Relation between functional properties of alumina-based nanocomposites and locations of dispersed particles

Hemocyanin of the horseshoe crab (Limulus polyphemus) has been studied in nany ways. Recently the structure, dissociation and reassembly was studied using electron microscopy of negatively stained specimens as the method of investigation. Crystallization of the protein proved to be possible and X-ray crystallographic analysis was started. Also fluorescence properties of the hemocyanin after dialysis against Tris-glycine buffer + 0.01 M EDTA pH 8.9 (so called “stripped” hemocyanin) and its fractions II and V were studied, as well as functional properties of the fractions by NMR. Finally the temperature-jump method was used for assaying the oxygen binding of the dissociating molecule and of preparations of isolated subunits. Nevertheless very little is known about the structure of the intact molecule. Schutter et al. suggested that the molecule possibly consists of two halves, combined in a staggered way, the halves themselves consisting of four subunits arranged in a square.

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Characteristic Geometry and Diffraction Contrast of Dispersed ThO2 Crystals

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100062750 ◽

1969 ◽

Vol 27 ◽

pp. 168-169

Author(s):

R. J. Horylev ◽

L. E. Murr

Keyword(s):

Dark Field ◽

Particle Orientation ◽

Contrast Effects ◽

Strain Fields ◽

Diffraction Contrast ◽

Dispersed Particles ◽

Field Electron Microscopy ◽

Dark Field Electron ◽

Particle Images ◽

Diffraction Effects

Smith has shown by dark-field electron microscopy of extracted ThO2 particles from TD-nickel (2% ThO2) that they possess single crystal characteristics. It is generally assumed that these particle dispersions are incoherent. However, some diffraction effects associated with the particle images appeared to be similar to coherency strain fields. The present work will demonstrate conclusively that ThO2 dispersed particles in TD-nickel (2% ThO2) and TD-NiCr (2% ThO2, 20% Cr, Ni) are single crystals. Moreover, the diffraction contrast effects are extinction fringes. That is, these effects arise because of the particle orientation with respect to the electron beam and the extinction conditions for various operating reflections The particles are in fact incoherent.

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Structural and functional properties of Escherichia coli-derived nucleoplasmin A comparative study of recombinant and natural proteins

European Journal of Biochemistry ◽

10.1046/j.1432-1033.2001.02043.x ◽

2001 ◽

Vol 268 (6) ◽

pp. 1739-1748

Author(s):

Aitor Hierro ◽

Jesus M. Arizmendi ◽

Javier De Las Rivas ◽

M. Angeles Urbaneja ◽

Adelina Prado ◽

...

Keyword(s):

Escherichia Coli ◽

Comparative Study ◽

Functional Properties ◽

Structural And Functional Properties

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Functional Properties of Cloned Allergens from Dust Mite, Cockroach, and Cat

Allergy & Clinical Immunology International - Journal of the World Allergy Organization ◽

10.1027/0838-1925.13.4.162 ◽

2001 ◽

Vol 13 (4) ◽

pp. 0162-0169 ◽

Cited By ~ 7

Author(s):

Anna Pomés ◽

Alisa Smith ◽

Christophe Grégoire ◽

Lisa Vailes ◽

L. Arruda ◽

...

Keyword(s):

Functional Properties ◽

Dust Mite

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Surface treatment with silver particles isles on Titanium cp: study of antimicrobial activity

Research Society and Development ◽

10.33448/rsd-v9i4.2662 ◽

2020 ◽

Vol 9 (4) ◽

pp. e27942662

Author(s):

Patrícia Capellato ◽

Cláudia Eliana Bruno Marino ◽

Gilbert Silva ◽

Lucas Victor Benjamim Vasconcelos ◽

Rodrigo Perito Cardoso ◽

...

Keyword(s):

Antimicrobial Activity ◽

Surface Treatment ◽

Titanium Surface ◽

Silver Clusters ◽

Silver Particles ◽

Silver Deposition ◽

Dispersed Particles ◽

Significant Difference ◽

Diffusion Assay ◽

Antibacterial Potential

During the last decades, researchers have been growing the interest in surface treatment with an antimicrobial agent. Silver nanoparticles (AgNPs) are widely used in biomedical fields due to their potent antimicrobial activity. So, in this study was investigated silver particles (isles) coated on titanium surface for dental and orthopedic application. Silver particles coating process on titanium surface were performed via sputtering that is a plasma-assisted deposition technique with and titanium without treatment was applied as comparing standard. Plasma treatment parameters were optimized so that the result was not a thin film of Ag but dispersed particles of Ag on the Ti-cp surface. The alloy surfaces were investigated using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). In order to investigate antibacterial potential Staphylococcus aureus and Escherichia coli have been used at Agar diffusion assay. The results were analyzed by analysis of variance (ANOVA) in order to verify significant difference antimicrobial activity between samples that have shown no difference between the surfaces studied treatments. For silver deposition scattered particles (isles) over titanium surface for a 10-minute treatment, EDS revealed by silver clusters that the particles were not properly scattered onto surface, hence, the low effectiveness in antibacterial activity.

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