Diffusive properties of water in Artemia cysts as determined from quasi-elastic neutron scattering spectra. [Artemia shrimp]

Journal Article · Tue May 01 00:00:00 EDT 1984 · Biophys. J.; (United States)

DOI:https://doi.org/10.1016/S0006-3495(84)84239-3· OSTI ID:5864024

Trantham, E C; Rorschach, H E; Clegg, J S; Hazlewood, C F; Nicklow, R M; Wakabayashi, N

Results have been obtained on the quasi-elastic spectra of neutrons scattered from pure water, 20% agarose gel (hydration four grams H/sub 2/O per gram of dry solid) and cysts of the brine shrimp Artemia for hydrations between 0.10 and 1.2 grams H/sub 2/O per gram of dry solids. The spectra were interpreted using a two-component model that included contributions from the covalently bonded protons and the hydration water, and a mobile water fraction. The mobile fraction was described by a jump-diffusion correlation function for the translation motion and a simple diffusive orientational correlation function. The results for the line widths ..gamma..(Q/sup 2/) for pure water were in good agreement with previous measurements. The agarose results were consistent with NMR measurements that show a slightly reduced translational diffusion for the mobile water fraction. The Artemia results show that the translational diffusion coefficient of the mobile water fraction was greatly reduced from that of pure water. The line width was determined mainly by the rotational motion, which was also substantially reduced from the pure water value as determined from dielectric relaxation studies. The translational and rotational diffusion parameters were consistent with the NMR measurements of diffusion and relaxation. Values for the hydration fraction and the mean square thermal displacement as determined from the Q-dependence of line areas were also obtained.

• Research Organization: Rice Univ., Houston, TX (United States)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5864024
• Journal Information: Biophys. J.; (United States), Vol. 45:5
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
WATER
MOLECULAR STRUCTURE
AGAR
BODY FLUIDS
COMPARATIVE EVALUATIONS
DIFFUSION
GELS
HYDRATION
NEUTRON SPECTRA
QUASI-ELASTIC SCATTERING
SHRIMP
ANIMALS
AQUATIC ORGANISMS
ARTHROPODS
BIOLOGICAL MATERIALS
CARBOHYDRATES
COLLOIDS
CRUSTACEANS
DECAPODS
DIRECT REACTIONS
DISPERSIONS
HYDROGEN COMPOUNDS
INVERTEBRATES
MATERIALS
NUCLEAR REACTIONS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLYSACCHARIDES
QUASI-FREE REACTIONS
SACCHARIDES
SCATTERING
SOLVATION
SPECTRA
550201* - Biochemistry- Tracer Techniques