. Polystyrene is a good insulator, so you can assume that no heat is exchanged between the inside and outside of the cups. The calorimeter itself will absorb some heat, which you'll account...
02:22
Regulated mRNA Transport
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2020
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
FAQs
Concentration gradients provide a driving force for species movement, so they influence the direction and magnitude of transport fluxes. Chemical reactions can consume or generate species within the same region, reshaping those gradients over time. As a result, movement and transformation cannot always be analyzed independently when predicting concentration distributions or chemical performance.
Diffusion moves species in response to concentration differences, convection carries matter through bulk motion, and migration describes movement associated with another transport influence. Each mechanism contributes differently to species flux, while chemical reactions modify the concentrations that drive or accompany transport. Identifying the relevant mechanism is therefore essential for selecting an appropriate reaction transport model.
Rate laws describe how chemical transformations change species concentrations, whereas transport equations describe how those species move through a system. Coupling them shows how local reaction rates affect spatial concentration profiles and how transport supplies or removes reacting material. This combined description supports predictions that neither reaction kinetics nor transport analysis can provide alone.
Reactions can consume reactants or produce products, altering local concentrations and therefore changing concentration gradients and fluxes. These changes may vary from one location to another, especially in systems where matter travels through a reaction zone. Including reaction effects in the analysis helps explain why transport patterns and species distributions evolve as chemistry proceeds.
A model typically starts by identifying the chemical species and the relevant movement mechanisms. The analyst then combines mass balances with reaction rate laws and transport equations, applies the system conditions, and calculates concentration profiles or related outcomes. The resulting predictions can be used to evaluate reaction yields and assess how the system is expected to perform.
These processes are relevant in reaction vessels, porous materials, membranes, catalytic systems, and environmental media. In each setting, species may encounter different pathways for movement and chemical transformation. Modeling those coupled effects helps researchers and process designers examine concentration profiles, estimate reaction yields, and optimize the performance of chemical processes or materials.