The water self-diffusion behavior in chlorella water suspension was investigated by pulsed field gradient NMR technique. Three types of water was determined, which differs according to the self-diffusion coefficients; bulk water, extracellular and intracellular water. Intracellular and extracellular water self-diffusion were restricted, and the sizes of restriction regions were 3.4 microm and 17 microm, respectively. The water molecular exchange process between these three diffusion regions was investigated. The residence time and exchange rate constant for chlorella cells were obtained. The cell wall permeability determined from the rate constant as 3 x 10(-6) m/s agreed with the permeability 10(-6) m/s obtained from time dependence of intracellular water self-diffusion coefficient. The structural cluster model of chlorella cell is estimated to describe the extracellular water self-diffusion in chlorella water suspension.

Download full-text PDF

Source
http://dx.doi.org/10.1016/s0730-725x(03)00206-6DOI Listing

Publication Analysis

Top Keywords

water self-diffusion
20
water
11
self-diffusion chlorella
8
field gradient
8
gradient nmr
8
chlorella water
8
water suspension
8
intracellular water
8
extracellular water
8
rate constant
8

Similar Publications

Noncentrifugal sugar (NCS) is an unrefined, dark brown sugar containing minerals and plant secondary metabolites, unlike refined white sugar (WS). This study explored using NCS in confectionary jellies as an alternative sugar. We used different concentrations of NCS and WS to prepare low methoxyl pectin (LMP) confectionery gels characterized by their physical and rheological properties along with time-domain nuclear magnetic resonance (TD-NMR) relaxometry.

View Article and Find Full Text PDF

Stokes-Einstein Relation in Different Models of Water.

Molecules

November 2024

Joint Institute for High Temperatures, Russian Academy of Sciences, 125412 Moscow, Russia.

The purpose of this paper is to discuss to which extent a microscopic version of the Stokes-Einstein (SE) relation without the hydrodynamic radius applies to liquid water. We demonstrate that the self-diffusion and shear viscosity data for five popular water models, recently reported by Ando [J. Chem.

View Article and Find Full Text PDF
Article Synopsis
  • Efficient conduction of hydroxide ions (OH) in anion exchange membranes (AEMs) is crucial for improving sustainable technologies like water electrolysis and fuel cells.
  • Researchers developed innovative AEMs with rigid, heteroatom-free micropores engineered for fast and stable ionic transport, resulting in a significant increase in conductivity and durability.
  • These new membranes not only improve energy efficiency and lifespan, but also allow for the use of less expensive catalysts, making them promising for future advancements in electrochemical applications.
View Article and Find Full Text PDF

Machine learning potentials (MLPs) are promising for various chemical systems, but their complexity and lack of physical interpretability challenge their broad applicability. This study evaluates the transferability of the deep potential (DP) and neural equivariant interatomic potential (NequIP) models for graphene-water systems using numerical metrics and physical characteristics. We found that the data quality from density functional theory calculations significantly influences MLP predictive accuracy.

View Article and Find Full Text PDF

Revised 4-Point Water Model for the Classical Drude Oscillator Polarizable Force Field: SWM4-HLJ.

J Chem Theory Comput

November 2024

University of Maryland Computer-Aided Drug Design Center, Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Maryland 21201, United States.

In this work the 4-point polarizable SWM4 Drude water model is reparametrized. Multiple models were developed using different strategies toward reproduction of specific target data. Results indicate that no individual model can reproduce all the selected target data in the context of the present form of the potential energy function.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!